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_state.h"
  41 #include "sp_prim_vbuf.h"
  42 #include "sp_prim_setup.h"
  43 #include "sp_setup.h"
  44 #include "draw/draw_context.h"
  45 #include "draw/draw_vbuf.h"
  46 #include "util/u_memory.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    uint prim;
  62    uint vertex_size;
  63    uint nr_vertices;
  64    uint vertex_buffer_size;
  65    void *vertex_buffer;
  66 };
  67
  68
  69 /** cast wrapper */
  70 static struct softpipe_vbuf_render *
  71 softpipe_vbuf_render(struct vbuf_render *vbr)
  72 {
  73    return (struct softpipe_vbuf_render *) vbr;
  74 }
  75
  76
  77 static const struct vertex_info *
  78 sp_vbuf_get_vertex_info(struct vbuf_render *vbr)
  79 {
  80    struct softpipe_vbuf_render *cvbr = softpipe_vbuf_render(vbr);
  81    return softpipe_get_vbuf_vertex_info(cvbr->softpipe);
  82 }
  83
  84
  85 static boolean
  86 sp_vbuf_allocate_vertices(struct vbuf_render *vbr,
  87                           ushort vertex_size, ushort nr_vertices)
  88 {
  89    struct softpipe_vbuf_render *cvbr = softpipe_vbuf_render(vbr);
  90    unsigned size = vertex_size * nr_vertices;
  91
  92    if (cvbr->vertex_buffer_size < size) {
  93       align_free(cvbr->vertex_buffer);
  94       cvbr->vertex_buffer = align_malloc(size, 16);
  95       cvbr->vertex_buffer_size = size;
  96    }
  97
  98    cvbr->vertex_size = vertex_size;
  99    cvbr->nr_vertices = nr_vertices;
 100
 101    return cvbr->vertex_buffer != NULL;
 102 }
 103
 104 static void
 105 sp_vbuf_release_vertices(struct vbuf_render *vbr)
 106 {
 107 #if 0
 108    {
 109       struct softpipe_vbuf_render *cvbr = softpipe_vbuf_render(vbr);
 110       const struct vertex_info *info =
 111          softpipe_get_vbuf_vertex_info(cvbr->softpipe);
 112       const float *vtx = (const float *) cvbr->vertex_buffer;
 113       uint i, j;
 114       debug_printf("%s (vtx_size = %u,  vtx_used = %u)\n",
 115              __FUNCTION__, cvbr->vertex_size, cvbr->nr_vertices);
 116       for (i = 0; i < cvbr->nr_vertices; i++) {
 117          for (j = 0; j < info->num_attribs; j++) {
 118             uint k;
 119             switch (info->attrib[j].emit) {
 120             case EMIT_4F:  k = 4;   break;
 121             case EMIT_3F:  k = 3;   break;
 122             case EMIT_2F:  k = 2;   break;
 123             case EMIT_1F:  k = 1;   break;
 124             default: assert(0);
 125             }
 126             debug_printf("Vert %u attr %u: ", i, j);
 127             while (k-- > 0) {
 128                debug_printf("%g ", vtx[0]);
 129                vtx++;
 130             }
 131             debug_printf("\n");
 132          }
 133       }
 134    }
 135 #endif
 136
 137    /* keep the old allocation for next time */
 138 }
 139
 140 static void *
 141 sp_vbuf_map_vertices(struct vbuf_render *vbr)
 142 {
 143    struct softpipe_vbuf_render *cvbr = softpipe_vbuf_render(vbr);
 144    return cvbr->vertex_buffer;
 145 }
 146
 147 static void
 148 sp_vbuf_unmap_vertices(struct vbuf_render *vbr,
 149                        ushort min_index,
 150                        ushort max_index )
 151 {
 152    struct softpipe_vbuf_render *cvbr = softpipe_vbuf_render(vbr);
 153    assert( cvbr->vertex_buffer_size >= (max_index+1) * cvbr->vertex_size );
 154    /* do nothing */
 155 }
 156
 157
 158 static boolean
 159 sp_vbuf_set_primitive(struct vbuf_render *vbr, unsigned prim)
 160 {
 161    struct softpipe_vbuf_render *cvbr = softpipe_vbuf_render(vbr);
 162
 163    /* XXX: break this dependency - make setup_context live under
 164     * softpipe, rename the old "setup" draw stage to something else.
 165     */
 166    struct setup_context *setup_ctx = sp_draw_setup_context(cvbr->softpipe->setup);
 167
 168    setup_prepare( setup_ctx );
 169
 170    cvbr->prim = prim;
 171    return TRUE;
 172
 173 }
 174
 175
 176 static INLINE cptrf4 get_vert( const void *vertex_buffer,
 177                                int index,
 178                                int stride )
 179 {
 180    return (cptrf4)((char *)vertex_buffer + index * stride);
 181 }
 182
 183
 184 /**
 185  * draw elements / indexed primitives
 186  */
 187 static void
 188 sp_vbuf_draw(struct vbuf_render *vbr, const ushort *indices, uint nr)
 189 {
 190    struct softpipe_vbuf_render *cvbr = softpipe_vbuf_render(vbr);
 191    struct softpipe_context *softpipe = cvbr->softpipe;
 192    const unsigned stride = softpipe->vertex_info_vbuf.size * sizeof(float);
 193    const void *vertex_buffer = cvbr->vertex_buffer;
 194    unsigned i;
 195
 196    /* XXX: break this dependency - make setup_context live under
 197     * softpipe, rename the old "setup" draw stage to something else.
 198     */
 199    struct draw_stage *setup = softpipe->setup;
 200    struct setup_context *setup_ctx = sp_draw_setup_context(setup);
 201
 202    switch (cvbr->prim) {
 203    case PIPE_PRIM_POINTS:
 204       for (i = 0; i < nr; i++) {
 205          setup_point( setup_ctx,
 206                       get_vert(vertex_buffer, indices[i-0], stride) );
 207       }
 208       break;
 209
 210    case PIPE_PRIM_LINES:
 211       for (i = 1; i < nr; i += 2) {
 212          setup_line( setup_ctx,
 213                      get_vert(vertex_buffer, indices[i-1], stride),
 214                      get_vert(vertex_buffer, indices[i-0], stride) );
 215       }
 216       break;
 217
 218    case PIPE_PRIM_LINE_STRIP:
 219       for (i = 1; i < nr; i ++) {
 220          setup_line( setup_ctx,
 221                      get_vert(vertex_buffer, indices[i-1], stride),
 222                      get_vert(vertex_buffer, indices[i-0], stride) );
 223       }
 224       break;
 225
 226    case PIPE_PRIM_LINE_LOOP:
 227       for (i = 1; i < nr; i ++) {
 228          setup_line( setup_ctx,
 229                      get_vert(vertex_buffer, indices[i-1], stride),
 230                      get_vert(vertex_buffer, indices[i-0], stride) );
 231       }
 232       if (nr) {
 233          setup_line( setup_ctx,
 234                      get_vert(vertex_buffer, indices[nr-1], stride),
 235                      get_vert(vertex_buffer, indices[0], stride) );
 236       }
 237       break;
 238
 239    case PIPE_PRIM_TRIANGLES:
 240       for (i = 2; i < nr; i += 3) {
 241          setup_tri( setup_ctx,
 242                     get_vert(vertex_buffer, indices[i-2], stride),
 243                     get_vert(vertex_buffer, indices[i-1], stride),
 244                     get_vert(vertex_buffer, indices[i-0], stride));
 245       }
 246       break;
 247
 248    case PIPE_PRIM_TRIANGLE_STRIP:
 249       for (i = 2; i < nr; i += 1) {
 250          setup_tri( setup_ctx,
 251                     get_vert(vertex_buffer, indices[i+(i&1)-2], stride),
 252                     get_vert(vertex_buffer, indices[i-(i&1)-1], stride),
 253                     get_vert(vertex_buffer, indices[i-0], stride));
 254       }
 255       break;
 256
 257    case PIPE_PRIM_TRIANGLE_FAN:
 258       for (i = 2; i < nr; i += 1) {
 259          setup_tri( setup_ctx,
 260                     get_vert(vertex_buffer, indices[0], stride),
 261                     get_vert(vertex_buffer, indices[i-1], stride),
 262                     get_vert(vertex_buffer, indices[i-0], stride));
 263       }
 264       break;
 265
 266    case PIPE_PRIM_QUADS:
 267       for (i = 3; i < nr; i += 4) {
 268          setup_tri( setup_ctx,
 269                     get_vert(vertex_buffer, indices[i-3], stride),
 270                     get_vert(vertex_buffer, indices[i-2], stride),
 271                     get_vert(vertex_buffer, indices[i-0], stride));
 272
 273          setup_tri( setup_ctx,
 274                     get_vert(vertex_buffer, indices[i-2], stride),
 275                     get_vert(vertex_buffer, indices[i-1], stride),
 276                     get_vert(vertex_buffer, indices[i-0], stride));
 277       }
 278       break;
 279
 280    case PIPE_PRIM_QUAD_STRIP:
 281       for (i = 3; i < nr; i += 2) {
 282          setup_tri( setup_ctx,
 283                     get_vert(vertex_buffer, indices[i-3], stride),
 284                     get_vert(vertex_buffer, indices[i-2], stride),
 285                     get_vert(vertex_buffer, indices[i-0], stride));
 286
 287          setup_tri( setup_ctx,
 288                     get_vert(vertex_buffer, indices[i-1], stride),
 289                     get_vert(vertex_buffer, indices[i-3], stride),
 290                     get_vert(vertex_buffer, indices[i-0], stride));
 291       }
 292       break;
 293
 294    case PIPE_PRIM_POLYGON:
 295       for (i = 2; i < nr; i += 1) {
 296          setup_tri( setup_ctx,
 297                     get_vert(vertex_buffer, indices[0-1], stride),
 298                     get_vert(vertex_buffer, indices[i-0], stride),
 299                     get_vert(vertex_buffer, indices[0], stride));
 300       }
 301       break;
 302
 303    default:
 304       assert(0);
 305    }
 306
 307    /* XXX: why are we calling this???  If we had to call something, it
 308     * would be a function in sp_setup.c:
 309     */
 310    sp_draw_flush( setup );
 311 }
 312
 313
 314 /**
 315  * This function is hit when the draw module is working in pass-through mode.
 316  * It's up to us to convert the vertex array into point/line/tri prims.
 317  */
 318 static void
 319 sp_vbuf_draw_arrays(struct vbuf_render *vbr, uint start, uint nr)
 320 {
 321    struct softpipe_vbuf_render *cvbr = softpipe_vbuf_render(vbr);
 322    struct softpipe_context *softpipe = cvbr->softpipe;
 323    const unsigned stride = softpipe->vertex_info_vbuf.size * sizeof(float);
 324    const void *vertex_buffer =
 325       (void *) get_vert(cvbr->vertex_buffer, start, stride);
 326    unsigned i;
 327
 328    /* XXX: break this dependency - make setup_context live under
 329     * softpipe, rename the old "setup" draw stage to something else.
 330     */
 331    struct draw_stage *setup = softpipe->setup;
 332    struct setup_context *setup_ctx = sp_draw_setup_context(setup);
 333
 334    switch (cvbr->prim) {
 335    case PIPE_PRIM_POINTS:
 336       for (i = 0; i < nr; i++) {
 337          setup_point( setup_ctx,
 338                       get_vert(vertex_buffer, i-0, stride) );
 339       }
 340       break;
 341
 342    case PIPE_PRIM_LINES:
 343       for (i = 1; i < nr; i += 2) {
 344          setup_line( setup_ctx,
 345                      get_vert(vertex_buffer, i-1, stride),
 346                      get_vert(vertex_buffer, i-0, stride) );
 347       }
 348       break;
 349
 350    case PIPE_PRIM_LINE_STRIP:
 351       for (i = 1; i < nr; i ++) {
 352          setup_line( setup_ctx,
 353                      get_vert(vertex_buffer, i-1, stride),
 354                      get_vert(vertex_buffer, i-0, stride) );
 355       }
 356       break;
 357
 358    case PIPE_PRIM_LINE_LOOP:
 359       for (i = 1; i < nr; i ++) {
 360          setup_line( setup_ctx,
 361                      get_vert(vertex_buffer, i-1, stride),
 362                      get_vert(vertex_buffer, i-0, stride) );
 363       }
 364       if (nr) {
 365          setup_line( setup_ctx,
 366                      get_vert(vertex_buffer, nr-1, stride),
 367                      get_vert(vertex_buffer, 0, stride) );
 368       }
 369       break;
 370
 371
 372    case PIPE_PRIM_TRIANGLES:
 373       for (i = 2; i < nr; i += 3) {
 374          setup_tri( setup_ctx,
 375                     get_vert(vertex_buffer, i-2, stride),
 376                     get_vert(vertex_buffer, i-1, stride),
 377                     get_vert(vertex_buffer, i-0, stride));
 378       }
 379       break;
 380
 381    case PIPE_PRIM_TRIANGLE_STRIP:
 382       for (i = 2; i < nr; i += 1) {
 383          setup_tri( setup_ctx,
 384                     get_vert(vertex_buffer, i+(i&1)-2, stride),
 385                     get_vert(vertex_buffer, i-(i&1)-1, stride),
 386                     get_vert(vertex_buffer, i-0, stride));
 387       }
 388       break;
 389
 390    case PIPE_PRIM_TRIANGLE_FAN:
 391       for (i = 2; i < nr; i += 1) {
 392          setup_tri( setup_ctx,
 393                     get_vert(vertex_buffer, 0, stride),
 394                     get_vert(vertex_buffer, i-1, stride),
 395                     get_vert(vertex_buffer, i-0, stride));
 396       }
 397       break;
 398
 399    case PIPE_PRIM_QUADS:
 400       for (i = 3; i < nr; i += 4) {
 401          setup_tri( setup_ctx,
 402                     get_vert(vertex_buffer, i-3, stride),
 403                     get_vert(vertex_buffer, i-2, stride),
 404                     get_vert(vertex_buffer, i-0, stride));
 405
 406          setup_tri( setup_ctx,
 407                     get_vert(vertex_buffer, i-2, stride),
 408                     get_vert(vertex_buffer, i-1, stride),
 409                     get_vert(vertex_buffer, i-0, stride));
 410       }
 411       break;
 412    case PIPE_PRIM_QUAD_STRIP:
 413       for (i = 3; i < nr; i += 2) {
 414          setup_tri( setup_ctx,
 415                     get_vert(vertex_buffer, i-3, stride),
 416                     get_vert(vertex_buffer, i-2, stride),
 417                     get_vert(vertex_buffer, i-0, stride));
 418
 419          setup_tri( setup_ctx,
 420                     get_vert(vertex_buffer, i-1, stride),
 421                     get_vert(vertex_buffer, i-3, stride),
 422                     get_vert(vertex_buffer, i-0, stride));
 423       }
 424       break;
 425
 426    case PIPE_PRIM_POLYGON:
 427       /* Almost same as tri fan but the _first_ vertex specifies the flat
 428        * shading color.  Note that the first polygon vertex is passed as
 429        * the last triangle vertex here.
 430        */
 431       for (i = 2; i < nr; i += 1) {
 432          setup_tri( setup_ctx,
 433                     get_vert(vertex_buffer, i-1, stride),
 434                     get_vert(vertex_buffer, i-0, stride),
 435                     get_vert(vertex_buffer, 0, stride));
 436       }
 437       break;
 438
 439    default:
 440       assert(0);
 441    }
 442 }
 443
 444
 445
 446 static void
 447 sp_vbuf_destroy(struct vbuf_render *vbr)
 448 {
 449    struct softpipe_vbuf_render *cvbr = softpipe_vbuf_render(vbr);
 450    cvbr->softpipe->vbuf_render = NULL;
 451    FREE(cvbr);
 452 }
 453
 454
 455 /**
 456  * Initialize the post-transform vertex buffer information for the given
 457  * context.
 458  */
 459 void
 460 sp_init_vbuf(struct softpipe_context *sp)
 461 {
 462    assert(sp->draw);
 463
 464    sp->vbuf_render = CALLOC_STRUCT(softpipe_vbuf_render);
 465
 466    sp->vbuf_render->base.max_indices = SP_MAX_VBUF_INDEXES;
 467    sp->vbuf_render->base.max_vertex_buffer_bytes = SP_MAX_VBUF_SIZE;
 468
 469    sp->vbuf_render->base.get_vertex_info = sp_vbuf_get_vertex_info;
 470    sp->vbuf_render->base.allocate_vertices = sp_vbuf_allocate_vertices;
 471    sp->vbuf_render->base.map_vertices = sp_vbuf_map_vertices;
 472    sp->vbuf_render->base.unmap_vertices = sp_vbuf_unmap_vertices;
 473    sp->vbuf_render->base.set_primitive = sp_vbuf_set_primitive;
 474    sp->vbuf_render->base.draw = sp_vbuf_draw;
 475    sp->vbuf_render->base.draw_arrays = sp_vbuf_draw_arrays;
 476    sp->vbuf_render->base.release_vertices = sp_vbuf_release_vertices;
 477    sp->vbuf_render->base.destroy = sp_vbuf_destroy;
 478
 479    sp->vbuf_render->softpipe = sp;
 480
 481    sp->vbuf = draw_vbuf_stage(sp->draw, &sp->vbuf_render->base);
 482
 483    draw_set_rasterize_stage(sp->draw, sp->vbuf);
 484
 485    draw_set_render(sp->draw, &sp->vbuf_render->base);
 486 }