mga_xmesa.c

Mesa is an open-source implementation of the OpenGL specification - a system for rendering interacti

         for ( i = 0 ; i < mmesa->nr_heaps ; i++ ) {
	    driDestroyTextureHeap( mmesa->texture_heaps[ i ] );
	    mmesa->texture_heaps[ i ] = NULL;
         }

	 assert( is_empty_list( & mmesa->swapped ) );
      }

      /* free the option cache */
      driDestroyOptionCache (&mmesa->optionCache);

      FREE(mmesa);
   }

   if (MGA_DEBUG&DEBUG_VERBOSE_DRI)
      fprintf( stderr, "[%s:%d] mgaDestroyContext done\n",
	       __FILE__, __LINE__ );
}


static GLboolean
mgaCreateBuffer( __DRIscreenPrivate *driScrnPriv,
                 __DRIdrawablePrivate *driDrawPriv,
                 const __GLcontextModes *mesaVis,
                 GLboolean isPixmap )
{
   mgaScreenPrivate *screen = (mgaScreenPrivate *) driScrnPriv->private;

   if (isPixmap) {
      return GL_FALSE; /* not implemented */
   }
   else {
      GLboolean swStencil = (mesaVis->stencilBits > 0 && 
			     mesaVis->depthBits != 24);

#if 0
      driDrawPriv->driverPrivate = (void *) 
         _mesa_create_framebuffer(mesaVis,
                                  GL_FALSE,  /* software depth buffer? */
                                  swStencil,
                                  mesaVis->accumRedBits > 0,
                                  mesaVis->alphaBits > 0 );
#else
      struct gl_framebuffer *fb = _mesa_create_framebuffer(mesaVis);

      {
         driRenderbuffer *frontRb
            = driNewRenderbuffer(GL_RGBA,
                                 NULL,
                                 screen->cpp,
                                 screen->frontOffset, screen->frontPitch,
                                 driDrawPriv);
         mgaSetSpanFunctions(frontRb, mesaVis);
         _mesa_add_renderbuffer(fb, BUFFER_FRONT_LEFT, &frontRb->Base);
      }

      if (mesaVis->doubleBufferMode) {
         driRenderbuffer *backRb
            = driNewRenderbuffer(GL_RGBA,
                                 NULL,
                                 screen->cpp,
                                 screen->backOffset, screen->backPitch,
                                 driDrawPriv);
         mgaSetSpanFunctions(backRb, mesaVis);
         _mesa_add_renderbuffer(fb, BUFFER_BACK_LEFT, &backRb->Base);
      }

      if (mesaVis->depthBits == 16) {
         driRenderbuffer *depthRb
            = driNewRenderbuffer(GL_DEPTH_COMPONENT16,
                                 NULL,
                                 screen->cpp,
                                 screen->depthOffset, screen->depthPitch,
                                 driDrawPriv);
         mgaSetSpanFunctions(depthRb, mesaVis);
         _mesa_add_renderbuffer(fb, BUFFER_DEPTH, &depthRb->Base);
      }
      else if (mesaVis->depthBits == 24) {
         /* XXX is this right? */
         if (mesaVis->stencilBits) {
            driRenderbuffer *depthRb
               = driNewRenderbuffer(GL_DEPTH_COMPONENT24,
                                    NULL,
                                    screen->cpp,
                                    screen->depthOffset, screen->depthPitch,
                                    driDrawPriv);
            mgaSetSpanFunctions(depthRb, mesaVis);
            _mesa_add_renderbuffer(fb, BUFFER_DEPTH, &depthRb->Base);
         }
         else {
            driRenderbuffer *depthRb
               = driNewRenderbuffer(GL_DEPTH_COMPONENT32,
                                    NULL,
                                    screen->cpp,
                                    screen->depthOffset, screen->depthPitch,
                                    driDrawPriv);
            mgaSetSpanFunctions(depthRb, mesaVis);
            _mesa_add_renderbuffer(fb, BUFFER_DEPTH, &depthRb->Base);
         }
      }
      else if (mesaVis->depthBits == 32) {
         driRenderbuffer *depthRb
            = driNewRenderbuffer(GL_DEPTH_COMPONENT32,
                                 NULL,
                                 screen->cpp,
                                 screen->depthOffset, screen->depthPitch,
                                 driDrawPriv);
         mgaSetSpanFunctions(depthRb, mesaVis);
         _mesa_add_renderbuffer(fb, BUFFER_DEPTH, &depthRb->Base);
      }

      if (mesaVis->stencilBits > 0 && !swStencil) {
         driRenderbuffer *stencilRb
            = driNewRenderbuffer(GL_STENCIL_INDEX8_EXT,
                                 NULL,
                                 screen->cpp,
                                 screen->depthOffset, screen->depthPitch,
                                 driDrawPriv);
         mgaSetSpanFunctions(stencilRb, mesaVis);
         _mesa_add_renderbuffer(fb, BUFFER_STENCIL, &stencilRb->Base);
      }

      _mesa_add_soft_renderbuffers(fb,
                                   GL_FALSE, /* color */
                                   GL_FALSE, /* depth */
                                   swStencil,
                                   mesaVis->accumRedBits > 0,
                                   GL_FALSE, /* alpha */
                                   GL_FALSE /* aux */);
      driDrawPriv->driverPrivate = (void *) fb;
#endif

      return (driDrawPriv->driverPrivate != NULL);
   }
}


static void
mgaDestroyBuffer(__DRIdrawablePrivate *driDrawPriv)
{
   _mesa_unreference_framebuffer((GLframebuffer **)(&(driDrawPriv->driverPrivate)));
}

static void
mgaSwapBuffers(__DRIdrawablePrivate *dPriv)
{
   if (dPriv->driContextPriv && dPriv->driContextPriv->driverPrivate) {
      mgaContextPtr mmesa;
      GLcontext *ctx;
      mmesa = (mgaContextPtr) dPriv->driContextPriv->driverPrivate;
      ctx = mmesa->glCtx;

      if (ctx->Visual.doubleBufferMode) {
         _mesa_notifySwapBuffers( ctx );
         mgaCopyBuffer( dPriv );
      }
   } else {
      /* XXX this shouldn't be an error but we can't handle it for now */
      _mesa_problem(NULL, "%s: drawable has no context!\n", __FUNCTION__);
   }
}

static GLboolean
mgaUnbindContext(__DRIcontextPrivate *driContextPriv)
{
   mgaContextPtr mmesa = (mgaContextPtr) driContextPriv->driverPrivate;
   if (mmesa)
      mmesa->dirty = ~0;

   return GL_TRUE;
}

/* This looks buggy to me - the 'b' variable isn't used anywhere...
 * Hmm - It seems that the drawable is already hooked in to
 * driDrawablePriv.
 *
 * But why are we doing context initialization here???
 */
static GLboolean
mgaMakeCurrent(__DRIcontextPrivate *driContextPriv,
               __DRIdrawablePrivate *driDrawPriv,
               __DRIdrawablePrivate *driReadPriv)
{
   if (driContextPriv) {
      mgaContextPtr mmesa = (mgaContextPtr) driContextPriv->driverPrivate;

      if (mmesa->driDrawable != driDrawPriv) {
	 if (driDrawPriv->swap_interval == (unsigned)-1) {
	    driDrawPriv->vblFlags = (mmesa->mgaScreen->irq == 0)
	       ? VBLANK_FLAG_NO_IRQ
	       : driGetDefaultVBlankFlags(&mmesa->optionCache);

	    driDrawableInitVBlank( driDrawPriv );
	 }

	 mmesa->driDrawable = driDrawPriv;
	 mmesa->dirty = ~0; 
	 mmesa->dirty_cliprects = (MGA_FRONT|MGA_BACK); 
      }

      mmesa->driReadable = driReadPriv;

      _mesa_make_current(mmesa->glCtx,
                         (GLframebuffer *) driDrawPriv->driverPrivate,
                         (GLframebuffer *) driReadPriv->driverPrivate);
   }
   else {
      _mesa_make_current(NULL, NULL, NULL);
   }

   return GL_TRUE;
}


void mgaGetLock( mgaContextPtr mmesa, GLuint flags )
{
   __DRIdrawablePrivate *dPriv = mmesa->driDrawable;
   drm_mga_sarea_t *sarea = mmesa->sarea;
   int me = mmesa->hHWContext;
   int i;

   drmGetLock(mmesa->driFd, mmesa->hHWContext, flags);

   DRI_VALIDATE_DRAWABLE_INFO( mmesa->driScreen, dPriv );
   if (*(dPriv->pStamp) != mmesa->lastStamp) {
      mmesa->lastStamp = *(dPriv->pStamp);
      mmesa->SetupNewInputs |= VERT_BIT_POS;
      mmesa->dirty_cliprects = (MGA_FRONT|MGA_BACK);
      mgaUpdateRects( mmesa, (MGA_FRONT|MGA_BACK) );
      driUpdateFramebufferSize(mmesa->glCtx, dPriv);
   }

   mmesa->dirty |= MGA_UPLOAD_CONTEXT | MGA_UPLOAD_CLIPRECTS;

   mmesa->sarea->dirty |= MGA_UPLOAD_CONTEXT;

   if (sarea->ctxOwner != me) {
      mmesa->dirty |= (MGA_UPLOAD_CONTEXT | MGA_UPLOAD_TEX0 |
		       MGA_UPLOAD_TEX1 | MGA_UPLOAD_PIPE);
      sarea->ctxOwner=me;
   }

   for ( i = 0 ; i < mmesa->nr_heaps ; i++ ) {
      DRI_AGE_TEXTURES( mmesa->texture_heaps[ i ] );
   }
}


/**
 * This is the driver specific part of the createNewScreen entry point.
 * 
 * \todo maybe fold this into intelInitDriver
 *
 * \return the __GLcontextModes supported by this driver
 */
static const __DRIconfig **mgaInitScreen(__DRIscreen *psp)
{
   static const __DRIversion ddx_expected = { 1, 2, 0 };
   static const __DRIversion dri_expected = { 4, 0, 0 };
   static const __DRIversion drm_expected = { 3, 0, 0 };
   MGADRIPtr dri_priv = (MGADRIPtr) psp->pDevPriv;

   if ( ! driCheckDriDdxDrmVersions2( "MGA",
				      &psp->dri_version, & dri_expected,
				      &psp->ddx_version, & ddx_expected,
				      &psp->drm_version, & drm_expected ) )
      return NULL;


   /* Calling driInitExtensions here, with a NULL context pointer,
    * does not actually enable the extensions.  It just makes sure
    * that all the dispatch offsets for all the extensions that
    * *might* be enables are known.  This is needed because the
    * dispatch offsets need to be known when _mesa_context_create is
    * called, but we can't enable the extensions until we have a
    * context pointer.
    *
    * Hello chicken.  Hello egg.  How are you two today?
    */

   driInitExtensions( NULL, card_extensions, GL_FALSE );
   driInitExtensions( NULL, g400_extensions, GL_FALSE );
   driInitExtensions(NULL, ARB_vp_extensions, GL_FALSE);
   driInitExtensions( NULL, NV_vp_extensions, GL_FALSE );

   if (!mgaInitDriver(psp))
       return NULL;

   return mgaFillInModes( psp,
			  dri_priv->cpp * 8,
			  (dri_priv->cpp == 2) ? 16 : 24,
			  (dri_priv->cpp == 2) ? 0  : 8,
			  (dri_priv->backOffset != dri_priv->depthOffset) );
}


/**
 * Get information about previous buffer swaps.
 */
static int
getSwapInfo( __DRIdrawablePrivate *dPriv, __DRIswapInfo * sInfo )
{
   mgaContextPtr  mmesa;

   if ( (dPriv == NULL) || (dPriv->driContextPriv == NULL)
	|| (dPriv->driContextPriv->driverPrivate == NULL)
	|| (sInfo == NULL) ) {
      return -1;
   }

   mmesa = (mgaContextPtr) dPriv->driContextPriv->driverPrivate;
   sInfo->swap_count = mmesa->swap_count;
   sInfo->swap_ust = mmesa->swap_ust;
   sInfo->swap_missed_count = mmesa->swap_missed_count;

   sInfo->swap_missed_usage = (sInfo->swap_missed_count != 0)
       ? driCalculateSwapUsage( dPriv, 0, mmesa->swap_missed_ust )
       : 0.0;

   return 0;
}

const struct __DriverAPIRec driDriverAPI = {
   .InitScreen      = mgaInitScreen,
   .DestroyScreen   = mgaDestroyScreen,
   .CreateContext   = mgaCreateContext,
   .DestroyContext  = mgaDestroyContext,
   .CreateBuffer    = mgaCreateBuffer,
   .DestroyBuffer   = mgaDestroyBuffer,
   .SwapBuffers     = mgaSwapBuffers,
   .MakeCurrent     = mgaMakeCurrent,
   .UnbindContext   = mgaUnbindContext,
   .GetSwapInfo     = getSwapInfo,
   .GetDrawableMSC  = driDrawableGetMSC32,
   .WaitForMSC      = driWaitForMSC32,
   .WaitForSBC      = NULL,
   .SwapBuffersMSC  = NULL
};