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Diffstat (limited to 'src/mesa/swrast/s_masking.c')
| -rw-r--r-- | src/mesa/swrast/s_masking.c | 180 |
1 files changed, 180 insertions, 0 deletions
diff --git a/src/mesa/swrast/s_masking.c b/src/mesa/swrast/s_masking.c new file mode 100644 index 00000000000..5831edf9c01 --- /dev/null +++ b/src/mesa/swrast/s_masking.c @@ -0,0 +1,180 @@ +/* $Id: s_masking.c,v 1.1 2000/10/31 18:00:04 keithw Exp $ */ + +/* + * Mesa 3-D graphics library + * Version: 3.5 + * + * Copyright (C) 1999-2000 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 "enums.h" +#include "macros.h" + +#include "s_alphabuf.h" +#include "s_masking.h" +#include "s_pb.h" +#include "s_span.h" + + +/* + * Apply glColorMask to a span of RGBA pixels. + */ +void +_mesa_mask_rgba_span( GLcontext *ctx, + GLuint n, GLint x, GLint y, GLchan rgba[][4] ) +{ + GLchan dest[MAX_WIDTH][4]; + GLuint i; + +#if CHAN_BITS == 8 + + GLuint srcMask = *((GLuint*)ctx->Color.ColorMask); + GLuint dstMask = ~srcMask; + GLuint *rgba32 = (GLuint *) rgba; + GLuint *dest32 = (GLuint *) dest; + + gl_read_rgba_span( ctx, ctx->DrawBuffer, n, x, y, dest ); + for (i = 0; i < n; i++) { + rgba32[i] = (rgba32[i] & srcMask) | (dest32[i] & dstMask); + } + +#else + + const GLint rMask = ctx->Color.ColorMask[RCOMP]; + const GLint gMask = ctx->Color.ColorMask[GCOMP]; + const GLint bMask = ctx->Color.ColorMask[BCOMP]; + const GLint aMask = ctx->Color.ColorMask[ACOMP]; + + gl_read_rgba_span( ctx, ctx->DrawBuffer, n, x, y, dest ); + for (i = 0; i < n; i++) { + if (!rMask) rgba[i][RCOMP] = dest[i][RCOMP]; + if (!gMask) rgba[i][GCOMP] = dest[i][GCOMP]; + if (!bMask) rgba[i][BCOMP] = dest[i][BCOMP]; + if (!aMask) rgba[i][ACOMP] = dest[i][ACOMP]; + } + +#endif +} + + + +/* + * Apply glColorMask to an array of RGBA pixels. + */ +void +_mesa_mask_rgba_pixels( GLcontext *ctx, + GLuint n, const GLint x[], const GLint y[], + GLchan rgba[][4], const GLubyte mask[] ) +{ + GLchan dest[PB_SIZE][4]; + GLuint i; + +#if CHAN_BITS == 8 + + GLuint srcMask = *((GLuint*)ctx->Color.ColorMask); + GLuint dstMask = ~srcMask; + GLuint *rgba32 = (GLuint *) rgba; + GLuint *dest32 = (GLuint *) dest; + + (*ctx->Driver.ReadRGBAPixels)( ctx, n, x, y, dest, mask ); + if (ctx->RasterMask & ALPHABUF_BIT) { + _mesa_read_alpha_pixels( ctx, n, x, y, dest, mask ); + } + + for (i=0; i<n; i++) { + rgba32[i] = (rgba32[i] & srcMask) | (dest32[i] & dstMask); + } + +#else + + const GLint rMask = ctx->Color.ColorMask[RCOMP]; + const GLint gMask = ctx->Color.ColorMask[GCOMP]; + const GLint bMask = ctx->Color.ColorMask[BCOMP]; + const GLint aMask = ctx->Color.ColorMask[ACOMP]; + + (*ctx->Driver.ReadRGBAPixels)( ctx, n, x, y, dest, mask ); + if (ctx->RasterMask & ALPHABUF_BIT) { + _mesa_read_alpha_pixels( ctx, n, x, y, dest, mask ); + } + + for (i = 0; i < n; i++) { + if (!rMask) rgba[i][RCOMP] = dest[i][RCOMP]; + if (!gMask) rgba[i][GCOMP] = dest[i][GCOMP]; + if (!bMask) rgba[i][BCOMP] = dest[i][BCOMP]; + if (!aMask) rgba[i][ACOMP] = dest[i][ACOMP]; + } + +#endif +} + + + +/* + * Apply glIndexMask to a span of CI pixels. + */ +void +_mesa_mask_index_span( GLcontext *ctx, + GLuint n, GLint x, GLint y, GLuint index[] ) +{ + GLuint i; + GLuint fbindexes[MAX_WIDTH]; + GLuint msrc, mdest; + + gl_read_index_span( ctx, ctx->DrawBuffer, n, x, y, fbindexes ); + + msrc = ctx->Color.IndexMask; + mdest = ~msrc; + + for (i=0;i<n;i++) { + index[i] = (index[i] & msrc) | (fbindexes[i] & mdest); + } +} + + + +/* + * Apply glIndexMask to an array of CI pixels. + */ +void +_mesa_mask_index_pixels( GLcontext *ctx, + GLuint n, const GLint x[], const GLint y[], + GLuint index[], const GLubyte mask[] ) +{ + GLuint i; + GLuint fbindexes[PB_SIZE]; + GLuint msrc, mdest; + + (*ctx->Driver.ReadCI32Pixels)( 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); + } +} + |