Imported nx-X11-3.1.0-1.tar.gznx-X11/3.1.0-1

Summary: Imported nx-X11-3.1.0-1.tar.gz
Keywords:

Imported nx-X11-3.1.0-1.tar.gz
into Git repository

1 files changed, 1380 insertions, 0 deletions

diff --git a/nx-X11/programs/Xserver/GL/apple/indirect.c b/nx-X11/programs/Xserver/GL/apple/indirect.c
new file mode 100644
index 000000000..448b1f76a
--- /dev/null
+++ b/nx-X11/programs/Xserver/GL/apple/indirect.c
@@ -0,0 +1,1380 @@
+/*
+ * GLX implementation that uses Apple's OpenGL.framework
+ * (Indirect rendering path)
+ */
+/*
+ * Copyright (c) 2002 Greg Parker. All Rights Reserved.
+ * Copyright (c) 2002 Apple Computer, Inc.
+ * Copyright (c) 2004 Torrey T. Lyons. 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.
+ */
+/* $XFree86: xc/programs/Xserver/GL/apple/indirect.c,v 1.2 2003/09/16 00:36:11 torrey Exp $ */
+
+#ifdef HAVE_DIX_CONFIG_H
+#include <dix-config.h>
+#endif
+
+#include "dri.h"
+#include "quartz.h"
+
+#include <CoreGraphics/CoreGraphics.h>
+#include <OpenGL/OpenGL.h>
+#include <OpenGL/CGLContext.h>
+
+// X11 and X11's glx
+#include <miscstruct.h>
+#include <windowstr.h>
+#include <resource.h>
+#include <GL/glxint.h>
+#include <GL/glxtokens.h>
+#include <scrnintstr.h>
+#include <glxserver.h>
+#include <glxscreens.h>
+#include <glxdrawable.h>
+#include <glxcontext.h>
+#include <glxext.h>
+#include <glxutil.h>
+#include <glxscreens.h>
+#include <GL/internal/glcore.h>
+#include "x-hash.h"
+#include "x-list.h"
+
+#include "glcontextmodes.h"
+
+// ggs: needed to call back to glx with visual configs
+extern void GlxSetVisualConfigs(int nconfigs, __GLXvisualConfig *configs, void **configprivs);
+
+
+// Write debugging output, or not
+#ifdef GLAQUA_DEBUG
+#define GLAQUA_DEBUG_MSG ErrorF
+#else
+#define GLAQUA_DEBUG_MSG(a, ...)
+#endif
+
+
+// The following GL functions don't have an EXT suffix in OpenGL.framework.
+GLboolean glAreTexturesResidentEXT(GLsizei a, const GLuint *b, GLboolean *c) {
+    return glAreTexturesResident(a, b, c);
+}
+void glDeleteTexturesEXT(GLsizei d, const GLuint *e) {
+    glDeleteTextures(d, e);
+}
+void glGenTexturesEXT(GLsizei f, GLuint *g) {
+    glGenTextures(f, g);
+}
+GLboolean glIsTextureEXT(GLuint h) {
+    return glIsTexture(h);
+}
+
+// some prototypes
+static Bool glAquaScreenProbe(int screen);
+static Bool glAquaInitVisuals(VisualPtr *visualp, DepthPtr *depthp,
+                              int *nvisualp, int *ndepthp,
+                              int *rootDepthp, VisualID *defaultVisp,
+                              unsigned long sizes, int bitsPerRGB);
+static void glAquaSetVisualConfigs(int nconfigs, __GLXvisualConfig *configs,
+                                   void **privates);
+static __GLinterface *glAquaCreateContext(__GLimports *imports,
+                                          __GLcontextModes *mode,
+                                          __GLinterface *shareGC);
+static void glAquaCreateBuffer(__GLXdrawablePrivate *glxPriv);
+static void glAquaResetExtension(void);
+
+/*
+ * This structure is statically allocated in the __glXScreens[]
+ * structure.  This struct is not used anywhere other than in
+ * __glXScreenInit to initialize each of the active screens
+ * (__glXActiveScreens[]).  Several of the fields must be initialized by
+ * the screenProbe routine before they are copied to the active screens
+ * struct.  In particular, the contextCreate, modes, numVisuals,
+ * and numUsableVisuals fields must be initialized.
+ */
+static __GLXscreenInfo __glDDXScreenInfo = {
+    glAquaScreenProbe,   /* Must be generic and handle all screens */
+    glAquaCreateContext, /* Substitute screen's createContext routine */
+    glAquaCreateBuffer,  /* Substitute screen's createBuffer routine */
+    NULL,                 /* Set up modes in probe */
+    NULL,                 /* Set up pVisualPriv in probe */
+    0,                    /* Set up numVisuals in probe */
+    0,                    /* Set up numUsableVisuals in probe */
+    "Vendor String",      /* GLXvendor is overwritten by __glXScreenInit */
+    "Version String",     /* GLXversion is overwritten by __glXScreenInit */
+    "Extensions String",  /* GLXextensions is overwritten by __glXScreenInit */
+    NULL                  /* WrappedPositionWindow is overwritten */
+};
+
+void *__glXglDDXScreenInfo(void) {
+    return &__glDDXScreenInfo;
+}
+
+static __GLXextensionInfo __glDDXExtensionInfo = {
+    GL_CORE_APPLE,
+    glAquaResetExtension,
+    glAquaInitVisuals,
+    glAquaSetVisualConfigs
+};
+
+void *__glXglDDXExtensionInfo(void) {
+    return &__glDDXExtensionInfo;
+}
+
+// prototypes
+
+static GLboolean glAquaDestroyContext(__GLcontext *gc);
+static GLboolean glAquaLoseCurrent(__GLcontext *gc);
+static GLboolean glAquaMakeCurrent(__GLcontext *gc);
+static GLboolean glAquaShareContext(__GLcontext *gc, __GLcontext *gcShare);
+static GLboolean glAquaCopyContext(__GLcontext *dst, const __GLcontext *src,
+                                    GLuint mask);
+static GLboolean glAquaForceCurrent(__GLcontext *gc);
+
+/* Drawing surface notification callbacks */
+static GLboolean glAquaNotifyResize(__GLcontext *gc);
+static void glAquaNotifyDestroy(__GLcontext *gc);
+static void glAquaNotifySwapBuffers(__GLcontext *gc);
+
+/* Dispatch table override control for external agents like libGLS */
+static struct __GLdispatchStateRec* glAquaDispatchExec(__GLcontext *gc);
+static void glAquaBeginDispatchOverride(__GLcontext *gc);
+static void glAquaEndDispatchOverride(__GLcontext *gc);
+
+static __GLexports glAquaExports = {
+    glAquaDestroyContext,
+    glAquaLoseCurrent,
+    glAquaMakeCurrent,
+    glAquaShareContext,
+    glAquaCopyContext,
+    glAquaForceCurrent,
+
+    glAquaNotifyResize,
+    glAquaNotifyDestroy,
+    glAquaNotifySwapBuffers,
+
+    glAquaDispatchExec,
+    glAquaBeginDispatchOverride,
+    glAquaEndDispatchOverride
+};
+
+typedef struct {
+    int num_vis;
+    __GLcontextModes *modes;
+    void **priv;
+
+    // wrapped screen functions
+    RealizeWindowProcPtr RealizeWindow;
+    UnrealizeWindowProcPtr UnrealizeWindow;
+} glAquaScreenRec;
+
+static glAquaScreenRec glAquaScreens[MAXSCREENS];
+
+// __GLdrawablePrivate->private
+typedef struct {
+    DrawablePtr pDraw;
+    xp_surface_id sid;
+} GLAquaDrawableRec;
+
+struct __GLcontextRec {
+    struct __GLinterfaceRec interface; // required to be first
+
+    CGLContextObj ctx;
+    CGLPixelFormatObj pixelFormat;
+
+    /* set when attached */
+    xp_surface_id sid;
+
+    unsigned isAttached :1;
+};
+
+/* maps from surface id -> list of __GLcontext */
+static x_hash_table *surface_hash;
+
+
+// Context manipulation; return GL_FALSE on failure
+static GLboolean glAquaDestroyContext(__GLcontext *gc)
+{
+    x_list *lst;
+
+    GLAQUA_DEBUG_MSG("glAquaDestroyContext (ctx 0x%x)\n",
+                     (unsigned int) gc->ctx);
+
+    if (gc != NULL)
+    {
+        if (gc->sid != 0 && surface_hash != NULL)
+        {
+            lst = x_hash_table_lookup(surface_hash, (void *) gc->sid, NULL);
+            lst = x_list_remove(lst, gc);
+            x_hash_table_insert(surface_hash, (void *) gc->sid, lst);
+        }
+
+        if (gc->ctx != NULL)
+            CGLDestroyContext(gc->ctx);
+
+        if (gc->pixelFormat != NULL)
+            CGLDestroyPixelFormat(gc->pixelFormat);
+
+        free(gc);
+    }
+
+    return GL_TRUE;
+}
+
+static GLboolean glAquaLoseCurrent(__GLcontext *gc)
+{
+    CGLError gl_err;
+
+    GLAQUA_DEBUG_MSG("glAquaLoseCurrent (ctx 0x%x)\n", (unsigned int) gc->ctx);
+
+    gl_err = CGLSetCurrentContext(NULL);
+    if (gl_err != 0)
+        ErrorF("CGLSetCurrentContext error: %s\n", CGLErrorString(gl_err));
+
+    __glXLastContext = NULL; // Mesa does this; why?
+
+    return GL_TRUE;
+}
+
+/* Called when a surface is destroyed as a side effect of destroying
+   the window it's attached to. */
+static void surface_notify(void *_arg, void *data)
+{
+    DRISurfaceNotifyArg *arg = _arg;
+    GLAquaDrawableRec *aquaPriv = data;
+    __GLcontext *gc;
+    x_list *lst;
+
+    switch (arg->kind)
+    {
+    case AppleDRISurfaceNotifyDestroyed:
+        if (surface_hash != NULL)
+            x_hash_table_remove(surface_hash, (void *) arg->id);
+
+        aquaPriv->pDraw = NULL;
+        aquaPriv->sid = 0;
+        break;
+
+    case AppleDRISurfaceNotifyChanged:
+        if (surface_hash != NULL)
+        {
+            lst = x_hash_table_lookup(surface_hash, (void *) arg->id, NULL);
+            for (; lst != NULL; lst = lst->next)
+            {
+                gc = lst->data;
+                xp_update_gl_context(gc->ctx);
+            }
+        }
+        break;
+    }
+}
+
+static void unattach(__GLcontext *gc)
+{
+    x_list *lst;
+
+    if (gc->isAttached)
+    {
+        GLAQUA_DEBUG_MSG("unattaching\n");
+
+        if (surface_hash != NULL)
+        {
+            lst = x_hash_table_lookup(surface_hash, (void *) gc->sid, NULL);
+            lst = x_list_remove(lst, gc);
+            x_hash_table_insert(surface_hash, (void *) gc->sid, lst);
+        }
+
+        CGLClearDrawable(gc->ctx);
+        gc->isAttached = FALSE;
+        gc->sid = 0;
+    }
+}
+
+static void attach(__GLcontext *gc, __GLdrawablePrivate *glPriv)
+{
+    __GLXdrawablePrivate *glxPriv;
+    GLAquaDrawableRec *aquaPriv;
+    DrawablePtr pDraw;
+
+    glxPriv = (__GLXdrawablePrivate *)glPriv->other;
+    aquaPriv = (GLAquaDrawableRec *)glPriv->private;
+    pDraw = glxPriv->pDraw;
+
+    if (aquaPriv->sid == 0)
+    {
+        if (!quartzProcs->CreateSurface(pDraw->pScreen, pDraw->id, pDraw,
+                                        0, &aquaPriv->sid, NULL,
+                                        surface_notify, aquaPriv))
+        {
+            return;
+        }
+        aquaPriv->pDraw = pDraw;
+    }
+
+    if (!gc->isAttached || gc->sid != aquaPriv->sid)
+    {
+        x_list *lst;
+
+        if (xp_attach_gl_context(gc->ctx, aquaPriv->sid) != Success)
+        {
+            quartzProcs->DestroySurface(pDraw->pScreen, pDraw->id, pDraw,
+                                        surface_notify, aquaPriv);
+            if (surface_hash != NULL)
+                x_hash_table_remove(surface_hash, (void *) aquaPriv->sid);
+
+            aquaPriv->sid = 0;
+            return;
+        }
+
+        gc->isAttached = TRUE;
+        gc->sid = aquaPriv->sid;
+
+        if (surface_hash == NULL)
+            surface_hash = x_hash_table_new(NULL, NULL, NULL, NULL);
+
+        lst = x_hash_table_lookup(surface_hash, (void *) gc->sid, NULL);
+        if (x_list_find(lst, gc) == NULL)
+        {
+            lst = x_list_prepend(lst, gc);
+            x_hash_table_insert(surface_hash, (void *) gc->sid, lst);
+        }
+
+        GLAQUA_DEBUG_MSG("attached 0x%x to 0x%x\n", (unsigned int) pDraw->id,
+                         (unsigned int) aquaPriv->sid);
+    }
+}
+
+static GLboolean glAquaMakeCurrent(__GLcontext *gc)
+{
+    __GLdrawablePrivate *glPriv = gc->interface.imports.getDrawablePrivate(gc);
+    CGLError gl_err;
+
+    GLAQUA_DEBUG_MSG("glAquaMakeCurrent (ctx 0x%x)\n", (unsigned int) gc->ctx);
+
+    attach(gc, glPriv);
+
+    gl_err = CGLSetCurrentContext(gc->ctx);
+    if (gl_err != 0)
+        ErrorF("CGLSetCurrentContext error: %s\n", CGLErrorString(gl_err));
+
+    return gl_err == 0;
+}
+
+static GLboolean glAquaShareContext(__GLcontext *gc, __GLcontext *gcShare)
+{
+  GLAQUA_DEBUG_MSG("glAquaShareContext unimplemented\n");
+
+  return GL_TRUE;
+}
+
+static GLboolean glAquaCopyContext(__GLcontext *dst, const __GLcontext *src,
+                                   GLuint mask)
+{
+    CGLError gl_err;
+
+    GLAQUA_DEBUG_MSG("glAquaCopyContext\n");
+
+    gl_err = CGLCopyContext(src->ctx, dst->ctx, mask);
+    if (gl_err != 0)
+        ErrorF("CGLCopyContext error: %s\n", CGLErrorString(gl_err));
+
+    return gl_err == 0;
+}
+
+static GLboolean glAquaForceCurrent(__GLcontext *gc)
+{
+    CGLError gl_err;
+
+    GLAQUA_DEBUG_MSG("glAquaForceCurrent (ctx 0x%x)\n",
+                     (unsigned int) gc->ctx);
+
+    gl_err = CGLSetCurrentContext(gc->ctx);
+    if (gl_err != 0)
+        ErrorF("CGLSetCurrentContext error: %s\n", CGLErrorString(gl_err));
+
+    return gl_err == 0;
+}
+
+/* Drawing surface notification callbacks */
+
+static GLboolean glAquaNotifyResize(__GLcontext *gc)
+{
+    GLAQUA_DEBUG_MSG("unimplemented glAquaNotifyResize");
+    return GL_TRUE;
+}
+
+static void glAquaNotifyDestroy(__GLcontext *gc)
+{
+    GLAQUA_DEBUG_MSG("unimplemented glAquaNotifyDestroy");
+}
+
+static void glAquaNotifySwapBuffers(__GLcontext *gc)
+{
+    GLAQUA_DEBUG_MSG("unimplemented glAquaNotifySwapBuffers");
+}
+
+/* Dispatch table override control for external agents like libGLS */
+static struct __GLdispatchStateRec* glAquaDispatchExec(__GLcontext *gc)
+{
+    GLAQUA_DEBUG_MSG("unimplemented glAquaDispatchExec");
+    return NULL;
+}
+
+static void glAquaBeginDispatchOverride(__GLcontext *gc)
+{
+    GLAQUA_DEBUG_MSG("unimplemented glAquaBeginDispatchOverride");
+}
+
+static void glAquaEndDispatchOverride(__GLcontext *gc)
+{
+    GLAQUA_DEBUG_MSG("unimplemented glAquaEndDispatchOverride");
+}
+
+static CGLPixelFormatObj makeFormat(__GLcontextModes *mode)
+{
+    int i;
+    CGLPixelFormatAttribute attr[64]; // currently uses max of 30
+    CGLPixelFormatObj result;
+    long n_formats;
+    CGLError gl_err;
+    
+    GLAQUA_DEBUG_MSG("makeFormat\n");
+
+    if (!mode->rgbMode)
+        return NULL;
+
+    i = 0;
+
+    // attr [i++] = kCGLPFAAcelerated; // require hwaccel - BAD for multiscreen
+    // attr [i++] = kCGLPFANoRecovery; // disable fallback renderers - BAD
+
+    if (mode->stereoMode) {
+        attr[i++] = kCGLPFAStereo;
+    }
+    if (mode->doubleBufferMode) {
+        attr[i++] = kCGLPFADoubleBuffer;
+    }
+
+    if (mode->colorIndexMode) {
+        /* ignored */
+    }
+
+    if (mode->rgbMode) {
+        attr[i++] = kCGLPFAColorSize;
+        attr[i++] = mode->redBits + mode->greenBits + mode->blueBits;
+        attr[i++] = kCGLPFAAlphaSize;
+        attr[i++] = 1; /* FIXME: ignoring mode->alphaBits which is always 0 */
+    }
+
+    if (mode->haveAccumBuffer) {
+        attr[i++] = kCGLPFAAccumSize;
+        attr[i++] = mode->accumRedBits + mode->accumGreenBits
+                    + mode->accumBlueBits + mode->accumAlphaBits;
+    }
+    if (mode->haveDepthBuffer) {
+        attr[i++] = kCGLPFADepthSize;
+        attr[i++] = mode->depthBits;
+    }
+    if (mode->haveStencilBuffer) {
+        attr[i++] = kCGLPFAStencilSize;
+        attr[i++] = mode->stencilBits;
+    }
+
+    attr[i++] = kCGLPFAAuxBuffers;
+    attr[i++] = mode->numAuxBuffers;
+
+    /* mode->level ignored */
+
+    /* mode->pixmapMode ? */
+
+    attr[i++] = 0;
+
+    GLAQUA_DEBUG_MSG("makeFormat almost done\n");
+
+    result = NULL;
+    gl_err = CGLChoosePixelFormat(attr, &result, &n_formats);
+    if (gl_err != 0)
+        ErrorF("CGLChoosePixelFormat error: %s\n", CGLErrorString(gl_err));
+
+    GLAQUA_DEBUG_MSG("makeFormat done (0x%x)\n", (unsigned int) result);
+
+    return result;
+}
+
+static __GLinterface *glAquaCreateContext(__GLimports *imports,
+                                          __GLcontextModes *mode,
+                                          __GLinterface *shareGC)
+{
+    __GLcontext *result;
+    __GLcontext *sharectx = (__GLcontext *)shareGC;
+    CGLError gl_err;
+
+    GLAQUA_DEBUG_MSG("glAquaCreateContext\n");
+
+    result = (__GLcontext *)calloc(1, sizeof(__GLcontext));
+    if (!result) return NULL;
+
+    result->interface.imports = *imports;
+    result->interface.exports = glAquaExports;
+
+    result->pixelFormat = makeFormat(mode);
+    if (!result->pixelFormat) {
+        free(result);
+        return NULL;
+    }
+
+    result->ctx = NULL;
+    gl_err = CGLCreateContext(result->pixelFormat,
+                              sharectx ? sharectx->ctx : NULL,
+                              &result->ctx);
+
+    if (gl_err != 0) {
+        ErrorF("CGLCreateContext error: %s\n", CGLErrorString(gl_err));
+        CGLDestroyPixelFormat(result->pixelFormat);
+        free(result);
+        return NULL;
+    }
+
+    GLAQUA_DEBUG_MSG("glAquaCreateContext done\n");
+    return (__GLinterface *)result;
+}
+
+Bool
+glAquaRealizeWindow(WindowPtr pWin)
+{
+    // If this window has GL contexts, tell them to reattach
+    Bool result;
+    ScreenPtr pScreen = pWin->drawable.pScreen;
+    glAquaScreenRec *screenPriv = &glAquaScreens[pScreen->myNum];
+    __GLXdrawablePrivate *glxPriv;
+
+    GLAQUA_DEBUG_MSG("glAquaRealizeWindow\n");
+
+    // Allow the window to be created (RootlessRealizeWindow is inside our wrap)
+    pScreen->RealizeWindow = screenPriv->RealizeWindow;
+    result = pScreen->RealizeWindow(pWin);
+    pScreen->RealizeWindow = glAquaRealizeWindow;
+
+    // The Aqua window will already have been created (windows are
+    // realized from top down)
+
+    // Re-attach this window's GL contexts, if any.
+    glxPriv = __glXFindDrawablePrivate(pWin->drawable.id);
+    if (glxPriv) {
+        __GLXcontext *gx;
+        __GLcontext *gc;
+        __GLdrawablePrivate *glPriv = &glxPriv->glPriv;
+        GLAQUA_DEBUG_MSG("glAquaRealizeWindow is GL drawable!\n");
+
+        // GL contexts bound to this window for drawing
+        for (gx = glxPriv->drawGlxc; gx != NULL; gx = gx->next) {
+            gc = (__GLcontext *)gx->gc;
+            attach(gc, glPriv);
+        }
+
+        // GL contexts bound to this window for reading
+        for (gx = glxPriv->readGlxc; gx != NULL; gx = gx->next) {
+            gc = (__GLcontext *)gx->gc;
+            attach(gc, glPriv);
+        }
+    }
+
+    return result;
+}
+
+Bool
+glAquaUnrealizeWindow(WindowPtr pWin)
+{
+    // If this window has GL contexts, tell them to unattach
+    Bool result;
+    ScreenPtr pScreen = pWin->drawable.pScreen;
+    glAquaScreenRec *screenPriv = &glAquaScreens[pScreen->myNum];
+    __GLXdrawablePrivate *glxPriv;
+
+    GLAQUA_DEBUG_MSG("glAquaUnrealizeWindow\n");
+
+    // The Aqua window may have already been destroyed (windows
+    // are unrealized from top down)
+
+    // Unattach this window's GL contexts, if any.
+    glxPriv = __glXFindDrawablePrivate(pWin->drawable.id);
+    if (glxPriv) {
+        __GLXcontext *gx;
+        __GLcontext *gc;
+        GLAQUA_DEBUG_MSG("glAquaUnealizeWindow is GL drawable!\n");
+
+        // GL contexts bound to this window for drawing
+        for (gx = glxPriv->drawGlxc; gx != NULL; gx = gx->next) {
+            gc = (__GLcontext *)gx->gc;
+            unattach(gc);
+        }
+
+        // GL contexts bound to this window for reading
+        for (gx = glxPriv->readGlxc; gx != NULL; gx = gx->next) {
+            gc = (__GLcontext *)gx->gc;
+            unattach(gc);
+        }
+    }
+
+    pScreen->UnrealizeWindow = screenPriv->UnrealizeWindow;
+    result = pScreen->UnrealizeWindow(pWin);
+    pScreen->UnrealizeWindow = glAquaUnrealizeWindow;
+
+    return result;
+}
+
+
+// Originally copied from Mesa
+
+static int                 numConfigs     = 0;
+static __GLXvisualConfig  *visualConfigs  = NULL;
+static void              **visualPrivates = NULL;
+
+/*
+ * In the case the driver defines no GLX visuals we'll use these.
+ * Note that for TrueColor and DirectColor visuals, bufferSize is the 
+ * sum of redSize, greenSize, blueSize and alphaSize, which may be larger 
+ * than the nplanes/rootDepth of the server's X11 visuals
+ */
+#define NUM_FALLBACK_CONFIGS 5
+static __GLXvisualConfig FallbackConfigs[NUM_FALLBACK_CONFIGS] = {
+  /* [0] = RGB, double buffered, Z */
+  {
+    -1,                 /* vid */
+    -1,                 /* class */
+    True,               /* rgba */
+    -1, -1, -1, 0,      /* rgba sizes */
+    -1, -1, -1, 0,      /* rgba masks */
+     0,  0,  0, 0,      /* rgba accum sizes */
+    True,               /* doubleBuffer */
+    False,              /* stereo */
+    -1,                 /* bufferSize */
+    16,                 /* depthSize */
+    0,                  /* stencilSize */
+    0,                  /* auxBuffers */
+    0,                  /* level */
+    GLX_NONE,           /* visualRating */
+    GLX_NONE,           /* transparentPixel */
+    0, 0, 0, 0,         /* transparent rgba color (floats scaled to ints) */
+    0                   /* transparentIndex */
+  },
+  /* [1] = RGB, double buffered, Z, stencil, accum */
+  {
+    -1,                 /* vid */
+    -1,                 /* class */
+    True,               /* rgba */
+    -1, -1, -1, 0,      /* rgba sizes */
+    -1, -1, -1, 0,      /* rgba masks */
+    16, 16, 16, 0,      /* rgba accum sizes */
+    True,               /* doubleBuffer */
+    False,              /* stereo */
+    -1,                 /* bufferSize */
+    16,                 /* depthSize */
+    8,                  /* stencilSize */
+    0,                  /* auxBuffers */
+    0,                  /* level */
+    GLX_NONE,           /* visualRating */
+    GLX_NONE,           /* transparentPixel */
+    0, 0, 0, 0,         /* transparent rgba color (floats scaled to ints) */
+    0                   /* transparentIndex */
+  },
+  /* [2] = RGB+Alpha, double buffered, Z, stencil, accum */
+  {
+    -1,                 /* vid */
+    -1,                 /* class */
+    True,               /* rgba */
+    -1, -1, -1, 8,      /* rgba sizes */
+    -1, -1, -1, -1,     /* rgba masks */
+    16, 16, 16, 16,     /* rgba accum sizes */
+    True,               /* doubleBuffer */
+    False,              /* stereo */
+    -1,                 /* bufferSize */
+    16,                 /* depthSize */
+    8,                  /* stencilSize */
+    0,                  /* auxBuffers */
+    0,                  /* level */
+    GLX_NONE,           /* visualRating */
+    GLX_NONE,           /* transparentPixel */
+    0, 0, 0, 0,         /* transparent rgba color (floats scaled to ints) */
+    0                   /* transparentIndex */
+  },
+  /* [3] = RGB+Alpha, single buffered, Z, stencil, accum */
+  {
+    -1,                 /* vid */
+    -1,                 /* class */
+    True,               /* rgba */
+    -1, -1, -1, 8,      /* rgba sizes */
+    -1, -1, -1, -1,     /* rgba masks */
+    16, 16, 16, 16,     /* rgba accum sizes */
+    False,              /* doubleBuffer */
+    False,              /* stereo */
+    -1,                 /* bufferSize */
+    16,                 /* depthSize */
+    8,                  /* stencilSize */
+    0,                  /* auxBuffers */
+    0,                  /* level */
+    GLX_NONE,           /* visualRating */
+    GLX_NONE,           /* transparentPixel */
+    0, 0, 0, 0,         /* transparent rgba color (floats scaled to ints) */
+    0                   /* transparentIndex */
+  },
+  /* [4] = CI, double buffered, Z */
+  {
+    -1,                 /* vid */
+    -1,                 /* class */
+    False,              /* rgba? (false = color index) */
+    -1, -1, -1, 0,      /* rgba sizes */
+    -1, -1, -1, 0,      /* rgba masks */
+     0,  0,  0, 0,      /* rgba accum sizes */
+    True,               /* doubleBuffer */
+    False,              /* stereo */
+    -1,                 /* bufferSize */
+    16,                 /* depthSize */
+    0,                  /* stencilSize */
+    0,                  /* auxBuffers */
+    0,                  /* level */
+    GLX_NONE,           /* visualRating */
+    GLX_NONE,           /* transparentPixel */
+    0, 0, 0, 0,         /* transparent rgba color (floats scaled to ints) */
+    0                   /* transparentIndex */
+  },
+};
+
+static __GLXvisualConfig NullConfig = {
+    -1,                 /* vid */
+    -1,                 /* class */
+    False,              /* rgba */
+    -1, -1, -1, 0,      /* rgba sizes */
+    -1, -1, -1, 0,      /* rgba masks */
+     0,  0,  0, 0,      /* rgba accum sizes */
+    False,              /* doubleBuffer */
+    False,              /* stereo */
+    -1,                 /* bufferSize */
+    16,                 /* depthSize */
+    0,                  /* stencilSize */
+    0,                  /* auxBuffers */
+    0,                  /* level */
+    GLX_NONE_EXT,       /* visualRating */
+    0,                  /* transparentPixel */
+    0, 0, 0, 0,         /* transparent rgba color (floats scaled to ints) */
+    0                   /* transparentIndex */
+};
+
+
+static inline int count_bits(uint32_t x)
+{
+    x = x - ((x >> 1) & 0x55555555);
+    x = (x & 0x33333333) + ((x >> 2) & 0x33333333);
+    x = (x + (x >> 4)) & 0x0f0f0f0f;
+    x = x + (x >> 8);
+    x = x + (x >> 16);
+    return x & 63;
+}
+
+
+static Bool init_visuals(int *nvisualp, VisualPtr *visualp,
+                         VisualID *defaultVisp,
+                         int ndepth, DepthPtr pdepth,
+                         int rootDepth)
+{
+    int numRGBconfigs;
+    int numCIconfigs;
+    int numVisuals = *nvisualp;
+    int numNewVisuals;
+    int numNewConfigs;
+    VisualPtr pVisual = *visualp;
+    VisualPtr pVisualNew = NULL;
+    VisualID *orig_vid = NULL;
+    __GLcontextModes *modes;
+    __GLXvisualConfig *pNewVisualConfigs = NULL;
+    void **glXVisualPriv;
+    void **pNewVisualPriv;
+    int found_default;
+    int i, j, k;
+
+    GLAQUA_DEBUG_MSG("init_visuals\n");
+
+    if (numConfigs > 0)
+        numNewConfigs = numConfigs;
+    else
+        numNewConfigs = NUM_FALLBACK_CONFIGS;
+
+    /* Alloc space for the list of new GLX visuals */
+    pNewVisualConfigs = (__GLXvisualConfig *)
+                     __glXMalloc(numNewConfigs * sizeof(__GLXvisualConfig));
+    if (!pNewVisualConfigs) {
+        return FALSE;
+    }
+
+    /* Alloc space for the list of new GLX visual privates */
+    pNewVisualPriv = (void **) __glXMalloc(numNewConfigs * sizeof(void *));
+    if (!pNewVisualPriv) {
+        __glXFree(pNewVisualConfigs);
+        return FALSE;
+    }
+
+    /*
+    ** If SetVisualConfigs was not called, then use default GLX
+    ** visual configs.
+    */
+    if (numConfigs == 0) {
+        memcpy(pNewVisualConfigs, FallbackConfigs,
+               NUM_FALLBACK_CONFIGS * sizeof(__GLXvisualConfig));
+        memset(pNewVisualPriv, 0, NUM_FALLBACK_CONFIGS * sizeof(void *));
+    }
+    else {
+        /* copy driver's visual config info */
+        for (i = 0; i < numConfigs; i++) {
+            pNewVisualConfigs[i] = visualConfigs[i];
+            pNewVisualPriv[i] = visualPrivates[i];
+        }
+    }
+
+    /* Count the number of RGB and CI visual configs */
+    numRGBconfigs = 0;
+    numCIconfigs = 0;
+    for (i = 0; i < numNewConfigs; i++) {
+        if (pNewVisualConfigs[i].rgba)
+            numRGBconfigs++;
+        else
+            numCIconfigs++;
+    }
+
+    /* Count the total number of visuals to compute */
+    numNewVisuals = 0;
+    for (i = 0; i < numVisuals; i++) {
+        int count;
+
+        count = ((pVisual[i].class == TrueColor ||
+                  pVisual[i].class == DirectColor)
+                ? numRGBconfigs : numCIconfigs);
+        if (count == 0)
+            count = 1;          /* preserve the existing visual */
+
+        numNewVisuals += count;
+    }
+
+    /* Reset variables for use with the next screen/driver's visual configs */
+    visualConfigs = NULL;
+    numConfigs = 0;
+
+    /* Alloc temp space for the list of orig VisualIDs for each new visual */
+    orig_vid = (VisualID *)__glXMalloc(numNewVisuals * sizeof(VisualID));
+    if (!orig_vid) {
+        __glXFree(pNewVisualPriv);
+        __glXFree(pNewVisualConfigs);
+        return FALSE;
+    }
+
+    /* Alloc space for the list of glXVisuals */
+    modes = _gl_context_modes_create(numNewVisuals, sizeof(__GLcontextModes));
+    if (modes == NULL) {
+        __glXFree(orig_vid);
+        __glXFree(pNewVisualPriv);
+        __glXFree(pNewVisualConfigs);
+        return FALSE;
+    }
+
+    /* Alloc space for the list of glXVisualPrivates */
+    glXVisualPriv = (void **)__glXMalloc(numNewVisuals * sizeof(void *));
+    if (!glXVisualPriv) {
+        _gl_context_modes_destroy( modes );
+        __glXFree(orig_vid);
+        __glXFree(pNewVisualPriv);
+        __glXFree(pNewVisualConfigs);
+        return FALSE;
+    }
+
+    /* Alloc space for the new list of the X server's visuals */
+    pVisualNew = (VisualPtr)__glXMalloc(numNewVisuals * sizeof(VisualRec));
+    if (!pVisualNew) {
+        __glXFree(glXVisualPriv);
+        _gl_context_modes_destroy( modes );
+        __glXFree(orig_vid);
+        __glXFree(pNewVisualPriv);
+        __glXFree(pNewVisualConfigs);
+        return FALSE;
+    }
+
+    /* Initialize the new visuals */
+    found_default = FALSE;
+    glAquaScreens[screenInfo.numScreens-1].modes = modes;
+    for (i = j = 0; i < numVisuals; i++) {
+        int is_rgb = (pVisual[i].class == TrueColor ||
+                      pVisual[i].class == DirectColor);
+
+        if (!is_rgb)
+        {
+            /* We don't support non-rgb visuals for GL. But we don't
+               want to remove them either, so just pass them through
+               with null glX configs */
+
+            pVisualNew[j] = pVisual[i];
+            pVisualNew[j].vid = FakeClientID(0);
+
+            /* Check for the default visual */
+            if (!found_default && pVisual[i].vid == *defaultVisp) {
+                *defaultVisp = pVisualNew[j].vid;
+                found_default = TRUE;
+            }
+
+            /* Save the old VisualID */
+            orig_vid[j] = pVisual[i].vid;
+
+            /* Initialize the glXVisual */
+            _gl_copy_visual_to_context_mode( modes, & NullConfig );
+            modes->visualID = pVisualNew[j].vid;
+
+            j++;
+
+            continue;
+        }
+
+        for (k = 0; k < numNewConfigs; k++) {
+            if (pNewVisualConfigs[k].rgba != is_rgb)
+                continue;
+
+            assert( modes != NULL );
+
+            /* Initialize the new visual */
+            pVisualNew[j] = pVisual[i];
+            pVisualNew[j].vid = FakeClientID(0);
+
+            /* Check for the default visual */
+            if (!found_default && pVisual[i].vid == *defaultVisp) {
+                *defaultVisp = pVisualNew[j].vid;
+                found_default = TRUE;
+            }
+
+            /* Save the old VisualID */
+            orig_vid[j] = pVisual[i].vid;
+
+            /* Initialize the glXVisual */
+            _gl_copy_visual_to_context_mode( modes, & pNewVisualConfigs[k] );
+            modes->visualID = pVisualNew[j].vid;
+
+            /*
+             * If the class is -1, then assume the X visual information
+             * is identical to what GLX needs, and take them from the X
+             * visual.  NOTE: if class != -1, then all other fields MUST
+             * be initialized.
+             */
+            if (modes->visualType == GLX_NONE) {
+                modes->visualType = _gl_convert_from_x_visual_type( pVisual[i].class );
+                modes->redBits    = count_bits(pVisual[i].redMask);
+                modes->greenBits  = count_bits(pVisual[i].greenMask);
+                modes->blueBits   = count_bits(pVisual[i].blueMask);
+                modes->alphaBits  = modes->alphaBits;
+                modes->redMask    = pVisual[i].redMask;
+                modes->greenMask  = pVisual[i].greenMask;
+                modes->blueMask   = pVisual[i].blueMask;
+                modes->alphaMask  = modes->alphaMask;
+                modes->rgbBits = (is_rgb)
+                    ? (modes->redBits + modes->greenBits +
+                       modes->blueBits + modes->alphaBits)
+                    : rootDepth;
+            }
+
+            /* Save the device-dependent private for this visual */
+            glXVisualPriv[j] = pNewVisualPriv[k];
+
+            j++;
+            modes = modes->next;
+        }
+    }
+
+    assert(j <= numNewVisuals);
+
+    /* Save the GLX visuals in the screen structure */
+    glAquaScreens[screenInfo.numScreens-1].num_vis = numNewVisuals;
+    glAquaScreens[screenInfo.numScreens-1].priv = glXVisualPriv;
+
+    /* Set up depth's VisualIDs */
+    for (i = 0; i < ndepth; i++) {
+        int numVids = 0;
+        VisualID *pVids = NULL;
+        int k, n = 0;
+
+        /* Count the new number of VisualIDs at this depth */
+        for (j = 0; j < pdepth[i].numVids; j++)
+            for (k = 0; k < numNewVisuals; k++)
+            if (pdepth[i].vids[j] == orig_vid[k])
+                numVids++;
+
+        /* Allocate a new list of VisualIDs for this depth */
+        pVids = (VisualID *)__glXMalloc(numVids * sizeof(VisualID));
+
+        /* Initialize the new list of VisualIDs for this depth */
+        for (j = 0; j < pdepth[i].numVids; j++)
+            for (k = 0; k < numNewVisuals; k++)
+            if (pdepth[i].vids[j] == orig_vid[k])
+                pVids[n++] = pVisualNew[k].vid;
+
+        /* Update this depth's list of VisualIDs */
+        __glXFree(pdepth[i].vids);
+        pdepth[i].vids = pVids;
+        pdepth[i].numVids = numVids;
+    }
+
+    /* Update the X server's visuals */
+    *nvisualp = numNewVisuals;
+    *visualp = pVisualNew;
+
+    /* Free the old list of the X server's visuals */
+    __glXFree(pVisual);
+
+    /* Clean up temporary allocations */
+    __glXFree(orig_vid);
+    __glXFree(pNewVisualPriv);
+    __glXFree(pNewVisualConfigs);
+
+    /* Free the private list created by DDX HW driver */
+    if (visualPrivates)
+        xfree(visualPrivates);
+    visualPrivates = NULL;
+
+    return TRUE;
+}
+
+/* based on code in i830_dri.c
+   This ends calling glAquaSetVisualConfigs to set the static
+   numconfigs, etc. */
+static void
+glAquaInitVisualConfigs(void)
+{
+    int                 lclNumConfigs     = 0;
+    __GLXvisualConfig  *lclVisualConfigs  = NULL;
+    void              **lclVisualPrivates = NULL;
+
+    int depth, aux, buffers, stencil, accum;
+    int i = 0;
+
+    GLAQUA_DEBUG_MSG("glAquaInitVisualConfigs ");
+        
+    /* count num configs:
+        2 Z buffer (0, 24 bit)
+        2 AUX buffer (0, 2)
+        2 buffers (single, double)
+        2 stencil (0, 8 bit)
+        2 accum (0, 64 bit)
+        = 32 configs */
+
+    lclNumConfigs = 2 * 2 * 2 * 2 * 2; /* 32 */
+
+    /* alloc */
+    lclVisualConfigs = xcalloc(sizeof(__GLXvisualConfig), lclNumConfigs);
+    lclVisualPrivates = xcalloc(sizeof(void *), lclNumConfigs);
+
+    /* fill in configs */
+    if (NULL != lclVisualConfigs) {
+        i = 0; /* current buffer */
+        for (depth = 0; depth < 2; depth++) {
+            for (aux = 0; aux < 2; aux++) {
+                for (buffers = 0; buffers < 2; buffers++) {
+                    for (stencil = 0; stencil < 2; stencil++) {
+                        for (accum = 0; accum < 2; accum++) {
+                            lclVisualConfigs[i].vid = -1;
+                            lclVisualConfigs[i].class = -1;
+                            lclVisualConfigs[i].rgba = TRUE;
+                            lclVisualConfigs[i].redSize = -1;
+                            lclVisualConfigs[i].greenSize = -1;
+                            lclVisualConfigs[i].blueSize = -1;
+                            lclVisualConfigs[i].redMask = -1;
+                            lclVisualConfigs[i].greenMask = -1;
+                            lclVisualConfigs[i].blueMask = -1;
+                            lclVisualConfigs[i].alphaMask = 0;
+                            if (accum) {
+                                lclVisualConfigs[i].accumRedSize = 16;
+                                lclVisualConfigs[i].accumGreenSize = 16;
+                                lclVisualConfigs[i].accumBlueSize = 16;
+                                lclVisualConfigs[i].accumAlphaSize = 16;
+                            }
+                            else {
+                                lclVisualConfigs[i].accumRedSize = 0;
+                                lclVisualConfigs[i].accumGreenSize = 0;
+                                lclVisualConfigs[i].accumBlueSize = 0;
+                                lclVisualConfigs[i].accumAlphaSize = 0;
+                            }
+                            lclVisualConfigs[i].doubleBuffer = buffers ? TRUE : FALSE;
+                            lclVisualConfigs[i].stereo = FALSE;
+                            lclVisualConfigs[i].bufferSize = -1;
+
+                            lclVisualConfigs[i].depthSize = depth? 24 : 0;
+                            lclVisualConfigs[i].stencilSize = stencil ? 8 : 0;
+                            lclVisualConfigs[i].auxBuffers = aux ? 2 : 0;
+                            lclVisualConfigs[i].level = 0;
+                            lclVisualConfigs[i].visualRating = GLX_NONE_EXT;
+                            lclVisualConfigs[i].transparentPixel = 0;
+                            lclVisualConfigs[i].transparentRed = 0;
+                            lclVisualConfigs[i].transparentGreen = 0;
+                            lclVisualConfigs[i].transparentBlue = 0;
+                            lclVisualConfigs[i].transparentAlpha = 0;
+                            lclVisualConfigs[i].transparentIndex = 0;
+                            i++;
+                        }
+                    }
+                }
+            }
+        }
+    }
+    if (i != lclNumConfigs)
+        GLAQUA_DEBUG_MSG("glAquaInitVisualConfigs failed to alloc visual configs");
+
+    GlxSetVisualConfigs(lclNumConfigs, lclVisualConfigs, lclVisualPrivates);
+}
+
+
+static void glAquaSetVisualConfigs(int nconfigs, __GLXvisualConfig *configs,
+                                   void **privates)
+{
+    GLAQUA_DEBUG_MSG("glAquaSetVisualConfigs\n");
+
+    numConfigs = nconfigs;
+    visualConfigs = configs;
+    visualPrivates = privates;
+}
+
+static Bool glAquaInitVisuals(VisualPtr *visualp, DepthPtr *depthp,
+                              int *nvisualp, int *ndepthp,
+                              int *rootDepthp, VisualID *defaultVisp,
+                              unsigned long sizes, int bitsPerRGB)
+{
+    GLAQUA_DEBUG_MSG("glAquaInitVisuals\n");
+    
+    if (numConfigs == 0) /* if no configs */
+        glAquaInitVisualConfigs(); /* ensure the visual configs are setup */
+
+    /*
+     * Setup the visuals supported by this particular screen.
+     */
+    return init_visuals(nvisualp, visualp, defaultVisp,
+                        *ndepthp, *depthp, *rootDepthp);
+}
+
+
+static void fixup_visuals(int screen)
+{
+    ScreenPtr pScreen = screenInfo.screens[screen];
+    glAquaScreenRec *pScr = &glAquaScreens[screen];
+    int j;
+    __GLcontextModes *modes;
+
+    GLAQUA_DEBUG_MSG("fixup_visuals\n");
+
+    for ( modes = pScr->modes ; modes != NULL ; modes = modes->next ) {
+        const int vis_class = _gl_convert_to_x_visual_type( modes->visualType );
+        const int nplanes = (modes->rgbBits - modes->alphaBits);
+        const VisualPtr pVis = pScreen->visuals;
+
+        /* Find a visual that matches the GLX visual's class and size */
+        for (j = 0; j < pScreen->numVisuals; j++) {
+            if (pVis[j].class == vis_class &&
+            pVis[j].nplanes == nplanes) {
+
+            /* Fixup the masks */
+            modes->redMask   = pVis[j].redMask;
+            modes->greenMask = pVis[j].greenMask;
+            modes->blueMask  = pVis[j].blueMask;
+
+            /* Recalc the sizes */
+            modes->redBits   = count_bits(modes->redMask);
+            modes->greenBits = count_bits(modes->greenMask);
+            modes->blueBits  = count_bits(modes->blueMask);
+            }
+        }
+    }
+}
+
+static void init_screen_visuals(int screen)
+{
+    ScreenPtr pScreen = screenInfo.screens[screen];
+    __GLcontextModes *modes;
+    int *used;
+    int i, j;
+
+    GLAQUA_DEBUG_MSG("init_screen_visuals\n");
+
+    /* FIXME: Change 'used' to be a array of bits (rather than of ints),
+     * FIXME: create a stack array of 8 or 16 bytes.  If 'numVisuals' is less
+     * FIXME: than 64 or 128 the stack array can be used instead of calling
+     * FIXME: __glXMalloc / __glXFree.  If nothing else, convert 'used' to
+     * FIXME: array of bytes instead of ints!
+     */
+    used = (int *)__glXMalloc(pScreen->numVisuals * sizeof(int));
+    __glXMemset(used, 0, pScreen->numVisuals * sizeof(int));
+
+    i = 0;
+    for ( modes = glAquaScreens[screen].modes 
+          ; modes != NULL
+          ; modes = modes->next ) {
+        const int vis_class = _gl_convert_to_x_visual_type( modes->visualType );
+        const int nplanes = (modes->rgbBits - modes->alphaBits);
+        const VisualPtr pVis = pScreen->visuals;
+
+        for (j = 0; j < pScreen->numVisuals; j++) {
+            if (pVis[j].class     == vis_class &&
+                pVis[j].nplanes   == nplanes &&
+                pVis[j].redMask   == modes->redMask &&
+                pVis[j].greenMask == modes->greenMask &&
+                pVis[j].blueMask  == modes->blueMask &&
+                !used[j]) {
+
+                    /* Set the VisualID */
+                    modes->visualID = pVis[j].vid;
+
+                    /* Mark this visual used */
+                    used[j] = 1;
+                    break;
+            }
+        }
+        if ( j == pScreen->numVisuals ) {
+            ErrorF("No matching visual for __GLcontextMode with "
+                   "visual class = %d (%d), nplanes = %u\n",
+                   vis_class, 
+                   (int)modes->visualType,
+                   (unsigned int)(modes->rgbBits - modes->alphaBits) );
+        }
+        else if ( modes->visualID == -1 ) {
+            FatalError( "Matching visual found, but visualID still -1!\n" );
+        }
+
+        i++;
+    }
+
+    __glXFree(used);
+}
+
+static Bool glAquaScreenProbe(int screen)
+{
+    ScreenPtr pScreen;
+    glAquaScreenRec *screenPriv;
+
+    GLAQUA_DEBUG_MSG("glAquaScreenProbe\n");
+
+    /*
+     * Set up the current screen's visuals.
+     */
+    __glDDXScreenInfo.modes = glAquaScreens[screen].modes;
+    __glDDXScreenInfo.pVisualPriv = glAquaScreens[screen].priv;
+    __glDDXScreenInfo.numVisuals =
+        __glDDXScreenInfo.numUsableVisuals = glAquaScreens[screen].num_vis;
+
+    /*
+     * Set the current screen's createContext routine.  This could be
+     * wrapped by a DDX GLX context creation routine.
+     */
+    __glDDXScreenInfo.createContext = glAquaCreateContext;
+
+    /*
+     * The ordering of the rgb compenents might have been changed by the
+     * driver after mi initialized them.
+     */
+    fixup_visuals(screen);
+
+    /*
+     * Find the GLX visuals that are supported by this screen and create
+     * XMesa's visuals.
+     */
+    init_screen_visuals(screen);
+
+    /*
+     * Wrap RealizeWindow and UnrealizeWindow on this screen
+     */
+    pScreen = screenInfo.screens[screen];
+    screenPriv = &glAquaScreens[screen];
+    screenPriv->RealizeWindow = pScreen->RealizeWindow;
+    pScreen->RealizeWindow = glAquaRealizeWindow;
+    screenPriv->UnrealizeWindow = pScreen->UnrealizeWindow;
+    pScreen->UnrealizeWindow = glAquaUnrealizeWindow;
+
+    return TRUE;
+}
+
+static GLboolean glAquaSwapBuffers(__GLXdrawablePrivate *glxPriv)
+{
+    // swap buffers on only *one* of the contexts
+    // (e.g. the last one for drawing)
+    __GLcontext *gc = (__GLcontext *)glxPriv->drawGlxc->gc;
+    CGLError gl_err;
+
+    GLAQUA_DEBUG_MSG("glAquaSwapBuffers\n");
+
+    if (gc != NULL && gc->ctx != NULL)
+    {
+        gl_err = CGLFlushDrawable(gc->ctx);
+        if (gl_err != 0)
+            ErrorF("CGLFlushDrawable error: %s\n", CGLErrorString(gl_err));
+    }
+
+    return GL_TRUE;
+}
+
+static void glAquaDestroyDrawablePrivate(__GLdrawablePrivate *glPriv)
+{
+    GLAQUA_DEBUG_MSG("glAquaDestroyDrawablePrivate\n");
+
+    /* It doesn't work to call DRIDestroySurface here, the drawable's
+       already gone.. But dri.c notices the window destruction and
+       frees the surface itself. */
+
+    free(glPriv->private);
+    glPriv->private = NULL;
+}
+
+static void glAquaCreateBuffer(__GLXdrawablePrivate *glxPriv)
+{
+    GLAquaDrawableRec *aquaPriv = malloc(sizeof(GLAquaDrawableRec));
+    __GLdrawablePrivate *glPriv = &glxPriv->glPriv;
+
+    aquaPriv->sid = 0;
+    aquaPriv->pDraw = NULL;
+
+    GLAQUA_DEBUG_MSG("glAquaCreateBuffer\n");
+
+    // replace swapBuffers (original is never called)
+    glxPriv->swapBuffers = glAquaSwapBuffers;
+
+    // stash private data
+    glPriv->private = aquaPriv;
+    glPriv->freePrivate = glAquaDestroyDrawablePrivate;
+}
+
+static void glAquaResetExtension(void)
+{
+    GLAQUA_DEBUG_MSG("glAquaResetExtension\n");
+    CGLSetOption(kCGLGOResetLibrary, GL_TRUE);
+}
+
+// Extra goodies for glx
+
+GLuint __glFloorLog2(GLuint val)
+{
+    int c = 0;
+
+    while (val > 1) {
+        c++;
+        val >>= 1;
+    }
+    return c;
+}