Mesa (master): mesa: return early if mask is cleared to zero in BlitFramebuffer

[Marek Olšák]

Module: Mesa
Branch: master
Commit: 83478e5d5944e1fc320e8cfb10ba75055bbea3fd
URL:    http://cgit.freedesktop.org/mesa/mesa/commit/?id=83478e5d5944e1fc320e8cfb10ba75055bbea3fd

Author: Marek Olšák <maraeo at gmail.com>
Date:   Sun Jul 10 20:01:33 2011 +0200

mesa: return early if mask is cleared to zero in BlitFramebuffer

>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,