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added divide by zero checks

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This commit is contained in:
Brian Paul 2001-01-03 22:55:26 +00:00
parent 08dfacd425
commit d14fce03f0
1 changed files with 12 additions and 3 deletions
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15
src/mesa/swrast/s_fog.c
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@ -1,4 +1,4 @@
/* $Id: s_fog.c,v 1.7 2001/01/03 15:59:30 brianp Exp $ */
/* $Id: s_fog.c,v 1.8 2001/01/03 22:55:26 brianp Exp $ */
/*
* Mesa 3-D graphics library
@ -119,9 +119,14 @@ _mesa_win_fog_coords_from_z( const GLcontext *ctx,
const GLfloat p10 = ctx->ProjectionMatrix.m[10];
const GLfloat p14 = ctx->ProjectionMatrix.m[14];
const GLfloat tz = ctx->Viewport._WindowMap.m[MAT_TZ];
const GLfloat szInv = 1.0F / ctx->Viewport._WindowMap.m[MAT_SZ];
GLfloat szInv;
GLuint i;
if (ctx->Viewport._WindowMap.m[MAT_SZ] == 0.0)
szInv = 1.0F;
else
szInv = 1.0F / ctx->Viewport._WindowMap.m[MAT_SZ];
/*
* Note: to compute eyeZ from the ndcZ we have to solve the following:
*
@ -149,7 +154,11 @@ _mesa_win_fog_coords_from_z( const GLcontext *ctx,
case GL_LINEAR:
{
GLfloat fogEnd = ctx->Fog.End;
GLfloat fogScale = 1.0F / (ctx->Fog.End - ctx->Fog.Start);
GLfloat fogScale;
if (ctx->Fog.Start == ctx->Fog.End)
fogScale = 1.0;
else
fogScale = 1.0F / (ctx->Fog.End - ctx->Fog.Start);
if (ortho) {
for (i=0;i<n;i++) {
GLfloat ndcz = ((GLfloat) z[i] - tz) * szInv;