intel_buffers.c

mesa-6.5-minigui源码

   }
   UNLOCK_HARDWARE(intel);
}



/**
 * Called by ctx->Driver.Clear.
 */
static void intelClear(GLcontext *ctx, 
		       GLbitfield mask, 
		       GLboolean all,
		       GLint cx, GLint cy, 
		       GLint cw, GLint ch)
{
   struct intel_context *intel = intel_context( ctx );
   const GLuint colorMask = *((GLuint *) &ctx->Color.ColorMask);
   GLbitfield tri_mask = 0;
   GLbitfield blit_mask = 0;
   GLbitfield swrast_mask = 0;
   GLuint i;

   if (0)
      fprintf(stderr, "%s\n", __FUNCTION__);

   /* HW color buffers (front, back, aux, generic FBO, etc) */
   if (colorMask == ~0) {
      /* clear all R,G,B,A */
      /* XXX FBO: need to check if colorbuffers are software RBOs! */
      blit_mask |= (mask & BUFFER_BITS_COLOR);
   }
   else {
      /* glColorMask in effect */
      tri_mask |= (mask & BUFFER_BITS_COLOR);
   }

   /* HW stencil */
   if (mask & BUFFER_BIT_STENCIL) {
      const struct intel_region *stencilRegion
         = intel_get_rb_region(ctx->DrawBuffer, BUFFER_STENCIL);
      if (stencilRegion) {
         /* have hw stencil */
         if ((ctx->Stencil.WriteMask[0] & 0xff) != 0xff) {
            /* not clearing all stencil bits, so use triangle clearing */
            tri_mask |= BUFFER_BIT_STENCIL;
         } 
         else {
            /* clearing all stencil bits, use blitting */
            blit_mask |= BUFFER_BIT_STENCIL;
         }
      }
   }

   /* HW depth */
   if (mask & BUFFER_BIT_DEPTH) {
      /* clear depth with whatever method is used for stencil (see above) */
      if (tri_mask & BUFFER_BIT_STENCIL)
	 tri_mask |= BUFFER_BIT_DEPTH;
      else 
	 blit_mask |= BUFFER_BIT_DEPTH;
   }

   /* SW fallback clearing */
   swrast_mask = mask & ~tri_mask & ~blit_mask;

   for (i = 0; i < BUFFER_COUNT; i++) {
      GLuint bufBit = 1 << i;
      if ((blit_mask | tri_mask) & bufBit) {
         if (!ctx->DrawBuffer->Attachment[i].Renderbuffer->ClassID) {
            blit_mask &= ~bufBit;
            tri_mask &= ~bufBit;
            swrast_mask |= bufBit;
         }
      }
   }


   intelFlush( ctx ); /* XXX intelClearWithBlit also does this */

   if (blit_mask)
      intelClearWithBlit( ctx, blit_mask, all, cx, cy, cw, ch );

   if (tri_mask) 
      intelClearWithTris( intel, tri_mask, all, cx, cy, cw, ch);

   if (swrast_mask)
      _swrast_Clear( ctx, swrast_mask, all, cx, cy, cw, ch );
}



/* Flip the front & back buffers
 */
static void intelPageFlip( const __DRIdrawablePrivate *dPriv )
{
#if 0
   struct intel_context *intel;
   int tmp, ret;

   if (INTEL_DEBUG & DEBUG_IOCTL)
      fprintf(stderr, "%s\n", __FUNCTION__);

   assert(dPriv);
   assert(dPriv->driContextPriv);
   assert(dPriv->driContextPriv->driverPrivate);

   intel = (struct intel_context *) dPriv->driContextPriv->driverPrivate;

   intelFlush( &intel->ctx );
   LOCK_HARDWARE( intel );

   if (dPriv->pClipRects) {
      *(drm_clip_rect_t *)intel->sarea->boxes = dPriv->pClipRects[0];
      intel->sarea->nbox = 1;
   }

   ret = drmCommandNone(intel->driFd, DRM_I830_FLIP); 
   if (ret) {
      fprintf(stderr, "%s: %d\n", __FUNCTION__, ret);
      UNLOCK_HARDWARE( intel );
      exit(1);
   }

   tmp = intel->sarea->last_enqueue;
   intelRefillBatchLocked( intel );
   UNLOCK_HARDWARE( intel );


   intelSetDrawBuffer( &intel->ctx, intel->ctx.Color.DriverDrawBuffer );
#endif
}


void intelSwapBuffers( __DRIdrawablePrivate *dPriv )
{
   if (dPriv->driverPrivate) {
      const struct gl_framebuffer *fb
         = (struct gl_framebuffer *) dPriv->driverPrivate;
      if (fb->Visual.doubleBufferMode) {
         GET_CURRENT_CONTEXT(ctx);
         if (ctx && ctx->DrawBuffer == fb) {
            _mesa_notifySwapBuffers( ctx );  /* flush pending rendering */
         }
	 if ( 0 /*intel->doPageFlip*/ ) { /* doPageFlip is never set !!! */
	    intelPageFlip( dPriv );
	 } else {
	    intelCopyBuffer( dPriv );
	 }
      }
   }
   else {
      _mesa_problem(NULL,
                    "dPriv has no gl_framebuffer pointer in intelSwapBuffers");
   }
}


/**
 * Update the hardware state for drawing into a window or framebuffer object.
 *
 * Called by glDrawBuffer, glBindFramebufferEXT, MakeCurrent, and other
 * places within the driver.
 *
 * Basically, this needs to be called any time the current framebuffer
 * changes, the renderbuffers change, or we need to draw into different
 * color buffers.
 */
void
intel_draw_buffer(GLcontext *ctx, struct gl_framebuffer *fb)
{
   struct intel_context *intel = intel_context(ctx);
   struct intel_region *colorRegion, *depthRegion = NULL;
   struct intel_renderbuffer *irbDepth = NULL, *irbStencil = NULL;
   int front = 0; /* drawing to front color buffer? */
 
   if (!fb) {
      /* this can happen during the initial context initialization */
      return;
   }

   /* Do this here, note core Mesa, since this function is called from
    * many places within the driver.
    */
   if (ctx->NewState & (_NEW_BUFFERS | _NEW_COLOR | _NEW_PIXEL)) {
      /* this updates the DrawBuffer->_NumColorDrawBuffers fields, etc */
      _mesa_update_framebuffer(ctx);
      /* this updates the DrawBuffer's Width/Height if it's a FBO */
      _mesa_update_draw_buffer_bounds(ctx);
   }

   if (fb->_Status != GL_FRAMEBUFFER_COMPLETE_EXT) {
      /* this may occur when we're called by glBindFrameBuffer() during
       * the process of someone setting up renderbuffers, etc.
       */
      _mesa_debug(ctx, "DrawBuffer: incomplete user FBO\n");
      return;
   }

   if (fb->Name)
      intel_validate_paired_depth_stencil(ctx, fb);

   /*
    * How many color buffers are we drawing into?
    */
   if (fb->_NumColorDrawBuffers[0] != 1
#if 0
       /* XXX FBO temporary - always use software rendering */
       || 1
#endif
    ) {
      /* writing to 0 or 2 or 4 color buffers */
      /*_mesa_debug(ctx, "Software rendering\n");*/
      FALLBACK( intel, INTEL_FALLBACK_DRAW_BUFFER, GL_TRUE );
      front = 1; /* might not have back color buffer */
   }
   else {
      /* draw to exactly one color buffer */
      /*_mesa_debug(ctx, "Hardware rendering\n");*/
      FALLBACK( intel, INTEL_FALLBACK_DRAW_BUFFER, GL_FALSE );
      if (fb->_ColorDrawBufferMask[0] == BUFFER_BIT_FRONT_LEFT) {
         front = 1;
      }
   }

   /*
    * Get the intel_renderbuffer for the colorbuffer we're drawing into.
    * And set up cliprects.
    */
   if (fb->Name == 0) {
      /* drawing to window system buffer */
      if (intel->sarea->pf_current_page == 1 ) {
         /* page flipped back/front */
         front ^= 1;
      }
      if (front) {
         intelSetFrontClipRects( intel );
         colorRegion = intel_get_rb_region(fb, BUFFER_FRONT_LEFT);
      }
      else {
         intelSetBackClipRects( intel );
         colorRegion = intel_get_rb_region(fb, BUFFER_BACK_LEFT);
      }
   }
   else {
      /* drawing to user-created FBO */
      struct intel_renderbuffer *irb;
      intelSetRenderbufferClipRects(intel);
      irb = intel_renderbuffer(fb->_ColorDrawBuffers[0][0]);
      colorRegion = (irb && irb->region) ? irb->region : NULL;
   }

   if (!colorRegion) {
      FALLBACK( intel, INTEL_FALLBACK_DRAW_BUFFER, GL_TRUE );
   }
   else {
      FALLBACK( intel, INTEL_FALLBACK_DRAW_BUFFER, GL_FALSE );
   }

   /***
    *** Get depth buffer region and check if we need a software fallback.
    *** Note that the depth buffer is usually a DEPTH_STENCIL buffer.
    ***/
   if (fb->_DepthBuffer && fb->_DepthBuffer->Wrapped) {
      irbDepth = intel_renderbuffer(fb->_DepthBuffer->Wrapped);
      if (irbDepth->region) {
         FALLBACK(intel, INTEL_FALLBACK_DEPTH_BUFFER, GL_FALSE);
         depthRegion = irbDepth->region;
      }
      else {
         FALLBACK(intel, INTEL_FALLBACK_DEPTH_BUFFER, GL_TRUE);
         depthRegion = NULL;
      }
   }
   else {
      /* not using depth buffer */
      FALLBACK(intel, INTEL_FALLBACK_DEPTH_BUFFER, GL_FALSE);
      depthRegion = NULL;
   }

   /***
    *** Stencil buffer
    *** This can only be hardware accelerated if we're using a
    *** combined DEPTH_STENCIL buffer (for now anyway).
    ***/
   if (fb->_StencilBuffer && fb->_StencilBuffer->Wrapped) {
      irbStencil = intel_renderbuffer(fb->_StencilBuffer->Wrapped);
      if (irbStencil && irbStencil->region) {
         ASSERT(irbStencil->Base._ActualFormat == GL_DEPTH24_STENCIL8_EXT);
         FALLBACK(intel, INTEL_FALLBACK_STENCIL_BUFFER, GL_FALSE);
         /* need to re-compute stencil hw state */
         ctx->Driver.Enable(ctx, GL_STENCIL_TEST, ctx->Stencil.Enabled);
         if (!depthRegion)
            depthRegion = irbStencil->region;
      }
      else {
         FALLBACK(intel, INTEL_FALLBACK_STENCIL_BUFFER, GL_TRUE);
      }
   }
   else {
      /* XXX FBO: instead of FALSE, pass ctx->Stencil.Enabled ??? */
      FALLBACK(intel, INTEL_FALLBACK_STENCIL_BUFFER, GL_FALSE);
      /* need to re-compute stencil hw state */
      ctx->Driver.Enable(ctx, GL_STENCIL_TEST, ctx->Stencil.Enabled);
   }


   /**
    ** Release old regions, reference new regions
    **/
#if 0 /* XXX FBO: this seems to be redundant with i915_state_draw_region() */
   if (intel->draw_region != colorRegion) {
      intel_region_release(intel, &intel->draw_region);
      intel_region_reference(&intel->draw_region, colorRegion);
   }
   if (intel->depth_region != depthRegion) {
      intel_region_release(intel, &intel->depth_region);
      intel_region_reference(&intel->depth_region, depthRegion);
   }
#endif

   intel->vtbl.set_draw_region( intel, colorRegion, depthRegion );

   /* update viewport since it depends on window size */
   ctx->Driver.Viewport(ctx, ctx->Viewport.X, ctx->Viewport.Y,
                        ctx->Viewport.Width, ctx->Viewport.Height);

   /* Update hardware scissor */
   ctx->Driver.Scissor( ctx, ctx->Scissor.X, ctx->Scissor.Y,
                        ctx->Scissor.Width, ctx->Scissor.Height );
}


static void
intelDrawBuffer(GLcontext *ctx, GLenum mode)
{
   intel_draw_buffer(ctx, ctx->DrawBuffer);
}


static void 
intelReadBuffer( GLcontext *ctx, GLenum mode )
{
   if (ctx->ReadBuffer == ctx->DrawBuffer) {
      /* This will update FBO completeness status.
       * A framebuffer will be incomplete if the GL_READ_BUFFER setting
       * refers to a missing renderbuffer.  Calling glReadBuffer can set
       * that straight and can make the drawing buffer complete.
       */
      intel_draw_buffer(ctx, ctx->DrawBuffer);
   }
   /* Generally, functions which read pixels (glReadPixels, glCopyPixels, etc)
    * reference ctx->ReadBuffer and do appropriate state checks.
    */
}


void intelInitBufferFuncs( struct dd_function_table *functions )
{
   functions->Clear = intelClear;
   functions->GetBufferSize = intelBufferSize;
   functions->ResizeBuffers = _mesa_resize_framebuffer;
   functions->DrawBuffer = intelDrawBuffer;
   functions->ReadBuffer = intelReadBuffer;
}