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
  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 static void fse_prepare( struct draw_pt_middle_end *middle,
  71                          unsigned prim,
  72                          unsigned opt,
  73                          unsigned *max_vertices )
  74 {
  75    struct fetch_shade_emit *fse = (struct fetch_shade_emit *)middle;
  76    struct draw_context *draw = fse->draw;
  77    unsigned num_vs_inputs = draw->vs.vertex_shader->info.num_inputs;
  78    const struct vertex_info *vinfo;
  79    unsigned i;
  80    unsigned nr_vbs = 0;
  81
  82    /* Can't support geometry shader on this path.
  83     */
  84    assert(!draw->gs.geometry_shader);
  85
  86    if (!draw->render->set_primitive( draw->render,
  87                                      prim )) {
  88       assert(0);
  89       return;
  90    }
  91
  92    /* Must do this after set_primitive() above:
  93     */
  94    fse->vinfo = vinfo = draw->render->get_vertex_info(draw->render);
  95
  96
  97    fse->key.output_stride = vinfo->size * 4;
  98    fse->key.nr_outputs = vinfo->num_attribs;
  99    fse->key.nr_inputs = num_vs_inputs;
 100
 101    fse->key.nr_elements = MAX2(fse->key.nr_outputs,     /* outputs - translate to hw format */
 102                                fse->key.nr_inputs);     /* inputs - fetch from api format */
 103
 104    fse->key.viewport = !draw->identity_viewport;
 105    fse->key.clip = !draw->bypass_clipping;
 106    fse->key.const_vbuffers = 0;
 107
 108    memset(fse->key.element, 0,
 109           fse->key.nr_elements * sizeof(fse->key.element[0]));
 110
 111    for (i = 0; i < num_vs_inputs; i++) {
 112       const struct pipe_vertex_element *src = &draw->pt.vertex_element[i];
 113       fse->key.element[i].in.format = src->src_format;
 114
 115       /* Consider ignoring these, ie make generated programs
 116        * independent of this state:
 117        */
 118       fse->key.element[i].in.buffer = src->vertex_buffer_index;
 119       fse->key.element[i].in.offset = src->src_offset;
 120       nr_vbs = MAX2(nr_vbs, src->vertex_buffer_index + 1);
 121    }
 122
 123    for (i = 0; i < 5 && i < nr_vbs; i++) {
 124       if (draw->pt.vertex_buffer[i].stride == 0)
 125          fse->key.const_vbuffers |= (1<<i);
 126    }
 127
 128    if (0) debug_printf("%s: lookup const_vbuffers: %x\n", __FUNCTION__, fse->key.const_vbuffers);
 129
 130    {
 131       unsigned dst_offset = 0;
 132
 133       for (i = 0; i < vinfo->num_attribs; i++) {
 134          unsigned emit_sz = draw_translate_vinfo_size(vinfo->attrib[i].emit);
 135
 136          /* doesn't handle EMIT_OMIT */
 137          assert(emit_sz != 0);
 138
 139          /* The elements in the key correspond to vertex shader output
 140           * numbers, not to positions in the hw vertex description --
 141           * that's handled by the output_offset field.
 142           */
 143          fse->key.element[i].out.format = vinfo->attrib[i].emit;
 144          fse->key.element[i].out.vs_output = vinfo->attrib[i].src_index;
 145          fse->key.element[i].out.offset = dst_offset;
 146
 147          dst_offset += emit_sz;
 148          assert(fse->key.output_stride >= dst_offset);
 149       }
 150    }
 151
 152
 153    fse->active = draw_vs_lookup_varient( draw->vs.vertex_shader,
 154                                          &fse->key );
 155
 156    if (!fse->active) {
 157       assert(0);
 158       return ;
 159    }
 160
 161    if (0) debug_printf("%s: found const_vbuffers: %x\n", __FUNCTION__,
 162                        fse->active->key.const_vbuffers);
 163
 164    /* Now set buffer pointers:
 165     */
 166    for (i = 0; i < draw->pt.nr_vertex_buffers; i++) {
 167       fse->active->set_buffer( fse->active,
 168                                i,
 169                                ((const ubyte *) draw->pt.user.vbuffer[i] +
 170                                 draw->pt.vertex_buffer[i].buffer_offset),
 171                               draw->pt.vertex_buffer[i].stride,
 172                               draw->pt.vertex_buffer[i].max_index );
 173    }
 174
 175    *max_vertices = (draw->render->max_vertex_buffer_bytes /
 176                     (vinfo->size * 4));
 177
 178    /* Return an even number of verts.
 179     * This prevents "parity" errors when splitting long triangle strips which
 180     * can lead to front/back culling mix-ups.
 181     * Every other triangle in a strip has an alternate front/back orientation
 182     * so splitting at an odd position can cause the orientation of subsequent
 183     * triangles to get reversed.
 184     */
 185    *max_vertices = *max_vertices & ~1;
 186
 187    /* Probably need to do this somewhere (or fix exec shader not to
 188     * need it):
 189     */
 190    if (1) {
 191       struct draw_vertex_shader *vs = draw->vs.vertex_shader;
 192       vs->prepare(vs, draw);
 193    }
 194 }
 195
 196
 197
 198 static void fse_run_linear( struct draw_pt_middle_end *middle,
 199                             unsigned start,
 200                             unsigned count )
 201 {
 202    struct fetch_shade_emit *fse = (struct fetch_shade_emit *)middle;
 203    struct draw_context *draw = fse->draw;
 204    char *hw_verts;
 205
 206    /* XXX: need to flush to get prim_vbuf.c to release its allocation??
 207     */
 208    draw_do_flush( draw, DRAW_FLUSH_BACKEND );
 209
 210    if (count >= UNDEFINED_VERTEX_ID)
 211       goto fail;
 212
 213    if (!draw->render->allocate_vertices( draw->render,
 214                                          (ushort)fse->key.output_stride,
 215                                          (ushort)count ))
 216       goto fail;
 217
 218    hw_verts = draw->render->map_vertices( draw->render );
 219    if (!hw_verts)
 220       goto fail;
 221
 222    /* Single routine to fetch vertices, run shader and emit HW verts.
 223     * Clipping is done elsewhere -- either by the API or on hardware,
 224     * or for some other reason not required...
 225     */
 226    fse->active->run_linear( fse->active,
 227                             start, count,
 228                             hw_verts );
 229
 230
 231    if (0) {
 232       unsigned i;
 233       for (i = 0; i < count; i++) {
 234          debug_printf("\n\n%s vertex %d: (stride %d, offset %d)\n", __FUNCTION__, i,
 235                       fse->key.output_stride,
 236                       fse->key.output_stride * i);
 237
 238          draw_dump_emitted_vertex( fse->vinfo,
 239                                    (const uint8_t *)hw_verts + fse->key.output_stride * i );
 240       }
 241    }
 242
 243    draw->render->unmap_vertices( draw->render, 0, (ushort)(count - 1) );
 244
 245    /* Draw arrays path to avoid re-emitting index list again and
 246     * again.
 247     */
 248    draw->render->draw_arrays( draw->render,
 249                               0,
 250                               count );
 251
 252
 253    draw->render->release_vertices( draw->render );
 254
 255    return;
 256
 257 fail:
 258    assert(0);
 259    return;
 260 }
 261
 262
 263 static void
 264 fse_run(struct draw_pt_middle_end *middle,
 265         const unsigned *fetch_elts,
 266         unsigned fetch_count,
 267         const ushort *draw_elts,
 268         unsigned draw_count )
 269 {
 270    struct fetch_shade_emit *fse = (struct fetch_shade_emit *)middle;
 271    struct draw_context *draw = fse->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 (fetch_count >= UNDEFINED_VERTEX_ID)
 279       goto fail;
 280
 281    if (!draw->render->allocate_vertices( draw->render,
 282                                          (ushort)fse->key.output_stride,
 283                                          (ushort)fetch_count ))
 284       goto fail;
 285
 286    hw_verts = draw->render->map_vertices( draw->render );
 287    if (!hw_verts)
 288       goto fail;
 289
 290
 291    /* Single routine to fetch vertices, run shader and emit HW verts.
 292     */
 293    fse->active->run_elts( fse->active,
 294                           fetch_elts,
 295                           fetch_count,
 296                           hw_verts );
 297
 298
 299    if (0) {
 300       unsigned i;
 301       for (i = 0; i < fetch_count; i++) {
 302          debug_printf("\n\n%s vertex %d:\n", __FUNCTION__, i);
 303          draw_dump_emitted_vertex( fse->vinfo,
 304                                    (const uint8_t *)hw_verts +
 305                                    fse->key.output_stride * i );
 306       }
 307    }
 308
 309    draw->render->unmap_vertices( draw->render, 0, (ushort)(fetch_count - 1) );
 310
 311    draw->render->draw_elements( draw->render,
 312                                 draw_elts,
 313                                 draw_count );
 314
 315
 316    draw->render->release_vertices( draw->render );
 317    return;
 318
 319 fail:
 320    assert(0);
 321    return;
 322 }
 323
 324
 325
 326 static boolean fse_run_linear_elts( struct draw_pt_middle_end *middle,
 327                                  unsigned start,
 328                                  unsigned count,
 329                                  const ushort *draw_elts,
 330                                  unsigned draw_count )
 331 {
 332    struct fetch_shade_emit *fse = (struct fetch_shade_emit *)middle;
 333    struct draw_context *draw = fse->draw;
 334    char *hw_verts;
 335
 336    /* XXX: need to flush to get prim_vbuf.c to release its allocation??
 337     */
 338    draw_do_flush( draw, DRAW_FLUSH_BACKEND );
 339
 340    if (count >= UNDEFINED_VERTEX_ID)
 341       return FALSE;
 342
 343    if (!draw->render->allocate_vertices( draw->render,
 344                                          (ushort)fse->key.output_stride,
 345                                          (ushort)count ))
 346       return FALSE;
 347
 348    hw_verts = draw->render->map_vertices( draw->render );
 349    if (!hw_verts)
 350       return FALSE;
 351
 352    /* Single routine to fetch vertices, run shader and emit HW verts.
 353     * Clipping is done elsewhere -- either by the API or on hardware,
 354     * or for some other reason not required...
 355     */
 356    fse->active->run_linear( fse->active,
 357                             start, count,
 358                             hw_verts );
 359
 360
 361    draw->render->draw_elements( draw->render,
 362                                 draw_elts,
 363                                 draw_count );
 364
 365
 366    draw->render->unmap_vertices( draw->render, 0, (ushort)(count - 1) );
 367
 368    draw->render->release_vertices( draw->render );
 369
 370    return TRUE;
 371 }
 372
 373
 374
 375 static void fse_finish( struct draw_pt_middle_end *middle )
 376 {
 377 }
 378
 379
 380 static void
 381 fse_destroy( struct draw_pt_middle_end *middle )
 382 {
 383    FREE(middle);
 384 }
 385
 386 struct draw_pt_middle_end *draw_pt_middle_fse( struct draw_context *draw )
 387 {
 388    struct fetch_shade_emit *fse = CALLOC_STRUCT(fetch_shade_emit);
 389    if (!fse)
 390       return NULL;
 391
 392    fse->base.prepare = fse_prepare;
 393    fse->base.run = fse_run;
 394    fse->base.run_linear = fse_run_linear;
 395    fse->base.run_linear_elts = fse_run_linear_elts;
 396    fse->base.finish = fse_finish;
 397    fse->base.destroy = fse_destroy;
 398    fse->draw = draw;
 399
 400    return &fse->base;
 401 }