diff options
Diffstat (limited to 'src/mesa/swrast/s_blend.c')
| -rw-r--r-- | src/mesa/swrast/s_blend.c | 14 |
1 files changed, 13 insertions, 1 deletions
diff --git a/src/mesa/swrast/s_blend.c b/src/mesa/swrast/s_blend.c index 05b38fd5807..f37a44015f1 100644 --- a/src/mesa/swrast/s_blend.c +++ b/src/mesa/swrast/s_blend.c @@ -1,4 +1,4 @@ -/* $Id: s_blend.c,v 1.14 2002/03/27 15:49:27 brianp Exp $ */ +/* $Id: s_blend.c,v 1.15 2002/04/02 16:16:45 brianp Exp $ */ /* * Mesa 3-D graphics library @@ -132,12 +132,24 @@ blend_transparency( GLcontext *ctx, GLuint n, const GLubyte mask[], #if CHAN_BITS == 8 /* This satisfies Glean and should be reasonably fast */ /* Contributed by Nathan Hand */ +#if 0 #define DIV255(X) (((X) << 8) + (X) + 256) >> 16 +#else + GLint temp; +#define DIV255(X) (temp = (X), ((temp << 8) + temp + 256) >> 16) +#endif +#if 0 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); +#else + const GLint r = DIV255((rgba[i][RCOMP] - dest[i][RCOMP]) * t) + dest[i][RCOMP]; + const GLint g = DIV255((rgba[i][GCOMP] - dest[i][GCOMP]) * t) + dest[i][GCOMP]; + const GLint b = DIV255((rgba[i][BCOMP] - dest[i][BCOMP]) * t) + dest[i][BCOMP]; + const GLint a = DIV255((rgba[i][ACOMP] - dest[i][ACOMP]) * t) + dest[i][ACOMP]; +#endif #undef DIV255 #elif CHAN_BITS == 16 const GLfloat tt = (GLfloat) t / CHAN_MAXF; |