From 1c768645c5449f3bb66edb198821cf4947998a68 Mon Sep 17 00:00:00 2001
From: Brian Paul <brian.paul@tungstengraphics.com>
Date: Wed, 3 Jan 2001 22:56:23 +0000
Subject: added divide by zero check

---
 src/mesa/tnl/t_vb_fog.c | 7 +++++--
 1 file changed, 5 insertions(+), 2 deletions(-)

(limited to 'src/mesa')

diff --git a/src/mesa/tnl/t_vb_fog.c b/src/mesa/tnl/t_vb_fog.c
index 38a80702ab..2adb8d1850 100644
--- a/src/mesa/tnl/t_vb_fog.c
+++ b/src/mesa/tnl/t_vb_fog.c
@@ -1,4 +1,4 @@
-/* $Id: t_vb_fog.c,v 1.1 2000/12/26 05:09:33 keithw Exp $ */
+/* $Id: t_vb_fog.c,v 1.2 2001/01/03 22:56:23 brianp Exp $ */
 
 /*
  * Mesa 3-D graphics library
@@ -68,7 +68,10 @@ static void make_win_fog_coords( GLcontext *ctx, GLvector1f *out,
 
    switch (ctx->Fog.Mode) {
    case GL_LINEAR:
-      d = 1.0F / (ctx->Fog.End - ctx->Fog.Start);
+      if (ctx->Fog.Start == ctx->Fog.End)
+         d = 1.0F;
+      else
+         d = 1.0F / (ctx->Fog.End - ctx->Fog.Start);
       for ( i = 0 ; i < n ; i++, STRIDE_F(v, stride)) 
 	 data[i] = (end - ABSF(*v)) * d;
       break;
-- 
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