mesa: fix AL44 texture fetch function nybble -> float conversion

Fixes http://bugs.freedesktop.org/show_bug.cgi?id=32804

diff --git a/src/mesa/main/texfetch_tmp.h b/src/mesa/main/texfetch_tmp.h
index 2de41f31d0e70cc7659dd92a4784a84e39042191..9d57ad7679bd2a59b8d5acca0746ba7f1412d7e0 100644 (file)
--- a/src/mesa/main/texfetch_tmp.h
+++ b/src/mesa/main/texfetch_tmp.h
@@ -899,8 +899,8 @@ static void FETCH(f_al44)( const struct gl_texture_image *texImage,
    const GLubyte s = *TEXEL_ADDR(GLubyte, texImage, i, j, k, 1);
    texel[RCOMP] =
    texel[GCOMP] =
-   texel[BCOMP] = UBYTE_TO_FLOAT( (s & 0x0f) << 4 );
-   texel[ACOMP] = UBYTE_TO_FLOAT(  s & 0xf0 );
+   texel[BCOMP] = (s & 0xf) * (1.0F / 15.0F);
+   texel[ACOMP] = ((s >> 4) & 0xf) * (1.0F / 15.0F);
 }
 
 #if DIM == 3