0,0 → 1,102 |
/* |
* Mesa 3-D graphics library |
* |
* 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 |
* THE AUTHORS OR COPYRIGHT HOLDERS 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. |
*/ |
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/* |
* Implement the effect of glColorMask and glIndexMask in software. |
*/ |
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#include "main/glheader.h" |
#include "main/macros.h" |
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#include "s_context.h" |
#include "s_masking.h" |
#include "s_span.h" |
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/** |
* Apply the color mask to a span of rgba values. |
*/ |
void |
_swrast_mask_rgba_span(struct gl_context *ctx, struct gl_renderbuffer *rb, |
SWspan *span, GLuint buf) |
{ |
const GLuint n = span->end; |
void *rbPixels; |
|
assert(n < SWRAST_MAX_WIDTH); |
assert(span->arrayMask & SPAN_RGBA); |
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rbPixels = _swrast_get_dest_rgba(ctx, rb, span); |
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/* |
* Do component masking. |
* Note that we're not using span->array->mask[] here. We could... |
*/ |
if (span->array->ChanType == GL_UNSIGNED_BYTE) { |
/* treat 4xGLubyte as 1xGLuint */ |
const GLuint srcMask = *((GLuint *) ctx->Color.ColorMask[buf]); |
const GLuint dstMask = ~srcMask; |
const GLuint *dst = (const GLuint *) rbPixels; |
GLuint *src = (GLuint *) span->array->rgba8; |
GLuint i; |
for (i = 0; i < n; i++) { |
src[i] = (src[i] & srcMask) | (dst[i] & dstMask); |
} |
} |
else if (span->array->ChanType == GL_UNSIGNED_SHORT) { |
/* 2-byte components */ |
/* XXX try to use 64-bit arithmetic someday */ |
const GLushort rMask = ctx->Color.ColorMask[buf][RCOMP] ? 0xffff : 0x0; |
const GLushort gMask = ctx->Color.ColorMask[buf][GCOMP] ? 0xffff : 0x0; |
const GLushort bMask = ctx->Color.ColorMask[buf][BCOMP] ? 0xffff : 0x0; |
const GLushort aMask = ctx->Color.ColorMask[buf][ACOMP] ? 0xffff : 0x0; |
const GLushort (*dst)[4] = (const GLushort (*)[4]) rbPixels; |
GLushort (*src)[4] = span->array->rgba16; |
GLuint i; |
for (i = 0; i < n; i++) { |
src[i][RCOMP] = (src[i][RCOMP] & rMask) | (dst[i][RCOMP] & ~rMask); |
src[i][GCOMP] = (src[i][GCOMP] & gMask) | (dst[i][GCOMP] & ~gMask); |
src[i][BCOMP] = (src[i][BCOMP] & bMask) | (dst[i][BCOMP] & ~bMask); |
src[i][ACOMP] = (src[i][ACOMP] & aMask) | (dst[i][ACOMP] & ~aMask); |
} |
} |
else { |
/* 4-byte components */ |
const GLuint rMask = ctx->Color.ColorMask[buf][RCOMP] ? ~0x0 : 0x0; |
const GLuint gMask = ctx->Color.ColorMask[buf][GCOMP] ? ~0x0 : 0x0; |
const GLuint bMask = ctx->Color.ColorMask[buf][BCOMP] ? ~0x0 : 0x0; |
const GLuint aMask = ctx->Color.ColorMask[buf][ACOMP] ? ~0x0 : 0x0; |
const GLuint (*dst)[4] = (const GLuint (*)[4]) rbPixels; |
GLuint (*src)[4] = (GLuint (*)[4]) span->array->attribs[VARYING_SLOT_COL0]; |
GLuint i; |
for (i = 0; i < n; i++) { |
src[i][RCOMP] = (src[i][RCOMP] & rMask) | (dst[i][RCOMP] & ~rMask); |
src[i][GCOMP] = (src[i][GCOMP] & gMask) | (dst[i][GCOMP] & ~gMask); |
src[i][BCOMP] = (src[i][BCOMP] & bMask) | (dst[i][BCOMP] & ~bMask); |
src[i][ACOMP] = (src[i][ACOMP] & aMask) | (dst[i][ACOMP] & ~aMask); |
} |
} |
} |