From: Michel Dänzer <michel@tungstengraphics.com>
Date: Wed, 17 Oct 2007 16:26:31 +0000 (+0200)
Subject: i915: Don't emit 'empty' blit rectangles.
X-Git-Tag: mesa-7.8~5882^2~7^2~33
X-Git-Url: http://review.tizen.org/git/?a=commitdiff_plain;h=b4531121330fa85a072f129d11e8432b5294c789;p=platform%2Fupstream%2Fmesa.git

i915: Don't emit 'empty' blit rectangles.

The hardware seems to interpret them differently and produce unexpected
results...
---

diff --git a/src/mesa/drivers/dri/i915/intel_blit.c b/src/mesa/drivers/dri/i915/intel_blit.c
index b00b0d9..2d4d00e 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);