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/* $Id: masking.c,v 1.1 1996/09/13 01:38:16 brianp Exp $ */
/*
* Mesa 3-D graphics library
* Version: 2.0
* Copyright (C) 1995-1996 Brian Paul
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Library General Public
* License as published by the Free Software Foundation; either
* version 2 of the License, or (at your option) any later version.
*
* This library is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Library General Public License for more details.
*
* You should have received a copy of the GNU Library General Public
* License along with this library; if not, write to the Free
* Software Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
*/
/*
* $Log: masking.c,v $
* Revision 1.1 1996/09/13 01:38:16 brianp
* Initial revision
*
*/
/*
* Implement the effect of glColorMask and glIndexMask in software.
*/
#include <string.h>
#include "alphabuf.h"
#include "context.h"
#include "macros.h"
#include "masking.h"
#include "pb.h"
#include "types.h"
void gl_IndexMask( GLcontext *ctx, GLuint mask )
{
if (INSIDE_BEGIN_END(ctx)) {
gl_error( ctx, GL_INVALID_OPERATION, "glIndexMask" );
return;
}
ctx->Color.IndexMask = mask;
ctx->NewState |= NEW_RASTER_OPS;
}
void gl_ColorMask( GLcontext *ctx, GLboolean red, GLboolean green,
GLboolean blue, GLboolean alpha )
{
if (INSIDE_BEGIN_END(ctx)) {
gl_error( ctx, GL_INVALID_OPERATION, "glColorMask" );
return;
}
ctx->Color.ColorMask = (red << 3) | (green << 2) | (blue << 1) | alpha;
ctx->NewState |= NEW_RASTER_OPS;
}
/*
* Implement glColorMask for a span of RGBA pixels.
*/
void gl_mask_color_span( GLcontext *ctx,
GLuint n, GLint x, GLint y,
GLubyte red[], GLubyte green[],
GLubyte blue[], GLubyte alpha[] )
{
GLubyte r[MAX_WIDTH], g[MAX_WIDTH], b[MAX_WIDTH], a[MAX_WIDTH];
(*ctx->Driver.ReadColorSpan)( ctx, n, x, y, r, g, b, a );
if (ctx->RasterMask & ALPHABUF_BIT) {
gl_read_alpha_span( ctx, n, x, y, a );
}
if ((ctx->Color.ColorMask & 8) == 0) {
/* replace source reds with frame buffer reds */
MEMCPY( red, r, n );
}
if ((ctx->Color.ColorMask & 4) == 0) {
/* replace source greens with frame buffer greens */
MEMCPY( green, g, n );
}
if ((ctx->Color.ColorMask & 2) == 0) {
/* replace source blues with frame buffer blues */
MEMCPY( blue, b, n );
}
if ((ctx->Color.ColorMask & 1) == 0) {
/* replace source alphas with frame buffer alphas */
MEMCPY( alpha, a, n );
}
}
/*
* Implement glColorMask for an array of RGBA pixels.
*/
void gl_mask_color_pixels( GLcontext *ctx,
GLuint n, const GLint x[], const GLint y[],
GLubyte red[], GLubyte green[],
GLubyte blue[], GLubyte alpha[],
const GLubyte mask[] )
{
GLubyte r[PB_SIZE], g[PB_SIZE], b[PB_SIZE], a[PB_SIZE];
(*ctx->Driver.ReadColorPixels)( ctx, n, x, y, r, g, b, a, mask );
if (ctx->RasterMask & ALPHABUF_BIT) {
gl_read_alpha_pixels( ctx, n, x, y, a, mask );
}
if ((ctx->Color.ColorMask & 8) == 0) {
/* replace source reds with frame buffer reds */
MEMCPY( red, r, n );
}
if ((ctx->Color.ColorMask & 4) == 0) {
/* replace source greens with frame buffer greens */
MEMCPY( green, g, n );
}
if ((ctx->Color.ColorMask & 2) == 0) {
/* replace source blues with frame buffer blues */
MEMCPY( blue, b, n );
}
if ((ctx->Color.ColorMask & 1) == 0) {
/* replace source alphas with frame buffer alphas */
MEMCPY( alpha, a, n );
}
}
/*
* Implement glIndexMask for 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;
(*ctx->Driver.ReadIndexSpan)( ctx, n, x, y, fbindexes );
msrc = ctx->Color.IndexMask;
mdest = ~msrc;
for (i=0;i<n;i++) {
index[i] = (index[i] & msrc) | (fbindexes[i] & mdest);
}
}
/*
* Implement glIndexMask for 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[MAX_WIDTH];
GLuint msrc, mdest;
(*ctx->Driver.ReadIndexPixels)( 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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