Mesa (master): mesa: handle GL_NONE draw buffers correctly in glClear

[Marek Olšák]

Module: Mesa
Branch: master
Commit: 9bf9578c1b79e5622a2325f1a2bb80fcf0e22a6d
URL:    http://cgit.freedesktop.org/mesa/mesa/commit/?id=9bf9578c1b79e5622a2325f1a2bb80fcf0e22a6d

Author: Marek Olšák <marek.olsak at amd.com>
Date:   Wed Jan  8 01:23:43 2014 +0100

mesa: handle GL_NONE draw buffers correctly in glClear

Reviewed-by: Brian Paul <brianp at vmware.com>

---

 src/mesa/main/clear.c |    6 +++++-
 1 file changed, 5 insertions(+), 1 deletion(-)

diff --git a/src/mesa/main/clear.c b/src/mesa/main/clear.c
index f0b525f..fd5bb35 100644
--- a/src/mesa/main/clear.c
+++ b/src/mesa/main/clear.c
@@ -179,7 +179,11 @@ _mesa_Clear( GLbitfield mask )
       if (mask & GL_COLOR_BUFFER_BIT) {
          GLuint i;
          for (i = 0; i < ctx->DrawBuffer->_NumColorDrawBuffers; i++) {
-            bufferMask |= (1 << ctx->DrawBuffer->_ColorDrawBufferIndexes[i]);
+            GLint buf = ctx->DrawBuffer->_ColorDrawBufferIndexes[i];
+
+            if (buf >= 0) {
+               bufferMask |= 1 << buf;
+            }
          }
       }