[965] Allow draw or depth regions to be NULL.

With FBOs, we end up wanting to do 3D metaops against one or the other without
having to find the other one to fill in if we're not going to draw to it.

1 files changed, 30 insertions, 20 deletions

diff --git a/src/mesa/drivers/dri/i965/brw_wm_surface_state.c b/src/mesa/drivers/dri/i965/brw_wm_surface_state.c
index e361ab5a70..efec0e7517 100644
--- a/src/mesa/drivers/dri/i965/brw_wm_surface_state.c
+++ b/src/mesa/drivers/dri/i965/brw_wm_surface_state.c
@@ -172,7 +172,7 @@ brw_create_texture_surface( struct brw_context *brw,
    surf.ss2.height = key->height - 1;
 
    surf.ss3.tile_walk = BRW_TILEWALK_XMAJOR;
-   surf.ss3.tiled_surface = key->tiled; /* always zero */
+   surf.ss3.tiled_surface = key->tiled;
    surf.ss3.pitch = (key->pitch * key->cpp) - 1;
    surf.ss3.depth = key->depth - 1;
 
@@ -273,15 +273,31 @@ static void upload_wm_surfaces(struct brw_context *brw )
    {
       struct brw_surface_state surf;
       struct intel_region *region = brw->state.draw_region;
+      dri_bo *region_bo;
 
       memset(&surf, 0, sizeof(surf));
 
-      if (region->cpp == 4)
-	 surf.ss0.surface_format = BRW_SURFACEFORMAT_B8G8R8A8_UNORM;
-      else 
-	 surf.ss0.surface_format = BRW_SURFACEFORMAT_B5G6R5_UNORM;
+      if (region != NULL) {
+	 if (region->cpp == 4)
+	    surf.ss0.surface_format = BRW_SURFACEFORMAT_B8G8R8A8_UNORM;
+	 else
+	    surf.ss0.surface_format = BRW_SURFACEFORMAT_B5G6R5_UNORM;
+
+	 surf.ss0.surface_type = BRW_SURFACE_2D;
 
-      surf.ss0.surface_type = BRW_SURFACE_2D;
+	 surf.ss1.base_addr = region->buffer->offset; /* reloc */
+
+	 surf.ss2.width = region->pitch - 1; /* XXX: not really! */
+	 surf.ss2.height = region->height - 1;
+	 surf.ss3.tile_walk = BRW_TILEWALK_XMAJOR;
+	 surf.ss3.tiled_surface = region->tiled;
+	 surf.ss3.pitch = (region->pitch * region->cpp) - 1;
+	 region_bo = region->buffer;
+      } else {
+	 surf.ss0.surface_format = BRW_SURFACEFORMAT_B8G8R8A8_UNORM;
+	 surf.ss0.surface_type = BRW_SURFACE_NULL;
+	 region_bo = NULL;
+      }
 
       /* _NEW_COLOR */
       surf.ss0.color_blend = (!brw->attribs.Color->_LogicOpEnabled &&
@@ -293,18 +309,10 @@ static void upload_wm_surfaces(struct brw_context *brw )
       surf.ss0.writedisable_blue =  !brw->attribs.Color->ColorMask[2];
       surf.ss0.writedisable_alpha = !brw->attribs.Color->ColorMask[3];
 
-      surf.ss1.base_addr = region->buffer->offset; /* reloc */
-
-      surf.ss2.width = region->pitch - 1; /* XXX: not really! */
-      surf.ss2.height = region->height - 1;
-      surf.ss3.tile_walk = BRW_TILEWALK_XMAJOR;
-      surf.ss3.tiled_surface = region->tiled;
-      surf.ss3.pitch = (region->pitch * region->cpp) - 1;
-
       /* Key size will never match key size for textures, so we're safe. */
       dri_bo_unreference(brw->wm.surf_bo[0]);
       brw->wm.surf_bo[0] = brw_cache_data( &brw->cache, BRW_SS_SURFACE, &surf,
-					   &region->buffer, 1 );
+					   &region_bo, 1 );
 
       brw->wm.nr_surfaces = 1;
    }
@@ -343,11 +351,13 @@ static void emit_reloc_wm_surfaces(struct brw_context *brw)
    int unit, i;
 
    /* Emit SS framebuffer relocation */
-   dri_emit_reloc(brw->wm.surf_bo[0],
-		  DRM_BO_FLAG_MEM_TT | DRM_BO_FLAG_READ | DRM_BO_FLAG_WRITE,
-		  0,
-		  offsetof(struct brw_surface_state, ss1),
-		  brw->state.draw_region->buffer);
+   if (brw->state.draw_region != NULL) {
+      dri_emit_reloc(brw->wm.surf_bo[0],
+		     DRM_BO_FLAG_MEM_TT | DRM_BO_FLAG_READ | DRM_BO_FLAG_WRITE,
+		     0,
+		     offsetof(struct brw_surface_state, ss1),
+		     brw->state.draw_region->buffer);
+   }
 
    /* Emit SS relocations for texture buffers */
    for (unit = 0; unit < BRW_MAX_TEX_UNIT; unit++) {