gallium: add notify_swapbuffers_complete, use it to set surfaces to undefined state

2 files changed, 21 insertions, 0 deletions

diff --git a/src/mesa/state_tracker/st_framebuffer.c b/src/mesa/state_tracker/st_framebuffer.c
index 42e8e24896c..bca3fa5c383 100644
--- a/src/mesa/state_tracker/st_framebuffer.c
+++ b/src/mesa/state_tracker/st_framebuffer.c
@@ -177,6 +177,26 @@ st_notify_swapbuffers(struct st_framebuffer *stfb)
    }
 }
 
+
+/** 
+ * Quick hack - allows the winsys to inform the driver that surface
+ * states are now undefined after a glXSwapBuffers or similar.
+ */
+void
+st_notify_swapbuffers_complete(struct st_framebuffer *stfb)
+{
+   GET_CURRENT_CONTEXT(ctx);
+
+   if (ctx && ctx->DrawBuffer == &stfb->Base) {
+      struct st_renderbuffer *strb;
+      int i;
+
+      for (i = 0; i < BUFFER_COUNT; i++) {
+	 if (stfb->Base.Attachment[i].Renderbuffer) {
+	    strb = st_renderbuffer(stfb->Base.Attachment[i].Renderbuffer);
+	    strb->surface->status = PIPE_SURFACE_STATUS_UNDEFINED;
+	 }
+      }
    }
 }
 
diff --git a/src/mesa/state_tracker/st_public.h b/src/mesa/state_tracker/st_public.h
index 78a8fde82b5..3c397b126a9 100644
--- a/src/mesa/state_tracker/st_public.h
+++ b/src/mesa/state_tracker/st_public.h
@@ -81,5 +81,6 @@ void st_make_current(struct st_context *st,
 void st_flush( struct st_context *st, uint pipeFlushFlags );
 
 void st_notify_swapbuffers(struct st_framebuffer *stfb);
+void st_notify_swapbuffers_complete(struct st_framebuffer *stfb);
 
 #endif