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fix float color interpolation (bug 694461)

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This commit is contained in:
Brian Paul 2003-02-27 18:15:18 +00:00
parent 759c8f92e9
commit 6a98bef961
1 changed files with 25 additions and 14 deletions
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39
src/mesa/swrast/s_span.c
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@ -1,10 +1,10 @@
/* $Id: s_span.c,v 1.54 2003/01/14 04:55:46 brianp Exp $ */
/* $Id: s_span.c,v 1.55 2003/02/27 18:15:18 brianp Exp $ */
/*
* Mesa 3-D graphics library
* Version: 5.0.1
*
* Copyright (C) 1999-2002 Brian Paul All Rights Reserved.
* Copyright (C) 1999-2003 Brian Paul All Rights Reserved.
*
* Permission is hereby granted, free of charge, to any person obtaining a
* copy of this software and associated documentation files (the "Software"),
@ -141,14 +141,6 @@ _mesa_span_default_texcoords( GLcontext *ctx, struct sw_span *span )
static void
interpolate_colors(GLcontext *ctx, struct sw_span *span)
{
GLfixed r = span->red;
GLfixed g = span->green;
GLfixed b = span->blue;
GLfixed a = span->alpha;
const GLint dr = span->redStep;
const GLint dg = span->greenStep;
const GLint db = span->blueStep;
const GLint da = span->alphaStep;
const GLuint n = span->end;
GLchan (*rgba)[4] = span->array->rgba;
GLuint i;
@ -159,16 +151,35 @@ interpolate_colors(GLcontext *ctx, struct sw_span *span)
if (span->interpMask & SPAN_FLAT) {
/* constant color */
GLchan color[4];
color[RCOMP] = FixedToChan(r);
color[GCOMP] = FixedToChan(g);
color[BCOMP] = FixedToChan(b);
color[ACOMP] = FixedToChan(a);
color[RCOMP] = FixedToChan(span->red);
color[GCOMP] = FixedToChan(span->green);
color[BCOMP] = FixedToChan(span->blue);
color[ACOMP] = FixedToChan(span->alpha);
for (i = 0; i < n; i++) {
COPY_CHAN4(span->array->rgba[i], color);
}
}
else {
/* interpolate */
#if CHAN_TYPE == GL_FLOAT
GLfloat r = span->red;
GLfloat g = span->green;
GLfloat b = span->blue;
GLfloat a = span->alpha;
const GLfloat dr = span->redStep;
const GLfloat dg = span->greenStep;
const GLfloat db = span->blueStep;
const GLfloat da = span->alphaStep;
#else
GLfixed r = span->red;
GLfixed g = span->green;
GLfixed b = span->blue;
GLfixed a = span->alpha;
const GLint dr = span->redStep;
const GLint dg = span->greenStep;
const GLint db = span->blueStep;
const GLint da = span->alphaStep;
#endif
for (i = 0; i < n; i++) {
rgba[i][RCOMP] = FixedToChan(r);
rgba[i][GCOMP] = FixedToChan(g);