1/* 2 * Mesa 3-D graphics library 3 * Version: 6.5 4 * 5 * Copyright (C) 1999-2006 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 * Authors: 25 * Brian Paul 26 * Keith Whitwell <keith@tungstengraphics.com> 27 */ 28 29/* 30 * Regarding GL_NV_texgen_reflection: 31 * 32 * Portions of this software may use or implement intellectual 33 * property owned and licensed by NVIDIA Corporation. NVIDIA disclaims 34 * any and all warranties with respect to such intellectual property, 35 * including any use thereof or modifications thereto. 36 */ 37 38#include "main/glheader.h" 39#include "main/colormac.h" 40#include "main/macros.h" 41#include "main/imports.h" 42#include "main/mtypes.h" 43 44#include "math/m_xform.h" 45 46#include "t_context.h" 47#include "t_pipeline.h" 48 49 50/*********************************************************************** 51 * Automatic texture coordinate generation (texgen) code. 52 */ 53 54 55struct texgen_stage_data; 56 57typedef void (*texgen_func)( struct gl_context *ctx, 58 struct texgen_stage_data *store, 59 GLuint unit); 60 61 62struct texgen_stage_data { 63 64 /* Per-texunit derived state. 65 */ 66 GLuint TexgenSize[MAX_TEXTURE_COORD_UNITS]; 67 texgen_func TexgenFunc[MAX_TEXTURE_COORD_UNITS]; 68 69 /* Temporary values used in texgen. 70 */ 71 GLfloat (*tmp_f)[3]; 72 GLfloat *tmp_m; 73 74 /* Buffered outputs of the stage. 75 */ 76 GLvector4f texcoord[MAX_TEXTURE_COORD_UNITS]; 77}; 78 79 80#define TEXGEN_STAGE_DATA(stage) ((struct texgen_stage_data *)stage->privatePtr) 81 82 83 84static GLuint all_bits[5] = { 85 0, 86 VEC_SIZE_1, 87 VEC_SIZE_2, 88 VEC_SIZE_3, 89 VEC_SIZE_4, 90}; 91 92#define VEC_SIZE_FLAGS (VEC_SIZE_1|VEC_SIZE_2|VEC_SIZE_3|VEC_SIZE_4) 93 94#define TEXGEN_NEED_M (TEXGEN_SPHERE_MAP) 95#define TEXGEN_NEED_F (TEXGEN_SPHERE_MAP | \ 96 TEXGEN_REFLECTION_MAP_NV) 97 98 99 100static void build_m3( GLfloat f[][3], GLfloat m[], 101 const GLvector4f *normal, 102 const GLvector4f *eye ) 103{ 104 GLuint stride = eye->stride; 105 GLfloat *coord = (GLfloat *)eye->start; 106 GLuint count = eye->count; 107 const GLfloat *norm = normal->start; 108 GLuint i; 109 110 for (i=0;i<count;i++,STRIDE_F(coord,stride),STRIDE_F(norm,normal->stride)) { 111 GLfloat u[3], two_nu, fx, fy, fz; 112 COPY_3V( u, coord ); 113 NORMALIZE_3FV( u ); 114 two_nu = 2.0F * DOT3(norm,u); 115 fx = f[i][0] = u[0] - norm[0] * two_nu; 116 fy = f[i][1] = u[1] - norm[1] * two_nu; 117 fz = f[i][2] = u[2] - norm[2] * two_nu; 118 m[i] = fx * fx + fy * fy + (fz + 1.0F) * (fz + 1.0F); 119 if (m[i] != 0.0F) { 120 m[i] = 0.5F * INV_SQRTF(m[i]); 121 } 122 } 123} 124 125 126 127static void build_m2( GLfloat f[][3], GLfloat m[], 128 const GLvector4f *normal, 129 const GLvector4f *eye ) 130{ 131 GLuint stride = eye->stride; 132 GLfloat *coord = eye->start; 133 GLuint count = eye->count; 134 135 GLfloat *norm = normal->start; 136 GLuint i; 137 138 for (i=0;i<count;i++,STRIDE_F(coord,stride),STRIDE_F(norm,normal->stride)) { 139 GLfloat u[3], two_nu, fx, fy, fz; 140 COPY_2V( u, coord ); 141 u[2] = 0; 142 NORMALIZE_3FV( u ); 143 two_nu = 2.0F * DOT3(norm,u); 144 fx = f[i][0] = u[0] - norm[0] * two_nu; 145 fy = f[i][1] = u[1] - norm[1] * two_nu; 146 fz = f[i][2] = u[2] - norm[2] * two_nu; 147 m[i] = fx * fx + fy * fy + (fz + 1.0F) * (fz + 1.0F); 148 if (m[i] != 0.0F) { 149 m[i] = 0.5F * INV_SQRTF(m[i]); 150 } 151 } 152} 153 154 155 156typedef void (*build_m_func)( GLfloat f[][3], 157 GLfloat m[], 158 const GLvector4f *normal, 159 const GLvector4f *eye ); 160 161 162static build_m_func build_m_tab[5] = { 163 NULL, 164 NULL, 165 build_m2, 166 build_m3, 167 build_m3 168}; 169 170 171/* This is unusual in that we respect the stride of the output vector 172 * (f). This allows us to pass in either a texcoord vector4f, or a 173 * temporary vector3f. 174 */ 175static void build_f3( GLfloat *f, 176 GLuint fstride, 177 const GLvector4f *normal, 178 const GLvector4f *eye ) 179{ 180 GLuint stride = eye->stride; 181 GLfloat *coord = eye->start; 182 GLuint count = eye->count; 183 184 GLfloat *norm = normal->start; 185 GLuint i; 186 187 for (i=0;i<count;i++) { 188 GLfloat u[3], two_nu; 189 COPY_3V( u, coord ); 190 NORMALIZE_3FV( u ); 191 two_nu = 2.0F * DOT3(norm,u); 192 f[0] = u[0] - norm[0] * two_nu; 193 f[1] = u[1] - norm[1] * two_nu; 194 f[2] = u[2] - norm[2] * two_nu; 195 STRIDE_F(coord,stride); 196 STRIDE_F(f,fstride); 197 STRIDE_F(norm, normal->stride); 198 } 199} 200 201 202static void build_f2( GLfloat *f, 203 GLuint fstride, 204 const GLvector4f *normal, 205 const GLvector4f *eye ) 206{ 207 GLuint stride = eye->stride; 208 GLfloat *coord = eye->start; 209 GLuint count = eye->count; 210 GLfloat *norm = normal->start; 211 GLuint i; 212 213 for (i=0;i<count;i++) { 214 215 GLfloat u[3], two_nu; 216 COPY_2V( u, coord ); 217 u[2] = 0; 218 NORMALIZE_3FV( u ); 219 two_nu = 2.0F * DOT3(norm,u); 220 f[0] = u[0] - norm[0] * two_nu; 221 f[1] = u[1] - norm[1] * two_nu; 222 f[2] = u[2] - norm[2] * two_nu; 223 224 STRIDE_F(coord,stride); 225 STRIDE_F(f,fstride); 226 STRIDE_F(norm, normal->stride); 227 } 228} 229 230typedef void (*build_f_func)( GLfloat *f, 231 GLuint fstride, 232 const GLvector4f *normal_vec, 233 const GLvector4f *eye ); 234 235 236 237/* Just treat 4-vectors as 3-vectors. 238 */ 239static build_f_func build_f_tab[5] = { 240 NULL, 241 NULL, 242 build_f2, 243 build_f3, 244 build_f3 245}; 246 247 248 249/* Special case texgen functions. 250 */ 251static void texgen_reflection_map_nv( struct gl_context *ctx, 252 struct texgen_stage_data *store, 253 GLuint unit ) 254{ 255 struct vertex_buffer *VB = &TNL_CONTEXT(ctx)->vb; 256 GLvector4f *in = VB->AttribPtr[VERT_ATTRIB_TEX0 + unit]; 257 GLvector4f *out = &store->texcoord[unit]; 258 259 build_f_tab[VB->EyePtr->size]( out->start, 260 out->stride, 261 VB->AttribPtr[_TNL_ATTRIB_NORMAL], 262 VB->EyePtr ); 263 264 out->flags |= (in->flags & VEC_SIZE_FLAGS) | VEC_SIZE_3; 265 out->count = VB->Count; 266 out->size = MAX2(in->size, 3); 267 if (in->size == 4) 268 _mesa_copy_tab[0x8]( out, in ); 269} 270 271 272 273static void texgen_normal_map_nv( struct gl_context *ctx, 274 struct texgen_stage_data *store, 275 GLuint unit ) 276{ 277 struct vertex_buffer *VB = &TNL_CONTEXT(ctx)->vb; 278 GLvector4f *in = VB->AttribPtr[VERT_ATTRIB_TEX0 + unit]; 279 GLvector4f *out = &store->texcoord[unit]; 280 GLvector4f *normal = VB->AttribPtr[_TNL_ATTRIB_NORMAL]; 281 GLfloat (*texcoord)[4] = (GLfloat (*)[4])out->start; 282 GLuint count = VB->Count; 283 GLuint i; 284 const GLfloat *norm = normal->start; 285 286 for (i=0;i<count;i++, STRIDE_F(norm, normal->stride)) { 287 texcoord[i][0] = norm[0]; 288 texcoord[i][1] = norm[1]; 289 texcoord[i][2] = norm[2]; 290 } 291 292 293 out->flags |= (in->flags & VEC_SIZE_FLAGS) | VEC_SIZE_3; 294 out->count = count; 295 out->size = MAX2(in->size, 3); 296 if (in->size == 4) 297 _mesa_copy_tab[0x8]( out, in ); 298} 299 300 301static void texgen_sphere_map( struct gl_context *ctx, 302 struct texgen_stage_data *store, 303 GLuint unit ) 304{ 305 struct vertex_buffer *VB = &TNL_CONTEXT(ctx)->vb; 306 GLvector4f *in = VB->AttribPtr[VERT_ATTRIB_TEX0 + unit]; 307 GLvector4f *out = &store->texcoord[unit]; 308 GLfloat (*texcoord)[4] = (GLfloat (*)[4]) out->start; 309 GLuint count = VB->Count; 310 GLuint i; 311 GLfloat (*f)[3] = store->tmp_f; 312 GLfloat *m = store->tmp_m; 313 314 (build_m_tab[VB->EyePtr->size])( store->tmp_f, 315 store->tmp_m, 316 VB->AttribPtr[_TNL_ATTRIB_NORMAL], 317 VB->EyePtr ); 318 319 out->size = MAX2(in->size,2); 320 321 for (i=0;i<count;i++) { 322 texcoord[i][0] = f[i][0] * m[i] + 0.5F; 323 texcoord[i][1] = f[i][1] * m[i] + 0.5F; 324 } 325 326 out->count = count; 327 out->flags |= (in->flags & VEC_SIZE_FLAGS) | VEC_SIZE_2; 328 if (in->size > 2) 329 _mesa_copy_tab[all_bits[in->size] & ~0x3]( out, in ); 330} 331 332 333 334static void texgen( struct gl_context *ctx, 335 struct texgen_stage_data *store, 336 GLuint unit ) 337{ 338 TNLcontext *tnl = TNL_CONTEXT(ctx); 339 struct vertex_buffer *VB = &tnl->vb; 340 GLvector4f *in = VB->AttribPtr[VERT_ATTRIB_TEX0 + unit]; 341 GLvector4f *out = &store->texcoord[unit]; 342 const struct gl_texture_unit *texUnit = &ctx->Texture.Unit[unit]; 343 const GLvector4f *obj = VB->AttribPtr[_TNL_ATTRIB_POS]; 344 const GLvector4f *eye = VB->EyePtr; 345 const GLvector4f *normal = VB->AttribPtr[_TNL_ATTRIB_NORMAL]; 346 const GLfloat *m = store->tmp_m; 347 const GLuint count = VB->Count; 348 GLfloat (*texcoord)[4] = (GLfloat (*)[4])out->data; 349 GLfloat (*f)[3] = store->tmp_f; 350 GLuint copy; 351 352 if (texUnit->_GenFlags & TEXGEN_NEED_M) { 353 build_m_tab[eye->size]( store->tmp_f, store->tmp_m, normal, eye ); 354 } else if (texUnit->_GenFlags & TEXGEN_NEED_F) { 355 build_f_tab[eye->size]( (GLfloat *)store->tmp_f, 3, normal, eye ); 356 } 357 358 359 out->size = MAX2(in->size, store->TexgenSize[unit]); 360 out->flags |= (in->flags & VEC_SIZE_FLAGS) | texUnit->TexGenEnabled; 361 out->count = count; 362 363 copy = (all_bits[in->size] & ~texUnit->TexGenEnabled); 364 if (copy) 365 _mesa_copy_tab[copy]( out, in ); 366 367 if (texUnit->TexGenEnabled & S_BIT) { 368 GLuint i; 369 switch (texUnit->GenS.Mode) { 370 case GL_OBJECT_LINEAR: 371 _mesa_dotprod_tab[obj->size]( (GLfloat *)out->data, 372 sizeof(out->data[0]), obj, 373 texUnit->GenS.ObjectPlane ); 374 break; 375 case GL_EYE_LINEAR: 376 _mesa_dotprod_tab[eye->size]( (GLfloat *)out->data, 377 sizeof(out->data[0]), eye, 378 texUnit->GenS.EyePlane ); 379 break; 380 case GL_SPHERE_MAP: 381 for (i = 0; i < count; i++) 382 texcoord[i][0] = f[i][0] * m[i] + 0.5F; 383 break; 384 case GL_REFLECTION_MAP_NV: 385 for (i=0;i<count;i++) 386 texcoord[i][0] = f[i][0]; 387 break; 388 case GL_NORMAL_MAP_NV: { 389 const GLfloat *norm = normal->start; 390 for (i=0;i<count;i++, STRIDE_F(norm, normal->stride)) { 391 texcoord[i][0] = norm[0]; 392 } 393 break; 394 } 395 default: 396 _mesa_problem(ctx, "Bad S texgen"); 397 } 398 } 399 400 if (texUnit->TexGenEnabled & T_BIT) { 401 GLuint i; 402 switch (texUnit->GenT.Mode) { 403 case GL_OBJECT_LINEAR: 404 _mesa_dotprod_tab[obj->size]( &(out->data[0][1]), 405 sizeof(out->data[0]), obj, 406 texUnit->GenT.ObjectPlane ); 407 break; 408 case GL_EYE_LINEAR: 409 _mesa_dotprod_tab[eye->size]( &(out->data[0][1]), 410 sizeof(out->data[0]), eye, 411 texUnit->GenT.EyePlane ); 412 break; 413 case GL_SPHERE_MAP: 414 for (i = 0; i < count; i++) 415 texcoord[i][1] = f[i][1] * m[i] + 0.5F; 416 break; 417 case GL_REFLECTION_MAP_NV: 418 for (i=0;i<count;i++) 419 texcoord[i][1] = f[i][1]; 420 break; 421 case GL_NORMAL_MAP_NV: { 422 const GLfloat *norm = normal->start; 423 for (i=0;i<count;i++, STRIDE_F(norm, normal->stride)) { 424 texcoord[i][1] = norm[1]; 425 } 426 break; 427 } 428 default: 429 _mesa_problem(ctx, "Bad T texgen"); 430 } 431 } 432 433 if (texUnit->TexGenEnabled & R_BIT) { 434 GLuint i; 435 switch (texUnit->GenR.Mode) { 436 case GL_OBJECT_LINEAR: 437 _mesa_dotprod_tab[obj->size]( &(out->data[0][2]), 438 sizeof(out->data[0]), obj, 439 texUnit->GenR.ObjectPlane ); 440 break; 441 case GL_EYE_LINEAR: 442 _mesa_dotprod_tab[eye->size]( &(out->data[0][2]), 443 sizeof(out->data[0]), eye, 444 texUnit->GenR.EyePlane ); 445 break; 446 case GL_REFLECTION_MAP_NV: 447 for (i=0;i<count;i++) 448 texcoord[i][2] = f[i][2]; 449 break; 450 case GL_NORMAL_MAP_NV: { 451 const GLfloat *norm = normal->start; 452 for (i=0;i<count;i++,STRIDE_F(norm, normal->stride)) { 453 texcoord[i][2] = norm[2]; 454 } 455 break; 456 } 457 default: 458 _mesa_problem(ctx, "Bad R texgen"); 459 } 460 } 461 462 if (texUnit->TexGenEnabled & Q_BIT) { 463 switch (texUnit->GenQ.Mode) { 464 case GL_OBJECT_LINEAR: 465 _mesa_dotprod_tab[obj->size]( &(out->data[0][3]), 466 sizeof(out->data[0]), obj, 467 texUnit->GenQ.ObjectPlane ); 468 break; 469 case GL_EYE_LINEAR: 470 _mesa_dotprod_tab[eye->size]( &(out->data[0][3]), 471 sizeof(out->data[0]), eye, 472 texUnit->GenQ.EyePlane ); 473 break; 474 default: 475 _mesa_problem(ctx, "Bad Q texgen"); 476 } 477 } 478} 479 480 481 482 483static GLboolean run_texgen_stage( struct gl_context *ctx, 484 struct tnl_pipeline_stage *stage ) 485{ 486 struct vertex_buffer *VB = &TNL_CONTEXT(ctx)->vb; 487 struct texgen_stage_data *store = TEXGEN_STAGE_DATA(stage); 488 GLuint i; 489 490 if (!ctx->Texture._TexGenEnabled || ctx->VertexProgram._Current) 491 return GL_TRUE; 492 493 for (i = 0 ; i < ctx->Const.MaxTextureCoordUnits ; i++) { 494 struct gl_texture_unit *texUnit = &ctx->Texture.Unit[i]; 495 496 if (texUnit->TexGenEnabled) { 497 498 store->TexgenFunc[i]( ctx, store, i ); 499 500 VB->AttribPtr[VERT_ATTRIB_TEX0 + i] = &store->texcoord[i]; 501 } 502 } 503 504 return GL_TRUE; 505} 506 507 508static void validate_texgen_stage( struct gl_context *ctx, 509 struct tnl_pipeline_stage *stage ) 510{ 511 struct texgen_stage_data *store = TEXGEN_STAGE_DATA(stage); 512 GLuint i; 513 514 if (!ctx->Texture._TexGenEnabled || ctx->VertexProgram._Current) 515 return; 516 517 for (i = 0 ; i < ctx->Const.MaxTextureCoordUnits ; i++) { 518 struct gl_texture_unit *texUnit = &ctx->Texture.Unit[i]; 519 520 if (texUnit->TexGenEnabled) { 521 GLuint sz; 522 523 if (texUnit->TexGenEnabled & Q_BIT) 524 sz = 4; 525 else if (texUnit->TexGenEnabled & R_BIT) 526 sz = 3; 527 else if (texUnit->TexGenEnabled & T_BIT) 528 sz = 2; 529 else 530 sz = 1; 531 532 store->TexgenSize[i] = sz; 533 store->TexgenFunc[i] = texgen; /* general solution */ 534 535 /* look for special texgen cases */ 536 if (texUnit->TexGenEnabled == (S_BIT|T_BIT|R_BIT)) { 537 if (texUnit->_GenFlags == TEXGEN_REFLECTION_MAP_NV) { 538 store->TexgenFunc[i] = texgen_reflection_map_nv; 539 } 540 else if (texUnit->_GenFlags == TEXGEN_NORMAL_MAP_NV) { 541 store->TexgenFunc[i] = texgen_normal_map_nv; 542 } 543 } 544 else if (texUnit->TexGenEnabled == (S_BIT|T_BIT) && 545 texUnit->_GenFlags == TEXGEN_SPHERE_MAP) { 546 store->TexgenFunc[i] = texgen_sphere_map; 547 } 548 } 549 } 550} 551 552 553 554 555 556/* Called the first time stage->run() is invoked. 557 */ 558static GLboolean alloc_texgen_data( struct gl_context *ctx, 559 struct tnl_pipeline_stage *stage ) 560{ 561 struct vertex_buffer *VB = &TNL_CONTEXT(ctx)->vb; 562 struct texgen_stage_data *store; 563 GLuint i; 564 565 stage->privatePtr = CALLOC(sizeof(*store)); 566 store = TEXGEN_STAGE_DATA(stage); 567 if (!store) 568 return GL_FALSE; 569 570 for (i = 0 ; i < ctx->Const.MaxTextureCoordUnits ; i++) 571 _mesa_vector4f_alloc( &store->texcoord[i], 0, VB->Size, 32 ); 572 573 store->tmp_f = (GLfloat (*)[3]) MALLOC(VB->Size * sizeof(GLfloat) * 3); 574 store->tmp_m = (GLfloat *) MALLOC(VB->Size * sizeof(GLfloat)); 575 576 return GL_TRUE; 577} 578 579 580static void free_texgen_data( struct tnl_pipeline_stage *stage ) 581 582{ 583 struct texgen_stage_data *store = TEXGEN_STAGE_DATA(stage); 584 GLuint i; 585 586 if (store) { 587 for (i = 0 ; i < MAX_TEXTURE_COORD_UNITS ; i++) 588 if (store->texcoord[i].data) 589 _mesa_vector4f_free( &store->texcoord[i] ); 590 591 592 if (store->tmp_f) FREE( store->tmp_f ); 593 if (store->tmp_m) FREE( store->tmp_m ); 594 FREE( store ); 595 stage->privatePtr = NULL; 596 } 597} 598 599 600 601const struct tnl_pipeline_stage _tnl_texgen_stage = 602{ 603 "texgen", /* name */ 604 NULL, /* private data */ 605 alloc_texgen_data, /* destructor */ 606 free_texgen_data, /* destructor */ 607 validate_texgen_stage, /* check */ 608 run_texgen_stage /* run -- initially set to alloc data */ 609}; 610