From 6ac852d45b3a53dc51414773454e6bae7126fe33 Mon Sep 17 00:00:00 2001
From: Brian Paul <brian.paul@tungstengraphics.com>
Date: Tue, 10 Apr 2001 15:46:51 +0000
Subject: fixed some divide by zero conformance problems

---
 src/mesa/swrast/s_aatriangle.c | 11 +++++++----
 1 file changed, 7 insertions(+), 4 deletions(-)

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

diff --git a/src/mesa/swrast/s_aatriangle.c b/src/mesa/swrast/s_aatriangle.c
index 93f65b826c..8235e957e3 100644
--- a/src/mesa/swrast/s_aatriangle.c
+++ b/src/mesa/swrast/s_aatriangle.c
@@ -1,4 +1,4 @@
-/* $Id: s_aatriangle.c,v 1.12 2001/03/29 16:50:32 brianp Exp $ */
+/* $Id: s_aatriangle.c,v 1.13 2001/04/10 15:46:51 brianp Exp $ */
 
 /*
  * Mesa 3-D graphics library
@@ -92,7 +92,7 @@ do {					\
 static INLINE GLfloat
 solve_plane(GLfloat x, GLfloat y, const GLfloat plane[4])
 {
-   GLfloat z = (plane[3] + plane[0] * x + plane[1] * y) / -plane[2];
+   const GLfloat z = (plane[3] + plane[0] * x + plane[1] * y) / -plane[2];
    return z;
 }
 
@@ -107,8 +107,11 @@ solve_plane(GLfloat x, GLfloat y, const GLfloat plane[4])
 static INLINE GLfloat
 solve_plane_recip(GLfloat x, GLfloat y, const GLfloat plane[4])
 {
-   GLfloat z = -plane[2] / (plane[3] + plane[0] * x + plane[1] * y);
-   return z;
+   const GLfloat denom = plane[3] + plane[0] * x + plane[1] * y;
+   if (denom == 0.0F)
+      return 0.0F;
+   else
+      return -plane[2] / denom;
 }
 
 
-- 
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