From: Brian Paul <brian.paul@tungstengraphics.com>
Date: Sun, 18 May 2008 21:41:36 +0000 (-0600)
Subject: added div by zero check for Fog.End/Start (from gallium-0.1)
X-Git-Url: https://git.libre-soc.org/?a=commitdiff_plain;h=5976a6a75cfa6749db306111a601d99c99cc00a4;p=mesa.git

added div by zero check for Fog.End/Start (from gallium-0.1)
---

diff --git a/src/mesa/shader/prog_statevars.c b/src/mesa/shader/prog_statevars.c
index 4ae74c1d42b..72bdad76545 100644
--- a/src/mesa/shader/prog_statevars.c
+++ b/src/mesa/shader/prog_statevars.c
@@ -253,7 +253,8 @@ _mesa_fetch_state(GLcontext *ctx, const gl_state_index state[],
       value[0] = ctx->Fog.Density;
       value[1] = ctx->Fog.Start;
       value[2] = ctx->Fog.End;
-      value[3] = 1.0F / (ctx->Fog.End - ctx->Fog.Start);
+      value[3] = (ctx->Fog.End == ctx->Fog.Start)
+         ? 1.0 : 1.0F / (ctx->Fog.End - ctx->Fog.Start);
       return;
    case STATE_CLIPPLANE:
       {