src/mesa/drivers/dri/i965/brw_vs.c

   1 /*
   2  Copyright (C) Intel Corp.  2006.  All Rights Reserved.
   3  Intel funded Tungsten Graphics (http://www.tungstengraphics.com) to
   4  develop this 3D driver.
   5
   6  Permission is hereby granted, free of charge, to any person obtaining
   7  a 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, sublicense, 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
  16  portions of the Software.
  17
  18  THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
  19  EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
  20  MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
  21  IN NO EVENT SHALL THE COPYRIGHT OWNER(S) AND/OR ITS SUPPLIERS BE
  22  LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
  23  OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
  24  WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
  25
  26  **********************************************************************/
  27  /*
  28   * Authors:
  29   *   Keith Whitwell <keith@tungstengraphics.com>
  30   */
  31
  32
  33 #include "main/compiler.h"
  34 #include "brw_context.h"
  35 #include "brw_vs.h"
  36 #include "brw_util.h"
  37 #include "brw_state.h"
  38 #include "program/prog_print.h"
  39 #include "program/prog_parameter.h"
  40
  41 #include "glsl/ralloc.h"
  42
  43 static inline void assign_vue_slot(struct brw_vue_map *vue_map,
  44                                    int varying)
  45 {
  46    /* Make sure this varying hasn't been assigned a slot already */
  47    assert (vue_map->varying_to_slot[varying] == -1);
  48
  49    vue_map->varying_to_slot[varying] = vue_map->num_slots;
  50    vue_map->slot_to_varying[vue_map->num_slots++] = varying;
  51 }
  52
  53 /**
  54  * Compute the VUE map for vertex shader program.
  55  *
  56  * Note that consumers of this map using cache keys must include
  57  * prog_data->userclip and prog_data->outputs_written in their key
  58  * (generated by CACHE_NEW_VS_PROG).
  59  */
  60 static void
  61 brw_compute_vue_map(struct brw_context *brw, struct brw_vs_compile *c)
  62 {
  63    const struct intel_context *intel = &brw->intel;
  64    struct brw_vue_map *vue_map = &c->prog_data.vue_map;
  65    GLbitfield64 outputs_written = c->prog_data.outputs_written;
  66    int i;
  67
  68    vue_map->num_slots = 0;
  69    for (i = 0; i < BRW_VARYING_SLOT_COUNT; ++i) {
  70       vue_map->varying_to_slot[i] = -1;
  71       vue_map->slot_to_varying[i] = BRW_VARYING_SLOT_COUNT;
  72    }
  73
  74    /* VUE header: format depends on chip generation and whether clipping is
  75     * enabled.
  76     */
  77    switch (intel->gen) {
  78    case 4:
  79       /* There are 8 dwords in VUE header pre-Ironlake:
  80        * dword 0-3 is indices, point width, clip flags.
  81        * dword 4-7 is ndc position
  82        * dword 8-11 is the first vertex data.
  83        */
  84       assign_vue_slot(vue_map, VARYING_SLOT_PSIZ);
  85       assign_vue_slot(vue_map, BRW_VARYING_SLOT_NDC);
  86       assign_vue_slot(vue_map, VARYING_SLOT_POS);
  87       break;
  88    case 5:
  89       /* There are 20 DWs (D0-D19) in VUE header on Ironlake:
  90        * dword 0-3 of the header is indices, point width, clip flags.
  91        * dword 4-7 is the ndc position
  92        * dword 8-11 of the vertex header is the 4D space position
  93        * dword 12-19 of the vertex header is the user clip distance.
  94        * dword 20-23 is a pad so that the vertex element data is aligned
  95        * dword 24-27 is the first vertex data we fill.
  96        *
  97        * Note: future pipeline stages expect 4D space position to be
  98        * contiguous with the other varyings, so we make dword 24-27 a
  99        * duplicate copy of the 4D space position.
 100        */
 101       assign_vue_slot(vue_map, VARYING_SLOT_PSIZ);
 102       assign_vue_slot(vue_map, BRW_VARYING_SLOT_NDC);
 103       assign_vue_slot(vue_map, BRW_VARYING_SLOT_POS_DUPLICATE);
 104       assign_vue_slot(vue_map, VARYING_SLOT_CLIP_DIST0);
 105       assign_vue_slot(vue_map, VARYING_SLOT_CLIP_DIST1);
 106       assign_vue_slot(vue_map, BRW_VARYING_SLOT_PAD);
 107       assign_vue_slot(vue_map, VARYING_SLOT_POS);
 108       break;
 109    case 6:
 110    case 7:
 111       /* There are 8 or 16 DWs (D0-D15) in VUE header on Sandybridge:
 112        * dword 0-3 of the header is indices, point width, clip flags.
 113        * dword 4-7 is the 4D space position
 114        * dword 8-15 of the vertex header is the user clip distance if
 115        * enabled.
 116        * dword 8-11 or 16-19 is the first vertex element data we fill.
 117        */
 118       assign_vue_slot(vue_map, VARYING_SLOT_PSIZ);
 119       assign_vue_slot(vue_map, VARYING_SLOT_POS);
 120       if (c->key.userclip_active) {
 121          assign_vue_slot(vue_map, VARYING_SLOT_CLIP_DIST0);
 122          assign_vue_slot(vue_map, VARYING_SLOT_CLIP_DIST1);
 123       }
 124       /* front and back colors need to be consecutive so that we can use
 125        * ATTRIBUTE_SWIZZLE_INPUTATTR_FACING to swizzle them when doing
 126        * two-sided color.
 127        */
 128       if (outputs_written & BITFIELD64_BIT(VARYING_SLOT_COL0))
 129          assign_vue_slot(vue_map, VARYING_SLOT_COL0);
 130       if (outputs_written & BITFIELD64_BIT(VARYING_SLOT_BFC0))
 131          assign_vue_slot(vue_map, VARYING_SLOT_BFC0);
 132       if (outputs_written & BITFIELD64_BIT(VARYING_SLOT_COL1))
 133          assign_vue_slot(vue_map, VARYING_SLOT_COL1);
 134       if (outputs_written & BITFIELD64_BIT(VARYING_SLOT_BFC1))
 135          assign_vue_slot(vue_map, VARYING_SLOT_BFC1);
 136       break;
 137    default:
 138       assert (!"VUE map not known for this chip generation");
 139       break;
 140    }
 141
 142    /* The hardware doesn't care about the rest of the vertex outputs, so just
 143     * assign them contiguously.  Don't reassign outputs that already have a
 144     * slot.
 145     *
 146     * Also, prior to Gen6, don't assign a slot for VARYING_SLOT_CLIP_VERTEX,
 147     * since it is unsupported.  In Gen6 and above, VARYING_SLOT_CLIP_VERTEX may
 148     * be needed for transform feedback; since we don't want to have to
 149     * recompute the VUE map (and everything that depends on it) when transform
 150     * feedback is enabled or disabled, just go ahead and assign a slot for it.
 151     */
 152    for (int i = 0; i < VARYING_SLOT_MAX; ++i) {
 153       if (intel->gen < 6 && i == VARYING_SLOT_CLIP_VERTEX)
 154          continue;
 155       if ((outputs_written & BITFIELD64_BIT(i)) &&
 156           vue_map->varying_to_slot[i] == -1) {
 157          assign_vue_slot(vue_map, i);
 158       }
 159    }
 160 }
 161
 162
 163 /**
 164  * Decide which set of clip planes should be used when clipping via
 165  * gl_Position or gl_ClipVertex.
 166  */
 167 gl_clip_plane *brw_select_clip_planes(struct gl_context *ctx)
 168 {
 169    if (ctx->Shader.CurrentVertexProgram) {
 170       /* There is currently a GLSL vertex shader, so clip according to GLSL
 171        * rules, which means compare gl_ClipVertex (or gl_Position, if
 172        * gl_ClipVertex wasn't assigned) against the eye-coordinate clip planes
 173        * that were stored in EyeUserPlane at the time the clip planes were
 174        * specified.
 175        */
 176       return ctx->Transform.EyeUserPlane;
 177    } else {
 178       /* Either we are using fixed function or an ARB vertex program.  In
 179        * either case the clip planes are going to be compared against
 180        * gl_Position (which is in clip coordinates) so we have to clip using
 181        * _ClipUserPlane, which was transformed into clip coordinates by Mesa
 182        * core.
 183        */
 184       return ctx->Transform._ClipUserPlane;
 185    }
 186 }
 187
 188 bool
 189 brw_vs_prog_data_compare(const void *in_a, const void *in_b,
 190                          int aux_size, const void *in_key)
 191 {
 192    const struct brw_vs_prog_data *a = in_a;
 193    const struct brw_vs_prog_data *b = in_b;
 194
 195    /* Compare all the struct up to the pointers. */
 196    if (memcmp(a, b, offsetof(struct brw_vs_prog_data, param)))
 197       return false;
 198
 199    if (memcmp(a->param, b->param, a->nr_params * sizeof(void *)))
 200       return false;
 201
 202    if (memcmp(a->pull_param, b->pull_param, a->nr_pull_params * sizeof(void *)))
 203       return false;
 204
 205    return true;
 206 }
 207
 208 static bool
 209 do_vs_prog(struct brw_context *brw,
 210            struct gl_shader_program *prog,
 211            struct brw_vertex_program *vp,
 212            struct brw_vs_prog_key *key)
 213 {
 214    struct intel_context *intel = &brw->intel;
 215    GLuint program_size;
 216    const GLuint *program;
 217    struct brw_vs_compile c;
 218    void *mem_ctx;
 219    int i;
 220    struct gl_shader *vs = NULL;
 221
 222    if (prog)
 223       vs = prog->_LinkedShaders[MESA_SHADER_VERTEX];
 224
 225    memset(&c, 0, sizeof(c));
 226    memcpy(&c.key, key, sizeof(*key));
 227
 228    mem_ctx = ralloc_context(NULL);
 229
 230    c.vp = vp;
 231
 232    /* Allocate the references to the uniforms that will end up in the
 233     * prog_data associated with the compiled program, and which will be freed
 234     * by the state cache.
 235     */
 236    int param_count;
 237    if (vs) {
 238       /* We add padding around uniform values below vec4 size, with the worst
 239        * case being a float value that gets blown up to a vec4, so be
 240        * conservative here.
 241        */
 242       param_count = vs->num_uniform_components * 4;
 243
 244    } else {
 245       param_count = vp->program.Base.Parameters->NumParameters * 4;
 246    }
 247    /* We also upload clip plane data as uniforms */
 248    param_count += MAX_CLIP_PLANES * 4;
 249
 250    c.prog_data.param = rzalloc_array(NULL, const float *, param_count);
 251    c.prog_data.pull_param = rzalloc_array(NULL, const float *, param_count);
 252
 253    c.prog_data.outputs_written = vp->program.Base.OutputsWritten;
 254    c.prog_data.inputs_read = vp->program.Base.InputsRead;
 255
 256    if (c.key.copy_edgeflag) {
 257       c.prog_data.outputs_written |= BITFIELD64_BIT(VARYING_SLOT_EDGE);
 258       c.prog_data.inputs_read |= VERT_BIT_EDGEFLAG;
 259    }
 260
 261    if (intel->gen < 6) {
 262       /* Put dummy slots into the VUE for the SF to put the replaced
 263        * point sprite coords in.  We shouldn't need these dummy slots,
 264        * which take up precious URB space, but it would mean that the SF
 265        * doesn't get nice aligned pairs of input coords into output
 266        * coords, which would be a pain to handle.
 267        */
 268       for (i = 0; i < 8; i++) {
 269          if (c.key.point_coord_replace & (1 << i))
 270             c.prog_data.outputs_written |= BITFIELD64_BIT(VARYING_SLOT_TEX0 + i);
 271       }
 272    }
 273
 274    brw_compute_vue_map(brw, &c);
 275
 276    if (0) {
 277       _mesa_fprint_program_opt(stdout, &c.vp->program.Base, PROG_PRINT_DEBUG,
 278                                true);
 279    }
 280
 281    /* Emit GEN4 code.
 282     */
 283    program = brw_vs_emit(brw, prog, &c, mem_ctx, &program_size);
 284    if (program == NULL) {
 285       ralloc_free(mem_ctx);
 286       return false;
 287    }
 288
 289    if (c.prog_data.nr_pull_params)
 290       c.prog_data.num_surfaces = 1;
 291    if (c.vp->program.Base.SamplersUsed)
 292       c.prog_data.num_surfaces = SURF_INDEX_VS_TEXTURE(BRW_MAX_TEX_UNIT);
 293    if (prog &&
 294        prog->_LinkedShaders[MESA_SHADER_VERTEX]->NumUniformBlocks) {
 295       c.prog_data.num_surfaces =
 296          SURF_INDEX_VS_UBO(prog->_LinkedShaders[MESA_SHADER_VERTEX]->NumUniformBlocks);
 297    }
 298
 299    /* Scratch space is used for register spilling */
 300    if (c.last_scratch) {
 301       perf_debug("Vertex shader triggered register spilling.  "
 302                  "Try reducing the number of live vec4 values to "
 303                  "improve performance.\n");
 304
 305       c.prog_data.total_scratch = brw_get_scratch_size(c.last_scratch*REG_SIZE);
 306
 307       brw_get_scratch_bo(intel, &brw->vs.scratch_bo,
 308                          c.prog_data.total_scratch * brw->max_vs_threads);
 309    }
 310
 311    brw_upload_cache(&brw->cache, BRW_VS_PROG,
 312                     &c.key, sizeof(c.key),
 313                     program, program_size,
 314                     &c.prog_data, sizeof(c.prog_data),
 315                     &brw->vs.prog_offset, &brw->vs.prog_data);
 316    ralloc_free(mem_ctx);
 317
 318    return true;
 319 }
 320
 321 static bool
 322 key_debug(struct intel_context *intel, const char *name, int a, int b)
 323 {
 324    if (a != b) {
 325       perf_debug("  %s %d->%d\n", name, a, b);
 326       return true;
 327    }
 328    return false;
 329 }
 330
 331 void
 332 brw_vs_debug_recompile(struct brw_context *brw,
 333                        struct gl_shader_program *prog,
 334                        const struct brw_vs_prog_key *key)
 335 {
 336    struct intel_context *intel = &brw->intel;
 337    struct brw_cache_item *c = NULL;
 338    const struct brw_vs_prog_key *old_key = NULL;
 339    bool found = false;
 340
 341    perf_debug("Recompiling vertex shader for program %d\n", prog->Name);
 342
 343    for (unsigned int i = 0; i < brw->cache.size; i++) {
 344       for (c = brw->cache.items[i]; c; c = c->next) {
 345          if (c->cache_id == BRW_VS_PROG) {
 346             old_key = c->key;
 347
 348             if (old_key->program_string_id == key->program_string_id)
 349                break;
 350          }
 351       }
 352       if (c)
 353          break;
 354    }
 355
 356    if (!c) {
 357       perf_debug("  Didn't find previous compile in the shader cache for "
 358                  "debug\n");
 359       return;
 360    }
 361
 362    for (unsigned int i = 0; i < VERT_ATTRIB_MAX; i++) {
 363       found |= key_debug(intel, "Vertex attrib w/a flags",
 364                          old_key->gl_attrib_wa_flags[i],
 365                          key->gl_attrib_wa_flags[i]);
 366    }
 367
 368    found |= key_debug(intel, "user clip flags",
 369                       old_key->userclip_active, key->userclip_active);
 370
 371    found |= key_debug(intel, "user clipping planes as push constants",
 372                       old_key->nr_userclip_plane_consts,
 373                       key->nr_userclip_plane_consts);
 374
 375    found |= key_debug(intel, "clip distance enable",
 376                       old_key->uses_clip_distance, key->uses_clip_distance);
 377    found |= key_debug(intel, "clip plane enable bitfield",
 378                       old_key->userclip_planes_enabled_gen_4_5,
 379                       key->userclip_planes_enabled_gen_4_5);
 380    found |= key_debug(intel, "copy edgeflag",
 381                       old_key->copy_edgeflag, key->copy_edgeflag);
 382    found |= key_debug(intel, "PointCoord replace",
 383                       old_key->point_coord_replace, key->point_coord_replace);
 384    found |= key_debug(intel, "vertex color clamping",
 385                       old_key->clamp_vertex_color, key->clamp_vertex_color);
 386
 387    found |= brw_debug_recompile_sampler_key(intel, &old_key->tex, &key->tex);
 388
 389    if (!found) {
 390       perf_debug("  Something else\n");
 391    }
 392 }
 393
 394 static void brw_upload_vs_prog(struct brw_context *brw)
 395 {
 396    struct intel_context *intel = &brw->intel;
 397    struct gl_context *ctx = &intel->ctx;
 398    struct brw_vs_prog_key key;
 399    /* BRW_NEW_VERTEX_PROGRAM */
 400    struct brw_vertex_program *vp =
 401       (struct brw_vertex_program *)brw->vertex_program;
 402    struct gl_program *prog = (struct gl_program *) brw->vertex_program;
 403    int i;
 404
 405    memset(&key, 0, sizeof(key));
 406
 407    /* Just upload the program verbatim for now.  Always send it all
 408     * the inputs it asks for, whether they are varying or not.
 409     */
 410    key.program_string_id = vp->id;
 411    key.userclip_active = (ctx->Transform.ClipPlanesEnabled != 0);
 412    key.uses_clip_distance = vp->program.UsesClipDistance;
 413    if (key.userclip_active && !key.uses_clip_distance) {
 414       if (intel->gen < 6) {
 415          key.nr_userclip_plane_consts
 416             = _mesa_bitcount_64(ctx->Transform.ClipPlanesEnabled);
 417          key.userclip_planes_enabled_gen_4_5
 418             = ctx->Transform.ClipPlanesEnabled;
 419       } else {
 420          key.nr_userclip_plane_consts
 421             = _mesa_logbase2(ctx->Transform.ClipPlanesEnabled) + 1;
 422       }
 423    }
 424
 425    /* _NEW_POLYGON */
 426    if (intel->gen < 6) {
 427       key.copy_edgeflag = (ctx->Polygon.FrontMode != GL_FILL ||
 428                            ctx->Polygon.BackMode != GL_FILL);
 429    }
 430
 431    /* _NEW_LIGHT | _NEW_BUFFERS */
 432    key.clamp_vertex_color = ctx->Light._ClampVertexColor;
 433
 434    /* _NEW_POINT */
 435    if (intel->gen < 6 && ctx->Point.PointSprite) {
 436       for (i = 0; i < 8; i++) {
 437          if (ctx->Point.CoordReplace[i])
 438             key.point_coord_replace |= (1 << i);
 439       }
 440    }
 441
 442    /* _NEW_TEXTURE */
 443    brw_populate_sampler_prog_key_data(ctx, prog, &key.tex);
 444
 445    /* BRW_NEW_VERTICES */
 446    if (intel->gen < 8 && !intel->is_haswell) {
 447       /* Prior to Haswell, the hardware can't natively support GL_FIXED or
 448        * 2_10_10_10_REV vertex formats.  Set appropriate workaround flags.
 449        */
 450       for (i = 0; i < VERT_ATTRIB_MAX; i++) {
 451          if (!(vp->program.Base.InputsRead & BITFIELD64_BIT(i)))
 452             continue;
 453
 454          uint8_t wa_flags = 0;
 455
 456          switch (brw->vb.inputs[i].glarray->Type) {
 457
 458          case GL_FIXED:
 459             wa_flags = brw->vb.inputs[i].glarray->Size;
 460             break;
 461
 462          case GL_INT_2_10_10_10_REV:
 463             wa_flags |= BRW_ATTRIB_WA_SIGN;
 464             /* fallthough */
 465
 466          case GL_UNSIGNED_INT_2_10_10_10_REV:
 467             if (brw->vb.inputs[i].glarray->Format == GL_BGRA)
 468                wa_flags |= BRW_ATTRIB_WA_BGRA;
 469
 470             if (brw->vb.inputs[i].glarray->Normalized)
 471                wa_flags |= BRW_ATTRIB_WA_NORMALIZE;
 472             else if (!brw->vb.inputs[i].glarray->Integer)
 473                wa_flags |= BRW_ATTRIB_WA_SCALE;
 474
 475             break;
 476          }
 477
 478          key.gl_attrib_wa_flags[i] = wa_flags;
 479       }
 480    }
 481
 482    if (!brw_search_cache(&brw->cache, BRW_VS_PROG,
 483                          &key, sizeof(key),
 484                          &brw->vs.prog_offset, &brw->vs.prog_data)) {
 485       bool success = do_vs_prog(brw, ctx->Shader.CurrentVertexProgram,
 486                                 vp, &key);
 487
 488       assert(success);
 489    }
 490 }
 491
 492 /* See brw_vs.c:
 493  */
 494 const struct brw_tracked_state brw_vs_prog = {
 495    .dirty = {
 496       .mesa  = (_NEW_TRANSFORM | _NEW_POLYGON | _NEW_POINT | _NEW_LIGHT |
 497                 _NEW_TEXTURE |
 498                 _NEW_BUFFERS),
 499       .brw   = (BRW_NEW_VERTEX_PROGRAM |
 500                 BRW_NEW_VERTICES),
 501       .cache = 0
 502    },
 503    .emit = brw_upload_vs_prog
 504 };
 505
 506 bool
 507 brw_vs_precompile(struct gl_context *ctx, struct gl_shader_program *prog)
 508 {
 509    struct brw_context *brw = brw_context(ctx);
 510    struct brw_vs_prog_key key;
 511    uint32_t old_prog_offset = brw->vs.prog_offset;
 512    struct brw_vs_prog_data *old_prog_data = brw->vs.prog_data;
 513    bool success;
 514
 515    if (!prog->_LinkedShaders[MESA_SHADER_VERTEX])
 516       return true;
 517
 518    struct gl_vertex_program *vp = (struct gl_vertex_program *)
 519       prog->_LinkedShaders[MESA_SHADER_VERTEX]->Program;
 520    struct brw_vertex_program *bvp = brw_vertex_program(vp);
 521
 522    memset(&key, 0, sizeof(key));
 523
 524    key.program_string_id = bvp->id;
 525    key.clamp_vertex_color = true;
 526
 527    for (int i = 0; i < MAX_SAMPLERS; i++) {
 528       if (vp->Base.ShadowSamplers & (1 << i)) {
 529          /* Assume DEPTH_TEXTURE_MODE is the default: X, X, X, 1 */
 530          key.tex.swizzles[i] =
 531             MAKE_SWIZZLE4(SWIZZLE_X, SWIZZLE_X, SWIZZLE_X, SWIZZLE_ONE);
 532       } else {
 533          /* Color sampler: assume no swizzling. */
 534          key.tex.swizzles[i] = SWIZZLE_XYZW;
 535       }
 536    }
 537
 538    success = do_vs_prog(brw, prog, bvp, &key);
 539
 540    brw->vs.prog_offset = old_prog_offset;
 541    brw->vs.prog_data = old_prog_data;
 542
 543    return success;
 544 }
 545
 546 void
 547 brw_vs_prog_data_free(const void *in_prog_data)
 548 {
 549    const struct brw_vs_prog_data *prog_data = in_prog_data;
 550
 551    ralloc_free((void *)prog_data->param);
 552    ralloc_free((void *)prog_data->pull_param);
 553 }