1 /************************************************************************** 2 * 3 * Copyright 2008 VMware, Inc. 4 * All Rights Reserved. 5 * 6 * Permission is hereby granted, free of charge, to any person obtaining a 7 * copy of this software and associated documentation files (the 8 * "Software"), to deal in the Software without restriction, including 9 * without limitation the rights to use, copy, modify, merge, publish, 10 * distribute, sub license, and/or sell copies of the Software, and to 11 * permit persons to whom the Software is furnished to do so, subject to 12 * the following conditions: 13 * 14 * The above copyright notice and this permission notice (including the 15 * next paragraph) shall be included in all copies or substantial portions 16 * of the Software. 17 * 18 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS 19 * OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF 20 * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT. 21 * IN NO EVENT SHALL VMWARE AND/OR ITS SUPPLIERS BE LIABLE FOR 22 * ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, 23 * TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE 24 * SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE. 25 * 26 **************************************************************************/ 27 28 /** 29 * AA point stage: AA points are converted to quads and rendered with a 30 * special fragment shader. Another approach would be to use a texture 31 * map image of a point, but experiments indicate the quality isn't nearly 32 * as good as this approach. 33 * 34 * Note: this looks a lot like draw_aaline.c but there's actually little 35 * if any code that can be shared. 36 * 37 * Authors: Brian Paul 38 */ 39 40 41 #include "pipe/p_context.h" 42 #include "pipe/p_defines.h" 43 #include "pipe/p_shader_tokens.h" 44 45 #include "tgsi/tgsi_transform.h" 46 #include "tgsi/tgsi_dump.h" 47 48 #include "util/u_math.h" 49 #include "util/u_memory.h" 50 51 #include "draw_context.h" 52 #include "draw_vs.h" 53 #include "draw_pipe.h" 54 55 56 /** Approx number of new tokens for instructions in aa_transform_inst() */ 57 #define NUM_NEW_TOKENS 200 58 59 60 /* 61 * Enabling NORMALIZE might give _slightly_ better results. 62 * Basically, it controls whether we compute distance as d=sqrt(x*x+y*y) or 63 * d=x*x+y*y. Since we're working with a unit circle, the later seems 64 * close enough and saves some costly instructions. 65 */ 66 #define NORMALIZE 0 67 68 69 /** 70 * Subclass of pipe_shader_state to carry extra fragment shader info. 71 */ 72 struct aapoint_fragment_shader 73 { 74 struct pipe_shader_state state; 75 void *driver_fs; /**< the regular shader */ 76 void *aapoint_fs; /**< the aa point-augmented shader */ 77 int generic_attrib; /**< The generic input attrib/texcoord we'll use */ 78 }; 79 80 81 /** 82 * Subclass of draw_stage 83 */ 84 struct aapoint_stage 85 { 86 struct draw_stage stage; 87 88 /** half of pipe_rasterizer_state::point_size */ 89 float radius; 90 91 /** vertex attrib slot containing point size */ 92 int psize_slot; 93 94 /** this is the vertex attrib slot for the new texcoords */ 95 uint tex_slot; 96 97 /** vertex attrib slot containing position */ 98 uint pos_slot; 99 100 /** Currently bound fragment shader */ 101 struct aapoint_fragment_shader *fs; 102 103 /* 104 * Driver interface/override functions 105 */ 106 void * (*driver_create_fs_state)(struct pipe_context *, 107 const struct pipe_shader_state *); 108 void (*driver_bind_fs_state)(struct pipe_context *, void *); 109 void (*driver_delete_fs_state)(struct pipe_context *, void *); 110 }; 111 112 113 114 /** 115 * Subclass of tgsi_transform_context, used for transforming the 116 * user's fragment shader to add the special AA instructions. 117 */ 118 struct aa_transform_context { 119 struct tgsi_transform_context base; 120 uint tempsUsed; /**< bitmask */ 121 int colorOutput; /**< which output is the primary color */ 122 int maxInput, maxGeneric; /**< max input index found */ 123 int tmp0, colorTemp; /**< temp registers */ 124 }; 125 126 127 /** 128 * TGSI declaration transform callback. 129 * Look for two free temp regs and available input reg for new texcoords. 130 */ 131 static void 132 aa_transform_decl(struct tgsi_transform_context *ctx, 133 struct tgsi_full_declaration *decl) 134 { 135 struct aa_transform_context *aactx = (struct aa_transform_context *) ctx; 136 137 if (decl->Declaration.File == TGSI_FILE_OUTPUT && 138 decl->Semantic.Name == TGSI_SEMANTIC_COLOR && 139 decl->Semantic.Index == 0) { 140 aactx->colorOutput = decl->Range.First; 141 } 142 else if (decl->Declaration.File == TGSI_FILE_INPUT) { 143 if ((int) decl->Range.Last > aactx->maxInput) 144 aactx->maxInput = decl->Range.Last; 145 if (decl->Semantic.Name == TGSI_SEMANTIC_GENERIC && 146 (int) decl->Semantic.Index > aactx->maxGeneric) { 147 aactx->maxGeneric = decl->Semantic.Index; 148 } 149 } 150 else if (decl->Declaration.File == TGSI_FILE_TEMPORARY) { 151 uint i; 152 for (i = decl->Range.First; 153 i <= decl->Range.Last; i++) { 154 aactx->tempsUsed |= (1 << i); 155 } 156 } 157 158 ctx->emit_declaration(ctx, decl); 159 } 160 161 162 /** 163 * TGSI transform callback. 164 * Insert new declarations and instructions before first instruction. 165 */ 166 static void 167 aa_transform_prolog(struct tgsi_transform_context *ctx) 168 { 169 /* emit our new declarations before the first instruction */ 170 struct aa_transform_context *aactx = (struct aa_transform_context *) ctx; 171 struct tgsi_full_instruction newInst; 172 const int texInput = aactx->maxInput + 1; 173 int tmp0; 174 uint i; 175 176 /* find two free temp regs */ 177 for (i = 0; i < 32; i++) { 178 if ((aactx->tempsUsed & (1 << i)) == 0) { 179 /* found a free temp */ 180 if (aactx->tmp0 < 0) 181 aactx->tmp0 = i; 182 else if (aactx->colorTemp < 0) 183 aactx->colorTemp = i; 184 else 185 break; 186 } 187 } 188 189 assert(aactx->colorTemp != aactx->tmp0); 190 191 tmp0 = aactx->tmp0; 192 193 /* declare new generic input/texcoord */ 194 tgsi_transform_input_decl(ctx, texInput, 195 TGSI_SEMANTIC_GENERIC, aactx->maxGeneric + 1, 196 TGSI_INTERPOLATE_LINEAR); 197 198 /* declare new temp regs */ 199 tgsi_transform_temp_decl(ctx, tmp0); 200 tgsi_transform_temp_decl(ctx, aactx->colorTemp); 201 202 /* 203 * Emit code to compute fragment coverage, kill if outside point radius 204 * 205 * Temp reg0 usage: 206 * t0.x = distance of fragment from center point 207 * t0.y = boolean, is t0.x > 1.0, also misc temp usage 208 * t0.z = temporary for computing 1/(1-k) value 209 * t0.w = final coverage value 210 */ 211 212 /* MUL t0.xy, tex, tex; # compute x^2, y^2 */ 213 tgsi_transform_op2_inst(ctx, TGSI_OPCODE_MUL, 214 TGSI_FILE_TEMPORARY, tmp0, TGSI_WRITEMASK_XY, 215 TGSI_FILE_INPUT, texInput, 216 TGSI_FILE_INPUT, texInput, false); 217 218 /* ADD t0.x, t0.x, t0.y; # x^2 + y^2 */ 219 tgsi_transform_op2_swz_inst(ctx, TGSI_OPCODE_ADD, 220 TGSI_FILE_TEMPORARY, tmp0, TGSI_WRITEMASK_X, 221 TGSI_FILE_TEMPORARY, tmp0, TGSI_SWIZZLE_X, 222 TGSI_FILE_TEMPORARY, tmp0, TGSI_SWIZZLE_Y, false); 223 224 #if NORMALIZE /* OPTIONAL normalization of length */ 225 /* RSQ t0.x, t0.x; */ 226 tgsi_transform_op1_inst(ctx, TGSI_OPCODE_RSQ, 227 TGSI_FILE_TEMPORARY, tmp0, TGSI_WRITEMASK_X, 228 TGSI_FILE_TEMPORARY, tmp0); 229 230 /* RCP t0.x, t0.x; */ 231 tgsi_transform_op1_inst(ctx, TGSI_OPCODE_RCP, 232 TGSI_FILE_TEMPORARY, tmp0, TGSI_WRITEMASK_X, 233 TGSI_FILE_TEMPORARY, tmp0); 234 #endif 235 236 /* SGT t0.y, t0.xxxx, tex.wwww; # bool b = d > 1 (NOTE tex.w == 1) */ 237 tgsi_transform_op2_swz_inst(ctx, TGSI_OPCODE_SGT, 238 TGSI_FILE_TEMPORARY, tmp0, TGSI_WRITEMASK_Y, 239 TGSI_FILE_TEMPORARY, tmp0, TGSI_SWIZZLE_X, 240 TGSI_FILE_INPUT, texInput, TGSI_SWIZZLE_W, false); 241 242 /* KILL_IF -tmp0.yyyy; # if -tmp0.y < 0, KILL */ 243 tgsi_transform_kill_inst(ctx, TGSI_FILE_TEMPORARY, tmp0, 244 TGSI_SWIZZLE_Y, TRUE); 245 246 /* compute coverage factor = (1-d)/(1-k) */ 247 248 /* SUB t0.z, tex.w, tex.z; # m = 1 - k */ 249 tgsi_transform_op2_swz_inst(ctx, TGSI_OPCODE_ADD, 250 TGSI_FILE_TEMPORARY, tmp0, TGSI_WRITEMASK_Z, 251 TGSI_FILE_INPUT, texInput, TGSI_SWIZZLE_W, 252 TGSI_FILE_INPUT, texInput, TGSI_SWIZZLE_Z, true); 253 254 /* RCP t0.z, t0.z; # t0.z = 1 / m */ 255 newInst = tgsi_default_full_instruction(); 256 newInst.Instruction.Opcode = TGSI_OPCODE_RCP; 257 newInst.Instruction.NumDstRegs = 1; 258 newInst.Dst[0].Register.File = TGSI_FILE_TEMPORARY; 259 newInst.Dst[0].Register.Index = tmp0; 260 newInst.Dst[0].Register.WriteMask = TGSI_WRITEMASK_Z; 261 newInst.Instruction.NumSrcRegs = 1; 262 newInst.Src[0].Register.File = TGSI_FILE_TEMPORARY; 263 newInst.Src[0].Register.Index = tmp0; 264 newInst.Src[0].Register.SwizzleX = TGSI_SWIZZLE_Z; 265 ctx->emit_instruction(ctx, &newInst); 266 267 /* SUB t0.y, 1, t0.x; # d = 1 - d */ 268 tgsi_transform_op2_swz_inst(ctx, TGSI_OPCODE_ADD, 269 TGSI_FILE_TEMPORARY, tmp0, TGSI_WRITEMASK_Y, 270 TGSI_FILE_INPUT, texInput, TGSI_SWIZZLE_W, 271 TGSI_FILE_TEMPORARY, tmp0, TGSI_SWIZZLE_X, true); 272 273 /* MUL t0.w, t0.y, t0.z; # coverage = d * m */ 274 tgsi_transform_op2_swz_inst(ctx, TGSI_OPCODE_MUL, 275 TGSI_FILE_TEMPORARY, tmp0, TGSI_WRITEMASK_W, 276 TGSI_FILE_TEMPORARY, tmp0, TGSI_SWIZZLE_Y, 277 TGSI_FILE_TEMPORARY, tmp0, TGSI_SWIZZLE_Z, false); 278 279 /* SLE t0.y, t0.x, tex.z; # bool b = distance <= k */ 280 tgsi_transform_op2_swz_inst(ctx, TGSI_OPCODE_SLE, 281 TGSI_FILE_TEMPORARY, tmp0, TGSI_WRITEMASK_Y, 282 TGSI_FILE_TEMPORARY, tmp0, TGSI_SWIZZLE_X, 283 TGSI_FILE_INPUT, texInput, TGSI_SWIZZLE_Z, false); 284 285 /* CMP t0.w, -t0.y, tex.w, t0.w; 286 * # if -t0.y < 0 then 287 * t0.w = 1 288 * else 289 * t0.w = t0.w 290 */ 291 tgsi_transform_op3_swz_inst(ctx, TGSI_OPCODE_CMP, 292 TGSI_FILE_TEMPORARY, tmp0, TGSI_WRITEMASK_W, 293 TGSI_FILE_TEMPORARY, tmp0, TGSI_SWIZZLE_Y, 1, 294 TGSI_FILE_INPUT, texInput, TGSI_SWIZZLE_W, 295 TGSI_FILE_TEMPORARY, tmp0, TGSI_SWIZZLE_W); 296 } 297 298 299 /** 300 * TGSI transform callback. 301 * Insert new instructions before the END instruction. 302 */ 303 static void 304 aa_transform_epilog(struct tgsi_transform_context *ctx) 305 { 306 struct aa_transform_context *aactx = (struct aa_transform_context *) ctx; 307 308 /* add alpha modulation code at tail of program */ 309 310 /* MOV result.color.xyz, colorTemp; */ 311 tgsi_transform_op1_inst(ctx, TGSI_OPCODE_MOV, 312 TGSI_FILE_OUTPUT, aactx->colorOutput, 313 TGSI_WRITEMASK_XYZ, 314 TGSI_FILE_TEMPORARY, aactx->colorTemp); 315 316 /* MUL result.color.w, colorTemp, tmp0.w; */ 317 tgsi_transform_op2_inst(ctx, TGSI_OPCODE_MUL, 318 TGSI_FILE_OUTPUT, aactx->colorOutput, 319 TGSI_WRITEMASK_W, 320 TGSI_FILE_TEMPORARY, aactx->colorTemp, 321 TGSI_FILE_TEMPORARY, aactx->tmp0, false); 322 } 323 324 325 /** 326 * TGSI transform callback. 327 * Called per instruction. 328 * Replace writes to result.color w/ a temp reg. 329 */ 330 static void 331 aa_transform_inst(struct tgsi_transform_context *ctx, 332 struct tgsi_full_instruction *inst) 333 { 334 struct aa_transform_context *aactx = (struct aa_transform_context *) ctx; 335 unsigned i; 336 337 /* Not an END instruction. 338 * Look for writes to result.color and replace with colorTemp reg. 339 */ 340 for (i = 0; i < inst->Instruction.NumDstRegs; i++) { 341 struct tgsi_full_dst_register *dst = &inst->Dst[i]; 342 if (dst->Register.File == TGSI_FILE_OUTPUT && 343 dst->Register.Index == aactx->colorOutput) { 344 dst->Register.File = TGSI_FILE_TEMPORARY; 345 dst->Register.Index = aactx->colorTemp; 346 } 347 } 348 349 ctx->emit_instruction(ctx, inst); 350 } 351 352 353 /** 354 * Generate the frag shader we'll use for drawing AA points. 355 * This will be the user's shader plus some texture/modulate instructions. 356 */ 357 static boolean 358 generate_aapoint_fs(struct aapoint_stage *aapoint) 359 { 360 const struct pipe_shader_state *orig_fs = &aapoint->fs->state; 361 struct pipe_shader_state aapoint_fs; 362 struct aa_transform_context transform; 363 const uint newLen = tgsi_num_tokens(orig_fs->tokens) + NUM_NEW_TOKENS; 364 struct pipe_context *pipe = aapoint->stage.draw->pipe; 365 366 aapoint_fs = *orig_fs; /* copy to init */ 367 aapoint_fs.tokens = tgsi_alloc_tokens(newLen); 368 if (aapoint_fs.tokens == NULL) 369 return FALSE; 370 371 memset(&transform, 0, sizeof(transform)); 372 transform.colorOutput = -1; 373 transform.maxInput = -1; 374 transform.maxGeneric = -1; 375 transform.colorTemp = -1; 376 transform.tmp0 = -1; 377 transform.base.prolog = aa_transform_prolog; 378 transform.base.epilog = aa_transform_epilog; 379 transform.base.transform_instruction = aa_transform_inst; 380 transform.base.transform_declaration = aa_transform_decl; 381 382 tgsi_transform_shader(orig_fs->tokens, 383 (struct tgsi_token *) aapoint_fs.tokens, 384 newLen, &transform.base); 385 386 #if 0 /* DEBUG */ 387 debug_printf("draw_aapoint, orig shader:\n"); 388 tgsi_dump(orig_fs->tokens, 0); 389 debug_printf("draw_aapoint, new shader:\n"); 390 tgsi_dump(aapoint_fs.tokens, 0); 391 #endif 392 393 aapoint->fs->aapoint_fs 394 = aapoint->driver_create_fs_state(pipe, &aapoint_fs); 395 if (aapoint->fs->aapoint_fs == NULL) 396 goto fail; 397 398 aapoint->fs->generic_attrib = transform.maxGeneric + 1; 399 FREE((void *)aapoint_fs.tokens); 400 return TRUE; 401 402 fail: 403 FREE((void *)aapoint_fs.tokens); 404 return FALSE; 405 } 406 407 408 /** 409 * When we're about to draw our first AA point in a batch, this function is 410 * called to tell the driver to bind our modified fragment shader. 411 */ 412 static boolean 413 bind_aapoint_fragment_shader(struct aapoint_stage *aapoint) 414 { 415 struct draw_context *draw = aapoint->stage.draw; 416 struct pipe_context *pipe = draw->pipe; 417 418 if (!aapoint->fs->aapoint_fs && 419 !generate_aapoint_fs(aapoint)) 420 return FALSE; 421 422 draw->suspend_flushing = TRUE; 423 aapoint->driver_bind_fs_state(pipe, aapoint->fs->aapoint_fs); 424 draw->suspend_flushing = FALSE; 425 426 return TRUE; 427 } 428 429 430 431 static inline struct aapoint_stage * 432 aapoint_stage( struct draw_stage *stage ) 433 { 434 return (struct aapoint_stage *) stage; 435 } 436 437 438 439 440 /** 441 * Draw an AA point by drawing a quad. 442 */ 443 static void 444 aapoint_point(struct draw_stage *stage, struct prim_header *header) 445 { 446 const struct aapoint_stage *aapoint = aapoint_stage(stage); 447 struct prim_header tri; 448 struct vertex_header *v[4]; 449 const uint tex_slot = aapoint->tex_slot; 450 const uint pos_slot = aapoint->pos_slot; 451 float radius, *pos, *tex; 452 uint i; 453 float k; 454 455 if (aapoint->psize_slot >= 0) { 456 radius = 0.5f * header->v[0]->data[aapoint->psize_slot][0]; 457 } 458 else { 459 radius = aapoint->radius; 460 } 461 462 /* 463 * Note: the texcoords (generic attrib, really) we use are special: 464 * The S and T components simply vary from -1 to +1. 465 * The R component is k, below. 466 * The Q component is 1.0 and will used as a handy constant in the 467 * fragment shader. 468 */ 469 470 /* 471 * k is the threshold distance from the point's center at which 472 * we begin alpha attenuation (the coverage value). 473 * Operating within a unit circle, we'll compute the fragment's 474 * distance 'd' from the center point using the texcoords. 475 * IF d > 1.0 THEN 476 * KILL fragment 477 * ELSE IF d > k THEN 478 * compute coverage in [0,1] proportional to d in [k, 1]. 479 * ELSE 480 * coverage = 1.0; // full coverage 481 * ENDIF 482 * 483 * Note: the ELSEIF and ELSE clauses are actually implemented with CMP to 484 * avoid using IF/ELSE/ENDIF TGSI opcodes. 485 */ 486 487 #if !NORMALIZE 488 k = 1.0f / radius; 489 k = 1.0f - 2.0f * k + k * k; 490 #else 491 k = 1.0f - 1.0f / radius; 492 #endif 493 494 /* allocate/dup new verts */ 495 for (i = 0; i < 4; i++) { 496 v[i] = dup_vert(stage, header->v[0], i); 497 } 498 499 /* new verts */ 500 pos = v[0]->data[pos_slot]; 501 pos[0] -= radius; 502 pos[1] -= radius; 503 504 pos = v[1]->data[pos_slot]; 505 pos[0] += radius; 506 pos[1] -= radius; 507 508 pos = v[2]->data[pos_slot]; 509 pos[0] += radius; 510 pos[1] += radius; 511 512 pos = v[3]->data[pos_slot]; 513 pos[0] -= radius; 514 pos[1] += radius; 515 516 /* new texcoords */ 517 tex = v[0]->data[tex_slot]; 518 ASSIGN_4V(tex, -1, -1, k, 1); 519 520 tex = v[1]->data[tex_slot]; 521 ASSIGN_4V(tex, 1, -1, k, 1); 522 523 tex = v[2]->data[tex_slot]; 524 ASSIGN_4V(tex, 1, 1, k, 1); 525 526 tex = v[3]->data[tex_slot]; 527 ASSIGN_4V(tex, -1, 1, k, 1); 528 529 /* emit 2 tris for the quad strip */ 530 tri.v[0] = v[0]; 531 tri.v[1] = v[1]; 532 tri.v[2] = v[2]; 533 stage->next->tri( stage->next, &tri ); 534 535 tri.v[0] = v[0]; 536 tri.v[1] = v[2]; 537 tri.v[2] = v[3]; 538 stage->next->tri( stage->next, &tri ); 539 } 540 541 542 static void 543 aapoint_first_point(struct draw_stage *stage, struct prim_header *header) 544 { 545 auto struct aapoint_stage *aapoint = aapoint_stage(stage); 546 struct draw_context *draw = stage->draw; 547 struct pipe_context *pipe = draw->pipe; 548 const struct pipe_rasterizer_state *rast = draw->rasterizer; 549 void *r; 550 551 assert(draw->rasterizer->point_smooth); 552 553 if (draw->rasterizer->point_size <= 2.0) 554 aapoint->radius = 1.0; 555 else 556 aapoint->radius = 0.5f * draw->rasterizer->point_size; 557 558 /* 559 * Bind (generate) our fragprog. 560 */ 561 bind_aapoint_fragment_shader(aapoint); 562 563 draw_aapoint_prepare_outputs(draw, draw->pipeline.aapoint); 564 565 draw->suspend_flushing = TRUE; 566 567 /* Disable triangle culling, stippling, unfilled mode etc. */ 568 r = draw_get_rasterizer_no_cull(draw, rast->scissor, rast->flatshade); 569 pipe->bind_rasterizer_state(pipe, r); 570 571 draw->suspend_flushing = FALSE; 572 573 /* now really draw first point */ 574 stage->point = aapoint_point; 575 stage->point(stage, header); 576 } 577 578 579 static void 580 aapoint_flush(struct draw_stage *stage, unsigned flags) 581 { 582 struct draw_context *draw = stage->draw; 583 struct aapoint_stage *aapoint = aapoint_stage(stage); 584 struct pipe_context *pipe = draw->pipe; 585 586 stage->point = aapoint_first_point; 587 stage->next->flush( stage->next, flags ); 588 589 /* restore original frag shader */ 590 draw->suspend_flushing = TRUE; 591 aapoint->driver_bind_fs_state(pipe, aapoint->fs ? aapoint->fs->driver_fs : NULL); 592 593 /* restore original rasterizer state */ 594 if (draw->rast_handle) { 595 pipe->bind_rasterizer_state(pipe, draw->rast_handle); 596 } 597 598 draw->suspend_flushing = FALSE; 599 600 draw_remove_extra_vertex_attribs(draw); 601 } 602 603 604 static void 605 aapoint_reset_stipple_counter(struct draw_stage *stage) 606 { 607 stage->next->reset_stipple_counter( stage->next ); 608 } 609 610 611 static void 612 aapoint_destroy(struct draw_stage *stage) 613 { 614 struct aapoint_stage* aapoint = aapoint_stage(stage); 615 struct pipe_context *pipe = stage->draw->pipe; 616 617 draw_free_temp_verts( stage ); 618 619 /* restore the old entry points */ 620 pipe->create_fs_state = aapoint->driver_create_fs_state; 621 pipe->bind_fs_state = aapoint->driver_bind_fs_state; 622 pipe->delete_fs_state = aapoint->driver_delete_fs_state; 623 624 FREE( stage ); 625 } 626 627 void 628 draw_aapoint_prepare_outputs(struct draw_context *draw, 629 struct draw_stage *stage) 630 { 631 struct aapoint_stage *aapoint = aapoint_stage(stage); 632 const struct pipe_rasterizer_state *rast = draw->rasterizer; 633 634 /* update vertex attrib info */ 635 aapoint->pos_slot = draw_current_shader_position_output(draw); 636 637 if (!rast->point_smooth) 638 return; 639 640 /* allocate the extra post-transformed vertex attribute */ 641 aapoint->tex_slot = draw_alloc_extra_vertex_attrib(draw, 642 TGSI_SEMANTIC_GENERIC, 643 aapoint->fs->generic_attrib); 644 assert(aapoint->tex_slot > 0); /* output[0] is vertex pos */ 645 646 /* find psize slot in post-transform vertex */ 647 aapoint->psize_slot = -1; 648 if (draw->rasterizer->point_size_per_vertex) { 649 const struct tgsi_shader_info *info = draw_get_shader_info(draw); 650 uint i; 651 /* find PSIZ vertex output */ 652 for (i = 0; i < info->num_outputs; i++) { 653 if (info->output_semantic_name[i] == TGSI_SEMANTIC_PSIZE) { 654 aapoint->psize_slot = i; 655 break; 656 } 657 } 658 } 659 } 660 661 static struct aapoint_stage * 662 draw_aapoint_stage(struct draw_context *draw) 663 { 664 struct aapoint_stage *aapoint = CALLOC_STRUCT(aapoint_stage); 665 if (!aapoint) 666 goto fail; 667 668 aapoint->stage.draw = draw; 669 aapoint->stage.name = "aapoint"; 670 aapoint->stage.next = NULL; 671 aapoint->stage.point = aapoint_first_point; 672 aapoint->stage.line = draw_pipe_passthrough_line; 673 aapoint->stage.tri = draw_pipe_passthrough_tri; 674 aapoint->stage.flush = aapoint_flush; 675 aapoint->stage.reset_stipple_counter = aapoint_reset_stipple_counter; 676 aapoint->stage.destroy = aapoint_destroy; 677 678 if (!draw_alloc_temp_verts( &aapoint->stage, 4 )) 679 goto fail; 680 681 return aapoint; 682 683 fail: 684 if (aapoint) 685 aapoint->stage.destroy(&aapoint->stage); 686 687 return NULL; 688 689 } 690 691 692 static struct aapoint_stage * 693 aapoint_stage_from_pipe(struct pipe_context *pipe) 694 { 695 struct draw_context *draw = (struct draw_context *) pipe->draw; 696 return aapoint_stage(draw->pipeline.aapoint); 697 } 698 699 700 /** 701 * This function overrides the driver's create_fs_state() function and 702 * will typically be called by the state tracker. 703 */ 704 static void * 705 aapoint_create_fs_state(struct pipe_context *pipe, 706 const struct pipe_shader_state *fs) 707 { 708 struct aapoint_stage *aapoint = aapoint_stage_from_pipe(pipe); 709 struct aapoint_fragment_shader *aafs = CALLOC_STRUCT(aapoint_fragment_shader); 710 if (!aafs) 711 return NULL; 712 713 aafs->state.tokens = tgsi_dup_tokens(fs->tokens); 714 715 /* pass-through */ 716 aafs->driver_fs = aapoint->driver_create_fs_state(pipe, fs); 717 718 return aafs; 719 } 720 721 722 static void 723 aapoint_bind_fs_state(struct pipe_context *pipe, void *fs) 724 { 725 struct aapoint_stage *aapoint = aapoint_stage_from_pipe(pipe); 726 struct aapoint_fragment_shader *aafs = (struct aapoint_fragment_shader *) fs; 727 /* save current */ 728 aapoint->fs = aafs; 729 /* pass-through */ 730 aapoint->driver_bind_fs_state(pipe, 731 (aafs ? aafs->driver_fs : NULL)); 732 } 733 734 735 static void 736 aapoint_delete_fs_state(struct pipe_context *pipe, void *fs) 737 { 738 struct aapoint_stage *aapoint = aapoint_stage_from_pipe(pipe); 739 struct aapoint_fragment_shader *aafs = (struct aapoint_fragment_shader *) fs; 740 741 /* pass-through */ 742 aapoint->driver_delete_fs_state(pipe, aafs->driver_fs); 743 744 if (aafs->aapoint_fs) 745 aapoint->driver_delete_fs_state(pipe, aafs->aapoint_fs); 746 747 FREE((void*)aafs->state.tokens); 748 749 FREE(aafs); 750 } 751 752 753 /** 754 * Called by drivers that want to install this AA point prim stage 755 * into the draw module's pipeline. This will not be used if the 756 * hardware has native support for AA points. 757 */ 758 boolean 759 draw_install_aapoint_stage(struct draw_context *draw, 760 struct pipe_context *pipe) 761 { 762 struct aapoint_stage *aapoint; 763 764 pipe->draw = (void *) draw; 765 766 /* 767 * Create / install AA point drawing / prim stage 768 */ 769 aapoint = draw_aapoint_stage( draw ); 770 if (!aapoint) 771 return FALSE; 772 773 /* save original driver functions */ 774 aapoint->driver_create_fs_state = pipe->create_fs_state; 775 aapoint->driver_bind_fs_state = pipe->bind_fs_state; 776 aapoint->driver_delete_fs_state = pipe->delete_fs_state; 777 778 /* override the driver's functions */ 779 pipe->create_fs_state = aapoint_create_fs_state; 780 pipe->bind_fs_state = aapoint_bind_fs_state; 781 pipe->delete_fs_state = aapoint_delete_fs_state; 782 783 draw->pipeline.aapoint = &aapoint->stage; 784 785 return TRUE; 786 } 787
