On 07/10/2011 12:30 PM, Marek Olšák wrote:
 From ARB_framebuffer_object:
     If a buffer is specified in<mask>  and does not exist in both the
     read and draw framebuffers, the corresponding bit is silently
     ignored.
---
  src/mesa/main/fbobject.c |    4 ++++
  1 files changed, 4 insertions(+), 0 deletions(-)

diff --git a/src/mesa/main/fbobject.c b/src/mesa/main/fbobject.c
index d094dd3..8496936 100644
--- a/src/mesa/main/fbobject.c
+++ b/src/mesa/main/fbobject.c
@@ -2603,6 +2603,10 @@ _mesa_BlitFramebufferEXT(GLint srcX0, GLint srcY0, GLint 
srcX1, GLint srcY1,
        }
     }

+   if (!mask) {
+      return;
+   }
+
     ASSERT(ctx->Driver.BlitFramebuffer);
     ctx->Driver.BlitFramebuffer(ctx,
                                 srcX0, srcY0, srcX1, srcY1,

Reviewed-by: Brian Paul <[email protected]>
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