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95 lines
3.8 KiB
C
95 lines
3.8 KiB
C
/*
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* Mesa 3-D graphics library
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* Version: 6.5.2
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*
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* Copyright (C) 1999-2006 Brian Paul All Rights Reserved.
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*
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* Permission is hereby granted, free of charge, to any person obtaining a
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* copy of this software and associated documentation files (the "Software"),
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* to deal in the Software without restriction, including without limitation
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* the rights to use, copy, modify, merge, publish, distribute, sublicense,
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* and/or sell copies of the Software, and to permit persons to whom the
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* Software is furnished to do so, subject to the following conditions:
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*
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* The above copyright notice and this permission notice shall be included
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* in all copies or substantial portions of the Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
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* OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
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* BRIAN PAUL BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN
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* AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
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* CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
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*/
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/*
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* Implement the effect of glColorMask and glIndexMask in software.
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*/
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#include <precomp.h>
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/**
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* Apply the color mask to a span of rgba values.
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*/
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void
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_swrast_mask_rgba_span(struct gl_context *ctx, struct gl_renderbuffer *rb,
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SWspan *span)
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{
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const GLuint n = span->end;
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void *rbPixels;
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ASSERT(n < MAX_WIDTH);
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ASSERT(span->arrayMask & SPAN_RGBA);
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rbPixels = _swrast_get_dest_rgba(ctx, rb, span);
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/*
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* Do component masking.
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* Note that we're not using span->array->mask[] here. We could...
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*/
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if (span->array->ChanType == GL_UNSIGNED_BYTE) {
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/* treat 4xGLubyte as 1xGLuint */
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const GLuint srcMask = *((GLuint *) ctx->Color.ColorMask);
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const GLuint dstMask = ~srcMask;
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const GLuint *dst = (const GLuint *) rbPixels;
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GLuint *src = (GLuint *) span->array->rgba8;
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GLuint i;
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for (i = 0; i < n; i++) {
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src[i] = (src[i] & srcMask) | (dst[i] & dstMask);
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}
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}
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else if (span->array->ChanType == GL_UNSIGNED_SHORT) {
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/* 2-byte components */
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/* XXX try to use 64-bit arithmetic someday */
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const GLushort rMask = ctx->Color.ColorMask[RCOMP] ? 0xffff : 0x0;
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const GLushort gMask = ctx->Color.ColorMask[GCOMP] ? 0xffff : 0x0;
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const GLushort bMask = ctx->Color.ColorMask[BCOMP] ? 0xffff : 0x0;
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const GLushort aMask = ctx->Color.ColorMask[ACOMP] ? 0xffff : 0x0;
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const GLushort (*dst)[4] = (const GLushort (*)[4]) rbPixels;
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GLushort (*src)[4] = span->array->rgba16;
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GLuint i;
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for (i = 0; i < n; i++) {
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src[i][RCOMP] = (src[i][RCOMP] & rMask) | (dst[i][RCOMP] & ~rMask);
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src[i][GCOMP] = (src[i][GCOMP] & gMask) | (dst[i][GCOMP] & ~gMask);
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src[i][BCOMP] = (src[i][BCOMP] & bMask) | (dst[i][BCOMP] & ~bMask);
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src[i][ACOMP] = (src[i][ACOMP] & aMask) | (dst[i][ACOMP] & ~aMask);
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}
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}
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else {
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/* 4-byte components */
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const GLuint rMask = ctx->Color.ColorMask[RCOMP] ? ~0x0 : 0x0;
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const GLuint gMask = ctx->Color.ColorMask[GCOMP] ? ~0x0 : 0x0;
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const GLuint bMask = ctx->Color.ColorMask[BCOMP] ? ~0x0 : 0x0;
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const GLuint aMask = ctx->Color.ColorMask[ACOMP] ? ~0x0 : 0x0;
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const GLuint (*dst)[4] = (const GLuint (*)[4]) rbPixels;
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GLuint (*src)[4] = (GLuint (*)[4]) span->array->attribs[FRAG_ATTRIB_COL];
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GLuint i;
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for (i = 0; i < n; i++) {
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src[i][RCOMP] = (src[i][RCOMP] & rMask) | (dst[i][RCOMP] & ~rMask);
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src[i][GCOMP] = (src[i][GCOMP] & gMask) | (dst[i][GCOMP] & ~gMask);
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src[i][BCOMP] = (src[i][BCOMP] & bMask) | (dst[i][BCOMP] & ~bMask);
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src[i][ACOMP] = (src[i][ACOMP] & aMask) | (dst[i][ACOMP] & ~aMask);
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}
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}
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}
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