added divide by zero checks

diff --git a/src/mesa/swrast/s_triangle.c b/src/mesa/swrast/s_triangle.c
index d268b2e754dbf7949d313d239b0ede30b3bb9e59..9f3f2fe54b14354ead2529bc5ad70c3768093d57 100644 (file)
--- a/src/mesa/swrast/s_triangle.c
+++ b/src/mesa/swrast/s_triangle.c
@@ -1,4 +1,4 @@
-/* $Id: s_triangle.c,v 1.11 2001/02/06 21:42:49 brianp Exp $ */
+/* $Id: s_triangle.c,v 1.12 2001/02/07 18:44:55 brianp Exp $ */
 
 /*
  * Mesa 3-D graphics library
@@ -1618,7 +1618,7 @@ static void general_textured_triangle( GLcontext *ctx,
           if (n>0) {                                           \
               if (flat_shade) {                                        \
                  for (i=0;i<n;i++) {                           \
-                   GLdouble invQ = 1.0 / vv;                   \
+                   GLdouble invQ = vv ? (1.0 / vv) : 1.0;      \
                    zspan[i] = FixedToDepth(ffz);               \
                    fogspan[i] = fffog / 256;                   \
                    rgba[i][RCOMP] = r;                         \
@@ -1638,7 +1638,7 @@ static void general_textured_triangle( GLcontext *ctx,
               }                                                        \
               else {                                           \
                  for (i=0;i<n;i++) {                           \
-                   GLdouble invQ = 1.0 / vv;                   \
+                   GLdouble invQ = vv ? (1.0 / vv) : 1.0;      \
                    zspan[i] = FixedToDepth(ffz);               \
                    rgba[i][RCOMP] = FixedToInt(ffr);           \
                    rgba[i][GCOMP] = FixedToInt(ffg);           \
@@ -1713,7 +1713,7 @@ static void general_textured_spec_triangle1( GLcontext *ctx,
           if (n>0) {                                           \
               if (flat_shade) {                                        \
                  for (i=0;i<n;i++) {                           \
-                   GLdouble invQ = 1.0 / vv;                   \
+                   GLdouble invQ = vv ? (1.0 / vv) : 1.0;      \
                    zspan[i] = FixedToDepth(ffz);               \
                    fogspan[i] = fffog / 256;                   \
                    rgba[i][RCOMP] = r;                         \
@@ -1736,7 +1736,7 @@ static void general_textured_spec_triangle1( GLcontext *ctx,
               }                                                        \
               else {                                           \
                  for (i=0;i<n;i++) {                           \
-                   GLdouble invQ = 1.0 / vv;                   \
+                   GLdouble invQ = vv ? (1.0 / vv) : 1.0;      \
                    zspan[i] = FixedToDepth(ffz);               \
                    fogspan[i] = fffog / 256;                   \
                    rgba[i][RCOMP] = FixedToInt(ffr);           \
@@ -1844,7 +1844,7 @@ static void lambda_textured_triangle1( GLcontext *ctx,
           if (n>0) {                                                   \
              if (flat_shade) {                                         \
                 for (i=0;i<n;i++) {                                    \
-                   GLdouble invQ = 1.0 / vv;                           \
+                   GLdouble invQ = vv ? (1.0 / vv) : 1.0;              \
                    zspan[i] = FixedToDepth(ffz);                       \
                    fogspan[i] = fffog / 256;                           \
                    rgba[i][RCOMP] = r;                                 \
@@ -1865,7 +1865,7 @@ static void lambda_textured_triangle1( GLcontext *ctx,
               }                                                                \
               else {                                                   \
                 for (i=0;i<n;i++) {                                    \
-                   GLdouble invQ = 1.0 / vv;                           \
+                   GLdouble invQ = vv ? (1.0 / vv) : 1.0;              \
                    zspan[i] = FixedToDepth(ffz);                       \
                    fogspan[i] = fffog / 256;                           \
                    rgba[i][RCOMP] = FixedToInt(ffr);                   \
@@ -1952,7 +1952,7 @@ static void lambda_textured_spec_triangle1( GLcontext *ctx,
           if (n>0) {                                                   \
              if (flat_shade) {                                         \
                 for (i=0;i<n;i++) {                                    \
-                   GLdouble invQ = 1.0 / vv;                           \
+                   GLdouble invQ = vv ? (1.0 / vv) : 1.0;              \
                    zspan[i] = FixedToDepth(ffz);                       \
                    fogspan[i] = fffog / 256;                           \
                    rgba[i][RCOMP] = r;                                 \
@@ -1976,7 +1976,7 @@ static void lambda_textured_spec_triangle1( GLcontext *ctx,
               }                                                                \
               else {                                                   \
                 for (i=0;i<n;i++) {                                    \
-                   GLdouble invQ = 1.0 / vv;                           \
+                   GLdouble invQ = vv ? (1.0 / vv) : 1.0;              \
                    zspan[i] = FixedToDepth(ffz);                       \
                    fogspan[i] = fffog / 256;                           \
                    rgba[i][RCOMP] = FixedToInt(ffr);                   \