src/gallium/auxiliary/draw/draw_pt_fetch_shade_pipeline_llvm.c

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  27
  28 #include "util/u_math.h"
  29 #include "util/u_memory.h"
  30 #include "draw/draw_context.h"
  31 #include "draw/draw_gs.h"
  32 #include "draw/draw_vbuf.h"
  33 #include "draw/draw_vertex.h"
  34 #include "draw/draw_pt.h"
  35 #include "draw/draw_vs.h"
  36 #include "draw/draw_llvm.h"
  37 #include "gallivm/lp_bld_init.h"
  38
  39
  40 struct llvm_middle_end {
  41    struct draw_pt_middle_end base;
  42    struct draw_context *draw;
  43
  44    struct pt_emit *emit;
  45    struct pt_so_emit *so_emit;
  46    struct pt_fetch *fetch;
  47    struct pt_post_vs *post_vs;
  48
  49
  50    unsigned vertex_data_offset;
  51    unsigned vertex_size;
  52    unsigned input_prim;
  53    unsigned opt;
  54
  55    struct draw_llvm *llvm;
  56    struct draw_llvm_variant *current_variant;
  57 };
  58
  59
  60 static void
  61 llvm_middle_end_prepare( struct draw_pt_middle_end *middle,
  62                          unsigned in_prim,
  63                          unsigned opt,
  64                          unsigned *max_vertices )
  65 {
  66    struct llvm_middle_end *fpme = (struct llvm_middle_end *)middle;
  67    struct draw_context *draw = fpme->draw;
  68    struct llvm_vertex_shader *shader =
  69       llvm_vertex_shader(draw->vs.vertex_shader);
  70    char store[DRAW_LLVM_MAX_VARIANT_KEY_SIZE];
  71    struct draw_llvm_variant_key *key;
  72    struct draw_llvm_variant *variant = NULL;
  73    struct draw_llvm_variant_list_item *li;
  74    unsigned i;
  75    unsigned instance_id_index = ~0;
  76    const unsigned out_prim = (draw->gs.geometry_shader ?
  77                               draw->gs.geometry_shader->output_primitive :
  78                               in_prim);
  79
  80    /* Add one to num_outputs because the pipeline occasionally tags on
  81     * an additional texcoord, eg for AA lines.
  82     */
  83    const unsigned nr = MAX2( shader->base.info.num_inputs,
  84                              shader->base.info.num_outputs + 1 );
  85
  86    /* Scan for instanceID system value.
  87     * XXX but we never use instance_id_index?!
  88     */
  89    for (i = 0; i < shader->base.info.num_inputs; i++) {
  90       if (shader->base.info.input_semantic_name[i] == TGSI_SEMANTIC_INSTANCEID) {
  91          instance_id_index = i;
  92          break;
  93       }
  94    }
  95
  96    fpme->input_prim = in_prim;
  97    fpme->opt = opt;
  98
  99    /* Always leave room for the vertex header whether we need it or
 100     * not.  It's hard to get rid of it in particular because of the
 101     * viewport code in draw_pt_post_vs.c.
 102     */
 103    fpme->vertex_size = sizeof(struct vertex_header) + nr * 4 * sizeof(float);
 104
 105
 106    /* XXX: it's not really gl rasterization rules we care about here,
 107     * but gl vs dx9 clip spaces.
 108     */
 109    draw_pt_post_vs_prepare( fpme->post_vs,
 110                             draw->clip_xy,
 111                             draw->clip_z,
 112                             draw->clip_user,
 113                             draw->identity_viewport,
 114                             (boolean)draw->rasterizer->gl_rasterization_rules,
 115                             (draw->vs.edgeflag_output ? TRUE : FALSE) );
 116
 117    draw_pt_so_emit_prepare( fpme->so_emit );
 118
 119    if (!(opt & PT_PIPELINE)) {
 120       draw_pt_emit_prepare( fpme->emit,
 121                             out_prim,
 122                             max_vertices );
 123
 124       *max_vertices = MAX2( *max_vertices, 4096 );
 125    }
 126    else {
 127       /* limit max fetches by limiting max_vertices */
 128       *max_vertices = 4096;
 129    }
 130
 131    /* return even number */
 132    *max_vertices = *max_vertices & ~1;
 133
 134    key = draw_llvm_make_variant_key(fpme->llvm, store);
 135
 136    /* Search shader's list of variants for the key */
 137    li = first_elem(&shader->variants);
 138    while (!at_end(&shader->variants, li)) {
 139       if (memcmp(&li->base->key, key, shader->variant_key_size) == 0) {
 140          variant = li->base;
 141          break;
 142       }
 143       li = next_elem(li);
 144    }
 145
 146    if (variant) {
 147       /* found the variant, move to head of global list (for LRU) */
 148       move_to_head(&fpme->llvm->vs_variants_list, &variant->list_item_global);
 149    }
 150    else {
 151       /* Need to create new variant */
 152       unsigned i;
 153
 154       /* First check if we've created too many variants.  If so, free
 155        * 25% of the LRU to avoid using too much memory.
 156        */
 157       if (fpme->llvm->nr_variants >= DRAW_MAX_SHADER_VARIANTS) {
 158          /*
 159           * XXX: should we flush here ?
 160           */
 161          for (i = 0; i < DRAW_MAX_SHADER_VARIANTS / 4; i++) {
 162             struct draw_llvm_variant_list_item *item =
 163                last_elem(&fpme->llvm->vs_variants_list);
 164             draw_llvm_destroy_variant(item->base);
 165          }
 166       }
 167
 168       variant = draw_llvm_create_variant(fpme->llvm, nr, key);
 169
 170       if (variant) {
 171          insert_at_head(&shader->variants, &variant->list_item_local);
 172          insert_at_head(&fpme->llvm->vs_variants_list, &variant->list_item_global);
 173          fpme->llvm->nr_variants++;
 174          shader->variants_cached++;
 175       }
 176    }
 177
 178    fpme->current_variant = variant;
 179
 180    /*XXX we only support one constant buffer */
 181    fpme->llvm->jit_context.vs_constants =
 182       draw->pt.user.vs_constants[0];
 183    fpme->llvm->jit_context.gs_constants =
 184       draw->pt.user.gs_constants[0];
 185    fpme->llvm->jit_context.planes =
 186       (float (*) [12][4]) draw->pt.user.planes[0];
 187    fpme->llvm->jit_context.viewport =
 188       (float *)draw->viewport.scale;
 189
 190 }
 191
 192
 193 static void pipeline(struct llvm_middle_end *llvm,
 194                      const struct draw_vertex_info *vert_info,
 195                      const struct draw_prim_info *prim_info)
 196 {
 197    if (prim_info->linear)
 198       draw_pipeline_run_linear( llvm->draw,
 199                                 vert_info,
 200                                 prim_info);
 201    else
 202       draw_pipeline_run( llvm->draw,
 203                          vert_info,
 204                          prim_info );
 205 }
 206
 207 static void emit(struct pt_emit *emit,
 208                  const struct draw_vertex_info *vert_info,
 209                  const struct draw_prim_info *prim_info)
 210 {
 211    if (prim_info->linear) {
 212       draw_pt_emit_linear(emit, vert_info, prim_info);
 213    }
 214    else {
 215       draw_pt_emit(emit, vert_info, prim_info);
 216    }
 217 }
 218
 219 static void
 220 llvm_pipeline_generic( struct draw_pt_middle_end *middle,
 221                        const struct draw_fetch_info *fetch_info,
 222                        const struct draw_prim_info *prim_info )
 223 {
 224    struct llvm_middle_end *fpme = (struct llvm_middle_end *)middle;
 225    struct draw_context *draw = fpme->draw;
 226    struct draw_geometry_shader *gshader = draw->gs.geometry_shader;
 227    struct draw_prim_info gs_prim_info;
 228    struct draw_vertex_info llvm_vert_info;
 229    struct draw_vertex_info gs_vert_info;
 230    struct draw_vertex_info *vert_info;
 231    unsigned opt = fpme->opt;
 232    unsigned clipped = 0;
 233
 234    llvm_vert_info.count = fetch_info->count;
 235    llvm_vert_info.vertex_size = fpme->vertex_size;
 236    llvm_vert_info.stride = fpme->vertex_size;
 237    llvm_vert_info.verts =
 238       (struct vertex_header *)MALLOC(fpme->vertex_size *
 239                                      align(fetch_info->count,  4));
 240    if (!llvm_vert_info.verts) {
 241       assert(0);
 242       return;
 243    }
 244
 245    if (fetch_info->linear)
 246       clipped = fpme->current_variant->jit_func( &fpme->llvm->jit_context,
 247                                        llvm_vert_info.verts,
 248                                        (const char **)draw->pt.user.vbuffer,
 249                                        fetch_info->start,
 250                                        fetch_info->count,
 251                                        fpme->vertex_size,
 252                                        draw->pt.vertex_buffer,
 253                                        draw->instance_id);
 254    else
 255       clipped = fpme->current_variant->jit_func_elts( &fpme->llvm->jit_context,
 256                                             llvm_vert_info.verts,
 257                                             (const char **)draw->pt.user.vbuffer,
 258                                             fetch_info->elts,
 259                                             fetch_info->count,
 260                                             fpme->vertex_size,
 261                                             draw->pt.vertex_buffer,
 262                                             draw->instance_id);
 263
 264    /* Finished with fetch and vs:
 265     */
 266    fetch_info = NULL;
 267    vert_info = &llvm_vert_info;
 268
 269
 270    if ((opt & PT_SHADE) && gshader) {
 271       draw_geometry_shader_run(gshader,
 272                                draw->pt.user.gs_constants,
 273                                draw->pt.user.gs_constants_size,
 274                                vert_info,
 275                                prim_info,
 276                                &gs_vert_info,
 277                                &gs_prim_info);
 278
 279       FREE(vert_info->verts);
 280       vert_info = &gs_vert_info;
 281       prim_info = &gs_prim_info;
 282
 283       clipped = draw_pt_post_vs_run( fpme->post_vs, vert_info );
 284
 285    }
 286
 287    /* stream output needs to be done before clipping */
 288    draw_pt_so_emit( fpme->so_emit,
 289                     vert_info,
 290                     prim_info );
 291
 292    if (clipped) {
 293       opt |= PT_PIPELINE;
 294    }
 295
 296    /* Do we need to run the pipeline? Now will come here if clipped
 297     */
 298    if (opt & PT_PIPELINE) {
 299       pipeline( fpme,
 300                 vert_info,
 301                 prim_info );
 302    }
 303    else {
 304       emit( fpme->emit,
 305             vert_info,
 306             prim_info );
 307    }
 308    FREE(vert_info->verts);
 309 }
 310
 311
 312 static void llvm_middle_end_run( struct draw_pt_middle_end *middle,
 313                                  const unsigned *fetch_elts,
 314                                  unsigned fetch_count,
 315                                  const ushort *draw_elts,
 316                                  unsigned draw_count,
 317                                  unsigned prim_flags )
 318 {
 319    struct llvm_middle_end *fpme = (struct llvm_middle_end *)middle;
 320    struct draw_fetch_info fetch_info;
 321    struct draw_prim_info prim_info;
 322
 323    fetch_info.linear = FALSE;
 324    fetch_info.start = 0;
 325    fetch_info.elts = fetch_elts;
 326    fetch_info.count = fetch_count;
 327
 328    prim_info.linear = FALSE;
 329    prim_info.start = 0;
 330    prim_info.count = draw_count;
 331    prim_info.elts = draw_elts;
 332    prim_info.prim = fpme->input_prim;
 333    prim_info.flags = prim_flags;
 334    prim_info.primitive_count = 1;
 335    prim_info.primitive_lengths = &draw_count;
 336
 337    llvm_pipeline_generic( middle, &fetch_info, &prim_info );
 338 }
 339
 340
 341 static void llvm_middle_end_linear_run( struct draw_pt_middle_end *middle,
 342                                        unsigned start,
 343                                        unsigned count,
 344                                        unsigned prim_flags)
 345 {
 346    struct llvm_middle_end *fpme = (struct llvm_middle_end *)middle;
 347    struct draw_fetch_info fetch_info;
 348    struct draw_prim_info prim_info;
 349
 350    fetch_info.linear = TRUE;
 351    fetch_info.start = start;
 352    fetch_info.count = count;
 353    fetch_info.elts = NULL;
 354
 355    prim_info.linear = TRUE;
 356    prim_info.start = 0;
 357    prim_info.count = count;
 358    prim_info.elts = NULL;
 359    prim_info.prim = fpme->input_prim;
 360    prim_info.flags = prim_flags;
 361    prim_info.primitive_count = 1;
 362    prim_info.primitive_lengths = &count;
 363
 364    llvm_pipeline_generic( middle, &fetch_info, &prim_info );
 365 }
 366
 367
 368
 369 static boolean
 370 llvm_middle_end_linear_run_elts( struct draw_pt_middle_end *middle,
 371                                  unsigned start,
 372                                  unsigned count,
 373                                  const ushort *draw_elts,
 374                                  unsigned draw_count,
 375                                  unsigned prim_flags )
 376 {
 377    struct llvm_middle_end *fpme = (struct llvm_middle_end *)middle;
 378    struct draw_fetch_info fetch_info;
 379    struct draw_prim_info prim_info;
 380
 381    fetch_info.linear = TRUE;
 382    fetch_info.start = start;
 383    fetch_info.count = count;
 384    fetch_info.elts = NULL;
 385
 386    prim_info.linear = FALSE;
 387    prim_info.start = 0;
 388    prim_info.count = draw_count;
 389    prim_info.elts = draw_elts;
 390    prim_info.prim = fpme->input_prim;
 391    prim_info.flags = prim_flags;
 392    prim_info.primitive_count = 1;
 393    prim_info.primitive_lengths = &draw_count;
 394
 395    llvm_pipeline_generic( middle, &fetch_info, &prim_info );
 396
 397    return TRUE;
 398 }
 399
 400
 401
 402 static void llvm_middle_end_finish( struct draw_pt_middle_end *middle )
 403 {
 404    /* nothing to do */
 405 }
 406
 407 static void llvm_middle_end_destroy( struct draw_pt_middle_end *middle )
 408 {
 409    struct llvm_middle_end *fpme = (struct llvm_middle_end *)middle;
 410
 411    if (fpme->fetch)
 412       draw_pt_fetch_destroy( fpme->fetch );
 413
 414    if (fpme->emit)
 415       draw_pt_emit_destroy( fpme->emit );
 416
 417    if (fpme->so_emit)
 418       draw_pt_so_emit_destroy( fpme->so_emit );
 419
 420    if (fpme->post_vs)
 421       draw_pt_post_vs_destroy( fpme->post_vs );
 422
 423    FREE(middle);
 424 }
 425
 426
 427 struct draw_pt_middle_end *
 428 draw_pt_fetch_pipeline_or_emit_llvm(struct draw_context *draw)
 429 {
 430    struct llvm_middle_end *fpme = 0;
 431
 432    if (!draw->llvm->gallivm->engine)
 433       return NULL;
 434
 435    fpme = CALLOC_STRUCT( llvm_middle_end );
 436    if (!fpme)
 437       goto fail;
 438
 439    fpme->base.prepare         = llvm_middle_end_prepare;
 440    fpme->base.run             = llvm_middle_end_run;
 441    fpme->base.run_linear      = llvm_middle_end_linear_run;
 442    fpme->base.run_linear_elts = llvm_middle_end_linear_run_elts;
 443    fpme->base.finish          = llvm_middle_end_finish;
 444    fpme->base.destroy         = llvm_middle_end_destroy;
 445
 446    fpme->draw = draw;
 447
 448    fpme->fetch = draw_pt_fetch_create( draw );
 449    if (!fpme->fetch)
 450       goto fail;
 451
 452    fpme->post_vs = draw_pt_post_vs_create( draw );
 453    if (!fpme->post_vs)
 454       goto fail;
 455
 456    fpme->emit = draw_pt_emit_create( draw );
 457    if (!fpme->emit)
 458       goto fail;
 459
 460    fpme->so_emit = draw_pt_so_emit_create( draw );
 461    if (!fpme->so_emit)
 462       goto fail;
 463
 464    fpme->llvm = draw->llvm;
 465    if (!fpme->llvm)
 466       goto fail;
 467
 468    fpme->current_variant = NULL;
 469
 470    return &fpme->base;
 471
 472  fail:
 473    if (fpme)
 474       llvm_middle_end_destroy( &fpme->base );
 475
 476    return NULL;
 477 }