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 "util/u_math.h"
  35 #include "util/u_memory.h"
  36 #include "draw/draw_context.h"
  37 #include "draw/draw_private.h"
  38 #include "draw/draw_vbuf.h"
  39 #include "draw/draw_vertex.h"
  40 #include "draw/draw_pt.h"
  41 #include "draw/draw_vs.h"
  42
  43 #include "translate/translate.h"
  44
  45 struct fetch_shade_emit;
  46
  47
  48 /* Prototype fetch, shade, emit-hw-verts all in one go.
  49  */
  50 struct fetch_shade_emit {
  51    struct draw_pt_middle_end base;
  52    struct draw_context *draw;
  53
  54
  55    /* Temporaries:
  56     */
  57    const float *constants;
  58    unsigned pitch[PIPE_MAX_ATTRIBS];
  59    const ubyte *src[PIPE_MAX_ATTRIBS];
  60    unsigned prim;
  61
  62    struct draw_vs_varient_key key;
  63    struct draw_vs_varient *active;
  64
  65
  66    const struct vertex_info *vinfo;
  67 };
  68
  69
  70
  71
  72 static void fse_prepare( struct draw_pt_middle_end *middle,
  73                          unsigned prim,
  74                          unsigned opt,
  75                          unsigned *max_vertices )
  76 {
  77    struct fetch_shade_emit *fse = (struct fetch_shade_emit *)middle;
  78    struct draw_context *draw = fse->draw;
  79    unsigned num_vs_inputs = draw->vs.vertex_shader->info.num_inputs;
  80    const struct vertex_info *vinfo;
  81    unsigned i;
  82
  83
  84    if (!draw->render->set_primitive( draw->render,
  85                                      prim )) {
  86       assert(0);
  87       return;
  88    }
  89
  90    /* Must do this after set_primitive() above:
  91     */
  92    fse->vinfo = vinfo = draw->render->get_vertex_info(draw->render);
  93
  94
  95
  96    fse->key.output_stride = vinfo->size * 4;
  97    fse->key.nr_outputs = vinfo->num_attribs;
  98    fse->key.nr_inputs = num_vs_inputs;
  99
 100    fse->key.nr_elements = MAX2(fse->key.nr_outputs,     /* outputs - translate to hw format */
 101                                fse->key.nr_inputs);     /* inputs - fetch from api format */
 102
 103    fse->key.viewport = !draw->identity_viewport;
 104    fse->key.clip = !draw->bypass_clipping;
 105    fse->key.pad = 0;
 106
 107    memset(fse->key.element, 0,
 108           fse->key.nr_elements * sizeof(fse->key.element[0]));
 109
 110    for (i = 0; i < num_vs_inputs; i++) {
 111       const struct pipe_vertex_element *src = &draw->pt.vertex_element[i];
 112       fse->key.element[i].in.format = src->src_format;
 113
 114       /* Consider ignoring these, ie make generated programs
 115        * independent of this state:
 116        */
 117       fse->key.element[i].in.buffer = src->vertex_buffer_index;
 118       fse->key.element[i].in.offset = src->src_offset;
 119    }
 120
 121
 122    {
 123       unsigned dst_offset = 0;
 124
 125       for (i = 0; i < vinfo->num_attribs; i++) {
 126          unsigned emit_sz = 0;
 127
 128          switch (vinfo->emit[i]) {
 129          case EMIT_4F:
 130             emit_sz = 4 * sizeof(float);
 131             break;
 132          case EMIT_3F:
 133             emit_sz = 3 * sizeof(float);
 134             break;
 135          case EMIT_2F:
 136             emit_sz = 2 * sizeof(float);
 137             break;
 138          case EMIT_1F:
 139             emit_sz = 1 * sizeof(float);
 140             break;
 141          case EMIT_1F_PSIZE:
 142             emit_sz = 1 * sizeof(float);
 143             break;
 144          case EMIT_4UB:
 145             emit_sz = 4 * sizeof(ubyte);
 146             break;
 147          default:
 148             assert(0);
 149             break;
 150          }
 151
 152          /* The elements in the key correspond to vertex shader output
 153           * numbers, not to positions in the hw vertex description --
 154           * that's handled by the output_offset field.
 155           */
 156          fse->key.element[i].out.format = vinfo->emit[i];
 157          fse->key.element[i].out.vs_output = vinfo->src_index[i];
 158          fse->key.element[i].out.offset = dst_offset;
 159
 160          dst_offset += emit_sz;
 161          assert(fse->key.output_stride >= dst_offset);
 162       }
 163    }
 164
 165
 166    /* Would normally look up a vertex shader and peruse its list of
 167     * varients somehow.  We omitted that step and put all the
 168     * hardcoded "shaders" into an array.  We're just making the
 169     * assumption that this happens to be a matching shader...  ie
 170     * you're running isosurf, aren't you?
 171     */
 172    fse->active = draw_vs_lookup_varient( draw->vs.vertex_shader,
 173                                          &fse->key );
 174
 175    if (!fse->active) {
 176       assert(0);
 177       return ;
 178    }
 179
 180    /* Now set buffer pointers:
 181     */
 182    for (i = 0; i < num_vs_inputs; i++) {
 183       unsigned buf = draw->pt.vertex_element[i].vertex_buffer_index;
 184
 185       fse->active->set_input( fse->active,
 186                               i,
 187
 188                               ((const ubyte *) draw->pt.user.vbuffer[buf] +
 189                                draw->pt.vertex_buffer[buf].buffer_offset),
 190
 191                               draw->pt.vertex_buffer[buf].pitch );
 192    }
 193
 194    *max_vertices = (draw->render->max_vertex_buffer_bytes /
 195                     (vinfo->size * 4));
 196
 197    /* Return an even number of verts.
 198     * This prevents "parity" errors when splitting long triangle strips which
 199     * can lead to front/back culling mix-ups.
 200     * Every other triangle in a strip has an alternate front/back orientation
 201     * so splitting at an odd position can cause the orientation of subsequent
 202     * triangles to get reversed.
 203     */
 204    *max_vertices = *max_vertices & ~1;
 205
 206    /* Probably need to do this somewhere (or fix exec shader not to
 207     * need it):
 208     */
 209    if (1) {
 210       struct draw_vertex_shader *vs = draw->vs.vertex_shader;
 211       vs->prepare(vs, draw);
 212    }
 213
 214
 215    //return TRUE;
 216 }
 217
 218
 219
 220
 221
 222
 223
 224 static void fse_run_linear( struct draw_pt_middle_end *middle,
 225                             unsigned start,
 226                             unsigned count )
 227 {
 228    struct fetch_shade_emit *fse = (struct fetch_shade_emit *)middle;
 229    struct draw_context *draw = fse->draw;
 230    char *hw_verts;
 231
 232    /* XXX: need to flush to get prim_vbuf.c to release its allocation??
 233     */
 234    draw_do_flush( draw, DRAW_FLUSH_BACKEND );
 235
 236    hw_verts = draw->render->allocate_vertices( draw->render,
 237                                                (ushort)fse->key.output_stride,
 238                                                (ushort)count );
 239
 240    if (!hw_verts) {
 241       assert(0);
 242       return;
 243    }
 244
 245    /* Single routine to fetch vertices, run shader and emit HW verts.
 246     * Clipping is done elsewhere -- either by the API or on hardware,
 247     * or for some other reason not required...
 248     */
 249    fse->active->run_linear( fse->active,
 250                             start, count,
 251                             hw_verts );
 252
 253    /* Draw arrays path to avoid re-emitting index list again and
 254     * again.
 255     */
 256    draw->render->draw_arrays( draw->render,
 257                               0,
 258                               count );
 259
 260    if (0) {
 261       unsigned i;
 262       for (i = 0; i < count; i++) {
 263          debug_printf("\n\n%s vertex %d: (stride %d, offset %d)\n", __FUNCTION__, i,
 264                       fse->key.output_stride,
 265                       fse->key.output_stride * i);
 266
 267          draw_dump_emitted_vertex( fse->vinfo,
 268                                    (const uint8_t *)hw_verts + fse->key.output_stride * i );
 269       }
 270    }
 271
 272
 273    draw->render->release_vertices( draw->render,
 274                                    hw_verts,
 275                                    fse->key.output_stride,
 276                                    count );
 277 }
 278
 279
 280 static void
 281 fse_run(struct draw_pt_middle_end *middle,
 282         const unsigned *fetch_elts,
 283         unsigned fetch_count,
 284         const ushort *draw_elts,
 285         unsigned draw_count )
 286 {
 287    struct fetch_shade_emit *fse = (struct fetch_shade_emit *)middle;
 288    struct draw_context *draw = fse->draw;
 289    void *hw_verts;
 290
 291    /* XXX: need to flush to get prim_vbuf.c to release its allocation??
 292     */
 293    draw_do_flush( draw, DRAW_FLUSH_BACKEND );
 294
 295    hw_verts = draw->render->allocate_vertices( draw->render,
 296                                                (ushort)fse->key.output_stride,
 297                                                (ushort)fetch_count );
 298    if (!hw_verts) {
 299       assert(0);
 300       return;
 301    }
 302
 303
 304    /* Single routine to fetch vertices, run shader and emit HW verts.
 305     */
 306    fse->active->run_elts( fse->active,
 307                           fetch_elts,
 308                           fetch_count,
 309                           hw_verts );
 310
 311    draw->render->draw( draw->render,
 312                        draw_elts,
 313                        draw_count );
 314
 315    if (0) {
 316       unsigned i;
 317       for (i = 0; i < fetch_count; i++) {
 318          debug_printf("\n\n%s vertex %d:\n", __FUNCTION__, i);
 319          draw_dump_emitted_vertex( fse->vinfo,
 320                                    (const uint8_t *)hw_verts +
 321                                    fse->key.output_stride * i );
 322       }
 323    }
 324
 325
 326    draw->render->release_vertices( draw->render,
 327                                    hw_verts,
 328                                    fse->key.output_stride,
 329                                    fetch_count );
 330
 331 }
 332
 333
 334
 335 static boolean fse_run_linear_elts( struct draw_pt_middle_end *middle,
 336                                  unsigned start,
 337                                  unsigned count,
 338                                  const ushort *draw_elts,
 339                                  unsigned draw_count )
 340 {
 341    struct fetch_shade_emit *fse = (struct fetch_shade_emit *)middle;
 342    struct draw_context *draw = fse->draw;
 343    char *hw_verts;
 344
 345    /* XXX: need to flush to get prim_vbuf.c to release its allocation??
 346     */
 347    draw_do_flush( draw, DRAW_FLUSH_BACKEND );
 348
 349    hw_verts = draw->render->allocate_vertices( draw->render,
 350                                                (ushort)fse->key.output_stride,
 351                                                (ushort)count );
 352
 353    if (!hw_verts) {
 354       return FALSE;
 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    return TRUE;
 378 }
 379
 380
 381
 382 static void fse_finish( struct draw_pt_middle_end *middle )
 383 {
 384 }
 385
 386
 387 static void
 388 fse_destroy( struct draw_pt_middle_end *middle )
 389 {
 390    FREE(middle);
 391 }
 392
 393 struct draw_pt_middle_end *draw_pt_middle_fse( struct draw_context *draw )
 394 {
 395    struct fetch_shade_emit *fse = CALLOC_STRUCT(fetch_shade_emit);
 396    if (!fse)
 397       return NULL;
 398
 399    fse->base.prepare = fse_prepare;
 400    fse->base.run = fse_run;
 401    fse->base.run_linear = fse_run_linear;
 402    fse->base.run_linear_elts = fse_run_linear_elts;
 403    fse->base.finish = fse_finish;
 404    fse->base.destroy = fse_destroy;
 405    fse->draw = draw;
 406
 407    return &fse->base;
 408 }