| /* |
| * 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. |
| */ |
| |
| |
| /* |
| * Implement the effect of glColorMask and glIndexMask in software. |
| */ |
| |
| |
| #include "main/glheader.h" |
| #include "main/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(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); |
| |
| rbPixels = _swrast_get_dest_rgba(ctx, rb, span); |
| |
| /* |
| * Do component masking. |
| * Note that we're not using span->array->mask[] here. We could... |
| */ |
| if (span->array->ChanType == GL_UNSIGNED_BYTE) { |
| GLuint srcMask; |
| memcpy(&srcMask, ctx->Color.ColorMask[buf], sizeof(srcMask)); |
| 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); |
| } |
| } |
| } |