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-rw-r--r--src/mesa/swrast/s_aalinetemp.h12
1 files changed, 9 insertions, 3 deletions
diff --git a/src/mesa/swrast/s_aalinetemp.h b/src/mesa/swrast/s_aalinetemp.h
index 71da5f0c5c..d16fe2c129 100644
--- a/src/mesa/swrast/s_aalinetemp.h
+++ b/src/mesa/swrast/s_aalinetemp.h
@@ -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,