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, 914 insertions, 0 deletions

diff --git a/nx-X11/programs/Xserver/GL/mesa/X/xf86glx.c b/nx-X11/programs/Xserver/GL/mesa/X/xf86glx.c
new file mode 100644
index 000000000..5dd4e7c37
--- /dev/null
+++ b/nx-X11/programs/Xserver/GL/mesa/X/xf86glx.c
@@ -0,0 +1,914 @@
+/* $XFree86: xc/programs/Xserver/GL/mesa/src/X/xf86glx.c,v 1.19 2003/07/16 01:38:27 dawes Exp $ */
+/**************************************************************************
+
+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, sub license, 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 (including the
+next paragraph) 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 NON-INFRINGEMENT.
+IN NO EVENT SHALL PRECISION INSIGHT AND/OR ITS SUPPLIERS 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.
+
+**************************************************************************/
+
+/*
+ * Authors:
+ *   Kevin E. Martin <kevin@precisioninsight.com>
+ *   Brian E. Paul <brian@precisioninsight.com>
+ *
+ */
+
+#ifdef HAVE_DIX_CONFIG_H
+#include <dix-config.h>
+#endif
+
+#include <regionstr.h>
+#include <resource.h>
+#include <GL/gl.h>
+#include <GL/glxint.h>
+#include <GL/glxtokens.h>
+#include <scrnintstr.h>
+#include <config.h>
+#include <glxserver.h>
+#include <glxscreens.h>
+#include <glxdrawable.h>
+#include <glxcontext.h>
+#include <glxext.h>
+#include <glxutil.h>
+#include "xf86glxint.h"
+#include "context.h"
+#include "xmesaP.h"
+#include <GL/xf86glx.h>
+#include "context.h"
+
+/*
+ * This define is for the glcore.h header file.
+ * If you add it here, then make sure you also add it in
+ * ../../../glx/Imakefile.
+ */
+#if 0
+#define DEBUG
+#include <GL/internal/glcore.h>
+#undef DEBUG
+#else
+#include <GL/internal/glcore.h>
+#endif
+
+#include "glcontextmodes.h"
+
+/*
+ * 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, pGlxVisual, numVisuals,
+ * and numUsableVisuals fields must be initialized.
+ */
+static __GLXscreenInfo __glDDXScreenInfo = {
+    __MESA_screenProbe,   /* Must be generic and handle all screens */
+    __MESA_createContext, /* Substitute screen's createContext routine */
+    __MESA_createBuffer,  /* 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 */
+    NULL,                 /* GLextensions is overwritten by __glXScreenInit */
+    "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_MESA,
+    __MESA_resetExtension,
+    __MESA_initVisuals,
+    __MESA_setVisualConfigs
+};
+
+void *__glXglDDXExtensionInfo(void) {
+    return &__glDDXExtensionInfo;
+}
+
+static __MESA_screen  MESAScreens[MAXSCREENS];
+static __GLcontext   *MESA_CC        = NULL;
+
+static int                 numConfigs     = 0;
+static __GLXvisualConfig  *visualConfigs  = NULL;
+static void              **visualPrivates = NULL;
+
+
+static int count_bits(unsigned int n)
+{
+   int bits = 0;
+
+   while (n > 0) {
+      if (n & 1) bits++;
+      n >>= 1;
+   }
+   return bits;
+}
+
+
+static XMesaVisual find_mesa_visual(int screen, VisualID vid)
+{
+    __MESA_screen * const pMScr = &MESAScreens[screen];
+    const __GLcontextModes *modes;
+    unsigned i = 0;
+
+    for ( modes = pMScr->modes ; modes != NULL ; modes = modes->next ) {
+	if ( modes->visualID == vid ) {
+	    break;
+	}
+
+	i++;
+    }
+
+    return (modes != NULL) ? pMScr->xm_vis[i] : 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 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;
+
+    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++) {
+        numNewVisuals +=
+	    (pVisual[i].class == TrueColor || pVisual[i].class == DirectColor)
+	    ? numRGBconfigs : numCIconfigs;
+    }
+
+    /* 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;
+    MESAScreens[screenInfo.numScreens-1].modes = modes;
+    for (i = j = 0; i < numVisuals; i++) {
+        int is_rgb = (pVisual[i].class == TrueColor ||
+		      pVisual[i].class == DirectColor);
+
+	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 */
+    MESAScreens[screenInfo.numScreens-1].num_vis = numNewVisuals;
+    MESAScreens[screenInfo.numScreens-1].private = 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;
+}
+
+void __MESA_setVisualConfigs(int nconfigs, __GLXvisualConfig *configs,
+			     void **privates)
+{
+    numConfigs = nconfigs;
+    visualConfigs = configs;
+    visualPrivates = privates;
+}
+
+Bool __MESA_initVisuals(VisualPtr *visualp, DepthPtr *depthp,
+			int *nvisualp, int *ndepthp, int *rootDepthp,
+			VisualID *defaultVisp, unsigned long sizes,
+			int bitsPerRGB)
+{
+    /*
+     * 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];
+    __MESA_screen *pMScr = &MESAScreens[screen];
+    int j;
+    __GLcontextModes *modes;
+
+    for ( modes = pMScr->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;
+    XMesaVisual *pXMesaVisual;
+    int *used;
+    int i, j;
+
+    /* Alloc space for the list of XMesa visuals */
+    pXMesaVisual = (XMesaVisual *)__glXMalloc(MESAScreens[screen].num_vis *
+					      sizeof(XMesaVisual));
+    __glXMemset(pXMesaVisual, 0,
+		MESAScreens[screen].num_vis * sizeof(XMesaVisual));
+
+    /* 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 = MESAScreens[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]) {
+
+		/* Create the XMesa visual */
+		pXMesaVisual[i] =
+		    XMesaCreateVisual(pScreen,
+				      pVis,
+				      modes->rgbMode,
+				      (modes->alphaBits > 0),
+				      modes->doubleBufferMode,
+				      modes->stereoMode,
+				      GL_TRUE, /* ximage_flag */
+				      modes->depthBits,
+				      modes->stencilBits,
+				      modes->accumRedBits,
+				      modes->accumGreenBits,
+				      modes->accumBlueBits,
+				      modes->accumAlphaBits,
+				      modes->samples,
+				      modes->level,
+				      modes->visualRating);
+		/* 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, 
+		   modes->visualType,
+		   (modes->rgbBits - modes->alphaBits) );
+	}
+	else if ( modes->visualID == -1 ) {
+	    FatalError( "Matching visual found, but visualID still -1!\n" );
+	}
+
+	i++;
+    }
+
+    __glXFree(used);
+
+    MESAScreens[screen].xm_vis = pXMesaVisual;
+}
+
+Bool __MESA_screenProbe(int screen)
+{
+    /*
+     * Set up the current screen's visuals.
+     */
+    __glDDXScreenInfo.modes = MESAScreens[screen].modes;
+    __glDDXScreenInfo.pVisualPriv = MESAScreens[screen].private;
+    __glDDXScreenInfo.numVisuals =
+	__glDDXScreenInfo.numUsableVisuals = MESAScreens[screen].num_vis;
+
+    /*
+     * Set the current screen's createContext routine.  This could be
+     * wrapped by a DDX GLX context creation routine.
+     */
+    __glDDXScreenInfo.createContext = __MESA_createContext;
+
+    /*
+     * 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);
+
+    return TRUE;
+}
+
+extern void __MESA_resetExtension(void)
+{
+    int i, j;
+
+    XMesaReset();
+
+    for (i = 0; i < screenInfo.numScreens; i++) {
+	for (j = 0; j < MESAScreens[i].num_vis; j++) {
+	  if (MESAScreens[i].xm_vis[j]) {
+	        XMesaDestroyVisual(MESAScreens[i].xm_vis[j]);
+		MESAScreens[i].xm_vis[j] = NULL;
+	  }
+	}
+	_gl_context_modes_destroy( MESAScreens[i].modes );
+	MESAScreens[i].modes = NULL;
+	__glXFree(MESAScreens[i].private);
+	MESAScreens[i].private = NULL;
+	__glXFree(MESAScreens[i].xm_vis);
+	MESAScreens[i].xm_vis = NULL;
+	MESAScreens[i].num_vis = 0;
+    }
+    __glDDXScreenInfo.modes = NULL;
+    MESA_CC = NULL;
+}
+
+void __MESA_createBuffer(__GLXdrawablePrivate *glxPriv)
+{
+    DrawablePtr pDraw = glxPriv->pDraw;
+    XMesaVisual xm_vis = find_mesa_visual(pDraw->pScreen->myNum,
+					  glxPriv->modes->visualID);
+    __GLdrawablePrivate *glPriv = &glxPriv->glPriv;
+    __MESA_buffer buf;
+
+    if (xm_vis == NULL) {
+	ErrorF("find_mesa_visual returned NULL for visualID = 0x%04x\n",
+	       glxPriv->modes->visualID);
+    }
+    buf = (__MESA_buffer)__glXMalloc(sizeof(struct __MESA_bufferRec));
+
+    /* Create Mesa's buffers */
+    if (glxPriv->type == DRAWABLE_WINDOW) {
+	buf->xm_buf = (void *)XMesaCreateWindowBuffer(xm_vis,
+						      (WindowPtr)pDraw);
+    } else {
+	buf->xm_buf = (void *)XMesaCreatePixmapBuffer(xm_vis,
+						      (PixmapPtr)pDraw, 0);
+    }
+
+    /* Wrap the front buffer's resize routine */
+    buf->fbresize = glPriv->frontBuffer.resize;
+    glPriv->frontBuffer.resize = __MESA_resizeBuffers;
+
+    /* Wrap the swap buffers routine */
+    buf->fbswap = glxPriv->swapBuffers;
+    glxPriv->swapBuffers = __MESA_swapBuffers;
+
+    /* Save Mesa's private buffer structure */
+    glPriv->private = (void *)buf;
+    glPriv->freePrivate = __MESA_destroyBuffer;
+}
+
+GLboolean __MESA_resizeBuffers(__GLdrawableBuffer *buffer,
+			       GLint x, GLint y,
+			       GLuint width, GLuint height, 
+			       __GLdrawablePrivate *glPriv,
+			       GLuint bufferMask)
+{
+    __MESA_buffer buf = (__MESA_buffer)glPriv->private;
+
+    if (buf->xm_buf)
+	XMesaResizeBuffers(buf->xm_buf);
+
+    return (*buf->fbresize)(buffer, x, y, width, height, glPriv, bufferMask);
+}
+
+GLboolean __MESA_swapBuffers(__GLXdrawablePrivate *glxPriv)
+{
+    __MESA_buffer buf = (__MESA_buffer)glxPriv->glPriv.private;
+
+    /*
+    ** Do not call the wrapped swap buffers routine since Mesa has
+    ** already done the swap.
+    */
+    XMesaSwapBuffers(buf->xm_buf);
+
+    return GL_TRUE;
+}
+
+void __MESA_destroyBuffer(__GLdrawablePrivate *glPriv)
+{
+    __MESA_buffer buf = (__MESA_buffer)glPriv->private;
+    __GLXdrawablePrivate *glxPriv = (__GLXdrawablePrivate *)glPriv->other;
+
+    /* Destroy Mesa's buffers */
+    if (buf->xm_buf)
+	XMesaDestroyBuffer(buf->xm_buf);
+
+    /* Unwrap these routines */
+    glxPriv->swapBuffers = buf->fbswap;
+    glPriv->frontBuffer.resize = buf->fbresize;
+
+    __glXFree(glPriv->private);
+    glPriv->private = NULL;
+}
+
+__GLinterface *__MESA_createContext(__GLimports *imports,
+				    __GLcontextModes *modes,
+				    __GLinterface *shareGC)
+{
+    __GLcontext *gl_ctx = NULL;
+    __GLcontext *m_share = NULL;
+    __GLXcontext *glxc = (__GLXcontext *)imports->other;
+    XMesaVisual xm_vis;
+
+    if (shareGC) 
+       m_share = (__GLcontext *)shareGC;
+
+    xm_vis = find_mesa_visual(glxc->pScreen->myNum, glxc->modes->visualID);
+    if (xm_vis) {
+       XMesaContext xmshare = m_share ? m_share->DriverCtx : 0;
+       XMesaContext xmctx = XMesaCreateContext(xm_vis, xmshare);
+       gl_ctx = xmctx ? &xmctx->mesa : 0;
+    }
+    else {
+	ErrorF("find_mesa_visual returned NULL for visualID = 0x%04x\n",
+	       glxc->modes->visualID);
+    }
+
+
+    if (!gl_ctx)
+       return NULL;
+	
+    gl_ctx->imports = *imports;
+    gl_ctx->exports.destroyContext = __MESA_destroyContext;
+    gl_ctx->exports.loseCurrent = __MESA_loseCurrent;
+    gl_ctx->exports.makeCurrent = __MESA_makeCurrent;
+    gl_ctx->exports.shareContext = __MESA_shareContext;
+    gl_ctx->exports.copyContext = __MESA_copyContext;
+    gl_ctx->exports.forceCurrent = __MESA_forceCurrent;
+    gl_ctx->exports.notifyResize = __MESA_notifyResize;
+    gl_ctx->exports.notifyDestroy = __MESA_notifyDestroy;
+    gl_ctx->exports.notifySwapBuffers = __MESA_notifySwapBuffers;
+    gl_ctx->exports.dispatchExec = __MESA_dispatchExec;
+    gl_ctx->exports.beginDispatchOverride = __MESA_beginDispatchOverride;
+    gl_ctx->exports.endDispatchOverride = __MESA_endDispatchOverride;
+
+    return (__GLinterface *)gl_ctx;
+}
+
+GLboolean __MESA_destroyContext(__GLcontext *gc)
+{
+    XMesaContext xmesa = (XMesaContext) gc->DriverCtx;
+    XMesaDestroyContext( xmesa );
+    return GL_TRUE;
+}
+
+GLboolean __MESA_loseCurrent(__GLcontext *gc)
+{
+    XMesaContext xmesa = (XMesaContext) gc->DriverCtx;
+    MESA_CC = NULL;
+    __glXLastContext = NULL;
+    return XMesaLoseCurrent(xmesa);
+}
+
+GLboolean __MESA_makeCurrent(__GLcontext *gc)
+{
+    __GLdrawablePrivate *drawPriv = gc->imports.getDrawablePrivate( gc );
+    __MESA_buffer drawBuf = (__MESA_buffer)drawPriv->private;
+    __GLdrawablePrivate *readPriv = gc->imports.getReadablePrivate( gc );
+    __MESA_buffer readBuf = (__MESA_buffer)readPriv->private;
+    XMesaContext xmesa = (XMesaContext) gc->DriverCtx;
+
+    MESA_CC = gc;
+    return XMesaMakeCurrent2(xmesa, drawBuf->xm_buf, readBuf->xm_buf);
+}
+
+GLboolean __MESA_shareContext(__GLcontext *gc, __GLcontext *gcShare)
+{
+    /* NOT_DONE */
+    /* XXX I don't see where/how this could ever be called */
+    ErrorF("__MESA_shareContext\n");
+    return GL_FALSE;
+}
+
+GLboolean __MESA_copyContext(__GLcontext *dst, const __GLcontext *src,
+			     GLuint mask)
+{
+    XMesaContext xm_dst = (XMesaContext) dst->DriverCtx;
+    const XMesaContext xm_src = (const XMesaContext) src->DriverCtx;
+    _mesa_copy_context(&xm_src->mesa, &xm_dst->mesa, mask);
+    return GL_TRUE;
+}
+
+GLboolean __MESA_forceCurrent(__GLcontext *gc)
+{
+    XMesaContext xmesa = (XMesaContext) gc->DriverCtx;
+    MESA_CC = gc;
+    return XMesaForceCurrent(xmesa);
+}
+
+GLboolean __MESA_notifyResize(__GLcontext *gc)
+{
+    /* NOT_DONE */
+    ErrorF("__MESA_notifyResize\n");
+    return GL_FALSE;
+}
+
+void __MESA_notifyDestroy(__GLcontext *gc)
+{
+    /* NOT_DONE */
+    ErrorF("__MESA_notifyDestroy\n");
+    return;
+}
+
+void __MESA_notifySwapBuffers(__GLcontext *gc)
+{
+    _mesa_notifySwapBuffers(gc);
+}
+
+struct __GLdispatchStateRec *__MESA_dispatchExec(__GLcontext *gc)
+{
+    /* NOT_DONE */
+    ErrorF("__MESA_dispatchExec\n");
+    return NULL;
+}
+
+void __MESA_beginDispatchOverride(__GLcontext *gc)
+{
+    /* NOT_DONE */
+    ErrorF("__MESA_beginDispatchOverride\n");
+    return;
+}
+
+void __MESA_endDispatchOverride(__GLcontext *gc)
+{
+    /* NOT_DONE */
+    ErrorF("__MESA_endDispatchOverride\n");
+    return;
+}
+
+
+/*
+ * Server-side GLX uses these functions which are normally defined
+ * in the OpenGL SI.
+ */
+
+GLuint __glFloorLog2(GLuint val)
+{
+    int c = 0;
+
+    while (val > 1) {
+	c++;
+	val >>= 1;
+    }
+    return c;
+}
+