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

   1 /*
   2  Copyright (C) Intel Corp.  2006.  All Rights Reserved.
   3  Intel funded Tungsten Graphics 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 <keithw@vmware.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 #include "program/program.h"
  41 #include "intel_mipmap_tree.h"
  42
  43 #include "glsl/ralloc.h"
  44
  45 /**
  46  * Return a bitfield where bit n is set if barycentric interpolation mode n
  47  * (see enum brw_wm_barycentric_interp_mode) is needed by the fragment shader.
  48  */
  49 static unsigned
  50 brw_compute_barycentric_interp_modes(struct brw_context *brw,
  51                                      bool shade_model_flat,
  52                                      bool persample_shading,
  53                                      const struct gl_fragment_program *fprog)
  54 {
  55    unsigned barycentric_interp_modes = 0;
  56    int attr;
  57
  58    /* Loop through all fragment shader inputs to figure out what interpolation
  59     * modes are in use, and set the appropriate bits in
  60     * barycentric_interp_modes.
  61     */
  62    for (attr = 0; attr < VARYING_SLOT_MAX; ++attr) {
  63       enum glsl_interp_qualifier interp_qualifier =
  64          fprog->InterpQualifier[attr];
  65       bool is_centroid = (fprog->IsCentroid & BITFIELD64_BIT(attr)) &&
  66          !persample_shading;
  67       bool is_sample = (fprog->IsSample & BITFIELD64_BIT(attr)) ||
  68          persample_shading;
  69       bool is_gl_Color = attr == VARYING_SLOT_COL0 || attr == VARYING_SLOT_COL1;
  70
  71       /* Ignore unused inputs. */
  72       if (!(fprog->Base.InputsRead & BITFIELD64_BIT(attr)))
  73          continue;
  74
  75       /* Ignore WPOS and FACE, because they don't require interpolation. */
  76       if (attr == VARYING_SLOT_POS || attr == VARYING_SLOT_FACE)
  77          continue;
  78
  79       /* Determine the set (or sets) of barycentric coordinates needed to
  80        * interpolate this variable.  Note that when
  81        * brw->needs_unlit_centroid_workaround is set, centroid interpolation
  82        * uses PIXEL interpolation for unlit pixels and CENTROID interpolation
  83        * for lit pixels, so we need both sets of barycentric coordinates.
  84        */
  85       if (interp_qualifier == INTERP_QUALIFIER_NOPERSPECTIVE) {
  86          if (is_centroid) {
  87             barycentric_interp_modes |=
  88                1 << BRW_WM_NONPERSPECTIVE_CENTROID_BARYCENTRIC;
  89          } else if (is_sample) {
  90             barycentric_interp_modes |=
  91                1 << BRW_WM_NONPERSPECTIVE_SAMPLE_BARYCENTRIC;
  92          }
  93          if ((!is_centroid && !is_sample) ||
  94              brw->needs_unlit_centroid_workaround) {
  95             barycentric_interp_modes |=
  96                1 << BRW_WM_NONPERSPECTIVE_PIXEL_BARYCENTRIC;
  97          }
  98       } else if (interp_qualifier == INTERP_QUALIFIER_SMOOTH ||
  99                  (!(shade_model_flat && is_gl_Color) &&
 100                   interp_qualifier == INTERP_QUALIFIER_NONE)) {
 101          if (is_centroid) {
 102             barycentric_interp_modes |=
 103                1 << BRW_WM_PERSPECTIVE_CENTROID_BARYCENTRIC;
 104          } else if (is_sample) {
 105             barycentric_interp_modes |=
 106                1 << BRW_WM_PERSPECTIVE_SAMPLE_BARYCENTRIC;
 107          }
 108          if ((!is_centroid && !is_sample) ||
 109              brw->needs_unlit_centroid_workaround) {
 110             barycentric_interp_modes |=
 111                1 << BRW_WM_PERSPECTIVE_PIXEL_BARYCENTRIC;
 112          }
 113       }
 114    }
 115
 116    return barycentric_interp_modes;
 117 }
 118
 119 bool
 120 brw_wm_prog_data_compare(const void *in_a, const void *in_b)
 121 {
 122    const struct brw_wm_prog_data *a = in_a;
 123    const struct brw_wm_prog_data *b = in_b;
 124
 125    /* Compare the base structure. */
 126    if (!brw_stage_prog_data_compare(&a->base, &b->base))
 127       return false;
 128
 129    /* Compare the rest of the structure. */
 130    const unsigned offset = sizeof(struct brw_stage_prog_data);
 131    if (memcmp(((char *) a) + offset, ((char *) b) + offset,
 132               sizeof(struct brw_wm_prog_data) - offset))
 133       return false;
 134
 135    return true;
 136 }
 137
 138 /**
 139  * All Mesa program -> GPU code generation goes through this function.
 140  * Depending on the instructions used (i.e. flow control instructions)
 141  * we'll use one of two code generators.
 142  */
 143 bool do_wm_prog(struct brw_context *brw,
 144                 struct gl_shader_program *prog,
 145                 struct brw_fragment_program *fp,
 146                 struct brw_wm_prog_key *key)
 147 {
 148    struct gl_context *ctx = &brw->ctx;
 149    void *mem_ctx = ralloc_context(NULL);
 150    struct brw_wm_prog_data prog_data;
 151    const GLuint *program;
 152    struct gl_shader *fs = NULL;
 153    GLuint program_size;
 154
 155    if (prog)
 156       fs = prog->_LinkedShaders[MESA_SHADER_FRAGMENT];
 157
 158    memset(&prog_data, 0, sizeof(prog_data));
 159
 160    /* Allocate the references to the uniforms that will end up in the
 161     * prog_data associated with the compiled program, and which will be freed
 162     * by the state cache.
 163     */
 164    int param_count;
 165    if (fs) {
 166       param_count = fs->num_uniform_components;
 167    } else {
 168       param_count = fp->program.Base.Parameters->NumParameters * 4;
 169    }
 170    /* The backend also sometimes adds params for texture size. */
 171    param_count += 2 * ctx->Const.Program[MESA_SHADER_FRAGMENT].MaxTextureImageUnits;
 172    prog_data.base.param = rzalloc_array(NULL, const float *, param_count);
 173    prog_data.base.pull_param =
 174    rzalloc_array(NULL, const float *, param_count);
 175    prog_data.base.nr_params = param_count;
 176
 177    prog_data.barycentric_interp_modes =
 178       brw_compute_barycentric_interp_modes(brw, key->flat_shade,
 179                                            key->persample_shading,
 180                                            &fp->program);
 181
 182    program = brw_wm_fs_emit(brw, mem_ctx, key, &prog_data,
 183                             &fp->program, prog, &program_size);
 184    if (program == NULL) {
 185       ralloc_free(mem_ctx);
 186       return false;
 187    }
 188
 189    if (prog_data.total_scratch) {
 190       brw_get_scratch_bo(brw, &brw->wm.base.scratch_bo,
 191                          prog_data.total_scratch * brw->max_wm_threads);
 192    }
 193
 194    if (unlikely(INTEL_DEBUG & DEBUG_WM))
 195       fprintf(stderr, "\n");
 196
 197    brw_upload_cache(&brw->cache, BRW_WM_PROG,
 198                     key, sizeof(struct brw_wm_prog_key),
 199                     program, program_size,
 200                     &prog_data, sizeof(prog_data),
 201                     &brw->wm.base.prog_offset, &brw->wm.prog_data);
 202
 203    ralloc_free(mem_ctx);
 204
 205    return true;
 206 }
 207
 208 static bool
 209 key_debug(struct brw_context *brw, const char *name, int a, int b)
 210 {
 211    if (a != b) {
 212       perf_debug("  %s %d->%d\n", name, a, b);
 213       return true;
 214    } else {
 215       return false;
 216    }
 217 }
 218
 219 bool
 220 brw_debug_recompile_sampler_key(struct brw_context *brw,
 221                                 const struct brw_sampler_prog_key_data *old_key,
 222                                 const struct brw_sampler_prog_key_data *key)
 223 {
 224    bool found = false;
 225
 226    for (unsigned int i = 0; i < MAX_SAMPLERS; i++) {
 227       found |= key_debug(brw, "EXT_texture_swizzle or DEPTH_TEXTURE_MODE",
 228                          old_key->swizzles[i], key->swizzles[i]);
 229    }
 230    found |= key_debug(brw, "GL_CLAMP enabled on any texture unit's 1st coordinate",
 231                       old_key->gl_clamp_mask[0], key->gl_clamp_mask[0]);
 232    found |= key_debug(brw, "GL_CLAMP enabled on any texture unit's 2nd coordinate",
 233                       old_key->gl_clamp_mask[1], key->gl_clamp_mask[1]);
 234    found |= key_debug(brw, "GL_CLAMP enabled on any texture unit's 3rd coordinate",
 235                       old_key->gl_clamp_mask[2], key->gl_clamp_mask[2]);
 236    found |= key_debug(brw, "gather channel quirk on any texture unit",
 237                       old_key->gather_channel_quirk_mask, key->gather_channel_quirk_mask);
 238
 239    return found;
 240 }
 241
 242 void
 243 brw_wm_debug_recompile(struct brw_context *brw,
 244                        struct gl_shader_program *prog,
 245                        const struct brw_wm_prog_key *key)
 246 {
 247    struct brw_cache_item *c = NULL;
 248    const struct brw_wm_prog_key *old_key = NULL;
 249    bool found = false;
 250
 251    perf_debug("Recompiling fragment shader for program %d\n", prog->Name);
 252
 253    for (unsigned int i = 0; i < brw->cache.size; i++) {
 254       for (c = brw->cache.items[i]; c; c = c->next) {
 255          if (c->cache_id == BRW_WM_PROG) {
 256             old_key = c->key;
 257
 258             if (old_key->program_string_id == key->program_string_id)
 259                break;
 260          }
 261       }
 262       if (c)
 263          break;
 264    }
 265
 266    if (!c) {
 267       perf_debug("  Didn't find previous compile in the shader cache for debug\n");
 268       return;
 269    }
 270
 271    found |= key_debug(brw, "alphatest, computed depth, depth test, or "
 272                       "depth write",
 273                       old_key->iz_lookup, key->iz_lookup);
 274    found |= key_debug(brw, "depth statistics",
 275                       old_key->stats_wm, key->stats_wm);
 276    found |= key_debug(brw, "flat shading",
 277                       old_key->flat_shade, key->flat_shade);
 278    found |= key_debug(brw, "number of color buffers",
 279                       old_key->nr_color_regions, key->nr_color_regions);
 280    found |= key_debug(brw, "MRT alpha test or alpha-to-coverage",
 281                       old_key->replicate_alpha, key->replicate_alpha);
 282    found |= key_debug(brw, "rendering to FBO",
 283                       old_key->render_to_fbo, key->render_to_fbo);
 284    found |= key_debug(brw, "fragment color clamping",
 285                       old_key->clamp_fragment_color, key->clamp_fragment_color);
 286    found |= key_debug(brw, "line smoothing",
 287                       old_key->line_aa, key->line_aa);
 288    found |= key_debug(brw, "renderbuffer height",
 289                       old_key->drawable_height, key->drawable_height);
 290    found |= key_debug(brw, "input slots valid",
 291                       old_key->input_slots_valid, key->input_slots_valid);
 292    found |= key_debug(brw, "mrt alpha test function",
 293                       old_key->alpha_test_func, key->alpha_test_func);
 294    found |= key_debug(brw, "mrt alpha test reference value",
 295                       old_key->alpha_test_ref, key->alpha_test_ref);
 296
 297    found |= brw_debug_recompile_sampler_key(brw, &old_key->tex, &key->tex);
 298
 299    if (!found) {
 300       perf_debug("  Something else\n");
 301    }
 302 }
 303
 304 static uint8_t
 305 gen6_gather_workaround(GLenum internalformat)
 306 {
 307    switch (internalformat) {
 308       case GL_R8I: return WA_SIGN | WA_8BIT;
 309       case GL_R8UI: return WA_8BIT;
 310       case GL_R16I: return WA_SIGN | WA_16BIT;
 311       case GL_R16UI: return WA_16BIT;
 312       /* note that even though GL_R32I and GL_R32UI have format overrides
 313        * in the surface state, there is no shader w/a required */
 314       default: return 0;
 315    }
 316 }
 317
 318 void
 319 brw_populate_sampler_prog_key_data(struct gl_context *ctx,
 320                                    const struct gl_program *prog,
 321                                    unsigned sampler_count,
 322                                    struct brw_sampler_prog_key_data *key)
 323 {
 324    struct brw_context *brw = brw_context(ctx);
 325
 326    for (int s = 0; s < sampler_count; s++) {
 327       key->swizzles[s] = SWIZZLE_NOOP;
 328
 329       if (!(prog->SamplersUsed & (1 << s)))
 330          continue;
 331
 332       int unit_id = prog->SamplerUnits[s];
 333       const struct gl_texture_unit *unit = &ctx->Texture.Unit[unit_id];
 334
 335       if (unit->_Current && unit->_Current->Target != GL_TEXTURE_BUFFER) {
 336          const struct gl_texture_object *t = unit->_Current;
 337          const struct gl_texture_image *img = t->Image[0][t->BaseLevel];
 338          struct gl_sampler_object *sampler = _mesa_get_samplerobj(ctx, unit_id);
 339
 340          const bool alpha_depth = t->DepthMode == GL_ALPHA &&
 341             (img->_BaseFormat == GL_DEPTH_COMPONENT ||
 342              img->_BaseFormat == GL_DEPTH_STENCIL);
 343
 344          /* Haswell handles texture swizzling as surface format overrides
 345           * (except for GL_ALPHA); all other platforms need MOVs in the shader.
 346           */
 347          if (alpha_depth || (brw->gen < 8 && !brw->is_haswell))
 348             key->swizzles[s] = brw_get_texture_swizzle(ctx, t);
 349
 350          if (brw->gen < 8 &&
 351              sampler->MinFilter != GL_NEAREST &&
 352              sampler->MagFilter != GL_NEAREST) {
 353             if (sampler->WrapS == GL_CLAMP)
 354                key->gl_clamp_mask[0] |= 1 << s;
 355             if (sampler->WrapT == GL_CLAMP)
 356                key->gl_clamp_mask[1] |= 1 << s;
 357             if (sampler->WrapR == GL_CLAMP)
 358                key->gl_clamp_mask[2] |= 1 << s;
 359          }
 360
 361          /* gather4's channel select for green from RG32F is broken;
 362           * requires a shader w/a on IVB; fixable with just SCS on HSW. */
 363          if (brw->gen == 7 && !brw->is_haswell && prog->UsesGather) {
 364             if (img->InternalFormat == GL_RG32F)
 365                key->gather_channel_quirk_mask |= 1 << s;
 366          }
 367
 368          /* Gen6's gather4 is broken for UINT/SINT; we treat them as
 369           * UNORM/FLOAT instead and fix it in the shader.
 370           */
 371          if (brw->gen == 6 && prog->UsesGather) {
 372             key->gen6_gather_wa[s] = gen6_gather_workaround(img->InternalFormat);
 373          }
 374
 375          /* If this is a multisample sampler, and uses the CMS MSAA layout,
 376           * then we need to emit slightly different code to first sample the
 377           * MCS surface.
 378           */
 379          struct intel_texture_object *intel_tex =
 380             intel_texture_object((struct gl_texture_object *)t);
 381
 382          if (brw->gen >= 7 &&
 383              intel_tex->mt->msaa_layout == INTEL_MSAA_LAYOUT_CMS) {
 384             key->compressed_multisample_layout_mask |= 1 << s;
 385          }
 386       }
 387    }
 388 }
 389
 390 static void brw_wm_populate_key( struct brw_context *brw,
 391                                  struct brw_wm_prog_key *key )
 392 {
 393    struct gl_context *ctx = &brw->ctx;
 394    /* BRW_NEW_FRAGMENT_PROGRAM */
 395    const struct brw_fragment_program *fp =
 396       (struct brw_fragment_program *)brw->fragment_program;
 397    const struct gl_program *prog = (struct gl_program *) brw->fragment_program;
 398    GLuint lookup = 0;
 399    GLuint line_aa;
 400    bool program_uses_dfdy = fp->program.UsesDFdy;
 401    bool multisample_fbo = ctx->DrawBuffer->Visual.samples > 1;
 402
 403    memset(key, 0, sizeof(*key));
 404
 405    /* Build the index for table lookup
 406     */
 407    if (brw->gen < 6) {
 408       /* _NEW_COLOR */
 409       if (fp->program.UsesKill || ctx->Color.AlphaEnabled)
 410          lookup |= IZ_PS_KILL_ALPHATEST_BIT;
 411
 412       if (fp->program.Base.OutputsWritten & BITFIELD64_BIT(FRAG_RESULT_DEPTH))
 413          lookup |= IZ_PS_COMPUTES_DEPTH_BIT;
 414
 415       /* _NEW_DEPTH */
 416       if (ctx->Depth.Test)
 417          lookup |= IZ_DEPTH_TEST_ENABLE_BIT;
 418
 419       if (ctx->Depth.Test && ctx->Depth.Mask) /* ?? */
 420          lookup |= IZ_DEPTH_WRITE_ENABLE_BIT;
 421
 422       /* _NEW_STENCIL | _NEW_BUFFERS */
 423       if (ctx->Stencil._Enabled) {
 424          lookup |= IZ_STENCIL_TEST_ENABLE_BIT;
 425
 426          if (ctx->Stencil.WriteMask[0] ||
 427              ctx->Stencil.WriteMask[ctx->Stencil._BackFace])
 428             lookup |= IZ_STENCIL_WRITE_ENABLE_BIT;
 429       }
 430       key->iz_lookup = lookup;
 431    }
 432
 433    line_aa = AA_NEVER;
 434
 435    /* _NEW_LINE, _NEW_POLYGON, BRW_NEW_REDUCED_PRIMITIVE */
 436    if (ctx->Line.SmoothFlag) {
 437       if (brw->reduced_primitive == GL_LINES) {
 438          line_aa = AA_ALWAYS;
 439       }
 440       else if (brw->reduced_primitive == GL_TRIANGLES) {
 441          if (ctx->Polygon.FrontMode == GL_LINE) {
 442             line_aa = AA_SOMETIMES;
 443
 444             if (ctx->Polygon.BackMode == GL_LINE ||
 445                 (ctx->Polygon.CullFlag &&
 446                  ctx->Polygon.CullFaceMode == GL_BACK))
 447                line_aa = AA_ALWAYS;
 448          }
 449          else if (ctx->Polygon.BackMode == GL_LINE) {
 450             line_aa = AA_SOMETIMES;
 451
 452             if ((ctx->Polygon.CullFlag &&
 453                  ctx->Polygon.CullFaceMode == GL_FRONT))
 454                line_aa = AA_ALWAYS;
 455          }
 456       }
 457    }
 458
 459    key->line_aa = line_aa;
 460
 461    /* _NEW_HINT */
 462    if (brw->disable_derivative_optimization) {
 463       key->high_quality_derivatives =
 464          ctx->Hint.FragmentShaderDerivative != GL_FASTEST;
 465    } else {
 466       key->high_quality_derivatives =
 467          ctx->Hint.FragmentShaderDerivative == GL_NICEST;
 468    }
 469
 470    if (brw->gen < 6)
 471       key->stats_wm = brw->stats_wm;
 472
 473    /* _NEW_LIGHT */
 474    key->flat_shade = (ctx->Light.ShadeModel == GL_FLAT);
 475
 476    /* _NEW_FRAG_CLAMP | _NEW_BUFFERS */
 477    key->clamp_fragment_color = ctx->Color._ClampFragmentColor;
 478
 479    /* _NEW_TEXTURE */
 480    brw_populate_sampler_prog_key_data(ctx, prog, brw->wm.base.sampler_count,
 481                                       &key->tex);
 482
 483    /* _NEW_BUFFERS */
 484    /*
 485     * Include the draw buffer origin and height so that we can calculate
 486     * fragment position values relative to the bottom left of the drawable,
 487     * from the incoming screen origin relative position we get as part of our
 488     * payload.
 489     *
 490     * This is only needed for the WM_WPOSXY opcode when the fragment program
 491     * uses the gl_FragCoord input.
 492     *
 493     * We could avoid recompiling by including this as a constant referenced by
 494     * our program, but if we were to do that it would also be nice to handle
 495     * getting that constant updated at batchbuffer submit time (when we
 496     * hold the lock and know where the buffer really is) rather than at emit
 497     * time when we don't hold the lock and are just guessing.  We could also
 498     * just avoid using this as key data if the program doesn't use
 499     * fragment.position.
 500     *
 501     * For DRI2 the origin_x/y will always be (0,0) but we still need the
 502     * drawable height in order to invert the Y axis.
 503     */
 504    if (fp->program.Base.InputsRead & VARYING_BIT_POS) {
 505       key->drawable_height = ctx->DrawBuffer->Height;
 506    }
 507
 508    if ((fp->program.Base.InputsRead & VARYING_BIT_POS) || program_uses_dfdy) {
 509       key->render_to_fbo = _mesa_is_user_fbo(ctx->DrawBuffer);
 510    }
 511
 512    /* _NEW_BUFFERS */
 513    key->nr_color_regions = ctx->DrawBuffer->_NumColorDrawBuffers;
 514
 515    /* _NEW_MULTISAMPLE, _NEW_COLOR, _NEW_BUFFERS */
 516    key->replicate_alpha = ctx->DrawBuffer->_NumColorDrawBuffers > 1 &&
 517       (ctx->Multisample.SampleAlphaToCoverage || ctx->Color.AlphaEnabled);
 518
 519    /* _NEW_BUFFERS _NEW_MULTISAMPLE */
 520    /* Ignore sample qualifier while computing this flag. */
 521    key->persample_shading =
 522       _mesa_get_min_invocations_per_fragment(ctx, &fp->program, true) > 1;
 523
 524    key->compute_pos_offset =
 525       _mesa_get_min_invocations_per_fragment(ctx, &fp->program, false) > 1 &&
 526       fp->program.Base.SystemValuesRead & SYSTEM_BIT_SAMPLE_POS;
 527
 528    key->compute_sample_id =
 529       multisample_fbo &&
 530       ctx->Multisample.Enabled &&
 531       (fp->program.Base.SystemValuesRead & SYSTEM_BIT_SAMPLE_ID);
 532
 533    /* BRW_NEW_VUE_MAP_GEOM_OUT */
 534    if (brw->gen < 6 || _mesa_bitcount_64(fp->program.Base.InputsRead &
 535                                          BRW_FS_VARYING_INPUT_MASK) > 16)
 536       key->input_slots_valid = brw->vue_map_geom_out.slots_valid;
 537
 538
 539    /* _NEW_COLOR | _NEW_BUFFERS */
 540    /* Pre-gen6, the hardware alpha test always used each render
 541     * target's alpha to do alpha test, as opposed to render target 0's alpha
 542     * like GL requires.  Fix that by building the alpha test into the
 543     * shader, and we'll skip enabling the fixed function alpha test.
 544     */
 545    if (brw->gen < 6 && ctx->DrawBuffer->_NumColorDrawBuffers > 1 && ctx->Color.AlphaEnabled) {
 546       key->alpha_test_func = ctx->Color.AlphaFunc;
 547       key->alpha_test_ref = ctx->Color.AlphaRef;
 548    }
 549
 550    /* The unique fragment program ID */
 551    key->program_string_id = fp->id;
 552 }
 553
 554
 555 static void
 556 brw_upload_wm_prog(struct brw_context *brw)
 557 {
 558    struct gl_context *ctx = &brw->ctx;
 559    struct brw_wm_prog_key key;
 560    struct brw_fragment_program *fp = (struct brw_fragment_program *)
 561       brw->fragment_program;
 562
 563    brw_wm_populate_key(brw, &key);
 564
 565    if (!brw_search_cache(&brw->cache, BRW_WM_PROG,
 566                          &key, sizeof(key),
 567                          &brw->wm.base.prog_offset, &brw->wm.prog_data)) {
 568       bool success = do_wm_prog(brw, ctx->_Shader->_CurrentFragmentProgram, fp,
 569                                 &key);
 570       (void) success;
 571       assert(success);
 572    }
 573    brw->wm.base.prog_data = &brw->wm.prog_data->base;
 574 }
 575
 576
 577 const struct brw_tracked_state brw_wm_prog = {
 578    .dirty = {
 579       .mesa  = (_NEW_COLOR |
 580                 _NEW_DEPTH |
 581                 _NEW_STENCIL |
 582                 _NEW_POLYGON |
 583                 _NEW_LINE |
 584                 _NEW_HINT |
 585                 _NEW_LIGHT |
 586                 _NEW_FRAG_CLAMP |
 587                 _NEW_BUFFERS |
 588                 _NEW_TEXTURE |
 589                 _NEW_MULTISAMPLE),
 590       .brw   = (BRW_NEW_FRAGMENT_PROGRAM |
 591                 BRW_NEW_REDUCED_PRIMITIVE |
 592                 BRW_NEW_VUE_MAP_GEOM_OUT |
 593                 BRW_NEW_STATS_WM)
 594    },
 595    .emit = brw_upload_wm_prog
 596 };
 597