mesa/st: wire up DiscardFramebuffer

Signed-off-by: Jonathan Marek <jonathan@marek.ca>
Reviewed-by: Eric Anholt <eric@anholt.net>

diff --git a/src/mesa/state_tracker/st_cb_fbo.c b/src/mesa/state_tracker/st_cb_fbo.c
index 1a63e77826fd098390b295d585109e1f3dbff5d7..3bd7fd4ad27cace950d8abc84e7869834277747c 100644 (file)
--- a/src/mesa/state_tracker/st_cb_fbo.c
+++ b/src/mesa/state_tracker/st_cb_fbo.c
@@ -762,6 +762,30 @@ st_validate_framebuffer(struct gl_context *ctx, struct gl_framebuffer *fb)
 }
 
 
+/**
+ * Called by ctx->Driver.DiscardFramebuffer
+ */
+static void
+st_discard_framebuffer(struct gl_context *ctx, struct gl_framebuffer *fb,
+                       struct gl_renderbuffer_attachment *att)
+{
+   struct st_context *st = st_context(ctx);
+   struct pipe_resource *prsc;
+
+   if (!att->Renderbuffer)
+      return;
+
+   prsc = st_renderbuffer(att->Renderbuffer)->surface->texture;
+
+   /* using invalidate_resource will only work for simple 2D resources */
+   if (prsc->depth0 != 1 || prsc->array_size != 1 || prsc->last_level != 0)
+      return;
+
+   if (st->pipe->invalidate_resource)
+      st->pipe->invalidate_resource(st->pipe, prsc);
+}
+
+
 /**
  * Called via glDrawBuffer.  We only provide this driver function so that we
  * can check if we need to allocate a new renderbuffer.  Specifically, we
@@ -939,6 +963,7 @@ st_init_fbo_functions(struct dd_function_table *functions)
    functions->RenderTexture = st_render_texture;
    functions->FinishRenderTexture = st_finish_render_texture;
    functions->ValidateFramebuffer = st_validate_framebuffer;
+   functions->DiscardFramebuffer = st_discard_framebuffer;
 
    functions->DrawBufferAllocate = st_DrawBufferAllocate;
    functions->ReadBuffer = st_ReadBuffer;