From 2a077500a84819d1e6ac62e84ded130aa655c5e9 Mon Sep 17 00:00:00 2001
From: Brian <brian.paul@tungstengraphics.com>
Date: Tue, 22 Jan 2008 21:11:55 -0700
Subject: Fix some issues with glDrawBuffer(GL_NONE), bug 14198

Set _ColorDrawBuffers[0] = NULL if no renderbuffers enabled.
Check that _ColorDrawBuffers[0] is non-null before dereferencing in a few places.
---
 src/mesa/swrast/s_blit.c | 3 +++
 1 file changed, 3 insertions(+)

(limited to 'src/mesa/swrast/s_blit.c')

diff --git a/src/mesa/swrast/s_blit.c b/src/mesa/swrast/s_blit.c
index a2c40bd9a6..af4350990c 100644
--- a/src/mesa/swrast/s_blit.c
+++ b/src/mesa/swrast/s_blit.c
@@ -745,6 +745,9 @@ _swrast_BlitFramebuffer(GLcontext *ctx,
    };
    GLint i;
 
+   if (!ctx->DrawBuffer->_NumColorDrawBuffers)
+      return;
+
    if (!clip_blit(ctx, &srcX0, &srcY0, &srcX1, &srcY1,
                   &dstX0, &dstY0, &dstX1, &dstY1)) {
       return;
-- 
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