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/*
* Mesa 3-D graphics library
* Version: 6.5.2
*
* Copyright (C) 1999-2006 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 "macros.h"
#include "s_context.h"
#include "s_masking.h"
#include "s_span.h"
/**
* Apply the color mask to a span of rgba values.
*/
void
_swrast_mask_rgba_span(GLcontext *ctx, struct gl_renderbuffer *rb,
struct sw_span *span)
{
GLchan dest[MAX_WIDTH][4];
#if CHAN_BITS == 8
GLuint srcMask = *((GLuint*)ctx->Color.ColorMask);
GLuint dstMask = ~srcMask;
GLuint *rgba32 = (GLuint *) span->array->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_get_values(ctx, rb, n, span->array->x, span->array->y,
dest, 4 * sizeof(GLchan));
}
else {
_swrast_read_rgba_span(ctx, rb, 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) span->array->rgba[i][RCOMP] = dest[i][RCOMP];
if (!gMask) span->array->rgba[i][GCOMP] = dest[i][GCOMP];
if (!bMask) span->array->rgba[i][BCOMP] = dest[i][BCOMP];
if (!aMask) span->array->rgba[i][ACOMP] = dest[i][ACOMP];
}
#endif
}
/**
* Apply the index mask to a span of color index values.
*/
void
_swrast_mask_ci_span(GLcontext *ctx, struct gl_renderbuffer *rb,
struct sw_span *span)
{
const GLuint srcMask = ctx->Color.IndexMask;
const GLuint dstMask = ~srcMask;
GLuint *index = span->array->index;
GLuint dest[MAX_WIDTH];
GLuint i;
ASSERT(span->arrayMask & SPAN_INDEX);
ASSERT(span->end <= MAX_WIDTH);
ASSERT(rb->DataType == GL_UNSIGNED_INT);
if (span->arrayMask & SPAN_XY) {
_swrast_get_values(ctx, rb, span->end, span->array->x, span->array->y,
dest, sizeof(GLuint));
}
else {
_swrast_read_index_span(ctx, rb, span->end, span->x, span->y, dest);
}
for (i = 0; i < span->end; i++) {
index[i] = (index[i] & srcMask) | (dest[i] & dstMask);
}
}
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