src/mesa/drivers/dri/i965/brw_wm.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 #include "brw_context.h"
  33 #include "brw_wm.h"
  34 #include "brw_state.h"
  35 #include "main/enums.h"
  36 #include "main/formats.h"
  37 #include "main/fbobject.h"
  38 #include "main/samplerobj.h"
  39 #include "program/prog_parameter.h"
  40
  41 #include "glsl/ralloc.h"
  42
  43 /**
  44  * Return a bitfield where bit n is set if barycentric interpolation mode n
  45  * (see enum brw_wm_barycentric_interp_mode) is needed by the fragment shader.
  46  */
  47 static unsigned
  48 brw_compute_barycentric_interp_modes(struct brw_context *brw,
  49                                      bool shade_model_flat,
  50                                      const struct gl_fragment_program *fprog)
  51 {
  52    unsigned barycentric_interp_modes = 0;
  53    int attr;
  54
  55    /* Loop through all fragment shader inputs to figure out what interpolation
  56     * modes are in use, and set the appropriate bits in
  57     * barycentric_interp_modes.
  58     */
  59    for (attr = 0; attr < VARYING_SLOT_MAX; ++attr) {
  60       enum glsl_interp_qualifier interp_qualifier =
  61          fprog->InterpQualifier[attr];
  62       bool is_centroid = fprog->IsCentroid & BITFIELD64_BIT(attr);
  63       bool is_gl_Color = attr == VARYING_SLOT_COL0 || attr == VARYING_SLOT_COL1;
  64
  65       /* Ignore unused inputs. */
  66       if (!(fprog->Base.InputsRead & BITFIELD64_BIT(attr)))
  67          continue;
  68
  69       /* Ignore WPOS and FACE, because they don't require interpolation. */
  70       if (attr == VARYING_SLOT_POS || attr == VARYING_SLOT_FACE)
  71          continue;
  72
  73       /* Determine the set (or sets) of barycentric coordinates needed to
  74        * interpolate this variable.  Note that when
  75        * brw->needs_unlit_centroid_workaround is set, centroid interpolation
  76        * uses PIXEL interpolation for unlit pixels and CENTROID interpolation
  77        * for lit pixels, so we need both sets of barycentric coordinates.
  78        */
  79       if (interp_qualifier == INTERP_QUALIFIER_NOPERSPECTIVE) {
  80          if (is_centroid) {
  81             barycentric_interp_modes |=
  82                1 << BRW_WM_NONPERSPECTIVE_CENTROID_BARYCENTRIC;
  83          }
  84          if (!is_centroid || brw->needs_unlit_centroid_workaround) {
  85             barycentric_interp_modes |=
  86                1 << BRW_WM_NONPERSPECTIVE_PIXEL_BARYCENTRIC;
  87          }
  88       } else if (interp_qualifier == INTERP_QUALIFIER_SMOOTH ||
  89                  (!(shade_model_flat && is_gl_Color) &&
  90                   interp_qualifier == INTERP_QUALIFIER_NONE)) {
  91          if (is_centroid) {
  92             barycentric_interp_modes |=
  93                1 << BRW_WM_PERSPECTIVE_CENTROID_BARYCENTRIC;
  94          }
  95          if (!is_centroid || brw->needs_unlit_centroid_workaround) {
  96             barycentric_interp_modes |=
  97                1 << BRW_WM_PERSPECTIVE_PIXEL_BARYCENTRIC;
  98          }
  99       }
 100    }
 101
 102    return barycentric_interp_modes;
 103 }
 104
 105 bool
 106 brw_wm_prog_data_compare(const void *in_a, const void *in_b,
 107                          int aux_size, const void *in_key)
 108 {
 109    const struct brw_wm_prog_data *a = in_a;
 110    const struct brw_wm_prog_data *b = in_b;
 111
 112    /* Compare all the struct up to the pointers. */
 113    if (memcmp(a, b, offsetof(struct brw_wm_prog_data, param)))
 114       return false;
 115
 116    if (memcmp(a->param, b->param, a->nr_params * sizeof(void *)))
 117       return false;
 118
 119    if (memcmp(a->pull_param, b->pull_param, a->nr_pull_params * sizeof(void *)))
 120       return false;
 121
 122    return true;
 123 }
 124
 125 void
 126 brw_wm_prog_data_free(const void *in_prog_data)
 127 {
 128    const struct brw_wm_prog_data *prog_data = in_prog_data;
 129
 130    ralloc_free((void *)prog_data->param);
 131    ralloc_free((void *)prog_data->pull_param);
 132 }
 133
 134 /**
 135  * All Mesa program -> GPU code generation goes through this function.
 136  * Depending on the instructions used (i.e. flow control instructions)
 137  * we'll use one of two code generators.
 138  */
 139 bool do_wm_prog(struct brw_context *brw,
 140                 struct gl_shader_program *prog,
 141                 struct brw_fragment_program *fp,
 142                 struct brw_wm_prog_key *key)
 143 {
 144    struct brw_wm_compile *c;
 145    const GLuint *program;
 146    struct gl_shader *fs = NULL;
 147    GLuint program_size;
 148
 149    if (prog)
 150       fs = prog->_LinkedShaders[MESA_SHADER_FRAGMENT];
 151
 152    c = rzalloc(NULL, struct brw_wm_compile);
 153
 154    /* Allocate the references to the uniforms that will end up in the
 155     * prog_data associated with the compiled program, and which will be freed
 156     * by the state cache.
 157     */
 158    int param_count;
 159    if (fs) {
 160       param_count = fs->num_uniform_components;
 161    } else {
 162       param_count = fp->program.Base.Parameters->NumParameters * 4;
 163    }
 164    /* The backend also sometimes adds params for texture size. */
 165    param_count += 2 * BRW_MAX_TEX_UNIT;
 166    c->prog_data.param = rzalloc_array(NULL, const float *, param_count);
 167    c->prog_data.pull_param = rzalloc_array(NULL, const float *, param_count);
 168
 169    memcpy(&c->key, key, sizeof(*key));
 170
 171    c->prog_data.barycentric_interp_modes =
 172       brw_compute_barycentric_interp_modes(brw, c->key.flat_shade,
 173                                            &fp->program);
 174
 175    program = brw_wm_fs_emit(brw, c, &fp->program, prog, &program_size);
 176    if (program == NULL)
 177       return false;
 178
 179    /* Scratch space is used for register spilling */
 180    if (c->last_scratch) {
 181       perf_debug("Fragment shader triggered register spilling.  "
 182                  "Try reducing the number of live scalar values to "
 183                  "improve performance.\n");
 184
 185       c->prog_data.total_scratch = brw_get_scratch_size(c->last_scratch);
 186
 187       brw_get_scratch_bo(brw, &brw->wm.base.scratch_bo,
 188                          c->prog_data.total_scratch * brw->max_wm_threads);
 189    }
 190
 191    if (unlikely(INTEL_DEBUG & DEBUG_WM))
 192       fprintf(stderr, "\n");
 193
 194    brw_upload_cache(&brw->cache, BRW_WM_PROG,
 195                     &c->key, sizeof(c->key),
 196                     program, program_size,
 197                     &c->prog_data, sizeof(c->prog_data),
 198                     &brw->wm.base.prog_offset, &brw->wm.prog_data);
 199
 200    ralloc_free(c);
 201
 202    return true;
 203 }
 204
 205 static bool
 206 key_debug(struct brw_context *brw, const char *name, int a, int b)
 207 {
 208    if (a != b) {
 209       perf_debug("  %s %d->%d\n", name, a, b);
 210       return true;
 211    } else {
 212       return false;
 213    }
 214 }
 215
 216 bool
 217 brw_debug_recompile_sampler_key(struct brw_context *brw,
 218                                 const struct brw_sampler_prog_key_data *old_key,
 219                                 const struct brw_sampler_prog_key_data *key)
 220 {
 221    bool found = false;
 222
 223    for (unsigned int i = 0; i < MAX_SAMPLERS; i++) {
 224       found |= key_debug(brw, "EXT_texture_swizzle or DEPTH_TEXTURE_MODE",
 225                          old_key->swizzles[i], key->swizzles[i]);
 226    }
 227    found |= key_debug(brw, "GL_CLAMP enabled on any texture unit's 1st coordinate",
 228                       old_key->gl_clamp_mask[0], key->gl_clamp_mask[0]);
 229    found |= key_debug(brw, "GL_CLAMP enabled on any texture unit's 2nd coordinate",
 230                       old_key->gl_clamp_mask[1], key->gl_clamp_mask[1]);
 231    found |= key_debug(brw, "GL_CLAMP enabled on any texture unit's 3rd coordinate",
 232                       old_key->gl_clamp_mask[2], key->gl_clamp_mask[2]);
 233    found |= key_debug(brw, "GL_MESA_ycbcr texturing\n",
 234                       old_key->yuvtex_mask, key->yuvtex_mask);
 235    found |= key_debug(brw, "GL_MESA_ycbcr UV swapping\n",
 236                       old_key->yuvtex_swap_mask, key->yuvtex_swap_mask);
 237    found |= key_debug(brw, "gather channel quirk on any texture unit",
 238                       old_key->gather_channel_quirk_mask, key->gather_channel_quirk_mask);
 239
 240    return found;
 241 }
 242
 243 void
 244 brw_wm_debug_recompile(struct brw_context *brw,
 245                        struct gl_shader_program *prog,
 246                        const struct brw_wm_prog_key *key)
 247 {
 248    struct brw_cache_item *c = NULL;
 249    const struct brw_wm_prog_key *old_key = NULL;
 250    bool found = false;
 251
 252    perf_debug("Recompiling fragment shader for program %d\n", prog->Name);
 253
 254    for (unsigned int i = 0; i < brw->cache.size; i++) {
 255       for (c = brw->cache.items[i]; c; c = c->next) {
 256          if (c->cache_id == BRW_WM_PROG) {
 257             old_key = c->key;
 258
 259             if (old_key->program_string_id == key->program_string_id)
 260                break;
 261          }
 262       }
 263       if (c)
 264          break;
 265    }
 266
 267    if (!c) {
 268       perf_debug("  Didn't find previous compile in the shader cache for debug\n");
 269       return;
 270    }
 271
 272    found |= key_debug(brw, "alphatest, computed depth, depth test, or "
 273                       "depth write",
 274                       old_key->iz_lookup, key->iz_lookup);
 275    found |= key_debug(brw, "depth statistics",
 276                       old_key->stats_wm, key->stats_wm);
 277    found |= key_debug(brw, "flat shading",
 278                       old_key->flat_shade, key->flat_shade);
 279    found |= key_debug(brw, "number of color buffers",
 280                       old_key->nr_color_regions, key->nr_color_regions);
 281    found |= key_debug(brw, "MRT alpha test or alpha-to-coverage",
 282                       old_key->replicate_alpha, key->replicate_alpha);
 283    found |= key_debug(brw, "rendering to FBO",
 284                       old_key->render_to_fbo, key->render_to_fbo);
 285    found |= key_debug(brw, "fragment color clamping",
 286                       old_key->clamp_fragment_color, key->clamp_fragment_color);
 287    found |= key_debug(brw, "line smoothing",
 288                       old_key->line_aa, key->line_aa);
 289    found |= key_debug(brw, "renderbuffer height",
 290                       old_key->drawable_height, key->drawable_height);
 291    found |= key_debug(brw, "input slots valid",
 292                       old_key->input_slots_valid, key->input_slots_valid);
 293
 294    found |= brw_debug_recompile_sampler_key(brw, &old_key->tex, &key->tex);
 295
 296    if (!found) {
 297       perf_debug("  Something else\n");
 298    }
 299 }
 300
 301 void
 302 brw_populate_sampler_prog_key_data(struct gl_context *ctx,
 303                                    const struct gl_program *prog,
 304                                    unsigned sampler_count,
 305                                    struct brw_sampler_prog_key_data *key)
 306 {
 307    struct brw_context *brw = brw_context(ctx);
 308
 309    for (int s = 0; s < sampler_count; s++) {
 310       key->swizzles[s] = SWIZZLE_NOOP;
 311
 312       if (!(prog->SamplersUsed & (1 << s)))
 313          continue;
 314
 315       int unit_id = prog->SamplerUnits[s];
 316       const struct gl_texture_unit *unit = &ctx->Texture.Unit[unit_id];
 317
 318       if (unit->_ReallyEnabled && unit->_Current->Target != GL_TEXTURE_BUFFER) {
 319          const struct gl_texture_object *t = unit->_Current;
 320          const struct gl_texture_image *img = t->Image[0][t->BaseLevel];
 321          struct gl_sampler_object *sampler = _mesa_get_samplerobj(ctx, unit_id);
 322
 323          const bool alpha_depth = t->DepthMode == GL_ALPHA &&
 324             (img->_BaseFormat == GL_DEPTH_COMPONENT ||
 325              img->_BaseFormat == GL_DEPTH_STENCIL);
 326
 327          /* Haswell handles texture swizzling as surface format overrides
 328           * (except for GL_ALPHA); all other platforms need MOVs in the shader.
 329           */
 330          if (!brw->is_haswell || alpha_depth)
 331             key->swizzles[s] = brw_get_texture_swizzle(ctx, t);
 332
 333          if (img->InternalFormat == GL_YCBCR_MESA) {
 334             key->yuvtex_mask |= 1 << s;
 335             if (img->TexFormat == MESA_FORMAT_YCBCR)
 336                 key->yuvtex_swap_mask |= 1 << s;
 337          }
 338
 339          if (sampler->MinFilter != GL_NEAREST &&
 340              sampler->MagFilter != GL_NEAREST) {
 341             if (sampler->WrapS == GL_CLAMP)
 342                key->gl_clamp_mask[0] |= 1 << s;
 343             if (sampler->WrapT == GL_CLAMP)
 344                key->gl_clamp_mask[1] |= 1 << s;
 345             if (sampler->WrapR == GL_CLAMP)
 346                key->gl_clamp_mask[2] |= 1 << s;
 347          }
 348
 349          /* gather4's channel select for green from RG32F is broken;
 350           * requires a shader w/a on IVB; fixable with just SCS on HSW. */
 351          if (brw->gen >= 7 && !brw->is_haswell && prog->UsesGather) {
 352             if (img->InternalFormat == GL_RG32F)
 353                key->gather_channel_quirk_mask |= 1 << s;
 354          }
 355       }
 356    }
 357 }
 358
 359 static void brw_wm_populate_key( struct brw_context *brw,
 360                                  struct brw_wm_prog_key *key )
 361 {
 362    struct gl_context *ctx = &brw->ctx;
 363    /* BRW_NEW_FRAGMENT_PROGRAM */
 364    const struct brw_fragment_program *fp =
 365       (struct brw_fragment_program *)brw->fragment_program;
 366    const struct gl_program *prog = (struct gl_program *) brw->fragment_program;
 367    GLuint lookup = 0;
 368    GLuint line_aa;
 369    bool program_uses_dfdy = fp->program.UsesDFdy;
 370
 371    memset(key, 0, sizeof(*key));
 372
 373    /* Build the index for table lookup
 374     */
 375    if (brw->gen < 6) {
 376       /* _NEW_COLOR */
 377       if (fp->program.UsesKill || ctx->Color.AlphaEnabled)
 378          lookup |= IZ_PS_KILL_ALPHATEST_BIT;
 379
 380       if (fp->program.Base.OutputsWritten & BITFIELD64_BIT(FRAG_RESULT_DEPTH))
 381          lookup |= IZ_PS_COMPUTES_DEPTH_BIT;
 382
 383       /* _NEW_DEPTH */
 384       if (ctx->Depth.Test)
 385          lookup |= IZ_DEPTH_TEST_ENABLE_BIT;
 386
 387       if (ctx->Depth.Test && ctx->Depth.Mask) /* ?? */
 388          lookup |= IZ_DEPTH_WRITE_ENABLE_BIT;
 389
 390       /* _NEW_STENCIL | _NEW_BUFFERS */
 391       if (ctx->Stencil._Enabled) {
 392          lookup |= IZ_STENCIL_TEST_ENABLE_BIT;
 393
 394          if (ctx->Stencil.WriteMask[0] ||
 395              ctx->Stencil.WriteMask[ctx->Stencil._BackFace])
 396             lookup |= IZ_STENCIL_WRITE_ENABLE_BIT;
 397       }
 398       key->iz_lookup = lookup;
 399    }
 400
 401    line_aa = AA_NEVER;
 402
 403    /* _NEW_LINE, _NEW_POLYGON, BRW_NEW_REDUCED_PRIMITIVE */
 404    if (ctx->Line.SmoothFlag) {
 405       if (brw->reduced_primitive == GL_LINES) {
 406          line_aa = AA_ALWAYS;
 407       }
 408       else if (brw->reduced_primitive == GL_TRIANGLES) {
 409          if (ctx->Polygon.FrontMode == GL_LINE) {
 410             line_aa = AA_SOMETIMES;
 411
 412             if (ctx->Polygon.BackMode == GL_LINE ||
 413                 (ctx->Polygon.CullFlag &&
 414                  ctx->Polygon.CullFaceMode == GL_BACK))
 415                line_aa = AA_ALWAYS;
 416          }
 417          else if (ctx->Polygon.BackMode == GL_LINE) {
 418             line_aa = AA_SOMETIMES;
 419
 420             if ((ctx->Polygon.CullFlag &&
 421                  ctx->Polygon.CullFaceMode == GL_FRONT))
 422                line_aa = AA_ALWAYS;
 423          }
 424       }
 425    }
 426
 427    key->line_aa = line_aa;
 428
 429    /* _NEW_HINT */
 430    if (brw->disable_derivative_optimization) {
 431       key->high_quality_derivatives =
 432          ctx->Hint.FragmentShaderDerivative != GL_FASTEST;
 433    } else {
 434       key->high_quality_derivatives =
 435          ctx->Hint.FragmentShaderDerivative == GL_NICEST;
 436    }
 437
 438    if (brw->gen < 6)
 439       key->stats_wm = brw->stats_wm;
 440
 441    /* _NEW_LIGHT */
 442    key->flat_shade = (ctx->Light.ShadeModel == GL_FLAT);
 443
 444    /* _NEW_FRAG_CLAMP | _NEW_BUFFERS */
 445    key->clamp_fragment_color = ctx->Color._ClampFragmentColor;
 446
 447    /* _NEW_TEXTURE */
 448    brw_populate_sampler_prog_key_data(ctx, prog, brw->wm.base.sampler_count,
 449                                       &key->tex);
 450
 451    /* _NEW_BUFFERS */
 452    /*
 453     * Include the draw buffer origin and height so that we can calculate
 454     * fragment position values relative to the bottom left of the drawable,
 455     * from the incoming screen origin relative position we get as part of our
 456     * payload.
 457     *
 458     * This is only needed for the WM_WPOSXY opcode when the fragment program
 459     * uses the gl_FragCoord input.
 460     *
 461     * We could avoid recompiling by including this as a constant referenced by
 462     * our program, but if we were to do that it would also be nice to handle
 463     * getting that constant updated at batchbuffer submit time (when we
 464     * hold the lock and know where the buffer really is) rather than at emit
 465     * time when we don't hold the lock and are just guessing.  We could also
 466     * just avoid using this as key data if the program doesn't use
 467     * fragment.position.
 468     *
 469     * For DRI2 the origin_x/y will always be (0,0) but we still need the
 470     * drawable height in order to invert the Y axis.
 471     */
 472    if (fp->program.Base.InputsRead & VARYING_BIT_POS) {
 473       key->drawable_height = ctx->DrawBuffer->Height;
 474    }
 475
 476    if ((fp->program.Base.InputsRead & VARYING_BIT_POS) || program_uses_dfdy) {
 477       key->render_to_fbo = _mesa_is_user_fbo(ctx->DrawBuffer);
 478    }
 479
 480    /* _NEW_BUFFERS */
 481    key->nr_color_regions = ctx->DrawBuffer->_NumColorDrawBuffers;
 482
 483    /* _NEW_MULTISAMPLE, _NEW_COLOR, _NEW_BUFFERS */
 484    key->replicate_alpha = ctx->DrawBuffer->_NumColorDrawBuffers > 1 &&
 485       (ctx->Multisample.SampleAlphaToCoverage || ctx->Color.AlphaEnabled);
 486
 487    /* BRW_NEW_VUE_MAP_GEOM_OUT */
 488    if (brw->gen < 6 || _mesa_bitcount_64(fp->program.Base.InputsRead &
 489                                          BRW_FS_VARYING_INPUT_MASK) > 16)
 490       key->input_slots_valid = brw->vue_map_geom_out.slots_valid;
 491
 492    /* The unique fragment program ID */
 493    key->program_string_id = fp->id;
 494 }
 495
 496
 497 static void
 498 brw_upload_wm_prog(struct brw_context *brw)
 499 {
 500    struct gl_context *ctx = &brw->ctx;
 501    struct brw_wm_prog_key key;
 502    struct brw_fragment_program *fp = (struct brw_fragment_program *)
 503       brw->fragment_program;
 504
 505    brw_wm_populate_key(brw, &key);
 506
 507    if (!brw_search_cache(&brw->cache, BRW_WM_PROG,
 508                          &key, sizeof(key),
 509                          &brw->wm.base.prog_offset, &brw->wm.prog_data)) {
 510       bool success = do_wm_prog(brw, ctx->Shader._CurrentFragmentProgram, fp,
 511                                 &key);
 512       (void) success;
 513       assert(success);
 514    }
 515 }
 516
 517
 518 const struct brw_tracked_state brw_wm_prog = {
 519    .dirty = {
 520       .mesa  = (_NEW_COLOR |
 521                 _NEW_DEPTH |
 522                 _NEW_STENCIL |
 523                 _NEW_POLYGON |
 524                 _NEW_LINE |
 525                 _NEW_HINT |
 526                 _NEW_LIGHT |
 527                 _NEW_FRAG_CLAMP |
 528                 _NEW_BUFFERS |
 529                 _NEW_TEXTURE |
 530                 _NEW_MULTISAMPLE),
 531       .brw   = (BRW_NEW_FRAGMENT_PROGRAM |
 532                 BRW_NEW_REDUCED_PRIMITIVE |
 533                 BRW_NEW_VUE_MAP_GEOM_OUT |
 534                 BRW_NEW_STATS_WM)
 535    },
 536    .emit = brw_upload_wm_prog
 537 };
 538