src/gallium/auxiliary/draw/draw_pt_fetch_emit.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   * Authors:
  30   *   Keith Whitwell <keith@tungstengraphics.com>
  31   */
  32
  33 #include "util/u_memory.h"
  34 #include "draw/draw_context.h"
  35 #include "draw/draw_private.h"
  36 #include "draw/draw_vbuf.h"
  37 #include "draw/draw_vertex.h"
  38 #include "draw/draw_pt.h"
  39 #include "translate/translate.h"
  40 #include "translate/translate_cache.h"
  41
  42 /* The simplest 'middle end' in the new vertex code.
  43  *
  44  * The responsibilities of a middle end are to:
  45  *  - perform vertex fetch using
  46  *       - draw vertex element/buffer state
  47  *       - a list of fetch indices we received as an input
  48  *  - run the vertex shader
  49  *  - cliptest,
  50  *  - clip coord calculation
  51  *  - viewport transformation
  52  *  - if necessary, run the primitive pipeline, passing it:
  53  *       - a linear array of vertex_header vertices constructed here
  54  *       - a set of draw indices we received as an input
  55  *  - otherwise, drive the hw backend,
  56  *       - allocate space for hardware format vertices
  57  *       - translate the vertex-shader output vertices to hw format
  58  *       - calling the backend draw functions.
  59  *
  60  * For convenience, we provide a helper function to drive the hardware
  61  * backend given similar inputs to those required to run the pipeline.
  62  *
  63  * In the case of passthrough mode, many of these actions are disabled
  64  * or noops, so we end up doing:
  65  *
  66  *  - perform vertex fetch
  67  *  - drive the hw backend
  68  *
  69  * IE, basically just vertex fetch to post-vs-format vertices,
  70  * followed by a call to the backend helper function.
  71  */
  72
  73
  74 struct fetch_emit_middle_end {
  75    struct draw_pt_middle_end base;
  76    struct draw_context *draw;
  77
  78    struct translate *translate;
  79    const struct vertex_info *vinfo;
  80
  81    /* Cache point size somewhere it's address won't change:
  82     */
  83    float point_size;
  84
  85    struct translate_cache *cache;
  86 };
  87
  88
  89
  90
  91 static void fetch_emit_prepare( struct draw_pt_middle_end *middle,
  92                                 unsigned prim,
  93                                 unsigned opt,
  94                                 unsigned *max_vertices )
  95 {
  96    struct fetch_emit_middle_end *feme = (struct fetch_emit_middle_end *)middle;
  97    struct draw_context *draw = feme->draw;
  98    const struct vertex_info *vinfo;
  99    unsigned i, dst_offset;
 100    boolean ok;
 101    struct translate_key key;
 102
 103
 104    ok = draw->render->set_primitive( draw->render,
 105                                      prim );
 106    if (!ok) {
 107       assert(0);
 108       return;
 109    }
 110
 111    /* Must do this after set_primitive() above:
 112     */
 113    vinfo = feme->vinfo = draw->render->get_vertex_info(draw->render);
 114
 115
 116
 117    /* Transform from API vertices to HW vertices, skipping the
 118     * pipeline_vertex intermediate step.
 119     */
 120    dst_offset = 0;
 121    memset(&key, 0, sizeof(key));
 122
 123    for (i = 0; i < vinfo->num_attribs; i++) {
 124       const struct pipe_vertex_element *src = &draw->pt.vertex_element[vinfo->attrib[i].src_index];
 125
 126       unsigned emit_sz = 0;
 127       unsigned input_format = src->src_format;
 128       unsigned input_buffer = src->vertex_buffer_index;
 129       unsigned input_offset = src->src_offset;
 130       unsigned output_format;
 131
 132       switch (vinfo->attrib[i].emit) {
 133       case EMIT_4UB:
 134          output_format = PIPE_FORMAT_R8G8B8A8_UNORM;
 135          emit_sz = 4 * sizeof(unsigned char);
 136          break;
 137       case EMIT_4F:
 138          output_format = PIPE_FORMAT_R32G32B32A32_FLOAT;
 139          emit_sz = 4 * sizeof(float);
 140          break;
 141       case EMIT_3F:
 142          output_format = PIPE_FORMAT_R32G32B32_FLOAT;
 143          emit_sz = 3 * sizeof(float);
 144          break;
 145       case EMIT_2F:
 146          output_format = PIPE_FORMAT_R32G32_FLOAT;
 147          emit_sz = 2 * sizeof(float);
 148          break;
 149       case EMIT_1F:
 150          output_format = PIPE_FORMAT_R32_FLOAT;
 151          emit_sz = 1 * sizeof(float);
 152          break;
 153       case EMIT_1F_PSIZE:
 154          input_format = PIPE_FORMAT_R32_FLOAT;
 155          input_buffer = draw->pt.nr_vertex_buffers;
 156          input_offset = 0;
 157          output_format = PIPE_FORMAT_R32_FLOAT;
 158          emit_sz = 1 * sizeof(float);
 159          break;
 160       case EMIT_OMIT:
 161          continue;
 162       default:
 163          assert(0);
 164          output_format = PIPE_FORMAT_NONE;
 165          emit_sz = 0;
 166          continue;
 167       }
 168
 169       key.element[i].input_format = input_format;
 170       key.element[i].input_buffer = input_buffer;
 171       key.element[i].input_offset = input_offset;
 172       key.element[i].output_format = output_format;
 173       key.element[i].output_offset = dst_offset;
 174
 175       dst_offset += emit_sz;
 176    }
 177
 178    key.nr_elements = vinfo->num_attribs;
 179    key.output_stride = vinfo->size * 4;
 180
 181    /* Don't bother with caching at this stage:
 182     */
 183    if (!feme->translate ||
 184        translate_key_compare(&feme->translate->key, &key) != 0)
 185    {
 186       translate_key_sanitize(&key);
 187       feme->translate = translate_cache_find(feme->cache,
 188                                              &key);
 189
 190
 191       feme->translate->set_buffer(feme->translate,
 192                                   draw->pt.nr_vertex_buffers,
 193                                   &feme->point_size,
 194                                   0);
 195    }
 196
 197    feme->point_size = draw->rasterizer->point_size;
 198
 199    for (i = 0; i < draw->pt.nr_vertex_buffers; i++) {
 200       feme->translate->set_buffer(feme->translate,
 201                                   i,
 202                                   ((char *)draw->pt.user.vbuffer[i] +
 203                                    draw->pt.vertex_buffer[i].buffer_offset),
 204                                   draw->pt.vertex_buffer[i].stride );
 205    }
 206
 207    *max_vertices = (draw->render->max_vertex_buffer_bytes /
 208                     (vinfo->size * 4));
 209
 210    /* Return an even number of verts.
 211     * This prevents "parity" errors when splitting long triangle strips which
 212     * can lead to front/back culling mix-ups.
 213     * Every other triangle in a strip has an alternate front/back orientation
 214     * so splitting at an odd position can cause the orientation of subsequent
 215     * triangles to get reversed.
 216     */
 217    *max_vertices = *max_vertices & ~1;
 218 }
 219
 220
 221
 222
 223
 224 static void fetch_emit_run( struct draw_pt_middle_end *middle,
 225                             const unsigned *fetch_elts,
 226                             unsigned fetch_count,
 227                             const ushort *draw_elts,
 228                             unsigned draw_count )
 229 {
 230    struct fetch_emit_middle_end *feme = (struct fetch_emit_middle_end *)middle;
 231    struct draw_context *draw = feme->draw;
 232    void *hw_verts;
 233
 234    /* XXX: need to flush to get prim_vbuf.c to release its allocation??
 235     */
 236    draw_do_flush( draw, DRAW_FLUSH_BACKEND );
 237
 238    if (fetch_count >= UNDEFINED_VERTEX_ID) {
 239       assert(0);
 240       return;
 241    }
 242
 243    draw->render->allocate_vertices( draw->render,
 244                                     (ushort)feme->translate->key.output_stride,
 245                                     (ushort)fetch_count );
 246
 247    hw_verts = draw->render->map_vertices( draw->render );
 248    if (!hw_verts) {
 249       assert(0);
 250       return;
 251    }
 252
 253
 254    /* Single routine to fetch vertices and emit HW verts.
 255     */
 256    feme->translate->run_elts( feme->translate,
 257                               fetch_elts,
 258                               fetch_count,
 259                               hw_verts );
 260
 261    if (0) {
 262       unsigned i;
 263       for (i = 0; i < fetch_count; i++) {
 264          debug_printf("\n\nvertex %d:\n", i);
 265          draw_dump_emitted_vertex( feme->vinfo,
 266                                    (const uint8_t *)hw_verts + feme->vinfo->size * 4 * i );
 267       }
 268    }
 269
 270    draw->render->unmap_vertices( draw->render,
 271                                  0,
 272                                  (ushort)(fetch_count - 1) );
 273
 274    /* XXX: Draw arrays path to avoid re-emitting index list again and
 275     * again.
 276     */
 277    draw->render->draw( draw->render,
 278                        draw_elts,
 279                        draw_count );
 280
 281    /* Done -- that was easy, wasn't it:
 282     */
 283    draw->render->release_vertices( draw->render );
 284
 285 }
 286
 287
 288 static void fetch_emit_run_linear( struct draw_pt_middle_end *middle,
 289                                    unsigned start,
 290                                    unsigned count )
 291 {
 292    struct fetch_emit_middle_end *feme = (struct fetch_emit_middle_end *)middle;
 293    struct draw_context *draw = feme->draw;
 294    void *hw_verts;
 295
 296    /* XXX: need to flush to get prim_vbuf.c to release its allocation??
 297     */
 298    draw_do_flush( draw, DRAW_FLUSH_BACKEND );
 299
 300    if (count >= UNDEFINED_VERTEX_ID)
 301       goto fail;
 302
 303    if (!draw->render->allocate_vertices( draw->render,
 304                                          (ushort)feme->translate->key.output_stride,
 305                                          (ushort)count ))
 306       goto fail;
 307
 308    hw_verts = draw->render->map_vertices( draw->render );
 309    if (!hw_verts)
 310       goto fail;
 311
 312    /* Single routine to fetch vertices and emit HW verts.
 313     */
 314    feme->translate->run( feme->translate,
 315                          start,
 316                          count,
 317                          hw_verts );
 318
 319    if (0) {
 320       unsigned i;
 321       for (i = 0; i < count; i++) {
 322          debug_printf("\n\nvertex %d:\n", i);
 323          draw_dump_emitted_vertex( feme->vinfo,
 324                                    (const uint8_t *)hw_verts + feme->vinfo->size * 4 * i );
 325       }
 326    }
 327
 328    draw->render->unmap_vertices( draw->render, 0, count - 1 );
 329
 330    /* XXX: Draw arrays path to avoid re-emitting index list again and
 331     * again.
 332     */
 333    draw->render->draw_arrays( draw->render, 0, count );
 334
 335    /* Done -- that was easy, wasn't it:
 336     */
 337    draw->render->release_vertices( draw->render );
 338    return;
 339
 340 fail:
 341    assert(0);
 342    return;
 343 }
 344
 345
 346 static boolean fetch_emit_run_linear_elts( struct draw_pt_middle_end *middle,
 347                                         unsigned start,
 348                                         unsigned count,
 349                                         const ushort *draw_elts,
 350                                         unsigned draw_count )
 351 {
 352    struct fetch_emit_middle_end *feme = (struct fetch_emit_middle_end *)middle;
 353    struct draw_context *draw = feme->draw;
 354    void *hw_verts;
 355
 356    /* XXX: need to flush to get prim_vbuf.c to release its allocation??
 357     */
 358    draw_do_flush( draw, DRAW_FLUSH_BACKEND );
 359
 360    if (count >= UNDEFINED_VERTEX_ID)
 361       return FALSE;
 362
 363    if (!draw->render->allocate_vertices( draw->render,
 364                                          (ushort)feme->translate->key.output_stride,
 365                                          (ushort)count ))
 366       return FALSE;
 367
 368    hw_verts = draw->render->map_vertices( draw->render );
 369    if (!hw_verts)
 370       return FALSE;
 371
 372    /* Single routine to fetch vertices and emit HW verts.
 373     */
 374    feme->translate->run( feme->translate,
 375                          start,
 376                          count,
 377                          hw_verts );
 378
 379    draw->render->unmap_vertices( draw->render, 0, (ushort)(count - 1) );
 380
 381    /* XXX: Draw arrays path to avoid re-emitting index list again and
 382     * again.
 383     */
 384    draw->render->draw( draw->render,
 385                        draw_elts,
 386                        draw_count );
 387
 388    /* Done -- that was easy, wasn't it:
 389     */
 390    draw->render->release_vertices( draw->render );
 391
 392    return TRUE;
 393 }
 394
 395
 396
 397
 398 static void fetch_emit_finish( struct draw_pt_middle_end *middle )
 399 {
 400    /* nothing to do */
 401 }
 402
 403 static void fetch_emit_destroy( struct draw_pt_middle_end *middle )
 404 {
 405    struct fetch_emit_middle_end *feme = (struct fetch_emit_middle_end *)middle;
 406
 407    if (feme->cache)
 408       translate_cache_destroy(feme->cache);
 409
 410    FREE(middle);
 411 }
 412
 413
 414 struct draw_pt_middle_end *draw_pt_fetch_emit( struct draw_context *draw )
 415 {
 416    struct fetch_emit_middle_end *fetch_emit = CALLOC_STRUCT( fetch_emit_middle_end );
 417    if (fetch_emit == NULL)
 418       return NULL;
 419
 420    fetch_emit->cache = translate_cache_create();
 421    if (!fetch_emit->cache) {
 422       FREE(fetch_emit);
 423       return NULL;
 424    }
 425
 426    fetch_emit->base.prepare    = fetch_emit_prepare;
 427    fetch_emit->base.run        = fetch_emit_run;
 428    fetch_emit->base.run_linear = fetch_emit_run_linear;
 429    fetch_emit->base.run_linear_elts = fetch_emit_run_linear_elts;
 430    fetch_emit->base.finish     = fetch_emit_finish;
 431    fetch_emit->base.destroy    = fetch_emit_destroy;
 432
 433    fetch_emit->draw = draw;
 434
 435    return &fetch_emit->base;
 436 }
 437