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fixed some divide by zero problems found w/ conform

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This commit is contained in:
Brian Paul 2001-05-10 17:41:41 +00:00
parent bd3d9b9d04
commit dbed202744
3 changed files with 17 additions and 13 deletions
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7
src/mesa/swrast/s_aaline.c
View file

@ -1,4 +1,4 @@
/* $Id: s_aaline.c,v 1.8 2001/04/10 15:46:51 brianp Exp $ */
/* $Id: s_aaline.c,v 1.9 2001/05/10 17:41:41 brianp Exp $ */
/*
* Mesa 3-D graphics library
@ -201,7 +201,10 @@ compute_lambda(const GLfloat sPlane[4], const GLfloat tPlane[4],
GLfloat r2 = dvdx * dvdx + dvdy * dvdy;
GLfloat rho2 = r1 + r2;
/* return log base 2 of rho */
return log(rho2) * 1.442695 * 0.5; /* 1.442695 = 1/log(2) */
if (rho2 == 0.0F)
return 0.0;
else
return log(rho2) * 1.442695 * 0.5; /* 1.442695 = 1/log(2) */
}

16
src/mesa/swrast/s_aalinetemp.h
View file

@ -1,4 +1,4 @@
/* $Id: s_aalinetemp.h,v 1.8 2001/05/03 22:13:32 brianp Exp $ */
/* $Id: s_aalinetemp.h,v 1.9 2001/05/10 17:41:41 brianp Exp $ */
/*
* Mesa 3-D graphics library
@ -166,14 +166,12 @@ 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;
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;
}
if (line.len == 0.0)
return;
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,

7
src/mesa/swrast/s_aatriangle.c
View file

@ -1,4 +1,4 @@
/* $Id: s_aatriangle.c,v 1.13 2001/04/10 15:46:51 brianp Exp $ */
/* $Id: s_aatriangle.c,v 1.14 2001/05/10 17:41:41 brianp Exp $ */
/*
* Mesa 3-D graphics library
@ -341,7 +341,10 @@ compute_lambda(const GLfloat sPlane[4], const GLfloat tPlane[4],
GLfloat r2 = dvdx * dvdx + dvdy * dvdy;
GLfloat rho2 = r1 + r2;
/* return log base 2 of rho */
return log(rho2) * 1.442695 * 0.5; /* 1.442695 = 1/log(2) */
if (rho2 == 0.0F)
return 0.0;
else
return log(rho2) * 1.442695 * 0.5; /* 1.442695 = 1/log(2) */
}