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57 | pj | 1 | /* $Id: s_masking.c,v 1.1 2003-02-28 11:49:42 pj Exp $ */ |
2 | |||
3 | /* |
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4 | * Mesa 3-D graphics library |
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5 | * Version: 4.1 |
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6 | * |
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7 | * Copyright (C) 1999-2002 Brian Paul All Rights Reserved. |
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8 | * |
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9 | * Permission is hereby granted, free of charge, to any person obtaining a |
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10 | * copy of this software and associated documentation files (the "Software"), |
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11 | * to deal in the Software without restriction, including without limitation |
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12 | * the rights to use, copy, modify, merge, publish, distribute, sublicense, |
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13 | * and/or sell copies of the Software, and to permit persons to whom the |
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14 | * Software is furnished to do so, subject to the following conditions: |
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15 | * |
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16 | * The above copyright notice and this permission notice shall be included |
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17 | * in all copies or substantial portions of the Software. |
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18 | * |
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19 | * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS |
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20 | * OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, |
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21 | * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL |
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22 | * BRIAN PAUL BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN |
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23 | * AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN |
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24 | * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE. |
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25 | */ |
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26 | |||
27 | |||
28 | /* |
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29 | * Implement the effect of glColorMask and glIndexMask in software. |
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30 | */ |
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31 | |||
32 | |||
33 | #include "glheader.h" |
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34 | #include "enums.h" |
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35 | #include "macros.h" |
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36 | |||
37 | #include "s_alphabuf.h" |
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38 | #include "s_context.h" |
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39 | #include "s_masking.h" |
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40 | #include "s_span.h" |
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41 | |||
42 | |||
43 | |||
44 | void |
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45 | _mesa_mask_rgba_span( GLcontext *ctx, const struct sw_span *span, |
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46 | GLchan rgba[][4] ) |
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47 | { |
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48 | SWcontext *swrast = SWRAST_CONTEXT(ctx); |
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49 | GLchan dest[MAX_WIDTH][4]; |
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50 | #if CHAN_BITS == 8 |
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51 | GLuint srcMask = *((GLuint*)ctx->Color.ColorMask); |
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52 | GLuint dstMask = ~srcMask; |
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53 | GLuint *rgba32 = (GLuint *) rgba; |
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54 | GLuint *dest32 = (GLuint *) dest; |
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55 | #else |
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56 | const GLboolean rMask = ctx->Color.ColorMask[RCOMP]; |
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57 | const GLboolean gMask = ctx->Color.ColorMask[GCOMP]; |
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58 | const GLboolean bMask = ctx->Color.ColorMask[BCOMP]; |
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59 | const GLboolean aMask = ctx->Color.ColorMask[ACOMP]; |
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60 | #endif |
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61 | const GLuint n = span->end; |
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62 | GLuint i; |
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63 | |||
64 | ASSERT(n < MAX_WIDTH); |
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65 | ASSERT(span->arrayMask & SPAN_RGBA); |
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66 | |||
67 | if (span->arrayMask & SPAN_XY) { |
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68 | (*swrast->Driver.ReadRGBAPixels)(ctx, n, span->array->x, span->array->y, |
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69 | dest, span->array->mask); |
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70 | if (SWRAST_CONTEXT(ctx)->_RasterMask & ALPHABUF_BIT) { |
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71 | _mesa_read_alpha_pixels(ctx, n, span->array->x, span->array->y, |
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72 | dest, span->array->mask); |
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73 | } |
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74 | } |
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75 | else { |
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76 | _mesa_read_rgba_span(ctx, ctx->DrawBuffer, n, span->x, span->y, dest); |
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77 | } |
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78 | |||
79 | #if CHAN_BITS == 8 |
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80 | for (i = 0; i < n; i++) { |
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81 | rgba32[i] = (rgba32[i] & srcMask) | (dest32[i] & dstMask); |
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82 | } |
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83 | #else |
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84 | for (i = 0; i < n; i++) { |
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85 | if (!rMask) rgba[i][RCOMP] = dest[i][RCOMP]; |
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86 | if (!gMask) rgba[i][GCOMP] = dest[i][GCOMP]; |
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87 | if (!bMask) rgba[i][BCOMP] = dest[i][BCOMP]; |
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88 | if (!aMask) rgba[i][ACOMP] = dest[i][ACOMP]; |
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89 | } |
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90 | #endif |
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91 | } |
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92 | |||
93 | |||
94 | |||
95 | |||
96 | /* |
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97 | * Apply glColorMask to a span of RGBA pixels. |
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98 | */ |
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99 | void |
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100 | _mesa_mask_rgba_array( GLcontext *ctx, |
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101 | GLuint n, GLint x, GLint y, GLchan rgba[][4] ) |
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102 | { |
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103 | GLchan dest[MAX_WIDTH][4]; |
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104 | GLuint i; |
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105 | |||
106 | #if CHAN_BITS == 8 |
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107 | |||
108 | GLuint srcMask = *((GLuint*)ctx->Color.ColorMask); |
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109 | GLuint dstMask = ~srcMask; |
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110 | GLuint *rgba32 = (GLuint *) rgba; |
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111 | GLuint *dest32 = (GLuint *) dest; |
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112 | |||
113 | _mesa_read_rgba_span( ctx, ctx->DrawBuffer, n, x, y, dest ); |
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114 | for (i = 0; i < n; i++) { |
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115 | rgba32[i] = (rgba32[i] & srcMask) | (dest32[i] & dstMask); |
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116 | } |
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117 | |||
118 | #else |
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119 | |||
120 | const GLint rMask = ctx->Color.ColorMask[RCOMP]; |
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121 | const GLint gMask = ctx->Color.ColorMask[GCOMP]; |
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122 | const GLint bMask = ctx->Color.ColorMask[BCOMP]; |
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123 | const GLint aMask = ctx->Color.ColorMask[ACOMP]; |
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124 | |||
125 | _mesa_read_rgba_span( ctx, ctx->DrawBuffer, n, x, y, dest ); |
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126 | for (i = 0; i < n; i++) { |
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127 | if (!rMask) rgba[i][RCOMP] = dest[i][RCOMP]; |
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128 | if (!gMask) rgba[i][GCOMP] = dest[i][GCOMP]; |
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129 | if (!bMask) rgba[i][BCOMP] = dest[i][BCOMP]; |
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130 | if (!aMask) rgba[i][ACOMP] = dest[i][ACOMP]; |
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131 | } |
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132 | |||
133 | #endif |
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134 | } |
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135 | |||
136 | |||
137 | |||
138 | void |
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139 | _mesa_mask_index_span( GLcontext *ctx, const struct sw_span *span, |
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140 | GLuint index[] ) |
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141 | { |
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142 | SWcontext *swrast = SWRAST_CONTEXT(ctx); |
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143 | const GLuint msrc = ctx->Color.IndexMask; |
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144 | const GLuint mdest = ~msrc; |
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145 | GLuint fbindexes[MAX_WIDTH]; |
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146 | GLuint i; |
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147 | |||
148 | ASSERT(span->arrayMask & SPAN_INDEX); |
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149 | ASSERT(span->end < MAX_WIDTH); |
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150 | |||
151 | if (span->arrayMask & SPAN_XY) { |
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152 | |||
153 | (*swrast->Driver.ReadCI32Pixels)(ctx, span->end, span->array->x, |
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154 | span->array->y, fbindexes, |
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155 | span->array->mask); |
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156 | |||
157 | for (i = 0; i < span->end; i++) { |
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158 | index[i] = (index[i] & msrc) | (fbindexes[i] & mdest); |
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159 | } |
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160 | } |
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161 | else { |
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162 | _mesa_read_index_span(ctx, ctx->DrawBuffer, span->end, span->x, span->y, |
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163 | fbindexes ); |
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164 | |||
165 | for (i = 0; i < span->end; i++) { |
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166 | index[i] = (index[i] & msrc) | (fbindexes[i] & mdest); |
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167 | } |
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168 | } |
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169 | } |
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170 | |||
171 | |||
172 | |||
173 | /* |
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174 | * Apply glIndexMask to a span of CI pixels. |
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175 | */ |
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176 | void |
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177 | _mesa_mask_index_array( GLcontext *ctx, |
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178 | GLuint n, GLint x, GLint y, GLuint index[] ) |
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179 | { |
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180 | GLuint i; |
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181 | GLuint fbindexes[MAX_WIDTH]; |
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182 | GLuint msrc, mdest; |
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183 | |||
184 | _mesa_read_index_span( ctx, ctx->DrawBuffer, n, x, y, fbindexes ); |
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185 | |||
186 | msrc = ctx->Color.IndexMask; |
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187 | mdest = ~msrc; |
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188 | |||
189 | for (i=0;i<n;i++) { |
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190 | index[i] = (index[i] & msrc) | (fbindexes[i] & mdest); |
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191 | } |
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192 | } |