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
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  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].instance_divisor = src->instance_divisor;
 173       key.element[i].output_format = output_format;
 174       key.element[i].output_offset = dst_offset;
 175
 176       dst_offset += emit_sz;
 177    }
 178
 179    key.nr_elements = vinfo->num_attribs;
 180    key.output_stride = vinfo->size * 4;
 181
 182    /* Don't bother with caching at this stage:
 183     */
 184    if (!feme->translate ||
 185        translate_key_compare(&feme->translate->key, &key) != 0)
 186    {
 187       translate_key_sanitize(&key);
 188       feme->translate = translate_cache_find(feme->cache,
 189                                              &key);
 190
 191
 192       feme->translate->set_buffer(feme->translate,
 193                                   draw->pt.nr_vertex_buffers,
 194                                   &feme->point_size,
 195                                   0);
 196    }
 197
 198    feme->point_size = draw->rasterizer->point_size;
 199
 200    for (i = 0; i < draw->pt.nr_vertex_buffers; i++) {
 201       feme->translate->set_buffer(feme->translate,
 202                                   i,
 203                                   ((char *)draw->pt.user.vbuffer[i] +
 204                                    draw->pt.vertex_buffer[i].buffer_offset),
 205                                   draw->pt.vertex_buffer[i].stride );
 206    }
 207
 208    *max_vertices = (draw->render->max_vertex_buffer_bytes /
 209                     (vinfo->size * 4));
 210
 211    /* Return an even number of verts.
 212     * This prevents "parity" errors when splitting long triangle strips which
 213     * can lead to front/back culling mix-ups.
 214     * Every other triangle in a strip has an alternate front/back orientation
 215     * so splitting at an odd position can cause the orientation of subsequent
 216     * triangles to get reversed.
 217     */
 218    *max_vertices = *max_vertices & ~1;
 219 }
 220
 221
 222
 223
 224
 225 static void fetch_emit_run( struct draw_pt_middle_end *middle,
 226                             const unsigned *fetch_elts,
 227                             unsigned fetch_count,
 228                             const ushort *draw_elts,
 229                             unsigned draw_count )
 230 {
 231    struct fetch_emit_middle_end *feme = (struct fetch_emit_middle_end *)middle;
 232    struct draw_context *draw = feme->draw;
 233    void *hw_verts;
 234
 235    /* XXX: need to flush to get prim_vbuf.c to release its allocation??
 236     */
 237    draw_do_flush( draw, DRAW_FLUSH_BACKEND );
 238
 239    if (fetch_count >= UNDEFINED_VERTEX_ID) {
 240       assert(0);
 241       return;
 242    }
 243
 244    draw->render->allocate_vertices( draw->render,
 245                                     (ushort)feme->translate->key.output_stride,
 246                                     (ushort)fetch_count );
 247
 248    hw_verts = draw->render->map_vertices( draw->render );
 249    if (!hw_verts) {
 250       assert(0);
 251       return;
 252    }
 253
 254
 255    /* Single routine to fetch vertices and emit HW verts.
 256     */
 257    feme->translate->run_elts( feme->translate,
 258                               fetch_elts,
 259                               fetch_count,
 260                               draw->instance_id,
 261                               hw_verts );
 262
 263    if (0) {
 264       unsigned i;
 265       for (i = 0; i < fetch_count; i++) {
 266          debug_printf("\n\nvertex %d:\n", i);
 267          draw_dump_emitted_vertex( feme->vinfo,
 268                                    (const uint8_t *)hw_verts + feme->vinfo->size * 4 * i );
 269       }
 270    }
 271
 272    draw->render->unmap_vertices( draw->render,
 273                                  0,
 274                                  (ushort)(fetch_count - 1) );
 275
 276    /* XXX: Draw arrays path to avoid re-emitting index list again and
 277     * again.
 278     */
 279    draw->render->draw( draw->render,
 280                        draw_elts,
 281                        draw_count );
 282
 283    /* Done -- that was easy, wasn't it:
 284     */
 285    draw->render->release_vertices( draw->render );
 286
 287 }
 288
 289
 290 static void fetch_emit_run_linear( struct draw_pt_middle_end *middle,
 291                                    unsigned start,
 292                                    unsigned count )
 293 {
 294    struct fetch_emit_middle_end *feme = (struct fetch_emit_middle_end *)middle;
 295    struct draw_context *draw = feme->draw;
 296    void *hw_verts;
 297
 298    /* XXX: need to flush to get prim_vbuf.c to release its allocation??
 299     */
 300    draw_do_flush( draw, DRAW_FLUSH_BACKEND );
 301
 302    if (count >= UNDEFINED_VERTEX_ID)
 303       goto fail;
 304
 305    if (!draw->render->allocate_vertices( draw->render,
 306                                          (ushort)feme->translate->key.output_stride,
 307                                          (ushort)count ))
 308       goto fail;
 309
 310    hw_verts = draw->render->map_vertices( draw->render );
 311    if (!hw_verts)
 312       goto fail;
 313
 314    /* Single routine to fetch vertices and emit HW verts.
 315     */
 316    feme->translate->run( feme->translate,
 317                          start,
 318                          count,
 319                          draw->instance_id,
 320                          hw_verts );
 321
 322    if (0) {
 323       unsigned i;
 324       for (i = 0; i < count; i++) {
 325          debug_printf("\n\nvertex %d:\n", i);
 326          draw_dump_emitted_vertex( feme->vinfo,
 327                                    (const uint8_t *)hw_verts + feme->vinfo->size * 4 * i );
 328       }
 329    }
 330
 331    draw->render->unmap_vertices( draw->render, 0, count - 1 );
 332
 333    /* XXX: Draw arrays path to avoid re-emitting index list again and
 334     * again.
 335     */
 336    draw->render->draw_arrays( draw->render, 0, count );
 337
 338    /* Done -- that was easy, wasn't it:
 339     */
 340    draw->render->release_vertices( draw->render );
 341    return;
 342
 343 fail:
 344    assert(0);
 345    return;
 346 }
 347
 348
 349 static boolean fetch_emit_run_linear_elts( struct draw_pt_middle_end *middle,
 350                                         unsigned start,
 351                                         unsigned count,
 352                                         const ushort *draw_elts,
 353                                         unsigned draw_count )
 354 {
 355    struct fetch_emit_middle_end *feme = (struct fetch_emit_middle_end *)middle;
 356    struct draw_context *draw = feme->draw;
 357    void *hw_verts;
 358
 359    /* XXX: need to flush to get prim_vbuf.c to release its allocation??
 360     */
 361    draw_do_flush( draw, DRAW_FLUSH_BACKEND );
 362
 363    if (count >= UNDEFINED_VERTEX_ID)
 364       return FALSE;
 365
 366    if (!draw->render->allocate_vertices( draw->render,
 367                                          (ushort)feme->translate->key.output_stride,
 368                                          (ushort)count ))
 369       return FALSE;
 370
 371    hw_verts = draw->render->map_vertices( draw->render );
 372    if (!hw_verts)
 373       return FALSE;
 374
 375    /* Single routine to fetch vertices and emit HW verts.
 376     */
 377    feme->translate->run( feme->translate,
 378                          start,
 379                          count,
 380                          draw->instance_id,
 381                          hw_verts );
 382
 383    draw->render->unmap_vertices( draw->render, 0, (ushort)(count - 1) );
 384
 385    /* XXX: Draw arrays path to avoid re-emitting index list again and
 386     * again.
 387     */
 388    draw->render->draw( draw->render,
 389                        draw_elts,
 390                        draw_count );
 391
 392    /* Done -- that was easy, wasn't it:
 393     */
 394    draw->render->release_vertices( draw->render );
 395
 396    return TRUE;
 397 }
 398
 399
 400
 401
 402 static void fetch_emit_finish( struct draw_pt_middle_end *middle )
 403 {
 404    /* nothing to do */
 405 }
 406
 407 static void fetch_emit_destroy( struct draw_pt_middle_end *middle )
 408 {
 409    struct fetch_emit_middle_end *feme = (struct fetch_emit_middle_end *)middle;
 410
 411    if (feme->cache)
 412       translate_cache_destroy(feme->cache);
 413
 414    FREE(middle);
 415 }
 416
 417
 418 struct draw_pt_middle_end *draw_pt_fetch_emit( struct draw_context *draw )
 419 {
 420    struct fetch_emit_middle_end *fetch_emit = CALLOC_STRUCT( fetch_emit_middle_end );
 421    if (fetch_emit == NULL)
 422       return NULL;
 423
 424    fetch_emit->cache = translate_cache_create();
 425    if (!fetch_emit->cache) {
 426       FREE(fetch_emit);
 427       return NULL;
 428    }
 429
 430    fetch_emit->base.prepare    = fetch_emit_prepare;
 431    fetch_emit->base.run        = fetch_emit_run;
 432    fetch_emit->base.run_linear = fetch_emit_run_linear;
 433    fetch_emit->base.run_linear_elts = fetch_emit_run_linear_elts;
 434    fetch_emit->base.finish     = fetch_emit_finish;
 435    fetch_emit->base.destroy    = fetch_emit_destroy;
 436
 437    fetch_emit->draw = draw;
 438
 439    return &fetch_emit->base;
 440 }
 441