diff options
Diffstat (limited to 'src/mesa/swrast')
| -rw-r--r-- | src/mesa/swrast/s_blend.c | 28 |
1 files changed, 9 insertions, 19 deletions
diff --git a/src/mesa/swrast/s_blend.c b/src/mesa/swrast/s_blend.c index f37a440..5fa7632 100644 --- a/src/mesa/swrast/s_blend.c +++ b/src/mesa/swrast/s_blend.c @@ -1,4 +1,4 @@ -/* $Id: s_blend.c,v 1.15 2002/04/02 16:16:45 brianp Exp $ */ +/* $Id: s_blend.c,v 1.16 2002/04/02 23:36:51 brianp Exp $ */ /* * Mesa 3-D graphics library @@ -138,33 +138,23 @@ blend_transparency( GLcontext *ctx, GLuint n, const GLubyte mask[], 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; - const GLfloat s = 1.0 - tt; - const GLint r = (GLint) (rgba[i][RCOMP] * tt + dest[i][RCOMP] * s); - const GLint g = (GLint) (rgba[i][GCOMP] * tt + dest[i][GCOMP] * s); - const GLint b = (GLint) (rgba[i][BCOMP] * tt + dest[i][BCOMP] * s); - const GLint a = (GLint) (rgba[i][ACOMP] * tt + dest[i][ACOMP] * s); + const GLint r = (GLint) ((rgba[i][RCOMP] - dest[i][RCOMP]) * tt + dest[i][RCOMP]); + const GLint g = (GLint) ((rgba[i][GCOMP] - dest[i][GCOMP]) * tt + dest[i][GCOMP]); + const GLint b = (GLint) ((rgba[i][BCOMP] - dest[i][BCOMP]) * tt + dest[i][BCOMP]); + const GLint a = (GLint) ((rgba[i][ACOMP] - dest[i][ACOMP]) * tt + dest[i][ACOMP]); #else /* CHAN_BITS == 32 */ const GLfloat tt = (GLfloat) t / CHAN_MAXF; - const GLfloat s = 1.0 - tt; - const GLfloat r = rgba[i][RCOMP] * tt + dest[i][RCOMP] * s; - const GLfloat g = rgba[i][GCOMP] * tt + dest[i][GCOMP] * s; - const GLfloat b = rgba[i][BCOMP] * tt + dest[i][BCOMP] * s; - const GLfloat a = rgba[i][ACOMP] * tt + dest[i][ACOMP] * s; + const GLfloat r = (rgba[i][RCOMP] - dest[i][RCOMP]) * tt + dest[i][RCOMP]; + const GLfloat g = (rgba[i][GCOMP] - dest[i][GCOMP]) * tt + dest[i][GCOMP]; + const GLfloat b = (rgba[i][BCOMP] - dest[i][BCOMP]) * tt + dest[i][BCOMP]; + const GLfloat a = (rgba[i][ACOMP] - dest[i][ACOMP]) * tt + dest[i][ACOMP]; #endif #endif ASSERT(r <= CHAN_MAX); |