src/gallium/auxiliary/draw/draw_pt_fetch_emit.c

   1 /**************************************************************************
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   3  * Copyright 2007 VMware, Inc.
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  11  * permit persons to whom the Software is furnished to do so, subject to
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  13  *
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  15  * next paragraph) shall be included in all copies or substantial portions
  16  * of the Software.
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  18  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
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  27
  28  /*
  29   * Authors:
  30   *   Keith Whitwell <keithw@vmware.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 "draw/draw_gs.h"
  40 #include "translate/translate.h"
  41 #include "translate/translate_cache.h"
  42
  43 /* The simplest 'middle end' in the new vertex code.
  44  *
  45  * The responsibilities of a middle end are to:
  46  *  - perform vertex fetch using
  47  *       - draw vertex element/buffer state
  48  *       - a list of fetch indices we received as an input
  49  *  - run the vertex shader
  50  *  - cliptest,
  51  *  - clip coord calculation
  52  *  - viewport transformation
  53  *  - if necessary, run the primitive pipeline, passing it:
  54  *       - a linear array of vertex_header vertices constructed here
  55  *       - a set of draw indices we received as an input
  56  *  - otherwise, drive the hw backend,
  57  *       - allocate space for hardware format vertices
  58  *       - translate the vertex-shader output vertices to hw format
  59  *       - calling the backend draw functions.
  60  *
  61  * For convenience, we provide a helper function to drive the hardware
  62  * backend given similar inputs to those required to run the pipeline.
  63  *
  64  * In the case of passthrough mode, many of these actions are disabled
  65  * or noops, so we end up doing:
  66  *
  67  *  - perform vertex fetch
  68  *  - drive the hw backend
  69  *
  70  * IE, basically just vertex fetch to post-vs-format vertices,
  71  * followed by a call to the backend helper function.
  72  */
  73
  74
  75 struct fetch_emit_middle_end {
  76    struct draw_pt_middle_end base;
  77    struct draw_context *draw;
  78
  79    struct translate *translate;
  80    const struct vertex_info *vinfo;
  81
  82    /* Cache point size somewhere it's address won't change:
  83     */
  84    float point_size;
  85
  86    struct translate_cache *cache;
  87 };
  88
  89
  90 static void fetch_emit_prepare( struct draw_pt_middle_end *middle,
  91                                 unsigned prim,
  92                                 unsigned opt,
  93                                 unsigned *max_vertices )
  94 {
  95    struct fetch_emit_middle_end *feme = (struct fetch_emit_middle_end *)middle;
  96    struct draw_context *draw = feme->draw;
  97    const struct vertex_info *vinfo;
  98    unsigned i, dst_offset;
  99    struct translate_key key;
 100    unsigned gs_out_prim = (draw->gs.geometry_shader ?
 101                            draw->gs.geometry_shader->output_primitive :
 102                            prim);
 103
 104    draw->render->set_primitive(draw->render, gs_out_prim);
 105
 106    /* Must do this after set_primitive() above:
 107     */
 108    vinfo = feme->vinfo = draw->render->get_vertex_info(draw->render);
 109
 110    /* Transform from API vertices to HW vertices, skipping the
 111     * pipeline_vertex intermediate step.
 112     */
 113    dst_offset = 0;
 114    memset(&key, 0, sizeof(key));
 115
 116    for (i = 0; i < vinfo->num_attribs; i++) {
 117       const struct pipe_vertex_element *src = &draw->pt.vertex_element[vinfo->attrib[i].src_index];
 118
 119       unsigned emit_sz = 0;
 120       unsigned input_format = src->src_format;
 121       unsigned input_buffer = src->vertex_buffer_index;
 122       unsigned input_offset = src->src_offset;
 123       unsigned output_format;
 124
 125       output_format = draw_translate_vinfo_format(vinfo->attrib[i].emit);
 126       emit_sz = draw_translate_vinfo_size(vinfo->attrib[i].emit);
 127
 128       if (vinfo->attrib[i].emit == EMIT_OMIT)
 129          continue;
 130
 131       if (vinfo->attrib[i].emit == EMIT_1F_PSIZE) {
 132          input_format = PIPE_FORMAT_R32_FLOAT;
 133          input_buffer = draw->pt.nr_vertex_buffers;
 134          input_offset = 0;
 135       }
 136
 137       key.element[i].type = TRANSLATE_ELEMENT_NORMAL;
 138       key.element[i].input_format = input_format;
 139       key.element[i].input_buffer = input_buffer;
 140       key.element[i].input_offset = input_offset;
 141       key.element[i].instance_divisor = src->instance_divisor;
 142       key.element[i].output_format = output_format;
 143       key.element[i].output_offset = dst_offset;
 144
 145       dst_offset += emit_sz;
 146    }
 147
 148    key.nr_elements = vinfo->num_attribs;
 149    key.output_stride = vinfo->size * 4;
 150
 151    /* Don't bother with caching at this stage:
 152     */
 153    if (!feme->translate ||
 154        translate_key_compare(&feme->translate->key, &key) != 0)
 155    {
 156       translate_key_sanitize(&key);
 157       feme->translate = translate_cache_find(feme->cache,
 158                                              &key);
 159
 160       feme->translate->set_buffer(feme->translate,
 161                                   draw->pt.nr_vertex_buffers,
 162                                   &feme->point_size,
 163                                   0,
 164                                   ~0);
 165    }
 166
 167    feme->point_size = draw->rasterizer->point_size;
 168
 169    for (i = 0; i < draw->pt.nr_vertex_buffers; i++) {
 170       feme->translate->set_buffer(feme->translate,
 171                                   i,
 172                                   ((char *)draw->pt.user.vbuffer[i].map +
 173                                    draw->pt.vertex_buffer[i].buffer_offset),
 174                                   draw->pt.vertex_buffer[i].stride,
 175                                   draw->pt.max_index);
 176    }
 177
 178    *max_vertices = (draw->render->max_vertex_buffer_bytes /
 179                     (vinfo->size * 4));
 180 }
 181
 182
 183 static void
 184 fetch_emit_bind_parameters(struct draw_pt_middle_end *middle)
 185 {
 186    /* No-op? */
 187 }
 188
 189
 190 static void fetch_emit_run( struct draw_pt_middle_end *middle,
 191                             const unsigned *fetch_elts,
 192                             unsigned fetch_count,
 193                             const ushort *draw_elts,
 194                             unsigned draw_count,
 195                             unsigned prim_flags )
 196 {
 197    struct fetch_emit_middle_end *feme = (struct fetch_emit_middle_end *)middle;
 198    struct draw_context *draw = feme->draw;
 199    void *hw_verts;
 200
 201    /* XXX: need to flush to get prim_vbuf.c to release its allocation??
 202     */
 203    draw_do_flush( draw, DRAW_FLUSH_BACKEND );
 204
 205    draw->render->allocate_vertices( draw->render,
 206                                     (ushort)feme->translate->key.output_stride,
 207                                     (ushort)fetch_count );
 208
 209    hw_verts = draw->render->map_vertices( draw->render );
 210    if (!hw_verts) {
 211       debug_warn_once("vertex buffer allocation failed (out of memory?)");
 212       return;
 213    }
 214
 215    /* Single routine to fetch vertices and emit HW verts.
 216     */
 217    feme->translate->run_elts( feme->translate,
 218                               fetch_elts,
 219                               fetch_count,
 220                               draw->start_instance,
 221                               draw->instance_id,
 222                               hw_verts );
 223
 224    if (0) {
 225       unsigned i;
 226       for (i = 0; i < fetch_count; i++) {
 227          debug_printf("\n\nvertex %d:\n", i);
 228          draw_dump_emitted_vertex( feme->vinfo,
 229                                    (const uint8_t *)hw_verts + feme->vinfo->size * 4 * i );
 230       }
 231    }
 232
 233    draw->render->unmap_vertices( draw->render,
 234                                  0,
 235                                  (ushort)(fetch_count - 1) );
 236
 237    /* XXX: Draw arrays path to avoid re-emitting index list again and
 238     * again.
 239     */
 240    draw->render->draw_elements( draw->render,
 241                                 draw_elts,
 242                                 draw_count );
 243
 244    /* Done -- that was easy, wasn't it:
 245     */
 246    draw->render->release_vertices( draw->render );
 247
 248 }
 249
 250
 251 static void fetch_emit_run_linear( struct draw_pt_middle_end *middle,
 252                                    unsigned start,
 253                                    unsigned count,
 254                                    unsigned prim_flags )
 255 {
 256    struct fetch_emit_middle_end *feme = (struct fetch_emit_middle_end *)middle;
 257    struct draw_context *draw = feme->draw;
 258    void *hw_verts;
 259
 260    /* XXX: need to flush to get prim_vbuf.c to release its allocation??
 261     */
 262    draw_do_flush( draw, DRAW_FLUSH_BACKEND );
 263
 264    if (!draw->render->allocate_vertices( draw->render,
 265                                          (ushort)feme->translate->key.output_stride,
 266                                          (ushort)count ))
 267       goto fail;
 268
 269    hw_verts = draw->render->map_vertices( draw->render );
 270    if (!hw_verts)
 271       goto fail;
 272
 273    /* Single routine to fetch vertices and emit HW verts.
 274     */
 275    feme->translate->run( feme->translate,
 276                          start,
 277                          count,
 278                          draw->start_instance,
 279                          draw->instance_id,
 280                          hw_verts );
 281
 282    if (0) {
 283       unsigned i;
 284       for (i = 0; i < count; i++) {
 285          debug_printf("\n\nvertex %d:\n", i);
 286          draw_dump_emitted_vertex( feme->vinfo,
 287                                    (const uint8_t *)hw_verts + feme->vinfo->size * 4 * i );
 288       }
 289    }
 290
 291    draw->render->unmap_vertices( draw->render, 0, count - 1 );
 292
 293    /* XXX: Draw arrays path to avoid re-emitting index list again and
 294     * again.
 295     */
 296    draw->render->draw_arrays( draw->render, 0, count );
 297
 298    /* Done -- that was easy, wasn't it:
 299     */
 300    draw->render->release_vertices( draw->render );
 301    return;
 302
 303 fail:
 304    debug_warn_once("allocate or map of vertex buffer failed (out of memory?)");
 305    return;
 306 }
 307
 308
 309 static boolean fetch_emit_run_linear_elts( struct draw_pt_middle_end *middle,
 310                                         unsigned start,
 311                                         unsigned count,
 312                                         const ushort *draw_elts,
 313                                         unsigned draw_count,
 314                                         unsigned prim_flags )
 315 {
 316    struct fetch_emit_middle_end *feme = (struct fetch_emit_middle_end *)middle;
 317    struct draw_context *draw = feme->draw;
 318    void *hw_verts;
 319
 320    /* XXX: need to flush to get prim_vbuf.c to release its allocation??
 321     */
 322    draw_do_flush( draw, DRAW_FLUSH_BACKEND );
 323
 324    if (!draw->render->allocate_vertices( draw->render,
 325                                          (ushort)feme->translate->key.output_stride,
 326                                          (ushort)count ))
 327       return FALSE;
 328
 329    hw_verts = draw->render->map_vertices( draw->render );
 330    if (!hw_verts)
 331       return FALSE;
 332
 333    /* Single routine to fetch vertices and emit HW verts.
 334     */
 335    feme->translate->run( feme->translate,
 336                          start,
 337                          count,
 338                          draw->start_instance,
 339                          draw->instance_id,
 340                          hw_verts );
 341
 342    draw->render->unmap_vertices( draw->render, 0, (ushort)(count - 1) );
 343
 344    /* XXX: Draw arrays path to avoid re-emitting index list again and
 345     * again.
 346     */
 347    draw->render->draw_elements( draw->render,
 348                                 draw_elts,
 349                                 draw_count );
 350
 351    /* Done -- that was easy, wasn't it:
 352     */
 353    draw->render->release_vertices( draw->render );
 354
 355    return TRUE;
 356 }
 357
 358
 359 static void fetch_emit_finish( struct draw_pt_middle_end *middle )
 360 {
 361    /* nothing to do */
 362 }
 363
 364
 365 static void fetch_emit_destroy( struct draw_pt_middle_end *middle )
 366 {
 367    struct fetch_emit_middle_end *feme = (struct fetch_emit_middle_end *)middle;
 368
 369    if (feme->cache)
 370       translate_cache_destroy(feme->cache);
 371
 372    FREE(middle);
 373 }
 374
 375
 376 struct draw_pt_middle_end *draw_pt_fetch_emit( struct draw_context *draw )
 377 {
 378    struct fetch_emit_middle_end *fetch_emit = CALLOC_STRUCT( fetch_emit_middle_end );
 379    if (!fetch_emit)
 380       return NULL;
 381
 382    fetch_emit->cache = translate_cache_create();
 383    if (!fetch_emit->cache) {
 384       FREE(fetch_emit);
 385       return NULL;
 386    }
 387
 388    fetch_emit->base.prepare    = fetch_emit_prepare;
 389    fetch_emit->base.bind_parameters = fetch_emit_bind_parameters;
 390    fetch_emit->base.run        = fetch_emit_run;
 391    fetch_emit->base.run_linear = fetch_emit_run_linear;
 392    fetch_emit->base.run_linear_elts = fetch_emit_run_linear_elts;
 393    fetch_emit->base.finish     = fetch_emit_finish;
 394    fetch_emit->base.destroy    = fetch_emit_destroy;
 395
 396    fetch_emit->draw = draw;
 397
 398    return &fetch_emit->base;
 399 }
 400