From 86b81ef5aa14a2fa7be6e5c319c00324028a1761 Mon Sep 17 00:00:00 2001
From: =?utf8?q?Michel=20D=C3=A4nzer?= <michel@tungstengraphics.com>
Date: Wed, 17 Oct 2007 18:28:03 +0200
Subject: [PATCH] Don't call the driver clear hook when the effective scissor
 rectangle is empty.

---
 src/mesa/main/buffers.c | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/src/mesa/main/buffers.c b/src/mesa/main/buffers.c
index cbbe3e8698b..d9c18bfaafc 100644
--- a/src/mesa/main/buffers.c
+++ b/src/mesa/main/buffers.c
@@ -140,7 +140,9 @@ _mesa_Clear( GLbitfield mask )
       return;
    }
 
-   if (ctx->DrawBuffer->Width == 0 || ctx->DrawBuffer->Height == 0)
+   if (ctx->DrawBuffer->Width == 0 || ctx->DrawBuffer->Height == 0 ||
+       ctx->DrawBuffer->_Xmin >= ctx->DrawBuffer->_Xmax ||
+       ctx->DrawBuffer->_Ymin >= ctx->DrawBuffer->_Ymax)
       return;
 
    if (ctx->RenderMode == GL_RENDER) {
-- 
2.11.0