t_vb_program.c revision de2afd8688ceb45013d15be7c6e0995199b80e5a
1/* 2 * Mesa 3-D graphics library 3 * Version: 7.1 4 * 5 * Copyright (C) 1999-2007 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 * \file tnl/t_vb_program.c 28 * \brief Pipeline stage for executing vertex programs. 29 * \author Brian Paul, Keith Whitwell 30 */ 31 32 33#include "main/glheader.h" 34#include "main/colormac.h" 35#include "main/context.h" 36#include "main/macros.h" 37#include "main/imports.h" 38#include "shader/prog_instruction.h" 39#include "shader/prog_statevars.h" 40#include "shader/prog_execute.h" 41#include "swrast/s_context.h" 42#include "swrast/s_texfilter.h" 43 44#include "tnl/tnl.h" 45#include "tnl/t_context.h" 46#include "tnl/t_pipeline.h" 47 48 49 50/*! 51 * Private storage for the vertex program pipeline stage. 52 */ 53struct vp_stage_data { 54 /** The results of running the vertex program go into these arrays. */ 55 GLvector4f results[VERT_RESULT_MAX]; 56 57 GLvector4f ndcCoords; /**< normalized device coords */ 58 GLubyte *clipmask; /**< clip flags */ 59 GLubyte ormask, andmask; /**< for clipping */ 60}; 61 62 63#define VP_STAGE_DATA(stage) ((struct vp_stage_data *)(stage->privatePtr)) 64 65 66static void 67userclip( GLcontext *ctx, 68 GLvector4f *clip, 69 GLubyte *clipmask, 70 GLubyte *clipormask, 71 GLubyte *clipandmask ) 72{ 73 GLuint p; 74 75 for (p = 0; p < ctx->Const.MaxClipPlanes; p++) { 76 if (ctx->Transform.ClipPlanesEnabled & (1 << p)) { 77 GLuint nr, i; 78 const GLfloat a = ctx->Transform._ClipUserPlane[p][0]; 79 const GLfloat b = ctx->Transform._ClipUserPlane[p][1]; 80 const GLfloat c = ctx->Transform._ClipUserPlane[p][2]; 81 const GLfloat d = ctx->Transform._ClipUserPlane[p][3]; 82 GLfloat *coord = (GLfloat *)clip->data; 83 GLuint stride = clip->stride; 84 GLuint count = clip->count; 85 86 for (nr = 0, i = 0 ; i < count ; i++) { 87 GLfloat dp = (coord[0] * a + 88 coord[1] * b + 89 coord[2] * c + 90 coord[3] * d); 91 92 if (dp < 0) { 93 nr++; 94 clipmask[i] |= CLIP_USER_BIT; 95 } 96 97 STRIDE_F(coord, stride); 98 } 99 100 if (nr > 0) { 101 *clipormask |= CLIP_USER_BIT; 102 if (nr == count) { 103 *clipandmask |= CLIP_USER_BIT; 104 return; 105 } 106 } 107 } 108 } 109} 110 111 112static GLboolean 113do_ndc_cliptest(GLcontext *ctx, struct vp_stage_data *store) 114{ 115 TNLcontext *tnl = TNL_CONTEXT(ctx); 116 struct vertex_buffer *VB = &tnl->vb; 117 /* Cliptest and perspective divide. Clip functions must clear 118 * the clipmask. 119 */ 120 store->ormask = 0; 121 store->andmask = CLIP_FRUSTUM_BITS; 122 123 if (tnl->NeedNdcCoords) { 124 VB->NdcPtr = 125 _mesa_clip_tab[VB->ClipPtr->size]( VB->ClipPtr, 126 &store->ndcCoords, 127 store->clipmask, 128 &store->ormask, 129 &store->andmask ); 130 } 131 else { 132 VB->NdcPtr = NULL; 133 _mesa_clip_np_tab[VB->ClipPtr->size]( VB->ClipPtr, 134 NULL, 135 store->clipmask, 136 &store->ormask, 137 &store->andmask ); 138 } 139 140 if (store->andmask) { 141 /* All vertices are outside the frustum */ 142 return GL_FALSE; 143 } 144 145 /* Test userclip planes. This contributes to VB->ClipMask. 146 */ 147 /** XXX NEW_SLANG _Enabled ??? */ 148 if (ctx->Transform.ClipPlanesEnabled && (!ctx->VertexProgram._Enabled || 149 ctx->VertexProgram.Current->IsPositionInvariant)) { 150 userclip( ctx, 151 VB->ClipPtr, 152 store->clipmask, 153 &store->ormask, 154 &store->andmask ); 155 156 if (store->andmask) { 157 return GL_FALSE; 158 } 159 } 160 161 VB->ClipAndMask = store->andmask; 162 VB->ClipOrMask = store->ormask; 163 VB->ClipMask = store->clipmask; 164 165 return GL_TRUE; 166} 167 168 169/** 170 * XXX the texture sampling code in this module is a bit of a hack. 171 * The texture sampling code is in swrast, though it doesn't have any 172 * real dependencies on the rest of swrast. It should probably be 173 * moved into main/ someday. 174 */ 175static void 176vp_fetch_texel(GLcontext *ctx, const GLfloat texcoord[4], GLfloat lambda, 177 GLuint unit, GLfloat color[4]) 178{ 179 SWcontext *swrast = SWRAST_CONTEXT(ctx); 180 181 /* XXX use a float-valued TextureSample routine here!!! */ 182 swrast->TextureSample[unit](ctx, ctx->Texture.Unit[unit]._Current, 183 1, (const GLfloat (*)[4]) texcoord, 184 &lambda, (GLfloat (*)[4]) color); 185} 186 187 188/** 189 * Called via ctx->Driver.ProgramStringNotify() after a new vertex program 190 * string has been parsed. 191 */ 192void 193_tnl_program_string(GLcontext *ctx, GLenum target, struct gl_program *program) 194{ 195 /* No-op. 196 * If we had derived anything from the program that was private to this 197 * stage we'd recompute/validate it here. 198 */ 199} 200 201 202/** 203 * Initialize virtual machine state prior to executing vertex program. 204 */ 205static void 206init_machine(GLcontext *ctx, struct gl_program_machine *machine) 207{ 208 /* Input registers get initialized from the current vertex attribs */ 209 MEMCPY(machine->VertAttribs, ctx->Current.Attrib, 210 MAX_VERTEX_PROGRAM_ATTRIBS * 4 * sizeof(GLfloat)); 211 212 if (ctx->VertexProgram._Current->IsNVProgram) { 213 GLuint i; 214 /* Output/result regs are initialized to [0,0,0,1] */ 215 for (i = 0; i < MAX_NV_VERTEX_PROGRAM_OUTPUTS; i++) { 216 ASSIGN_4V(machine->Outputs[i], 0.0F, 0.0F, 0.0F, 1.0F); 217 } 218 /* Temp regs are initialized to [0,0,0,0] */ 219 for (i = 0; i < MAX_NV_VERTEX_PROGRAM_TEMPS; i++) { 220 ASSIGN_4V(machine->Temporaries[i], 0.0F, 0.0F, 0.0F, 0.0F); 221 } 222 for (i = 0; i < MAX_VERTEX_PROGRAM_ADDRESS_REGS; i++) { 223 ASSIGN_4V(machine->AddressReg[i], 0, 0, 0, 0); 224 } 225 } 226 227 machine->NumDeriv = 0; 228 229 /* init condition codes */ 230 machine->CondCodes[0] = COND_EQ; 231 machine->CondCodes[1] = COND_EQ; 232 machine->CondCodes[2] = COND_EQ; 233 machine->CondCodes[3] = COND_EQ; 234 235 /* init call stack */ 236 machine->StackDepth = 0; 237 238 machine->FetchTexelLod = vp_fetch_texel; 239 machine->FetchTexelDeriv = NULL; /* not used by vertex programs */ 240 241 machine->Samplers = ctx->VertexProgram._Current->Base.SamplerUnits; 242} 243 244 245/** 246 * Map the texture images which the vertex program will access (if any). 247 */ 248static void 249map_textures(GLcontext *ctx, const struct gl_vertex_program *vp) 250{ 251 GLuint u; 252 253 if (!ctx->Driver.MapTexture) 254 return; 255 256 for (u = 0; u < ctx->Const.MaxVertexTextureImageUnits; u++) { 257 if (vp->Base.TexturesUsed[u]) { 258 /* Note: _Current *should* correspond to the target indicated 259 * in TexturesUsed[u]. 260 */ 261 ctx->Driver.MapTexture(ctx, ctx->Texture.Unit[u]._Current); 262 } 263 } 264} 265 266 267/** 268 * Unmap the texture images which were used by the vertex program (if any). 269 */ 270static void 271unmap_textures(GLcontext *ctx, const struct gl_vertex_program *vp) 272{ 273 GLuint u; 274 275 if (!ctx->Driver.MapTexture) 276 return; 277 278 for (u = 0; u < ctx->Const.MaxVertexTextureImageUnits; u++) { 279 if (vp->Base.TexturesUsed[u]) { 280 /* Note: _Current *should* correspond to the target indicated 281 * in TexturesUsed[u]. 282 */ 283 ctx->Driver.UnmapTexture(ctx, ctx->Texture.Unit[u]._Current); 284 } 285 } 286} 287 288 289/** 290 * This function executes vertex programs 291 */ 292static GLboolean 293run_vp( GLcontext *ctx, struct tnl_pipeline_stage *stage ) 294{ 295 TNLcontext *tnl = TNL_CONTEXT(ctx); 296 struct vp_stage_data *store = VP_STAGE_DATA(stage); 297 struct vertex_buffer *VB = &tnl->vb; 298 struct gl_vertex_program *program = ctx->VertexProgram._Current; 299 struct gl_program_machine machine; 300 GLuint outputs[VERT_RESULT_MAX], numOutputs; 301 GLuint i, j; 302 303 if (!program) 304 return GL_TRUE; 305 306 if (program->IsNVProgram) { 307 _mesa_load_tracked_matrices(ctx); 308 } 309 else { 310 /* ARB program or vertex shader */ 311 _mesa_load_state_parameters(ctx, program->Base.Parameters); 312 } 313 314 /* make list of outputs to save some time below */ 315 numOutputs = 0; 316 for (i = 0; i < VERT_RESULT_MAX; i++) { 317 if (program->Base.OutputsWritten & (1 << i)) { 318 outputs[numOutputs++] = i; 319 } 320 } 321 322 map_textures(ctx, program); 323 324 for (i = 0; i < VB->Count; i++) { 325 GLuint attr; 326 327 init_machine(ctx, &machine); 328 329#if 0 330 printf("Input %d: %f, %f, %f, %f\n", i, 331 VB->AttribPtr[0]->data[i][0], 332 VB->AttribPtr[0]->data[i][1], 333 VB->AttribPtr[0]->data[i][2], 334 VB->AttribPtr[0]->data[i][3]); 335 printf(" color: %f, %f, %f, %f\n", 336 VB->AttribPtr[3]->data[i][0], 337 VB->AttribPtr[3]->data[i][1], 338 VB->AttribPtr[3]->data[i][2], 339 VB->AttribPtr[3]->data[i][3]); 340 printf(" normal: %f, %f, %f, %f\n", 341 VB->AttribPtr[2]->data[i][0], 342 VB->AttribPtr[2]->data[i][1], 343 VB->AttribPtr[2]->data[i][2], 344 VB->AttribPtr[2]->data[i][3]); 345#endif 346 347 /* the vertex array case */ 348 for (attr = 0; attr < VERT_ATTRIB_MAX; attr++) { 349 if (program->Base.InputsRead & (1 << attr)) { 350 const GLubyte *ptr = (const GLubyte*) VB->AttribPtr[attr]->data; 351 const GLuint size = VB->AttribPtr[attr]->size; 352 const GLuint stride = VB->AttribPtr[attr]->stride; 353 const GLfloat *data = (GLfloat *) (ptr + stride * i); 354 COPY_CLEAN_4V(machine.VertAttribs[attr], size, data); 355 } 356 } 357 358 /* execute the program */ 359 _mesa_execute_program(ctx, &program->Base, &machine); 360 361 /* copy the output registers into the VB->attribs arrays */ 362 for (j = 0; j < numOutputs; j++) { 363 const GLuint attr = outputs[j]; 364 COPY_4V(store->results[attr].data[i], machine.Outputs[attr]); 365 } 366#if 0 367 printf("HPOS: %f %f %f %f\n", 368 machine.Outputs[0][0], 369 machine.Outputs[0][1], 370 machine.Outputs[0][2], 371 machine.Outputs[0][3]); 372#endif 373 } 374 375 unmap_textures(ctx, program); 376 377 /* Fixup fog and point size results if needed */ 378 if (program->IsNVProgram) { 379 if (ctx->Fog.Enabled && 380 (program->Base.OutputsWritten & (1 << VERT_RESULT_FOGC)) == 0) { 381 for (i = 0; i < VB->Count; i++) { 382 store->results[VERT_RESULT_FOGC].data[i][0] = 1.0; 383 } 384 } 385 386 if (ctx->VertexProgram.PointSizeEnabled && 387 (program->Base.OutputsWritten & (1 << VERT_RESULT_PSIZ)) == 0) { 388 for (i = 0; i < VB->Count; i++) { 389 store->results[VERT_RESULT_PSIZ].data[i][0] = ctx->Point.Size; 390 } 391 } 392 } 393 394 if (program->IsPositionInvariant) { 395 /* We need the exact same transform as in the fixed function path here 396 * to guarantee invariance, depending on compiler optimization flags 397 * results could be different otherwise. 398 */ 399 VB->ClipPtr = TransformRaw( &store->results[0], 400 &ctx->_ModelProjectMatrix, 401 VB->AttribPtr[0] ); 402 403 /* Drivers expect this to be clean to element 4... 404 */ 405 switch (VB->ClipPtr->size) { 406 case 1: 407 /* impossible */ 408 case 2: 409 _mesa_vector4f_clean_elem( VB->ClipPtr, VB->Count, 2 ); 410 /* fall-through */ 411 case 3: 412 _mesa_vector4f_clean_elem( VB->ClipPtr, VB->Count, 3 ); 413 /* fall-through */ 414 case 4: 415 break; 416 } 417 } 418 else { 419 /* Setup the VB pointers so that the next pipeline stages get 420 * their data from the right place (the program output arrays). 421 */ 422 VB->ClipPtr = &store->results[VERT_RESULT_HPOS]; 423 VB->ClipPtr->size = 4; 424 VB->ClipPtr->count = VB->Count; 425 } 426 427 VB->ColorPtr[0] = &store->results[VERT_RESULT_COL0]; 428 VB->ColorPtr[1] = &store->results[VERT_RESULT_BFC0]; 429 VB->SecondaryColorPtr[0] = &store->results[VERT_RESULT_COL1]; 430 VB->SecondaryColorPtr[1] = &store->results[VERT_RESULT_BFC1]; 431 VB->FogCoordPtr = &store->results[VERT_RESULT_FOGC]; 432 433 VB->AttribPtr[VERT_ATTRIB_COLOR0] = &store->results[VERT_RESULT_COL0]; 434 VB->AttribPtr[VERT_ATTRIB_COLOR1] = &store->results[VERT_RESULT_COL1]; 435 VB->AttribPtr[VERT_ATTRIB_FOG] = &store->results[VERT_RESULT_FOGC]; 436 VB->AttribPtr[_TNL_ATTRIB_POINTSIZE] = &store->results[VERT_RESULT_PSIZ]; 437 438 for (i = 0; i < ctx->Const.MaxTextureCoordUnits; i++) { 439 VB->TexCoordPtr[i] = 440 VB->AttribPtr[_TNL_ATTRIB_TEX0 + i] 441 = &store->results[VERT_RESULT_TEX0 + i]; 442 } 443 444 for (i = 0; i < ctx->Const.MaxVarying; i++) { 445 if (program->Base.OutputsWritten & (1 << (VERT_RESULT_VAR0 + i))) { 446 /* Note: varying results get put into the generic attributes */ 447 VB->AttribPtr[VERT_ATTRIB_GENERIC0+i] 448 = &store->results[VERT_RESULT_VAR0 + i]; 449 } 450 } 451 452 453 /* Perform NDC and cliptest operations: 454 */ 455 return do_ndc_cliptest(ctx, store); 456} 457 458 459/** 460 * Called the first time stage->run is called. In effect, don't 461 * allocate data until the first time the stage is run. 462 */ 463static GLboolean 464init_vp(GLcontext *ctx, struct tnl_pipeline_stage *stage) 465{ 466 TNLcontext *tnl = TNL_CONTEXT(ctx); 467 struct vertex_buffer *VB = &(tnl->vb); 468 struct vp_stage_data *store; 469 const GLuint size = VB->Size; 470 GLuint i; 471 472 stage->privatePtr = MALLOC(sizeof(*store)); 473 store = VP_STAGE_DATA(stage); 474 if (!store) 475 return GL_FALSE; 476 477 /* Allocate arrays of vertex output values */ 478 for (i = 0; i < VERT_RESULT_MAX; i++) { 479 _mesa_vector4f_alloc( &store->results[i], 0, size, 32 ); 480 store->results[i].size = 4; 481 } 482 483 /* a few other misc allocations */ 484 _mesa_vector4f_alloc( &store->ndcCoords, 0, size, 32 ); 485 store->clipmask = (GLubyte *) ALIGN_MALLOC(sizeof(GLubyte)*size, 32 ); 486 487 return GL_TRUE; 488} 489 490 491/** 492 * Destructor for this pipeline stage. 493 */ 494static void 495dtr(struct tnl_pipeline_stage *stage) 496{ 497 struct vp_stage_data *store = VP_STAGE_DATA(stage); 498 499 if (store) { 500 GLuint i; 501 502 /* free the vertex program result arrays */ 503 for (i = 0; i < VERT_RESULT_MAX; i++) 504 _mesa_vector4f_free( &store->results[i] ); 505 506 /* free misc arrays */ 507 _mesa_vector4f_free( &store->ndcCoords ); 508 ALIGN_FREE( store->clipmask ); 509 510 FREE( store ); 511 stage->privatePtr = NULL; 512 } 513} 514 515 516static void 517validate_vp_stage(GLcontext *ctx, struct tnl_pipeline_stage *stage) 518{ 519 if (ctx->VertexProgram._Current) { 520 _swrast_update_texture_samplers(ctx); 521 } 522} 523 524 525 526/** 527 * Public description of this pipeline stage. 528 */ 529const struct tnl_pipeline_stage _tnl_vertex_program_stage = 530{ 531 "vertex-program", 532 NULL, /* private_data */ 533 init_vp, /* create */ 534 dtr, /* destroy */ 535 validate_vp_stage, /* validate */ 536 run_vp /* run -- initially set to ctr */ 537}; 538