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fixed GL_SRC_ALPHA_SATURATE bug, lots clean-up

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This commit is contained in:
Brian Paul 2000-02-21 14:50:31 +00:00
parent 5df6816e2c
commit 0e3342ea29
1 changed files with 27 additions and 26 deletions
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53
src/mesa/main/blend.c
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@ -1,4 +1,4 @@
/* $Id: blend.c,v 1.11 2000/02/02 22:08:26 brianp Exp $ */
/* $Id: blend.c,v 1.12 2000/02/21 14:50:31 brianp Exp $ */
/*
* Mesa 3-D graphics library
@ -286,26 +286,27 @@ blend_transparency( GLcontext *ctx, GLuint n, const GLubyte mask[],
for (i=0;i<n;i++) {
if (mask[i]) {
GLint t = rgba[i][ACOMP]; /* t in [0,255] */
const GLint t = rgba[i][ACOMP]; /* t in [0,255] */
if (t == 0) {
/* 0% alpha */
rgba[i][RCOMP] = dest[i][RCOMP];
rgba[i][GCOMP] = dest[i][GCOMP];
rgba[i][BCOMP] = dest[i][BCOMP];
rgba[i][ACOMP] = dest[i][ACOMP];
}
else if (t == 255) {
/* no-op */
else if (t == CHAN_MAX) {
/* 100% alpha, no-op */
}
else {
GLint s = 255 - t;
GLint r = (rgba[i][RCOMP] * t + dest[i][RCOMP] * s) >> 8;
GLint g = (rgba[i][GCOMP] * t + dest[i][GCOMP] * s) >> 8;
GLint b = (rgba[i][BCOMP] * t + dest[i][BCOMP] * s) >> 8;
GLint a = (rgba[i][ACOMP] * t + dest[i][ACOMP] * s) >> 8;
ASSERT(r <= 255);
ASSERT(g <= 255);
ASSERT(b <= 255);
ASSERT(a <= 255);
const GLint s = CHAN_MAX - t;
const GLint r = (rgba[i][RCOMP] * t + dest[i][RCOMP] * s) >> 8;
const GLint g = (rgba[i][GCOMP] * t + dest[i][GCOMP] * s) >> 8;
const GLint b = (rgba[i][BCOMP] * t + dest[i][BCOMP] * s) >> 8;
const GLint a = (rgba[i][ACOMP] * t + dest[i][ACOMP] * s) >> 8;
ASSERT(r <= CHAN_MAX);
ASSERT(g <= CHAN_MAX);
ASSERT(b <= CHAN_MAX);
ASSERT(a <= CHAN_MAX);
rgba[i][RCOMP] = (GLubyte) r;
rgba[i][GCOMP] = (GLubyte) g;
rgba[i][BCOMP] = (GLubyte) b;
@ -336,10 +337,10 @@ blend_add( GLcontext *ctx, GLuint n, const GLubyte mask[],
GLint g = rgba[i][GCOMP] + dest[i][GCOMP];
GLint b = rgba[i][BCOMP] + dest[i][BCOMP];
GLint a = rgba[i][ACOMP] + dest[i][ACOMP];
rgba[i][RCOMP] = (GLubyte) MIN2( r, 255 );
rgba[i][GCOMP] = (GLubyte) MIN2( g, 255 );
rgba[i][BCOMP] = (GLubyte) MIN2( b, 255 );
rgba[i][ACOMP] = (GLubyte) MIN2( a, 255 );
rgba[i][RCOMP] = (GLubyte) MIN2( r, CHAN_MAX );
rgba[i][GCOMP] = (GLubyte) MIN2( g, CHAN_MAX );
rgba[i][BCOMP] = (GLubyte) MIN2( b, CHAN_MAX );
rgba[i][ACOMP] = (GLubyte) MIN2( a, CHAN_MAX );
}
}
}
@ -429,10 +430,10 @@ static void _BLENDAPI
blend_general( GLcontext *ctx, GLuint n, const GLubyte mask[],
GLubyte rgba[][4], CONST GLubyte dest[][4] )
{
GLfloat rscale = 1.0F / 255.0F;
GLfloat gscale = 1.0F / 255.0F;
GLfloat bscale = 1.0F / 255.0F;
GLfloat ascale = 1.0F / 255.0F;
GLfloat rscale = 1.0F / CHAN_MAXF;
GLfloat gscale = 1.0F / CHAN_MAXF;
GLfloat bscale = 1.0F / CHAN_MAXF;
GLfloat ascale = 1.0F / CHAN_MAXF;
GLuint i;
for (i=0;i<n;i++) {
@ -486,7 +487,7 @@ blend_general( GLcontext *ctx, GLuint n, const GLubyte mask[],
sR = sG = sB = 1.0F - (GLfloat) Ad * ascale;
break;
case GL_SRC_ALPHA_SATURATE:
if (As < 1.0F - (GLfloat) Ad * ascale) {
if (As < CHAN_MAX - Ad) {
sR = sG = sB = (GLfloat) As * ascale;
}
else {
@ -705,10 +706,10 @@ blend_general( GLcontext *ctx, GLuint n, const GLubyte mask[],
}
/* final clamping */
rgba[i][RCOMP] = (GLubyte) (GLint) CLAMP( r, 0.0F, 255.0F );
rgba[i][GCOMP] = (GLubyte) (GLint) CLAMP( g, 0.0F, 255.0F );
rgba[i][BCOMP] = (GLubyte) (GLint) CLAMP( b, 0.0F, 255.0F );
rgba[i][ACOMP] = (GLubyte) (GLint) CLAMP( a, 0.0F, 255.0F );
rgba[i][RCOMP] = (GLubyte) (GLint) CLAMP( r, 0.0F, CHAN_MAXF );
rgba[i][GCOMP] = (GLubyte) (GLint) CLAMP( g, 0.0F, CHAN_MAXF );
rgba[i][BCOMP] = (GLubyte) (GLint) CLAMP( b, 0.0F, CHAN_MAXF );
rgba[i][ACOMP] = (GLubyte) (GLint) CLAMP( a, 0.0F, CHAN_MAXF );
}
}
}