svn merge -r550:HEAD "^/branches/released" .

1 files changed, 2460 insertions, 2439 deletions

diff --git a/xorg-server/hw/xwin/glx/indirect.c b/xorg-server/hw/xwin/glx/indirect.c
index 7247992dc..098973ca3 100644
--- a/xorg-server/hw/xwin/glx/indirect.c
+++ b/xorg-server/hw/xwin/glx/indirect.c
@@ -1,2439 +1,2460 @@
-/*

- * File: indirect.c

- * Purpose: A GLX implementation that uses Windows OpenGL library

- *

- * Authors: Alexander Gottwald

- *          Jon TURNEY

- *

- * Copyright (c) Jon TURNEY 2009

- * Copyright (c) Alexander Gottwald 2004

- *

- * Portions of this file are copied from GL/apple/indirect.c,

- * which contains the following copyright:

- *

- * Copyright (c) 2007, 2008, 2009 Apple Inc.

- * Copyright (c) 2004 Torrey T. Lyons. All Rights Reserved.

- * Copyright (c) 2002 Greg Parker. All Rights Reserved.

- *

- * Portions of this file are copied from Mesa's xf86glx.c,

- * which contains the following copyright:

- *

- * Copyright 1998-1999 Precision Insight, Inc., Cedar Park, Texas.

- * All Rights Reserved.

- *

- *

- * Permission is hereby granted, free of charge, to any person obtaining a

- * copy of this software and associated documentation files (the "Software"),

- * to deal in the Software without restriction, including without limitation

- * the rights to use, copy, modify, merge, publish, distribute, sublicense,

- * and/or sell copies of the Software, and to permit persons to whom the

- * Software is furnished to do so, subject to the following conditions:

- *

- * The above copyright notice and this permission notice shall be included in

- * all copies or substantial portions of the Software.

- *

- * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR

- * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,

- * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL

- * THE ABOVE LISTED COPYRIGHT HOLDER(S) BE LIABLE FOR ANY CLAIM, DAMAGES OR

- * OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,

- * ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER

- * DEALINGS IN THE SOFTWARE.

- */

-

-/*

-  TODO:

-  - hook up remaining unimplemented extensions

-  - research what guarantees glXWaitX, glXWaitGL are supposed to offer, and implement then

-    using GdiFlush and/or glFinish

-  - pbuffer clobbering: we don't get async notification, but can we arrange to emit the

-    event when we notice it's been clobbered? at the very least, check if it's been clobbered

-    before using it?

-  - are the __GLXConfig * we get handed back ones we are made (so we can extend the structure

-    with privates?) Or are they created inside the GLX core as well?

-  - snap winWindowInfoRec, it's just the same as a HWND now...

-*/

-

-/*

-  MSDN clarifications:

-

-  It says SetPixelFormat()'s PIXELFORMATDESCRIPTOR pointer argument has no effect

-  except on metafiles, this seems to mean that as it's ok to supply NULL if the DC

-  is not for a metafile

-

-  wglMakeCurrent ignores the hdc if hglrc is NULL, so wglMakeCurrent(NULL, NULL)

-  is used to make no context current

-

-*/

-

-#ifdef HAVE_XWIN_CONFIG_H

-#include <xwin-config.h>

-#endif

-

-#include "glwindows.h"

-#include <glx/glxserver.h>

-#include <glx/glxutil.h>

-#include <glx/extension_string.h>

-#include <GL/internal/glcore.h>

-#include <GL/glxtokens.h>

-

-#include <winpriv.h>

-#include <wgl_ext_api.h>

-#include "win.h"

-#include <winmsg.h>

-

-extern Bool			g_fXdmcpEnabled;

-extern Bool g_fNativeGl;

-

-#define NUM_ELEMENTS(x) (sizeof(x)/ sizeof(x[1]))

-

-/* ---------------------------------------------------------------------- */

-/*

- *   structure definitions

- */

-

-typedef struct __GLXWinContext  __GLXWinContext;

-typedef struct __GLXWinDrawable __GLXWinDrawable;

-typedef struct __GLXWinScreen glxWinScreen;

-typedef struct __GLXWinConfig GLXWinConfig;

-

-struct __GLXWinContext {

-  __GLXcontext base;

-  HGLRC ctx;                         /* Windows GL Context */

-  HDC hDC;                           /* Windows device context */

-  HDC hreadDC;                     /* Windows device read context */

-  __GLXWinContext *shareContext;     /* Context with which we will share display lists and textures */

-  HWND hwnd;                         /* For detecting when HWND has changed */

-  HWND hreadwnd;

-};

-

-struct __GLXWinDrawable

-{

-  __GLXdrawable base;

-  __GLXWinContext *drawContext;

-

-  /* If this drawable is GLX_DRAWABLE_PBUFFER */

-  HPBUFFERARB hPbuffer;

-

-  /* If this drawable is GLX_DRAWABLE_PIXMAP */

-  HDC dibDC;

-  HBITMAP hDIB;

-  HBITMAP hOldDIB; /* original DIB for DC */

-  void *pOldBits; /* original pBits for this drawable's pixmap */

-};

-

-struct __GLXWinScreen

-{

-  __GLXscreen base;

-

-  /* Supported GLX extensions */

-  unsigned char glx_enable_bits[__GLX_EXT_BYTES];

-

-  Bool has_WGL_ARB_multisample;

-  Bool has_WGL_ARB_pixel_format;

-  Bool has_WGL_ARB_pbuffer;

-  Bool has_WGL_ARB_render_texture;

-

-  /* wrapped screen functions */

-  RealizeWindowProcPtr RealizeWindow;

-  UnrealizeWindowProcPtr UnrealizeWindow;

-  DestroyWindowProcPtr DestroyWindow;

-  CopyWindowProcPtr CopyWindow;

-  PositionWindowProcPtr PositionWindow;

-};

-

-struct __GLXWinConfig

-{

-  __GLXconfig base;

-  int pixelFormatIndex;

-};

-

-/* ---------------------------------------------------------------------- */

-/*

- * Various debug helpers

- */

-

-#ifdef _DEBUG

-void GLWIN_DEBUG_HWND(HWND hwnd)

-{

-  if (glxWinDebugSettings.dumpHWND)

-  {

-    char buffer[1024];

-    RECT Rect;

-    HDC hDc=GetDC(hwnd);

-

-    if (GetWindowText(hwnd, buffer, sizeof(buffer))==0) *buffer=0;

-    GetWindowRect(hwnd,&Rect);

-

-    GLWIN_DEBUG_MSG("Got HWND %p (hdc %p) for window '%s' (%d,%d,%d,%d)", hwnd, hDc, buffer, Rect.left, Rect.top, Rect.right, Rect.bottom);

-    ReleaseDC(hwnd,hDc);

-  }

-}

-

-void GLWIN_HDC_DEBUG_MSG(const char *Message, HDC hDc, HWND hwnd)

-{

-    char buffer[1024];

-    RECT Rect;

-

-    if (GetWindowText(hwnd, buffer, sizeof(buffer))==0) *buffer=0;

-    GetWindowRect(hwnd,&Rect);

-

-    GLWIN_DEBUG_MSG("Got HDC %p (hwnd %p) for window '%s' (%d,%d,%d,%d)", hDc, hwnd, buffer, Rect.left, Rect.top, Rect.right, Rect.bottom);

-

-}

-

-glxWinDebugSettingsRec glxWinDebugSettings = { 0, 0, 0, 0, 0, 0};

-

-static void glxWinInitDebugSettings(void)

-{

-    char *envptr;

-

-    envptr = getenv("GLWIN_ENABLE_DEBUG");

-    if (envptr != NULL)

-        glxWinDebugSettings.enableDebug = (atoi(envptr) == 1);

-

-    envptr = getenv("GLWIN_ENABLE_TRACE");

-    if (envptr != NULL)

-        glxWinDebugSettings.enableTrace = (atoi(envptr) == 1);

-

-    envptr = getenv("GLWIN_DUMP_PFD");

-    if (envptr != NULL)

-        glxWinDebugSettings.dumpPFD = (atoi(envptr) == 1);

-

-    envptr = getenv("GLWIN_DUMP_HWND");

-    if (envptr != NULL)

-        glxWinDebugSettings.dumpHWND = (atoi(envptr) == 1);

-

-    envptr = getenv("GLWIN_DUMP_DC");

-    if (envptr != NULL)

-        glxWinDebugSettings.dumpDC = (atoi(envptr) == 1);

-

-    envptr = getenv("GLWIN_ENABLE_GLCALL_TRACE");

-    if (envptr != NULL)

-        glxWinDebugSettings.enableGLcallTrace = (atoi(envptr) == 1);

-

-    envptr = getenv("GLWIN_ENABLE_WGLCALL_TRACE");

-    if (envptr != NULL)

-        glxWinDebugSettings.enableWGLcallTrace = (atoi(envptr) == 1);

-

-    envptr = getenv("GLWIN_DEBUG_ALL");

-    if (envptr != NULL)

-      {

-        glxWinDebugSettings.enableDebug = 1;

-        glxWinDebugSettings.enableTrace = 1;

-        glxWinDebugSettings.dumpPFD = 1;

-        glxWinDebugSettings.dumpHWND = 1;

-        glxWinDebugSettings.dumpDC = 1;

-        glxWinDebugSettings.enableGLcallTrace = 1;

-        glxWinDebugSettings.enableWGLcallTrace = 1;

-      }

-}

-#endif

-

-static

-const char *glxWinErrorMessage(void)

-{

-  static char errorbuffer[1024];

-  DWORD Error=GetLastError();

-  int offset;

-  

-  sprintf(errorbuffer, "%p ",Error);

-  offset=strlen(errorbuffer);

-

-  if (!FormatMessage(

-                     FORMAT_MESSAGE_FROM_SYSTEM | FORMAT_MESSAGE_IGNORE_INSERTS,

-                     NULL,

-                     Error,

-                     MAKELANGID(LANG_NEUTRAL, SUBLANG_DEFAULT),

-                     (LPTSTR) &errorbuffer[offset],

-                     sizeof(errorbuffer),

-                     NULL ))

-    {

-      snprintf(errorbuffer, sizeof(errorbuffer), "Unknown error in FormatMessage: %08x!", (unsigned)GetLastError());

-    }

-

-  if (errorbuffer[strlen(errorbuffer)-1] == '\n')

-    errorbuffer[strlen(errorbuffer)-1] = 0;

-

-  return errorbuffer;

-}

-

-static void pfdOut(const PIXELFORMATDESCRIPTOR *pfd);

-

-#ifdef _DEBUG

-

-#define DUMP_PFD_FLAG(flag) \

-    if (pfd->dwFlags & flag) { \

-        ErrorF("%s%s", pipesym, #flag); \

-        pipesym = " | "; \

-    }

-

-static void pfdOut(const PIXELFORMATDESCRIPTOR *pfd)

-{

-    const char *pipesym = ""; /* will be set after first flag dump */

-    ErrorF("PIXELFORMATDESCRIPTOR:\n");

-    ErrorF("nSize = %u\n", pfd->nSize);

-    ErrorF("nVersion = %u\n", pfd->nVersion);

-    ErrorF("dwFlags = %lu = {", pfd->dwFlags);

-        DUMP_PFD_FLAG(PFD_DOUBLEBUFFER);

-        DUMP_PFD_FLAG(PFD_STEREO);

-        DUMP_PFD_FLAG(PFD_DRAW_TO_WINDOW);

-        DUMP_PFD_FLAG(PFD_DRAW_TO_BITMAP);

-        DUMP_PFD_FLAG(PFD_SUPPORT_GDI);

-        DUMP_PFD_FLAG(PFD_SUPPORT_OPENGL);

-        DUMP_PFD_FLAG(PFD_GENERIC_FORMAT);

-        DUMP_PFD_FLAG(PFD_NEED_PALETTE);

-        DUMP_PFD_FLAG(PFD_NEED_SYSTEM_PALETTE);

-        DUMP_PFD_FLAG(PFD_SWAP_EXCHANGE);

-        DUMP_PFD_FLAG(PFD_SWAP_COPY);

-        DUMP_PFD_FLAG(PFD_SWAP_LAYER_BUFFERS);

-        DUMP_PFD_FLAG(PFD_GENERIC_ACCELERATED);

-        DUMP_PFD_FLAG(PFD_DEPTH_DONTCARE);

-        DUMP_PFD_FLAG(PFD_DOUBLEBUFFER_DONTCARE);

-        DUMP_PFD_FLAG(PFD_STEREO_DONTCARE);

-    ErrorF("}\n");

-

-    ErrorF("iPixelType = %hu = %s\n", pfd->iPixelType,

-            (pfd->iPixelType == PFD_TYPE_RGBA ? "PFD_TYPE_RGBA" : "PFD_TYPE_COLORINDEX"));

-    ErrorF("cColorBits = %hhu\n", pfd->cColorBits);

-    ErrorF("cRedBits = %hhu\n", pfd->cRedBits);

-    ErrorF("cRedShift = %hhu\n", pfd->cRedShift);

-    ErrorF("cGreenBits = %hhu\n", pfd->cGreenBits);

-    ErrorF("cGreenShift = %hhu\n", pfd->cGreenShift);

-    ErrorF("cBlueBits = %hhu\n", pfd->cBlueBits);

-    ErrorF("cBlueShift = %hhu\n", pfd->cBlueShift);

-    ErrorF("cAlphaBits = %hhu\n", pfd->cAlphaBits);

-    ErrorF("cAlphaShift = %hhu\n", pfd->cAlphaShift);

-    ErrorF("cAccumBits = %hhu\n", pfd->cAccumBits);

-    ErrorF("cAccumRedBits = %hhu\n", pfd->cAccumRedBits);

-    ErrorF("cAccumGreenBits = %hhu\n", pfd->cAccumGreenBits);

-    ErrorF("cAccumBlueBits = %hhu\n", pfd->cAccumBlueBits);

-    ErrorF("cAccumAlphaBits = %hhu\n", pfd->cAccumAlphaBits);

-    ErrorF("cDepthBits = %hhu\n", pfd->cDepthBits);

-    ErrorF("cStencilBits = %hhu\n", pfd->cStencilBits);

-    ErrorF("cAuxBuffers = %hhu\n", pfd->cAuxBuffers);

-    ErrorF("iLayerType = %hhu\n", pfd->iLayerType);

-    ErrorF("bReserved = %hhu\n", pfd->bReserved);

-    ErrorF("dwLayerMask = %lu\n", pfd->dwLayerMask);

-    ErrorF("dwVisibleMask = %lu\n", pfd->dwVisibleMask);

-    ErrorF("dwDamageMask = %lu\n", pfd->dwDamageMask);

-    ErrorF("\n");

-}

-

-static const char *

-visual_class_name(int cls)

-{

-  switch (cls) {

-  case GLX_STATIC_COLOR:

-    return "StaticColor";

-  case GLX_PSEUDO_COLOR:

-    return "PseudoColor";

-  case GLX_STATIC_GRAY:

-    return "StaticGray";

-  case GLX_GRAY_SCALE:

-    return "GrayScale";

-  case GLX_TRUE_COLOR:

-     return "TrueColor";

-  case GLX_DIRECT_COLOR:

-     return "DirectColor";

-  default:

-    return "-none-";

-  }

-}

-

-static const char *

-swap_method_name(int mthd)

-{

-  switch (mthd)

-    {

-    case GLX_SWAP_EXCHANGE_OML:

-      return "xchg";

-    case GLX_SWAP_COPY_OML:

-      return "copy";

-    case GLX_SWAP_UNDEFINED_OML:

-      return "    ";

-    default:

-      return "????";

-    }

-}

-

-static void

-fbConfigsDump(unsigned int n, __GLXconfig *c)

-{

-  ErrorF("%d fbConfigs\n", n);

-  ErrorF("pxf vis  fb                      render         Ste                     aux    accum        MS    drawable             Group/\n");

-  ErrorF("idx  ID  ID VisualType Depth Lvl RGB CI DB Swap reo  R  G  B  A   Z  S  buf AR AG AB AA  bufs num  W P Pb  Float Trans Caveat\n");

-  ErrorF("-----------------------------------------------------------------------------------------------------------------------------\n");

-

-  while (c != NULL)

-    {

-      unsigned int i = ((GLXWinConfig *)c)->pixelFormatIndex;

-

-      ErrorF("%3d  %2x  %2x "

-             "%-11s"

-             " %3d %3d   %s   %s  %s %s  %s  "

-             "%2d %2d %2d %2d  "

-             "%2d %2d  "

-             "%2d  "

-             "%2d %2d %2d %2d"

-             "   %2d   %2d"

-             "  %s %s %s "

-             "    %s   "

-             "  %s   "

-             "  %d %s"

-             "\n",

-             i, c->visualID, c->fbconfigID,

-             visual_class_name(c->visualType),

-             c->rgbBits ? c->rgbBits : c->indexBits,

-             c->level,

-	     (c->renderType & GLX_RGBA_BIT) ? "y" : ".",

-	     (c->renderType & GLX_COLOR_INDEX_BIT) ? "y" : ".",

-	     c->doubleBufferMode ? "y" : ".",

-             swap_method_name(c->swapMethod),

-	     c->stereoMode ? "y" : ".",

-             c->redBits, c->greenBits, c->blueBits, c->alphaBits,

-             c->depthBits, c->stencilBits,

-             c->numAuxBuffers,

-             c->accumRedBits, c->accumGreenBits, c->accumBlueBits, c->accumAlphaBits,

-             c->sampleBuffers, c->samples,

-             (c->drawableType & GLX_WINDOW_BIT) ? "y" : ".",

-             (c->drawableType & GLX_PIXMAP_BIT) ? "y" : ".",

-             (c->drawableType & GLX_PBUFFER_BIT) ? "y" : ".",

-             ".",

-             (c->transparentPixel != GLX_NONE_EXT) ? "y" : ".",

-             c->visualSelectGroup, (c->visualRating == GLX_SLOW_VISUAL_EXT) ? "*" : " ");

-

-      c = c->next;

-    }

-}

-#endif

-

-/* ---------------------------------------------------------------------- */

-/*

- * Forward declarations

- */

-

-static __GLXscreen *glxWinScreenProbe(ScreenPtr pScreen);

-static __GLXcontext *glxWinCreateContext(__GLXscreen *screen,

-                                        __GLXconfig *modes,

-                                        __GLXcontext *baseShareContext);

-static __GLXdrawable *glxWinCreateDrawable(__GLXscreen *screen,

-                                          DrawablePtr pDraw,

-                                          int type,

-                                          XID drawId,

-                                          __GLXconfig *conf);

-

-static Bool glxWinRealizeWindow(WindowPtr pWin);

-static Bool glxWinUnrealizeWindow(WindowPtr pWin);

-static Bool glxWinDestroyWindow(WindowPtr pWin);

-static void glxWinCopyWindow(WindowPtr pWindow, DDXPointRec ptOldOrg, RegionPtr prgnSrc);

-static Bool glxWinPositionWindow(WindowPtr pWindow, int x, int y);

-

-static HDC glxWinMakeDC(__GLXWinContext *gc, __GLXWinDrawable *draw, HWND *hwnd);

-static void glxWinReleaseDC(HWND hwnd, HDC hdc, __GLXWinDrawable *draw);

-

-static void glxWinCreateConfigs(HDC dc, glxWinScreen *screen);

-static void glxWinCreateConfigsExt(HDC hdc, glxWinScreen *screen);

-static int fbConfigToPixelFormat(__GLXconfig *mode, PIXELFORMATDESCRIPTOR *pfdret, int drawableTypeOverride);

-static int fbConfigToPixelFormatIndex(HDC hdc, __GLXconfig *mode, int drawableTypeOverride, glxWinScreen *winScreen);

-

-/* ---------------------------------------------------------------------- */

-/*

- * The GLX provider

- */

-

-__GLXprovider __glXWGLProvider = {

-    glxWinScreenProbe,

-    "Win32 native WGL",

-    NULL

-};

-

-void

-glxWinPushNativeProvider(void)

-{

-  if (g_fNativeGl)

-    GlxPushProvider(&__glXWGLProvider);

-}

-

-/* ---------------------------------------------------------------------- */

-/*

- * Screen functions

- */

-

-static void

-glxWinScreenDestroy(__GLXscreen *screen)

-{

-    GLWIN_DEBUG_MSG("glxWinScreenDestroy(%p)", screen);

-    __glXScreenDestroy(screen);

-    xfree(screen);

-}

-

-static int

-glxWinScreenSwapInterval(__GLXdrawable *drawable, int interval)

-{

-  BOOL ret = wglSwapIntervalEXTWrapper(interval);

-  if (!ret)

-    {

-      ErrorF("wglSwapIntervalEXT interval %d failed:%s\n", interval, glxWinErrorMessage());

-    }

-  return ret;

-}

-

-static LRESULT CALLBACK GlxWindowProc(HWND hwnd, UINT uMsg, WPARAM wParam, LPARAM lParam)

-{

-  if (uMsg== WM_NCHITTEST)

-  {

-    return HTTRANSPARENT;

-  }

-  else

-    return DefWindowProc(hwnd, uMsg, wParam, lParam);

-}

-

-/*

-  Report the extensions split and formatted to avoid overflowing a line

- */

-static void

-glxLogExtensions(const char *prefix, const char *extensions)

-{

-  int length = 0;

-  char *strl;

-  char *str = xalloc(strlen(extensions) + 1);

-

-  if (str == NULL)

-    {

-      ErrorF("glxLogExtensions: xalloc error\n");

-      return;

-    }

-

-  str[strlen(extensions)] = '\0';

-  strncpy (str, extensions, strlen(extensions));

-

-  strl = strtok(str, " ");

-  winDebug("%s%s", prefix, strl);

-  length = strlen(prefix) + strlen(strl);

-

-  while (1)

-    {

-      strl = strtok(NULL, " ");

-      if (strl == NULL) break;

-

-      if (length + strlen(strl) + 1 > 120)

-        {

-          winDebug("\n%s",prefix);

-          length = strlen(prefix);

-        }

-      else

-        {

-          winDebug(" ");

-          length++;

-        }

-

-      winDebug("%s", strl);

-      length = length + strlen(strl);

-    }

-

-  winDebug("\n");

-

-  xfree(str);

-}

-

-/* This is called by GlxExtensionInit() asking the GLX provider if it can handle the screen... */

-static __GLXscreen *

-glxWinScreenProbe(ScreenPtr pScreen)

-{

-    glxWinScreen *screen;

-    const char *gl_extensions;

-    const char *wgl_extensions;

-    HWND hwnd;

-    HDC hdc;

-    HGLRC hglrc;

-

-    GLWIN_DEBUG_MSG("glxWinScreenProbe");

-

-#ifdef _DEBUG

-    glxWinInitDebugSettings();

-#endif

-

-    if (pScreen == NULL)

-	return NULL;

-

-    if (!winCheckScreenAiglxIsSupported(pScreen))

-      {

-        LogMessage(X_ERROR,"AIGLX: No native OpenGL in modes with a root window\n");

-        return NULL;

-      }

-

-    screen = xcalloc(1, sizeof(glxWinScreen));

-

-    if (NULL == screen)

-	return NULL;

-

-    /* Wrap RealizeWindow, UnrealizeWindow and CopyWindow on this screen */

-    screen->RealizeWindow = pScreen->RealizeWindow;

-    pScreen->RealizeWindow = glxWinRealizeWindow;

-    screen->UnrealizeWindow = pScreen->UnrealizeWindow;

-    pScreen->UnrealizeWindow = glxWinUnrealizeWindow;

-    screen->CopyWindow = pScreen->CopyWindow;

-    pScreen->CopyWindow = glxWinCopyWindow;

-    screen->PositionWindow = pScreen->PositionWindow;

-    pScreen->PositionWindow = glxWinPositionWindow;

-    screen->DestroyWindow = pScreen->DestroyWindow;

-    pScreen->DestroyWindow = glxWinDestroyWindow;

-

-    /* Dump out some useful information about the native renderer */

-

-    // create window class

-    {

-      static wATOM glTestWndClass = 0;

-      if (glTestWndClass == 0)

-        {

-          WNDCLASSEX wc;

-          glTestWndClass=1;

-          wc.cbSize = sizeof(WNDCLASSEX);

-          wc.style = CS_OWNDC ;

-          wc.lpfnWndProc = GlxWindowProc;

-          wc.cbClsExtra = 0;

-          wc.cbWndExtra = 0;

-          wc.hInstance = GetModuleHandle(NULL);

-          wc.hIcon = 0;

-          wc.hCursor = 0;

-          wc.hbrBackground = 0;

-          wc.lpszMenuName = NULL;

-          wc.lpszClassName = WIN_GL_WINDOW_CLASS;

-          wc.hIconSm = 0;

-          RegisterClassEx (&wc);

-      }

-    }

-

-    // create an invisible window for a scratch DC

-    hwnd = CreateWindowExA(0,

-                           WIN_GL_WINDOW_CLASS,

-                           "XWin GL Renderer Capabilities Test Window",

-                           0, 0, 0, 0, 0, NULL, NULL, GetModuleHandle(NULL), NULL);

-    if (hwnd == NULL)

-      LogMessage(X_ERROR,"AIGLX: Couldn't create a window for render capabilities testing\n");

-

-    hdc = GetDC(hwnd);

-

-    // we must set a pixel format before we can create a context, just use the first one...

-    SetPixelFormat(hdc, 1, NULL);

-    hglrc = wglCreateContext(hdc);

-    wglMakeCurrent(hdc, hglrc);

-

-    // initialize wgl extension proc pointers (don't call them before here...)

-    // (but we need to have a current context for them to be resolvable)

-    wglResolveExtensionProcs();

-

-    winDebug("GL_VERSION:     %s\n", glGetStringWrapperNonstatic(GL_VERSION));

-    winDebug("GL_VENDOR:      %s\n", glGetStringWrapperNonstatic(GL_VENDOR));

-    winDebug("GL_RENDERER:    %s\n", glGetStringWrapperNonstatic(GL_RENDERER));

-    gl_extensions = (const char *)glGetStringWrapperNonstatic(GL_EXTENSIONS);

-    glxLogExtensions("GL_EXTENSIONS:  ", gl_extensions);

-    wgl_extensions = wglGetExtensionsStringARBWrapper(hdc);

-    if (!wgl_extensions) wgl_extensions = "";

-    glxLogExtensions("WGL_EXTENSIONS: ", wgl_extensions);

-

-    // Can you see the problem here?  The extensions string is DC specific

-    // Different DCs for windows on a multimonitor system driven by multiple cards

-    // might have completely different capabilities.  Of course, good luck getting

-    // those screens to be accelerated in XP and earlier...

-

-    {

-      // testing facility to not use any WGL extensions

-      char *envptr = getenv("GLWIN_NO_WGL_EXTENSIONS");

-      if ((envptr != NULL) && (atoi(envptr) != 0))

-        {

-          ErrorF("GLWIN_NO_WGL_EXTENSIONS is set, ignoring WGL_EXTENSIONS\n");

-          wgl_extensions = "";

-        }

-    }

-

-    {

-      Bool glx_sgi_make_current_read = FALSE;

-

-      //

-      // Based on the WGL extensions available, enable various GLX extensions

-      // XXX: make this table-driven ?

-      //

-      memset(screen->glx_enable_bits, 0, __GLX_EXT_BYTES);

-

-      __glXEnableExtension(screen->glx_enable_bits, "GLX_EXT_visual_info");

-      __glXEnableExtension(screen->glx_enable_bits, "GLX_EXT_visual_rating");

-      __glXEnableExtension(screen->glx_enable_bits, "GLX_EXT_import_context");

-      __glXEnableExtension(screen->glx_enable_bits, "GLX_OML_swap_method");

-      __glXEnableExtension(screen->glx_enable_bits, "GLX_SGIX_fbconfig");

-

-      if (strstr(wgl_extensions, "WGL_ARB_make_current_read"))

-        {

-          __glXEnableExtension(screen->glx_enable_bits, "GLX_SGI_make_current_read");

-          LogMessage(X_INFO, "AIGLX: enabled GLX_SGI_make_current_read\n");

-          glx_sgi_make_current_read = TRUE;

-        }

-

-      if (strstr(gl_extensions, "GL_WIN_swap_hint"))

-        {

-          __glXEnableExtension(screen->glx_enable_bits, "GLX_MESA_copy_sub_buffer");

-          LogMessage(X_INFO, "AIGLX: enabled GLX_MESA_copy_sub_buffer\n");

-        }

-

-      if (strstr(wgl_extensions, "WGL_EXT_swap_control"))

-        {

-          __glXEnableExtension(screen->glx_enable_bits, "GLX_SGI_swap_control");

-          __glXEnableExtension(screen->glx_enable_bits, "GLX_MESA_swap_control");

-          LogMessage(X_INFO, "AIGLX: enabled GLX_SGI_swap_control and GLX_MESA_swap_control\n");

-        }

-

-/*       // Hmm?  screen->texOffset */

-/*       if (strstr(wgl_extensions, "WGL_ARB_render_texture")) */

-/*         { */

-/*           __glXEnableExtension(screen->glx_enable_bits, "GLX_EXT_texture_from_pixmap"); */

-/*           LogMessage(X_INFO, "AIGLX: GLX_EXT_texture_from_pixmap backed by buffer objects\n"); */

-/*           screen->has_WGL_ARB_render_texture = TRUE; */

-/*         } */

-

-      if (strstr(wgl_extensions, "WGL_ARB_pbuffer"))

-        {

-          __glXEnableExtension(screen->glx_enable_bits, "GLX_SGIX_pbuffer");

-          LogMessage(X_INFO, "AIGLX: enabled GLX_SGIX_pbuffer\n");

-          screen->has_WGL_ARB_pbuffer = TRUE;

-        }

-

-      if (strstr(wgl_extensions, "WGL_ARB_multisample"))

-        {

-          __glXEnableExtension(screen->glx_enable_bits, "GLX_ARB_multisample");

-          __glXEnableExtension(screen->glx_enable_bits, "GLX_SGIS_multisample");

-          LogMessage(X_INFO, "AIGLX: enabled GLX_ARB_multisample and GLX_SGIS_multisample\n");

-          screen->has_WGL_ARB_multisample = TRUE;

-        }

-

-      screen->base.destroy = glxWinScreenDestroy;

-      screen->base.createContext = glxWinCreateContext;

-      screen->base.createDrawable = glxWinCreateDrawable;

-      screen->base.swapInterval = glxWinScreenSwapInterval;

-      screen->base.hyperpipeFuncs = NULL;

-      screen->base.swapBarrierFuncs = NULL;

-      screen->base.pScreen = pScreen;

-

-      if (strstr(wgl_extensions, "WGL_ARB_pixel_format"))

-        {

-          glxWinCreateConfigsExt(hdc, screen);

-          screen->has_WGL_ARB_pixel_format = TRUE;

-        }

-      else

-        {

-          glxWinCreateConfigs(hdc, screen);

-          screen->has_WGL_ARB_pixel_format = FALSE;

-        }

-      // Initializes screen->base.fbconfigs and screen->base.numFBConfigs

-

-      /* These will be set by __glXScreenInit */

-      screen->base.visuals = NULL;

-      screen->base.numVisuals = 0;

-

-      __glXScreenInit(&screen->base, pScreen);

-

-#ifdef _DEBUG

-      // dump out fbConfigs now fbConfigIds and visualIDs have been assigned

-      fbConfigsDump(screen->base.numFBConfigs, screen->base.fbconfigs);

-#endif

-

-      // Override the GL extensions string set by __glXScreenInit()

-      screen->base.GLextensions = xstrdup(gl_extensions);

-

-      // Generate the GLX extensions string (overrides that set by __glXScreenInit())

-      {

-        unsigned int buffer_size = __glXGetExtensionString(screen->glx_enable_bits, NULL);

-        if (buffer_size > 0)

-          {

-            if (screen->base.GLXextensions != NULL)

-              {

-                xfree(screen->base.GLXextensions);

-              }

-

-            screen->base.GLXextensions = xnfalloc(buffer_size);

-            __glXGetExtensionString(screen->glx_enable_bits, screen->base.GLXextensions);

-          }

-      }

-

-      //

-      // Override the GLX version (__glXScreenInit() sets it to "1.2")

-      // if we have all the needed extensionsto operate as a higher version

-      //

-      // SGIX_fbconfig && SGIX_pbuffer && SGI_make_current_read -> 1.3

-      // ARB_multisample -> 1.4

-      //

-      if (screen->has_WGL_ARB_pbuffer && glx_sgi_make_current_read)

-        {

-          xfree(screen->base.GLXversion);

-

-          if (screen->has_WGL_ARB_multisample)

-            {

-              screen->base.GLXversion = xstrdup("1.4");

-              screen->base.GLXmajor = 1;

-              screen->base.GLXminor = 4;

-            }

-          else

-            {

-              screen->base.GLXversion = xstrdup("1.3");

-              screen->base.GLXmajor = 1;

-              screen->base.GLXminor = 3;

-            }

-          LogMessage(X_INFO, "AIGLX: Set GLX version to %s\n", screen->base.GLXversion);

-        }

-    }

-

-    wglMakeCurrent(NULL, NULL);

-    wglDeleteContext(hglrc);

-    ReleaseDC(hwnd, hdc);

-    DestroyWindow(hwnd);

-

-    return &screen->base;

-}

-

-/* ---------------------------------------------------------------------- */

-/*

- * Window functions

- */

-

-static Bool

-glxWinRealizeWindow(WindowPtr pWin)

-{

-    Bool result;

-    ScreenPtr pScreen = pWin->drawable.pScreen;

-    glxWinScreen *screenPriv = (glxWinScreen *) glxGetScreen(pScreen);

-    winWindowPriv(pWin);

-

-    GLWIN_DEBUG_MSG("glxWinRealizeWindow");

-

-    /* Allow the window to be created (RootlessRealizeWindow is inside our wrap) */

-    pScreen->RealizeWindow = screenPriv->RealizeWindow;

-    result = pScreen->RealizeWindow(pWin);

-    pScreen->RealizeWindow = glxWinRealizeWindow;

-    

-    // Check if ze need to move the window\n

-    if (pWinPriv->GlCtxWnd && pWinPriv->hWnd)

-    {

-       ShowWindow(pWinPriv->hWnd,SW_SHOW);

-    }

-    return result;

-}

-

-

-static void

-glxWinCopyWindow(WindowPtr pWindow, DDXPointRec ptOldOrg, RegionPtr prgnSrc)

-{

-    __GLXWinDrawable *pGlxDraw;

-    ScreenPtr pScreen = pWindow->drawable.pScreen;

-    glxWinScreen *screenPriv = (glxWinScreen *) glxGetScreen(pScreen);

-

-    GLWIN_TRACE_MSG("glxWinCopyWindow pWindow %p", pWindow);

-

-    dixLookupResourceByType((pointer) &pGlxDraw, pWindow->drawable.id, __glXDrawableRes,

-				NullClient, DixUnknownAccess);

-

-

-    /*

-       Discard any CopyWindow requests if a GL drawing context is pointing at the window

-

-       For regions which are being drawn by GL, the shadow framebuffer doesn't have the

-       correct bits, so we wish to avoid shadow framebuffer damage occuring, which will

-       cause those incorrect bits to be transferred to the display....

-    */

-    if (pGlxDraw && pGlxDraw->drawContext)

-      {

-        GLWIN_DEBUG_MSG("glxWinCopyWindow: discarding");

-        return;

-      }

-

-    GLWIN_DEBUG_MSG("glxWinCopyWindow - passing to hw layer");

-

-    pScreen->CopyWindow = screenPriv->CopyWindow;

-    pScreen->CopyWindow(pWindow, ptOldOrg, prgnSrc);

-    pScreen->CopyWindow = glxWinCopyWindow;

-

-}

-

-static Bool

-glxWinPositionWindow(WindowPtr pWin, int x, int y)

-{

-    Bool result;

-    ScreenPtr pScreen = pWin->drawable.pScreen;

-    glxWinScreen *screenPriv = (glxWinScreen *) glxGetScreen(pScreen);

-    winWindowPriv(pWin);

-

-    pScreen->PositionWindow = screenPriv->PositionWindow;

-    result = pScreen->PositionWindow(pWin, x, y);

-    pScreen->PositionWindow = glxWinPositionWindow;

-

-    if (pWinPriv->GlCtxWnd && pWinPriv->hWnd)

-    {

-       MoveWindow(pWinPriv->hWnd,

-                  pWin->drawable.x,

-                  pWin->drawable.y,

-                  pWin->drawable.width,

-                  pWin->drawable.height,

-                  FALSE);

-    }

-    return result;

-}

-

-

-static Bool

-glxWinUnrealizeWindow(WindowPtr pWin)

-{

-    Bool result;

-    ScreenPtr pScreen = pWin->drawable.pScreen;

-    glxWinScreen *screenPriv = (glxWinScreen *)glxGetScreen(pScreen);

-    winWindowPriv(pWin);

-

-    GLWIN_DEBUG_MSG("glxWinUnrealizeWindow");

-

-    pScreen->UnrealizeWindow = screenPriv->UnrealizeWindow;

-    result = pScreen->UnrealizeWindow(pWin);

-    pScreen->UnrealizeWindow = glxWinUnrealizeWindow;

-

-    if (pWinPriv->GlCtxWnd && pWinPriv->hWnd)

-      ShowWindow(pWinPriv->hWnd,SW_HIDE);

-

-    return result;

-}

-

-static Bool

-glxWinDestroyWindow(WindowPtr pWin)

-{

-    Bool result;

-    ScreenPtr pScreen = pWin->drawable.pScreen;

-    glxWinScreen *screenPriv = (glxWinScreen *)glxGetScreen(pScreen);

-    winWindowPriv(pWin);

-

-    GLWIN_DEBUG_MSG("glxWinDestroyWindow");

-

-    if (pWinPriv->GlCtxWnd && pWinPriv->hWnd)

-    {

-      __GLXWinDrawable *pGlxDraw;

-

-      dixLookupResourceByType((pointer) &pGlxDraw, pWin->drawable.id, __glXDrawableRes, NullClient, DixUnknownAccess);

-

-      if (pGlxDraw && pGlxDraw->drawContext)

-      {

-        if (pGlxDraw->drawContext->hwnd!=pWinPriv->hWnd)

-          ErrorF("Wrong assumption\n");

-        glxWinReleaseDC(pGlxDraw->drawContext->hwnd, pGlxDraw->drawContext->hDC, pGlxDraw);

-        pGlxDraw->drawContext->hDC=NULL;

-        pGlxDraw->drawContext->hwnd=NULL;

-      }

-      DestroyWindow(pWinPriv->hWnd);

-      pWinPriv->hWnd=NULL;

-      pWinPriv->GlCtxWnd=0;

-    }

-

-    pScreen->DestroyWindow = screenPriv->DestroyWindow;

-    result = pScreen->DestroyWindow(pWin);

-    pScreen->DestroyWindow = glxWinDestroyWindow;

-

-    return result;

-}

-

-/* ---------------------------------------------------------------------- */

-/*

- * Drawable functions

- */

-

-static GLboolean

-glxWinDrawableSwapBuffers(ClientPtr client, __GLXdrawable *base)

-{

-    BOOL ret;

-    __GLXWinDrawable *draw = (__GLXWinDrawable *)base;

-

-    /* Swap buffers on the last active context for drawing on the drawable */

-    if (draw->drawContext == NULL)

-      {

-        GLWIN_TRACE_MSG("glxWinSwapBuffers - no context for drawable");

-        return GL_FALSE;

-      }

-

-    GLWIN_TRACE_MSG("glxWinSwapBuffers on drawable %p, last context %p (native ctx %p)", base, draw->drawContext, draw->drawContext->ctx);

-

-    /*

-       draw->drawContext->base.drawPriv will not be set if the context is not current anymore,

-       but if it is, it should point to this drawable....

-    */

-    assert((draw->drawContext->base.drawPriv == NULL) || (draw->drawContext->base.drawPriv == base));

-

-    ret = SwapBuffers(draw->drawContext->hDC);

-

-    if (!ret)

-      {

-        ErrorF("wglSwapBuffers failed: %s\n", glxWinErrorMessage());

-        return GL_FALSE;

-      }

-

-    return GL_TRUE;

-}

-

-static void

-glxWinDrawableCopySubBuffer(__GLXdrawable *drawable,

-                            int x, int y, int w, int h)

-{

-  glAddSwapHintRectWINWrapperNonstatic(x, y, w, h);

-  glxWinDrawableSwapBuffers(NULL, drawable);

-}

-

-static void

-glxWinDrawableDestroy(__GLXdrawable *base)

-{

-  __GLXWinDrawable *glxPriv = (__GLXWinDrawable *)base;

-

-  if (glxPriv->drawContext && (__glXLastContext == &((glxPriv->drawContext)->base)))

-    {

-      // if this context is current and has unflushed commands, say we have flushed them

-      // (don't actually flush them, the window is going away anyhow, and an implict flush occurs

-      // on the next context change)

-      // (GLX core considers it an error when we try to select a new current context if the old one

-      // has unflushed commands, but the window has disappeared..)

-      __GLX_NOTE_FLUSHED_CMDS(__glXLastContext);

-      __glXLastContext = NULL;

-    }

-

-  if (glxPriv->hPbuffer)

-    if (!wglDestroyPbufferARBWrapper(glxPriv->hPbuffer))

-      {

-        ErrorF("wglDestroyPbufferARB failed: %s\n", glxWinErrorMessage());

-      }

-

-  if (glxPriv->dibDC)

-    {

-      // restore the default DIB

-      SelectObject(glxPriv->dibDC, glxPriv->hOldDIB);

-

-      if (!DeleteDC(glxPriv->dibDC))

-        {

-          ErrorF("DeleteDC failed: %s\n", glxWinErrorMessage());

-        }

-    }

-

-  if (glxPriv->hDIB)

-    {

-      if (!DeleteObject(glxPriv->hDIB))

-        {

-          ErrorF("DeleteObject failed: %s\n", glxWinErrorMessage());

-        }

-

-      ((PixmapPtr)glxPriv->base.pDraw)->devPrivate.ptr = glxPriv->pOldBits;

-    }

-

-  GLWIN_DEBUG_MSG("glxWinDestroyDrawable");

-  xfree(glxPriv);

-}

-

-static __GLXdrawable *

-glxWinCreateDrawable(__GLXscreen *screen,

-                    DrawablePtr pDraw,

-                    int type,

-                    XID drawId,

-                    __GLXconfig *conf)

-{

-  __GLXWinDrawable *glxPriv;

-

-  glxPriv = xcalloc(1,sizeof(*glxPriv));

-

-  if (glxPriv == NULL)

-      return NULL;

-

-  if(!__glXDrawableInit(&glxPriv->base, screen, pDraw, type, drawId, conf)) {

-    xfree(glxPriv);

-    return NULL;

-  }

-

-  glxPriv->base.destroy       = glxWinDrawableDestroy;

-  glxPriv->base.swapBuffers   = glxWinDrawableSwapBuffers;

-  glxPriv->base.copySubBuffer = glxWinDrawableCopySubBuffer;

-  // glxPriv->base.waitX  what are these for?

-  // glxPriv->base.waitGL

-

-  GLWIN_DEBUG_MSG("glxWinCreateDrawable %p", glxPriv);

-

-  return &glxPriv->base;

-}

-

-/* ---------------------------------------------------------------------- */

-/*

- * Texture functions

- */

-

-static

-int glxWinBindTexImage(__GLXcontext  *baseContext,

-                      int            buffer,

-                      __GLXdrawable *pixmap)

-{

-  ErrorF("glxWinBindTexImage: not implemented\n");

-  return FALSE;

-}

-

-static

-int glxWinReleaseTexImage(__GLXcontext  *baseContext,

-                         int            buffer,

-                         __GLXdrawable *pixmap)

-{

-  ErrorF(" glxWinReleaseTexImage: not implemented\n");

-  return FALSE;

-}

-

-/* ---------------------------------------------------------------------- */

-/*

- * Lazy update context implementation

- *

- * WGL contexts are created for a specific HDC, so we cannot create the WGL

- * context in glxWinCreateContext(), we must defer creation until the context

- * is actually used on a specifc drawable which is connected to a native window,

- * pbuffer or DIB

- *

- * The WGL context may be used on other, compatible HDCs, so we don't need to

- * recreate it for every new native window

- *

- * XXX: I wonder why we can't create the WGL context on the screen HDC ?

- * Basically we assume all HDCs are compatible at the moment: if they are not

- * we are in a muddle, there was some code in the old implementation to attempt

- * to transparently migrate a context to a new DC by copying state and sharing

- * lists with the old one...

- */

-

-static void

-glxWinSetPixelFormat(__GLXWinContext *gc, HDC hdc, int bppOverride, int drawableTypeOverride)

-{

-  __GLXscreen *screen = gc->base.pGlxScreen;

-  glxWinScreen *winScreen = (glxWinScreen *)screen;

-

-  __GLXconfig *config = gc->base.config;

-  GLXWinConfig *winConfig = (GLXWinConfig *)config;

-  

-  GLWIN_DEBUG_MSG("glxWinSetPixelFormat: pixelFormatIndex %d", winConfig->pixelFormatIndex);

-

-  /*

-    Normally, we can just use the the pixelFormatIndex corresponding

-    to the fbconfig which has been specified by the client

-  */

-

-  if (!((bppOverride && (bppOverride != (config->redBits + config->greenBits + config->blueBits) ))

-        || ((config->drawableType & drawableTypeOverride) == 0)))

-    {

-      if (!SetPixelFormat(hdc, winConfig->pixelFormatIndex, NULL))

-        {

-          ErrorF("SetPixelFormat error: %s\n", glxWinErrorMessage());

-          return;

-        }

-

-      return;

-    }

-

-  /*

-    However, in certain special cases this pixel format will be incompatible with the

-    use we are going to put it to, so we need to re-evaluate the pixel format to use:

-

-    1) When PFD_DRAW_TO_BITMAP is set, ChoosePixelFormat() always returns a format with

-       the cColorBits we asked for, so we need to ensure it matches the bpp of the bitmap

-

-    2) Applications may assume that visuals selected with glXChooseVisual() work with

-       pixmap drawables (there is no attribute to explicitly query for pixmap drawable

-       support as there is for glXChooseFBConfig())

-       (it's arguable this is an error in the application, but we try to make it work)

-

-       pixmap rendering is always slow for us, so we don't want to choose those visuals

-       by default, but if the actual drawable type we're trying to select the context

-       on (drawableTypeOverride) isn't supported by the selected fbConfig, reconsider

-       and see if we can find a suitable one...

-   */

-  ErrorF("glxWinSetPixelFormat: having second thoughts: cColorbits %d, bppOveride %d; config->drawableType %d, drawableTypeOverride %d\n",

-         (config->redBits + config->greenBits + config->blueBits), bppOverride, config->drawableType, drawableTypeOverride);

-

-  if (!winScreen->has_WGL_ARB_pixel_format)

-    {

-      PIXELFORMATDESCRIPTOR pfd;

-      int pixelFormat;

-      

-      /* convert fbConfig to PFD */

-      if (fbConfigToPixelFormat(gc->base.config, &pfd, drawableTypeOverride))

-        {

-          ErrorF("glxWinSetPixelFormat: fbConfigToPixelFormat failed\n");

-          return;

-        }

-

-#ifdef _DEBUG

-        if (glxWinDebugSettings.dumpPFD)

-        pfdOut(&pfd);

-#endif

-

-      if (bppOverride)

-        {

-          GLWIN_DEBUG_MSG("glxWinSetPixelFormat: Forcing bpp from %d to %d\n", pfd.cColorBits, bppOverride);

-          pfd.cColorBits = bppOverride;

-        }

-

-      pixelFormat = ChoosePixelFormat(hdc, &pfd);

-      if (pixelFormat == 0)

-        {

-          ErrorF("ChoosePixelFormat error: %s\n", glxWinErrorMessage());

-          return;

-        }

-

-      GLWIN_DEBUG_MSG("ChoosePixelFormat: chose pixelFormatIndex %d", pixelFormat);

-      ErrorF("ChoosePixelFormat: chose pixelFormatIndex %d (rather than %d as originally planned)\n", pixelFormat, winConfig->pixelFormatIndex);

-

-      if (!SetPixelFormat(hdc, pixelFormat, &pfd))

-        {

-          ErrorF("SetPixelFormat error: %s\n", glxWinErrorMessage());

-          return;

-        }

-    }

-  else

-    {

-      int pixelFormat = fbConfigToPixelFormatIndex(hdc, gc->base.config, drawableTypeOverride, winScreen);

-      if (pixelFormat == 0)

-        {

-          ErrorF("wglChoosePixelFormat error: %s\n", glxWinErrorMessage());

-          return;

-        }

-

-      GLWIN_DEBUG_MSG("wglChoosePixelFormat: chose pixelFormatIndex %d", pixelFormat);

-      ErrorF("wglChoosePixelFormat: chose pixelFormatIndex %d (rather than %d as originally planned)\n", pixelFormat, winConfig->pixelFormatIndex);

-

-      if (!SetPixelFormat(hdc, pixelFormat, NULL))

-        {

-          ErrorF("SetPixelFormat error: %s\n", glxWinErrorMessage());

-          return;

-        }

-    }

-}

-

-static HDC

-glxWinMakeDC(__GLXWinContext *gc, __GLXWinDrawable *draw, HWND *hwnd)

-{

-  HDC hdc = NULL;

-  *hwnd = NULL;

-

-  if (draw == NULL)

-    {

-      GLWIN_TRACE_MSG("No drawable for context %p (native ctx %p)", gc, gc->ctx);

-      return NULL;

-    }

-

-  switch (draw->base.type)

-  {

-    case GLX_DRAWABLE_WINDOW:

-    {

-      winWindowInfoRec winInfo;

-      WindowPtr pWin;

-

-      pWin = (WindowPtr) draw->base.pDraw;

-      if (pWin == NULL)

-        {

-          GLWIN_TRACE_MSG("for drawable %p, no WindowPtr", pWin);

-          return NULL;

-        }

-

-      winGetWindowInfo(pWin, &winInfo);

-      *hwnd = winInfo.hwnd;

-

-      if (winInfo.hwnd == NULL)

-        {

-          ErrorF("No HWND error: %s\n", glxWinErrorMessage());

-          return NULL;

-        }

-

-      hdc = GetDC(winInfo.hwnd);

-

-      if (hdc == NULL)

-        ErrorF("GetDC error: %s: hwnd %x, gc %p, gc->ctx %p ,gc->hwnd %p\n", glxWinErrorMessage(), winInfo.hwnd, gc, gc->ctx, gc->hwnd);

-

-      if (gc->hDC)

-      {

-        glxWinReleaseDC(gc->hwnd, gc->hDC, draw);

-        gc->hDC=NULL;

-      }

-#ifdef _DEBUG

-      if (glxWinDebugSettings.enableTrace)

-        GLWIN_DEBUG_HWND(winInfo.hwnd);

-

-      GLWIN_TRACE_MSG("for context %p (native ctx %p), hWnd changed from %p to %p", gc, gc->ctx, gc->hwnd, winInfo.hwnd);

-#endif

-      gc->hwnd = winInfo.hwnd;

-      

-      /* Check if we need to set the pixelformat */

-      {

-        winWindowPriv(pWin);

-        if (!pWinPriv->PixelFormatSet)

-        {

-          pWinPriv->PixelFormatSet=TRUE;

-          /* We must select a pixelformat, but SetPixelFormat can only be called once for a window... */

-          glxWinSetPixelFormat(gc, hdc, 0, GLX_WINDOW_BIT);

-        }

-      }

-    }

-    break;

-

-  case GLX_DRAWABLE_PBUFFER:

-    {

-      hdc = wglGetPbufferDCARBWrapper(draw->hPbuffer);

-

-      if (hdc == NULL)

-        ErrorF("GetDC (pbuffer) error: %s\n", glxWinErrorMessage());

-    }

-    break;

-

-  case GLX_DRAWABLE_PIXMAP:

-    {

-      hdc = draw->dibDC;

-#ifdef _DEBUG

-      if (glxWinDebugSettings.dumpDC)

-        GLWIN_DEBUG_MSG("Got PIXMAP HDC %p for window %p", hdc, *hwnd);

-#endif

-    }

-    break;

-

-  default:

-    {

-      ErrorF("glxWinMakeDC: tried to makeDC for unhandled drawable type %d\n", draw->base.type);

-    }

-  }

-

-#ifdef _DEBUG

-  if (glxWinDebugSettings.dumpDC)

-    GLWIN_HDC_DEBUG_MSG("Got HDC %p for window %p", hdc, *hwnd);

-#endif

-

-  return hdc;

-}

-

-static void

-glxWinReleaseDC(HWND hwnd, HDC hdc,__GLXWinDrawable *draw)

-{

-  switch (draw->base.type)

-  {

-    case GLX_DRAWABLE_WINDOW:

-    {

-      ReleaseDC(hwnd, hdc);

-    }

-    break;

-

-  case GLX_DRAWABLE_PBUFFER:

-    {

-      if (!wglReleasePbufferDCARBWrapper(draw->hPbuffer, hdc))

-        {

-          ErrorF("wglReleasePbufferDCARB error: %s\n", glxWinErrorMessage());

-        }

-    }

-    break;

-

-  case GLX_DRAWABLE_PIXMAP:

-    {

-      // don't release DC, the memory DC lives as long as the bitmap

-

-      // We must ensure that all GDI drawing into the bitmap has completed

-      // in case we subsequently access the bits from it

-      GdiFlush();

-    }

-    break;

-

-  default:

-    {

-      ErrorF("glxWinReleaseDC: tried to releaseDC for unhandled drawable type %d\n", draw->base.type);

-    }

-  }

-}

-

-static void

-glxWinDeferredCreateContext(__GLXWinContext *gc, __GLXWinDrawable *draw)

-{

-  HWND hwnd;

-  GLWIN_DEBUG_MSG("glxWinDeferredCreateContext: attach context %p to drawable %p", gc, draw);

-

-  switch (draw->base.type)

-  {

-    case GLX_DRAWABLE_WINDOW:

-    {

-      winWindowInfoRec winInfo;

-      WindowPtr pWin = (WindowPtr) draw->base.pDraw;

-

-      if (!(gc->base.config->drawableType & GLX_WINDOW_BIT))

-        {

-          ErrorF("glxWinDeferredCreateContext: tried to attach a context whose fbConfig doesn't have drawableType GLX_WINDOW_BIT to a GLX_DRAWABLE_WINDOW drawable\n");

-        }

-

-      if (pWin == NULL)

-        {

-          GLWIN_DEBUG_MSG("Deferring until X window is created");

-          return;

-        }

-

-      GLWIN_DEBUG_MSG("glxWinDeferredCreateContext: pWin %p", pWin);

-

-      winGetWindowInfo(pWin, &winInfo);

-      if (winInfo.hwnd == NULL)

-        {

-          GLWIN_DEBUG_MSG("Deferring until native window is created");

-          return;

-        }

-    }

-    break;

-

-    case GLX_DRAWABLE_PBUFFER:

-    {

-      if (draw->hPbuffer == NULL)

-        {

-          __GLXscreen *screen;

-          glxWinScreen *winScreen;

-          int pixelFormat;

-          // XXX: which DC are supposed to use???

-          HDC screenDC = GetDC(NULL);

-

-          if (!(gc->base.config->drawableType & GLX_PBUFFER_BIT))

-            {

-              ErrorF("glxWinDeferredCreateContext: tried to attach a context whose fbConfig doesn't have drawableType GLX_PBUFFER_BIT to a GLX_DRAWABLE_PBUFFER drawable\n");

-            }

-

-          screen = gc->base.pGlxScreen;

-          winScreen = (glxWinScreen *)screen;

-

-          pixelFormat = fbConfigToPixelFormatIndex(screenDC, gc->base.config, GLX_DRAWABLE_PBUFFER, winScreen);

-          if (pixelFormat == 0)

-            {

-              ErrorF("wglChoosePixelFormat error: %s\n", glxWinErrorMessage());

-              return;

-            }

-

-          draw->hPbuffer = wglCreatePbufferARBWrapper(screenDC, pixelFormat, draw->base.pDraw->width, draw->base.pDraw->height, NULL);

-          ReleaseDC(NULL, screenDC);

-

-          if (draw->hPbuffer == NULL)

-            {

-              ErrorF("wglCreatePbufferARBWrapper error: %s\n", glxWinErrorMessage());

-              return;

-            }

-

-          GLWIN_DEBUG_MSG("glxWinDeferredCreateContext: pBuffer %p created for drawable %p", draw->hPbuffer, draw);

-        }

-    }

-    break;

-

-    case GLX_DRAWABLE_PIXMAP:

-    {

-      if (draw->dibDC == NULL)

-        {

-          BITMAPINFOHEADER bmpHeader;

-          void *pBits;

-

-          memset (&bmpHeader, 0, sizeof(BITMAPINFOHEADER));

-          bmpHeader.biSize = sizeof(BITMAPINFOHEADER);

-          bmpHeader.biWidth = draw->base.pDraw->width;

-          bmpHeader.biHeight = draw->base.pDraw->height;

-          bmpHeader.biPlanes = 1;

-          bmpHeader.biBitCount = draw->base.pDraw->bitsPerPixel;

-          bmpHeader.biCompression = BI_RGB;

-

-          if (!(gc->base.config->drawableType & GLX_PIXMAP_BIT))

-            {

-              ErrorF("glxWinDeferredCreateContext: tried to attach a context whose fbConfig doesn't have drawableType GLX_PIXMAP_BIT to a GLX_DRAWABLE_PIXMAP drawable\n");

-            }

-

-          draw->dibDC = CreateCompatibleDC(NULL);

-          if (draw->dibDC == NULL)

-            {

-              ErrorF("CreateCompatibleDC error: %s\n", glxWinErrorMessage());

-              return;

-            }

-

-          draw->hDIB = CreateDIBSection(draw->dibDC, (BITMAPINFO *)&bmpHeader, DIB_RGB_COLORS, &pBits, 0, 0);

-          if (draw->dibDC == NULL)

-            {

-              ErrorF("CreateDIBSection error: %s\n", glxWinErrorMessage());

-              return;

-            }

-

-          // XXX: CreateDIBSection insists on allocating the bitmap memory for us, so we're going to

-          // need some jiggery pokery to point the underlying X Drawable's bitmap at the same set of bits

-          // so that they can be read with XGetImage as well as glReadPixels, assuming the formats are

-          // even compatible ...

-          draw->pOldBits = ((PixmapPtr)draw->base.pDraw)->devPrivate.ptr;

-          ((PixmapPtr)draw->base.pDraw)->devPrivate.ptr = pBits;

-

-          // Select the DIB into the DC

-          draw->hOldDIB = SelectObject(draw->dibDC, draw->hDIB);

-          if (!draw->hOldDIB)

-            {

-              ErrorF("SelectObject error: %s\n", glxWinErrorMessage());

-            }

-

-          // Set the pixel format of the bitmap

-          glxWinSetPixelFormat(gc, draw->dibDC, draw->base.pDraw->bitsPerPixel, GLX_PIXMAP_BIT);

-

-          GLWIN_DEBUG_MSG("glxWinDeferredCreateContext: DIB bitmap %p created for drawable %p", draw->hDIB, draw);

-        }

-    }

-    break;

-

-    default:

-    {

-      ErrorF("glxWinDeferredCreateContext: tried to attach unhandled drawable type %d\n", draw->base.type);

-      return;

-    }

-  }

-

-  gc->hDC = glxWinMakeDC(gc, draw, &hwnd);

-  gc->ctx = wglCreateContext(gc->hDC);

-

-  if (gc->ctx == NULL)

-    {

-      glxWinReleaseDC(hwnd, gc->hDC, draw);

-      gc->hDC=0;

-      

-      ErrorF("wglCreateContext error: %s\n", glxWinErrorMessage());

-      return;

-    }

-

-  GLWIN_DEBUG_MSG("glxWinDeferredCreateContext: attached context %p to native context %p drawable %p", gc, gc->ctx, draw);

-

-  // if the native context was created successfully, shareLists if needed

-  if (gc->ctx && gc->shareContext)

-    {

-      GLWIN_DEBUG_MSG("glxWinCreateContextReal shareLists with context %p (native ctx %p)", gc->shareContext, gc->shareContext->ctx);

-

-      if (!wglShareLists(gc->shareContext->ctx, gc->ctx))

-        {

-          ErrorF("wglShareLists error: %s\n", glxWinErrorMessage());

-        }

-    }

-}

-

-/* ---------------------------------------------------------------------- */

-/*

- * Context functions

- */

-

-

-/* Context manipulation routines should return TRUE on success, FALSE on failure */

-static int

-glxWinContextMakeCurrent(__GLXcontext *base)

-{

-  __GLXWinContext *gc = (__GLXWinContext *)base;

-  BOOL ret;

-  __GLXWinDrawable *drawPriv;

-

-#ifdef _DEBUG

-  GLWIN_TRACE_MSG("glxWinContextMakeCurrent context %p (native ctx %p)", gc, gc->ctx);

-  glWinCallDelta();

-#endif

-

-  /* Keep a note of the last active context in the drawable */

-  drawPriv = (__GLXWinDrawable *)gc->base.drawPriv;

-  drawPriv->drawContext = gc;

-

-  if (gc->ctx == NULL)

-    {

-      glxWinDeferredCreateContext(gc, drawPriv);

-    }

-

-  if (gc->ctx == NULL)

-    {

-      ErrorF("glxWinContextMakeCurrent: Native context is NULL\n");

-      return FALSE;

-    }

-

-  if ((gc->base.readPriv != NULL) && (gc->base.readPriv != gc->base.drawPriv))

-    {

-      // XXX: should only occur with WGL_ARB_make_current_read

-      /*

-        If there is a separate read drawable, create a separate read DC, and

-        use the wglMakeContextCurrent extension to make the context current drawing

-        to one DC and reading from the other

-      */

-      gc->hreadDC = glxWinMakeDC(gc, (__GLXWinDrawable *)gc->base.readPriv, &gc->hreadwnd);

-      if (gc->hreadDC == NULL)

-        {

-          ErrorF("glxWinMakeDC failed for readDC\n");

-          return FALSE;

-        }

-

-      ret = wglMakeContextCurrentARBWrapper(gc->hDC, gc->hreadDC, gc->ctx);

-      if (!ret)

-        {

-          ErrorF("wglMakeContextCurrentARBWrapper error: %s\n", glxWinErrorMessage());

-        }

-    }

-  else

-    {

-      /* Otherwise, just use wglMakeCurrent */

-      if (!gc->hDC)

-      {

-        /* It probably has been release by loseCurrent, so create it again */

-        gc->hDC = glxWinMakeDC(gc, drawPriv, &gc->hwnd);

-      }

-      ret = wglMakeCurrent(gc->hDC, gc->ctx);

-      if (!ret)

-        {

-          DWORD ErrorCode=GetLastError();

-          ErrorF("wglMakeCurrent error: %x dc %p ctx %p\n", ErrorCode,gc->hDC,gc->ctx);

-          if (!ErrorCode)

-          {

-            ErrorF("Error code was 0, assuming no error.\n");

-            ret=TRUE;

-          }

-        }

-    }

-

-  // apparently make current could fail if the context is current in a different thread,

-  // but that shouldn't be able to happen in the current server...

-

-  return ret;

-}

-

-static int

-glxWinContextLoseCurrent(__GLXcontext *base)

-{

-  BOOL ret=TRUE;

-  __GLXWinContext *gc = (__GLXWinContext *)base;

-

-#ifdef _DEBUG

-  GLWIN_TRACE_MSG("glxWinContextLoseCurrent context %p (native ctx %p)", gc, gc->ctx);

-  glWinCallDelta();

-#endif

-

-

-  if (wglGetCurrentContext()==gc->ctx)

-  {

-    /* Only do this when we are sure we are currently the active, otherwise we are deactivating the wrong one (this is happening!!!) */

-    ret = wglMakeCurrent(NULL, NULL);

-    if (!ret)

-      ErrorF("glxWinContextLoseCurrent error: %s\n", glxWinErrorMessage());

-  }

-  else

-  {

-    return FALSE;

-  }

-

-  /* Since drawPriv is going to be set to zero in the context, we have to release the DC to */

-  if (gc->hDC && gc->base.drawPriv) glxWinReleaseDC(gc->hwnd, gc->hDC, (__GLXWinDrawable *)gc->base.drawPriv);

-  if (gc->hreadDC && gc->base.readPriv) glxWinReleaseDC(gc->hreadwnd, gc->hreadDC, (__GLXWinDrawable *)gc->base.readPriv);

-  gc->hDC=NULL;

-  gc->hreadDC=NULL;

-  

-  base->isCurrent=FALSE;  /* It looks like glx is not doing this */

-

-  return ret;

-}

-

-static int

-glxWinContextCopy(__GLXcontext *dst_base, __GLXcontext *src_base, unsigned long mask)

-{

-  __GLXWinContext *dst = (__GLXWinContext *)dst_base;

-  __GLXWinContext *src = (__GLXWinContext *)src_base;

-  BOOL ret;

-

-  GLWIN_DEBUG_MSG("glxWinContextCopy");

-

-  ret = wglCopyContext(src->ctx, dst->ctx, mask);

-  if (!ret)

-    {

-      ErrorF("wglCopyContext error: %s\n", glxWinErrorMessage());

-    }

-

-  return ret;

-}

-

-static int

-glxWinContextForceCurrent(__GLXcontext *base)

-{

-  /* wglMakeCurrent always flushes the previous context, so this is equivalent to glxWinContextMakeCurrent */

-  return glxWinContextMakeCurrent(base);

-}

-

-static void

-glxWinContextDestroy(__GLXcontext *base)

-{

-  __GLXWinContext *gc = (__GLXWinContext *)base;

-

-  if (gc != NULL)

-    {

-      GLWIN_DEBUG_MSG("GLXcontext %p destroyed (native ctx %p)", base, gc->ctx);

-

-      if (gc->ctx)

-        {

-          BOOL ret;

-          /* It's bad style to delete the context while it's still current */

-          if (wglGetCurrentContext() == gc->ctx)

-            {

-              wglMakeCurrent(NULL, NULL);

-            }

-

-          ret = wglDeleteContext(gc->ctx);

-          if (!ret)

-            ErrorF("wglDeleteContext error: %s\n", glxWinErrorMessage());

-          if (gc->base.drawPriv && gc->hDC) glxWinReleaseDC(gc->hwnd, gc->hDC, (__GLXWinDrawable *)gc->base.drawPriv);

-          if (gc->base.readPriv && gc->hreadDC) glxWinReleaseDC(gc->hreadwnd, gc->hreadDC, (__GLXWinDrawable *)gc->base.readPriv);

-          gc->hDC=NULL;

-          gc->hreadDC=NULL;

-          gc->ctx = NULL;

-        }

-

-      xfree(gc);

-    }

-}

-

-static __GLXcontext *

-glxWinCreateContext(__GLXscreen *screen,

-                   __GLXconfig *modes,

-                   __GLXcontext *baseShareContext)

-{

-    __GLXWinContext *context;

-    __GLXWinContext *shareContext = (__GLXWinContext *)baseShareContext;

-

-    static __GLXtextureFromPixmap glxWinTextureFromPixmap =

-      {

-        glxWinBindTexImage,

-        glxWinReleaseTexImage

-      };

-

-    context = (__GLXWinContext *)xcalloc(1, sizeof(__GLXWinContext));

-

-    if (!context)

-        return NULL;

-

-    memset(context, 0, sizeof *context);

-    context->base.destroy        = glxWinContextDestroy;

-    context->base.makeCurrent    = glxWinContextMakeCurrent;

-    context->base.loseCurrent    = glxWinContextLoseCurrent;

-    context->base.copy           = glxWinContextCopy;

-    context->base.forceCurrent   = glxWinContextForceCurrent;

-    context->base.textureFromPixmap = &glxWinTextureFromPixmap;

-    context->base.config = modes;

-    context->base.pGlxScreen = screen;

-

-    // actual native GL context creation is deferred until attach()

-    //context->ctx = NULL; already done with memset

-    context->shareContext = shareContext;

-

-    glWinSetupDispatchTable();

-

-    GLWIN_DEBUG_MSG("GLXcontext %p created", context);

-

-    return &(context->base);

-}

-

-/* ---------------------------------------------------------------------- */

-/*

- * Utility functions

- */

-

-static int

-fbConfigToPixelFormat(__GLXconfig *mode, PIXELFORMATDESCRIPTOR *pfdret, int drawableTypeOverride)

-{

-    PIXELFORMATDESCRIPTOR pfd = {

-      sizeof(PIXELFORMATDESCRIPTOR),   /* size of this pfd */

-      1,                     /* version number */

-      PFD_SUPPORT_OPENGL,    /* support OpenGL */

-      PFD_TYPE_RGBA,         /* RGBA type */

-      24,                    /* 24-bit color depth */

-      0, 0, 0, 0, 0, 0,      /* color bits ignored */

-      0,                     /* no alpha buffer */

-      0,                     /* shift bit ignored */

-      0,                     /* no accumulation buffer */

-      0, 0, 0, 0,            /* accum bits ignored */

-      32,                    /* 32-bit z-buffer */

-      0,                     /* no stencil buffer */

-      0,                     /* no auxiliary buffer */

-      PFD_MAIN_PLANE,        /* main layer */

-      0,                     /* reserved */

-      0, 0, 0                /* layer masks ignored */

-    };

-

-    if ((mode->drawableType | drawableTypeOverride) & GLX_WINDOW_BIT)

-      pfd.dwFlags |= PFD_DRAW_TO_WINDOW; /* support window */

-

-    if ((mode->drawableType | drawableTypeOverride) & GLX_PIXMAP_BIT)

-      pfd.dwFlags |= (PFD_DRAW_TO_BITMAP | PFD_SUPPORT_GDI); /* supports software rendering to bitmap */

-

-    if (mode->stereoMode) {

-        pfd.dwFlags |= PFD_STEREO;

-    }

-    if (mode->doubleBufferMode) {

-        pfd.dwFlags |= PFD_DOUBLEBUFFER;

-    }

-

-    pfd.iPixelType = PFD_TYPE_RGBA;

-    pfd.cColorBits = mode->redBits + mode->greenBits + mode->blueBits;

-    pfd.cRedBits = mode->redBits;

-    pfd.cRedShift = 0; /* FIXME */

-    pfd.cGreenBits = mode->greenBits;

-    pfd.cGreenShift = 0; /* FIXME  */

-    pfd.cBlueBits = mode->blueBits;

-    pfd.cBlueShift = 0; /* FIXME */

-    pfd.cAlphaBits = mode->alphaBits;

-    pfd.cAlphaShift = 0; /* FIXME */

-

-    pfd.cAccumBits = mode->accumRedBits + mode->accumGreenBits + mode->accumBlueBits + mode->accumAlphaBits;

-    pfd.cAccumRedBits = mode->accumRedBits;

-    pfd.cAccumGreenBits = mode->accumGreenBits;

-    pfd.cAccumBlueBits = mode->accumBlueBits;

-    pfd.cAccumAlphaBits = mode->accumAlphaBits;

-

-    pfd.cDepthBits = mode->depthBits;

-    pfd.cStencilBits = mode->stencilBits;

-    pfd.cAuxBuffers = mode->numAuxBuffers;

-

-    /* mode->level ? */

-    /* mode->pixmapMode ? */

-

-    *pfdret = pfd;

-

-    return 0;

-}

-

-#define SET_ATTR_VALUE(attr, value) { attribList[i++] = attr; attribList[i++] = value; assert(i < NUM_ELEMENTS(attribList)); }

-

-static int

-fbConfigToPixelFormatIndex(HDC hdc, __GLXconfig *mode, int drawableTypeOverride, glxWinScreen *winScreen)

-{

-  UINT numFormats;

-  unsigned int i = 0;

-

-  /* convert fbConfig to attr-value list  */

-  int attribList[60];

-

-  SET_ATTR_VALUE(WGL_SUPPORT_OPENGL_ARB, TRUE);

-  SET_ATTR_VALUE(WGL_PIXEL_TYPE_ARB, (mode->visualType == GLX_TRUE_COLOR) ? WGL_TYPE_RGBA_ARB : WGL_TYPE_COLORINDEX_ARB);

-  SET_ATTR_VALUE(WGL_COLOR_BITS_ARB, (mode->visualType == GLX_TRUE_COLOR) ? mode->rgbBits : mode->indexBits);

-  SET_ATTR_VALUE(WGL_RED_BITS_ARB, mode->redBits);

-  SET_ATTR_VALUE(WGL_GREEN_BITS_ARB, mode->greenBits);

-  SET_ATTR_VALUE(WGL_BLUE_BITS_ARB, mode->blueBits);

-  SET_ATTR_VALUE(WGL_ALPHA_BITS_ARB, mode->alphaBits);

-  SET_ATTR_VALUE(WGL_ACCUM_RED_BITS_ARB, mode->accumRedBits);

-  SET_ATTR_VALUE(WGL_ACCUM_GREEN_BITS_ARB, mode->accumGreenBits);

-  SET_ATTR_VALUE(WGL_ACCUM_BLUE_BITS_ARB, mode->accumBlueBits);

-  SET_ATTR_VALUE(WGL_ACCUM_ALPHA_BITS_ARB, mode->accumAlphaBits);

-  SET_ATTR_VALUE(WGL_DEPTH_BITS_ARB, mode->depthBits);

-  SET_ATTR_VALUE(WGL_STENCIL_BITS_ARB, mode->stencilBits);

-  SET_ATTR_VALUE(WGL_AUX_BUFFERS_ARB, mode->numAuxBuffers);

-

-  if (mode->doubleBufferMode)

-    SET_ATTR_VALUE(WGL_DOUBLE_BUFFER_ARB, TRUE);

-

-  if (mode->stereoMode)

-    SET_ATTR_VALUE(WGL_STEREO_ARB, TRUE);

-

-  // Some attributes are only added to the list if the value requested is not 'don't care', as exactly matching that is daft..

-  if (mode->swapMethod == GLX_SWAP_EXCHANGE_OML)

-    SET_ATTR_VALUE(WGL_SWAP_METHOD_ARB, WGL_SWAP_EXCHANGE_ARB);

-

-  if (mode->swapMethod == GLX_SWAP_COPY_OML)

-    SET_ATTR_VALUE(WGL_SWAP_COPY_ARB, TRUE);

-

-  // XXX: this should probably be the other way around, but that messes up drawableTypeOverride

-  if (mode->visualRating == GLX_SLOW_VISUAL_EXT)

-    SET_ATTR_VALUE(WGL_ACCELERATION_ARB, WGL_NO_ACCELERATION_ARB);

-

-  // must support all the drawable types the mode supports

-  if ((mode->drawableType | drawableTypeOverride) & GLX_WINDOW_BIT)

-    SET_ATTR_VALUE(WGL_DRAW_TO_WINDOW_ARB,TRUE);

-

-  // XXX: this is a horrible hacky heuristic, in fact this whole drawableTypeOverride thing is a bad idea

-  // try to avoid asking for formats which don't exist (by not asking for all when adjusting the config to include the drawableTypeOverride)

-  if (drawableTypeOverride == GLX_WINDOW_BIT)

-    {

-      if (mode->drawableType & GLX_PIXMAP_BIT)

-        SET_ATTR_VALUE(WGL_DRAW_TO_BITMAP_ARB, TRUE);

-

-      if (mode->drawableType & GLX_PBUFFER_BIT)

-        if (winScreen->has_WGL_ARB_pbuffer)

-          SET_ATTR_VALUE(WGL_DRAW_TO_PBUFFER_ARB, TRUE);

-    }

-  else

-    {

-      if (drawableTypeOverride & GLX_PIXMAP_BIT)

-        SET_ATTR_VALUE(WGL_DRAW_TO_BITMAP_ARB, TRUE);

-

-      if (drawableTypeOverride & GLX_PBUFFER_BIT)

-        if (winScreen->has_WGL_ARB_pbuffer)

-          SET_ATTR_VALUE(WGL_DRAW_TO_PBUFFER_ARB, TRUE);

-    }

-

-  SET_ATTR_VALUE(0, 0); // terminator

-

-  /* choose the first match */

-  {

-    int pixelFormatIndex;

-

-    if (!wglChoosePixelFormatARBWrapper(hdc, attribList, NULL, 1, &pixelFormatIndex, &numFormats))

-      {

-        ErrorF("wglChoosePixelFormat error: %s\n", glxWinErrorMessage());

-      }

-    else

-      {

-        if (numFormats > 0)

-          {

-            GLWIN_DEBUG_MSG("wglChoosePixelFormat: chose pixelFormatIndex %d)", pixelFormatIndex);

-            return pixelFormatIndex;

-          }

-        else

-          ErrorF("wglChoosePixelFormat couldn't decide\n");

-      }

-  }

-

-  return 0;

-}

-

-/* ---------------------------------------------------------------------- */

-

-#define BITS_AND_SHIFT_TO_MASK(bits,mask) (((1<<(bits))-1) << (mask))

-

-//

-// Create the GLXconfigs using DescribePixelFormat()

-//

-static void

-glxWinCreateConfigs(HDC hdc, glxWinScreen *screen)

-{

-  GLXWinConfig *c, *result, *prev = NULL;

-  int numConfigs = 0;

-  int i = 0;

-  int n = 0;

-  PIXELFORMATDESCRIPTOR pfd;

-

-  GLWIN_DEBUG_MSG("glxWinCreateConfigs");

-

-  screen->base.numFBConfigs = 0;

-  screen->base.fbconfigs = NULL;

-

-  // get the number of pixelformats

-  numConfigs = DescribePixelFormat(hdc, 1, sizeof(PIXELFORMATDESCRIPTOR), NULL);

-  GLWIN_DEBUG_MSG("DescribePixelFormat says %d possible pixel formats", numConfigs);

-

-  /* alloc */

-  result = xalloc(sizeof(GLXWinConfig) * numConfigs);

-

-  if (NULL == result)

-    {

-      return;

-    }

-

-  memset(result, 0, sizeof(GLXWinConfig) * numConfigs);

-  n = 0;

-

-  /* fill in configs */

-  for (i = 0;  i < numConfigs; i++)

-    {

-      int rc;

-

-      c = &(result[i]);

-      c->base.next = NULL;

-      c->pixelFormatIndex = i+1;

-

-      rc = DescribePixelFormat(hdc, i+1, sizeof(PIXELFORMATDESCRIPTOR), &pfd);

-

-      if (!rc)

-        {

-          ErrorF("DescribePixelFormat failed for index %d, error %s\n", i+1, glxWinErrorMessage());

-          break;

-        }

-

-#ifdef _DEBUG

-      if (glxWinDebugSettings.dumpPFD)

-        pfdOut(&pfd);

-#endif

-

-      if (!(pfd.dwFlags & (PFD_DRAW_TO_WINDOW | PFD_DRAW_TO_BITMAP)) || !(pfd.dwFlags & PFD_SUPPORT_OPENGL))

-        {

-          GLWIN_DEBUG_MSG("pixelFormat %d has unsuitable flags 0x%08lx, skipping", i+1, pfd.dwFlags);

-          continue;

-        }

-

-      c->base.doubleBufferMode = (pfd.dwFlags & PFD_DOUBLEBUFFER) ? GL_TRUE : GL_FALSE;

-      c->base.stereoMode = (pfd.dwFlags & PFD_STEREO) ? GL_TRUE : GL_FALSE;

-

-      c->base.redBits = pfd.cRedBits;

-      c->base.greenBits = pfd.cGreenBits;

-      c->base.blueBits = pfd.cBlueBits;

-      c->base.alphaBits = pfd.cAlphaBits;

-

-      c->base.redMask = BITS_AND_SHIFT_TO_MASK(pfd.cRedBits, pfd.cRedShift);

-      c->base.greenMask =  BITS_AND_SHIFT_TO_MASK(pfd.cGreenBits, pfd.cGreenShift);

-      c->base.blueMask = BITS_AND_SHIFT_TO_MASK(pfd.cBlueBits, pfd.cBlueShift);

-      c->base.alphaMask = BITS_AND_SHIFT_TO_MASK(pfd.cAlphaBits, pfd.cAlphaShift);

-

-      c->base.rgbBits = pfd.cColorBits;

-

-      if (pfd.iPixelType == PFD_TYPE_COLORINDEX)

-        {

-          c->base.indexBits = pfd.cColorBits;

-        }

-      else

-        {

-          c->base.indexBits = 0;

-        }

-

-      c->base.accumRedBits = pfd.cAccumRedBits;

-      c->base.accumGreenBits = pfd.cAccumGreenBits;

-      c->base.accumBlueBits = pfd.cAccumBlueBits;

-      c->base.accumAlphaBits = pfd.cAccumAlphaBits;

-      //  pfd.cAccumBits;

-

-      c->base.depthBits = pfd.cDepthBits;

-      c->base.stencilBits = pfd.cStencilBits;

-      c->base.numAuxBuffers = pfd.cAuxBuffers;

-

-      // pfd.iLayerType; // ignored

-      c->base.level = 0;

-      // pfd.dwLayerMask; // ignored

-      // pfd.dwDamageMask;  // ignored

-

-      c->base.pixmapMode = 0;

-      c->base.visualID = -1;  // will be set by __glXScreenInit()

-

-      /* EXT_visual_rating / GLX 1.2 */

-      if (pfd.dwFlags & PFD_GENERIC_FORMAT)

-        {

-          c->base.visualRating = GLX_SLOW_VISUAL_EXT;

-        }

-      else

-        {

-          // PFD_GENERIC_ACCELERATED is not considered, so this may be MCD or ICD acclerated...

-          c->base.visualRating = GLX_NONE_EXT;

-        }

-

-      /* EXT_visual_info / GLX 1.2 */

-      if (pfd.iPixelType == PFD_TYPE_COLORINDEX)

-        {

-          c->base.visualType = GLX_STATIC_COLOR;

-        }

-      else

-        {

-          c->base.visualType = GLX_TRUE_COLOR;

-        }

-

-      // pfd.dwVisibleMask; ???

-      c->base.transparentPixel = GLX_NONE;

-      c->base.transparentRed = GLX_NONE;

-      c->base.transparentGreen = GLX_NONE;

-      c->base.transparentBlue = GLX_NONE;

-      c->base.transparentAlpha = GLX_NONE;

-      c->base.transparentIndex = GLX_NONE;

-

-      /* ARB_multisample / SGIS_multisample */

-      c->base.sampleBuffers = 0;

-      c->base.samples = 0;

-

-      /* SGIX_fbconfig / GLX 1.3 */

-      c->base.drawableType = (((pfd.dwFlags & PFD_DRAW_TO_WINDOW) ? GLX_WINDOW_BIT : 0)

-                         | ((pfd.dwFlags & PFD_DRAW_TO_BITMAP) ? GLX_PIXMAP_BIT : 0));

-      c->base.renderType = GLX_RGBA_BIT;

-      c->base.xRenderable = GL_TRUE;

-      c->base.fbconfigID = -1; // will be set by __glXScreenInit()

-

-      /* SGIX_pbuffer / GLX 1.3 */

-      // XXX: How can we find these values out ???

-      c->base.maxPbufferWidth = -1;

-      c->base.maxPbufferHeight = -1;

-      c->base.maxPbufferPixels = -1;

-      c->base.optimalPbufferWidth = 0; // there is no optimal value

-      c->base.optimalPbufferHeight = 0;

-

-      /* SGIX_visual_select_group */

-      // arrange for visuals with the best acceleration to be preferred in selection

-      switch (pfd.dwFlags & (PFD_GENERIC_FORMAT | PFD_GENERIC_ACCELERATED))

-        {

-        case 0:

-          c->base.visualSelectGroup = 2;

-          break;

-

-        case PFD_GENERIC_ACCELERATED:

-          c->base.visualSelectGroup = 1;

-          break;

-

-        case PFD_GENERIC_FORMAT:

-          c->base.visualSelectGroup = 0;

-          break;

-

-        default:

-          ;

-          // "can't happen"

-        }

-

-      /* OML_swap_method */

-      if (pfd.dwFlags & PFD_SWAP_EXCHANGE)

-        c->base.swapMethod = GLX_SWAP_EXCHANGE_OML;

-      else if (pfd.dwFlags & PFD_SWAP_COPY)

-        c->base.swapMethod = GLX_SWAP_COPY_OML;

-      else

-        c->base.swapMethod = GLX_SWAP_UNDEFINED_OML;

-

-      /* EXT_import_context */

-      c->base.screen = screen->base.pScreen->myNum;

-

-      /* EXT_texture_from_pixmap */

-      c->base.bindToTextureRgb = -1;

-      c->base.bindToTextureRgba = -1;

-      c->base.bindToMipmapTexture = -1;

-      c->base.bindToTextureTargets = -1;

-      c->base.yInverted = -1;

-

-      n++;

-

-      // update previous config to point to this config

-      if (prev)

-        prev->base.next = &(c->base);

-

-      prev = c;

-    }

-

-  GLWIN_DEBUG_MSG("found %d pixelFormats suitable for conversion to fbConfigs", n);

-

-  screen->base.numFBConfigs = n;

-  screen->base.fbconfigs = &(result->base);

-}

-

-// helper function to access an attribute value from an attribute value array by attribute

-static

-int getAttrValue(const int attrs[], int values[], unsigned int num, int attr, int fallback)

-{

-  unsigned int i;

-  for (i = 0; i < num; i++)

-    {

-      if (attrs[i] == attr)

-        {

-          GLWIN_TRACE_MSG("getAttrValue attr 0x%x, value %d", attr, values[i]);

-          return values[i];

-        }

-    }

-

-  ErrorF("getAttrValue failed to find attr 0x%x, using default value %d\n", attr, fallback);

-  return fallback;

-}

-

-//

-// Create the GLXconfigs using wglGetPixelFormatAttribfvARB() extension

-//

-static void

-glxWinCreateConfigsExt(HDC hdc, glxWinScreen *screen)

-{

-  GLXWinConfig *c, *result, *prev = NULL;

-  int i = 0;

-  int n = 0;

-

-  const int attr = WGL_NUMBER_PIXEL_FORMATS_ARB;

-  int numConfigs;

-

-  int attrs[50];

-  unsigned int num_attrs = 0;

-

-  GLWIN_DEBUG_MSG("glxWinCreateConfigsExt");

-

-  screen->base.numFBConfigs = 0;

-  screen->base.fbconfigs = NULL;

-

-  if (!wglGetPixelFormatAttribivARBWrapper(hdc, 0, 0, 1, &attr, &numConfigs))

-    {

-      ErrorF("wglGetPixelFormatAttribivARB failed for WGL_NUMBER_PIXEL_FORMATS_ARB: %s\n", glxWinErrorMessage());

-      return;

-    }

-

-  GLWIN_DEBUG_MSG("wglGetPixelFormatAttribivARB says %d possible pixel formats", numConfigs);

-

-  /* alloc */

-  result = xalloc(sizeof(GLXWinConfig) * numConfigs);

-

-  if (NULL == result)

-    {

-      return;

-    }

-

-  memset(result, 0, sizeof(GLXWinConfig) * numConfigs);

-  n = 0;

-

-#define ADD_ATTR(a) { attrs[num_attrs++] = a; assert(num_attrs < NUM_ELEMENTS(attrs)); }

-

-  ADD_ATTR(WGL_DRAW_TO_WINDOW_ARB);

-  ADD_ATTR(WGL_DRAW_TO_BITMAP_ARB);

-  ADD_ATTR(WGL_ACCELERATION_ARB);

-  ADD_ATTR(WGL_SWAP_LAYER_BUFFERS_ARB);

-  ADD_ATTR(WGL_NUMBER_OVERLAYS_ARB);

-  ADD_ATTR(WGL_NUMBER_UNDERLAYS_ARB);

-  ADD_ATTR(WGL_TRANSPARENT_ARB);

-  ADD_ATTR(WGL_TRANSPARENT_RED_VALUE_ARB);

-  ADD_ATTR(WGL_TRANSPARENT_GREEN_VALUE_ARB);

-  ADD_ATTR(WGL_TRANSPARENT_GREEN_VALUE_ARB);

-  ADD_ATTR(WGL_TRANSPARENT_ALPHA_VALUE_ARB);

-  ADD_ATTR(WGL_SUPPORT_OPENGL_ARB);

-  ADD_ATTR(WGL_DOUBLE_BUFFER_ARB);

-  ADD_ATTR(WGL_STEREO_ARB);

-  ADD_ATTR(WGL_PIXEL_TYPE_ARB);

-  ADD_ATTR(WGL_COLOR_BITS_ARB);

-  ADD_ATTR(WGL_RED_BITS_ARB);

-  ADD_ATTR(WGL_RED_SHIFT_ARB);

-  ADD_ATTR(WGL_GREEN_BITS_ARB);

-  ADD_ATTR(WGL_GREEN_SHIFT_ARB);

-  ADD_ATTR(WGL_BLUE_BITS_ARB);

-  ADD_ATTR(WGL_BLUE_SHIFT_ARB);

-  ADD_ATTR(WGL_ALPHA_BITS_ARB);

-  ADD_ATTR(WGL_ALPHA_SHIFT_ARB);

-  ADD_ATTR(WGL_ACCUM_RED_BITS_ARB);

-  ADD_ATTR(WGL_ACCUM_GREEN_BITS_ARB);

-  ADD_ATTR(WGL_ACCUM_BLUE_BITS_ARB);

-  ADD_ATTR(WGL_ACCUM_ALPHA_BITS_ARB);

-  ADD_ATTR(WGL_DEPTH_BITS_ARB);

-  ADD_ATTR(WGL_STENCIL_BITS_ARB);

-  ADD_ATTR(WGL_AUX_BUFFERS_ARB);

-  ADD_ATTR(WGL_SWAP_METHOD_ARB);

-

-  if (screen->has_WGL_ARB_multisample)

-    {

-      // we may not query these attrs if WGL_ARB_multisample is not offered

-      ADD_ATTR(WGL_SAMPLE_BUFFERS_ARB);

-      ADD_ATTR(WGL_SAMPLES_ARB);

-    }

-

-  if (screen->has_WGL_ARB_render_texture)

-    {

-      // we may not query these attrs if WGL_ARB_render_texture is not offered

-      ADD_ATTR(WGL_BIND_TO_TEXTURE_RGB_ARB);

-      ADD_ATTR(WGL_BIND_TO_TEXTURE_RGBA_ARB);

-    }

-

-  if (screen->has_WGL_ARB_pbuffer)

-    {

-      // we may not query these attrs if WGL_ARB_pbuffer is not offered

-      ADD_ATTR(WGL_DRAW_TO_PBUFFER_ARB);

-      ADD_ATTR(WGL_MAX_PBUFFER_PIXELS_ARB);

-      ADD_ATTR(WGL_MAX_PBUFFER_WIDTH_ARB);

-      ADD_ATTR(WGL_MAX_PBUFFER_HEIGHT_ARB);

-    }

-

-  /* fill in configs */

-  for (i = 0;  i < numConfigs; i++)

-    {

-      int sizevalues=num_attrs*sizeof(int);

-      int *values=(int*)_alloca(sizevalues);

-

-      memset(values,0,sizevalues);

-

-      c = &(result[i]);

-      c->base.next = NULL;

-      c->pixelFormatIndex = i+1;

-

-      if (!wglGetPixelFormatAttribivARBWrapper(hdc, i+1, 0, num_attrs, attrs, values))

-        {

-          ErrorF("wglGetPixelFormatAttribivARB failed for index %d, error %s\n", i+1, glxWinErrorMessage());

-          break;

-        }

-

-#define ATTR_VALUE(a, d) getAttrValue(attrs, values, num_attrs, (a), (d))

-

-      if (!ATTR_VALUE(WGL_SUPPORT_OPENGL_ARB, 0))

-        {

-          GLWIN_DEBUG_MSG("pixelFormat %d isn't WGL_SUPPORT_OPENGL_ARB, skipping", i+1);

-          continue;

-        }

-

-      c->base.doubleBufferMode = ATTR_VALUE(WGL_DOUBLE_BUFFER_ARB, 0) ? GL_TRUE : GL_FALSE;

-      c->base.stereoMode = ATTR_VALUE(WGL_STEREO_ARB, 0) ? GL_TRUE : GL_FALSE;

-

-      c->base.redBits = ATTR_VALUE(WGL_RED_BITS_ARB, 0);

-      c->base.greenBits = ATTR_VALUE(WGL_GREEN_BITS_ARB, 0);

-      c->base.blueBits = ATTR_VALUE(WGL_BLUE_BITS_ARB, 0);

-      c->base.alphaBits = ATTR_VALUE(WGL_ALPHA_BITS_ARB, 0);

-

-      c->base.redMask = BITS_AND_SHIFT_TO_MASK(c->base.redBits, ATTR_VALUE(WGL_RED_SHIFT_ARB, 0));

-      c->base.greenMask = BITS_AND_SHIFT_TO_MASK(c->base.greenBits, ATTR_VALUE(WGL_GREEN_SHIFT_ARB, 0));

-      c->base.blueMask = BITS_AND_SHIFT_TO_MASK(c->base.blueBits, ATTR_VALUE(WGL_BLUE_SHIFT_ARB, 0));

-      c->base.alphaMask = BITS_AND_SHIFT_TO_MASK(c->base.alphaBits, ATTR_VALUE(WGL_ALPHA_SHIFT_ARB, 0));

-

-      switch (ATTR_VALUE(WGL_PIXEL_TYPE_ARB, 0))

-        {

-        case WGL_TYPE_COLORINDEX_ARB:

-          c->base.indexBits = ATTR_VALUE(WGL_COLOR_BITS_ARB, 0);

-          c->base.rgbBits = 0;

-          c->base.visualType = GLX_STATIC_COLOR;

-          break;

-

-        case WGL_TYPE_RGBA_FLOAT_ARB:

-          GLWIN_DEBUG_MSG("pixelFormat %d is WGL_TYPE_RGBA_FLOAT_ARB, skipping", i+1);

-          continue;

-

-        case WGL_TYPE_RGBA_UNSIGNED_FLOAT_EXT:

-          GLWIN_DEBUG_MSG("pixelFormat %d is WGL_TYPE_RGBA_UNSIGNED_FLOAT_EXT, skipping", i+1);

-          continue;

-

-        case WGL_TYPE_RGBA_ARB:

-          c->base.indexBits = 0;

-          c->base.rgbBits = ATTR_VALUE(WGL_COLOR_BITS_ARB, 0);

-          c->base.visualType = GLX_TRUE_COLOR;

-          break;

-

-        default:

-          ErrorF("wglGetPixelFormatAttribivARB returned unknown value 0x%x for WGL_PIXEL_TYPE_ARB\n", ATTR_VALUE(WGL_PIXEL_TYPE_ARB, 0));

-          continue;

-        }

-

-      c->base.accumRedBits = ATTR_VALUE(WGL_ACCUM_RED_BITS_ARB, 0);

-      c->base.accumGreenBits = ATTR_VALUE(WGL_ACCUM_GREEN_BITS_ARB, 0);

-      c->base.accumBlueBits = ATTR_VALUE(WGL_ACCUM_BLUE_BITS_ARB, 0);

-      c->base.accumAlphaBits = ATTR_VALUE(WGL_ACCUM_ALPHA_BITS_ARB, 0);

-

-      c->base.depthBits = ATTR_VALUE(WGL_DEPTH_BITS_ARB, 0);

-      c->base.stencilBits = ATTR_VALUE(WGL_STENCIL_BITS_ARB, 0);

-      c->base.numAuxBuffers = ATTR_VALUE(WGL_AUX_BUFFERS_ARB, 0);

-

-      {

-        int layers = ATTR_VALUE(WGL_NUMBER_OVERLAYS_ARB,0) + ATTR_VALUE(WGL_NUMBER_UNDERLAYS_ARB, 0);

-

-        if (layers > 0)

-          {

-            ErrorF("pixelFormat %d: has %d overlay, %d underlays which aren't currently handled", i, ATTR_VALUE(WGL_NUMBER_OVERLAYS_ARB,0), ATTR_VALUE(WGL_NUMBER_UNDERLAYS_ARB, 0));

-            // XXX: need to iterate over layers?

-          }

-      }

-      c->base.level = 0;

-

-      c->base.pixmapMode = 0; // ???

-      c->base.visualID = -1;  // will be set by __glXScreenInit()

-

-      /* EXT_visual_rating / GLX 1.2 */

-      switch (ATTR_VALUE(WGL_ACCELERATION_ARB, 0))

-        {

-        default:

-          ErrorF("wglGetPixelFormatAttribivARB returned unknown value 0x%x for WGL_ACCELERATION_ARB\n", ATTR_VALUE(WGL_ACCELERATION_ARB, 0));

-

-        case WGL_NO_ACCELERATION_ARB:

-          c->base.visualRating = GLX_SLOW_VISUAL_EXT;

-          break;

-

-        case WGL_GENERIC_ACCELERATION_ARB:

-        case WGL_FULL_ACCELERATION_ARB:

-          c->base.visualRating = GLX_NONE_EXT;

-          break;

-        }

-

-      /* EXT_visual_info / GLX 1.2 */

-      // c->base.visualType is set above

-      if (ATTR_VALUE(WGL_TRANSPARENT_ARB, 0))

-        {

-          c->base.transparentPixel = (c->base.visualType == GLX_TRUE_COLOR) ? GLX_TRANSPARENT_RGB_EXT : GLX_TRANSPARENT_INDEX_EXT;

-          c->base.transparentRed = ATTR_VALUE(WGL_TRANSPARENT_RED_VALUE_ARB, 0);

-          c->base.transparentGreen = ATTR_VALUE(WGL_TRANSPARENT_GREEN_VALUE_ARB, 0);

-          c->base.transparentBlue = ATTR_VALUE(WGL_TRANSPARENT_BLUE_VALUE_ARB, 0);

-          c->base.transparentAlpha = ATTR_VALUE(WGL_TRANSPARENT_ALPHA_VALUE_ARB, 0);

-          c->base.transparentIndex = ATTR_VALUE(WGL_TRANSPARENT_INDEX_VALUE_ARB, 0);

-        }

-      else

-        {

-          c->base.transparentPixel = GLX_NONE_EXT;

-          c->base.transparentRed = GLX_NONE;

-          c->base.transparentGreen = GLX_NONE;

-          c->base.transparentBlue = GLX_NONE;

-          c->base.transparentAlpha = GLX_NONE;

-          c->base.transparentIndex = GLX_NONE;

-        }

-

-      /* ARB_multisample / SGIS_multisample */

-      if (screen->has_WGL_ARB_multisample)

-        {

-          c->base.sampleBuffers = ATTR_VALUE(WGL_SAMPLE_BUFFERS_ARB, 0);

-          c->base.samples = ATTR_VALUE(WGL_SAMPLES_ARB, 0);

-        }

-      else

-        {

-          c->base.sampleBuffers = 0;

-          c->base.samples = 0;

-        }

-

-      /* SGIX_fbconfig / GLX 1.3 */

-      c->base.drawableType = ((ATTR_VALUE(WGL_DRAW_TO_WINDOW_ARB, 0) ? GLX_WINDOW_BIT : 0)

-                         | (ATTR_VALUE(WGL_DRAW_TO_BITMAP_ARB, 0) ? GLX_PIXMAP_BIT : 0)

-                         | (ATTR_VALUE(WGL_DRAW_TO_PBUFFER_ARB, 0) ? GLX_PBUFFER_BIT : 0));

-      c->base.renderType = GLX_RGBA_BIT | GLX_COLOR_INDEX_BIT; // Hmmm ???

-      c->base.xRenderable = GL_TRUE;

-      c->base.fbconfigID = -1; // will be set by __glXScreenInit()

-

-      /* SGIX_pbuffer / GLX 1.3 */

-      if (screen->has_WGL_ARB_pbuffer)

-        {

-          c->base.maxPbufferWidth = ATTR_VALUE(WGL_MAX_PBUFFER_WIDTH_ARB, -1);

-          c->base.maxPbufferHeight = ATTR_VALUE(WGL_MAX_PBUFFER_HEIGHT_ARB, -1);

-          c->base.maxPbufferPixels =  ATTR_VALUE(WGL_MAX_PBUFFER_PIXELS_ARB, -1);

-        }

-      else

-        {

-          c->base.maxPbufferWidth = -1;

-          c->base.maxPbufferHeight = -1;

-          c->base.maxPbufferPixels =  -1;

-        }

-      c->base.optimalPbufferWidth = 0; // there is no optimal value

-      c->base.optimalPbufferHeight = 0;

-

-      /* SGIX_visual_select_group */

-      // arrange for visuals with the best acceleration to be preferred in selection

-      switch (ATTR_VALUE(WGL_ACCELERATION_ARB, 0))

-        {

-        case WGL_FULL_ACCELERATION_ARB:

-          c->base.visualSelectGroup = 2;

-          break;

-

-        case WGL_GENERIC_ACCELERATION_ARB:

-          c->base.visualSelectGroup = 1;

-          break;

-

-        default:

-        case WGL_NO_ACCELERATION_ARB:

-          c->base.visualSelectGroup = 0;

-          break;

-        }

-

-      /* OML_swap_method */

-      switch (ATTR_VALUE(WGL_SWAP_METHOD_ARB, 0))

-        {

-        case WGL_SWAP_EXCHANGE_ARB:

-          c->base.swapMethod = GLX_SWAP_EXCHANGE_OML;

-          break;

-

-        case WGL_SWAP_COPY_ARB:

-          c->base.swapMethod = GLX_SWAP_COPY_OML;

-          break;

-

-        default:

-          ErrorF("wglGetPixelFormatAttribivARB returned unknown value 0x%x for WGL_SWAP_METHOD_ARB\n", ATTR_VALUE(WGL_SWAP_METHOD_ARB, 0));

-

-        case WGL_SWAP_UNDEFINED_ARB:

-          c->base.swapMethod = GLX_SWAP_UNDEFINED_OML;

-        }

-

-      /* EXT_import_context */

-      c->base.screen = screen->base.pScreen->myNum;

-

-      /* EXT_texture_from_pixmap */

-      /*

-         Mesa's DRI configs always have bindToTextureRgb/Rgba TRUE (see driCreateConfigs(), so setting

-         bindToTextureRgb/bindToTextureRgba to FALSE means that swrast can't find any fbConfigs to use,

-         so setting these to 0, even if we know bindToTexture isn't available, isn't a good idea...

-       */

-      if (screen->has_WGL_ARB_render_texture)

-        {

-          c->base.bindToTextureRgb = ATTR_VALUE(WGL_BIND_TO_TEXTURE_RGB_ARB, -1);

-          c->base.bindToTextureRgba = ATTR_VALUE(WGL_BIND_TO_TEXTURE_RGBA_ARB, -1);

-        }

-      else

-        {

-          c->base.bindToTextureRgb = -1;

-          c->base.bindToTextureRgba = -1;

-        }

-      c->base.bindToMipmapTexture = -1;

-      c->base.bindToTextureTargets = GLX_TEXTURE_1D_BIT_EXT | GLX_TEXTURE_2D_BIT_EXT | GLX_TEXTURE_RECTANGLE_BIT_EXT;

-      c->base.yInverted = -1;

-

-      n++;

-

-      // update previous config to point to this config

-      if (prev)

-        prev->base.next = &(c->base);

-

-      prev = c;

-    }

-

-  screen->base.numFBConfigs = n;

-  screen->base.fbconfigs = &(result->base);

-}

+/*
+ * File: indirect.c
+ * Purpose: A GLX implementation that uses Windows OpenGL library
+ *
+ * Authors: Alexander Gottwald
+ *          Jon TURNEY
+ *
+ * Copyright (c) Jon TURNEY 2009
+ * Copyright (c) Alexander Gottwald 2004
+ *
+ * Portions of this file are copied from GL/apple/indirect.c,
+ * which contains the following copyright:
+ *
+ * Copyright (c) 2007, 2008, 2009 Apple Inc.
+ * Copyright (c) 2004 Torrey T. Lyons. All Rights Reserved.
+ * Copyright (c) 2002 Greg Parker. All Rights Reserved.
+ *
+ * Portions of this file are copied from Mesa's xf86glx.c,
+ * which contains the following copyright:
+ *
+ * Copyright 1998-1999 Precision Insight, Inc., Cedar Park, Texas.
+ * All Rights Reserved.
+ *
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a
+ * copy of this software and associated documentation files (the "Software"),
+ * to deal in the Software without restriction, including without limitation
+ * the rights to use, copy, modify, merge, publish, distribute, sublicense,
+ * and/or sell copies of the Software, and to permit persons to whom the
+ * Software is furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in
+ * all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
+ * THE ABOVE LISTED COPYRIGHT HOLDER(S) BE LIABLE FOR ANY CLAIM, DAMAGES OR
+ * OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
+ * ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
+ * DEALINGS IN THE SOFTWARE.
+ */
+
+/*
+  TODO:
+  - hook up remaining unimplemented extensions
+  - research what guarantees glXWaitX, glXWaitGL are supposed to offer, and implement then
+    using GdiFlush and/or glFinish
+  - pbuffer clobbering: we don't get async notification, but can we arrange to emit the
+    event when we notice it's been clobbered? at the very least, check if it's been clobbered
+    before using it?
+  - are the __GLXConfig * we get handed back ones we are made (so we can extend the structure
+    with privates?) Or are they created inside the GLX core as well?
+*/
+
+/*
+  MSDN clarifications:
+
+  It says SetPixelFormat()'s PIXELFORMATDESCRIPTOR pointer argument has no effect
+  except on metafiles, this seems to mean that as it's ok to supply NULL if the DC
+  is not for a metafile
+
+  wglMakeCurrent ignores the hdc if hglrc is NULL, so wglMakeCurrent(NULL, NULL)
+  is used to make no context current
+
+*/
+
+#ifdef HAVE_XWIN_CONFIG_H
+#include <xwin-config.h>
+#endif
+
+#include "glwindows.h"
+#include <glx/glxserver.h>
+#include <glx/glxutil.h>
+#include <glx/extension_string.h>
+#include <GL/glxtokens.h>
+
+#include <winpriv.h>
+#include <wgl_ext_api.h>
+#include "win.h"
+#include <winmsg.h>
+
+extern Bool			g_fXdmcpEnabled;
+extern Bool g_fNativeGl;
+
+#define NUM_ELEMENTS(x) (sizeof(x)/ sizeof(x[1]))
+
+/* ---------------------------------------------------------------------- */
+/*
+ *   structure definitions
+ */
+
+typedef struct __GLXWinContext  __GLXWinContext;
+typedef struct __GLXWinDrawable __GLXWinDrawable;
+typedef struct __GLXWinScreen glxWinScreen;
+typedef struct __GLXWinConfig GLXWinConfig;
+
+struct __GLXWinContext {
+  __GLXcontext base;
+  HGLRC ctx;                         /* Windows GL Context */
+  HDC hDC;                           /* Windows device context */
+  HDC hreadDC;                     /* Windows device read context */
+  __GLXWinContext *shareContext;     /* Context with which we will share display lists and textures */
+  HWND hwnd;                         /* For detecting when HWND has changed */
+  HWND hreadwnd;
+};
+
+struct __GLXWinDrawable
+{
+  __GLXdrawable base;
+  __GLXWinContext *drawContext;
+
+  /* If this drawable is GLX_DRAWABLE_PBUFFER */
+  HPBUFFERARB hPbuffer;
+
+  /* If this drawable is GLX_DRAWABLE_PIXMAP */
+  HDC dibDC;
+  HBITMAP hDIB;
+  HBITMAP hOldDIB; /* original DIB for DC */
+  void *pOldBits; /* original pBits for this drawable's pixmap */
+};
+
+struct __GLXWinScreen
+{
+  __GLXscreen base;
+
+  /* Supported GLX extensions */
+  unsigned char glx_enable_bits[__GLX_EXT_BYTES];
+
+  Bool has_WGL_ARB_multisample;
+  Bool has_WGL_ARB_pixel_format;
+  Bool has_WGL_ARB_pbuffer;
+  Bool has_WGL_ARB_render_texture;
+
+  /* wrapped screen functions */
+  RealizeWindowProcPtr RealizeWindow;
+  UnrealizeWindowProcPtr UnrealizeWindow;
+  DestroyWindowProcPtr DestroyWindow;
+  CopyWindowProcPtr CopyWindow;
+  PositionWindowProcPtr PositionWindow;
+};
+
+struct __GLXWinConfig
+{
+  __GLXconfig base;
+  int pixelFormatIndex;
+};
+
+/* ---------------------------------------------------------------------- */
+/*
+ * Various debug helpers
+ */
+
+#ifdef _DEBUG
+void GLWIN_DEBUG_HWND(HWND hwnd)
+{
+  if (glxWinDebugSettings.dumpHWND)
+  {
+    char buffer[1024];
+    RECT Rect;
+    HDC hDc=GetDC(hwnd);
+
+    if (GetWindowText(hwnd, buffer, sizeof(buffer))==0) *buffer=0;
+    GetWindowRect(hwnd,&Rect);
+
+    GLWIN_DEBUG_MSG("Got HWND %p (hdc %p) for window '%s' (%d,%d,%d,%d)", hwnd, hDc, buffer, Rect.left, Rect.top, Rect.right, Rect.bottom);
+    ReleaseDC(hwnd,hDc);
+  }
+}
+
+void GLWIN_HDC_DEBUG_MSG(const char *Message, HDC hDc, HWND hwnd)
+{
+    char buffer[1024];
+    RECT Rect;
+
+    if (GetWindowText(hwnd, buffer, sizeof(buffer))==0) *buffer=0;
+    GetWindowRect(hwnd,&Rect);
+
+    GLWIN_DEBUG_MSG("Got HDC %p (hwnd %p) for window '%s' (%d,%d,%d,%d)", hDc, hwnd, buffer, Rect.left, Rect.top, Rect.right, Rect.bottom);
+
+}
+
+glxWinDebugSettingsRec glxWinDebugSettings = { 0, 0, 0, 0, 0, 0};
+
+static void glxWinInitDebugSettings(void)
+{
+    char *envptr;
+
+    envptr = getenv("GLWIN_ENABLE_DEBUG");
+    if (envptr != NULL)
+        glxWinDebugSettings.enableDebug = (atoi(envptr) == 1);
+
+    envptr = getenv("GLWIN_ENABLE_TRACE");
+    if (envptr != NULL)
+        glxWinDebugSettings.enableTrace = (atoi(envptr) == 1);
+
+    envptr = getenv("GLWIN_DUMP_PFD");
+    if (envptr != NULL)
+        glxWinDebugSettings.dumpPFD = (atoi(envptr) == 1);
+
+    envptr = getenv("GLWIN_DUMP_HWND");
+    if (envptr != NULL)
+        glxWinDebugSettings.dumpHWND = (atoi(envptr) == 1);
+
+    envptr = getenv("GLWIN_DUMP_DC");
+    if (envptr != NULL)
+        glxWinDebugSettings.dumpDC = (atoi(envptr) == 1);
+
+    envptr = getenv("GLWIN_ENABLE_GLCALL_TRACE");
+    if (envptr != NULL)
+        glxWinDebugSettings.enableGLcallTrace = (atoi(envptr) == 1);
+
+    envptr = getenv("GLWIN_ENABLE_WGLCALL_TRACE");
+    if (envptr != NULL)
+        glxWinDebugSettings.enableWGLcallTrace = (atoi(envptr) == 1);
+
+    envptr = getenv("GLWIN_DEBUG_ALL");
+    if (envptr != NULL)
+      {
+        glxWinDebugSettings.enableDebug = 1;
+        glxWinDebugSettings.enableTrace = 1;
+        glxWinDebugSettings.dumpPFD = 1;
+        glxWinDebugSettings.dumpHWND = 1;
+        glxWinDebugSettings.dumpDC = 1;
+        glxWinDebugSettings.enableGLcallTrace = 1;
+        glxWinDebugSettings.enableWGLcallTrace = 1;
+      }
+}
+#endif
+
+static
+const char *glxWinErrorMessage(void)
+{
+  static char errorbuffer[1024];
+  DWORD Error=GetLastError();
+  int offset;
+  
+  sprintf(errorbuffer, "%p ",Error);
+  offset=strlen(errorbuffer);
+
+  if (!FormatMessage(
+                     FORMAT_MESSAGE_FROM_SYSTEM | FORMAT_MESSAGE_IGNORE_INSERTS,
+                     NULL,
+                     Error,
+                     MAKELANGID(LANG_NEUTRAL, SUBLANG_DEFAULT),
+                     (LPTSTR) &errorbuffer[offset],
+                     sizeof(errorbuffer),
+                     NULL ))
+    {
+      snprintf(errorbuffer, sizeof(errorbuffer), "Unknown error in FormatMessage: %08x!", (unsigned)GetLastError());
+    }
+
+  if (errorbuffer[strlen(errorbuffer)-1] == '\n')
+    errorbuffer[strlen(errorbuffer)-1] = 0;
+
+  return errorbuffer;
+}
+
+static void pfdOut(const PIXELFORMATDESCRIPTOR *pfd);
+
+#ifdef _DEBUG
+
+#define DUMP_PFD_FLAG(flag) \
+    if (pfd->dwFlags & flag) { \
+        ErrorF("%s%s", pipesym, #flag); \
+        pipesym = " | "; \
+    }
+
+static void pfdOut(const PIXELFORMATDESCRIPTOR *pfd)
+{
+    const char *pipesym = ""; /* will be set after first flag dump */
+    ErrorF("PIXELFORMATDESCRIPTOR:\n");
+    ErrorF("nSize = %u\n", pfd->nSize);
+    ErrorF("nVersion = %u\n", pfd->nVersion);
+    ErrorF("dwFlags = %lu = {", pfd->dwFlags);
+        DUMP_PFD_FLAG(PFD_DOUBLEBUFFER);
+        DUMP_PFD_FLAG(PFD_STEREO);
+        DUMP_PFD_FLAG(PFD_DRAW_TO_WINDOW);
+        DUMP_PFD_FLAG(PFD_DRAW_TO_BITMAP);
+        DUMP_PFD_FLAG(PFD_SUPPORT_GDI);
+        DUMP_PFD_FLAG(PFD_SUPPORT_OPENGL);
+        DUMP_PFD_FLAG(PFD_GENERIC_FORMAT);
+        DUMP_PFD_FLAG(PFD_NEED_PALETTE);
+        DUMP_PFD_FLAG(PFD_NEED_SYSTEM_PALETTE);
+        DUMP_PFD_FLAG(PFD_SWAP_EXCHANGE);
+        DUMP_PFD_FLAG(PFD_SWAP_COPY);
+        DUMP_PFD_FLAG(PFD_SWAP_LAYER_BUFFERS);
+        DUMP_PFD_FLAG(PFD_GENERIC_ACCELERATED);
+        DUMP_PFD_FLAG(PFD_DEPTH_DONTCARE);
+        DUMP_PFD_FLAG(PFD_DOUBLEBUFFER_DONTCARE);
+        DUMP_PFD_FLAG(PFD_STEREO_DONTCARE);
+    ErrorF("}\n");
+
+    ErrorF("iPixelType = %hu = %s\n", pfd->iPixelType,
+            (pfd->iPixelType == PFD_TYPE_RGBA ? "PFD_TYPE_RGBA" : "PFD_TYPE_COLORINDEX"));
+    ErrorF("cColorBits = %hhu\n", pfd->cColorBits);
+    ErrorF("cRedBits = %hhu\n", pfd->cRedBits);
+    ErrorF("cRedShift = %hhu\n", pfd->cRedShift);
+    ErrorF("cGreenBits = %hhu\n", pfd->cGreenBits);
+    ErrorF("cGreenShift = %hhu\n", pfd->cGreenShift);
+    ErrorF("cBlueBits = %hhu\n", pfd->cBlueBits);
+    ErrorF("cBlueShift = %hhu\n", pfd->cBlueShift);
+    ErrorF("cAlphaBits = %hhu\n", pfd->cAlphaBits);
+    ErrorF("cAlphaShift = %hhu\n", pfd->cAlphaShift);
+    ErrorF("cAccumBits = %hhu\n", pfd->cAccumBits);
+    ErrorF("cAccumRedBits = %hhu\n", pfd->cAccumRedBits);
+    ErrorF("cAccumGreenBits = %hhu\n", pfd->cAccumGreenBits);
+    ErrorF("cAccumBlueBits = %hhu\n", pfd->cAccumBlueBits);
+    ErrorF("cAccumAlphaBits = %hhu\n", pfd->cAccumAlphaBits);
+    ErrorF("cDepthBits = %hhu\n", pfd->cDepthBits);
+    ErrorF("cStencilBits = %hhu\n", pfd->cStencilBits);
+    ErrorF("cAuxBuffers = %hhu\n", pfd->cAuxBuffers);
+    ErrorF("iLayerType = %hhu\n", pfd->iLayerType);
+    ErrorF("bReserved = %hhu\n", pfd->bReserved);
+    ErrorF("dwLayerMask = %lu\n", pfd->dwLayerMask);
+    ErrorF("dwVisibleMask = %lu\n", pfd->dwVisibleMask);
+    ErrorF("dwDamageMask = %lu\n", pfd->dwDamageMask);
+    ErrorF("\n");
+}
+
+static const char *
+visual_class_name(int cls)
+{
+  switch (cls) {
+  case GLX_STATIC_COLOR:
+    return "StaticColor";
+  case GLX_PSEUDO_COLOR:
+    return "PseudoColor";
+  case GLX_STATIC_GRAY:
+    return "StaticGray";
+  case GLX_GRAY_SCALE:
+    return "GrayScale";
+  case GLX_TRUE_COLOR:
+     return "TrueColor";
+  case GLX_DIRECT_COLOR:
+     return "DirectColor";
+  default:
+    return "-none-";
+  }
+}
+
+static const char *
+swap_method_name(int mthd)
+{
+  switch (mthd)
+    {
+    case GLX_SWAP_EXCHANGE_OML:
+      return "xchg";
+    case GLX_SWAP_COPY_OML:
+      return "copy";
+    case GLX_SWAP_UNDEFINED_OML:
+      return "    ";
+    default:
+      return "????";
+    }
+}
+
+static void
+fbConfigsDump(unsigned int n, __GLXconfig *c)
+{
+  ErrorF("%d fbConfigs\n", n);
+  ErrorF("pxf vis  fb                      render         Ste                     aux    accum        MS    drawable             Group/\n");
+  ErrorF("idx  ID  ID VisualType Depth Lvl RGB CI DB Swap reo  R  G  B  A   Z  S  buf AR AG AB AA  bufs num  W P Pb  Float Trans Caveat\n");
+  ErrorF("-----------------------------------------------------------------------------------------------------------------------------\n");
+
+  while (c != NULL)
+    {
+      unsigned int i = ((GLXWinConfig *)c)->pixelFormatIndex;
+
+      ErrorF("%3d  %2x  %2x "
+             "%-11s"
+             " %3d %3d   %s   %s  %s %s  %s  "
+             "%2d %2d %2d %2d  "
+             "%2d %2d  "
+             "%2d  "
+             "%2d %2d %2d %2d"
+             "   %2d   %2d"
+             "  %s %s %s "
+             "    %s   "
+             "  %s   "
+             "  %d %s"
+             "\n",
+             i, c->visualID, c->fbconfigID,
+             visual_class_name(c->visualType),
+             c->rgbBits ? c->rgbBits : c->indexBits,
+             c->level,
+	     (c->renderType & GLX_RGBA_BIT) ? "y" : ".",
+	     (c->renderType & GLX_COLOR_INDEX_BIT) ? "y" : ".",
+	     c->doubleBufferMode ? "y" : ".",
+             swap_method_name(c->swapMethod),
+	     c->stereoMode ? "y" : ".",
+             c->redBits, c->greenBits, c->blueBits, c->alphaBits,
+             c->depthBits, c->stencilBits,
+             c->numAuxBuffers,
+             c->accumRedBits, c->accumGreenBits, c->accumBlueBits, c->accumAlphaBits,
+             c->sampleBuffers, c->samples,
+             (c->drawableType & GLX_WINDOW_BIT) ? "y" : ".",
+             (c->drawableType & GLX_PIXMAP_BIT) ? "y" : ".",
+             (c->drawableType & GLX_PBUFFER_BIT) ? "y" : ".",
+             ".",
+             (c->transparentPixel != GLX_NONE_EXT) ? "y" : ".",
+             c->visualSelectGroup, (c->visualRating == GLX_SLOW_VISUAL_EXT) ? "*" : " ");
+
+      c = c->next;
+    }
+}
+#endif
+
+/* ---------------------------------------------------------------------- */
+/*
+ * Forward declarations
+ */
+
+static __GLXscreen *glxWinScreenProbe(ScreenPtr pScreen);
+static __GLXcontext *glxWinCreateContext(__GLXscreen *screen,
+                                        __GLXconfig *modes,
+                                        __GLXcontext *baseShareContext);
+static __GLXdrawable *glxWinCreateDrawable(__GLXscreen *screen,
+                                          DrawablePtr pDraw,
+                                          int type,
+                                          XID drawId,
+                                          __GLXconfig *conf);
+
+static Bool glxWinRealizeWindow(WindowPtr pWin);
+static Bool glxWinUnrealizeWindow(WindowPtr pWin);
+static Bool glxWinDestroyWindow(WindowPtr pWin);
+static void glxWinCopyWindow(WindowPtr pWindow, DDXPointRec ptOldOrg, RegionPtr prgnSrc);
+static Bool glxWinPositionWindow(WindowPtr pWindow, int x, int y);
+
+static HDC glxWinMakeDC(__GLXWinContext *gc, __GLXWinDrawable *draw, HWND *hwnd);
+static void glxWinReleaseDC(HWND hwnd, HDC hdc, __GLXWinDrawable *draw);
+
+static void glxWinCreateConfigs(HDC dc, glxWinScreen *screen);
+static void glxWinCreateConfigsExt(HDC hdc, glxWinScreen *screen);
+static int fbConfigToPixelFormat(__GLXconfig *mode, PIXELFORMATDESCRIPTOR *pfdret, int drawableTypeOverride);
+static int fbConfigToPixelFormatIndex(HDC hdc, __GLXconfig *mode, int drawableTypeOverride, glxWinScreen *winScreen);
+
+/* ---------------------------------------------------------------------- */
+/*
+ * The GLX provider
+ */
+
+__GLXprovider __glXWGLProvider = {
+    glxWinScreenProbe,
+    "Win32 native WGL",
+    NULL
+};
+
+void
+glxWinPushNativeProvider(void)
+{
+  if (g_fNativeGl)
+    GlxPushProvider(&__glXWGLProvider);
+}
+
+/* ---------------------------------------------------------------------- */
+/*
+ * Screen functions
+ */
+
+static void
+glxWinScreenDestroy(__GLXscreen *screen)
+{
+    GLWIN_DEBUG_MSG("glxWinScreenDestroy(%p)", screen);
+    __glXScreenDestroy(screen);
+    xfree(screen);
+}
+
+static int
+glxWinScreenSwapInterval(__GLXdrawable *drawable, int interval)
+{
+  BOOL ret = wglSwapIntervalEXTWrapper(interval);
+  if (!ret)
+    {
+      ErrorF("wglSwapIntervalEXT interval %d failed:%s\n", interval, glxWinErrorMessage());
+    }
+  return ret;
+}
+
+static LRESULT CALLBACK GlxWindowProc(HWND hwnd, UINT uMsg, WPARAM wParam, LPARAM lParam)
+{
+  if (uMsg== WM_NCHITTEST)
+  {
+    return HTTRANSPARENT;
+  }
+  else
+    return DefWindowProc(hwnd, uMsg, wParam, lParam);
+}
+
+/*
+  Report the extensions split and formatted to avoid overflowing a line
+ */
+static void
+glxLogExtensions(const char *prefix, const char *extensions)
+{
+  int length = 0;
+  char *strl;
+  char *str = xalloc(strlen(extensions) + 1);
+
+  if (str == NULL)
+    {
+      ErrorF("glxLogExtensions: xalloc error\n");
+      return;
+    }
+
+  str[strlen(extensions)] = '\0';
+  strncpy (str, extensions, strlen(extensions));
+
+  strl = strtok(str, " ");
+  winDebug("%s%s", prefix, strl);
+  length = strlen(prefix) + strlen(strl);
+
+  while (1)
+    {
+      strl = strtok(NULL, " ");
+      if (strl == NULL) break;
+
+      if (length + strlen(strl) + 1 > 120)
+        {
+          winDebug("\n");
+          winDebug("%s",prefix);
+          length = strlen(prefix);
+        }
+      else
+        {
+          winDebug(" ");
+          length++;
+        }
+
+      winDebug("%s", strl);
+      length = length + strlen(strl);
+    }
+
+  winDebug("\n");
+
+  xfree(str);
+}
+
+/* This is called by GlxExtensionInit() asking the GLX provider if it can handle the screen... */
+static __GLXscreen *
+glxWinScreenProbe(ScreenPtr pScreen)
+{
+    glxWinScreen *screen;
+    const char *gl_extensions;
+    const char *wgl_extensions;
+    HWND hwnd;
+    HDC hdc;
+    HGLRC hglrc;
+
+    GLWIN_DEBUG_MSG("glxWinScreenProbe");
+
+#ifdef _DEBUG
+    glxWinInitDebugSettings();
+#endif
+
+    if (pScreen == NULL)
+	return NULL;
+
+    if (!winCheckScreenAiglxIsSupported(pScreen))
+      {
+        LogMessage(X_ERROR,"AIGLX: No native OpenGL in modes with a root window\n");
+        return NULL;
+      }
+
+    screen = xcalloc(1, sizeof(glxWinScreen));
+
+    if (NULL == screen)
+	return NULL;
+
+    /* Wrap RealizeWindow, UnrealizeWindow and CopyWindow on this screen */
+    screen->RealizeWindow = pScreen->RealizeWindow;
+    pScreen->RealizeWindow = glxWinRealizeWindow;
+    screen->UnrealizeWindow = pScreen->UnrealizeWindow;
+    pScreen->UnrealizeWindow = glxWinUnrealizeWindow;
+    screen->CopyWindow = pScreen->CopyWindow;
+    pScreen->CopyWindow = glxWinCopyWindow;
+    screen->PositionWindow = pScreen->PositionWindow;
+    pScreen->PositionWindow = glxWinPositionWindow;
+    screen->DestroyWindow = pScreen->DestroyWindow;
+    pScreen->DestroyWindow = glxWinDestroyWindow;
+
+    /* Dump out some useful information about the native renderer */
+
+    // create window class
+    {
+      static wATOM glTestWndClass = 0;
+      if (glTestWndClass == 0)
+        {
+          WNDCLASSEX wc;
+          glTestWndClass=1;
+          wc.cbSize = sizeof(WNDCLASSEX);
+          wc.style = CS_OWNDC ;
+          wc.lpfnWndProc = GlxWindowProc;
+          wc.cbClsExtra = 0;
+          wc.cbWndExtra = 0;
+          wc.hInstance = GetModuleHandle(NULL);
+          wc.hIcon = 0;
+          wc.hCursor = 0;
+          wc.hbrBackground = 0;
+          wc.lpszMenuName = NULL;
+          wc.lpszClassName = WIN_GL_WINDOW_CLASS;
+          wc.hIconSm = 0;
+          RegisterClassEx (&wc);
+      }
+    }
+
+    // create an invisible window for a scratch DC
+    hwnd = CreateWindowExA(0,
+                           WIN_GL_WINDOW_CLASS,
+                           "XWin GL Renderer Capabilities Test Window",
+                           0, 0, 0, 0, 0, NULL, NULL, GetModuleHandle(NULL), NULL);
+    if (hwnd == NULL)
+      LogMessage(X_ERROR,"AIGLX: Couldn't create a window for render capabilities testing\n");
+
+    hdc = GetDC(hwnd);
+
+    // we must set a pixel format before we can create a context, just use the first one...
+    SetPixelFormat(hdc, 1, NULL);
+    hglrc = wglCreateContext(hdc);
+    wglMakeCurrent(hdc, hglrc);
+
+    // initialize wgl extension proc pointers (don't call them before here...)
+    // (but we need to have a current context for them to be resolvable)
+    wglResolveExtensionProcs();
+
+    winDebug("GL_VERSION:     %s\n", glGetStringWrapperNonstatic(GL_VERSION));
+    winDebug("GL_VENDOR:      %s\n", glGetStringWrapperNonstatic(GL_VENDOR));
+    winDebug("GL_RENDERER:    %s\n", glGetStringWrapperNonstatic(GL_RENDERER));
+    gl_extensions = (const char *)glGetStringWrapperNonstatic(GL_EXTENSIONS);
+    glxLogExtensions("GL_EXTENSIONS:  ", gl_extensions);
+    wgl_extensions = wglGetExtensionsStringARBWrapper(hdc);
+    if (!wgl_extensions) wgl_extensions = "";
+    glxLogExtensions("WGL_EXTENSIONS: ", wgl_extensions);
+
+    // Can you see the problem here?  The extensions string is DC specific
+    // Different DCs for windows on a multimonitor system driven by multiple cards
+    // might have completely different capabilities.  Of course, good luck getting
+    // those screens to be accelerated in XP and earlier...
+
+    {
+      // testing facility to not use any WGL extensions
+      char *envptr = getenv("GLWIN_NO_WGL_EXTENSIONS");
+      if ((envptr != NULL) && (atoi(envptr) != 0))
+        {
+          ErrorF("GLWIN_NO_WGL_EXTENSIONS is set, ignoring WGL_EXTENSIONS\n");
+          wgl_extensions = "";
+        }
+    }
+
+    {
+      Bool glx_sgi_make_current_read = FALSE;
+
+      //
+      // Based on the WGL extensions available, enable various GLX extensions
+      // XXX: make this table-driven ?
+      //
+      memset(screen->glx_enable_bits, 0, __GLX_EXT_BYTES);
+
+      __glXEnableExtension(screen->glx_enable_bits, "GLX_EXT_visual_info");
+      __glXEnableExtension(screen->glx_enable_bits, "GLX_EXT_visual_rating");
+      __glXEnableExtension(screen->glx_enable_bits, "GLX_EXT_import_context");
+      __glXEnableExtension(screen->glx_enable_bits, "GLX_OML_swap_method");
+      __glXEnableExtension(screen->glx_enable_bits, "GLX_SGIX_fbconfig");
+
+      if (strstr(wgl_extensions, "WGL_ARB_make_current_read"))
+        {
+          __glXEnableExtension(screen->glx_enable_bits, "GLX_SGI_make_current_read");
+          LogMessage(X_INFO, "AIGLX: enabled GLX_SGI_make_current_read\n");
+          glx_sgi_make_current_read = TRUE;
+        }
+
+      if (strstr(gl_extensions, "GL_WIN_swap_hint"))
+        {
+          __glXEnableExtension(screen->glx_enable_bits, "GLX_MESA_copy_sub_buffer");
+          LogMessage(X_INFO, "AIGLX: enabled GLX_MESA_copy_sub_buffer\n");
+        }
+
+      if (strstr(wgl_extensions, "WGL_EXT_swap_control"))
+        {
+          __glXEnableExtension(screen->glx_enable_bits, "GLX_SGI_swap_control");
+          __glXEnableExtension(screen->glx_enable_bits, "GLX_MESA_swap_control");
+          LogMessage(X_INFO, "AIGLX: enabled GLX_SGI_swap_control and GLX_MESA_swap_control\n");
+        }
+
+/*       // Hmm?  screen->texOffset */
+/*       if (strstr(wgl_extensions, "WGL_ARB_render_texture")) */
+/*         { */
+/*           __glXEnableExtension(screen->glx_enable_bits, "GLX_EXT_texture_from_pixmap"); */
+/*           LogMessage(X_INFO, "AIGLX: GLX_EXT_texture_from_pixmap backed by buffer objects\n"); */
+/*           screen->has_WGL_ARB_render_texture = TRUE; */
+/*         } */
+
+      if (strstr(wgl_extensions, "WGL_ARB_pbuffer"))
+        {
+          __glXEnableExtension(screen->glx_enable_bits, "GLX_SGIX_pbuffer");
+          LogMessage(X_INFO, "AIGLX: enabled GLX_SGIX_pbuffer\n");
+          screen->has_WGL_ARB_pbuffer = TRUE;
+        }
+
+      if (strstr(wgl_extensions, "WGL_ARB_multisample"))
+        {
+          __glXEnableExtension(screen->glx_enable_bits, "GLX_ARB_multisample");
+          __glXEnableExtension(screen->glx_enable_bits, "GLX_SGIS_multisample");
+          LogMessage(X_INFO, "AIGLX: enabled GLX_ARB_multisample and GLX_SGIS_multisample\n");
+          screen->has_WGL_ARB_multisample = TRUE;
+        }
+
+      screen->base.destroy = glxWinScreenDestroy;
+      screen->base.createContext = glxWinCreateContext;
+      screen->base.createDrawable = glxWinCreateDrawable;
+      screen->base.swapInterval = glxWinScreenSwapInterval;
+      screen->base.hyperpipeFuncs = NULL;
+      screen->base.swapBarrierFuncs = NULL;
+      screen->base.pScreen = pScreen;
+
+      if (strstr(wgl_extensions, "WGL_ARB_pixel_format"))
+        {
+          glxWinCreateConfigsExt(hdc, screen);
+          screen->has_WGL_ARB_pixel_format = TRUE;
+        }
+      else
+        {
+          glxWinCreateConfigs(hdc, screen);
+          screen->has_WGL_ARB_pixel_format = FALSE;
+        }
+      // Initializes screen->base.fbconfigs and screen->base.numFBConfigs
+
+      /* These will be set by __glXScreenInit */
+      screen->base.visuals = NULL;
+      screen->base.numVisuals = 0;
+
+      __glXScreenInit(&screen->base, pScreen);
+
+#ifdef _DEBUG
+      // dump out fbConfigs now fbConfigIds and visualIDs have been assigned
+      fbConfigsDump(screen->base.numFBConfigs, screen->base.fbconfigs);
+#endif
+
+      // Override the GL extensions string set by __glXScreenInit()
+      screen->base.GLextensions = xstrdup(gl_extensions);
+
+      // Generate the GLX extensions string (overrides that set by __glXScreenInit())
+      {
+        unsigned int buffer_size = __glXGetExtensionString(screen->glx_enable_bits, NULL);
+        if (buffer_size > 0)
+          {
+            if (screen->base.GLXextensions != NULL)
+              {
+                xfree(screen->base.GLXextensions);
+              }
+
+            screen->base.GLXextensions = xnfalloc(buffer_size);
+            __glXGetExtensionString(screen->glx_enable_bits, screen->base.GLXextensions);
+          }
+      }
+
+      //
+      // Override the GLX version (__glXScreenInit() sets it to "1.2")
+      // if we have all the needed extensionsto operate as a higher version
+      //
+      // SGIX_fbconfig && SGIX_pbuffer && SGI_make_current_read -> 1.3
+      // ARB_multisample -> 1.4
+      //
+      if (screen->has_WGL_ARB_pbuffer && glx_sgi_make_current_read)
+        {
+          xfree(screen->base.GLXversion);
+
+          if (screen->has_WGL_ARB_multisample)
+            {
+              screen->base.GLXversion = xstrdup("1.4");
+              screen->base.GLXmajor = 1;
+              screen->base.GLXminor = 4;
+            }
+          else
+            {
+              screen->base.GLXversion = xstrdup("1.3");
+              screen->base.GLXmajor = 1;
+              screen->base.GLXminor = 3;
+            }
+          LogMessage(X_INFO, "AIGLX: Set GLX version to %s\n", screen->base.GLXversion);
+        }
+    }
+
+    wglMakeCurrent(NULL, NULL);
+    wglDeleteContext(hglrc);
+    ReleaseDC(hwnd, hdc);
+    DestroyWindow(hwnd);
+
+    return &screen->base;
+}
+
+/* ---------------------------------------------------------------------- */
+/*
+ * Window functions
+ */
+
+static Bool
+glxWinRealizeWindow(WindowPtr pWin)
+{
+    Bool result;
+    ScreenPtr pScreen = pWin->drawable.pScreen;
+    glxWinScreen *screenPriv = (glxWinScreen *) glxGetScreen(pScreen);
+    winWindowPriv(pWin);
+
+    GLWIN_DEBUG_MSG("glxWinRealizeWindow");
+
+    /* Allow the window to be created (RootlessRealizeWindow is inside our wrap) */
+    pScreen->RealizeWindow = screenPriv->RealizeWindow;
+    result = pScreen->RealizeWindow(pWin);
+    pScreen->RealizeWindow = glxWinRealizeWindow;
+    
+    // Check if ze need to move the window\n
+    if (pWinPriv->GlCtxWnd && pWinPriv->hWnd)
+    {
+       ShowWindow(pWinPriv->hWnd,SW_SHOW);
+    }
+    return result;
+}
+
+
+static void
+glxWinCopyWindow(WindowPtr pWindow, DDXPointRec ptOldOrg, RegionPtr prgnSrc)
+{
+    __GLXWinDrawable *pGlxDraw;
+    ScreenPtr pScreen = pWindow->drawable.pScreen;
+    glxWinScreen *screenPriv = (glxWinScreen *) glxGetScreen(pScreen);
+
+    GLWIN_TRACE_MSG("glxWinCopyWindow pWindow %p", pWindow);
+
+    dixLookupResourceByType((pointer) &pGlxDraw, pWindow->drawable.id, __glXDrawableRes,
+				NullClient, DixUnknownAccess);
+
+
+    /*
+       Discard any CopyWindow requests if a GL drawing context is pointing at the window
+
+       For regions which are being drawn by GL, the shadow framebuffer doesn't have the
+       correct bits, so we wish to avoid shadow framebuffer damage occuring, which will
+       cause those incorrect bits to be transferred to the display....
+    */
+    if (pGlxDraw && pGlxDraw->drawContext)
+      {
+        GLWIN_DEBUG_MSG("glxWinCopyWindow: discarding");
+        return;
+      }
+
+    GLWIN_DEBUG_MSG("glxWinCopyWindow - passing to hw layer");
+
+    pScreen->CopyWindow = screenPriv->CopyWindow;
+    pScreen->CopyWindow(pWindow, ptOldOrg, prgnSrc);
+    pScreen->CopyWindow = glxWinCopyWindow;
+
+}
+
+static Bool
+glxWinPositionWindow(WindowPtr pWin, int x, int y)
+{
+    Bool result;
+    ScreenPtr pScreen = pWin->drawable.pScreen;
+    glxWinScreen *screenPriv = (glxWinScreen *) glxGetScreen(pScreen);
+    winWindowPriv(pWin);
+
+    pScreen->PositionWindow = screenPriv->PositionWindow;
+    result = pScreen->PositionWindow(pWin, x, y);
+    pScreen->PositionWindow = glxWinPositionWindow;
+
+    if (pWinPriv->GlCtxWnd && pWinPriv->hWnd)
+    {
+       MoveWindow(pWinPriv->hWnd,
+                  pWin->drawable.x,
+                  pWin->drawable.y,
+                  pWin->drawable.width,
+                  pWin->drawable.height,
+                  FALSE);
+    }
+    return result;
+}
+
+
+static Bool
+glxWinUnrealizeWindow(WindowPtr pWin)
+{
+    Bool result;
+    ScreenPtr pScreen = pWin->drawable.pScreen;
+    glxWinScreen *screenPriv = (glxWinScreen *)glxGetScreen(pScreen);
+    winWindowPriv(pWin);
+
+    GLWIN_DEBUG_MSG("glxWinUnrealizeWindow");
+
+    pScreen->UnrealizeWindow = screenPriv->UnrealizeWindow;
+    result = pScreen->UnrealizeWindow(pWin);
+    pScreen->UnrealizeWindow = glxWinUnrealizeWindow;
+
+    if (pWinPriv->GlCtxWnd && pWinPriv->hWnd)
+      ShowWindow(pWinPriv->hWnd,SW_HIDE);
+
+    return result;
+}
+
+static Bool
+glxWinDestroyWindow(WindowPtr pWin)
+{
+    Bool result;
+    ScreenPtr pScreen = pWin->drawable.pScreen;
+    glxWinScreen *screenPriv = (glxWinScreen *)glxGetScreen(pScreen);
+    winWindowPriv(pWin);
+
+    GLWIN_DEBUG_MSG("glxWinDestroyWindow");
+
+    if (pWinPriv->GlCtxWnd && pWinPriv->hWnd)
+    {
+      __GLXWinDrawable *pGlxDraw;
+
+      dixLookupResourceByType((pointer) &pGlxDraw, pWin->drawable.id, __glXDrawableRes, NullClient, DixUnknownAccess);
+
+      if (pGlxDraw && pGlxDraw->drawContext)
+      {
+        if (pGlxDraw->drawContext->hwnd!=pWinPriv->hWnd)
+          ErrorF("Wrong assumption\n");
+        glxWinReleaseDC(pGlxDraw->drawContext->hwnd, pGlxDraw->drawContext->hDC, pGlxDraw);
+        pGlxDraw->drawContext->hDC=NULL;
+        pGlxDraw->drawContext->hwnd=NULL;
+      }
+      DestroyWindow(pWinPriv->hWnd);
+      pWinPriv->hWnd=NULL;
+      pWinPriv->GlCtxWnd=0;
+    }
+
+    pScreen->DestroyWindow = screenPriv->DestroyWindow;
+    result = pScreen->DestroyWindow(pWin);
+    pScreen->DestroyWindow = glxWinDestroyWindow;
+
+    return result;
+}
+
+/* ---------------------------------------------------------------------- */
+/*
+ * Drawable functions
+ */
+
+static GLboolean
+glxWinDrawableSwapBuffers(ClientPtr client, __GLXdrawable *base)
+{
+    BOOL ret;
+    __GLXWinDrawable *draw = (__GLXWinDrawable *)base;
+
+    /* Swap buffers on the last active context for drawing on the drawable */
+    if (draw->drawContext == NULL)
+      {
+        GLWIN_TRACE_MSG("glxWinSwapBuffers - no context for drawable");
+        return GL_FALSE;
+      }
+
+    GLWIN_TRACE_MSG("glxWinSwapBuffers on drawable %p, last context %p (native ctx %p)", base, draw->drawContext, draw->drawContext->ctx);
+
+    /*
+       draw->drawContext->base.drawPriv will not be set if the context is not current anymore,
+       but if it is, it should point to this drawable....
+    */
+    assert((draw->drawContext->base.drawPriv == NULL) || (draw->drawContext->base.drawPriv == base));
+
+    ret = SwapBuffers(draw->drawContext->hDC);
+
+    if (!ret)
+      {
+        ErrorF("wglSwapBuffers failed: %s\n", glxWinErrorMessage());
+        return GL_FALSE;
+      }
+
+    return GL_TRUE;
+}
+
+static void
+glxWinDrawableCopySubBuffer(__GLXdrawable *drawable,
+                            int x, int y, int w, int h)
+{
+  glAddSwapHintRectWINWrapperNonstatic(x, y, w, h);
+  glxWinDrawableSwapBuffers(NULL, drawable);
+}
+
+static void
+glxWinDrawableDestroy(__GLXdrawable *base)
+{
+  __GLXWinDrawable *glxPriv = (__GLXWinDrawable *)base;
+
+  if (glxPriv->drawContext && (__glXLastContext == &((glxPriv->drawContext)->base)))
+    {
+      // if this context is current and has unflushed commands, say we have flushed them
+      // (don't actually flush them, the window is going away anyhow, and an implict flush occurs
+      // on the next context change)
+      // (GLX core considers it an error when we try to select a new current context if the old one
+      // has unflushed commands, but the window has disappeared..)
+      __GLX_NOTE_FLUSHED_CMDS(__glXLastContext);
+      __glXLastContext = NULL;
+    }
+
+  if (glxPriv->hPbuffer)
+    if (!wglDestroyPbufferARBWrapper(glxPriv->hPbuffer))
+      {
+        ErrorF("wglDestroyPbufferARB failed: %s\n", glxWinErrorMessage());
+      }
+
+  if (glxPriv->dibDC)
+    {
+      // restore the default DIB
+      SelectObject(glxPriv->dibDC, glxPriv->hOldDIB);
+
+      if (!DeleteDC(glxPriv->dibDC))
+        {
+          ErrorF("DeleteDC failed: %s\n", glxWinErrorMessage());
+        }
+    }
+
+  if (glxPriv->hDIB)
+    {
+      if (!DeleteObject(glxPriv->hDIB))
+        {
+          ErrorF("DeleteObject failed: %s\n", glxWinErrorMessage());
+        }
+
+      ((PixmapPtr)glxPriv->base.pDraw)->devPrivate.ptr = glxPriv->pOldBits;
+    }
+
+  GLWIN_DEBUG_MSG("glxWinDestroyDrawable");
+  xfree(glxPriv);
+}
+
+static __GLXdrawable *
+glxWinCreateDrawable(__GLXscreen *screen,
+                    DrawablePtr pDraw,
+                    int type,
+                    XID drawId,
+                    __GLXconfig *conf)
+{
+  __GLXWinDrawable *glxPriv;
+
+  glxPriv = xcalloc(1,sizeof(*glxPriv));
+
+  if (glxPriv == NULL)
+      return NULL;
+
+  if(!__glXDrawableInit(&glxPriv->base, screen, pDraw, type, drawId, conf)) {
+    xfree(glxPriv);
+    return NULL;
+  }
+
+  glxPriv->base.destroy       = glxWinDrawableDestroy;
+  glxPriv->base.swapBuffers   = glxWinDrawableSwapBuffers;
+  glxPriv->base.copySubBuffer = glxWinDrawableCopySubBuffer;
+  // glxPriv->base.waitX  what are these for?
+  // glxPriv->base.waitGL
+
+  GLWIN_DEBUG_MSG("glxWinCreateDrawable %p", glxPriv);
+
+  return &glxPriv->base;
+}
+
+/* ---------------------------------------------------------------------- */
+/*
+ * Texture functions
+ */
+
+static
+int glxWinBindTexImage(__GLXcontext  *baseContext,
+                      int            buffer,
+                      __GLXdrawable *pixmap)
+{
+  ErrorF("glxWinBindTexImage: not implemented\n");
+  return FALSE;
+}
+
+static
+int glxWinReleaseTexImage(__GLXcontext  *baseContext,
+                         int            buffer,
+                         __GLXdrawable *pixmap)
+{
+  ErrorF(" glxWinReleaseTexImage: not implemented\n");
+  return FALSE;
+}
+
+/* ---------------------------------------------------------------------- */
+/*
+ * Lazy update context implementation
+ *
+ * WGL contexts are created for a specific HDC, so we cannot create the WGL
+ * context in glxWinCreateContext(), we must defer creation until the context
+ * is actually used on a specifc drawable which is connected to a native window,
+ * pbuffer or DIB
+ *
+ * The WGL context may be used on other, compatible HDCs, so we don't need to
+ * recreate it for every new native window
+ *
+ * XXX: I wonder why we can't create the WGL context on the screen HDC ?
+ * Basically we assume all HDCs are compatible at the moment: if they are not
+ * we are in a muddle, there was some code in the old implementation to attempt
+ * to transparently migrate a context to a new DC by copying state and sharing
+ * lists with the old one...
+ */
+
+static void
+glxWinSetPixelFormat(__GLXWinContext *gc, HDC hdc, int bppOverride, int drawableTypeOverride)
+{
+  __GLXscreen *screen = gc->base.pGlxScreen;
+  glxWinScreen *winScreen = (glxWinScreen *)screen;
+
+  __GLXconfig *config = gc->base.config;
+  GLXWinConfig *winConfig = (GLXWinConfig *)config;
+  
+  GLWIN_DEBUG_MSG("glxWinSetPixelFormat: pixelFormatIndex %d", winConfig->pixelFormatIndex);
+
+  /*
+    Normally, we can just use the the pixelFormatIndex corresponding
+    to the fbconfig which has been specified by the client
+  */
+
+  if (!((bppOverride && (bppOverride != (config->redBits + config->greenBits + config->blueBits) ))
+        || ((config->drawableType & drawableTypeOverride) == 0)))
+    {
+      if (!SetPixelFormat(hdc, winConfig->pixelFormatIndex, NULL))
+        {
+          ErrorF("SetPixelFormat error: %s\n", glxWinErrorMessage());
+          return;
+        }
+
+      return;
+    }
+
+  /*
+    However, in certain special cases this pixel format will be incompatible with the
+    use we are going to put it to, so we need to re-evaluate the pixel format to use:
+
+    1) When PFD_DRAW_TO_BITMAP is set, ChoosePixelFormat() always returns a format with
+       the cColorBits we asked for, so we need to ensure it matches the bpp of the bitmap
+
+    2) Applications may assume that visuals selected with glXChooseVisual() work with
+       pixmap drawables (there is no attribute to explicitly query for pixmap drawable
+       support as there is for glXChooseFBConfig())
+       (it's arguable this is an error in the application, but we try to make it work)
+
+       pixmap rendering is always slow for us, so we don't want to choose those visuals
+       by default, but if the actual drawable type we're trying to select the context
+       on (drawableTypeOverride) isn't supported by the selected fbConfig, reconsider
+       and see if we can find a suitable one...
+   */
+  ErrorF("glxWinSetPixelFormat: having second thoughts: cColorbits %d, bppOveride %d; config->drawableType %d, drawableTypeOverride %d\n",
+         (config->redBits + config->greenBits + config->blueBits), bppOverride, config->drawableType, drawableTypeOverride);
+
+  if (!winScreen->has_WGL_ARB_pixel_format)
+    {
+      PIXELFORMATDESCRIPTOR pfd;
+      int pixelFormat;
+      
+      /* convert fbConfig to PFD */
+      if (fbConfigToPixelFormat(gc->base.config, &pfd, drawableTypeOverride))
+        {
+          ErrorF("glxWinSetPixelFormat: fbConfigToPixelFormat failed\n");
+          return;
+        }
+
+#ifdef _DEBUG
+        if (glxWinDebugSettings.dumpPFD)
+        pfdOut(&pfd);
+#endif
+
+      if (bppOverride)
+        {
+          GLWIN_DEBUG_MSG("glxWinSetPixelFormat: Forcing bpp from %d to %d\n", pfd.cColorBits, bppOverride);
+          pfd.cColorBits = bppOverride;
+        }
+
+      pixelFormat = ChoosePixelFormat(hdc, &pfd);
+      if (pixelFormat == 0)
+        {
+          ErrorF("ChoosePixelFormat error: %s\n", glxWinErrorMessage());
+          return;
+        }
+
+      GLWIN_DEBUG_MSG("ChoosePixelFormat: chose pixelFormatIndex %d", pixelFormat);
+      ErrorF("ChoosePixelFormat: chose pixelFormatIndex %d (rather than %d as originally planned)\n", pixelFormat, winConfig->pixelFormatIndex);
+
+      if (!SetPixelFormat(hdc, pixelFormat, &pfd))
+        {
+          ErrorF("SetPixelFormat error: %s\n", glxWinErrorMessage());
+          return;
+        }
+    }
+  else
+    {
+      int pixelFormat = fbConfigToPixelFormatIndex(hdc, gc->base.config, drawableTypeOverride, winScreen);
+      if (pixelFormat == 0)
+        {
+          ErrorF("wglChoosePixelFormat error: %s\n", glxWinErrorMessage());
+          return;
+        }
+
+      GLWIN_DEBUG_MSG("wglChoosePixelFormat: chose pixelFormatIndex %d", pixelFormat);
+      ErrorF("wglChoosePixelFormat: chose pixelFormatIndex %d (rather than %d as originally planned)\n", pixelFormat, winConfig->pixelFormatIndex);
+
+      if (!SetPixelFormat(hdc, pixelFormat, NULL))
+        {
+          ErrorF("SetPixelFormat error: %s\n", glxWinErrorMessage());
+          return;
+        }
+    }
+}
+
+static HDC
+glxWinMakeDC(__GLXWinContext *gc, __GLXWinDrawable *draw, HWND *hwnd)
+{
+  HDC hdc = NULL;
+  *hwnd = NULL;
+
+  if (draw == NULL)
+    {
+      GLWIN_TRACE_MSG("No drawable for context %p (native ctx %p)", gc, gc->ctx);
+      return NULL;
+    }
+
+  switch (draw->base.type)
+  {
+    case GLX_DRAWABLE_WINDOW:
+    {
+      WindowPtr pWin;
+
+      pWin = (WindowPtr) draw->base.pDraw;
+      if (pWin == NULL)
+        {
+          GLWIN_TRACE_MSG("for drawable %p, no WindowPtr", pWin);
+          return NULL;
+        }
+
+      *hwnd = winGetWindowInfo(pWin);
+
+      if (*hwnd == NULL)
+        {
+          ErrorF("No HWND error: %s\n", glxWinErrorMessage());
+          return NULL;
+        }
+
+      hdc = GetDC(*hwnd);
+
+      if (hdc == NULL)
+        ErrorF("GetDC error: %s: hwnd %x, gc %p, gc->ctx %p ,gc->hwnd %p\n", glxWinErrorMessage(), *hwnd, gc, gc->ctx, gc->hwnd);
+
+      if (gc->hDC)
+      {
+        glxWinReleaseDC(gc->hwnd, gc->hDC, draw);
+        gc->hDC=NULL;
+      }
+#ifdef _DEBUG
+      if (glxWinDebugSettings.enableTrace)
+            GLWIN_DEBUG_HWND(*hwnd);
+
+          GLWIN_TRACE_MSG("for context %p (native ctx %p), hWnd changed from %p to %p", gc, gc->ctx, gc->hwnd, *hwnd);
+#endif
+      gc->hwnd = *hwnd;
+      
+      /* Check if we need to set the pixelformat */
+      {
+        winWindowPriv(pWin);
+        if (!pWinPriv->PixelFormatSet)
+        {
+          pWinPriv->PixelFormatSet=TRUE;
+          /* We must select a pixelformat, but SetPixelFormat can only be called once for a window... */
+          glxWinSetPixelFormat(gc, hdc, 0, GLX_WINDOW_BIT);
+        }
+      }
+    }
+    break;
+
+  case GLX_DRAWABLE_PBUFFER:
+    {
+      hdc = wglGetPbufferDCARBWrapper(draw->hPbuffer);
+
+      if (hdc == NULL)
+        ErrorF("GetDC (pbuffer) error: %s\n", glxWinErrorMessage());
+    }
+    break;
+
+  case GLX_DRAWABLE_PIXMAP:
+    {
+      hdc = draw->dibDC;
+#ifdef _DEBUG
+      if (glxWinDebugSettings.dumpDC)
+        GLWIN_DEBUG_MSG("Got PIXMAP HDC %p for window %p", hdc, *hwnd);
+#endif
+    }
+    break;
+
+  default:
+    {
+      ErrorF("glxWinMakeDC: tried to makeDC for unhandled drawable type %d\n", draw->base.type);
+    }
+  }
+
+#ifdef _DEBUG
+  if (glxWinDebugSettings.dumpDC)
+    GLWIN_HDC_DEBUG_MSG("Got HDC %p for window %p", hdc, *hwnd);
+#endif
+
+  return hdc;
+}
+
+static void
+glxWinReleaseDC(HWND hwnd, HDC hdc,__GLXWinDrawable *draw)
+{
+  switch (draw->base.type)
+  {
+    case GLX_DRAWABLE_WINDOW:
+    {
+      ReleaseDC(hwnd, hdc);
+    }
+    break;
+
+  case GLX_DRAWABLE_PBUFFER:
+    {
+      if (!wglReleasePbufferDCARBWrapper(draw->hPbuffer, hdc))
+        {
+          ErrorF("wglReleasePbufferDCARB error: %s\n", glxWinErrorMessage());
+        }
+    }
+    break;
+
+  case GLX_DRAWABLE_PIXMAP:
+    {
+      // don't release DC, the memory DC lives as long as the bitmap
+
+      // We must ensure that all GDI drawing into the bitmap has completed
+      // in case we subsequently access the bits from it
+      GdiFlush();
+    }
+    break;
+
+  default:
+    {
+      ErrorF("glxWinReleaseDC: tried to releaseDC for unhandled drawable type %d\n", draw->base.type);
+    }
+  }
+}
+
+static void
+glxWinDeferredCreateContext(__GLXWinContext *gc, __GLXWinDrawable *draw)
+{
+  HWND hwnd;
+  GLWIN_DEBUG_MSG("glxWinDeferredCreateContext: attach context %p to drawable %p", gc, draw);
+
+  switch (draw->base.type)
+  {
+    case GLX_DRAWABLE_WINDOW:
+    {
+      WindowPtr pWin = (WindowPtr) draw->base.pDraw;
+
+      if (!(gc->base.config->drawableType & GLX_WINDOW_BIT))
+        {
+          ErrorF("glxWinDeferredCreateContext: tried to attach a context whose fbConfig doesn't have drawableType GLX_WINDOW_BIT to a GLX_DRAWABLE_WINDOW drawable\n");
+        }
+
+      if (pWin == NULL)
+        {
+          GLWIN_DEBUG_MSG("Deferring until X window is created");
+          return;
+        }
+
+      GLWIN_DEBUG_MSG("glxWinDeferredCreateContext: pWin %p", pWin);
+
+      if (winGetWindowInfo(pWin) == NULL)
+        {
+          GLWIN_DEBUG_MSG("Deferring until native window is created");
+          return;
+        }
+    }
+    break;
+
+    case GLX_DRAWABLE_PBUFFER:
+    {
+      if (draw->hPbuffer == NULL)
+        {
+          __GLXscreen *screen;
+          glxWinScreen *winScreen;
+          int pixelFormat;
+          // XXX: which DC are supposed to use???
+          HDC screenDC = GetDC(NULL);
+
+          if (!(gc->base.config->drawableType & GLX_PBUFFER_BIT))
+            {
+              ErrorF("glxWinDeferredCreateContext: tried to attach a context whose fbConfig doesn't have drawableType GLX_PBUFFER_BIT to a GLX_DRAWABLE_PBUFFER drawable\n");
+            }
+
+          screen = gc->base.pGlxScreen;
+          winScreen = (glxWinScreen *)screen;
+
+          pixelFormat = fbConfigToPixelFormatIndex(screenDC, gc->base.config, GLX_DRAWABLE_PBUFFER, winScreen);
+          if (pixelFormat == 0)
+            {
+              ErrorF("wglChoosePixelFormat error: %s\n", glxWinErrorMessage());
+              return;
+            }
+
+          draw->hPbuffer = wglCreatePbufferARBWrapper(screenDC, pixelFormat, draw->base.pDraw->width, draw->base.pDraw->height, NULL);
+          ReleaseDC(NULL, screenDC);
+
+          if (draw->hPbuffer == NULL)
+            {
+              ErrorF("wglCreatePbufferARBWrapper error: %s\n", glxWinErrorMessage());
+              return;
+            }
+
+          GLWIN_DEBUG_MSG("glxWinDeferredCreateContext: pBuffer %p created for drawable %p", draw->hPbuffer, draw);
+        }
+    }
+    break;
+
+    case GLX_DRAWABLE_PIXMAP:
+    {
+      if (draw->dibDC == NULL)
+        {
+          BITMAPINFOHEADER bmpHeader;
+          void *pBits;
+
+          memset (&bmpHeader, 0, sizeof(BITMAPINFOHEADER));
+          bmpHeader.biSize = sizeof(BITMAPINFOHEADER);
+          bmpHeader.biWidth = draw->base.pDraw->width;
+          bmpHeader.biHeight = draw->base.pDraw->height;
+          bmpHeader.biPlanes = 1;
+          bmpHeader.biBitCount = draw->base.pDraw->bitsPerPixel;
+          bmpHeader.biCompression = BI_RGB;
+
+          if (!(gc->base.config->drawableType & GLX_PIXMAP_BIT))
+            {
+              ErrorF("glxWinDeferredCreateContext: tried to attach a context whose fbConfig doesn't have drawableType GLX_PIXMAP_BIT to a GLX_DRAWABLE_PIXMAP drawable\n");
+            }
+
+          draw->dibDC = CreateCompatibleDC(NULL);
+          if (draw->dibDC == NULL)
+            {
+              ErrorF("CreateCompatibleDC error: %s\n", glxWinErrorMessage());
+              return;
+            }
+
+          draw->hDIB = CreateDIBSection(draw->dibDC, (BITMAPINFO *)&bmpHeader, DIB_RGB_COLORS, &pBits, 0, 0);
+          if (draw->dibDC == NULL)
+            {
+              ErrorF("CreateDIBSection error: %s\n", glxWinErrorMessage());
+              return;
+            }
+
+          // XXX: CreateDIBSection insists on allocating the bitmap memory for us, so we're going to
+          // need some jiggery pokery to point the underlying X Drawable's bitmap at the same set of bits
+          // so that they can be read with XGetImage as well as glReadPixels, assuming the formats are
+          // even compatible ...
+          draw->pOldBits = ((PixmapPtr)draw->base.pDraw)->devPrivate.ptr;
+          ((PixmapPtr)draw->base.pDraw)->devPrivate.ptr = pBits;
+
+          // Select the DIB into the DC
+          draw->hOldDIB = SelectObject(draw->dibDC, draw->hDIB);
+          if (!draw->hOldDIB)
+            {
+              ErrorF("SelectObject error: %s\n", glxWinErrorMessage());
+            }
+
+          // Set the pixel format of the bitmap
+          glxWinSetPixelFormat(gc, draw->dibDC, draw->base.pDraw->bitsPerPixel, GLX_PIXMAP_BIT);
+
+          GLWIN_DEBUG_MSG("glxWinDeferredCreateContext: DIB bitmap %p created for drawable %p", draw->hDIB, draw);
+        }
+    }
+    break;
+
+    default:
+    {
+      ErrorF("glxWinDeferredCreateContext: tried to attach unhandled drawable type %d\n", draw->base.type);
+      return;
+    }
+  }
+
+  gc->hDC = glxWinMakeDC(gc, draw, &hwnd);
+  gc->ctx = wglCreateContext(gc->hDC);
+
+  if (gc->ctx == NULL)
+    {
+      glxWinReleaseDC(hwnd, gc->hDC, draw);
+      gc->hDC=0;
+      
+      ErrorF("wglCreateContext error: %s\n", glxWinErrorMessage());
+      return;
+    }
+
+  GLWIN_DEBUG_MSG("glxWinDeferredCreateContext: attached context %p to native context %p drawable %p", gc, gc->ctx, draw);
+
+  // if the native context was created successfully, shareLists if needed
+  if (gc->ctx && gc->shareContext)
+    {
+      GLWIN_DEBUG_MSG("glxWinCreateContextReal shareLists with context %p (native ctx %p)", gc->shareContext, gc->shareContext->ctx);
+
+      if (!wglShareLists(gc->shareContext->ctx, gc->ctx))
+        {
+          ErrorF("wglShareLists error: %s\n", glxWinErrorMessage());
+        }
+    }
+}
+
+/* ---------------------------------------------------------------------- */
+/*
+ * Context functions
+ */
+
+
+/* Context manipulation routines should return TRUE on success, FALSE on failure */
+static int
+glxWinContextMakeCurrent(__GLXcontext *base)
+{
+  __GLXWinContext *gc = (__GLXWinContext *)base;
+  BOOL ret;
+  __GLXWinDrawable *drawPriv;
+
+#ifdef _DEBUG
+  GLWIN_TRACE_MSG("glxWinContextMakeCurrent context %p (native ctx %p)", gc, gc->ctx);
+  glWinCallDelta();
+#endif
+
+  /* Keep a note of the last active context in the drawable */
+  drawPriv = (__GLXWinDrawable *)gc->base.drawPriv;
+  drawPriv->drawContext = gc;
+
+  if (gc->ctx == NULL)
+    {
+      glxWinDeferredCreateContext(gc, drawPriv);
+    }
+
+  if (gc->ctx == NULL)
+    {
+      ErrorF("glxWinContextMakeCurrent: Native context is NULL\n");
+      return FALSE;
+    }
+
+  if ((gc->base.readPriv != NULL) && (gc->base.readPriv != gc->base.drawPriv))
+    {
+      // XXX: should only occur with WGL_ARB_make_current_read
+      /*
+        If there is a separate read drawable, create a separate read DC, and
+        use the wglMakeContextCurrent extension to make the context current drawing
+        to one DC and reading from the other
+      */
+      gc->hreadDC = glxWinMakeDC(gc, (__GLXWinDrawable *)gc->base.readPriv, &gc->hreadwnd);
+      if (gc->hreadDC == NULL)
+        {
+          ErrorF("glxWinMakeDC failed for readDC\n");
+          return FALSE;
+        }
+
+      ret = wglMakeContextCurrentARBWrapper(gc->hDC, gc->hreadDC, gc->ctx);
+      if (!ret)
+        {
+          ErrorF("wglMakeContextCurrentARBWrapper error: %s\n", glxWinErrorMessage());
+        }
+    }
+  else
+    {
+      /* Otherwise, just use wglMakeCurrent */
+      if (!gc->hDC)
+      {
+        /* It probably has been release by loseCurrent, so create it again */
+        gc->hDC = glxWinMakeDC(gc, drawPriv, &gc->hwnd);
+      }
+      ret = wglMakeCurrent(gc->hDC, gc->ctx);
+      if (!ret)
+        {
+          DWORD ErrorCode=GetLastError();
+          ErrorF("wglMakeCurrent error: %x dc %p ctx %p\n", ErrorCode,gc->hDC,gc->ctx);
+          if (!ErrorCode)
+          {
+            ErrorF("Error code was 0, assuming no error.\n");
+            ret=TRUE;
+          }
+        }
+    }
+
+  // apparently make current could fail if the context is current in a different thread,
+  // but that shouldn't be able to happen in the current server...
+
+  return ret;
+}
+
+static int
+glxWinContextLoseCurrent(__GLXcontext *base)
+{
+  BOOL ret=TRUE;
+  __GLXWinContext *gc = (__GLXWinContext *)base;
+
+#ifdef _DEBUG
+  GLWIN_TRACE_MSG("glxWinContextLoseCurrent context %p (native ctx %p)", gc, gc->ctx);
+  glWinCallDelta();
+#endif
+
+
+  if (wglGetCurrentContext()==gc->ctx)
+  {
+    /* Only do this when we are sure we are currently the active, otherwise we are deactivating the wrong one (this is happening!!!) */
+    ret = wglMakeCurrent(NULL, NULL);
+    if (!ret)
+      ErrorF("glxWinContextLoseCurrent error: %s\n", glxWinErrorMessage());
+  }
+  else
+  {
+    return FALSE;
+  }
+
+  /* Since drawPriv is going to be set to zero in the context, we have to release the DC to */
+  if (gc->hDC && gc->base.drawPriv) glxWinReleaseDC(gc->hwnd, gc->hDC, (__GLXWinDrawable *)gc->base.drawPriv);
+  if (gc->hreadDC && gc->base.readPriv) glxWinReleaseDC(gc->hreadwnd, gc->hreadDC, (__GLXWinDrawable *)gc->base.readPriv);
+  gc->hDC=NULL;
+  gc->hreadDC=NULL;
+  
+  base->isCurrent=FALSE;  /* It looks like glx is not doing this */
+
+  return ret;
+}
+
+static int
+glxWinContextCopy(__GLXcontext *dst_base, __GLXcontext *src_base, unsigned long mask)
+{
+  __GLXWinContext *dst = (__GLXWinContext *)dst_base;
+  __GLXWinContext *src = (__GLXWinContext *)src_base;
+  BOOL ret;
+
+  GLWIN_DEBUG_MSG("glxWinContextCopy");
+
+  ret = wglCopyContext(src->ctx, dst->ctx, mask);
+  if (!ret)
+    {
+      ErrorF("wglCopyContext error: %s\n", glxWinErrorMessage());
+    }
+
+  return ret;
+}
+
+static int
+glxWinContextForceCurrent(__GLXcontext *base)
+{
+  /* wglMakeCurrent always flushes the previous context, so this is equivalent to glxWinContextMakeCurrent */
+  return glxWinContextMakeCurrent(base);
+}
+
+static void
+glxWinContextDestroy(__GLXcontext *base)
+{
+  __GLXWinContext *gc = (__GLXWinContext *)base;
+
+  if (gc != NULL)
+    {
+      GLWIN_DEBUG_MSG("GLXcontext %p destroyed (native ctx %p)", base, gc->ctx);
+
+      if (gc->ctx)
+        {
+          BOOL ret;
+          /* It's bad style to delete the context while it's still current */
+          if (wglGetCurrentContext() == gc->ctx)
+            {
+              wglMakeCurrent(NULL, NULL);
+            }
+
+          ret = wglDeleteContext(gc->ctx);
+          if (!ret)
+            ErrorF("wglDeleteContext error: %s\n", glxWinErrorMessage());
+          if (gc->base.drawPriv && gc->hDC) glxWinReleaseDC(gc->hwnd, gc->hDC, (__GLXWinDrawable *)gc->base.drawPriv);
+          if (gc->base.readPriv && gc->hreadDC) glxWinReleaseDC(gc->hreadwnd, gc->hreadDC, (__GLXWinDrawable *)gc->base.readPriv);
+          gc->hDC=NULL;
+          gc->hreadDC=NULL;
+          gc->ctx = NULL;
+        }
+
+      xfree(gc);
+    }
+}
+
+static __GLXcontext *
+glxWinCreateContext(__GLXscreen *screen,
+                   __GLXconfig *modes,
+                   __GLXcontext *baseShareContext)
+{
+    __GLXWinContext *context;
+    __GLXWinContext *shareContext = (__GLXWinContext *)baseShareContext;
+
+    static __GLXtextureFromPixmap glxWinTextureFromPixmap =
+      {
+        glxWinBindTexImage,
+        glxWinReleaseTexImage
+      };
+
+    context = (__GLXWinContext *)xcalloc(1, sizeof(__GLXWinContext));
+
+    if (!context)
+        return NULL;
+
+    memset(context, 0, sizeof *context);
+    context->base.destroy        = glxWinContextDestroy;
+    context->base.makeCurrent    = glxWinContextMakeCurrent;
+    context->base.loseCurrent    = glxWinContextLoseCurrent;
+    context->base.copy           = glxWinContextCopy;
+    context->base.forceCurrent   = glxWinContextForceCurrent;
+    context->base.textureFromPixmap = &glxWinTextureFromPixmap;
+    context->base.config = modes;
+    context->base.pGlxScreen = screen;
+
+    // actual native GL context creation is deferred until attach()
+    //context->ctx = NULL; already done with memset
+    context->shareContext = shareContext;
+
+    glWinSetupDispatchTable();
+
+    GLWIN_DEBUG_MSG("GLXcontext %p created", context);
+
+    return &(context->base);
+}
+
+/* ---------------------------------------------------------------------- */
+/*
+ * Utility functions
+ */
+
+static int
+fbConfigToPixelFormat(__GLXconfig *mode, PIXELFORMATDESCRIPTOR *pfdret, int drawableTypeOverride)
+{
+    PIXELFORMATDESCRIPTOR pfd = {
+      sizeof(PIXELFORMATDESCRIPTOR),   /* size of this pfd */
+      1,                     /* version number */
+      PFD_SUPPORT_OPENGL,    /* support OpenGL */
+      PFD_TYPE_RGBA,         /* RGBA type */
+      24,                    /* 24-bit color depth */
+      0, 0, 0, 0, 0, 0,      /* color bits ignored */
+      0,                     /* no alpha buffer */
+      0,                     /* shift bit ignored */
+      0,                     /* no accumulation buffer */
+      0, 0, 0, 0,            /* accum bits ignored */
+      32,                    /* 32-bit z-buffer */
+      0,                     /* no stencil buffer */
+      0,                     /* no auxiliary buffer */
+      PFD_MAIN_PLANE,        /* main layer */
+      0,                     /* reserved */
+      0, 0, 0                /* layer masks ignored */
+    };
+
+    if ((mode->drawableType | drawableTypeOverride) & GLX_WINDOW_BIT)
+      pfd.dwFlags |= PFD_DRAW_TO_WINDOW; /* support window */
+
+    if ((mode->drawableType | drawableTypeOverride) & GLX_PIXMAP_BIT)
+      pfd.dwFlags |= (PFD_DRAW_TO_BITMAP | PFD_SUPPORT_GDI); /* supports software rendering to bitmap */
+
+    if (mode->stereoMode) {
+        pfd.dwFlags |= PFD_STEREO;
+    }
+    if (mode->doubleBufferMode) {
+        pfd.dwFlags |= PFD_DOUBLEBUFFER;
+    }
+
+    pfd.iPixelType = PFD_TYPE_RGBA;
+    pfd.cColorBits = mode->redBits + mode->greenBits + mode->blueBits;
+    pfd.cRedBits = mode->redBits;
+    pfd.cRedShift = 0; /* FIXME */
+    pfd.cGreenBits = mode->greenBits;
+    pfd.cGreenShift = 0; /* FIXME  */
+    pfd.cBlueBits = mode->blueBits;
+    pfd.cBlueShift = 0; /* FIXME */
+    pfd.cAlphaBits = mode->alphaBits;
+    pfd.cAlphaShift = 0; /* FIXME */
+
+    pfd.cAccumBits = mode->accumRedBits + mode->accumGreenBits + mode->accumBlueBits + mode->accumAlphaBits;
+    pfd.cAccumRedBits = mode->accumRedBits;
+    pfd.cAccumGreenBits = mode->accumGreenBits;
+    pfd.cAccumBlueBits = mode->accumBlueBits;
+    pfd.cAccumAlphaBits = mode->accumAlphaBits;
+
+    pfd.cDepthBits = mode->depthBits;
+    pfd.cStencilBits = mode->stencilBits;
+    pfd.cAuxBuffers = mode->numAuxBuffers;
+
+    /* mode->level ? */
+    /* mode->pixmapMode ? */
+
+    *pfdret = pfd;
+
+    return 0;
+}
+
+#define SET_ATTR_VALUE(attr, value) { attribList[i++] = attr; attribList[i++] = value; assert(i < NUM_ELEMENTS(attribList)); }
+
+static int
+fbConfigToPixelFormatIndex(HDC hdc, __GLXconfig *mode, int drawableTypeOverride, glxWinScreen *winScreen)
+{
+  UINT numFormats;
+  unsigned int i = 0;
+
+  /* convert fbConfig to attr-value list  */
+  int attribList[60];
+
+  SET_ATTR_VALUE(WGL_SUPPORT_OPENGL_ARB, TRUE);
+  SET_ATTR_VALUE(WGL_PIXEL_TYPE_ARB, (mode->visualType == GLX_TRUE_COLOR) ? WGL_TYPE_RGBA_ARB : WGL_TYPE_COLORINDEX_ARB);
+  SET_ATTR_VALUE(WGL_COLOR_BITS_ARB, (mode->visualType == GLX_TRUE_COLOR) ? mode->rgbBits : mode->indexBits);
+  SET_ATTR_VALUE(WGL_RED_BITS_ARB, mode->redBits);
+  SET_ATTR_VALUE(WGL_GREEN_BITS_ARB, mode->greenBits);
+  SET_ATTR_VALUE(WGL_BLUE_BITS_ARB, mode->blueBits);
+  SET_ATTR_VALUE(WGL_ALPHA_BITS_ARB, mode->alphaBits);
+  SET_ATTR_VALUE(WGL_ACCUM_RED_BITS_ARB, mode->accumRedBits);
+  SET_ATTR_VALUE(WGL_ACCUM_GREEN_BITS_ARB, mode->accumGreenBits);
+  SET_ATTR_VALUE(WGL_ACCUM_BLUE_BITS_ARB, mode->accumBlueBits);
+  SET_ATTR_VALUE(WGL_ACCUM_ALPHA_BITS_ARB, mode->accumAlphaBits);
+  SET_ATTR_VALUE(WGL_DEPTH_BITS_ARB, mode->depthBits);
+  SET_ATTR_VALUE(WGL_STENCIL_BITS_ARB, mode->stencilBits);
+  SET_ATTR_VALUE(WGL_AUX_BUFFERS_ARB, mode->numAuxBuffers);
+
+  if (mode->doubleBufferMode)
+    SET_ATTR_VALUE(WGL_DOUBLE_BUFFER_ARB, TRUE);
+
+  if (mode->stereoMode)
+    SET_ATTR_VALUE(WGL_STEREO_ARB, TRUE);
+
+  // Some attributes are only added to the list if the value requested is not 'don't care', as exactly matching that is daft..
+  if (mode->swapMethod == GLX_SWAP_EXCHANGE_OML)
+    SET_ATTR_VALUE(WGL_SWAP_METHOD_ARB, WGL_SWAP_EXCHANGE_ARB);
+
+  if (mode->swapMethod == GLX_SWAP_COPY_OML)
+    SET_ATTR_VALUE(WGL_SWAP_COPY_ARB, TRUE);
+
+  // XXX: this should probably be the other way around, but that messes up drawableTypeOverride
+  if (mode->visualRating == GLX_SLOW_VISUAL_EXT)
+    SET_ATTR_VALUE(WGL_ACCELERATION_ARB, WGL_NO_ACCELERATION_ARB);
+
+  // must support all the drawable types the mode supports
+  if ((mode->drawableType | drawableTypeOverride) & GLX_WINDOW_BIT)
+    SET_ATTR_VALUE(WGL_DRAW_TO_WINDOW_ARB,TRUE);
+
+  // XXX: this is a horrible hacky heuristic, in fact this whole drawableTypeOverride thing is a bad idea
+  // try to avoid asking for formats which don't exist (by not asking for all when adjusting the config to include the drawableTypeOverride)
+  if (drawableTypeOverride == GLX_WINDOW_BIT)
+    {
+      if (mode->drawableType & GLX_PIXMAP_BIT)
+        SET_ATTR_VALUE(WGL_DRAW_TO_BITMAP_ARB, TRUE);
+
+      if (mode->drawableType & GLX_PBUFFER_BIT)
+        if (winScreen->has_WGL_ARB_pbuffer)
+          SET_ATTR_VALUE(WGL_DRAW_TO_PBUFFER_ARB, TRUE);
+    }
+  else
+    {
+      if (drawableTypeOverride & GLX_PIXMAP_BIT)
+        SET_ATTR_VALUE(WGL_DRAW_TO_BITMAP_ARB, TRUE);
+
+      if (drawableTypeOverride & GLX_PBUFFER_BIT)
+        if (winScreen->has_WGL_ARB_pbuffer)
+          SET_ATTR_VALUE(WGL_DRAW_TO_PBUFFER_ARB, TRUE);
+    }
+
+  SET_ATTR_VALUE(0, 0); // terminator
+
+  /* choose the first match */
+  {
+    int pixelFormatIndex;
+
+    if (!wglChoosePixelFormatARBWrapper(hdc, attribList, NULL, 1, &pixelFormatIndex, &numFormats))
+      {
+        ErrorF("wglChoosePixelFormat error: %s\n", glxWinErrorMessage());
+      }
+    else
+      {
+        if (numFormats > 0)
+          {
+            GLWIN_DEBUG_MSG("wglChoosePixelFormat: chose pixelFormatIndex %d)", pixelFormatIndex);
+            return pixelFormatIndex;
+          }
+        else
+          ErrorF("wglChoosePixelFormat couldn't decide\n");
+      }
+  }
+
+  return 0;
+}
+
+/* ---------------------------------------------------------------------- */
+
+#define BITS_AND_SHIFT_TO_MASK(bits,mask) (((1<<(bits))-1) << (mask))
+
+//
+// Create the GLXconfigs using DescribePixelFormat()
+//
+static void
+glxWinCreateConfigs(HDC hdc, glxWinScreen *screen)
+{
+  GLXWinConfig *c, *result, *prev = NULL;
+  int numConfigs = 0;
+  int i = 0;
+  int n = 0;
+  PIXELFORMATDESCRIPTOR pfd;
+
+  GLWIN_DEBUG_MSG("glxWinCreateConfigs");
+
+  screen->base.numFBConfigs = 0;
+  screen->base.fbconfigs = NULL;
+
+  // get the number of pixelformats
+  numConfigs = DescribePixelFormat(hdc, 1, sizeof(PIXELFORMATDESCRIPTOR), NULL);
+  GLWIN_DEBUG_MSG("DescribePixelFormat says %d possible pixel formats", numConfigs);
+
+  /* alloc */
+  result = xalloc(sizeof(GLXWinConfig) * numConfigs);
+
+  if (NULL == result)
+    {
+      return;
+    }
+
+  memset(result, 0, sizeof(GLXWinConfig) * numConfigs);
+  n = 0;
+
+  /* fill in configs */
+  for (i = 0;  i < numConfigs; i++)
+    {
+      int rc;
+
+      c = &(result[i]);
+      c->base.next = NULL;
+      c->pixelFormatIndex = i+1;
+
+      rc = DescribePixelFormat(hdc, i+1, sizeof(PIXELFORMATDESCRIPTOR), &pfd);
+
+      if (!rc)
+        {
+          ErrorF("DescribePixelFormat failed for index %d, error %s\n", i+1, glxWinErrorMessage());
+          break;
+        }
+
+#ifdef _DEBUG
+      if (glxWinDebugSettings.dumpPFD)
+        pfdOut(&pfd);
+#endif
+
+      if (!(pfd.dwFlags & (PFD_DRAW_TO_WINDOW | PFD_DRAW_TO_BITMAP)) || !(pfd.dwFlags & PFD_SUPPORT_OPENGL))
+        {
+          GLWIN_DEBUG_MSG("pixelFormat %d has unsuitable flags 0x%08lx, skipping", i+1, pfd.dwFlags);
+          continue;
+        }
+
+      c->base.doubleBufferMode = (pfd.dwFlags & PFD_DOUBLEBUFFER) ? GL_TRUE : GL_FALSE;
+      c->base.stereoMode = (pfd.dwFlags & PFD_STEREO) ? GL_TRUE : GL_FALSE;
+
+      c->base.redBits = pfd.cRedBits;
+      c->base.greenBits = pfd.cGreenBits;
+      c->base.blueBits = pfd.cBlueBits;
+      c->base.alphaBits = pfd.cAlphaBits;
+
+      c->base.redMask = BITS_AND_SHIFT_TO_MASK(pfd.cRedBits, pfd.cRedShift);
+      c->base.greenMask =  BITS_AND_SHIFT_TO_MASK(pfd.cGreenBits, pfd.cGreenShift);
+      c->base.blueMask = BITS_AND_SHIFT_TO_MASK(pfd.cBlueBits, pfd.cBlueShift);
+      c->base.alphaMask = BITS_AND_SHIFT_TO_MASK(pfd.cAlphaBits, pfd.cAlphaShift);
+
+      c->base.rgbBits = pfd.cColorBits;
+
+      if (pfd.iPixelType == PFD_TYPE_COLORINDEX)
+        {
+          c->base.indexBits = pfd.cColorBits;
+        }
+      else
+        {
+          c->base.indexBits = 0;
+        }
+
+      c->base.accumRedBits = pfd.cAccumRedBits;
+      c->base.accumGreenBits = pfd.cAccumGreenBits;
+      c->base.accumBlueBits = pfd.cAccumBlueBits;
+      c->base.accumAlphaBits = pfd.cAccumAlphaBits;
+      //  pfd.cAccumBits;
+
+      c->base.depthBits = pfd.cDepthBits;
+      c->base.stencilBits = pfd.cStencilBits;
+      c->base.numAuxBuffers = pfd.cAuxBuffers;
+
+      // pfd.iLayerType; // ignored
+      c->base.level = 0;
+      // pfd.dwLayerMask; // ignored
+      // pfd.dwDamageMask;  // ignored
+
+      c->base.pixmapMode = 0;
+      c->base.visualID = -1;  // will be set by __glXScreenInit()
+
+      /* EXT_visual_rating / GLX 1.2 */
+      if (pfd.dwFlags & PFD_GENERIC_FORMAT)
+        {
+          c->base.visualRating = GLX_SLOW_VISUAL_EXT;
+        }
+      else
+        {
+          // PFD_GENERIC_ACCELERATED is not considered, so this may be MCD or ICD acclerated...
+          c->base.visualRating = GLX_NONE_EXT;
+        }
+
+      /* EXT_visual_info / GLX 1.2 */
+      if (pfd.iPixelType == PFD_TYPE_COLORINDEX)
+        {
+          c->base.visualType = GLX_STATIC_COLOR;
+        }
+      else
+        {
+          c->base.visualType = GLX_TRUE_COLOR;
+        }
+
+      // pfd.dwVisibleMask; ???
+      c->base.transparentPixel = GLX_NONE;
+      c->base.transparentRed = GLX_NONE;
+      c->base.transparentGreen = GLX_NONE;
+      c->base.transparentBlue = GLX_NONE;
+      c->base.transparentAlpha = GLX_NONE;
+      c->base.transparentIndex = GLX_NONE;
+
+      /* ARB_multisample / SGIS_multisample */
+      c->base.sampleBuffers = 0;
+      c->base.samples = 0;
+
+      /* SGIX_fbconfig / GLX 1.3 */
+      c->base.drawableType = (((pfd.dwFlags & PFD_DRAW_TO_WINDOW) ? GLX_WINDOW_BIT : 0)
+                         | ((pfd.dwFlags & PFD_DRAW_TO_BITMAP) ? GLX_PIXMAP_BIT : 0));
+
+      if (pfd.iPixelType == PFD_TYPE_COLORINDEX)
+        {
+          c->base.renderType = GLX_RGBA_BIT | GLX_COLOR_INDEX_BIT;
+        }
+      else
+        {
+          c->base.renderType = GLX_RGBA_BIT;
+        }
+
+      c->base.xRenderable = GL_TRUE;
+      c->base.fbconfigID = -1; // will be set by __glXScreenInit()
+
+      /* SGIX_pbuffer / GLX 1.3 */
+      // XXX: How can we find these values out ???
+      c->base.maxPbufferWidth = -1;
+      c->base.maxPbufferHeight = -1;
+      c->base.maxPbufferPixels = -1;
+      c->base.optimalPbufferWidth = 0; // there is no optimal value
+      c->base.optimalPbufferHeight = 0;
+
+      /* SGIX_visual_select_group */
+      // arrange for visuals with the best acceleration to be preferred in selection
+      switch (pfd.dwFlags & (PFD_GENERIC_FORMAT | PFD_GENERIC_ACCELERATED))
+        {
+        case 0:
+          c->base.visualSelectGroup = 2;
+          break;
+
+        case PFD_GENERIC_ACCELERATED:
+          c->base.visualSelectGroup = 1;
+          break;
+
+        case PFD_GENERIC_FORMAT:
+          c->base.visualSelectGroup = 0;
+          break;
+
+        default:
+          ;
+          // "can't happen"
+        }
+
+      /* OML_swap_method */
+      if (pfd.dwFlags & PFD_SWAP_EXCHANGE)
+        c->base.swapMethod = GLX_SWAP_EXCHANGE_OML;
+      else if (pfd.dwFlags & PFD_SWAP_COPY)
+        c->base.swapMethod = GLX_SWAP_COPY_OML;
+      else
+        c->base.swapMethod = GLX_SWAP_UNDEFINED_OML;
+
+      /* EXT_import_context */
+      c->base.screen = screen->base.pScreen->myNum;
+
+      /* EXT_texture_from_pixmap */
+      c->base.bindToTextureRgb = -1;
+      c->base.bindToTextureRgba = -1;
+      c->base.bindToMipmapTexture = -1;
+      c->base.bindToTextureTargets = -1;
+      c->base.yInverted = -1;
+
+      n++;
+
+      // update previous config to point to this config
+      if (prev)
+        prev->base.next = &(c->base);
+
+      prev = c;
+    }
+
+  GLWIN_DEBUG_MSG("found %d pixelFormats suitable for conversion to fbConfigs", n);
+
+  screen->base.numFBConfigs = n;
+  screen->base.fbconfigs = &(result->base);
+}
+
+// helper function to access an attribute value from an attribute value array by attribute
+static
+int getAttrValue(const int attrs[], int values[], unsigned int num, int attr, int fallback)
+{
+  unsigned int i;
+  for (i = 0; i < num; i++)
+    {
+      if (attrs[i] == attr)
+        {
+          GLWIN_TRACE_MSG("getAttrValue attr 0x%x, value %d", attr, values[i]);
+          return values[i];
+        }
+    }
+
+  ErrorF("getAttrValue failed to find attr 0x%x, using default value %d\n", attr, fallback);
+  return fallback;
+}
+
+//
+// Create the GLXconfigs using wglGetPixelFormatAttribfvARB() extension
+//
+static void
+glxWinCreateConfigsExt(HDC hdc, glxWinScreen *screen)
+{
+  GLXWinConfig *c, *result, *prev = NULL;
+  int i = 0;
+  int n = 0;
+
+  const int attr = WGL_NUMBER_PIXEL_FORMATS_ARB;
+  int numConfigs;
+
+  int attrs[50];
+  unsigned int num_attrs = 0;
+
+  GLWIN_DEBUG_MSG("glxWinCreateConfigsExt");
+
+  screen->base.numFBConfigs = 0;
+  screen->base.fbconfigs = NULL;
+
+  if (!wglGetPixelFormatAttribivARBWrapper(hdc, 0, 0, 1, &attr, &numConfigs))
+    {
+      ErrorF("wglGetPixelFormatAttribivARB failed for WGL_NUMBER_PIXEL_FORMATS_ARB: %s\n", glxWinErrorMessage());
+      return;
+    }
+
+  GLWIN_DEBUG_MSG("wglGetPixelFormatAttribivARB says %d possible pixel formats", numConfigs);
+
+  /* alloc */
+  result = xalloc(sizeof(GLXWinConfig) * numConfigs);
+
+  if (NULL == result)
+    {
+      return;
+    }
+
+  memset(result, 0, sizeof(GLXWinConfig) * numConfigs);
+  n = 0;
+
+#define ADD_ATTR(a) { attrs[num_attrs++] = a; assert(num_attrs < NUM_ELEMENTS(attrs)); }
+
+  ADD_ATTR(WGL_DRAW_TO_WINDOW_ARB);
+  ADD_ATTR(WGL_DRAW_TO_BITMAP_ARB);
+  ADD_ATTR(WGL_ACCELERATION_ARB);
+  ADD_ATTR(WGL_SWAP_LAYER_BUFFERS_ARB);
+  ADD_ATTR(WGL_NUMBER_OVERLAYS_ARB);
+  ADD_ATTR(WGL_NUMBER_UNDERLAYS_ARB);
+  ADD_ATTR(WGL_TRANSPARENT_ARB);
+  ADD_ATTR(WGL_TRANSPARENT_RED_VALUE_ARB);
+  ADD_ATTR(WGL_TRANSPARENT_GREEN_VALUE_ARB);
+  ADD_ATTR(WGL_TRANSPARENT_GREEN_VALUE_ARB);
+  ADD_ATTR(WGL_TRANSPARENT_ALPHA_VALUE_ARB);
+  ADD_ATTR(WGL_SUPPORT_OPENGL_ARB);
+  ADD_ATTR(WGL_DOUBLE_BUFFER_ARB);
+  ADD_ATTR(WGL_STEREO_ARB);
+  ADD_ATTR(WGL_PIXEL_TYPE_ARB);
+  ADD_ATTR(WGL_COLOR_BITS_ARB);
+  ADD_ATTR(WGL_RED_BITS_ARB);
+  ADD_ATTR(WGL_RED_SHIFT_ARB);
+  ADD_ATTR(WGL_GREEN_BITS_ARB);
+  ADD_ATTR(WGL_GREEN_SHIFT_ARB);
+  ADD_ATTR(WGL_BLUE_BITS_ARB);
+  ADD_ATTR(WGL_BLUE_SHIFT_ARB);
+  ADD_ATTR(WGL_ALPHA_BITS_ARB);
+  ADD_ATTR(WGL_ALPHA_SHIFT_ARB);
+  ADD_ATTR(WGL_ACCUM_RED_BITS_ARB);
+  ADD_ATTR(WGL_ACCUM_GREEN_BITS_ARB);
+  ADD_ATTR(WGL_ACCUM_BLUE_BITS_ARB);
+  ADD_ATTR(WGL_ACCUM_ALPHA_BITS_ARB);
+  ADD_ATTR(WGL_DEPTH_BITS_ARB);
+  ADD_ATTR(WGL_STENCIL_BITS_ARB);
+  ADD_ATTR(WGL_AUX_BUFFERS_ARB);
+  ADD_ATTR(WGL_SWAP_METHOD_ARB);
+
+  if (screen->has_WGL_ARB_multisample)
+    {
+      // we may not query these attrs if WGL_ARB_multisample is not offered
+      ADD_ATTR(WGL_SAMPLE_BUFFERS_ARB);
+      ADD_ATTR(WGL_SAMPLES_ARB);
+    }
+
+  if (screen->has_WGL_ARB_render_texture)
+    {
+      // we may not query these attrs if WGL_ARB_render_texture is not offered
+      ADD_ATTR(WGL_BIND_TO_TEXTURE_RGB_ARB);
+      ADD_ATTR(WGL_BIND_TO_TEXTURE_RGBA_ARB);
+    }
+
+  if (screen->has_WGL_ARB_pbuffer)
+    {
+      // we may not query these attrs if WGL_ARB_pbuffer is not offered
+      ADD_ATTR(WGL_DRAW_TO_PBUFFER_ARB);
+      ADD_ATTR(WGL_MAX_PBUFFER_PIXELS_ARB);
+      ADD_ATTR(WGL_MAX_PBUFFER_WIDTH_ARB);
+      ADD_ATTR(WGL_MAX_PBUFFER_HEIGHT_ARB);
+    }
+
+  /* fill in configs */
+  for (i = 0;  i < numConfigs; i++)
+    {
+      int sizevalues=num_attrs*sizeof(int);
+      int *values=(int*)_alloca(sizevalues);
+
+      memset(values,0,sizevalues);
+
+      c = &(result[i]);
+      c->base.next = NULL;
+      c->pixelFormatIndex = i+1;
+
+      if (!wglGetPixelFormatAttribivARBWrapper(hdc, i+1, 0, num_attrs, attrs, values))
+        {
+          ErrorF("wglGetPixelFormatAttribivARB failed for index %d, error %s\n", i+1, glxWinErrorMessage());
+          break;
+        }
+
+#define ATTR_VALUE(a, d) getAttrValue(attrs, values, num_attrs, (a), (d))
+
+      if (!ATTR_VALUE(WGL_SUPPORT_OPENGL_ARB, 0))
+        {
+          GLWIN_DEBUG_MSG("pixelFormat %d isn't WGL_SUPPORT_OPENGL_ARB, skipping", i+1);
+          continue;
+        }
+
+      c->base.doubleBufferMode = ATTR_VALUE(WGL_DOUBLE_BUFFER_ARB, 0) ? GL_TRUE : GL_FALSE;
+      c->base.stereoMode = ATTR_VALUE(WGL_STEREO_ARB, 0) ? GL_TRUE : GL_FALSE;
+
+      c->base.redBits = ATTR_VALUE(WGL_RED_BITS_ARB, 0);
+      c->base.greenBits = ATTR_VALUE(WGL_GREEN_BITS_ARB, 0);
+      c->base.blueBits = ATTR_VALUE(WGL_BLUE_BITS_ARB, 0);
+      c->base.alphaBits = ATTR_VALUE(WGL_ALPHA_BITS_ARB, 0);
+
+      c->base.redMask = BITS_AND_SHIFT_TO_MASK(c->base.redBits, ATTR_VALUE(WGL_RED_SHIFT_ARB, 0));
+      c->base.greenMask = BITS_AND_SHIFT_TO_MASK(c->base.greenBits, ATTR_VALUE(WGL_GREEN_SHIFT_ARB, 0));
+      c->base.blueMask = BITS_AND_SHIFT_TO_MASK(c->base.blueBits, ATTR_VALUE(WGL_BLUE_SHIFT_ARB, 0));
+      c->base.alphaMask = BITS_AND_SHIFT_TO_MASK(c->base.alphaBits, ATTR_VALUE(WGL_ALPHA_SHIFT_ARB, 0));
+
+      switch (ATTR_VALUE(WGL_PIXEL_TYPE_ARB, 0))
+        {
+        case WGL_TYPE_COLORINDEX_ARB:
+          c->base.indexBits = ATTR_VALUE(WGL_COLOR_BITS_ARB, 0);
+          c->base.rgbBits = 0;
+          c->base.visualType = GLX_STATIC_COLOR;
+          break;
+
+        case WGL_TYPE_RGBA_FLOAT_ARB:
+          GLWIN_DEBUG_MSG("pixelFormat %d is WGL_TYPE_RGBA_FLOAT_ARB, skipping", i+1);
+          continue;
+
+        case WGL_TYPE_RGBA_UNSIGNED_FLOAT_EXT:
+          GLWIN_DEBUG_MSG("pixelFormat %d is WGL_TYPE_RGBA_UNSIGNED_FLOAT_EXT, skipping", i+1);
+          continue;
+
+        case WGL_TYPE_RGBA_ARB:
+          c->base.indexBits = 0;
+          c->base.rgbBits = ATTR_VALUE(WGL_COLOR_BITS_ARB, 0);
+          c->base.visualType = GLX_TRUE_COLOR;
+          break;
+
+        default:
+          ErrorF("wglGetPixelFormatAttribivARB returned unknown value 0x%x for WGL_PIXEL_TYPE_ARB\n", ATTR_VALUE(WGL_PIXEL_TYPE_ARB, 0));
+          continue;
+        }
+
+      c->base.accumRedBits = ATTR_VALUE(WGL_ACCUM_RED_BITS_ARB, 0);
+      c->base.accumGreenBits = ATTR_VALUE(WGL_ACCUM_GREEN_BITS_ARB, 0);
+      c->base.accumBlueBits = ATTR_VALUE(WGL_ACCUM_BLUE_BITS_ARB, 0);
+      c->base.accumAlphaBits = ATTR_VALUE(WGL_ACCUM_ALPHA_BITS_ARB, 0);
+
+      c->base.depthBits = ATTR_VALUE(WGL_DEPTH_BITS_ARB, 0);
+      c->base.stencilBits = ATTR_VALUE(WGL_STENCIL_BITS_ARB, 0);
+      c->base.numAuxBuffers = ATTR_VALUE(WGL_AUX_BUFFERS_ARB, 0);
+
+      {
+        int layers = ATTR_VALUE(WGL_NUMBER_OVERLAYS_ARB,0) + ATTR_VALUE(WGL_NUMBER_UNDERLAYS_ARB, 0);
+
+        if (layers > 0)
+          {
+            ErrorF("pixelFormat %d: has %d overlay, %d underlays which aren't currently handled", i, ATTR_VALUE(WGL_NUMBER_OVERLAYS_ARB,0), ATTR_VALUE(WGL_NUMBER_UNDERLAYS_ARB, 0));
+            // XXX: need to iterate over layers?
+          }
+      }
+      c->base.level = 0;
+
+      c->base.pixmapMode = 0; // ???
+      c->base.visualID = -1;  // will be set by __glXScreenInit()
+
+      /* EXT_visual_rating / GLX 1.2 */
+      switch (ATTR_VALUE(WGL_ACCELERATION_ARB, 0))
+        {
+        default:
+          ErrorF("wglGetPixelFormatAttribivARB returned unknown value 0x%x for WGL_ACCELERATION_ARB\n", ATTR_VALUE(WGL_ACCELERATION_ARB, 0));
+
+        case WGL_NO_ACCELERATION_ARB:
+          c->base.visualRating = GLX_SLOW_VISUAL_EXT;
+          break;
+
+        case WGL_GENERIC_ACCELERATION_ARB:
+        case WGL_FULL_ACCELERATION_ARB:
+          c->base.visualRating = GLX_NONE_EXT;
+          break;
+        }
+
+      /* EXT_visual_info / GLX 1.2 */
+      // c->base.visualType is set above
+      if (ATTR_VALUE(WGL_TRANSPARENT_ARB, 0))
+        {
+          c->base.transparentPixel = (c->base.visualType == GLX_TRUE_COLOR) ? GLX_TRANSPARENT_RGB_EXT : GLX_TRANSPARENT_INDEX_EXT;
+          c->base.transparentRed = ATTR_VALUE(WGL_TRANSPARENT_RED_VALUE_ARB, 0);
+          c->base.transparentGreen = ATTR_VALUE(WGL_TRANSPARENT_GREEN_VALUE_ARB, 0);
+          c->base.transparentBlue = ATTR_VALUE(WGL_TRANSPARENT_BLUE_VALUE_ARB, 0);
+          c->base.transparentAlpha = ATTR_VALUE(WGL_TRANSPARENT_ALPHA_VALUE_ARB, 0);
+          c->base.transparentIndex = ATTR_VALUE(WGL_TRANSPARENT_INDEX_VALUE_ARB, 0);
+        }
+      else
+        {
+          c->base.transparentPixel = GLX_NONE_EXT;
+          c->base.transparentRed = GLX_NONE;
+          c->base.transparentGreen = GLX_NONE;
+          c->base.transparentBlue = GLX_NONE;
+          c->base.transparentAlpha = GLX_NONE;
+          c->base.transparentIndex = GLX_NONE;
+        }
+
+      /* ARB_multisample / SGIS_multisample */
+      if (screen->has_WGL_ARB_multisample)
+        {
+          c->base.sampleBuffers = ATTR_VALUE(WGL_SAMPLE_BUFFERS_ARB, 0);
+          c->base.samples = ATTR_VALUE(WGL_SAMPLES_ARB, 0);
+        }
+      else
+        {
+          c->base.sampleBuffers = 0;
+          c->base.samples = 0;
+        }
+
+      /* SGIX_fbconfig / GLX 1.3 */
+      c->base.drawableType = ((ATTR_VALUE(WGL_DRAW_TO_WINDOW_ARB, 0) ? GLX_WINDOW_BIT : 0)
+                         | (ATTR_VALUE(WGL_DRAW_TO_BITMAP_ARB, 0) ? GLX_PIXMAP_BIT : 0)
+                         | (ATTR_VALUE(WGL_DRAW_TO_PBUFFER_ARB, 0) ? GLX_PBUFFER_BIT : 0));
+
+      /*
+        Assume OpenGL RGBA rendering is available on all visuals
+        (it is specified to render to red component in single-channel visuals,
+        if supported, but there doesn't seem to be any mechanism to check if it
+        is supported)
+
+        Color index rendering is only supported on single-channel visuals
+      */
+      if (c->base.visualType == GLX_STATIC_COLOR)
+        {
+          c->base.renderType = GLX_RGBA_BIT | GLX_COLOR_INDEX_BIT;
+        }
+      else
+        {
+          c->base.renderType = GLX_RGBA_BIT;
+        }
+
+      c->base.xRenderable = GL_TRUE;
+      c->base.fbconfigID = -1; // will be set by __glXScreenInit()
+
+      /* SGIX_pbuffer / GLX 1.3 */
+      if (screen->has_WGL_ARB_pbuffer)
+        {
+          c->base.maxPbufferWidth = ATTR_VALUE(WGL_MAX_PBUFFER_WIDTH_ARB, -1);
+          c->base.maxPbufferHeight = ATTR_VALUE(WGL_MAX_PBUFFER_HEIGHT_ARB, -1);
+          c->base.maxPbufferPixels =  ATTR_VALUE(WGL_MAX_PBUFFER_PIXELS_ARB, -1);
+        }
+      else
+        {
+          c->base.maxPbufferWidth = -1;
+          c->base.maxPbufferHeight = -1;
+          c->base.maxPbufferPixels =  -1;
+        }
+      c->base.optimalPbufferWidth = 0; // there is no optimal value
+      c->base.optimalPbufferHeight = 0;
+
+      /* SGIX_visual_select_group */
+      // arrange for visuals with the best acceleration to be preferred in selection
+      switch (ATTR_VALUE(WGL_ACCELERATION_ARB, 0))
+        {
+        case WGL_FULL_ACCELERATION_ARB:
+          c->base.visualSelectGroup = 2;
+          break;
+
+        case WGL_GENERIC_ACCELERATION_ARB:
+          c->base.visualSelectGroup = 1;
+          break;
+
+        default:
+        case WGL_NO_ACCELERATION_ARB:
+          c->base.visualSelectGroup = 0;
+          break;
+        }
+
+      /* OML_swap_method */
+      switch (ATTR_VALUE(WGL_SWAP_METHOD_ARB, 0))
+        {
+        case WGL_SWAP_EXCHANGE_ARB:
+          c->base.swapMethod = GLX_SWAP_EXCHANGE_OML;
+          break;
+
+        case WGL_SWAP_COPY_ARB:
+          c->base.swapMethod = GLX_SWAP_COPY_OML;
+          break;
+
+        default:
+          ErrorF("wglGetPixelFormatAttribivARB returned unknown value 0x%x for WGL_SWAP_METHOD_ARB\n", ATTR_VALUE(WGL_SWAP_METHOD_ARB, 0));
+
+        case WGL_SWAP_UNDEFINED_ARB:
+          c->base.swapMethod = GLX_SWAP_UNDEFINED_OML;
+        }
+
+      /* EXT_import_context */
+      c->base.screen = screen->base.pScreen->myNum;
+
+      /* EXT_texture_from_pixmap */
+      /*
+         Mesa's DRI configs always have bindToTextureRgb/Rgba TRUE (see driCreateConfigs(), so setting
+         bindToTextureRgb/bindToTextureRgba to FALSE means that swrast can't find any fbConfigs to use,
+         so setting these to 0, even if we know bindToTexture isn't available, isn't a good idea...
+       */
+      if (screen->has_WGL_ARB_render_texture)
+        {
+          c->base.bindToTextureRgb = ATTR_VALUE(WGL_BIND_TO_TEXTURE_RGB_ARB, -1);
+          c->base.bindToTextureRgba = ATTR_VALUE(WGL_BIND_TO_TEXTURE_RGBA_ARB, -1);
+        }
+      else
+        {
+          c->base.bindToTextureRgb = -1;
+          c->base.bindToTextureRgba = -1;
+        }
+      c->base.bindToMipmapTexture = -1;
+      c->base.bindToTextureTargets = GLX_TEXTURE_1D_BIT_EXT | GLX_TEXTURE_2D_BIT_EXT | GLX_TEXTURE_RECTANGLE_BIT_EXT;
+      c->base.yInverted = -1;
+
+      n++;
+
+      // update previous config to point to this config
+      if (prev)
+        prev->base.next = &(c->base);
+
+      prev = c;
+    }
+
+  screen->base.numFBConfigs = n;
+  screen->base.fbconfigs = &(result->base);
+}