src/mesa/swrast/s_masking.c

   1 /*
   2  * Mesa 3-D graphics library
   3  * Version:  6.3
   4  *
   5  * Copyright (C) 1999-2005  Brian Paul   All Rights Reserved.
   6  *
   7  * Permission is hereby granted, free of charge, to any person obtaining a
   8  * copy of this software and associated documentation files (the "Software"),
   9  * to deal in the Software without restriction, including without limitation
  10  * the rights to use, copy, modify, merge, publish, distribute, sublicense,
  11  * and/or sell copies of the Software, and to permit persons to whom the
  12  * Software is furnished to do so, subject to the following conditions:
  13  *
  14  * The above copyright notice and this permission notice shall be included
  15  * in all copies or substantial portions of the Software.
  16  *
  17  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
  18  * OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
  19  * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
  20  * BRIAN PAUL BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN
  21  * AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
  22  * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
  23  */
  24
  25
  26 /*
  27  * Implement the effect of glColorMask and glIndexMask in software.
  28  */
  29
  30
  31 #include "glheader.h"
  32 #include "enums.h"
  33 #include "macros.h"
  34
  35 #include "s_context.h"
  36 #include "s_masking.h"
  37 #include "s_span.h"
  38
  39
  40
  41 void
  42 _swrast_mask_rgba_span(GLcontext *ctx, struct gl_renderbuffer *rb,
  43                        const struct sw_span *span, GLchan rgba[][4])
  44 {
  45    GLchan dest[MAX_WIDTH][4];
  46 #if CHAN_BITS == 8
  47    GLuint srcMask = *((GLuint*)ctx->Color.ColorMask);
  48    GLuint dstMask = ~srcMask;
  49    GLuint *rgba32 = (GLuint *) rgba;
  50    GLuint *dest32 = (GLuint *) dest;
  51 #else
  52    const GLboolean rMask = ctx->Color.ColorMask[RCOMP];
  53    const GLboolean gMask = ctx->Color.ColorMask[GCOMP];
  54    const GLboolean bMask = ctx->Color.ColorMask[BCOMP];
  55    const GLboolean aMask = ctx->Color.ColorMask[ACOMP];
  56 #endif
  57    const GLuint n = span->end;
  58    GLuint i;
  59
  60    ASSERT(n < MAX_WIDTH);
  61    ASSERT(span->arrayMask & SPAN_RGBA);
  62
  63    if (span->arrayMask & SPAN_XY) {
  64       rb->GetValues(ctx, rb, n, span->array->x, span->array->y, dest);
  65    }
  66    else {
  67       _swrast_read_rgba_span(ctx, rb, n, span->x, span->y, dest);
  68    }
  69
  70 #if CHAN_BITS == 8
  71    for (i = 0; i < n; i++) {
  72       rgba32[i] = (rgba32[i] & srcMask) | (dest32[i] & dstMask);
  73    }
  74 #else
  75    for (i = 0; i < n; i++) {
  76       if (!rMask)  rgba[i][RCOMP] = dest[i][RCOMP];
  77       if (!gMask)  rgba[i][GCOMP] = dest[i][GCOMP];
  78       if (!bMask)  rgba[i][BCOMP] = dest[i][BCOMP];
  79       if (!aMask)  rgba[i][ACOMP] = dest[i][ACOMP];
  80    }
  81 #endif
  82 }
  83
  84
  85 /*
  86  * Apply glColorMask to a span of RGBA pixels.
  87  */
  88 void
  89 _swrast_mask_rgba_array(GLcontext *ctx, struct gl_renderbuffer *rb,
  90                         GLuint n, GLint x, GLint y, GLchan rgba[][4])
  91 {
  92    GLchan dest[MAX_WIDTH][4];
  93    GLuint i;
  94
  95 #if CHAN_BITS == 8
  96
  97    GLuint srcMask = *((GLuint*)ctx->Color.ColorMask);
  98    GLuint dstMask = ~srcMask;
  99    GLuint *rgba32 = (GLuint *) rgba;
 100    GLuint *dest32 = (GLuint *) dest;
 101
 102    _swrast_read_rgba_span( ctx, rb, n, x, y, dest );
 103    for (i = 0; i < n; i++) {
 104       rgba32[i] = (rgba32[i] & srcMask) | (dest32[i] & dstMask);
 105    }
 106
 107 #else
 108
 109    const GLint rMask = ctx->Color.ColorMask[RCOMP];
 110    const GLint gMask = ctx->Color.ColorMask[GCOMP];
 111    const GLint bMask = ctx->Color.ColorMask[BCOMP];
 112    const GLint aMask = ctx->Color.ColorMask[ACOMP];
 113
 114    _swrast_read_rgba_span( ctx, rb, n, x, y, dest );
 115    for (i = 0; i < n; i++) {
 116       if (!rMask)  rgba[i][RCOMP] = dest[i][RCOMP];
 117       if (!gMask)  rgba[i][GCOMP] = dest[i][GCOMP];
 118       if (!bMask)  rgba[i][BCOMP] = dest[i][BCOMP];
 119       if (!aMask)  rgba[i][ACOMP] = dest[i][ACOMP];
 120    }
 121
 122 #endif
 123 }
 124
 125
 126
 127 void
 128 _swrast_mask_ci_span(GLcontext *ctx, struct gl_renderbuffer *rb,
 129                      const struct sw_span *span, GLuint index[])
 130 {
 131    const GLuint srcMask = ctx->Color.IndexMask;
 132    const GLuint dstMask = ~srcMask;
 133    GLuint dest[MAX_WIDTH];
 134    GLuint i;
 135
 136    ASSERT(span->arrayMask & SPAN_INDEX);
 137    ASSERT(span->end < MAX_WIDTH);
 138    ASSERT(rb->DataType == GL_UNSIGNED_INT);
 139
 140    if (span->arrayMask & SPAN_XY) {
 141       rb->GetValues(ctx, rb, span->end, span->array->x, span->array->y, dest);
 142    }
 143    else {
 144       _swrast_read_index_span(ctx, rb, span->end, span->x, span->y, dest);
 145    }
 146
 147    for (i = 0; i < span->end; i++) {
 148       index[i] = (index[i] & srcMask) | (dest[i] & dstMask);
 149    }
 150 }
 151
 152
 153 /*
 154  * Apply glIndexMask to an array of CI pixels.
 155  */
 156 void
 157 _swrast_mask_ci_array(GLcontext *ctx, struct gl_renderbuffer *rb,
 158                       GLuint n, GLint x, GLint y, GLuint index[])
 159 {
 160    const GLuint srcMask = ctx->Color.IndexMask;
 161    const GLuint dstMask = ~srcMask;
 162    GLuint dest[MAX_WIDTH];
 163    GLuint i;
 164
 165    _swrast_read_index_span(ctx, rb, n, x, y, dest);
 166
 167    for (i=0;i<n;i++) {
 168       index[i] = (index[i] & srcMask) | (dest[i] & dstMask);
 169    }
 170 }