From b4531121330fa85a072f129d11e8432b5294c789 Mon Sep 17 00:00:00 2001
From: Michel Dänzer <michel@tungstengraphics.com>
Date: Wed, 17 Oct 2007 18:26:31 +0200
Subject: i915: Don't emit 'empty' blit rectangles.

The hardware seems to interpret them differently and produce unexpected
results...
---
 src/mesa/drivers/dri/i915/intel_blit.c | 3 +++
 1 file changed, 3 insertions(+)

(limited to 'src/mesa/drivers')

diff --git a/src/mesa/drivers/dri/i915/intel_blit.c b/src/mesa/drivers/dri/i915/intel_blit.c
index b00b0d9e1b..2d4d00edef 100644
--- a/src/mesa/drivers/dri/i915/intel_blit.c
+++ b/src/mesa/drivers/dri/i915/intel_blit.c
@@ -402,6 +402,9 @@ intelClearWithBlit(GLcontext * ctx, GLbitfield mask)
             b = *box;
          }
 
+         if (b.x1 >= b.x2 || b.y1 >= b.y2)
+            continue;
+
          if (0)
             _mesa_printf("clear %d,%d..%d,%d, mask %x\n",
                          b.x1, b.y1, b.x2, b.y2, mask);
-- 
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