mesa: add #define FEATURE_ARB_pixel_buffer_object

[mesa.git] / src / mesa / main / light.h

diff --git a/src/mesa/main/light.h b/src/mesa/main/light.h
index f47fe58a83932f832b9a4358d8ba3f5c1521f1cc..b97e17b5be4e5f55ad4babd3bd71b124ed47c456 100644 (file)
--- a/src/mesa/main/light.h
+++ b/src/mesa/main/light.h
@@ -92,7 +92,8 @@ do {                                                                  \
    struct gl_shine_tab *_tab = table;                                  \
    float f = (dp * (SHINE_TABLE_SIZE-1));                              \
    int k = (int) f;                                                    \
-   if (k > SHINE_TABLE_SIZE-2)                                                 \
+   if (k < 0 /* gcc may cast an overflow float value to negative int value*/ \
+       || k > SHINE_TABLE_SIZE-2)                                      \
       result = (GLfloat) _mesa_pow( dp, _tab->shininess );             \
    else                                                                        \
       result = _tab->tab[k] + (f-k)*(_tab->tab[k+1]-_tab->tab[k]);     \