1 /* 2 * Mesa 3-D graphics library 3 * 4 * Copyright (C) 1999-2008 Brian Paul All Rights Reserved. 5 * Copyright (C) 2009 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 #include "main/glheader.h" 28 #include "main/context.h" 29 #include "main/imports.h" 30 #include "main/macros.h" 31 #include "main/pixeltransfer.h" 32 #include "main/samplerobj.h" 33 #include "program/prog_instruction.h" 34 35 #include "s_context.h" 36 #include "s_texcombine.h" 37 38 39 /** 40 * Pointer to array of float[4] 41 * This type makes the code below more concise and avoids a lot of casting. 42 */ 43 typedef float (*float4_array)[4]; 44 45 46 /** 47 * Return array of texels for given unit. 48 */ 49 static inline float4_array 50 get_texel_array(SWcontext *swrast, GLuint unit) 51 { 52 #ifdef _OPENMP 53 return (float4_array) (swrast->TexelBuffer + unit * SWRAST_MAX_WIDTH * 4 * omp_get_num_threads() + (SWRAST_MAX_WIDTH * 4 * omp_get_thread_num())); 54 #else 55 return (float4_array) (swrast->TexelBuffer + unit * SWRAST_MAX_WIDTH * 4); 56 #endif 57 } 58 59 60 61 /** 62 * Do texture application for: 63 * GL_EXT_texture_env_combine 64 * GL_ARB_texture_env_combine 65 * GL_EXT_texture_env_dot3 66 * GL_ARB_texture_env_dot3 67 * GL_ATI_texture_env_combine3 68 * GL_NV_texture_env_combine4 69 * conventional GL texture env modes 70 * 71 * \param ctx rendering context 72 * \param unit the texture combiner unit 73 * \param primary_rgba incoming fragment color array 74 * \param texelBuffer pointer to texel colors for all texture units 75 * 76 * \param span two fields are used in this function: 77 * span->end: number of fragments to process 78 * span->array->rgba: incoming/result fragment colors 79 */ 80 static void 81 texture_combine( struct gl_context *ctx, GLuint unit, 82 const float4_array primary_rgba, 83 const GLfloat *texelBuffer, 84 SWspan *span ) 85 { 86 SWcontext *swrast = SWRAST_CONTEXT(ctx); 87 const struct gl_texture_unit *textureUnit = &(ctx->Texture.Unit[unit]); 88 const struct gl_tex_env_combine_state *combine = textureUnit->_CurrentCombine; 89 float4_array argRGB[MAX_COMBINER_TERMS]; 90 float4_array argA[MAX_COMBINER_TERMS]; 91 const GLfloat scaleRGB = (GLfloat) (1 << combine->ScaleShiftRGB); 92 const GLfloat scaleA = (GLfloat) (1 << combine->ScaleShiftA); 93 const GLuint numArgsRGB = combine->_NumArgsRGB; 94 const GLuint numArgsA = combine->_NumArgsA; 95 float4_array ccolor[4], rgba; 96 GLuint i, term; 97 GLuint n = span->end; 98 GLchan (*rgbaChan)[4] = span->array->rgba; 99 100 /* alloc temp pixel buffers */ 101 rgba = malloc(4 * n * sizeof(GLfloat)); 102 if (!rgba) { 103 _mesa_error(ctx, GL_OUT_OF_MEMORY, "texture_combine"); 104 return; 105 } 106 107 for (i = 0; i < numArgsRGB || i < numArgsA; i++) { 108 ccolor[i] = malloc(4 * n * sizeof(GLfloat)); 109 if (!ccolor[i]) { 110 while (i) { 111 free(ccolor[i]); 112 i--; 113 } 114 _mesa_error(ctx, GL_OUT_OF_MEMORY, "texture_combine"); 115 free(rgba); 116 return; 117 } 118 } 119 120 for (i = 0; i < n; i++) { 121 rgba[i][RCOMP] = CHAN_TO_FLOAT(rgbaChan[i][RCOMP]); 122 rgba[i][GCOMP] = CHAN_TO_FLOAT(rgbaChan[i][GCOMP]); 123 rgba[i][BCOMP] = CHAN_TO_FLOAT(rgbaChan[i][BCOMP]); 124 rgba[i][ACOMP] = CHAN_TO_FLOAT(rgbaChan[i][ACOMP]); 125 } 126 127 /* 128 printf("modeRGB 0x%x modeA 0x%x srcRGB1 0x%x srcA1 0x%x srcRGB2 0x%x srcA2 0x%x\n", 129 combine->ModeRGB, 130 combine->ModeA, 131 combine->SourceRGB[0], 132 combine->SourceA[0], 133 combine->SourceRGB[1], 134 combine->SourceA[1]); 135 */ 136 137 /* 138 * Do operand setup for up to 4 operands. Loop over the terms. 139 */ 140 for (term = 0; term < numArgsRGB; term++) { 141 const GLenum srcRGB = combine->SourceRGB[term]; 142 const GLenum operandRGB = combine->OperandRGB[term]; 143 144 switch (srcRGB) { 145 case GL_TEXTURE: 146 argRGB[term] = get_texel_array(swrast, unit); 147 break; 148 case GL_PRIMARY_COLOR: 149 argRGB[term] = primary_rgba; 150 break; 151 case GL_PREVIOUS: 152 argRGB[term] = rgba; 153 break; 154 case GL_CONSTANT: 155 { 156 float4_array c = ccolor[term]; 157 GLfloat red = textureUnit->EnvColor[0]; 158 GLfloat green = textureUnit->EnvColor[1]; 159 GLfloat blue = textureUnit->EnvColor[2]; 160 GLfloat alpha = textureUnit->EnvColor[3]; 161 for (i = 0; i < n; i++) { 162 ASSIGN_4V(c[i], red, green, blue, alpha); 163 } 164 argRGB[term] = ccolor[term]; 165 } 166 break; 167 /* GL_ATI_texture_env_combine3 allows GL_ZERO & GL_ONE as sources. 168 */ 169 case GL_ZERO: 170 { 171 float4_array c = ccolor[term]; 172 for (i = 0; i < n; i++) { 173 ASSIGN_4V(c[i], 0.0F, 0.0F, 0.0F, 0.0F); 174 } 175 argRGB[term] = ccolor[term]; 176 } 177 break; 178 case GL_ONE: 179 { 180 float4_array c = ccolor[term]; 181 for (i = 0; i < n; i++) { 182 ASSIGN_4V(c[i], 1.0F, 1.0F, 1.0F, 1.0F); 183 } 184 argRGB[term] = ccolor[term]; 185 } 186 break; 187 default: 188 /* ARB_texture_env_crossbar source */ 189 { 190 const GLuint srcUnit = srcRGB - GL_TEXTURE0; 191 assert(srcUnit < ctx->Const.MaxTextureUnits); 192 if (!ctx->Texture.Unit[srcUnit]._Current) 193 goto end; 194 argRGB[term] = get_texel_array(swrast, srcUnit); 195 } 196 } 197 198 if (operandRGB != GL_SRC_COLOR) { 199 float4_array src = argRGB[term]; 200 float4_array dst = ccolor[term]; 201 202 /* point to new arg[term] storage */ 203 argRGB[term] = ccolor[term]; 204 205 switch (operandRGB) { 206 case GL_ONE_MINUS_SRC_COLOR: 207 for (i = 0; i < n; i++) { 208 dst[i][RCOMP] = 1.0F - src[i][RCOMP]; 209 dst[i][GCOMP] = 1.0F - src[i][GCOMP]; 210 dst[i][BCOMP] = 1.0F - src[i][BCOMP]; 211 } 212 break; 213 case GL_SRC_ALPHA: 214 for (i = 0; i < n; i++) { 215 dst[i][RCOMP] = 216 dst[i][GCOMP] = 217 dst[i][BCOMP] = src[i][ACOMP]; 218 } 219 break; 220 case GL_ONE_MINUS_SRC_ALPHA: 221 for (i = 0; i < n; i++) { 222 dst[i][RCOMP] = 223 dst[i][GCOMP] = 224 dst[i][BCOMP] = 1.0F - src[i][ACOMP]; 225 } 226 break; 227 default: 228 _mesa_problem(ctx, "Bad operandRGB"); 229 } 230 } 231 } 232 233 /* 234 * Set up the argA[term] pointers 235 */ 236 for (term = 0; term < numArgsA; term++) { 237 const GLenum srcA = combine->SourceA[term]; 238 const GLenum operandA = combine->OperandA[term]; 239 240 switch (srcA) { 241 case GL_TEXTURE: 242 argA[term] = get_texel_array(swrast, unit); 243 break; 244 case GL_PRIMARY_COLOR: 245 argA[term] = primary_rgba; 246 break; 247 case GL_PREVIOUS: 248 argA[term] = rgba; 249 break; 250 case GL_CONSTANT: 251 { 252 float4_array c = ccolor[term]; 253 GLfloat alpha = textureUnit->EnvColor[3]; 254 for (i = 0; i < n; i++) 255 c[i][ACOMP] = alpha; 256 argA[term] = ccolor[term]; 257 } 258 break; 259 /* GL_ATI_texture_env_combine3 allows GL_ZERO & GL_ONE as sources. 260 */ 261 case GL_ZERO: 262 { 263 float4_array c = ccolor[term]; 264 for (i = 0; i < n; i++) 265 c[i][ACOMP] = 0.0F; 266 argA[term] = ccolor[term]; 267 } 268 break; 269 case GL_ONE: 270 { 271 float4_array c = ccolor[term]; 272 for (i = 0; i < n; i++) 273 c[i][ACOMP] = 1.0F; 274 argA[term] = ccolor[term]; 275 } 276 break; 277 default: 278 /* ARB_texture_env_crossbar source */ 279 { 280 const GLuint srcUnit = srcA - GL_TEXTURE0; 281 assert(srcUnit < ctx->Const.MaxTextureUnits); 282 if (!ctx->Texture.Unit[srcUnit]._Current) 283 goto end; 284 argA[term] = get_texel_array(swrast, srcUnit); 285 } 286 } 287 288 if (operandA == GL_ONE_MINUS_SRC_ALPHA) { 289 float4_array src = argA[term]; 290 float4_array dst = ccolor[term]; 291 argA[term] = ccolor[term]; 292 for (i = 0; i < n; i++) { 293 dst[i][ACOMP] = 1.0F - src[i][ACOMP]; 294 } 295 } 296 } 297 298 /* RGB channel combine */ 299 { 300 float4_array arg0 = argRGB[0]; 301 float4_array arg1 = argRGB[1]; 302 float4_array arg2 = argRGB[2]; 303 float4_array arg3 = argRGB[3]; 304 305 switch (combine->ModeRGB) { 306 case GL_REPLACE: 307 for (i = 0; i < n; i++) { 308 rgba[i][RCOMP] = arg0[i][RCOMP] * scaleRGB; 309 rgba[i][GCOMP] = arg0[i][GCOMP] * scaleRGB; 310 rgba[i][BCOMP] = arg0[i][BCOMP] * scaleRGB; 311 } 312 break; 313 case GL_MODULATE: 314 for (i = 0; i < n; i++) { 315 rgba[i][RCOMP] = arg0[i][RCOMP] * arg1[i][RCOMP] * scaleRGB; 316 rgba[i][GCOMP] = arg0[i][GCOMP] * arg1[i][GCOMP] * scaleRGB; 317 rgba[i][BCOMP] = arg0[i][BCOMP] * arg1[i][BCOMP] * scaleRGB; 318 } 319 break; 320 case GL_ADD: 321 if (textureUnit->EnvMode == GL_COMBINE4_NV) { 322 /* (a * b) + (c * d) */ 323 for (i = 0; i < n; i++) { 324 rgba[i][RCOMP] = (arg0[i][RCOMP] * arg1[i][RCOMP] + 325 arg2[i][RCOMP] * arg3[i][RCOMP]) * scaleRGB; 326 rgba[i][GCOMP] = (arg0[i][GCOMP] * arg1[i][GCOMP] + 327 arg2[i][GCOMP] * arg3[i][GCOMP]) * scaleRGB; 328 rgba[i][BCOMP] = (arg0[i][BCOMP] * arg1[i][BCOMP] + 329 arg2[i][BCOMP] * arg3[i][BCOMP]) * scaleRGB; 330 } 331 } 332 else { 333 /* 2-term addition */ 334 for (i = 0; i < n; i++) { 335 rgba[i][RCOMP] = (arg0[i][RCOMP] + arg1[i][RCOMP]) * scaleRGB; 336 rgba[i][GCOMP] = (arg0[i][GCOMP] + arg1[i][GCOMP]) * scaleRGB; 337 rgba[i][BCOMP] = (arg0[i][BCOMP] + arg1[i][BCOMP]) * scaleRGB; 338 } 339 } 340 break; 341 case GL_ADD_SIGNED: 342 if (textureUnit->EnvMode == GL_COMBINE4_NV) { 343 /* (a * b) + (c * d) - 0.5 */ 344 for (i = 0; i < n; i++) { 345 rgba[i][RCOMP] = (arg0[i][RCOMP] * arg1[i][RCOMP] + 346 arg2[i][RCOMP] * arg3[i][RCOMP] - 0.5F) * scaleRGB; 347 rgba[i][GCOMP] = (arg0[i][GCOMP] * arg1[i][GCOMP] + 348 arg2[i][GCOMP] * arg3[i][GCOMP] - 0.5F) * scaleRGB; 349 rgba[i][BCOMP] = (arg0[i][BCOMP] * arg1[i][BCOMP] + 350 arg2[i][BCOMP] * arg3[i][BCOMP] - 0.5F) * scaleRGB; 351 } 352 } 353 else { 354 for (i = 0; i < n; i++) { 355 rgba[i][RCOMP] = (arg0[i][RCOMP] + arg1[i][RCOMP] - 0.5F) * scaleRGB; 356 rgba[i][GCOMP] = (arg0[i][GCOMP] + arg1[i][GCOMP] - 0.5F) * scaleRGB; 357 rgba[i][BCOMP] = (arg0[i][BCOMP] + arg1[i][BCOMP] - 0.5F) * scaleRGB; 358 } 359 } 360 break; 361 case GL_INTERPOLATE: 362 for (i = 0; i < n; i++) { 363 rgba[i][RCOMP] = (arg0[i][RCOMP] * arg2[i][RCOMP] + 364 arg1[i][RCOMP] * (1.0F - arg2[i][RCOMP])) * scaleRGB; 365 rgba[i][GCOMP] = (arg0[i][GCOMP] * arg2[i][GCOMP] + 366 arg1[i][GCOMP] * (1.0F - arg2[i][GCOMP])) * scaleRGB; 367 rgba[i][BCOMP] = (arg0[i][BCOMP] * arg2[i][BCOMP] + 368 arg1[i][BCOMP] * (1.0F - arg2[i][BCOMP])) * scaleRGB; 369 } 370 break; 371 case GL_SUBTRACT: 372 for (i = 0; i < n; i++) { 373 rgba[i][RCOMP] = (arg0[i][RCOMP] - arg1[i][RCOMP]) * scaleRGB; 374 rgba[i][GCOMP] = (arg0[i][GCOMP] - arg1[i][GCOMP]) * scaleRGB; 375 rgba[i][BCOMP] = (arg0[i][BCOMP] - arg1[i][BCOMP]) * scaleRGB; 376 } 377 break; 378 case GL_DOT3_RGB_EXT: 379 case GL_DOT3_RGBA_EXT: 380 /* Do not scale the result by 1 2 or 4 */ 381 for (i = 0; i < n; i++) { 382 GLfloat dot = ((arg0[i][RCOMP] - 0.5F) * (arg1[i][RCOMP] - 0.5F) + 383 (arg0[i][GCOMP] - 0.5F) * (arg1[i][GCOMP] - 0.5F) + 384 (arg0[i][BCOMP] - 0.5F) * (arg1[i][BCOMP] - 0.5F)) 385 * 4.0F; 386 dot = CLAMP(dot, 0.0F, 1.0F); 387 rgba[i][RCOMP] = rgba[i][GCOMP] = rgba[i][BCOMP] = dot; 388 } 389 break; 390 case GL_DOT3_RGB: 391 case GL_DOT3_RGBA: 392 /* DO scale the result by 1 2 or 4 */ 393 for (i = 0; i < n; i++) { 394 GLfloat dot = ((arg0[i][RCOMP] - 0.5F) * (arg1[i][RCOMP] - 0.5F) + 395 (arg0[i][GCOMP] - 0.5F) * (arg1[i][GCOMP] - 0.5F) + 396 (arg0[i][BCOMP] - 0.5F) * (arg1[i][BCOMP] - 0.5F)) 397 * 4.0F * scaleRGB; 398 dot = CLAMP(dot, 0.0F, 1.0F); 399 rgba[i][RCOMP] = rgba[i][GCOMP] = rgba[i][BCOMP] = dot; 400 } 401 break; 402 case GL_MODULATE_ADD_ATI: 403 for (i = 0; i < n; i++) { 404 rgba[i][RCOMP] = ((arg0[i][RCOMP] * arg2[i][RCOMP]) + 405 arg1[i][RCOMP]) * scaleRGB; 406 rgba[i][GCOMP] = ((arg0[i][GCOMP] * arg2[i][GCOMP]) + 407 arg1[i][GCOMP]) * scaleRGB; 408 rgba[i][BCOMP] = ((arg0[i][BCOMP] * arg2[i][BCOMP]) + 409 arg1[i][BCOMP]) * scaleRGB; 410 } 411 break; 412 case GL_MODULATE_SIGNED_ADD_ATI: 413 for (i = 0; i < n; i++) { 414 rgba[i][RCOMP] = ((arg0[i][RCOMP] * arg2[i][RCOMP]) + 415 arg1[i][RCOMP] - 0.5F) * scaleRGB; 416 rgba[i][GCOMP] = ((arg0[i][GCOMP] * arg2[i][GCOMP]) + 417 arg1[i][GCOMP] - 0.5F) * scaleRGB; 418 rgba[i][BCOMP] = ((arg0[i][BCOMP] * arg2[i][BCOMP]) + 419 arg1[i][BCOMP] - 0.5F) * scaleRGB; 420 } 421 break; 422 case GL_MODULATE_SUBTRACT_ATI: 423 for (i = 0; i < n; i++) { 424 rgba[i][RCOMP] = ((arg0[i][RCOMP] * arg2[i][RCOMP]) - 425 arg1[i][RCOMP]) * scaleRGB; 426 rgba[i][GCOMP] = ((arg0[i][GCOMP] * arg2[i][GCOMP]) - 427 arg1[i][GCOMP]) * scaleRGB; 428 rgba[i][BCOMP] = ((arg0[i][BCOMP] * arg2[i][BCOMP]) - 429 arg1[i][BCOMP]) * scaleRGB; 430 } 431 break; 432 default: 433 _mesa_problem(ctx, "invalid combine mode"); 434 } 435 } 436 437 /* Alpha channel combine */ 438 { 439 float4_array arg0 = argA[0]; 440 float4_array arg1 = argA[1]; 441 float4_array arg2 = argA[2]; 442 float4_array arg3 = argA[3]; 443 444 switch (combine->ModeA) { 445 case GL_REPLACE: 446 for (i = 0; i < n; i++) { 447 rgba[i][ACOMP] = arg0[i][ACOMP] * scaleA; 448 } 449 break; 450 case GL_MODULATE: 451 for (i = 0; i < n; i++) { 452 rgba[i][ACOMP] = arg0[i][ACOMP] * arg1[i][ACOMP] * scaleA; 453 } 454 break; 455 case GL_ADD: 456 if (textureUnit->EnvMode == GL_COMBINE4_NV) { 457 /* (a * b) + (c * d) */ 458 for (i = 0; i < n; i++) { 459 rgba[i][ACOMP] = (arg0[i][ACOMP] * arg1[i][ACOMP] + 460 arg2[i][ACOMP] * arg3[i][ACOMP]) * scaleA; 461 } 462 } 463 else { 464 /* two-term add */ 465 for (i = 0; i < n; i++) { 466 rgba[i][ACOMP] = (arg0[i][ACOMP] + arg1[i][ACOMP]) * scaleA; 467 } 468 } 469 break; 470 case GL_ADD_SIGNED: 471 if (textureUnit->EnvMode == GL_COMBINE4_NV) { 472 /* (a * b) + (c * d) - 0.5 */ 473 for (i = 0; i < n; i++) { 474 rgba[i][ACOMP] = (arg0[i][ACOMP] * arg1[i][ACOMP] + 475 arg2[i][ACOMP] * arg3[i][ACOMP] - 476 0.5F) * scaleA; 477 } 478 } 479 else { 480 /* a + b - 0.5 */ 481 for (i = 0; i < n; i++) { 482 rgba[i][ACOMP] = (arg0[i][ACOMP] + arg1[i][ACOMP] - 0.5F) * scaleA; 483 } 484 } 485 break; 486 case GL_INTERPOLATE: 487 for (i = 0; i < n; i++) { 488 rgba[i][ACOMP] = (arg0[i][ACOMP] * arg2[i][ACOMP] + 489 arg1[i][ACOMP] * (1.0F - arg2[i][ACOMP])) 490 * scaleA; 491 } 492 break; 493 case GL_SUBTRACT: 494 for (i = 0; i < n; i++) { 495 rgba[i][ACOMP] = (arg0[i][ACOMP] - arg1[i][ACOMP]) * scaleA; 496 } 497 break; 498 case GL_MODULATE_ADD_ATI: 499 for (i = 0; i < n; i++) { 500 rgba[i][ACOMP] = ((arg0[i][ACOMP] * arg2[i][ACOMP]) 501 + arg1[i][ACOMP]) * scaleA; 502 } 503 break; 504 case GL_MODULATE_SIGNED_ADD_ATI: 505 for (i = 0; i < n; i++) { 506 rgba[i][ACOMP] = ((arg0[i][ACOMP] * arg2[i][ACOMP]) + 507 arg1[i][ACOMP] - 0.5F) * scaleA; 508 } 509 break; 510 case GL_MODULATE_SUBTRACT_ATI: 511 for (i = 0; i < n; i++) { 512 rgba[i][ACOMP] = ((arg0[i][ACOMP] * arg2[i][ACOMP]) 513 - arg1[i][ACOMP]) * scaleA; 514 } 515 break; 516 default: 517 _mesa_problem(ctx, "invalid combine mode"); 518 } 519 } 520 521 /* Fix the alpha component for GL_DOT3_RGBA_EXT/ARB combining. 522 * This is kind of a kludge. It would have been better if the spec 523 * were written such that the GL_COMBINE_ALPHA value could be set to 524 * GL_DOT3. 525 */ 526 if (combine->ModeRGB == GL_DOT3_RGBA_EXT || 527 combine->ModeRGB == GL_DOT3_RGBA) { 528 for (i = 0; i < n; i++) { 529 rgba[i][ACOMP] = rgba[i][RCOMP]; 530 } 531 } 532 533 for (i = 0; i < n; i++) { 534 UNCLAMPED_FLOAT_TO_CHAN(rgbaChan[i][RCOMP], rgba[i][RCOMP]); 535 UNCLAMPED_FLOAT_TO_CHAN(rgbaChan[i][GCOMP], rgba[i][GCOMP]); 536 UNCLAMPED_FLOAT_TO_CHAN(rgbaChan[i][BCOMP], rgba[i][BCOMP]); 537 UNCLAMPED_FLOAT_TO_CHAN(rgbaChan[i][ACOMP], rgba[i][ACOMP]); 538 } 539 /* The span->array->rgba values are of CHAN type so set 540 * span->array->ChanType field accordingly. 541 */ 542 span->array->ChanType = CHAN_TYPE; 543 544 end: 545 for (i = 0; i < numArgsRGB || i < numArgsA; i++) { 546 free(ccolor[i]); 547 } 548 free(rgba); 549 } 550 551 552 /** 553 * Apply X/Y/Z/W/0/1 swizzle to an array of colors/texels. 554 * See GL_EXT_texture_swizzle. 555 */ 556 static void 557 swizzle_texels(GLuint swizzle, GLuint count, float4_array texels) 558 { 559 const GLuint swzR = GET_SWZ(swizzle, 0); 560 const GLuint swzG = GET_SWZ(swizzle, 1); 561 const GLuint swzB = GET_SWZ(swizzle, 2); 562 const GLuint swzA = GET_SWZ(swizzle, 3); 563 GLfloat vector[6]; 564 GLuint i; 565 566 vector[SWIZZLE_ZERO] = 0; 567 vector[SWIZZLE_ONE] = 1.0F; 568 569 for (i = 0; i < count; i++) { 570 vector[SWIZZLE_X] = texels[i][0]; 571 vector[SWIZZLE_Y] = texels[i][1]; 572 vector[SWIZZLE_Z] = texels[i][2]; 573 vector[SWIZZLE_W] = texels[i][3]; 574 texels[i][RCOMP] = vector[swzR]; 575 texels[i][GCOMP] = vector[swzG]; 576 texels[i][BCOMP] = vector[swzB]; 577 texels[i][ACOMP] = vector[swzA]; 578 } 579 } 580 581 582 /** 583 * Apply texture mapping to a span of fragments. 584 */ 585 void 586 _swrast_texture_span( struct gl_context *ctx, SWspan *span ) 587 { 588 SWcontext *swrast = SWRAST_CONTEXT(ctx); 589 float4_array primary_rgba; 590 GLuint unit; 591 592 if (!swrast->TexelBuffer) { 593 #ifdef _OPENMP 594 const GLint maxThreads = omp_get_max_threads(); 595 596 /* TexelBuffer memory allocation needs to be done in a critical section 597 * as this code runs in a parallel loop. 598 * When entering the section, first check if TexelBuffer has been 599 * initialized already by another thread while this thread was waiting. 600 */ 601 #pragma omp critical 602 if (!swrast->TexelBuffer) { 603 #else 604 const GLint maxThreads = 1; 605 #endif 606 607 /* TexelBuffer is also global and normally shared by all SWspan 608 * instances; when running with multiple threads, create one per 609 * thread. 610 */ 611 swrast->TexelBuffer = 612 malloc(ctx->Const.Program[MESA_SHADER_FRAGMENT].MaxTextureImageUnits * maxThreads * 613 SWRAST_MAX_WIDTH * 4 * sizeof(GLfloat)); 614 #ifdef _OPENMP 615 } /* critical section */ 616 #endif 617 618 if (!swrast->TexelBuffer) { 619 _mesa_error(ctx, GL_OUT_OF_MEMORY, "texture_combine"); 620 return; 621 } 622 } 623 624 primary_rgba = malloc(span->end * 4 * sizeof(GLfloat)); 625 626 if (!primary_rgba) { 627 _mesa_error(ctx, GL_OUT_OF_MEMORY, "texture_span"); 628 return; 629 } 630 631 assert(span->end <= SWRAST_MAX_WIDTH); 632 633 /* 634 * Save copy of the incoming fragment colors (the GL_PRIMARY_COLOR) 635 */ 636 if (swrast->_TextureCombinePrimary) { 637 GLuint i; 638 for (i = 0; i < span->end; i++) { 639 primary_rgba[i][RCOMP] = CHAN_TO_FLOAT(span->array->rgba[i][RCOMP]); 640 primary_rgba[i][GCOMP] = CHAN_TO_FLOAT(span->array->rgba[i][GCOMP]); 641 primary_rgba[i][BCOMP] = CHAN_TO_FLOAT(span->array->rgba[i][BCOMP]); 642 primary_rgba[i][ACOMP] = CHAN_TO_FLOAT(span->array->rgba[i][ACOMP]); 643 } 644 } 645 646 /* 647 * Must do all texture sampling before combining in order to 648 * accommodate GL_ARB_texture_env_crossbar. 649 */ 650 for (unit = 0; unit < ctx->Const.MaxTextureUnits; unit++) { 651 const struct gl_texture_unit *texUnit = &ctx->Texture.Unit[unit]; 652 if (texUnit->_Current) { 653 const GLfloat (*texcoords)[4] = (const GLfloat (*)[4]) 654 span->array->attribs[VARYING_SLOT_TEX0 + unit]; 655 const struct gl_texture_object *curObj = texUnit->_Current; 656 const struct gl_sampler_object *samp = _mesa_get_samplerobj(ctx, unit); 657 GLfloat *lambda = span->array->lambda[unit]; 658 float4_array texels = get_texel_array(swrast, unit); 659 660 /* adjust texture lod (lambda) */ 661 if (span->arrayMask & SPAN_LAMBDA) { 662 if (texUnit->LodBias + samp->LodBias != 0.0F) { 663 /* apply LOD bias, but don't clamp yet */ 664 const GLfloat bias = CLAMP(texUnit->LodBias + samp->LodBias, 665 -ctx->Const.MaxTextureLodBias, 666 ctx->Const.MaxTextureLodBias); 667 GLuint i; 668 for (i = 0; i < span->end; i++) { 669 lambda[i] += bias; 670 } 671 } 672 673 if (samp->MinLod != -1000.0F || 674 samp->MaxLod != 1000.0F) { 675 /* apply LOD clamping to lambda */ 676 const GLfloat min = samp->MinLod; 677 const GLfloat max = samp->MaxLod; 678 GLuint i; 679 for (i = 0; i < span->end; i++) { 680 GLfloat l = lambda[i]; 681 lambda[i] = CLAMP(l, min, max); 682 } 683 } 684 } 685 else if (samp->MaxAnisotropy > 1.0F && 686 samp->MinFilter == GL_LINEAR_MIPMAP_LINEAR) { 687 /* sample_lambda_2d_aniso is beeing used as texture_sample_func, 688 * it requires the current SWspan *span as an additional parameter. 689 * In order to keep the same function signature, the unused lambda 690 * parameter will be modified to actually contain the SWspan pointer. 691 * This is a Hack. To make it right, the texture_sample_func 692 * signature and all implementing functions need to be modified. 693 */ 694 /* "hide" SWspan struct; cast to (GLfloat *) to suppress warning */ 695 lambda = (GLfloat *)span; 696 } 697 698 /* Sample the texture (span->end = number of fragments) */ 699 swrast->TextureSample[unit]( ctx, samp, 700 ctx->Texture.Unit[unit]._Current, 701 span->end, texcoords, lambda, texels ); 702 703 /* GL_EXT_texture_swizzle */ 704 if (curObj->_Swizzle != SWIZZLE_NOOP) { 705 swizzle_texels(curObj->_Swizzle, span->end, texels); 706 } 707 } 708 } 709 710 /* 711 * OK, now apply the texture (aka texture combine/blend). 712 * We modify the span->color.rgba values. 713 */ 714 for (unit = 0; unit < ctx->Const.MaxTextureUnits; unit++) { 715 if (ctx->Texture.Unit[unit]._Current) 716 texture_combine(ctx, unit, primary_rgba, swrast->TexelBuffer, span); 717 } 718 719 free(primary_rgba); 720 } 721
