src/gallium/auxiliary/draw/draw_pt_fetch_shade_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
  34 #include "pipe/p_util.h"
  35 #include "draw/draw_context.h"
  36 #include "draw/draw_private.h"
  37 #include "draw/draw_vbuf.h"
  38 #include "draw/draw_vertex.h"
  39 #include "draw/draw_pt.h"
  40 #include "draw/draw_vs.h"
  41
  42 #include "translate/translate.h"
  43
  44 struct fetch_shade_emit;
  45
  46
  47 /* Prototype fetch, shade, emit-hw-verts all in one go.
  48  */
  49 struct fetch_shade_emit {
  50    struct draw_pt_middle_end base;
  51    struct draw_context *draw;
  52
  53
  54    /* Temporaries:
  55     */
  56    const float *constants;
  57    unsigned pitch[PIPE_MAX_ATTRIBS];
  58    const ubyte *src[PIPE_MAX_ATTRIBS];
  59    unsigned prim;
  60
  61    struct draw_vs_varient_key key;
  62    struct draw_vs_varient *active;
  63
  64
  65    const struct vertex_info *vinfo;
  66 };
  67
  68
  69
  70
  71 static void fse_prepare( struct draw_pt_middle_end *middle,
  72                          unsigned prim,
  73                          unsigned opt,
  74                          unsigned *max_vertices )
  75 {
  76    struct fetch_shade_emit *fse = (struct fetch_shade_emit *)middle;
  77    struct draw_context *draw = fse->draw;
  78    unsigned num_vs_inputs = draw->vs.vertex_shader->info.num_inputs;
  79    const struct vertex_info *vinfo;
  80    unsigned i;
  81
  82
  83    if (!draw->render->set_primitive( draw->render,
  84                                      prim )) {
  85       assert(0);
  86       return;
  87    }
  88
  89    /* Must do this after set_primitive() above:
  90     */
  91    fse->vinfo = vinfo = draw->render->get_vertex_info(draw->render);
  92
  93
  94
  95    fse->key.output_stride = vinfo->size * 4;
  96    fse->key.nr_outputs = vinfo->num_attribs;
  97    fse->key.nr_inputs = num_vs_inputs;
  98
  99    fse->key.nr_elements = MAX2(fse->key.nr_outputs,     /* outputs - translate to hw format */
 100                                fse->key.nr_inputs);     /* inputs - fetch from api format */
 101
 102    fse->key.viewport = !draw->identity_viewport;
 103    fse->key.clip = !draw->bypass_clipping;
 104    fse->key.pad = 0;
 105
 106    memset(fse->key.element, 0,
 107           fse->key.nr_elements * sizeof(fse->key.element[0]));
 108
 109    for (i = 0; i < num_vs_inputs; i++) {
 110       const struct pipe_vertex_element *src = &draw->pt.vertex_element[i];
 111       fse->key.element[i].in.format = src->src_format;
 112
 113       /* Consider ignoring these, ie make generated programs
 114        * independent of this state:
 115        */
 116       fse->key.element[i].in.buffer = src->vertex_buffer_index;
 117       fse->key.element[i].in.offset = src->src_offset;
 118    }
 119
 120
 121    {
 122       unsigned dst_offset = 0;
 123
 124       for (i = 0; i < vinfo->num_attribs; i++) {
 125          unsigned emit_sz = 0;
 126
 127          switch (vinfo->emit[i]) {
 128          case EMIT_4F:
 129             emit_sz = 4 * sizeof(float);
 130             break;
 131          case EMIT_3F:
 132             emit_sz = 3 * sizeof(float);
 133             break;
 134          case EMIT_2F:
 135             emit_sz = 2 * sizeof(float);
 136             break;
 137          case EMIT_1F:
 138             emit_sz = 1 * sizeof(float);
 139             break;
 140          case EMIT_1F_PSIZE:
 141             emit_sz = 1 * sizeof(float);
 142             break;
 143          case EMIT_4UB:
 144             emit_sz = 4 * sizeof(ubyte);
 145             break;
 146          default:
 147             assert(0);
 148             break;
 149          }
 150
 151          /* The elements in the key correspond to vertex shader output
 152           * numbers, not to positions in the hw vertex description --
 153           * that's handled by the output_offset field.
 154           */
 155          fse->key.element[i].out.format = vinfo->emit[i];
 156          fse->key.element[i].out.vs_output = vinfo->src_index[i];
 157          fse->key.element[i].out.offset = dst_offset;
 158
 159          dst_offset += emit_sz;
 160          assert(fse->key.output_stride >= dst_offset);
 161       }
 162    }
 163
 164
 165    /* Would normally look up a vertex shader and peruse its list of
 166     * varients somehow.  We omitted that step and put all the
 167     * hardcoded "shaders" into an array.  We're just making the
 168     * assumption that this happens to be a matching shader...  ie
 169     * you're running isosurf, aren't you?
 170     */
 171    fse->active = draw_vs_lookup_varient( draw->vs.vertex_shader,
 172                                          &fse->key );
 173
 174    if (!fse->active) {
 175       assert(0);
 176       return ;
 177    }
 178
 179    /* Now set buffer pointers:
 180     */
 181    for (i = 0; i < num_vs_inputs; i++) {
 182       unsigned buf = draw->pt.vertex_element[i].vertex_buffer_index;
 183
 184       fse->active->set_input( fse->active,
 185                               i,
 186
 187                               ((const ubyte *) draw->pt.user.vbuffer[buf] +
 188                                draw->pt.vertex_buffer[buf].buffer_offset),
 189
 190                               draw->pt.vertex_buffer[buf].pitch );
 191    }
 192
 193    *max_vertices = (draw->render->max_vertex_buffer_bytes /
 194                     (vinfo->size * 4));
 195
 196    /* Return an even number of verts.
 197     * This prevents "parity" errors when splitting long triangle strips which
 198     * can lead to front/back culling mix-ups.
 199     * Every other triangle in a strip has an alternate front/back orientation
 200     * so splitting at an odd position can cause the orientation of subsequent
 201     * triangles to get reversed.
 202     */
 203    *max_vertices = *max_vertices & ~1;
 204
 205    /* Probably need to do this somewhere (or fix exec shader not to
 206     * need it):
 207     */
 208    if (1) {
 209       struct draw_vertex_shader *vs = draw->vs.vertex_shader;
 210       vs->prepare(vs, draw);
 211    }
 212
 213
 214    //return TRUE;
 215 }
 216
 217
 218
 219
 220
 221
 222
 223 static void fse_run_linear( struct draw_pt_middle_end *middle,
 224                             unsigned start,
 225                             unsigned count )
 226 {
 227    struct fetch_shade_emit *fse = (struct fetch_shade_emit *)middle;
 228    struct draw_context *draw = fse->draw;
 229    char *hw_verts;
 230
 231    /* XXX: need to flush to get prim_vbuf.c to release its allocation??
 232     */
 233    draw_do_flush( draw, DRAW_FLUSH_BACKEND );
 234
 235    hw_verts = draw->render->allocate_vertices( draw->render,
 236                                                (ushort)fse->key.output_stride,
 237                                                (ushort)count );
 238
 239    if (!hw_verts) {
 240       assert(0);
 241       return;
 242    }
 243
 244    /* Single routine to fetch vertices, run shader and emit HW verts.
 245     * Clipping is done elsewhere -- either by the API or on hardware,
 246     * or for some other reason not required...
 247     */
 248    fse->active->run_linear( fse->active,
 249                             start, count,
 250                             hw_verts );
 251
 252    /* Draw arrays path to avoid re-emitting index list again and
 253     * again.
 254     */
 255    draw->render->draw_arrays( draw->render,
 256                               0,
 257                               count );
 258
 259    if (0) {
 260       unsigned i;
 261       for (i = 0; i < count; i++) {
 262          debug_printf("\n\n%s vertex %d: (stride %d, offset %d)\n", __FUNCTION__, i,
 263                       fse->key.output_stride,
 264                       fse->key.output_stride * i);
 265
 266          draw_dump_emitted_vertex( fse->vinfo,
 267                                    (const uint8_t *)hw_verts + fse->key.output_stride * i );
 268       }
 269    }
 270
 271
 272    draw->render->release_vertices( draw->render,
 273                                    hw_verts,
 274                                    fse->key.output_stride,
 275                                    count );
 276 }
 277
 278
 279 static void
 280 fse_run(struct draw_pt_middle_end *middle,
 281         const unsigned *fetch_elts,
 282         unsigned fetch_count,
 283         const ushort *draw_elts,
 284         unsigned draw_count )
 285 {
 286    struct fetch_shade_emit *fse = (struct fetch_shade_emit *)middle;
 287    struct draw_context *draw = fse->draw;
 288    void *hw_verts;
 289
 290    /* XXX: need to flush to get prim_vbuf.c to release its allocation??
 291     */
 292    draw_do_flush( draw, DRAW_FLUSH_BACKEND );
 293
 294    hw_verts = draw->render->allocate_vertices( draw->render,
 295                                                (ushort)fse->key.output_stride,
 296                                                (ushort)fetch_count );
 297    if (!hw_verts) {
 298       assert(0);
 299       return;
 300    }
 301
 302
 303    /* Single routine to fetch vertices, run shader and emit HW verts.
 304     */
 305    fse->active->run_elts( fse->active,
 306                           fetch_elts,
 307                           fetch_count,
 308                           hw_verts );
 309
 310    draw->render->draw( draw->render,
 311                        draw_elts,
 312                        draw_count );
 313
 314    if (0) {
 315       unsigned i;
 316       for (i = 0; i < fetch_count; i++) {
 317          debug_printf("\n\n%s vertex %d:\n", __FUNCTION__, i);
 318          draw_dump_emitted_vertex( fse->vinfo,
 319                                    (const uint8_t *)hw_verts +
 320                                    fse->key.output_stride * i );
 321       }
 322    }
 323
 324
 325    draw->render->release_vertices( draw->render,
 326                                    hw_verts,
 327                                    fse->key.output_stride,
 328                                    fetch_count );
 329
 330 }
 331
 332
 333
 334 static void fse_run_linear_elts( struct draw_pt_middle_end *middle,
 335                                  unsigned start,
 336                                  unsigned count,
 337                                  const ushort *draw_elts,
 338                                  unsigned draw_count )
 339 {
 340    struct fetch_shade_emit *fse = (struct fetch_shade_emit *)middle;
 341    struct draw_context *draw = fse->draw;
 342    char *hw_verts;
 343
 344    /* XXX: need to flush to get prim_vbuf.c to release its allocation??
 345     */
 346    draw_do_flush( draw, DRAW_FLUSH_BACKEND );
 347
 348    hw_verts = draw->render->allocate_vertices( draw->render,
 349                                                (ushort)fse->key.output_stride,
 350                                                (ushort)count );
 351
 352    if (!hw_verts) {
 353       assert(0);
 354       return;
 355    }
 356
 357    /* Single routine to fetch vertices, run shader and emit HW verts.
 358     * Clipping is done elsewhere -- either by the API or on hardware,
 359     * or for some other reason not required...
 360     */
 361    fse->active->run_linear( fse->active,
 362                             start, count,
 363                             hw_verts );
 364
 365
 366    draw->render->draw( draw->render,
 367                        draw_elts,
 368                        draw_count );
 369
 370
 371
 372    draw->render->release_vertices( draw->render,
 373                                    hw_verts,
 374                                    fse->key.output_stride,
 375                                    count );
 376 }
 377
 378
 379
 380 static void fse_finish( struct draw_pt_middle_end *middle )
 381 {
 382 }
 383
 384
 385 static void
 386 fse_destroy( struct draw_pt_middle_end *middle )
 387 {
 388    FREE(middle);
 389 }
 390
 391 struct draw_pt_middle_end *draw_pt_middle_fse( struct draw_context *draw )
 392 {
 393    struct fetch_shade_emit *fse = CALLOC_STRUCT(fetch_shade_emit);
 394    if (!fse)
 395       return NULL;
 396
 397    fse->base.prepare = fse_prepare;
 398    fse->base.run = fse_run;
 399    fse->base.run_linear = fse_run_linear;
 400    fse->base.run_linear_elts = fse_run_linear_elts;
 401    fse->base.finish = fse_finish;
 402    fse->base.destroy = fse_destroy;
 403    fse->draw = draw;
 404
 405    return &fse->base;
 406 }