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fd.o #BZ 9684

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gcc may cast an overflowed float value to an negative int value on i386,
  fix it to make sure at least some apps will not crash if it contains wrong normal data.
This commit is contained in:
Zou Nan hai 2007-02-12 12:16:49 +08:00
parent ee5417bca8
commit ebcc9b5d12
1 changed files with 2 additions and 1 deletions
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3
src/mesa/main/light.h
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@ -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]); \