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/* $Id: s_masking.c,v 1.8 2002/08/07 00:45:07 brianp Exp $ */
/*
* Mesa 3-D graphics library
* Version: 4.1
*
* Copyright (C) 1999-2002 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"),
* to deal in the Software without restriction, including without limitation
* the rights to use, copy, modify, merge, publish, distribute, sublicense,
* and/or sell copies of the Software, and to permit persons to whom the
* Software is furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice shall be included
* in all copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
* OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
* BRIAN PAUL BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN
* AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
* CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
*/
/*
* Implement the effect of glColorMask and glIndexMask in software.
*/
#include "glheader.h"
#include "enums.h"
#include "macros.h"
#include "s_alphabuf.h"
#include "s_context.h"
#include "s_masking.h"
#include "s_span.h"
void
_mesa_mask_rgba_span( GLcontext *ctx, const struct sw_span *span,
GLchan rgba[][4] )
{
SWcontext *swrast = SWRAST_CONTEXT(ctx);
GLchan dest[MAX_WIDTH][4];
#if CHAN_BITS == 8
GLuint srcMask = *((GLuint*)ctx->Color.ColorMask);
GLuint dstMask = ~srcMask;
GLuint *rgba32 = (GLuint *) rgba;
GLuint *dest32 = (GLuint *) dest;
#else
const GLboolean rMask = ctx->Color.ColorMask[RCOMP];
const GLboolean gMask = ctx->Color.ColorMask[GCOMP];
const GLboolean bMask = ctx->Color.ColorMask[BCOMP];
const GLboolean aMask = ctx->Color.ColorMask[ACOMP];
#endif
const GLuint n = span->end;
GLuint i;
ASSERT(n < MAX_WIDTH);
ASSERT(span->arrayMask & SPAN_RGBA);
if (span->arrayMask & SPAN_XY) {
(*swrast->Driver.ReadRGBAPixels)(ctx, n, span->array->x, span->array->y,
dest, span->array->mask);
if (SWRAST_CONTEXT(ctx)->_RasterMask & ALPHABUF_BIT) {
_mesa_read_alpha_pixels(ctx, n, span->array->x, span->array->y,
dest, span->array->mask);
}
}
else {
_mesa_read_rgba_span(ctx, ctx->DrawBuffer, n, span->x, span->y, dest);
}
#if CHAN_BITS == 8
for (i = 0; i < n; i++) {
rgba32[i] = (rgba32[i] & srcMask) | (dest32[i] & dstMask);
}
#else
for (i = 0; i < n; i++) {
if (!rMask) rgba[i][RCOMP] = dest[i][RCOMP];
if (!gMask) rgba[i][GCOMP] = dest[i][GCOMP];
if (!bMask) rgba[i][BCOMP] = dest[i][BCOMP];
if (!aMask) rgba[i][ACOMP] = dest[i][ACOMP];
}
#endif
}
/*
* Apply glColorMask to a span of RGBA pixels.
*/
void
_mesa_mask_rgba_array( GLcontext *ctx,
GLuint n, GLint x, GLint y, GLchan rgba[][4] )
{
GLchan dest[MAX_WIDTH][4];
GLuint i;
#if CHAN_BITS == 8
GLuint srcMask = *((GLuint*)ctx->Color.ColorMask);
GLuint dstMask = ~srcMask;
GLuint *rgba32 = (GLuint *) rgba;
GLuint *dest32 = (GLuint *) dest;
_mesa_read_rgba_span( ctx, ctx->DrawBuffer, n, x, y, dest );
for (i = 0; i < n; i++) {
rgba32[i] = (rgba32[i] & srcMask) | (dest32[i] & dstMask);
}
#else
const GLint rMask = ctx->Color.ColorMask[RCOMP];
const GLint gMask = ctx->Color.ColorMask[GCOMP];
const GLint bMask = ctx->Color.ColorMask[BCOMP];
const GLint aMask = ctx->Color.ColorMask[ACOMP];
_mesa_read_rgba_span( ctx, ctx->DrawBuffer, n, x, y, dest );
for (i = 0; i < n; i++) {
if (!rMask) rgba[i][RCOMP] = dest[i][RCOMP];
if (!gMask) rgba[i][GCOMP] = dest[i][GCOMP];
if (!bMask) rgba[i][BCOMP] = dest[i][BCOMP];
if (!aMask) rgba[i][ACOMP] = dest[i][ACOMP];
}
#endif
}
void
_mesa_mask_index_span( GLcontext *ctx, const struct sw_span *span,
GLuint index[] )
{
SWcontext *swrast = SWRAST_CONTEXT(ctx);
const GLuint msrc = ctx->Color.IndexMask;
const GLuint mdest = ~msrc;
GLuint fbindexes[MAX_WIDTH];
GLuint i;
ASSERT(span->arrayMask & SPAN_INDEX);
ASSERT(span->end < MAX_WIDTH);
if (span->arrayMask & SPAN_XY) {
(*swrast->Driver.ReadCI32Pixels)(ctx, span->end, span->array->x,
span->array->y, fbindexes,
span->array->mask);
for (i = 0; i < span->end; i++) {
index[i] = (index[i] & msrc) | (fbindexes[i] & mdest);
}
}
else {
_mesa_read_index_span(ctx, ctx->DrawBuffer, span->end, span->x, span->y,
fbindexes );
for (i = 0; i < span->end; i++) {
index[i] = (index[i] & msrc) | (fbindexes[i] & mdest);
}
}
}
/*
* Apply glIndexMask to a span of CI pixels.
*/
void
_mesa_mask_index_array( GLcontext *ctx,
GLuint n, GLint x, GLint y, GLuint index[] )
{
GLuint i;
GLuint fbindexes[MAX_WIDTH];
GLuint msrc, mdest;
_mesa_read_index_span( ctx, ctx->DrawBuffer, n, x, y, fbindexes );
msrc = ctx->Color.IndexMask;
mdest = ~msrc;
for (i=0;i<n;i++) {
index[i] = (index[i] & msrc) | (fbindexes[i] & mdest);
}
}
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