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       output_format = draw_translate_vinfo_format(vinfo->attrib[i].emit);
 133       emit_sz = draw_translate_vinfo_size(vinfo->attrib[i].emit);
 134
 135       if (vinfo->attrib[i].emit == EMIT_OMIT)
 136          continue;
 137
 138       if (vinfo->attrib[i].emit == EMIT_1F_PSIZE) {
 139          input_format = PIPE_FORMAT_R32_FLOAT;
 140          input_buffer = draw->pt.nr_vertex_buffers;
 141          input_offset = 0;
 142       }
 143
 144       key.element[i].type = TRANSLATE_ELEMENT_NORMAL;
 145       key.element[i].input_format = input_format;
 146       key.element[i].input_buffer = input_buffer;
 147       key.element[i].input_offset = input_offset;
 148       key.element[i].instance_divisor = src->instance_divisor;
 149       key.element[i].output_format = output_format;
 150       key.element[i].output_offset = dst_offset;
 151
 152       dst_offset += emit_sz;
 153    }
 154
 155    key.nr_elements = vinfo->num_attribs;
 156    key.output_stride = vinfo->size * 4;
 157
 158    /* Don't bother with caching at this stage:
 159     */
 160    if (!feme->translate ||
 161        translate_key_compare(&feme->translate->key, &key) != 0)
 162    {
 163       translate_key_sanitize(&key);
 164       feme->translate = translate_cache_find(feme->cache,
 165                                              &key);
 166
 167
 168       feme->translate->set_buffer(feme->translate,
 169                                   draw->pt.nr_vertex_buffers,
 170                                   &feme->point_size,
 171                                   0);
 172    }
 173
 174    feme->point_size = draw->rasterizer->point_size;
 175
 176    for (i = 0; i < draw->pt.nr_vertex_buffers; i++) {
 177       feme->translate->set_buffer(feme->translate,
 178                                   i,
 179                                   ((char *)draw->pt.user.vbuffer[i] +
 180                                    draw->pt.vertex_buffer[i].buffer_offset),
 181                                   draw->pt.vertex_buffer[i].stride );
 182    }
 183
 184    *max_vertices = (draw->render->max_vertex_buffer_bytes /
 185                     (vinfo->size * 4));
 186
 187    /* Return an even number of verts.
 188     * This prevents "parity" errors when splitting long triangle strips which
 189     * can lead to front/back culling mix-ups.
 190     * Every other triangle in a strip has an alternate front/back orientation
 191     * so splitting at an odd position can cause the orientation of subsequent
 192     * triangles to get reversed.
 193     */
 194    *max_vertices = *max_vertices & ~1;
 195 }
 196
 197
 198
 199
 200
 201 static void fetch_emit_run( struct draw_pt_middle_end *middle,
 202                             const unsigned *fetch_elts,
 203                             unsigned fetch_count,
 204                             const ushort *draw_elts,
 205                             unsigned draw_count )
 206 {
 207    struct fetch_emit_middle_end *feme = (struct fetch_emit_middle_end *)middle;
 208    struct draw_context *draw = feme->draw;
 209    void *hw_verts;
 210
 211    /* XXX: need to flush to get prim_vbuf.c to release its allocation??
 212     */
 213    draw_do_flush( draw, DRAW_FLUSH_BACKEND );
 214
 215    if (fetch_count >= UNDEFINED_VERTEX_ID) {
 216       assert(0);
 217       return;
 218    }
 219
 220    draw->render->allocate_vertices( draw->render,
 221                                     (ushort)feme->translate->key.output_stride,
 222                                     (ushort)fetch_count );
 223
 224    hw_verts = draw->render->map_vertices( draw->render );
 225    if (!hw_verts) {
 226       assert(0);
 227       return;
 228    }
 229
 230
 231    /* Single routine to fetch vertices and emit HW verts.
 232     */
 233    feme->translate->run_elts( feme->translate,
 234                               fetch_elts,
 235                               fetch_count,
 236                               draw->instance_id,
 237                               hw_verts );
 238
 239    if (0) {
 240       unsigned i;
 241       for (i = 0; i < fetch_count; i++) {
 242          debug_printf("\n\nvertex %d:\n", i);
 243          draw_dump_emitted_vertex( feme->vinfo,
 244                                    (const uint8_t *)hw_verts + feme->vinfo->size * 4 * i );
 245       }
 246    }
 247
 248    draw->render->unmap_vertices( draw->render,
 249                                  0,
 250                                  (ushort)(fetch_count - 1) );
 251
 252    /* XXX: Draw arrays path to avoid re-emitting index list again and
 253     * again.
 254     */
 255    draw->render->draw( draw->render,
 256                        draw_elts,
 257                        draw_count );
 258
 259    /* Done -- that was easy, wasn't it:
 260     */
 261    draw->render->release_vertices( draw->render );
 262
 263 }
 264
 265
 266 static void fetch_emit_run_linear( struct draw_pt_middle_end *middle,
 267                                    unsigned start,
 268                                    unsigned count )
 269 {
 270    struct fetch_emit_middle_end *feme = (struct fetch_emit_middle_end *)middle;
 271    struct draw_context *draw = feme->draw;
 272    void *hw_verts;
 273
 274    /* XXX: need to flush to get prim_vbuf.c to release its allocation??
 275     */
 276    draw_do_flush( draw, DRAW_FLUSH_BACKEND );
 277
 278    if (count >= UNDEFINED_VERTEX_ID)
 279       goto fail;
 280
 281    if (!draw->render->allocate_vertices( draw->render,
 282                                          (ushort)feme->translate->key.output_stride,
 283                                          (ushort)count ))
 284       goto fail;
 285
 286    hw_verts = draw->render->map_vertices( draw->render );
 287    if (!hw_verts)
 288       goto fail;
 289
 290    /* Single routine to fetch vertices and emit HW verts.
 291     */
 292    feme->translate->run( feme->translate,
 293                          start,
 294                          count,
 295                          draw->instance_id,
 296                          hw_verts );
 297
 298    if (0) {
 299       unsigned i;
 300       for (i = 0; i < count; i++) {
 301          debug_printf("\n\nvertex %d:\n", i);
 302          draw_dump_emitted_vertex( feme->vinfo,
 303                                    (const uint8_t *)hw_verts + feme->vinfo->size * 4 * i );
 304       }
 305    }
 306
 307    draw->render->unmap_vertices( draw->render, 0, count - 1 );
 308
 309    /* XXX: Draw arrays path to avoid re-emitting index list again and
 310     * again.
 311     */
 312    draw->render->draw_arrays( draw->render, 0, count );
 313
 314    /* Done -- that was easy, wasn't it:
 315     */
 316    draw->render->release_vertices( draw->render );
 317    return;
 318
 319 fail:
 320    assert(0);
 321    return;
 322 }
 323
 324
 325 static boolean fetch_emit_run_linear_elts( struct draw_pt_middle_end *middle,
 326                                         unsigned start,
 327                                         unsigned count,
 328                                         const ushort *draw_elts,
 329                                         unsigned draw_count )
 330 {
 331    struct fetch_emit_middle_end *feme = (struct fetch_emit_middle_end *)middle;
 332    struct draw_context *draw = feme->draw;
 333    void *hw_verts;
 334
 335    /* XXX: need to flush to get prim_vbuf.c to release its allocation??
 336     */
 337    draw_do_flush( draw, DRAW_FLUSH_BACKEND );
 338
 339    if (count >= UNDEFINED_VERTEX_ID)
 340       return FALSE;
 341
 342    if (!draw->render->allocate_vertices( draw->render,
 343                                          (ushort)feme->translate->key.output_stride,
 344                                          (ushort)count ))
 345       return FALSE;
 346
 347    hw_verts = draw->render->map_vertices( draw->render );
 348    if (!hw_verts)
 349       return FALSE;
 350
 351    /* Single routine to fetch vertices and emit HW verts.
 352     */
 353    feme->translate->run( feme->translate,
 354                          start,
 355                          count,
 356                          draw->instance_id,
 357                          hw_verts );
 358
 359    draw->render->unmap_vertices( draw->render, 0, (ushort)(count - 1) );
 360
 361    /* XXX: Draw arrays path to avoid re-emitting index list again and
 362     * again.
 363     */
 364    draw->render->draw( draw->render,
 365                        draw_elts,
 366                        draw_count );
 367
 368    /* Done -- that was easy, wasn't it:
 369     */
 370    draw->render->release_vertices( draw->render );
 371
 372    return TRUE;
 373 }
 374
 375
 376
 377
 378 static void fetch_emit_finish( struct draw_pt_middle_end *middle )
 379 {
 380    /* nothing to do */
 381 }
 382
 383 static void fetch_emit_destroy( struct draw_pt_middle_end *middle )
 384 {
 385    struct fetch_emit_middle_end *feme = (struct fetch_emit_middle_end *)middle;
 386
 387    if (feme->cache)
 388       translate_cache_destroy(feme->cache);
 389
 390    FREE(middle);
 391 }
 392
 393
 394 struct draw_pt_middle_end *draw_pt_fetch_emit( struct draw_context *draw )
 395 {
 396    struct fetch_emit_middle_end *fetch_emit = CALLOC_STRUCT( fetch_emit_middle_end );
 397    if (fetch_emit == NULL)
 398       return NULL;
 399
 400    fetch_emit->cache = translate_cache_create();
 401    if (!fetch_emit->cache) {
 402       FREE(fetch_emit);
 403       return NULL;
 404    }
 405
 406    fetch_emit->base.prepare    = fetch_emit_prepare;
 407    fetch_emit->base.run        = fetch_emit_run;
 408    fetch_emit->base.run_linear = fetch_emit_run_linear;
 409    fetch_emit->base.run_linear_elts = fetch_emit_run_linear_elts;
 410    fetch_emit->base.finish     = fetch_emit_finish;
 411    fetch_emit->base.destroy    = fetch_emit_destroy;
 412
 413    fetch_emit->draw = draw;
 414
 415    return &fetch_emit->base;
 416 }
 417