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faster blending (Jose Fonseca)

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This commit is contained in:
Brian Paul 2002-04-02 16:16:45 +00:00
parent 01bcd83def
commit 17b7cc4cae
1 changed files with 13 additions and 1 deletions
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14
src/mesa/swrast/s_blend.c
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@ -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;