src/gallium/state_trackers/xorg/xorg_dri2.c - fp2-dev/platform/external/mesa3d - Gitiles

 /*
  * Copyright 2008 Tungsten Graphics, 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 TUNGSTEN GRAPHICS 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.
  *
  *
  * Author: Alan Hourihane <alanh@tungstengraphics.com>
  * Author: Jakob Bornecrantz <wallbraker@gmail.com>
  *
  */

 #include "xorg-server.h"
 #include "xf86.h"
 #include "xf86_OSproc.h"

 #include "xorg_tracker.h"
 #include "xorg_exa.h"

 #include "dri2.h"

 #include "pipe/p_state.h"
 #include "pipe/p_inlines.h"

 #include "util/u_rect.h"

 typedef struct {
     PixmapPtr pPixmap;
     struct pipe_texture *tex;
     struct pipe_fence_handle *fence;
 } *BufferPrivatePtr;

 static Bool
 driDoCreateBuffer(DrawablePtr pDraw, DRI2BufferPtr buffer, unsigned int format)
 {
     struct pipe_texture *tex = NULL;
     ScreenPtr pScreen = pDraw->pScreen;
     ScrnInfoPtr pScrn = xf86Screens[pScreen->myNum];
     modesettingPtr ms = modesettingPTR(pScrn);
     struct exa_pixmap_priv *exa_priv;
     BufferPrivatePtr private = buffer->driverPrivate;
     PixmapPtr pPixmap;
     unsigned stride, handle;

     if (pDraw->type == DRAWABLE_PIXMAP)
 	pPixmap = (PixmapPtr) pDraw;
     else
 	pPixmap = (*pScreen->GetWindowPixmap)((WindowPtr) pDraw);
     exa_priv = exaGetPixmapDriverPrivate(pPixmap);

     switch (buffer->attachment) {
     default:
 	if (buffer->attachment != DRI2BufferFakeFrontLeft ||
 	    pDraw->type != DRAWABLE_PIXMAP) {
 	    private->pPixmap = (*pScreen->CreatePixmap)(pScreen, pDraw->width,
 							pDraw->height,
 							pDraw->depth,
 							0);
 	}
 	break;
     case DRI2BufferFrontLeft:
 	break;
     case DRI2BufferStencil:
 #if defined(DRI2INFOREC_VERSION) && DRI2INFOREC_VERSION > 2
     case DRI2BufferDepthStencil:
 #else
     /* Works on old X servers because sanity checking is for the weak */
     case 9:
 #endif
 	if (exa_priv->depth_stencil_tex &&
 	    !pf_is_depth_stencil(exa_priv->depth_stencil_tex->format))
 	    exa_priv->depth_stencil_tex = NULL;
         /* Fall through */
     case DRI2BufferDepth:
 	if (exa_priv->depth_stencil_tex)
 	    pipe_texture_reference(&tex, exa_priv->depth_stencil_tex);
         else {
 	    struct pipe_texture template;
 	    memset(&template, 0, sizeof(template));
 	    template.target = PIPE_TEXTURE_2D;
 	    if (buffer->attachment == DRI2BufferDepth)
 		template.format = ms->ds_depth_bits_last ?
 		    PIPE_FORMAT_X8Z24_UNORM : PIPE_FORMAT_Z24X8_UNORM;
 	    else
 		template.format = ms->ds_depth_bits_last ?
 		    PIPE_FORMAT_S8Z24_UNORM : PIPE_FORMAT_Z24S8_UNORM;
 	    pf_get_block(template.format, &template.block);
 	    template.width[0] = pDraw->width;
 	    template.height[0] = pDraw->height;
 	    template.depth[0] = 1;
 	    template.last_level = 0;
 	    template.tex_usage = PIPE_TEXTURE_USAGE_DEPTH_STENCIL |
 		PIPE_TEXTURE_USAGE_DISPLAY_TARGET;
 	    tex = ms->screen->texture_create(ms->screen, &template);
 	    pipe_texture_reference(&exa_priv->depth_stencil_tex, tex);
 	}
 	break;
     }

     if (!private->pPixmap) {
 	private->pPixmap = pPixmap;
 	pPixmap->refcnt++;
     }

     if (!tex) {
 	exaMoveInPixmap(private->pPixmap);
 	xorg_exa_set_shared_usage(private->pPixmap);
 	pScreen->ModifyPixmapHeader(private->pPixmap, 0, 0, 0, 0, 0, NULL);
 	tex = xorg_exa_get_texture(private->pPixmap);
     }

     if (!tex)
 	FatalError("NO TEXTURE IN DRI2\n");

     ms->api->shared_handle_from_texture(ms->api, ms->screen, tex, &stride, &handle);

     buffer->name = handle;
     buffer->pitch = stride;
     buffer->cpp = 4;
     buffer->driverPrivate = private;
     buffer->flags = 0; /* not tiled */
     private->tex = tex;

     return TRUE;
 }

 static void
 driDoDestroyBuffer(DrawablePtr pDraw, DRI2BufferPtr buffer)
 {
     ScreenPtr pScreen = pDraw->pScreen;
     ScrnInfoPtr pScrn = xf86Screens[pScreen->myNum];
     modesettingPtr ms = modesettingPTR(pScrn);
     BufferPrivatePtr private = buffer->driverPrivate;
     struct exa_pixmap_priv *exa_priv = exaGetPixmapDriverPrivate(private->pPixmap);

     pipe_texture_reference(&private->tex, NULL);
     ms->screen->fence_reference(ms->screen, &private->fence, NULL);
     pipe_texture_reference(&exa_priv->depth_stencil_tex, NULL);
     (*pScreen->DestroyPixmap)(private->pPixmap);
 }

 #if defined(DRI2INFOREC_VERSION) && DRI2INFOREC_VERSION > 2

 static DRI2BufferPtr
 driCreateBuffer(DrawablePtr pDraw, unsigned int attachment, unsigned int format)
 {
     DRI2BufferPtr buffer;
     BufferPrivatePtr private;

     buffer = xcalloc(1, sizeof *buffer);
     if (!buffer)
 	return NULL;

     private = xcalloc(1, sizeof *private);
     if (!private) {
 	goto fail;
     }

     buffer->attachment = attachment;
     buffer->driverPrivate = private;

     if (driDoCreateBuffer(pDraw, buffer, format))
 	return buffer;

     xfree(private);
 fail:
     xfree(buffer);
     return NULL;
 }

 static void
 driDestroyBuffer(DrawablePtr pDraw, DRI2BufferPtr buffer)
 {
     driDoDestroyBuffer(pDraw, buffer);

     xfree(buffer->driverPrivate);
     xfree(buffer);
 }

 #else /* DRI2INFOREC_VERSION <= 2 */

 static DRI2BufferPtr
 driCreateBuffers(DrawablePtr pDraw, unsigned int *attachments, int count)
 {
     BufferPrivatePtr privates;
     DRI2BufferPtr buffers;
     int i;

     buffers = xcalloc(count, sizeof *buffers);
     if (!buffers)
 	goto fail_buffers;

     privates = xcalloc(count, sizeof *privates);
     if (!privates)
 	goto fail_privates;

     for (i = 0; i < count; i++) {
 	buffers[i].attachment = attachments[i];
 	buffers[i].driverPrivate = &privates[i];

 	if (!driDoCreateBuffer(pDraw, &buffers[i], 0))
 	    goto fail;
     }

     return buffers;

 fail:
     xfree(privates);
 fail_privates:
     xfree(buffers);
 fail_buffers:
     return NULL;
 }

 static void
 driDestroyBuffers(DrawablePtr pDraw, DRI2BufferPtr buffers, int count)
 {
     int i;

     for (i = 0; i < count; i++) {
 	driDoDestroyBuffer(pDraw, &buffers[i]);
     }

     if (buffers) {
 	xfree(buffers[0].driverPrivate);
 	xfree(buffers);
     }
 }

 #endif /* DRI2INFOREC_VERSION */

 static void
 driCopyRegion(DrawablePtr pDraw, RegionPtr pRegion,
               DRI2BufferPtr pDestBuffer, DRI2BufferPtr pSrcBuffer)
 {
     ScreenPtr pScreen = pDraw->pScreen;
     ScrnInfoPtr pScrn = xf86Screens[pScreen->myNum];
     modesettingPtr ms = modesettingPTR(pScrn);
     BufferPrivatePtr dst_priv = pDestBuffer->driverPrivate;
     BufferPrivatePtr src_priv = pSrcBuffer->driverPrivate;
     PixmapPtr src_pixmap;
     PixmapPtr dst_pixmap;
     GCPtr gc;
     RegionPtr copy_clip;

     /*
      * In driCreateBuffers we dewrap windows into the
      * backing pixmaps in order to get to the texture.
      * We need to use the real drawable in CopyArea
      * so that cliprects and offsets are correct.
      */
     src_pixmap = src_priv->pPixmap;
     dst_pixmap = dst_priv->pPixmap;
     if (pSrcBuffer->attachment == DRI2BufferFrontLeft)
 	src_pixmap = (PixmapPtr)pDraw;
     if (pDestBuffer->attachment == DRI2BufferFrontLeft)
 	dst_pixmap = (PixmapPtr)pDraw;

     /*
      * The clients implements glXWaitX with a copy front to fake and then
      * waiting on the server to signal its completion of it. While
      * glXWaitGL is a client side flush and a copy from fake to front.
      * This is how it is done in the DRI2 protocol, how ever depending
      * which type of drawables the server does things a bit differently
      * then what the protocol says as the fake and front are the same.
      *
      * for pixmaps glXWaitX is a server flush.
      * for pixmaps glXWaitGL is a client flush.
      * for windows glXWaitX is a copy from front to fake then a server flush.
      * for windows glXWaitGL is a client flush then a copy from fake to front.
      *
      * XXX in the windows case this code always flushes but that isn't a
      * must in the glXWaitGL case but we don't know if this is a glXWaitGL
      * or a glFlush/glFinish call.
      */
     if (dst_pixmap == src_pixmap) {
 	/* pixmap glXWaitX */
 	if (pSrcBuffer->attachment == DRI2BufferFrontLeft &&
 	    pDestBuffer->attachment == DRI2BufferFakeFrontLeft) {
 	    ms->ctx->flush(ms->ctx, PIPE_FLUSH_SWAPBUFFERS, NULL);
 	    return;
 	}
 	/* pixmap glXWaitGL */
 	if (pDestBuffer->attachment == DRI2BufferFrontLeft &&
 	    pSrcBuffer->attachment == DRI2BufferFakeFrontLeft) {
 	    return;
 	} else {
 	    xf86DrvMsg(pScrn->scrnIndex, X_WARNING,
 		"copying between the same pixmap\n");
 	}
     }

     gc = GetScratchGC(pDraw->depth, pScreen);
     copy_clip = REGION_CREATE(pScreen, NULL, 0);
     REGION_COPY(pScreen, copy_clip, pRegion);
     (*gc->funcs->ChangeClip) (gc, CT_REGION, copy_clip, 0);
     ValidateGC(&dst_pixmap->drawable, gc);

     /* If this is a full buffer swap, throttle on the previous one */
     if (dst_priv->fence && REGION_NUM_RECTS(pRegion) == 1) {
 	BoxPtr extents = REGION_EXTENTS(pScreen, pRegion);

 	if (extents->x1 == 0 && extents->y1 == 0 &&
 	    extents->x2 == pDraw->width && extents->y2 == pDraw->height) {
 	    ms->screen->fence_finish(ms->screen, dst_priv->fence, 0);
 	    ms->screen->fence_reference(ms->screen, &dst_priv->fence, NULL);
 	}
     }

     (*gc->ops->CopyArea)(&src_pixmap->drawable, &dst_pixmap->drawable, gc,
 			 0, 0, pDraw->width, pDraw->height, 0, 0);

     FreeScratchGC(gc);

     ms->ctx->flush(ms->ctx, PIPE_FLUSH_SWAPBUFFERS,
 		   pDestBuffer->attachment == DRI2BufferFrontLeft ?
 		   &dst_priv->fence : NULL);
 }

 Bool
 driScreenInit(ScreenPtr pScreen)
 {
     ScrnInfoPtr pScrn = xf86Screens[pScreen->myNum];
     modesettingPtr ms = modesettingPTR(pScrn);
     DRI2InfoRec dri2info;

 #if defined(DRI2INFOREC_VERSION)
     dri2info.version = DRI2INFOREC_VERSION;
 #else
     dri2info.version = 1;
 #endif
     dri2info.fd = ms->fd;

     dri2info.driverName = pScrn->driverName;
     dri2info.deviceName = "/dev/dri/card0"; /* FIXME */

 #if defined(DRI2INFOREC_VERSION) && DRI2INFOREC_VERSION > 2
     dri2info.CreateBuffer = driCreateBuffer;
     dri2info.DestroyBuffer = driDestroyBuffer;
 #else
     dri2info.CreateBuffers = driCreateBuffers;
     dri2info.DestroyBuffers = driDestroyBuffers;
 #endif
     dri2info.CopyRegion = driCopyRegion;
     dri2info.Wait = NULL;

     ms->d_depth_bits_last =
 	 ms->screen->is_format_supported(ms->screen, PIPE_FORMAT_X8Z24_UNORM,
 					 PIPE_TEXTURE_2D,
 					 PIPE_TEXTURE_USAGE_DEPTH_STENCIL, 0);
     ms->ds_depth_bits_last =
 	 ms->screen->is_format_supported(ms->screen, PIPE_FORMAT_S8Z24_UNORM,
 					 PIPE_TEXTURE_2D,
 					 PIPE_TEXTURE_USAGE_DEPTH_STENCIL, 0);

     return DRI2ScreenInit(pScreen, &dri2info);
 }

 void
 driCloseScreen(ScreenPtr pScreen)
 {
     DRI2CloseScreen(pScreen);
 }

 /* vim: set sw=4 ts=8 sts=4: */
	/*
	* Copyright 2008 Tungsten Graphics, 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 TUNGSTEN GRAPHICS 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.
	*
	*
	* Author: Alan Hourihane <alanh@tungstengraphics.com>
	* Author: Jakob Bornecrantz <wallbraker@gmail.com>
	*
	*/

	#include "xorg-server.h"
	#include "xf86.h"
	#include "xf86_OSproc.h"

	#include "xorg_tracker.h"
	#include "xorg_exa.h"

	#include "dri2.h"

	#include "pipe/p_state.h"
	#include "pipe/p_inlines.h"

	#include "util/u_rect.h"

	typedef struct {
	PixmapPtr pPixmap;
	struct pipe_texture *tex;
	struct pipe_fence_handle *fence;
	} *BufferPrivatePtr;

	static Bool
	driDoCreateBuffer(DrawablePtr pDraw, DRI2BufferPtr buffer, unsigned int format)
	{
	struct pipe_texture *tex = NULL;
	ScreenPtr pScreen = pDraw->pScreen;
	ScrnInfoPtr pScrn = xf86Screens[pScreen->myNum];
	modesettingPtr ms = modesettingPTR(pScrn);
	struct exa_pixmap_priv *exa_priv;
	BufferPrivatePtr private = buffer->driverPrivate;
	PixmapPtr pPixmap;
	unsigned stride, handle;

	if (pDraw->type == DRAWABLE_PIXMAP)
	pPixmap = (PixmapPtr) pDraw;
	else
	pPixmap = (*pScreen->GetWindowPixmap)((WindowPtr) pDraw);
	exa_priv = exaGetPixmapDriverPrivate(pPixmap);

	switch (buffer->attachment) {
	default:
	if (buffer->attachment != DRI2BufferFakeFrontLeft \|\|
	pDraw->type != DRAWABLE_PIXMAP) {
	private->pPixmap = (*pScreen->CreatePixmap)(pScreen, pDraw->width,
	pDraw->height,
	pDraw->depth,
	0);
	}
	break;
	case DRI2BufferFrontLeft:
	break;
	case DRI2BufferStencil:
	#if defined(DRI2INFOREC_VERSION) && DRI2INFOREC_VERSION > 2
	case DRI2BufferDepthStencil:
	#else
	/* Works on old X servers because sanity checking is for the weak */
	case 9:
	#endif
	if (exa_priv->depth_stencil_tex &&
	!pf_is_depth_stencil(exa_priv->depth_stencil_tex->format))
	exa_priv->depth_stencil_tex = NULL;
	/* Fall through */
	case DRI2BufferDepth:
	if (exa_priv->depth_stencil_tex)
	pipe_texture_reference(&tex, exa_priv->depth_stencil_tex);
	else {
	struct pipe_texture template;
	memset(&template, 0, sizeof(template));
	template.target = PIPE_TEXTURE_2D;
	if (buffer->attachment == DRI2BufferDepth)
	template.format = ms->ds_depth_bits_last ?
	PIPE_FORMAT_X8Z24_UNORM : PIPE_FORMAT_Z24X8_UNORM;
	else
	template.format = ms->ds_depth_bits_last ?
	PIPE_FORMAT_S8Z24_UNORM : PIPE_FORMAT_Z24S8_UNORM;
	pf_get_block(template.format, &template.block);
	template.width[0] = pDraw->width;
	template.height[0] = pDraw->height;
	template.depth[0] = 1;
	template.last_level = 0;
	template.tex_usage = PIPE_TEXTURE_USAGE_DEPTH_STENCIL \|
	PIPE_TEXTURE_USAGE_DISPLAY_TARGET;
	tex = ms->screen->texture_create(ms->screen, &template);
	pipe_texture_reference(&exa_priv->depth_stencil_tex, tex);
	}
	break;
	}

	if (!private->pPixmap) {
	private->pPixmap = pPixmap;
	pPixmap->refcnt++;
	}

	if (!tex) {
	exaMoveInPixmap(private->pPixmap);
	xorg_exa_set_shared_usage(private->pPixmap);
	pScreen->ModifyPixmapHeader(private->pPixmap, 0, 0, 0, 0, 0, NULL);
	tex = xorg_exa_get_texture(private->pPixmap);
	}

	if (!tex)
	FatalError("NO TEXTURE IN DRI2\n");

	ms->api->shared_handle_from_texture(ms->api, ms->screen, tex, &stride, &handle);

	buffer->name = handle;
	buffer->pitch = stride;
	buffer->cpp = 4;
	buffer->driverPrivate = private;
	buffer->flags = 0; /* not tiled */
	private->tex = tex;

	return TRUE;
	}

	static void
	driDoDestroyBuffer(DrawablePtr pDraw, DRI2BufferPtr buffer)
	{
	ScreenPtr pScreen = pDraw->pScreen;
	ScrnInfoPtr pScrn = xf86Screens[pScreen->myNum];
	modesettingPtr ms = modesettingPTR(pScrn);
	BufferPrivatePtr private = buffer->driverPrivate;
	struct exa_pixmap_priv *exa_priv = exaGetPixmapDriverPrivate(private->pPixmap);

	pipe_texture_reference(&private->tex, NULL);
	ms->screen->fence_reference(ms->screen, &private->fence, NULL);
	pipe_texture_reference(&exa_priv->depth_stencil_tex, NULL);
	(*pScreen->DestroyPixmap)(private->pPixmap);
	}

	#if defined(DRI2INFOREC_VERSION) && DRI2INFOREC_VERSION > 2

	static DRI2BufferPtr
	driCreateBuffer(DrawablePtr pDraw, unsigned int attachment, unsigned int format)
	{
	DRI2BufferPtr buffer;
	BufferPrivatePtr private;

	buffer = xcalloc(1, sizeof *buffer);
	if (!buffer)
	return NULL;

	private = xcalloc(1, sizeof *private);
	if (!private) {
	goto fail;
	}

	buffer->attachment = attachment;
	buffer->driverPrivate = private;

	if (driDoCreateBuffer(pDraw, buffer, format))
	return buffer;

	xfree(private);
	fail:
	xfree(buffer);
	return NULL;
	}

	static void
	driDestroyBuffer(DrawablePtr pDraw, DRI2BufferPtr buffer)
	{
	driDoDestroyBuffer(pDraw, buffer);

	xfree(buffer->driverPrivate);
	xfree(buffer);
	}

	#else /* DRI2INFOREC_VERSION <= 2 */

	static DRI2BufferPtr
	driCreateBuffers(DrawablePtr pDraw, unsigned int *attachments, int count)
	{
	BufferPrivatePtr privates;
	DRI2BufferPtr buffers;
	int i;

	buffers = xcalloc(count, sizeof *buffers);
	if (!buffers)
	goto fail_buffers;

	privates = xcalloc(count, sizeof *privates);
	if (!privates)
	goto fail_privates;

	for (i = 0; i < count; i++) {
	buffers[i].attachment = attachments[i];
	buffers[i].driverPrivate = &privates[i];

	if (!driDoCreateBuffer(pDraw, &buffers[i], 0))
	goto fail;
	}

	return buffers;

	fail:
	xfree(privates);
	fail_privates:
	xfree(buffers);
	fail_buffers:
	return NULL;
	}

	static void
	driDestroyBuffers(DrawablePtr pDraw, DRI2BufferPtr buffers, int count)
	{
	int i;

	for (i = 0; i < count; i++) {
	driDoDestroyBuffer(pDraw, &buffers[i]);
	}

	if (buffers) {
	xfree(buffers[0].driverPrivate);
	xfree(buffers);
	}
	}

	#endif /* DRI2INFOREC_VERSION */

	static void
	driCopyRegion(DrawablePtr pDraw, RegionPtr pRegion,
	DRI2BufferPtr pDestBuffer, DRI2BufferPtr pSrcBuffer)
	{
	ScreenPtr pScreen = pDraw->pScreen;
	ScrnInfoPtr pScrn = xf86Screens[pScreen->myNum];
	modesettingPtr ms = modesettingPTR(pScrn);
	BufferPrivatePtr dst_priv = pDestBuffer->driverPrivate;
	BufferPrivatePtr src_priv = pSrcBuffer->driverPrivate;
	PixmapPtr src_pixmap;
	PixmapPtr dst_pixmap;
	GCPtr gc;
	RegionPtr copy_clip;

	/*
	* In driCreateBuffers we dewrap windows into the
	* backing pixmaps in order to get to the texture.
	* We need to use the real drawable in CopyArea
	* so that cliprects and offsets are correct.
	*/
	src_pixmap = src_priv->pPixmap;
	dst_pixmap = dst_priv->pPixmap;
	if (pSrcBuffer->attachment == DRI2BufferFrontLeft)
	src_pixmap = (PixmapPtr)pDraw;
	if (pDestBuffer->attachment == DRI2BufferFrontLeft)
	dst_pixmap = (PixmapPtr)pDraw;

	/*
	* The clients implements glXWaitX with a copy front to fake and then
	* waiting on the server to signal its completion of it. While
	* glXWaitGL is a client side flush and a copy from fake to front.
	* This is how it is done in the DRI2 protocol, how ever depending
	* which type of drawables the server does things a bit differently
	* then what the protocol says as the fake and front are the same.
	*
	* for pixmaps glXWaitX is a server flush.
	* for pixmaps glXWaitGL is a client flush.
	* for windows glXWaitX is a copy from front to fake then a server flush.
	* for windows glXWaitGL is a client flush then a copy from fake to front.
	*
	* XXX in the windows case this code always flushes but that isn't a
	* must in the glXWaitGL case but we don't know if this is a glXWaitGL
	* or a glFlush/glFinish call.
	*/
	if (dst_pixmap == src_pixmap) {
	/* pixmap glXWaitX */
	if (pSrcBuffer->attachment == DRI2BufferFrontLeft &&
	pDestBuffer->attachment == DRI2BufferFakeFrontLeft) {
	ms->ctx->flush(ms->ctx, PIPE_FLUSH_SWAPBUFFERS, NULL);
	return;
	}
	/* pixmap glXWaitGL */
	if (pDestBuffer->attachment == DRI2BufferFrontLeft &&
	pSrcBuffer->attachment == DRI2BufferFakeFrontLeft) {
	return;
	} else {
	xf86DrvMsg(pScrn->scrnIndex, X_WARNING,
	"copying between the same pixmap\n");
	}
	}

	gc = GetScratchGC(pDraw->depth, pScreen);
	copy_clip = REGION_CREATE(pScreen, NULL, 0);
	REGION_COPY(pScreen, copy_clip, pRegion);
	(*gc->funcs->ChangeClip) (gc, CT_REGION, copy_clip, 0);
	ValidateGC(&dst_pixmap->drawable, gc);

	/* If this is a full buffer swap, throttle on the previous one */
	if (dst_priv->fence && REGION_NUM_RECTS(pRegion) == 1) {
	BoxPtr extents = REGION_EXTENTS(pScreen, pRegion);

	if (extents->x1 == 0 && extents->y1 == 0 &&
	extents->x2 == pDraw->width && extents->y2 == pDraw->height) {
	ms->screen->fence_finish(ms->screen, dst_priv->fence, 0);
	ms->screen->fence_reference(ms->screen, &dst_priv->fence, NULL);
	}
	}

	(*gc->ops->CopyArea)(&src_pixmap->drawable, &dst_pixmap->drawable, gc,
	0, 0, pDraw->width, pDraw->height, 0, 0);

	FreeScratchGC(gc);

	ms->ctx->flush(ms->ctx, PIPE_FLUSH_SWAPBUFFERS,
	pDestBuffer->attachment == DRI2BufferFrontLeft ?
	&dst_priv->fence : NULL);
	}

	Bool
	driScreenInit(ScreenPtr pScreen)
	{
	ScrnInfoPtr pScrn = xf86Screens[pScreen->myNum];
	modesettingPtr ms = modesettingPTR(pScrn);
	DRI2InfoRec dri2info;

	#if defined(DRI2INFOREC_VERSION)
	dri2info.version = DRI2INFOREC_VERSION;
	#else
	dri2info.version = 1;
	#endif
	dri2info.fd = ms->fd;

	dri2info.driverName = pScrn->driverName;
	dri2info.deviceName = "/dev/dri/card0"; /* FIXME */

	#if defined(DRI2INFOREC_VERSION) && DRI2INFOREC_VERSION > 2
	dri2info.CreateBuffer = driCreateBuffer;
	dri2info.DestroyBuffer = driDestroyBuffer;
	#else
	dri2info.CreateBuffers = driCreateBuffers;
	dri2info.DestroyBuffers = driDestroyBuffers;
	#endif
	dri2info.CopyRegion = driCopyRegion;
	dri2info.Wait = NULL;

	ms->d_depth_bits_last =
	ms->screen->is_format_supported(ms->screen, PIPE_FORMAT_X8Z24_UNORM,
	PIPE_TEXTURE_2D,
	PIPE_TEXTURE_USAGE_DEPTH_STENCIL, 0);
	ms->ds_depth_bits_last =
	ms->screen->is_format_supported(ms->screen, PIPE_FORMAT_S8Z24_UNORM,
	PIPE_TEXTURE_2D,
	PIPE_TEXTURE_USAGE_DEPTH_STENCIL, 0);

	return DRI2ScreenInit(pScreen, &dri2info);
	}

	void
	driCloseScreen(ScreenPtr pScreen)
	{
	DRI2CloseScreen(pScreen);
	}

	/* vim: set sw=4 ts=8 sts=4: */