intel: avoid unnecessary front buffer flushing/updating

Before, if we just called glXMakeCurrent() and didn't render anything we'd
still trigger a flushFrontBuffer() call.

Now only set the intel->front_buffer_dirty field at state validation time
just before we draw something.

NOTE: additional calls to intel_check_front_buffer_rendering() might be
needed if I missed some rendering paths.

1 files changed, 2 insertions, 0 deletions

diff --git a/src/mesa/drivers/dri/intel/intel_buffers.h b/src/mesa/drivers/dri/intel/intel_buffers.h
index 6069d38e9e..d7800f2ca2 100644
--- a/src/mesa/drivers/dri/intel/intel_buffers.h
+++ b/src/mesa/drivers/dri/intel/intel_buffers.h
@@ -45,6 +45,8 @@ extern struct intel_region *intel_readbuf_region(struct intel_context *intel);
 
 extern struct intel_region *intel_drawbuf_region(struct intel_context *intel);
 
+extern void intel_check_front_buffer_rendering(struct intel_context *intel);
+
 extern void intel_draw_buffer(GLcontext * ctx, struct gl_framebuffer *fb);
 
 extern void intelInitBufferFuncs(struct dd_function_table *functions);