1 /* 2 * Mesa 3-D graphics library 3 * 4 * Copyright (C) 1999-2008 Brian Paul All Rights Reserved. 5 * Copyright (C) 2009-2010 VMware, Inc. 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 * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR 21 * OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, 22 * ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR 23 * OTHER DEALINGS IN THE SOFTWARE. 24 */ 25 26 27 /** 28 * \file pixeltransfer.c 29 * Pixel transfer operations (scale, bias, table lookups, etc) 30 */ 31 32 33 #include "glheader.h" 34 #include "macros.h" 35 #include "pixeltransfer.h" 36 #include "imports.h" 37 #include "mtypes.h" 38 #include "util/rounding.h" 39 40 41 /* 42 * Apply scale and bias factors to an array of RGBA pixels. 43 */ 44 void 45 _mesa_scale_and_bias_rgba(GLuint n, GLfloat rgba[][4], 46 GLfloat rScale, GLfloat gScale, 47 GLfloat bScale, GLfloat aScale, 48 GLfloat rBias, GLfloat gBias, 49 GLfloat bBias, GLfloat aBias) 50 { 51 if (rScale != 1.0F || rBias != 0.0F) { 52 GLuint i; 53 for (i = 0; i < n; i++) { 54 rgba[i][RCOMP] = rgba[i][RCOMP] * rScale + rBias; 55 } 56 } 57 if (gScale != 1.0F || gBias != 0.0F) { 58 GLuint i; 59 for (i = 0; i < n; i++) { 60 rgba[i][GCOMP] = rgba[i][GCOMP] * gScale + gBias; 61 } 62 } 63 if (bScale != 1.0F || bBias != 0.0F) { 64 GLuint i; 65 for (i = 0; i < n; i++) { 66 rgba[i][BCOMP] = rgba[i][BCOMP] * bScale + bBias; 67 } 68 } 69 if (aScale != 1.0F || aBias != 0.0F) { 70 GLuint i; 71 for (i = 0; i < n; i++) { 72 rgba[i][ACOMP] = rgba[i][ACOMP] * aScale + aBias; 73 } 74 } 75 } 76 77 78 /* 79 * Apply pixel mapping to an array of floating point RGBA pixels. 80 */ 81 void 82 _mesa_map_rgba( const struct gl_context *ctx, GLuint n, GLfloat rgba[][4] ) 83 { 84 const GLfloat rscale = (GLfloat) (ctx->PixelMaps.RtoR.Size - 1); 85 const GLfloat gscale = (GLfloat) (ctx->PixelMaps.GtoG.Size - 1); 86 const GLfloat bscale = (GLfloat) (ctx->PixelMaps.BtoB.Size - 1); 87 const GLfloat ascale = (GLfloat) (ctx->PixelMaps.AtoA.Size - 1); 88 const GLfloat *rMap = ctx->PixelMaps.RtoR.Map; 89 const GLfloat *gMap = ctx->PixelMaps.GtoG.Map; 90 const GLfloat *bMap = ctx->PixelMaps.BtoB.Map; 91 const GLfloat *aMap = ctx->PixelMaps.AtoA.Map; 92 GLuint i; 93 for (i=0;i<n;i++) { 94 GLfloat r = CLAMP(rgba[i][RCOMP], 0.0F, 1.0F); 95 GLfloat g = CLAMP(rgba[i][GCOMP], 0.0F, 1.0F); 96 GLfloat b = CLAMP(rgba[i][BCOMP], 0.0F, 1.0F); 97 GLfloat a = CLAMP(rgba[i][ACOMP], 0.0F, 1.0F); 98 rgba[i][RCOMP] = rMap[(int)_mesa_lroundevenf(r * rscale)]; 99 rgba[i][GCOMP] = gMap[(int)_mesa_lroundevenf(g * gscale)]; 100 rgba[i][BCOMP] = bMap[(int)_mesa_lroundevenf(b * bscale)]; 101 rgba[i][ACOMP] = aMap[(int)_mesa_lroundevenf(a * ascale)]; 102 } 103 } 104 105 /* 106 * Map color indexes to float rgba values. 107 */ 108 void 109 _mesa_map_ci_to_rgba( const struct gl_context *ctx, GLuint n, 110 const GLuint index[], GLfloat rgba[][4] ) 111 { 112 GLuint rmask = ctx->PixelMaps.ItoR.Size - 1; 113 GLuint gmask = ctx->PixelMaps.ItoG.Size - 1; 114 GLuint bmask = ctx->PixelMaps.ItoB.Size - 1; 115 GLuint amask = ctx->PixelMaps.ItoA.Size - 1; 116 const GLfloat *rMap = ctx->PixelMaps.ItoR.Map; 117 const GLfloat *gMap = ctx->PixelMaps.ItoG.Map; 118 const GLfloat *bMap = ctx->PixelMaps.ItoB.Map; 119 const GLfloat *aMap = ctx->PixelMaps.ItoA.Map; 120 GLuint i; 121 for (i=0;i<n;i++) { 122 rgba[i][RCOMP] = rMap[index[i] & rmask]; 123 rgba[i][GCOMP] = gMap[index[i] & gmask]; 124 rgba[i][BCOMP] = bMap[index[i] & bmask]; 125 rgba[i][ACOMP] = aMap[index[i] & amask]; 126 } 127 } 128 129 130 void 131 _mesa_scale_and_bias_depth(const struct gl_context *ctx, GLuint n, 132 GLfloat depthValues[]) 133 { 134 const GLfloat scale = ctx->Pixel.DepthScale; 135 const GLfloat bias = ctx->Pixel.DepthBias; 136 GLuint i; 137 for (i = 0; i < n; i++) { 138 GLfloat d = depthValues[i] * scale + bias; 139 depthValues[i] = CLAMP(d, 0.0F, 1.0F); 140 } 141 } 142 143 144 void 145 _mesa_scale_and_bias_depth_uint(const struct gl_context *ctx, GLuint n, 146 GLuint depthValues[]) 147 { 148 const GLdouble max = (double) 0xffffffff; 149 const GLdouble scale = ctx->Pixel.DepthScale; 150 const GLdouble bias = ctx->Pixel.DepthBias * max; 151 GLuint i; 152 for (i = 0; i < n; i++) { 153 GLdouble d = (GLdouble) depthValues[i] * scale + bias; 154 d = CLAMP(d, 0.0, max); 155 depthValues[i] = (GLuint) d; 156 } 157 } 158 159 /** 160 * Apply various pixel transfer operations to an array of RGBA pixels 161 * as indicated by the transferOps bitmask 162 */ 163 void 164 _mesa_apply_rgba_transfer_ops(struct gl_context *ctx, GLbitfield transferOps, 165 GLuint n, GLfloat rgba[][4]) 166 { 167 /* scale & bias */ 168 if (transferOps & IMAGE_SCALE_BIAS_BIT) { 169 _mesa_scale_and_bias_rgba(n, rgba, 170 ctx->Pixel.RedScale, ctx->Pixel.GreenScale, 171 ctx->Pixel.BlueScale, ctx->Pixel.AlphaScale, 172 ctx->Pixel.RedBias, ctx->Pixel.GreenBias, 173 ctx->Pixel.BlueBias, ctx->Pixel.AlphaBias); 174 } 175 /* color map lookup */ 176 if (transferOps & IMAGE_MAP_COLOR_BIT) { 177 _mesa_map_rgba( ctx, n, rgba ); 178 } 179 180 /* clamping to [0,1] */ 181 if (transferOps & IMAGE_CLAMP_BIT) { 182 GLuint i; 183 for (i = 0; i < n; i++) { 184 rgba[i][RCOMP] = CLAMP(rgba[i][RCOMP], 0.0F, 1.0F); 185 rgba[i][GCOMP] = CLAMP(rgba[i][GCOMP], 0.0F, 1.0F); 186 rgba[i][BCOMP] = CLAMP(rgba[i][BCOMP], 0.0F, 1.0F); 187 rgba[i][ACOMP] = CLAMP(rgba[i][ACOMP], 0.0F, 1.0F); 188 } 189 } 190 } 191 192 193 /* 194 * Apply color index shift and offset to an array of pixels. 195 */ 196 void 197 _mesa_shift_and_offset_ci(const struct gl_context *ctx, 198 GLuint n, GLuint indexes[]) 199 { 200 GLint shift = ctx->Pixel.IndexShift; 201 GLint offset = ctx->Pixel.IndexOffset; 202 GLuint i; 203 if (shift > 0) { 204 for (i=0;i<n;i++) { 205 indexes[i] = (indexes[i] << shift) + offset; 206 } 207 } 208 else if (shift < 0) { 209 shift = -shift; 210 for (i=0;i<n;i++) { 211 indexes[i] = (indexes[i] >> shift) + offset; 212 } 213 } 214 else { 215 for (i=0;i<n;i++) { 216 indexes[i] = indexes[i] + offset; 217 } 218 } 219 } 220 221 222 223 /** 224 * Apply color index shift, offset and table lookup to an array 225 * of color indexes; 226 */ 227 void 228 _mesa_apply_ci_transfer_ops(const struct gl_context *ctx, 229 GLbitfield transferOps, 230 GLuint n, GLuint indexes[]) 231 { 232 if (transferOps & IMAGE_SHIFT_OFFSET_BIT) { 233 _mesa_shift_and_offset_ci(ctx, n, indexes); 234 } 235 if (transferOps & IMAGE_MAP_COLOR_BIT) { 236 const GLuint mask = ctx->PixelMaps.ItoI.Size - 1; 237 GLuint i; 238 for (i = 0; i < n; i++) { 239 const GLuint j = indexes[i] & mask; 240 indexes[i] = _mesa_lroundevenf(ctx->PixelMaps.ItoI.Map[j]); 241 } 242 } 243 } 244 245 246 /** 247 * Apply stencil index shift, offset and table lookup to an array 248 * of stencil values. 249 */ 250 void 251 _mesa_apply_stencil_transfer_ops(const struct gl_context *ctx, GLuint n, 252 GLubyte stencil[]) 253 { 254 if (ctx->Pixel.IndexShift != 0 || ctx->Pixel.IndexOffset != 0) { 255 const GLint offset = ctx->Pixel.IndexOffset; 256 GLint shift = ctx->Pixel.IndexShift; 257 GLuint i; 258 if (shift > 0) { 259 for (i = 0; i < n; i++) { 260 stencil[i] = (stencil[i] << shift) + offset; 261 } 262 } 263 else if (shift < 0) { 264 shift = -shift; 265 for (i = 0; i < n; i++) { 266 stencil[i] = (stencil[i] >> shift) + offset; 267 } 268 } 269 else { 270 for (i = 0; i < n; i++) { 271 stencil[i] = stencil[i] + offset; 272 } 273 } 274 } 275 if (ctx->Pixel.MapStencilFlag) { 276 GLuint mask = ctx->PixelMaps.StoS.Size - 1; 277 GLuint i; 278 for (i = 0; i < n; i++) { 279 stencil[i] = (GLubyte) ctx->PixelMaps.StoS.Map[ stencil[i] & mask ]; 280 } 281 } 282 } 283