diff options
Diffstat (limited to 'src/mesa/main/blend.c')
| -rw-r--r-- | src/mesa/main/blend.c | 16 |
1 files changed, 10 insertions, 6 deletions
diff --git a/src/mesa/main/blend.c b/src/mesa/main/blend.c index 65f890d10f..4f20d269ac 100644 --- a/src/mesa/main/blend.c +++ b/src/mesa/main/blend.c @@ -1,4 +1,4 @@ -/* $Id: blend.c,v 1.22 2000/10/30 13:31:59 keithw Exp $ */ +/* $Id: blend.c,v 1.23 2000/10/30 16:32:43 brianp Exp $ */ /* * Mesa 3-D graphics library @@ -370,19 +370,23 @@ blend_transparency( GLcontext *ctx, GLuint n, const GLubyte mask[], const GLint b = (rgba[i][BCOMP] * t + dest[i][BCOMP] * s) / 255; const GLint a = (rgba[i][ACOMP] * t + dest[i][ACOMP] * s) / 255; #else +#if CHAN_BITS == 8 /* This satisfies Glean and should be reasonably fast */ /* Contributed by Nathan Hand */ -#if CHAN_BITS == 8 #define DIV255(X) (((X) << 8) + (X) + 256) >> 16 -#else -XXX todo -#endif const GLint s = CHAN_MAX - t; const GLint r = DIV255(rgba[i][RCOMP] * t + dest[i][RCOMP] * s); const GLint g = DIV255(rgba[i][GCOMP] * t + dest[i][GCOMP] * s); const GLint b = DIV255(rgba[i][BCOMP] * t + dest[i][BCOMP] * s); const GLint a = DIV255(rgba[i][ACOMP] * t + dest[i][ACOMP] * s); #undef DIV255 +#else + const GLint s = CHAN_MAX - t; + const GLint r = (rgba[i][RCOMP] * t + dest[i][RCOMP] * s) / CHAN_MAX; + const GLint g = (rgba[i][GCOMP] * t + dest[i][GCOMP] * s) / CHAN_MAX; + const GLint b = (rgba[i][BCOMP] * t + dest[i][BCOMP] * s) / CHAN_MAX; + const GLint a = (rgba[i][ACOMP] * t + dest[i][ACOMP] * s) / CHAN_MAX; +#endif #endif ASSERT(r <= CHAN_MAX); ASSERT(g <= CHAN_MAX); @@ -926,7 +930,7 @@ _mesa_blend_span( GLcontext *ctx, GLuint n, GLint x, GLint y, void _mesa_blend_pixels( GLcontext *ctx, GLuint n, const GLint x[], const GLint y[], - GLchan rgba[][4], const GLchan mask[] ) + GLchan rgba[][4], const GLubyte mask[] ) { GLchan dest[PB_SIZE][4]; |