src/gallium/drivers/softpipe/sp_prim_vbuf.c

   1 /**************************************************************************
   2  *
   3  * Copyright 2007 Tungsten Graphics, Inc., Cedar Park, Texas.
   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 TUNGSTEN GRAPHICS 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  * Interface between 'draw' module's output and the softpipe rasterizer/setup
  30  * code.  When the 'draw' module has finished filling a vertex buffer, the
  31  * draw_arrays() functions below will be called.  Loop over the vertices and
  32  * call the point/line/tri setup functions.
  33  *
  34  * Authors
  35  *  Brian Paul
  36  */
  37
  38
  39 #include "sp_context.h"
  40 #include "sp_setup.h"
  41 #include "sp_state.h"
  42 #include "sp_prim_vbuf.h"
  43 #include "draw/draw_context.h"
  44 #include "draw/draw_vbuf.h"
  45 #include "util/u_memory.h"
  46 #include "util/u_prim.h"
  47
  48
  49 #define SP_MAX_VBUF_INDEXES 1024
  50 #define SP_MAX_VBUF_SIZE    4096
  51
  52 typedef const float (*cptrf4)[4];
  53
  54 /**
  55  * Subclass of vbuf_render.
  56  */
  57 struct softpipe_vbuf_render
  58 {
  59    struct vbuf_render base;
  60    struct softpipe_context *softpipe;
  61    struct setup_context *setup;
  62
  63    uint prim;
  64    uint vertex_size;
  65    uint nr_vertices;
  66    uint vertex_buffer_size;
  67    void *vertex_buffer;
  68 };
  69
  70
  71 /** cast wrapper */
  72 static struct softpipe_vbuf_render *
  73 softpipe_vbuf_render(struct vbuf_render *vbr)
  74 {
  75    return (struct softpipe_vbuf_render *) vbr;
  76 }
  77
  78
  79
  80
  81
  82
  83
  84 static const struct vertex_info *
  85 sp_vbuf_get_vertex_info(struct vbuf_render *vbr)
  86 {
  87    struct softpipe_vbuf_render *cvbr = softpipe_vbuf_render(vbr);
  88    return softpipe_get_vbuf_vertex_info(cvbr->softpipe);
  89 }
  90
  91
  92 static boolean
  93 sp_vbuf_allocate_vertices(struct vbuf_render *vbr,
  94                           ushort vertex_size, ushort nr_vertices)
  95 {
  96    struct softpipe_vbuf_render *cvbr = softpipe_vbuf_render(vbr);
  97    unsigned size = vertex_size * nr_vertices;
  98
  99    if (cvbr->vertex_buffer_size < size) {
 100       align_free(cvbr->vertex_buffer);
 101       cvbr->vertex_buffer = align_malloc(size, 16);
 102       cvbr->vertex_buffer_size = size;
 103    }
 104
 105    cvbr->vertex_size = vertex_size;
 106    cvbr->nr_vertices = nr_vertices;
 107
 108    return cvbr->vertex_buffer != NULL;
 109 }
 110
 111 static void
 112 sp_vbuf_release_vertices(struct vbuf_render *vbr)
 113 {
 114    /* keep the old allocation for next time */
 115 }
 116
 117 static void *
 118 sp_vbuf_map_vertices(struct vbuf_render *vbr)
 119 {
 120    struct softpipe_vbuf_render *cvbr = softpipe_vbuf_render(vbr);
 121    return cvbr->vertex_buffer;
 122 }
 123
 124 static void
 125 sp_vbuf_unmap_vertices(struct vbuf_render *vbr,
 126                        ushort min_index,
 127                        ushort max_index )
 128 {
 129    struct softpipe_vbuf_render *cvbr = softpipe_vbuf_render(vbr);
 130    assert( cvbr->vertex_buffer_size >= (max_index+1) * cvbr->vertex_size );
 131    (void) cvbr;
 132    /* do nothing */
 133 }
 134
 135
 136 static boolean
 137 sp_vbuf_set_primitive(struct vbuf_render *vbr, unsigned prim)
 138 {
 139    struct softpipe_vbuf_render *cvbr = softpipe_vbuf_render(vbr);
 140    struct setup_context *setup_ctx = cvbr->setup;
 141
 142    sp_setup_prepare( setup_ctx );
 143
 144    cvbr->softpipe->reduced_prim = u_reduced_prim(prim);
 145    cvbr->prim = prim;
 146    return TRUE;
 147
 148 }
 149
 150
 151 static INLINE cptrf4 get_vert( const void *vertex_buffer,
 152                                int index,
 153                                int stride )
 154 {
 155    return (cptrf4)((char *)vertex_buffer + index * stride);
 156 }
 157
 158
 159 /**
 160  * draw elements / indexed primitives
 161  */
 162 static void
 163 sp_vbuf_draw(struct vbuf_render *vbr, const ushort *indices, uint nr)
 164 {
 165    struct softpipe_vbuf_render *cvbr = softpipe_vbuf_render(vbr);
 166    struct softpipe_context *softpipe = cvbr->softpipe;
 167    const unsigned stride = softpipe->vertex_info_vbuf.size * sizeof(float);
 168    const void *vertex_buffer = cvbr->vertex_buffer;
 169    struct setup_context *setup_ctx = cvbr->setup;
 170    unsigned i;
 171
 172    switch (cvbr->prim) {
 173    case PIPE_PRIM_POINTS:
 174       for (i = 0; i < nr; i++) {
 175          sp_setup_point( setup_ctx,
 176                       get_vert(vertex_buffer, indices[i-0], stride) );
 177       }
 178       break;
 179
 180    case PIPE_PRIM_LINES:
 181       for (i = 1; i < nr; i += 2) {
 182          sp_setup_line( setup_ctx,
 183                      get_vert(vertex_buffer, indices[i-1], stride),
 184                      get_vert(vertex_buffer, indices[i-0], stride) );
 185       }
 186       break;
 187
 188    case PIPE_PRIM_LINE_STRIP:
 189       for (i = 1; i < nr; i ++) {
 190          sp_setup_line( setup_ctx,
 191                      get_vert(vertex_buffer, indices[i-1], stride),
 192                      get_vert(vertex_buffer, indices[i-0], stride) );
 193       }
 194       break;
 195
 196    case PIPE_PRIM_LINE_LOOP:
 197       for (i = 1; i < nr; i ++) {
 198          sp_setup_line( setup_ctx,
 199                      get_vert(vertex_buffer, indices[i-1], stride),
 200                      get_vert(vertex_buffer, indices[i-0], stride) );
 201       }
 202       if (nr) {
 203          sp_setup_line( setup_ctx,
 204                      get_vert(vertex_buffer, indices[nr-1], stride),
 205                      get_vert(vertex_buffer, indices[0], stride) );
 206       }
 207       break;
 208
 209    case PIPE_PRIM_TRIANGLES:
 210       if (softpipe->rasterizer->flatshade_first) {
 211          for (i = 2; i < nr; i += 3) {
 212             sp_setup_tri( setup_ctx,
 213                        get_vert(vertex_buffer, indices[i-1], stride),
 214                        get_vert(vertex_buffer, indices[i-0], stride),
 215                        get_vert(vertex_buffer, indices[i-2], stride) );
 216          }
 217       }
 218       else {
 219          for (i = 2; i < nr; i += 3) {
 220             sp_setup_tri( setup_ctx,
 221                        get_vert(vertex_buffer, indices[i-2], stride),
 222                        get_vert(vertex_buffer, indices[i-1], stride),
 223                        get_vert(vertex_buffer, indices[i-0], stride) );
 224          }
 225       }
 226       break;
 227
 228    case PIPE_PRIM_TRIANGLE_STRIP:
 229       if (softpipe->rasterizer->flatshade_first) {
 230          for (i = 2; i < nr; i += 1) {
 231             sp_setup_tri( setup_ctx,
 232                        get_vert(vertex_buffer, indices[i+(i&1)-1], stride),
 233                        get_vert(vertex_buffer, indices[i-(i&1)], stride),
 234                        get_vert(vertex_buffer, indices[i-2], stride) );
 235          }
 236       }
 237       else {
 238          for (i = 2; i < nr; i += 1) {
 239             sp_setup_tri( setup_ctx,
 240                        get_vert(vertex_buffer, indices[i+(i&1)-2], stride),
 241                        get_vert(vertex_buffer, indices[i-(i&1)-1], stride),
 242                        get_vert(vertex_buffer, indices[i-0], stride) );
 243          }
 244       }
 245       break;
 246
 247    case PIPE_PRIM_TRIANGLE_FAN:
 248       if (softpipe->rasterizer->flatshade_first) {
 249          for (i = 2; i < nr; i += 1) {
 250             sp_setup_tri( setup_ctx,
 251                        get_vert(vertex_buffer, indices[i-0], stride),
 252                        get_vert(vertex_buffer, indices[0], stride),
 253                        get_vert(vertex_buffer, indices[i-1], stride) );
 254          }
 255       }
 256       else {
 257          for (i = 2; i < nr; i += 1) {
 258             sp_setup_tri( setup_ctx,
 259                        get_vert(vertex_buffer, indices[0], stride),
 260                        get_vert(vertex_buffer, indices[i-1], stride),
 261                        get_vert(vertex_buffer, indices[i-0], stride) );
 262          }
 263       }
 264       break;
 265
 266    case PIPE_PRIM_QUADS:
 267       if (softpipe->rasterizer->flatshade_first) {
 268          for (i = 3; i < nr; i += 4) {
 269             sp_setup_tri( setup_ctx,
 270                        get_vert(vertex_buffer, indices[i-2], stride),
 271                        get_vert(vertex_buffer, indices[i-1], stride),
 272                        get_vert(vertex_buffer, indices[i-3], stride) );
 273             sp_setup_tri( setup_ctx,
 274                        get_vert(vertex_buffer, indices[i-1], stride),
 275                        get_vert(vertex_buffer, indices[i-0], stride),
 276                        get_vert(vertex_buffer, indices[i-3], stride) );
 277          }
 278       }
 279       else {
 280          for (i = 3; i < nr; i += 4) {
 281             sp_setup_tri( setup_ctx,
 282                        get_vert(vertex_buffer, indices[i-3], stride),
 283                        get_vert(vertex_buffer, indices[i-2], stride),
 284                        get_vert(vertex_buffer, indices[i-0], stride) );
 285
 286             sp_setup_tri( setup_ctx,
 287                        get_vert(vertex_buffer, indices[i-2], stride),
 288                        get_vert(vertex_buffer, indices[i-1], stride),
 289                        get_vert(vertex_buffer, indices[i-0], stride) );
 290          }
 291       }
 292       break;
 293
 294    case PIPE_PRIM_QUAD_STRIP:
 295       if (softpipe->rasterizer->flatshade_first) {
 296          for (i = 3; i < nr; i += 2) {
 297             sp_setup_tri( setup_ctx,
 298                        get_vert(vertex_buffer, indices[i-0], stride),
 299                        get_vert(vertex_buffer, indices[i-1], stride),
 300                        get_vert(vertex_buffer, indices[i-3], stride));
 301             sp_setup_tri( setup_ctx,
 302                        get_vert(vertex_buffer, indices[i-2], stride),
 303                        get_vert(vertex_buffer, indices[i-0], stride),
 304                        get_vert(vertex_buffer, indices[i-3], stride) );
 305          }
 306       }
 307       else {
 308          for (i = 3; i < nr; i += 2) {
 309             sp_setup_tri( setup_ctx,
 310                        get_vert(vertex_buffer, indices[i-3], stride),
 311                        get_vert(vertex_buffer, indices[i-2], stride),
 312                        get_vert(vertex_buffer, indices[i-0], stride) );
 313             sp_setup_tri( setup_ctx,
 314                        get_vert(vertex_buffer, indices[i-1], stride),
 315                        get_vert(vertex_buffer, indices[i-3], stride),
 316                        get_vert(vertex_buffer, indices[i-0], stride) );
 317          }
 318       }
 319       break;
 320
 321    case PIPE_PRIM_POLYGON:
 322       /* Almost same as tri fan but the _first_ vertex specifies the flat
 323        * shading color.  Note that the first polygon vertex is passed as
 324        * the last triangle vertex here.
 325        * flatshade_first state makes no difference.
 326        */
 327       for (i = 2; i < nr; i += 1) {
 328          sp_setup_tri( setup_ctx,
 329                     get_vert(vertex_buffer, indices[i-0], stride),
 330                     get_vert(vertex_buffer, indices[i-1], stride),
 331                     get_vert(vertex_buffer, indices[0], stride) );
 332       }
 333       break;
 334
 335    default:
 336       assert(0);
 337    }
 338 }
 339
 340
 341 /**
 342  * This function is hit when the draw module is working in pass-through mode.
 343  * It's up to us to convert the vertex array into point/line/tri prims.
 344  */
 345 static void
 346 sp_vbuf_draw_arrays(struct vbuf_render *vbr, uint start, uint nr)
 347 {
 348    struct softpipe_vbuf_render *cvbr = softpipe_vbuf_render(vbr);
 349    struct softpipe_context *softpipe = cvbr->softpipe;
 350    struct setup_context *setup_ctx = cvbr->setup;
 351    const unsigned stride = softpipe->vertex_info_vbuf.size * sizeof(float);
 352    const void *vertex_buffer =
 353       (void *) get_vert(cvbr->vertex_buffer, start, stride);
 354    unsigned i;
 355
 356    switch (cvbr->prim) {
 357    case PIPE_PRIM_POINTS:
 358       for (i = 0; i < nr; i++) {
 359          sp_setup_point( setup_ctx,
 360                       get_vert(vertex_buffer, i-0, stride) );
 361       }
 362       break;
 363
 364    case PIPE_PRIM_LINES:
 365       for (i = 1; i < nr; i += 2) {
 366          sp_setup_line( setup_ctx,
 367                      get_vert(vertex_buffer, i-1, stride),
 368                      get_vert(vertex_buffer, i-0, stride) );
 369       }
 370       break;
 371
 372    case PIPE_PRIM_LINE_STRIP:
 373       for (i = 1; i < nr; i ++) {
 374          sp_setup_line( setup_ctx,
 375                      get_vert(vertex_buffer, i-1, stride),
 376                      get_vert(vertex_buffer, i-0, stride) );
 377       }
 378       break;
 379
 380    case PIPE_PRIM_LINE_LOOP:
 381       for (i = 1; i < nr; i ++) {
 382          sp_setup_line( setup_ctx,
 383                      get_vert(vertex_buffer, i-1, stride),
 384                      get_vert(vertex_buffer, i-0, stride) );
 385       }
 386       if (nr) {
 387          sp_setup_line( setup_ctx,
 388                      get_vert(vertex_buffer, nr-1, stride),
 389                      get_vert(vertex_buffer, 0, stride) );
 390       }
 391       break;
 392
 393    case PIPE_PRIM_TRIANGLES:
 394       if (softpipe->rasterizer->flatshade_first) {
 395          for (i = 2; i < nr; i += 3) {
 396             sp_setup_tri( setup_ctx,
 397                        get_vert(vertex_buffer, i-1, stride),
 398                        get_vert(vertex_buffer, i-0, stride),
 399                        get_vert(vertex_buffer, i-2, stride) );
 400          }
 401       }
 402       else {
 403          for (i = 2; i < nr; i += 3) {
 404             sp_setup_tri( setup_ctx,
 405                        get_vert(vertex_buffer, i-2, stride),
 406                        get_vert(vertex_buffer, i-1, stride),
 407                        get_vert(vertex_buffer, i-0, stride) );
 408          }
 409       }
 410       break;
 411
 412    case PIPE_PRIM_TRIANGLE_STRIP:
 413       if (softpipe->rasterizer->flatshade_first) {
 414          for (i = 2; i < nr; i++) {
 415             sp_setup_tri( setup_ctx,
 416                        get_vert(vertex_buffer, i+(i&1)-1, stride),
 417                        get_vert(vertex_buffer, i-(i&1), stride),
 418                        get_vert(vertex_buffer, i-2, stride) );
 419          }
 420       }
 421       else {
 422          for (i = 2; i < nr; i++) {
 423             sp_setup_tri( setup_ctx,
 424                        get_vert(vertex_buffer, i+(i&1)-2, stride),
 425                        get_vert(vertex_buffer, i-(i&1)-1, stride),
 426                        get_vert(vertex_buffer, i-0, stride) );
 427          }
 428       }
 429       break;
 430
 431    case PIPE_PRIM_TRIANGLE_FAN:
 432       if (softpipe->rasterizer->flatshade_first) {
 433          for (i = 2; i < nr; i += 1) {
 434             sp_setup_tri( setup_ctx,
 435                        get_vert(vertex_buffer, i-0, stride),
 436                        get_vert(vertex_buffer, 0, stride),
 437                        get_vert(vertex_buffer, i-1, stride) );
 438          }
 439       }
 440       else {
 441          for (i = 2; i < nr; i += 1) {
 442             sp_setup_tri( setup_ctx,
 443                        get_vert(vertex_buffer, 0, stride),
 444                        get_vert(vertex_buffer, i-1, stride),
 445                        get_vert(vertex_buffer, i-0, stride) );
 446          }
 447       }
 448       break;
 449
 450    case PIPE_PRIM_QUADS:
 451       if (softpipe->rasterizer->flatshade_first) {
 452          for (i = 3; i < nr; i += 4) {
 453             sp_setup_tri( setup_ctx,
 454                        get_vert(vertex_buffer, i-2, stride),
 455                        get_vert(vertex_buffer, i-1, stride),
 456                        get_vert(vertex_buffer, i-3, stride) );
 457             sp_setup_tri( setup_ctx,
 458                        get_vert(vertex_buffer, i-1, stride),
 459                        get_vert(vertex_buffer, i-0, stride),
 460                        get_vert(vertex_buffer, i-3, stride) );
 461          }
 462       }
 463       else {
 464          for (i = 3; i < nr; i += 4) {
 465             sp_setup_tri( setup_ctx,
 466                        get_vert(vertex_buffer, i-3, stride),
 467                        get_vert(vertex_buffer, i-2, stride),
 468                        get_vert(vertex_buffer, i-0, stride) );
 469             sp_setup_tri( setup_ctx,
 470                        get_vert(vertex_buffer, i-2, stride),
 471                        get_vert(vertex_buffer, i-1, stride),
 472                        get_vert(vertex_buffer, i-0, stride) );
 473          }
 474       }
 475       break;
 476
 477    case PIPE_PRIM_QUAD_STRIP:
 478       if (softpipe->rasterizer->flatshade_first) {
 479          for (i = 3; i < nr; i += 2) {
 480             sp_setup_tri( setup_ctx,
 481                        get_vert(vertex_buffer, i-0, stride),
 482                        get_vert(vertex_buffer, i-1, stride),
 483                        get_vert(vertex_buffer, i-3, stride) );
 484             sp_setup_tri( setup_ctx,
 485                        get_vert(vertex_buffer, i-2, stride),
 486                        get_vert(vertex_buffer, i-0, stride),
 487                        get_vert(vertex_buffer, i-3, stride) );
 488          }
 489       }
 490       else {
 491          for (i = 3; i < nr; i += 2) {
 492             sp_setup_tri( setup_ctx,
 493                        get_vert(vertex_buffer, i-3, stride),
 494                        get_vert(vertex_buffer, i-2, stride),
 495                        get_vert(vertex_buffer, i-0, stride) );
 496             sp_setup_tri( setup_ctx,
 497                        get_vert(vertex_buffer, i-1, stride),
 498                        get_vert(vertex_buffer, i-3, stride),
 499                        get_vert(vertex_buffer, i-0, stride) );
 500          }
 501       }
 502       break;
 503
 504    case PIPE_PRIM_POLYGON:
 505       /* Almost same as tri fan but the _first_ vertex specifies the flat
 506        * shading color.  Note that the first polygon vertex is passed as
 507        * the last triangle vertex here.
 508        * flatshade_first state makes no difference.
 509        */
 510       for (i = 2; i < nr; i += 1) {
 511          sp_setup_tri( setup_ctx,
 512                     get_vert(vertex_buffer, i-1, stride),
 513                     get_vert(vertex_buffer, i-0, stride),
 514                     get_vert(vertex_buffer, 0, stride) );
 515       }
 516       break;
 517
 518    default:
 519       assert(0);
 520    }
 521 }
 522
 523
 524
 525 static void
 526 sp_vbuf_destroy(struct vbuf_render *vbr)
 527 {
 528    struct softpipe_vbuf_render *cvbr = softpipe_vbuf_render(vbr);
 529    if(cvbr->vertex_buffer)
 530       align_free(cvbr->vertex_buffer);
 531    sp_setup_destroy_context(cvbr->setup);
 532    FREE(cvbr);
 533 }
 534
 535
 536 /**
 537  * Create the post-transform vertex handler for the given context.
 538  */
 539 struct vbuf_render *
 540 sp_create_vbuf_backend(struct softpipe_context *sp)
 541 {
 542    struct softpipe_vbuf_render *cvbr = CALLOC_STRUCT(softpipe_vbuf_render);
 543
 544    assert(sp->draw);
 545
 546    cvbr->base.max_indices = SP_MAX_VBUF_INDEXES;
 547    cvbr->base.max_vertex_buffer_bytes = SP_MAX_VBUF_SIZE;
 548
 549    cvbr->base.get_vertex_info = sp_vbuf_get_vertex_info;
 550    cvbr->base.allocate_vertices = sp_vbuf_allocate_vertices;
 551    cvbr->base.map_vertices = sp_vbuf_map_vertices;
 552    cvbr->base.unmap_vertices = sp_vbuf_unmap_vertices;
 553    cvbr->base.set_primitive = sp_vbuf_set_primitive;
 554    cvbr->base.draw = sp_vbuf_draw;
 555    cvbr->base.draw_arrays = sp_vbuf_draw_arrays;
 556    cvbr->base.release_vertices = sp_vbuf_release_vertices;
 557    cvbr->base.destroy = sp_vbuf_destroy;
 558
 559    cvbr->softpipe = sp;
 560
 561    cvbr->setup = sp_setup_create_context(cvbr->softpipe);
 562
 563    return &cvbr->base;
 564 }