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added divide by zero check

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This commit is contained in:
Brian Paul 2001-01-04 15:32:32 +00:00
parent 2fd9c8690f
commit 6517211e12
1 changed files with 9 additions and 3 deletions
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12
src/mesa/swrast/s_aalinetemp.h
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@ -1,4 +1,4 @@
/* $Id: s_aalinetemp.h,v 1.2 2000/11/19 23:10:26 brianp Exp $ */
/* $Id: s_aalinetemp.h,v 1.3 2001/01/04 15:32:32 brianp Exp $ */
/*
* Mesa 3-D graphics library
@ -166,8 +166,14 @@ NAME(line)(GLcontext *ctx, const SWvertex *v0, const SWvertex *v1)
line.dy = line.y1 - line.y0;
line.len = sqrt(line.dx * line.dx + line.dy * line.dy);
line.halfWidth = 0.5F * ctx->Line.Width;
line.xAdj = line.dx / line.len * line.halfWidth;
line.yAdj = line.dy / line.len * line.halfWidth;
if (line.len == 0.0) {
line.xAdj = 0.0;
line.yAdj = 0.0;
}
else {
line.xAdj = line.dx / line.len * line.halfWidth;
line.yAdj = line.dy / line.len * line.halfWidth;
}
#ifdef DO_Z
compute_plane(line.x0, line.y0, line.x1, line.y1,