Synchronised line endinge with release branch

1 files changed, 1040 insertions, 1040 deletions

diff --git a/mesalib/src/mesa/drivers/dri/common/dri_util.c b/mesalib/src/mesa/drivers/dri/common/dri_util.c
index adc6716c6..6d6401934 100644
--- a/mesalib/src/mesa/drivers/dri/common/dri_util.c
+++ b/mesalib/src/mesa/drivers/dri/common/dri_util.c
@@ -1,1040 +1,1040 @@
-/**

- * \file dri_util.c

- * DRI utility functions.

- *

- * This module acts as glue between GLX and the actual hardware driver.  A DRI

- * driver doesn't really \e have to use any of this - it's optional.  But, some

- * useful stuff is done here that otherwise would have to be duplicated in most

- * drivers.

- * 

- * Basically, these utility functions take care of some of the dirty details of

- * screen initialization, context creation, context binding, DRM setup, etc.

- *

- * These functions are compiled into each DRI driver so libGL.so knows nothing

- * about them.

- */

-

-

-#include <assert.h>

-#include <stdarg.h>

-#include <unistd.h>

-#include <sys/mman.h>

-#include <stdio.h>

-

-#ifndef MAP_FAILED

-#define MAP_FAILED ((void *)-1)

-#endif

-

-#include "main/imports.h"

-#define None 0

-

-#include "dri_util.h"

-#include "drm_sarea.h"

-#include "utils.h"

-#include "xmlpool.h"

-#include "../glsl/glsl_parser_extras.h"

-

-PUBLIC const char __dri2ConfigOptions[] =

-   DRI_CONF_BEGIN

-      DRI_CONF_SECTION_PERFORMANCE

-         DRI_CONF_VBLANK_MODE(DRI_CONF_VBLANK_DEF_INTERVAL_1)

-      DRI_CONF_SECTION_END

-   DRI_CONF_END;

-

-static const uint __dri2NConfigOptions = 1;

-

-#ifndef GLX_OML_sync_control

-typedef GLboolean ( * PFNGLXGETMSCRATEOMLPROC) (__DRIdrawable *drawable, int32_t *numerator, int32_t *denominator);

-#endif

-

-static void dri_get_drawable(__DRIdrawable *pdp);

-static void dri_put_drawable(__DRIdrawable *pdp);

-

-/**

- * This is just a token extension used to signal that the driver

- * supports setting a read drawable.

- */

-const __DRIextension driReadDrawableExtension = {

-    __DRI_READ_DRAWABLE, __DRI_READ_DRAWABLE_VERSION

-};

-

-GLint

-driIntersectArea( drm_clip_rect_t rect1, drm_clip_rect_t rect2 )

-{

-   if (rect2.x1 > rect1.x1) rect1.x1 = rect2.x1;

-   if (rect2.x2 < rect1.x2) rect1.x2 = rect2.x2;

-   if (rect2.y1 > rect1.y1) rect1.y1 = rect2.y1;

-   if (rect2.y2 < rect1.y2) rect1.y2 = rect2.y2;

-

-   if (rect1.x1 > rect1.x2 || rect1.y1 > rect1.y2) return 0;

-

-   return (rect1.x2 - rect1.x1) * (rect1.y2 - rect1.y1);

-}

-

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

-/** \name Context (un)binding functions                          */

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

-/*@{*/

-

-/**

- * Unbind context.

- * 

- * \param scrn the screen.

- * \param gc context.

- *

- * \return \c GL_TRUE on success, or \c GL_FALSE on failure.

- * 

- * \internal

- * This function calls __DriverAPIRec::UnbindContext, and then decrements

- * __DRIdrawableRec::refcount which must be non-zero for a successful

- * return.

- * 

- * While casting the opaque private pointers associated with the parameters

- * into their respective real types it also assures they are not \c NULL. 

- */

-static int driUnbindContext(__DRIcontext *pcp)

-{

-    __DRIscreen *psp;

-    __DRIdrawable *pdp;

-    __DRIdrawable *prp;

-

-    /*

-    ** Assume error checking is done properly in glXMakeCurrent before

-    ** calling driUnbindContext.

-    */

-

-    if (pcp == NULL)

-        return GL_FALSE;

-

-    psp = pcp->driScreenPriv;

-    pdp = pcp->driDrawablePriv;

-    prp = pcp->driReadablePriv;

-

-    /* already unbound */

-    if (!pdp && !prp)

-      return GL_TRUE;

-    /* Let driver unbind drawable from context */

-    (*psp->DriverAPI.UnbindContext)(pcp);

-

-    assert(pdp);

-    if (pdp->refcount == 0) {

-	/* ERROR!!! */

-	return GL_FALSE;

-    }

-

-    dri_put_drawable(pdp);

-

-    if (prp != pdp) {

-        if (prp->refcount == 0) {

-	    /* ERROR!!! */

-	    return GL_FALSE;

-	}

-

-    	dri_put_drawable(prp);

-    }

-

-

-    /* XXX this is disabled so that if we call SwapBuffers on an unbound

-     * window we can determine the last context bound to the window and

-     * use that context's lock. (BrianP, 2-Dec-2000)

-     */

-    pcp->driDrawablePriv = pcp->driReadablePriv = NULL;

-

-    return GL_TRUE;

-}

-

-/**

- * This function takes both a read buffer and a draw buffer.  This is needed

- * for \c glXMakeCurrentReadSGI or GLX 1.3's \c glXMakeContextCurrent

- * function.

- */

-static int driBindContext(__DRIcontext *pcp,

-			  __DRIdrawable *pdp,

-			  __DRIdrawable *prp)

-{

-    __DRIscreen *psp = NULL;

-

-    /*

-    ** Assume error checking is done properly in glXMakeCurrent before

-    ** calling driUnbindContext.

-    */

-

-    if (!pcp)

-	return GL_FALSE;

-

-    /* Bind the drawable to the context */

-    psp = pcp->driScreenPriv;

-    pcp->driDrawablePriv = pdp;

-    pcp->driReadablePriv = prp;

-    if (pdp) {

-	pdp->driContextPriv = pcp;

-	dri_get_drawable(pdp);

-    }

-    if (prp && pdp != prp) {

-	dri_get_drawable(prp);

-    }

-

-    /*

-    ** Now that we have a context associated with this drawable, we can

-    ** initialize the drawable information if has not been done before.

-    */

-

-    if (!psp->dri2.enabled) {

-	if (pdp && !pdp->pStamp) {

-	    DRM_SPINLOCK(&psp->pSAREA->drawable_lock, psp->drawLockID);

-	    __driUtilUpdateDrawableInfo(pdp);

-	    DRM_SPINUNLOCK(&psp->pSAREA->drawable_lock, psp->drawLockID);

-	}

-	if (prp && pdp != prp && !prp->pStamp) {

-	    DRM_SPINLOCK(&psp->pSAREA->drawable_lock, psp->drawLockID);

-	    __driUtilUpdateDrawableInfo(prp);

-	    DRM_SPINUNLOCK(&psp->pSAREA->drawable_lock, psp->drawLockID);

-        }

-    }

-

-    /* Call device-specific MakeCurrent */

-    return (*psp->DriverAPI.MakeCurrent)(pcp, pdp, prp);

-}

-

-/*@}*/

-

-

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

-/** \name Drawable handling functions                            */

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

-/*@{*/

-

-/**

- * Update private drawable information.

- *

- * \param pdp pointer to the private drawable information to update.

- * 

- * This function basically updates the __DRIdrawable struct's

- * cliprect information by calling \c __DRIinterfaceMethods::getDrawableInfo.

- * This is usually called by the DRI_VALIDATE_DRAWABLE_INFO macro which

- * compares the __DRIdrwablePrivate pStamp and lastStamp values.  If

- * the values are different that means we have to update the clipping

- * info.

- */

-void

-__driUtilUpdateDrawableInfo(__DRIdrawable *pdp)

-{

-    __DRIscreen *psp = pdp->driScreenPriv;

-    __DRIcontext *pcp = pdp->driContextPriv;

-    

-    if (!pcp 

-	|| ((pdp != pcp->driDrawablePriv) && (pdp != pcp->driReadablePriv))) {

-	/* ERROR!!! 

-	 * ...but we must ignore it. There can be many contexts bound to a

-	 * drawable.

-	 */

-    }

-

-    if (pdp->pClipRects) {

-	free(pdp->pClipRects); 

-	pdp->pClipRects = NULL;

-    }

-

-    if (pdp->pBackClipRects) {

-	free(pdp->pBackClipRects); 

-	pdp->pBackClipRects = NULL;

-    }

-

-    DRM_SPINUNLOCK(&psp->pSAREA->drawable_lock, psp->drawLockID);

-

-    if (! (*psp->getDrawableInfo->getDrawableInfo)(pdp,

-			  &pdp->index, &pdp->lastStamp,

-			  &pdp->x, &pdp->y, &pdp->w, &pdp->h,

-			  &pdp->numClipRects, &pdp->pClipRects,

-			  &pdp->backX,

-			  &pdp->backY,

-			  &pdp->numBackClipRects,

-			  &pdp->pBackClipRects,

-			  pdp->loaderPrivate)) {

-	/* Error -- eg the window may have been destroyed.  Keep going

-	 * with no cliprects.

-	 */

-        pdp->pStamp = &pdp->lastStamp; /* prevent endless loop */

-	pdp->numClipRects = 0;

-	pdp->pClipRects = NULL;

-	pdp->numBackClipRects = 0;

-	pdp->pBackClipRects = NULL;

-    }

-    else

-       pdp->pStamp = &(psp->pSAREA->drawableTable[pdp->index].stamp);

-

-    DRM_SPINLOCK(&psp->pSAREA->drawable_lock, psp->drawLockID);

-}

-

-/*@}*/

-

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

-/** \name GLX callbacks                                          */

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

-/*@{*/

-

-static void driReportDamage(__DRIdrawable *pdp,

-			    struct drm_clip_rect *pClipRects, int numClipRects)

-{

-    __DRIscreen *psp = pdp->driScreenPriv;

-

-    /* Check that we actually have the new damage report method */

-    if (psp->damage) {

-	/* Report the damage.  Currently, all our drivers draw

-	 * directly to the front buffer, so we report the damage there

-	 * rather than to the backing storein (if any).

-	 */

-	(*psp->damage->reportDamage)(pdp,

-				     pdp->x, pdp->y,

-				     pClipRects, numClipRects,

-				     GL_TRUE, pdp->loaderPrivate);

-    }

-}

-

-

-/**

- * Swap buffers.

- *

- * \param drawablePrivate opaque pointer to the per-drawable private info.

- * 

- * \internal

- * This function calls __DRIdrawable::swapBuffers.

- * 

- * Is called directly from glXSwapBuffers().

- */

-static void driSwapBuffers(__DRIdrawable *dPriv)

-{

-    __DRIscreen *psp = dPriv->driScreenPriv;

-    drm_clip_rect_t *rects;

-    int i;

-

-    psp->DriverAPI.SwapBuffers(dPriv);

-

-    if (!dPriv->numClipRects)

-        return;

-

-    rects = malloc(sizeof(*rects) * dPriv->numClipRects);

-

-    if (!rects)

-        return;

-

-    for (i = 0; i < dPriv->numClipRects; i++) {

-        rects[i].x1 = dPriv->pClipRects[i].x1 - dPriv->x;

-        rects[i].y1 = dPriv->pClipRects[i].y1 - dPriv->y;

-        rects[i].x2 = dPriv->pClipRects[i].x2 - dPriv->x;

-        rects[i].y2 = dPriv->pClipRects[i].y2 - dPriv->y;

-    }

-

-    driReportDamage(dPriv, rects, dPriv->numClipRects);

-    free(rects);

-}

-

-static int driDrawableGetMSC( __DRIscreen *sPriv, __DRIdrawable *dPriv,

-			      int64_t *msc )

-{

-    return sPriv->DriverAPI.GetDrawableMSC(sPriv, dPriv, msc);

-}

-

-

-static int driWaitForMSC(__DRIdrawable *dPriv, int64_t target_msc,

-			 int64_t divisor, int64_t remainder,

-			 int64_t * msc, int64_t * sbc)

-{

-    __DRIswapInfo  sInfo;

-    int  status;

-

-    status = dPriv->driScreenPriv->DriverAPI.WaitForMSC( dPriv, target_msc,

-                                                         divisor, remainder,

-                                                         msc );

-

-    /* GetSwapInfo() may not be provided by the driver if GLX_SGI_video_sync

-     * is supported but GLX_OML_sync_control is not.  Therefore, don't return

-     * an error value if GetSwapInfo() is not implemented.

-    */

-    if ( status == 0

-         && dPriv->driScreenPriv->DriverAPI.GetSwapInfo ) {

-        status = dPriv->driScreenPriv->DriverAPI.GetSwapInfo( dPriv, & sInfo );

-        *sbc = sInfo.swap_count;

-    }

-

-    return status;

-}

-

-

-const __DRImediaStreamCounterExtension driMediaStreamCounterExtension = {

-    { __DRI_MEDIA_STREAM_COUNTER, __DRI_MEDIA_STREAM_COUNTER_VERSION },

-    driWaitForMSC,

-    driDrawableGetMSC,

-};

-

-

-static void driCopySubBuffer(__DRIdrawable *dPriv,

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

-{

-    drm_clip_rect_t rect;

-

-    rect.x1 = x;

-    rect.y1 = dPriv->h - y - h;

-    rect.x2 = x + w;

-    rect.y2 = rect.y1 + h;

-    driReportDamage(dPriv, &rect, 1);

-

-    dPriv->driScreenPriv->DriverAPI.CopySubBuffer(dPriv, x, y, w, h);

-}

-

-const __DRIcopySubBufferExtension driCopySubBufferExtension = {

-    { __DRI_COPY_SUB_BUFFER, __DRI_COPY_SUB_BUFFER_VERSION },

-    driCopySubBuffer

-};

-

-static void driSetSwapInterval(__DRIdrawable *dPriv, unsigned int interval)

-{

-    dPriv->swap_interval = interval;

-}

-

-static unsigned int driGetSwapInterval(__DRIdrawable *dPriv)

-{

-    return dPriv->swap_interval;

-}

-

-const __DRIswapControlExtension driSwapControlExtension = {

-    { __DRI_SWAP_CONTROL, __DRI_SWAP_CONTROL_VERSION },

-    driSetSwapInterval,

-    driGetSwapInterval

-};

-

-

-/**

- * This is called via __DRIscreenRec's createNewDrawable pointer.

- */

-static __DRIdrawable *

-driCreateNewDrawable(__DRIscreen *psp, const __DRIconfig *config,

-		     drm_drawable_t hwDrawable, int renderType,

-		     const int *attrs, void *data)

-{

-    __DRIdrawable *pdp;

-

-    /* Since pbuffers are not yet supported, no drawable attributes are

-     * supported either.

-     */

-    (void) attrs;

-    (void) renderType;

-

-    pdp = malloc(sizeof *pdp);

-    if (!pdp) {

-	return NULL;

-    }

-

-    pdp->driContextPriv = NULL;

-    pdp->loaderPrivate = data;

-    pdp->hHWDrawable = hwDrawable;

-    pdp->refcount = 1;

-    pdp->pStamp = NULL;

-    pdp->lastStamp = 0;

-    pdp->index = 0;

-    pdp->x = 0;

-    pdp->y = 0;

-    pdp->w = 0;

-    pdp->h = 0;

-    pdp->numClipRects = 0;

-    pdp->numBackClipRects = 0;

-    pdp->pClipRects = NULL;

-    pdp->pBackClipRects = NULL;

-    pdp->vblSeq = 0;

-    pdp->vblFlags = 0;

-

-    pdp->driScreenPriv = psp;

-

-    if (!(*psp->DriverAPI.CreateBuffer)(psp, pdp, &config->modes, 0)) {

-       free(pdp);

-       return NULL;

-    }

-

-    pdp->msc_base = 0;

-

-    /* This special default value is replaced with the configured

-     * default value when the drawable is first bound to a direct

-     * rendering context. 

-     */

-    pdp->swap_interval = (unsigned)-1;

-

-    return pdp;

-}

-

-

-static __DRIdrawable *

-dri2CreateNewDrawable(__DRIscreen *screen,

-		      const __DRIconfig *config,

-		      void *loaderPrivate)

-{

-    __DRIdrawable *pdraw;

-

-    pdraw = driCreateNewDrawable(screen, config, 0, 0, NULL, loaderPrivate);

-    if (!pdraw)

-    	return NULL;

-

-    pdraw->pClipRects = &pdraw->dri2.clipRect;

-    pdraw->pBackClipRects = &pdraw->dri2.clipRect;

-

-    pdraw->pStamp = &pdraw->dri2.stamp;

-    *pdraw->pStamp = pdraw->lastStamp + 1;

-

-    return pdraw;

-}

-

-static __DRIbuffer *

-dri2AllocateBuffer(__DRIscreen *screen,

-		   unsigned int attachment, unsigned int format,

-		   int width, int height)

-{

-    return (*screen->DriverAPI.AllocateBuffer)(screen, attachment, format,

-					       width, height);

-}

-

-static void

-dri2ReleaseBuffer(__DRIscreen *screen, __DRIbuffer *buffer)

-{

-   (*screen->DriverAPI.ReleaseBuffer)(screen, buffer);

-}

-

-

-static int

-dri2ConfigQueryb(__DRIscreen *screen, const char *var, GLboolean *val)

-{

-   if (!driCheckOption(&screen->optionCache, var, DRI_BOOL))

-      return -1;

-

-   *val = driQueryOptionb(&screen->optionCache, var);

-

-   return 0;

-}

-

-static int

-dri2ConfigQueryi(__DRIscreen *screen, const char *var, GLint *val)

-{

-   if (!driCheckOption(&screen->optionCache, var, DRI_INT) &&

-       !driCheckOption(&screen->optionCache, var, DRI_ENUM))

-      return -1;

-

-    *val = driQueryOptioni(&screen->optionCache, var);

-

-    return 0;

-}

-

-static int

-dri2ConfigQueryf(__DRIscreen *screen, const char *var, GLfloat *val)

-{

-   if (!driCheckOption(&screen->optionCache, var, DRI_FLOAT))

-      return -1;

-

-    *val = driQueryOptionf(&screen->optionCache, var);

-

-    return 0;

-}

-

-

-static void dri_get_drawable(__DRIdrawable *pdp)

-{

-    pdp->refcount++;

-}

-	

-static void dri_put_drawable(__DRIdrawable *pdp)

-{

-    __DRIscreen *psp;

-

-    if (pdp) {

-	pdp->refcount--;

-	if (pdp->refcount)

-	    return;

-

-	psp = pdp->driScreenPriv;

-        (*psp->DriverAPI.DestroyBuffer)(pdp);

-	if (pdp->pClipRects && pdp->pClipRects != &pdp->dri2.clipRect) {

-	    free(pdp->pClipRects);

-	    pdp->pClipRects = NULL;

-	}

-	if (pdp->pBackClipRects && pdp->pClipRects != &pdp->dri2.clipRect) {

-	    free(pdp->pBackClipRects);

-	    pdp->pBackClipRects = NULL;

-	}

-	free(pdp);

-    }

-}

-

-static void

-driDestroyDrawable(__DRIdrawable *pdp)

-{

-    dri_put_drawable(pdp);

-}

-

-/*@}*/

-

-

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

-/** \name Context handling functions                             */

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

-/*@{*/

-

-/**

- * Destroy the per-context private information.

- * 

- * \internal

- * This function calls __DriverAPIRec::DestroyContext on \p contextPrivate, calls

- * drmDestroyContext(), and finally frees \p contextPrivate.

- */

-static void

-driDestroyContext(__DRIcontext *pcp)

-{

-    if (pcp) {

-	(*pcp->driScreenPriv->DriverAPI.DestroyContext)(pcp);

-	free(pcp);

-    }

-}

-

-

-/**

- * Create the per-drawable private driver information.

- * 

- * \param render_type   Type of rendering target.  \c GLX_RGBA_TYPE is the only

- *                      type likely to ever be supported for direct-rendering.

- *                      However, \c GLX_RGBA_FLOAT_TYPE_ARB may eventually be

- *                      supported by some drivers.

- * \param shared        Context with which to share textures, etc. or NULL

- *

- * \returns An opaque pointer to the per-context private information on

- *          success, or \c NULL on failure.

- * 

- * \internal

- * This function allocates and fills a __DRIcontextRec structure.  It

- * performs some device independent initialization and passes all the

- * relevent information to __DriverAPIRec::CreateContext to create the

- * context.

- *

- */

-static __DRIcontext *

-driCreateNewContext(__DRIscreen *psp, const __DRIconfig *config,

-		    int render_type, __DRIcontext *shared, 

-		    drm_context_t hwContext, void *data)

-{

-    __DRIcontext *pcp;

-    void * const shareCtx = (shared != NULL) ? shared->driverPrivate : NULL;

-

-    (void) render_type;

-

-    pcp = malloc(sizeof *pcp);

-    if (!pcp)

-	return NULL;

-

-    pcp->driScreenPriv = psp;

-    pcp->driDrawablePriv = NULL;

-    pcp->loaderPrivate = data;

-    

-    pcp->dri2.draw_stamp = 0;

-    pcp->dri2.read_stamp = 0;

-

-    pcp->hHWContext = hwContext;

-

-    if ( !(*psp->DriverAPI.CreateContext)(API_OPENGL,

-					  &config->modes, pcp, shareCtx) ) {

-        free(pcp);

-        return NULL;

-    }

-

-    return pcp;

-}

-

-static unsigned int

-dri2GetAPIMask(__DRIscreen *screen)

-{

-    return screen->api_mask;

-}

-

-static __DRIcontext *

-dri2CreateNewContextForAPI(__DRIscreen *screen, int api,

-			   const __DRIconfig *config,

-			   __DRIcontext *shared, void *data)

-{

-    __DRIcontext *context;

-    const struct gl_config *modes = (config != NULL) ? &config->modes : NULL;

-    void *shareCtx = (shared != NULL) ? shared->driverPrivate : NULL;

-    gl_api mesa_api;

-

-    if (!(screen->api_mask & (1 << api)))

-	return NULL;

-

-    switch (api) {

-    case __DRI_API_OPENGL:

-	    mesa_api = API_OPENGL;

-	    break;

-    case __DRI_API_GLES:

-	    mesa_api = API_OPENGLES;

-	    break;

-    case __DRI_API_GLES2:

-	    mesa_api = API_OPENGLES2;

-	    break;

-    default:

-	    return NULL;

-    }

-

-    context = malloc(sizeof *context);

-    if (!context)

-	return NULL;

-

-    context->driScreenPriv = screen;

-    context->driDrawablePriv = NULL;

-    context->loaderPrivate = data;

-    

-    if (!(*screen->DriverAPI.CreateContext)(mesa_api, modes,

-					    context, shareCtx) ) {

-        free(context);

-        return NULL;

-    }

-

-    return context;

-}

-

-

-static __DRIcontext *

-dri2CreateNewContext(__DRIscreen *screen, const __DRIconfig *config,

-		      __DRIcontext *shared, void *data)

-{

-   return dri2CreateNewContextForAPI(screen, __DRI_API_OPENGL,

-				     config, shared, data);

-}

-

-static int

-driCopyContext(__DRIcontext *dest, __DRIcontext *src, unsigned long mask)

-{

-    (void) dest;

-    (void) src;

-    (void) mask;

-    return GL_FALSE;

-}

-

-/*@}*/

-

-

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

-/** \name Screen handling functions                              */

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

-/*@{*/

-

-/**

- * Destroy the per-screen private information.

- * 

- * \internal

- * This function calls __DriverAPIRec::DestroyScreen on \p screenPrivate, calls

- * drmClose(), and finally frees \p screenPrivate.

- */

-static void driDestroyScreen(__DRIscreen *psp)

-{

-    if (psp) {

-	/* No interaction with the X-server is possible at this point.  This

-	 * routine is called after XCloseDisplay, so there is no protocol

-	 * stream open to the X-server anymore.

-	 */

-

-       _mesa_destroy_shader_compiler();

-

-	if (psp->DriverAPI.DestroyScreen)

-	    (*psp->DriverAPI.DestroyScreen)(psp);

-

-	if (!psp->dri2.enabled) {

-	   (void)drmUnmap((drmAddress)psp->pSAREA, SAREA_MAX);

-	   (void)drmUnmap((drmAddress)psp->pFB, psp->fbSize);

-	   (void)drmCloseOnce(psp->fd);

-	} else {

-	   driDestroyOptionCache(&psp->optionCache);

-	   driDestroyOptionInfo(&psp->optionInfo);

-	}

-

-	free(psp);

-    }

-}

-

-static void

-setupLoaderExtensions(__DRIscreen *psp,

-		      const __DRIextension **extensions)

-{

-    int i;

-

-    for (i = 0; extensions[i]; i++) {

-	if (strcmp(extensions[i]->name, __DRI_GET_DRAWABLE_INFO) == 0)

-	    psp->getDrawableInfo = (__DRIgetDrawableInfoExtension *) extensions[i];

-	if (strcmp(extensions[i]->name, __DRI_DAMAGE) == 0)

-	    psp->damage = (__DRIdamageExtension *) extensions[i];

-	if (strcmp(extensions[i]->name, __DRI_SYSTEM_TIME) == 0)

-	    psp->systemTime = (__DRIsystemTimeExtension *) extensions[i];

-	if (strcmp(extensions[i]->name, __DRI_DRI2_LOADER) == 0)

-	    psp->dri2.loader = (__DRIdri2LoaderExtension *) extensions[i];

-	if (strcmp(extensions[i]->name, __DRI_IMAGE_LOOKUP) == 0)

-	    psp->dri2.image = (__DRIimageLookupExtension *) extensions[i];

-	if (strcmp(extensions[i]->name, __DRI_USE_INVALIDATE) == 0)

-	    psp->dri2.useInvalidate = (__DRIuseInvalidateExtension *) extensions[i];

-    }

-}

-

-/**

- * This is the bootstrap function for the driver.  libGL supplies all of the

- * requisite information about the system, and the driver initializes itself.

- * This routine also fills in the linked list pointed to by \c driver_modes

- * with the \c struct gl_config that the driver can support for windows or

- * pbuffers.

- *

- * For legacy DRI.

- * 

- * \param scrn  Index of the screen

- * \param ddx_version Version of the 2D DDX.  This may not be meaningful for

- *                    all drivers.

- * \param dri_version Version of the "server-side" DRI.

- * \param drm_version Version of the kernel DRM.

- * \param frame_buffer Data describing the location and layout of the

- *                     framebuffer.

- * \param pSAREA       Pointer to the SAREA.

- * \param fd           Device handle for the DRM.

- * \param extensions   ??

- * \param driver_modes  Returns modes suppoted by the driver

- * \param loaderPrivate  ??

- * 

- * \note There is no need to check the minimum API version in this

- * function.  Since the name of this function is versioned, it is

- * impossible for a loader that is too old to even load this driver.

- */

-static __DRIscreen *

-driCreateNewScreen(int scrn,

-		   const __DRIversion *ddx_version,

-		   const __DRIversion *dri_version,

-		   const __DRIversion *drm_version,

-		   const __DRIframebuffer *frame_buffer,

-		   drmAddress pSAREA, int fd, 

-		   const __DRIextension **extensions,

-		   const __DRIconfig ***driver_modes,

-		   void *loaderPrivate)

-{

-    static const __DRIextension *emptyExtensionList[] = { NULL };

-    __DRIscreen *psp;

-

-    (void) loaderPrivate;

-

-    if (driDriverAPI.InitScreen == NULL)

-	return NULL;

-

-    psp = calloc(1, sizeof *psp);

-    if (!psp)

-	return NULL;

-

-    setupLoaderExtensions(psp, extensions);

-

-    /*

-    ** NOT_DONE: This is used by the X server to detect when the client

-    ** has died while holding the drawable lock.  The client sets the

-    ** drawable lock to this value.

-    */

-    psp->drawLockID = 1;

-

-    psp->drm_version = *drm_version;

-    psp->ddx_version = *ddx_version;

-    psp->dri_version = *dri_version;

-

-    psp->pSAREA = pSAREA;

-    psp->lock = (drmLock *) &psp->pSAREA->lock;

-

-    psp->pFB = frame_buffer->base;

-    psp->fbSize = frame_buffer->size;

-    psp->fbStride = frame_buffer->stride;

-    psp->fbWidth = frame_buffer->width;

-    psp->fbHeight = frame_buffer->height;

-    psp->devPrivSize = frame_buffer->dev_priv_size;

-    psp->pDevPriv = frame_buffer->dev_priv;

-    psp->fbBPP = psp->fbStride * 8 / frame_buffer->width;

-

-    psp->extensions = emptyExtensionList;

-    psp->fd = fd;

-    psp->myNum = scrn;

-    psp->dri2.enabled = GL_FALSE;

-

-    psp->DriverAPI = driDriverAPI;

-    psp->api_mask = (1 << __DRI_API_OPENGL);

-

-    *driver_modes = driDriverAPI.InitScreen(psp);

-    if (*driver_modes == NULL) {

-	free(psp);

-	return NULL;

-    }

-

-    return psp;

-}

-

-/**

- * DRI2

- */

-static __DRIscreen *

-dri2CreateNewScreen(int scrn, int fd,

-		    const __DRIextension **extensions,

-		    const __DRIconfig ***driver_configs, void *data)

-{

-    static const __DRIextension *emptyExtensionList[] = { NULL };

-    __DRIscreen *psp;

-    drmVersionPtr version;

-

-    if (driDriverAPI.InitScreen2 == NULL)

-        return NULL;

-

-    psp = calloc(1, sizeof(*psp));

-    if (!psp)

-	return NULL;

-

-    setupLoaderExtensions(psp, extensions);

-

-    version = drmGetVersion(fd);

-    if (version) {

-	psp->drm_version.major = version->version_major;

-	psp->drm_version.minor = version->version_minor;

-	psp->drm_version.patch = version->version_patchlevel;

-	drmFreeVersion(version);

-    }

-

-    psp->extensions = emptyExtensionList;

-    psp->fd = fd;

-    psp->myNum = scrn;

-    psp->dri2.enabled = GL_TRUE;

-

-    psp->DriverAPI = driDriverAPI;

-    psp->api_mask = (1 << __DRI_API_OPENGL);

-    *driver_configs = driDriverAPI.InitScreen2(psp);

-    if (*driver_configs == NULL) {

-	free(psp);

-	return NULL;

-    }

-

-    psp->DriverAPI = driDriverAPI;

-    psp->loaderPrivate = data;

-

-    driParseOptionInfo(&psp->optionInfo, __dri2ConfigOptions,

-		       __dri2NConfigOptions);

-    driParseConfigFiles(&psp->optionCache, &psp->optionInfo, psp->myNum,

-			"dri2");

-

-    return psp;

-}

-

-static const __DRIextension **driGetExtensions(__DRIscreen *psp)

-{

-    return psp->extensions;

-}

-

-/** Core interface */

-const __DRIcoreExtension driCoreExtension = {

-    { __DRI_CORE, __DRI_CORE_VERSION },

-    NULL,

-    driDestroyScreen,

-    driGetExtensions,

-    driGetConfigAttrib,

-    driIndexConfigAttrib,

-    NULL,

-    driDestroyDrawable,

-    driSwapBuffers,

-    NULL,

-    driCopyContext,

-    driDestroyContext,

-    driBindContext,

-    driUnbindContext

-};

-

-/** Legacy DRI interface */

-const __DRIlegacyExtension driLegacyExtension = {

-    { __DRI_LEGACY, __DRI_LEGACY_VERSION },

-    driCreateNewScreen,

-    driCreateNewDrawable,

-    driCreateNewContext,

-};

-

-/** DRI2 interface */

-const __DRIdri2Extension driDRI2Extension = {

-    { __DRI_DRI2, __DRI_DRI2_VERSION },

-    dri2CreateNewScreen,

-    dri2CreateNewDrawable,

-    dri2CreateNewContext,

-    dri2GetAPIMask,

-    dri2CreateNewContextForAPI,

-    dri2AllocateBuffer,

-    dri2ReleaseBuffer

-};

-

-const __DRI2configQueryExtension dri2ConfigQueryExtension = {

-   { __DRI2_CONFIG_QUERY, __DRI2_CONFIG_QUERY_VERSION },

-   dri2ConfigQueryb,

-   dri2ConfigQueryi,

-   dri2ConfigQueryf,

-};

-

-/**

- * Calculate amount of swap interval used between GLX buffer swaps.

- * 

- * The usage value, on the range [0,max], is the fraction of total swap

- * interval time used between GLX buffer swaps is calculated.

- *

- *            \f$p = t_d / (i * t_r)\f$

- * 

- * Where \f$t_d\f$ is the time since the last GLX buffer swap, \f$i\f$ is the

- * swap interval (as set by \c glXSwapIntervalSGI), and \f$t_r\f$ time

- * required for a single vertical refresh period (as returned by \c

- * glXGetMscRateOML).

- * 

- * See the documentation for the GLX_MESA_swap_frame_usage extension for more

- * details.

- *

- * \param   dPriv  Pointer to the private drawable structure.

- * \return  If less than a single swap interval time period was required

- *          between GLX buffer swaps, a number greater than 0 and less than

- *          1.0 is returned.  If exactly one swap interval time period is

- *          required, 1.0 is returned, and if more than one is required then

- *          a number greater than 1.0 will be returned.

- *

- * \sa glXSwapIntervalSGI glXGetMscRateOML

- * 

- * \todo Instead of caching the \c glXGetMscRateOML function pointer, would it

- *       be possible to cache the sync rate?

- */

-float

-driCalculateSwapUsage( __DRIdrawable *dPriv, int64_t last_swap_ust,

-		       int64_t current_ust )

-{

-   int32_t   n;

-   int32_t   d;

-   int       interval;

-   float     usage = 1.0;

-   __DRIscreen *psp = dPriv->driScreenPriv;

-

-   if ( (*psp->systemTime->getMSCRate)(dPriv, &n, &d, dPriv->loaderPrivate) ) {

-      interval = (dPriv->swap_interval != 0) ? dPriv->swap_interval : 1;

-

-

-      /* We want to calculate

-       * (current_UST - last_swap_UST) / (interval * us_per_refresh).  We get

-       * current_UST by calling __glXGetUST.  last_swap_UST is stored in

-       * dPriv->swap_ust.  interval has already been calculated.

-       *

-       * The only tricky part is us_per_refresh.  us_per_refresh is

-       * 1000000 / MSC_rate.  We know the MSC_rate is n / d.  We can flip it

-       * around and say us_per_refresh = 1000000 * d / n.  Since this goes in

-       * the denominator of the final calculation, we calculate

-       * (interval * 1000000 * d) and move n into the numerator.

-       */

-

-      usage = (current_ust - last_swap_ust);

-      usage *= n;

-      usage /= (interval * d);

-      usage /= 1000000.0;

-   }

-   

-   return usage;

-}

-

-void

-dri2InvalidateDrawable(__DRIdrawable *drawable)

-{

-    drawable->dri2.stamp++;

-}

-

-/*@}*/

+/**
+ * \file dri_util.c
+ * DRI utility functions.
+ *
+ * This module acts as glue between GLX and the actual hardware driver.  A DRI
+ * driver doesn't really \e have to use any of this - it's optional.  But, some
+ * useful stuff is done here that otherwise would have to be duplicated in most
+ * drivers.
+ * 
+ * Basically, these utility functions take care of some of the dirty details of
+ * screen initialization, context creation, context binding, DRM setup, etc.
+ *
+ * These functions are compiled into each DRI driver so libGL.so knows nothing
+ * about them.
+ */
+
+
+#include <assert.h>
+#include <stdarg.h>
+#include <unistd.h>
+#include <sys/mman.h>
+#include <stdio.h>
+
+#ifndef MAP_FAILED
+#define MAP_FAILED ((void *)-1)
+#endif
+
+#include "main/imports.h"
+#define None 0
+
+#include "dri_util.h"
+#include "drm_sarea.h"
+#include "utils.h"
+#include "xmlpool.h"
+#include "../glsl/glsl_parser_extras.h"
+
+PUBLIC const char __dri2ConfigOptions[] =
+   DRI_CONF_BEGIN
+      DRI_CONF_SECTION_PERFORMANCE
+         DRI_CONF_VBLANK_MODE(DRI_CONF_VBLANK_DEF_INTERVAL_1)
+      DRI_CONF_SECTION_END
+   DRI_CONF_END;
+
+static const uint __dri2NConfigOptions = 1;
+
+#ifndef GLX_OML_sync_control
+typedef GLboolean ( * PFNGLXGETMSCRATEOMLPROC) (__DRIdrawable *drawable, int32_t *numerator, int32_t *denominator);
+#endif
+
+static void dri_get_drawable(__DRIdrawable *pdp);
+static void dri_put_drawable(__DRIdrawable *pdp);
+
+/**
+ * This is just a token extension used to signal that the driver
+ * supports setting a read drawable.
+ */
+const __DRIextension driReadDrawableExtension = {
+    __DRI_READ_DRAWABLE, __DRI_READ_DRAWABLE_VERSION
+};
+
+GLint
+driIntersectArea( drm_clip_rect_t rect1, drm_clip_rect_t rect2 )
+{
+   if (rect2.x1 > rect1.x1) rect1.x1 = rect2.x1;
+   if (rect2.x2 < rect1.x2) rect1.x2 = rect2.x2;
+   if (rect2.y1 > rect1.y1) rect1.y1 = rect2.y1;
+   if (rect2.y2 < rect1.y2) rect1.y2 = rect2.y2;
+
+   if (rect1.x1 > rect1.x2 || rect1.y1 > rect1.y2) return 0;
+
+   return (rect1.x2 - rect1.x1) * (rect1.y2 - rect1.y1);
+}
+
+/*****************************************************************/
+/** \name Context (un)binding functions                          */
+/*****************************************************************/
+/*@{*/
+
+/**
+ * Unbind context.
+ * 
+ * \param scrn the screen.
+ * \param gc context.
+ *
+ * \return \c GL_TRUE on success, or \c GL_FALSE on failure.
+ * 
+ * \internal
+ * This function calls __DriverAPIRec::UnbindContext, and then decrements
+ * __DRIdrawableRec::refcount which must be non-zero for a successful
+ * return.
+ * 
+ * While casting the opaque private pointers associated with the parameters
+ * into their respective real types it also assures they are not \c NULL. 
+ */
+static int driUnbindContext(__DRIcontext *pcp)
+{
+    __DRIscreen *psp;
+    __DRIdrawable *pdp;
+    __DRIdrawable *prp;
+
+    /*
+    ** Assume error checking is done properly in glXMakeCurrent before
+    ** calling driUnbindContext.
+    */
+
+    if (pcp == NULL)
+        return GL_FALSE;
+
+    psp = pcp->driScreenPriv;
+    pdp = pcp->driDrawablePriv;
+    prp = pcp->driReadablePriv;
+
+    /* already unbound */
+    if (!pdp && !prp)
+      return GL_TRUE;
+    /* Let driver unbind drawable from context */
+    (*psp->DriverAPI.UnbindContext)(pcp);
+
+    assert(pdp);
+    if (pdp->refcount == 0) {
+	/* ERROR!!! */
+	return GL_FALSE;
+    }
+
+    dri_put_drawable(pdp);
+
+    if (prp != pdp) {
+        if (prp->refcount == 0) {
+	    /* ERROR!!! */
+	    return GL_FALSE;
+	}
+
+    	dri_put_drawable(prp);
+    }
+
+
+    /* XXX this is disabled so that if we call SwapBuffers on an unbound
+     * window we can determine the last context bound to the window and
+     * use that context's lock. (BrianP, 2-Dec-2000)
+     */
+    pcp->driDrawablePriv = pcp->driReadablePriv = NULL;
+
+    return GL_TRUE;
+}
+
+/**
+ * This function takes both a read buffer and a draw buffer.  This is needed
+ * for \c glXMakeCurrentReadSGI or GLX 1.3's \c glXMakeContextCurrent
+ * function.
+ */
+static int driBindContext(__DRIcontext *pcp,
+			  __DRIdrawable *pdp,
+			  __DRIdrawable *prp)
+{
+    __DRIscreen *psp = NULL;
+
+    /*
+    ** Assume error checking is done properly in glXMakeCurrent before
+    ** calling driUnbindContext.
+    */
+
+    if (!pcp)
+	return GL_FALSE;
+
+    /* Bind the drawable to the context */
+    psp = pcp->driScreenPriv;
+    pcp->driDrawablePriv = pdp;
+    pcp->driReadablePriv = prp;
+    if (pdp) {
+	pdp->driContextPriv = pcp;
+	dri_get_drawable(pdp);
+    }
+    if (prp && pdp != prp) {
+	dri_get_drawable(prp);
+    }
+
+    /*
+    ** Now that we have a context associated with this drawable, we can
+    ** initialize the drawable information if has not been done before.
+    */
+
+    if (!psp->dri2.enabled) {
+	if (pdp && !pdp->pStamp) {
+	    DRM_SPINLOCK(&psp->pSAREA->drawable_lock, psp->drawLockID);
+	    __driUtilUpdateDrawableInfo(pdp);
+	    DRM_SPINUNLOCK(&psp->pSAREA->drawable_lock, psp->drawLockID);
+	}
+	if (prp && pdp != prp && !prp->pStamp) {
+	    DRM_SPINLOCK(&psp->pSAREA->drawable_lock, psp->drawLockID);
+	    __driUtilUpdateDrawableInfo(prp);
+	    DRM_SPINUNLOCK(&psp->pSAREA->drawable_lock, psp->drawLockID);
+        }
+    }
+
+    /* Call device-specific MakeCurrent */
+    return (*psp->DriverAPI.MakeCurrent)(pcp, pdp, prp);
+}
+
+/*@}*/
+
+
+/*****************************************************************/
+/** \name Drawable handling functions                            */
+/*****************************************************************/
+/*@{*/
+
+/**
+ * Update private drawable information.
+ *
+ * \param pdp pointer to the private drawable information to update.
+ * 
+ * This function basically updates the __DRIdrawable struct's
+ * cliprect information by calling \c __DRIinterfaceMethods::getDrawableInfo.
+ * This is usually called by the DRI_VALIDATE_DRAWABLE_INFO macro which
+ * compares the __DRIdrwablePrivate pStamp and lastStamp values.  If
+ * the values are different that means we have to update the clipping
+ * info.
+ */
+void
+__driUtilUpdateDrawableInfo(__DRIdrawable *pdp)
+{
+    __DRIscreen *psp = pdp->driScreenPriv;
+    __DRIcontext *pcp = pdp->driContextPriv;
+    
+    if (!pcp 
+	|| ((pdp != pcp->driDrawablePriv) && (pdp != pcp->driReadablePriv))) {
+	/* ERROR!!! 
+	 * ...but we must ignore it. There can be many contexts bound to a
+	 * drawable.
+	 */
+    }
+
+    if (pdp->pClipRects) {
+	free(pdp->pClipRects); 
+	pdp->pClipRects = NULL;
+    }
+
+    if (pdp->pBackClipRects) {
+	free(pdp->pBackClipRects); 
+	pdp->pBackClipRects = NULL;
+    }
+
+    DRM_SPINUNLOCK(&psp->pSAREA->drawable_lock, psp->drawLockID);
+
+    if (! (*psp->getDrawableInfo->getDrawableInfo)(pdp,
+			  &pdp->index, &pdp->lastStamp,
+			  &pdp->x, &pdp->y, &pdp->w, &pdp->h,
+			  &pdp->numClipRects, &pdp->pClipRects,
+			  &pdp->backX,
+			  &pdp->backY,
+			  &pdp->numBackClipRects,
+			  &pdp->pBackClipRects,
+			  pdp->loaderPrivate)) {
+	/* Error -- eg the window may have been destroyed.  Keep going
+	 * with no cliprects.
+	 */
+        pdp->pStamp = &pdp->lastStamp; /* prevent endless loop */
+	pdp->numClipRects = 0;
+	pdp->pClipRects = NULL;
+	pdp->numBackClipRects = 0;
+	pdp->pBackClipRects = NULL;
+    }
+    else
+       pdp->pStamp = &(psp->pSAREA->drawableTable[pdp->index].stamp);
+
+    DRM_SPINLOCK(&psp->pSAREA->drawable_lock, psp->drawLockID);
+}
+
+/*@}*/
+
+/*****************************************************************/
+/** \name GLX callbacks                                          */
+/*****************************************************************/
+/*@{*/
+
+static void driReportDamage(__DRIdrawable *pdp,
+			    struct drm_clip_rect *pClipRects, int numClipRects)
+{
+    __DRIscreen *psp = pdp->driScreenPriv;
+
+    /* Check that we actually have the new damage report method */
+    if (psp->damage) {
+	/* Report the damage.  Currently, all our drivers draw
+	 * directly to the front buffer, so we report the damage there
+	 * rather than to the backing storein (if any).
+	 */
+	(*psp->damage->reportDamage)(pdp,
+				     pdp->x, pdp->y,
+				     pClipRects, numClipRects,
+				     GL_TRUE, pdp->loaderPrivate);
+    }
+}
+
+
+/**
+ * Swap buffers.
+ *
+ * \param drawablePrivate opaque pointer to the per-drawable private info.
+ * 
+ * \internal
+ * This function calls __DRIdrawable::swapBuffers.
+ * 
+ * Is called directly from glXSwapBuffers().
+ */
+static void driSwapBuffers(__DRIdrawable *dPriv)
+{
+    __DRIscreen *psp = dPriv->driScreenPriv;
+    drm_clip_rect_t *rects;
+    int i;
+
+    psp->DriverAPI.SwapBuffers(dPriv);
+
+    if (!dPriv->numClipRects)
+        return;
+
+    rects = malloc(sizeof(*rects) * dPriv->numClipRects);
+
+    if (!rects)
+        return;
+
+    for (i = 0; i < dPriv->numClipRects; i++) {
+        rects[i].x1 = dPriv->pClipRects[i].x1 - dPriv->x;
+        rects[i].y1 = dPriv->pClipRects[i].y1 - dPriv->y;
+        rects[i].x2 = dPriv->pClipRects[i].x2 - dPriv->x;
+        rects[i].y2 = dPriv->pClipRects[i].y2 - dPriv->y;
+    }
+
+    driReportDamage(dPriv, rects, dPriv->numClipRects);
+    free(rects);
+}
+
+static int driDrawableGetMSC( __DRIscreen *sPriv, __DRIdrawable *dPriv,
+			      int64_t *msc )
+{
+    return sPriv->DriverAPI.GetDrawableMSC(sPriv, dPriv, msc);
+}
+
+
+static int driWaitForMSC(__DRIdrawable *dPriv, int64_t target_msc,
+			 int64_t divisor, int64_t remainder,
+			 int64_t * msc, int64_t * sbc)
+{
+    __DRIswapInfo  sInfo;
+    int  status;
+
+    status = dPriv->driScreenPriv->DriverAPI.WaitForMSC( dPriv, target_msc,
+                                                         divisor, remainder,
+                                                         msc );
+
+    /* GetSwapInfo() may not be provided by the driver if GLX_SGI_video_sync
+     * is supported but GLX_OML_sync_control is not.  Therefore, don't return
+     * an error value if GetSwapInfo() is not implemented.
+    */
+    if ( status == 0
+         && dPriv->driScreenPriv->DriverAPI.GetSwapInfo ) {
+        status = dPriv->driScreenPriv->DriverAPI.GetSwapInfo( dPriv, & sInfo );
+        *sbc = sInfo.swap_count;
+    }
+
+    return status;
+}
+
+
+const __DRImediaStreamCounterExtension driMediaStreamCounterExtension = {
+    { __DRI_MEDIA_STREAM_COUNTER, __DRI_MEDIA_STREAM_COUNTER_VERSION },
+    driWaitForMSC,
+    driDrawableGetMSC,
+};
+
+
+static void driCopySubBuffer(__DRIdrawable *dPriv,
+			      int x, int y, int w, int h)
+{
+    drm_clip_rect_t rect;
+
+    rect.x1 = x;
+    rect.y1 = dPriv->h - y - h;
+    rect.x2 = x + w;
+    rect.y2 = rect.y1 + h;
+    driReportDamage(dPriv, &rect, 1);
+
+    dPriv->driScreenPriv->DriverAPI.CopySubBuffer(dPriv, x, y, w, h);
+}
+
+const __DRIcopySubBufferExtension driCopySubBufferExtension = {
+    { __DRI_COPY_SUB_BUFFER, __DRI_COPY_SUB_BUFFER_VERSION },
+    driCopySubBuffer
+};
+
+static void driSetSwapInterval(__DRIdrawable *dPriv, unsigned int interval)
+{
+    dPriv->swap_interval = interval;
+}
+
+static unsigned int driGetSwapInterval(__DRIdrawable *dPriv)
+{
+    return dPriv->swap_interval;
+}
+
+const __DRIswapControlExtension driSwapControlExtension = {
+    { __DRI_SWAP_CONTROL, __DRI_SWAP_CONTROL_VERSION },
+    driSetSwapInterval,
+    driGetSwapInterval
+};
+
+
+/**
+ * This is called via __DRIscreenRec's createNewDrawable pointer.
+ */
+static __DRIdrawable *
+driCreateNewDrawable(__DRIscreen *psp, const __DRIconfig *config,
+		     drm_drawable_t hwDrawable, int renderType,
+		     const int *attrs, void *data)
+{
+    __DRIdrawable *pdp;
+
+    /* Since pbuffers are not yet supported, no drawable attributes are
+     * supported either.
+     */
+    (void) attrs;
+    (void) renderType;
+
+    pdp = malloc(sizeof *pdp);
+    if (!pdp) {
+	return NULL;
+    }
+
+    pdp->driContextPriv = NULL;
+    pdp->loaderPrivate = data;
+    pdp->hHWDrawable = hwDrawable;
+    pdp->refcount = 1;
+    pdp->pStamp = NULL;
+    pdp->lastStamp = 0;
+    pdp->index = 0;
+    pdp->x = 0;
+    pdp->y = 0;
+    pdp->w = 0;
+    pdp->h = 0;
+    pdp->numClipRects = 0;
+    pdp->numBackClipRects = 0;
+    pdp->pClipRects = NULL;
+    pdp->pBackClipRects = NULL;
+    pdp->vblSeq = 0;
+    pdp->vblFlags = 0;
+
+    pdp->driScreenPriv = psp;
+
+    if (!(*psp->DriverAPI.CreateBuffer)(psp, pdp, &config->modes, 0)) {
+       free(pdp);
+       return NULL;
+    }
+
+    pdp->msc_base = 0;
+
+    /* This special default value is replaced with the configured
+     * default value when the drawable is first bound to a direct
+     * rendering context. 
+     */
+    pdp->swap_interval = (unsigned)-1;
+
+    return pdp;
+}
+
+
+static __DRIdrawable *
+dri2CreateNewDrawable(__DRIscreen *screen,
+		      const __DRIconfig *config,
+		      void *loaderPrivate)
+{
+    __DRIdrawable *pdraw;
+
+    pdraw = driCreateNewDrawable(screen, config, 0, 0, NULL, loaderPrivate);
+    if (!pdraw)
+    	return NULL;
+
+    pdraw->pClipRects = &pdraw->dri2.clipRect;
+    pdraw->pBackClipRects = &pdraw->dri2.clipRect;
+
+    pdraw->pStamp = &pdraw->dri2.stamp;
+    *pdraw->pStamp = pdraw->lastStamp + 1;
+
+    return pdraw;
+}
+
+static __DRIbuffer *
+dri2AllocateBuffer(__DRIscreen *screen,
+		   unsigned int attachment, unsigned int format,
+		   int width, int height)
+{
+    return (*screen->DriverAPI.AllocateBuffer)(screen, attachment, format,
+					       width, height);
+}
+
+static void
+dri2ReleaseBuffer(__DRIscreen *screen, __DRIbuffer *buffer)
+{
+   (*screen->DriverAPI.ReleaseBuffer)(screen, buffer);
+}
+
+
+static int
+dri2ConfigQueryb(__DRIscreen *screen, const char *var, GLboolean *val)
+{
+   if (!driCheckOption(&screen->optionCache, var, DRI_BOOL))
+      return -1;
+
+   *val = driQueryOptionb(&screen->optionCache, var);
+
+   return 0;
+}
+
+static int
+dri2ConfigQueryi(__DRIscreen *screen, const char *var, GLint *val)
+{
+   if (!driCheckOption(&screen->optionCache, var, DRI_INT) &&
+       !driCheckOption(&screen->optionCache, var, DRI_ENUM))
+      return -1;
+
+    *val = driQueryOptioni(&screen->optionCache, var);
+
+    return 0;
+}
+
+static int
+dri2ConfigQueryf(__DRIscreen *screen, const char *var, GLfloat *val)
+{
+   if (!driCheckOption(&screen->optionCache, var, DRI_FLOAT))
+      return -1;
+
+    *val = driQueryOptionf(&screen->optionCache, var);
+
+    return 0;
+}
+
+
+static void dri_get_drawable(__DRIdrawable *pdp)
+{
+    pdp->refcount++;
+}
+	
+static void dri_put_drawable(__DRIdrawable *pdp)
+{
+    __DRIscreen *psp;
+
+    if (pdp) {
+	pdp->refcount--;
+	if (pdp->refcount)
+	    return;
+
+	psp = pdp->driScreenPriv;
+        (*psp->DriverAPI.DestroyBuffer)(pdp);
+	if (pdp->pClipRects && pdp->pClipRects != &pdp->dri2.clipRect) {
+	    free(pdp->pClipRects);
+	    pdp->pClipRects = NULL;
+	}
+	if (pdp->pBackClipRects && pdp->pClipRects != &pdp->dri2.clipRect) {
+	    free(pdp->pBackClipRects);
+	    pdp->pBackClipRects = NULL;
+	}
+	free(pdp);
+    }
+}
+
+static void
+driDestroyDrawable(__DRIdrawable *pdp)
+{
+    dri_put_drawable(pdp);
+}
+
+/*@}*/
+
+
+/*****************************************************************/
+/** \name Context handling functions                             */
+/*****************************************************************/
+/*@{*/
+
+/**
+ * Destroy the per-context private information.
+ * 
+ * \internal
+ * This function calls __DriverAPIRec::DestroyContext on \p contextPrivate, calls
+ * drmDestroyContext(), and finally frees \p contextPrivate.
+ */
+static void
+driDestroyContext(__DRIcontext *pcp)
+{
+    if (pcp) {
+	(*pcp->driScreenPriv->DriverAPI.DestroyContext)(pcp);
+	free(pcp);
+    }
+}
+
+
+/**
+ * Create the per-drawable private driver information.
+ * 
+ * \param render_type   Type of rendering target.  \c GLX_RGBA_TYPE is the only
+ *                      type likely to ever be supported for direct-rendering.
+ *                      However, \c GLX_RGBA_FLOAT_TYPE_ARB may eventually be
+ *                      supported by some drivers.
+ * \param shared        Context with which to share textures, etc. or NULL
+ *
+ * \returns An opaque pointer to the per-context private information on
+ *          success, or \c NULL on failure.
+ * 
+ * \internal
+ * This function allocates and fills a __DRIcontextRec structure.  It
+ * performs some device independent initialization and passes all the
+ * relevent information to __DriverAPIRec::CreateContext to create the
+ * context.
+ *
+ */
+static __DRIcontext *
+driCreateNewContext(__DRIscreen *psp, const __DRIconfig *config,
+		    int render_type, __DRIcontext *shared, 
+		    drm_context_t hwContext, void *data)
+{
+    __DRIcontext *pcp;
+    void * const shareCtx = (shared != NULL) ? shared->driverPrivate : NULL;
+
+    (void) render_type;
+
+    pcp = malloc(sizeof *pcp);
+    if (!pcp)
+	return NULL;
+
+    pcp->driScreenPriv = psp;
+    pcp->driDrawablePriv = NULL;
+    pcp->loaderPrivate = data;
+    
+    pcp->dri2.draw_stamp = 0;
+    pcp->dri2.read_stamp = 0;
+
+    pcp->hHWContext = hwContext;
+
+    if ( !(*psp->DriverAPI.CreateContext)(API_OPENGL,
+					  &config->modes, pcp, shareCtx) ) {
+        free(pcp);
+        return NULL;
+    }
+
+    return pcp;
+}
+
+static unsigned int
+dri2GetAPIMask(__DRIscreen *screen)
+{
+    return screen->api_mask;
+}
+
+static __DRIcontext *
+dri2CreateNewContextForAPI(__DRIscreen *screen, int api,
+			   const __DRIconfig *config,
+			   __DRIcontext *shared, void *data)
+{
+    __DRIcontext *context;
+    const struct gl_config *modes = (config != NULL) ? &config->modes : NULL;
+    void *shareCtx = (shared != NULL) ? shared->driverPrivate : NULL;
+    gl_api mesa_api;
+
+    if (!(screen->api_mask & (1 << api)))
+	return NULL;
+
+    switch (api) {
+    case __DRI_API_OPENGL:
+	    mesa_api = API_OPENGL;
+	    break;
+    case __DRI_API_GLES:
+	    mesa_api = API_OPENGLES;
+	    break;
+    case __DRI_API_GLES2:
+	    mesa_api = API_OPENGLES2;
+	    break;
+    default:
+	    return NULL;
+    }
+
+    context = malloc(sizeof *context);
+    if (!context)
+	return NULL;
+
+    context->driScreenPriv = screen;
+    context->driDrawablePriv = NULL;
+    context->loaderPrivate = data;
+    
+    if (!(*screen->DriverAPI.CreateContext)(mesa_api, modes,
+					    context, shareCtx) ) {
+        free(context);
+        return NULL;
+    }
+
+    return context;
+}
+
+
+static __DRIcontext *
+dri2CreateNewContext(__DRIscreen *screen, const __DRIconfig *config,
+		      __DRIcontext *shared, void *data)
+{
+   return dri2CreateNewContextForAPI(screen, __DRI_API_OPENGL,
+				     config, shared, data);
+}
+
+static int
+driCopyContext(__DRIcontext *dest, __DRIcontext *src, unsigned long mask)
+{
+    (void) dest;
+    (void) src;
+    (void) mask;
+    return GL_FALSE;
+}
+
+/*@}*/
+
+
+/*****************************************************************/
+/** \name Screen handling functions                              */
+/*****************************************************************/
+/*@{*/
+
+/**
+ * Destroy the per-screen private information.
+ * 
+ * \internal
+ * This function calls __DriverAPIRec::DestroyScreen on \p screenPrivate, calls
+ * drmClose(), and finally frees \p screenPrivate.
+ */
+static void driDestroyScreen(__DRIscreen *psp)
+{
+    if (psp) {
+	/* No interaction with the X-server is possible at this point.  This
+	 * routine is called after XCloseDisplay, so there is no protocol
+	 * stream open to the X-server anymore.
+	 */
+
+       _mesa_destroy_shader_compiler();
+
+	if (psp->DriverAPI.DestroyScreen)
+	    (*psp->DriverAPI.DestroyScreen)(psp);
+
+	if (!psp->dri2.enabled) {
+	   (void)drmUnmap((drmAddress)psp->pSAREA, SAREA_MAX);
+	   (void)drmUnmap((drmAddress)psp->pFB, psp->fbSize);
+	   (void)drmCloseOnce(psp->fd);
+	} else {
+	   driDestroyOptionCache(&psp->optionCache);
+	   driDestroyOptionInfo(&psp->optionInfo);
+	}
+
+	free(psp);
+    }
+}
+
+static void
+setupLoaderExtensions(__DRIscreen *psp,
+		      const __DRIextension **extensions)
+{
+    int i;
+
+    for (i = 0; extensions[i]; i++) {
+	if (strcmp(extensions[i]->name, __DRI_GET_DRAWABLE_INFO) == 0)
+	    psp->getDrawableInfo = (__DRIgetDrawableInfoExtension *) extensions[i];
+	if (strcmp(extensions[i]->name, __DRI_DAMAGE) == 0)
+	    psp->damage = (__DRIdamageExtension *) extensions[i];
+	if (strcmp(extensions[i]->name, __DRI_SYSTEM_TIME) == 0)
+	    psp->systemTime = (__DRIsystemTimeExtension *) extensions[i];
+	if (strcmp(extensions[i]->name, __DRI_DRI2_LOADER) == 0)
+	    psp->dri2.loader = (__DRIdri2LoaderExtension *) extensions[i];
+	if (strcmp(extensions[i]->name, __DRI_IMAGE_LOOKUP) == 0)
+	    psp->dri2.image = (__DRIimageLookupExtension *) extensions[i];
+	if (strcmp(extensions[i]->name, __DRI_USE_INVALIDATE) == 0)
+	    psp->dri2.useInvalidate = (__DRIuseInvalidateExtension *) extensions[i];
+    }
+}
+
+/**
+ * This is the bootstrap function for the driver.  libGL supplies all of the
+ * requisite information about the system, and the driver initializes itself.
+ * This routine also fills in the linked list pointed to by \c driver_modes
+ * with the \c struct gl_config that the driver can support for windows or
+ * pbuffers.
+ *
+ * For legacy DRI.
+ * 
+ * \param scrn  Index of the screen
+ * \param ddx_version Version of the 2D DDX.  This may not be meaningful for
+ *                    all drivers.
+ * \param dri_version Version of the "server-side" DRI.
+ * \param drm_version Version of the kernel DRM.
+ * \param frame_buffer Data describing the location and layout of the
+ *                     framebuffer.
+ * \param pSAREA       Pointer to the SAREA.
+ * \param fd           Device handle for the DRM.
+ * \param extensions   ??
+ * \param driver_modes  Returns modes suppoted by the driver
+ * \param loaderPrivate  ??
+ * 
+ * \note There is no need to check the minimum API version in this
+ * function.  Since the name of this function is versioned, it is
+ * impossible for a loader that is too old to even load this driver.
+ */
+static __DRIscreen *
+driCreateNewScreen(int scrn,
+		   const __DRIversion *ddx_version,
+		   const __DRIversion *dri_version,
+		   const __DRIversion *drm_version,
+		   const __DRIframebuffer *frame_buffer,
+		   drmAddress pSAREA, int fd, 
+		   const __DRIextension **extensions,
+		   const __DRIconfig ***driver_modes,
+		   void *loaderPrivate)
+{
+    static const __DRIextension *emptyExtensionList[] = { NULL };
+    __DRIscreen *psp;
+
+    (void) loaderPrivate;
+
+    if (driDriverAPI.InitScreen == NULL)
+	return NULL;
+
+    psp = calloc(1, sizeof *psp);
+    if (!psp)
+	return NULL;
+
+    setupLoaderExtensions(psp, extensions);
+
+    /*
+    ** NOT_DONE: This is used by the X server to detect when the client
+    ** has died while holding the drawable lock.  The client sets the
+    ** drawable lock to this value.
+    */
+    psp->drawLockID = 1;
+
+    psp->drm_version = *drm_version;
+    psp->ddx_version = *ddx_version;
+    psp->dri_version = *dri_version;
+
+    psp->pSAREA = pSAREA;
+    psp->lock = (drmLock *) &psp->pSAREA->lock;
+
+    psp->pFB = frame_buffer->base;
+    psp->fbSize = frame_buffer->size;
+    psp->fbStride = frame_buffer->stride;
+    psp->fbWidth = frame_buffer->width;
+    psp->fbHeight = frame_buffer->height;
+    psp->devPrivSize = frame_buffer->dev_priv_size;
+    psp->pDevPriv = frame_buffer->dev_priv;
+    psp->fbBPP = psp->fbStride * 8 / frame_buffer->width;
+
+    psp->extensions = emptyExtensionList;
+    psp->fd = fd;
+    psp->myNum = scrn;
+    psp->dri2.enabled = GL_FALSE;
+
+    psp->DriverAPI = driDriverAPI;
+    psp->api_mask = (1 << __DRI_API_OPENGL);
+
+    *driver_modes = driDriverAPI.InitScreen(psp);
+    if (*driver_modes == NULL) {
+	free(psp);
+	return NULL;
+    }
+
+    return psp;
+}
+
+/**
+ * DRI2
+ */
+static __DRIscreen *
+dri2CreateNewScreen(int scrn, int fd,
+		    const __DRIextension **extensions,
+		    const __DRIconfig ***driver_configs, void *data)
+{
+    static const __DRIextension *emptyExtensionList[] = { NULL };
+    __DRIscreen *psp;
+    drmVersionPtr version;
+
+    if (driDriverAPI.InitScreen2 == NULL)
+        return NULL;
+
+    psp = calloc(1, sizeof(*psp));
+    if (!psp)
+	return NULL;
+
+    setupLoaderExtensions(psp, extensions);
+
+    version = drmGetVersion(fd);
+    if (version) {
+	psp->drm_version.major = version->version_major;
+	psp->drm_version.minor = version->version_minor;
+	psp->drm_version.patch = version->version_patchlevel;
+	drmFreeVersion(version);
+    }
+
+    psp->extensions = emptyExtensionList;
+    psp->fd = fd;
+    psp->myNum = scrn;
+    psp->dri2.enabled = GL_TRUE;
+
+    psp->DriverAPI = driDriverAPI;
+    psp->api_mask = (1 << __DRI_API_OPENGL);
+    *driver_configs = driDriverAPI.InitScreen2(psp);
+    if (*driver_configs == NULL) {
+	free(psp);
+	return NULL;
+    }
+
+    psp->DriverAPI = driDriverAPI;
+    psp->loaderPrivate = data;
+
+    driParseOptionInfo(&psp->optionInfo, __dri2ConfigOptions,
+		       __dri2NConfigOptions);
+    driParseConfigFiles(&psp->optionCache, &psp->optionInfo, psp->myNum,
+			"dri2");
+
+    return psp;
+}
+
+static const __DRIextension **driGetExtensions(__DRIscreen *psp)
+{
+    return psp->extensions;
+}
+
+/** Core interface */
+const __DRIcoreExtension driCoreExtension = {
+    { __DRI_CORE, __DRI_CORE_VERSION },
+    NULL,
+    driDestroyScreen,
+    driGetExtensions,
+    driGetConfigAttrib,
+    driIndexConfigAttrib,
+    NULL,
+    driDestroyDrawable,
+    driSwapBuffers,
+    NULL,
+    driCopyContext,
+    driDestroyContext,
+    driBindContext,
+    driUnbindContext
+};
+
+/** Legacy DRI interface */
+const __DRIlegacyExtension driLegacyExtension = {
+    { __DRI_LEGACY, __DRI_LEGACY_VERSION },
+    driCreateNewScreen,
+    driCreateNewDrawable,
+    driCreateNewContext,
+};
+
+/** DRI2 interface */
+const __DRIdri2Extension driDRI2Extension = {
+    { __DRI_DRI2, __DRI_DRI2_VERSION },
+    dri2CreateNewScreen,
+    dri2CreateNewDrawable,
+    dri2CreateNewContext,
+    dri2GetAPIMask,
+    dri2CreateNewContextForAPI,
+    dri2AllocateBuffer,
+    dri2ReleaseBuffer
+};
+
+const __DRI2configQueryExtension dri2ConfigQueryExtension = {
+   { __DRI2_CONFIG_QUERY, __DRI2_CONFIG_QUERY_VERSION },
+   dri2ConfigQueryb,
+   dri2ConfigQueryi,
+   dri2ConfigQueryf,
+};
+
+/**
+ * Calculate amount of swap interval used between GLX buffer swaps.
+ * 
+ * The usage value, on the range [0,max], is the fraction of total swap
+ * interval time used between GLX buffer swaps is calculated.
+ *
+ *            \f$p = t_d / (i * t_r)\f$
+ * 
+ * Where \f$t_d\f$ is the time since the last GLX buffer swap, \f$i\f$ is the
+ * swap interval (as set by \c glXSwapIntervalSGI), and \f$t_r\f$ time
+ * required for a single vertical refresh period (as returned by \c
+ * glXGetMscRateOML).
+ * 
+ * See the documentation for the GLX_MESA_swap_frame_usage extension for more
+ * details.
+ *
+ * \param   dPriv  Pointer to the private drawable structure.
+ * \return  If less than a single swap interval time period was required
+ *          between GLX buffer swaps, a number greater than 0 and less than
+ *          1.0 is returned.  If exactly one swap interval time period is
+ *          required, 1.0 is returned, and if more than one is required then
+ *          a number greater than 1.0 will be returned.
+ *
+ * \sa glXSwapIntervalSGI glXGetMscRateOML
+ * 
+ * \todo Instead of caching the \c glXGetMscRateOML function pointer, would it
+ *       be possible to cache the sync rate?
+ */
+float
+driCalculateSwapUsage( __DRIdrawable *dPriv, int64_t last_swap_ust,
+		       int64_t current_ust )
+{
+   int32_t   n;
+   int32_t   d;
+   int       interval;
+   float     usage = 1.0;
+   __DRIscreen *psp = dPriv->driScreenPriv;
+
+   if ( (*psp->systemTime->getMSCRate)(dPriv, &n, &d, dPriv->loaderPrivate) ) {
+      interval = (dPriv->swap_interval != 0) ? dPriv->swap_interval : 1;
+
+
+      /* We want to calculate
+       * (current_UST - last_swap_UST) / (interval * us_per_refresh).  We get
+       * current_UST by calling __glXGetUST.  last_swap_UST is stored in
+       * dPriv->swap_ust.  interval has already been calculated.
+       *
+       * The only tricky part is us_per_refresh.  us_per_refresh is
+       * 1000000 / MSC_rate.  We know the MSC_rate is n / d.  We can flip it
+       * around and say us_per_refresh = 1000000 * d / n.  Since this goes in
+       * the denominator of the final calculation, we calculate
+       * (interval * 1000000 * d) and move n into the numerator.
+       */
+
+      usage = (current_ust - last_swap_ust);
+      usage *= n;
+      usage /= (interval * d);
+      usage /= 1000000.0;
+   }
+   
+   return usage;
+}
+
+void
+dri2InvalidateDrawable(__DRIdrawable *drawable)
+{
+    drawable->dri2.stamp++;
+}
+
+/*@}*/