added underflow check in validate_shine_table()

diff --git a/src/mesa/main/light.c b/src/mesa/main/light.c
index 83a3095726e0d95f34a061b1c6990443d1e73bab..1eed79bc2a7df41923c64b8f30772070ea19a7d8 100644 (file)
--- a/src/mesa/main/light.c
+++ b/src/mesa/main/light.c
@@ -1,4 +1,4 @@
-/* $Id: light.c,v 1.32 2001/01/02 22:02:51 brianp Exp $ */
+/* $Id: light.c,v 1.33 2001/01/04 16:22:18 brianp Exp $ */
 
 /*
  * Mesa 3-D graphics library
@@ -1072,7 +1072,10 @@ static void validate_shine_table( GLcontext *ctx, GLuint i, GLfloat shininess )
       }
       else {
         for (i = 1 ; i < SHINE_TABLE_SIZE ; i++) {
-           GLdouble t = pow(i / (GLfloat)(SHINE_TABLE_SIZE-1), shininess);
+            GLdouble t, x = i / (GLfloat) (SHINE_TABLE_SIZE - 1);
+            if (x < 0.005) /* underflow check */
+               x = 0.005;
+            t = pow(x, shininess);
            if (t > 1e-20)
               m[i] = t;
            else