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/*
* Mesa 3-D graphics library
* Version: 3.3
*
* Copyright (C) 1999 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.
*/
#ifdef PC_HEADER
#include "all.h"
#else
#include "glheader.h"
#include "alphabuf.h"
#include "context.h"
#include "enums.h"
#include "macros.h"
#include "masking.h"
#include "pb.h"
#include "span.h"
#include "types.h"
#endif
void
_mesa_IndexMask( GLuint mask )
{
GET_CURRENT_CONTEXT(ctx);
ASSERT_OUTSIDE_BEGIN_END_AND_FLUSH(ctx, "glIndexMask");
ctx->Color.IndexMask = mask;
ctx->NewState |= NEW_RASTER_OPS;
}
void
_mesa_ColorMask( GLboolean red, GLboolean green,
GLboolean blue, GLboolean alpha )
{
GET_CURRENT_CONTEXT(ctx);
ASSERT_OUTSIDE_BEGIN_END_AND_FLUSH(ctx, "glColorMask");
if (MESA_VERBOSE & VERBOSE_API)
fprintf(stderr, "glColorMask %d %d %d %d\n", red, green, blue, alpha);
ctx->Color.ColorMask[RCOMP] = red ? 0xff : 0x0;
ctx->Color.ColorMask[GCOMP] = green ? 0xff : 0x0;
ctx->Color.ColorMask[BCOMP] = blue ? 0xff : 0x0;
ctx->Color.ColorMask[ACOMP] = alpha ? 0xff : 0x0;
if (ctx->Driver.ColorMask)
ctx->Driver.ColorMask( ctx, red, green, blue, alpha );
ctx->NewState |= NEW_RASTER_OPS;
}
/*
* Apply glColorMask to a span of RGBA pixels.
*/
void gl_mask_rgba_span( GLcontext *ctx,
GLuint n, GLint x, GLint y, GLubyte rgba[][4] )
{
GLubyte dest[MAX_WIDTH][4];
GLuint srcMask = *((GLuint*)ctx->Color.ColorMask);
GLuint dstMask = ~srcMask;
GLuint *rgba32 = (GLuint *) rgba;
GLuint *dest32 = (GLuint *) dest;
GLuint i;
gl_read_rgba_span( ctx, ctx->DrawBuffer, n, x, y, dest );
for (i=0; i<n; i++) {
rgba32[i] = (rgba32[i] & srcMask) | (dest32[i] & dstMask);
}
}
/*
* Apply glColorMask to an array of RGBA pixels.
*/
void gl_mask_rgba_pixels( GLcontext *ctx,
GLuint n, const GLint x[], const GLint y[],
GLubyte rgba[][4], const GLubyte mask[] )
{
GLubyte dest[PB_SIZE][4];
GLuint srcMask = *((GLuint*)ctx->Color.ColorMask);
GLuint dstMask = ~srcMask;
GLuint *rgba32 = (GLuint *) rgba;
GLuint *dest32 = (GLuint *) dest;
GLuint i;
(*ctx->Driver.ReadRGBAPixels)( ctx, n, x, y, dest, mask );
if (ctx->RasterMask & ALPHABUF_BIT) {
gl_read_alpha_pixels( ctx, n, x, y, dest, mask );
}
for (i=0; i<n; i++) {
rgba32[i] = (rgba32[i] & srcMask) | (dest32[i] & dstMask);
}
}
/*
* Apply glIndexMask to a span of CI pixels.
*/
void gl_mask_index_span( GLcontext *ctx,
GLuint n, GLint x, GLint y, GLuint index[] )
{
GLuint i;
GLuint fbindexes[MAX_WIDTH];
GLuint msrc, mdest;
gl_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);
}
}
/*
* Apply glIndexMask to an array of CI pixels.
*/
void gl_mask_index_pixels( GLcontext *ctx,
GLuint n, const GLint x[], const GLint y[],
GLuint index[], const GLubyte mask[] )
{
GLuint i;
GLuint fbindexes[PB_SIZE];
GLuint msrc, mdest;
(*ctx->Driver.ReadCI32Pixels)( ctx, n, x, y, fbindexes, mask );
msrc = ctx->Color.IndexMask;
mdest = ~msrc;
for (i=0;i<n;i++) {
index[i] = (index[i] & msrc) | (fbindexes[i] & mdest);
}
}
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