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 "util/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 =
 173       rzalloc_array(NULL, const gl_constant_value *, param_count);
 174    prog_data.base.pull_param =
 175       rzalloc_array(NULL, const gl_constant_value *, param_count);
 176    prog_data.base.nr_params = param_count;
 177
 178    prog_data.barycentric_interp_modes =
 179       brw_compute_barycentric_interp_modes(brw, key->flat_shade,
 180                                            key->persample_shading,
 181                                            &fp->program);
 182
 183    program = brw_wm_fs_emit(brw, mem_ctx, key, &prog_data,
 184                             &fp->program, prog, &program_size);
 185    if (program == NULL) {
 186       ralloc_free(mem_ctx);
 187       return false;
 188    }
 189
 190    if (prog_data.base.total_scratch) {
 191       brw_get_scratch_bo(brw, &brw->wm.base.scratch_bo,
 192                          prog_data.base.total_scratch * brw->max_wm_threads);
 193    }
 194
 195    if (unlikely(INTEL_DEBUG & DEBUG_WM))
 196       fprintf(stderr, "\n");
 197
 198    brw_upload_cache(&brw->cache, BRW_WM_PROG,
 199                     key, sizeof(struct brw_wm_prog_key),
 200                     program, program_size,
 201                     &prog_data, sizeof(prog_data),
 202                     &brw->wm.base.prog_offset, &brw->wm.prog_data);
 203
 204    ralloc_free(mem_ctx);
 205
 206    return true;
 207 }
 208
 209 static bool
 210 key_debug(struct brw_context *brw, const char *name, int a, int b)
 211 {
 212    if (a != b) {
 213       perf_debug("  %s %d->%d\n", name, a, b);
 214       return true;
 215    } else {
 216       return false;
 217    }
 218 }
 219
 220 bool
 221 brw_debug_recompile_sampler_key(struct brw_context *brw,
 222                                 const struct brw_sampler_prog_key_data *old_key,
 223                                 const struct brw_sampler_prog_key_data *key)
 224 {
 225    bool found = false;
 226
 227    for (unsigned int i = 0; i < MAX_SAMPLERS; i++) {
 228       found |= key_debug(brw, "EXT_texture_swizzle or DEPTH_TEXTURE_MODE",
 229                          old_key->swizzles[i], key->swizzles[i]);
 230    }
 231    found |= key_debug(brw, "GL_CLAMP enabled on any texture unit's 1st coordinate",
 232                       old_key->gl_clamp_mask[0], key->gl_clamp_mask[0]);
 233    found |= key_debug(brw, "GL_CLAMP enabled on any texture unit's 2nd coordinate",
 234                       old_key->gl_clamp_mask[1], key->gl_clamp_mask[1]);
 235    found |= key_debug(brw, "GL_CLAMP enabled on any texture unit's 3rd coordinate",
 236                       old_key->gl_clamp_mask[2], key->gl_clamp_mask[2]);
 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, "per-sample shading",
 280                       old_key->persample_shading, key->persample_shading);
 281    found |= key_debug(brw, "per-sample shading and 2x MSAA",
 282                       old_key->persample_2x, key->persample_2x);
 283    found |= key_debug(brw, "number of color buffers",
 284                       old_key->nr_color_regions, key->nr_color_regions);
 285    found |= key_debug(brw, "MRT alpha test or alpha-to-coverage",
 286                       old_key->replicate_alpha, key->replicate_alpha);
 287    found |= key_debug(brw, "rendering to FBO",
 288                       old_key->render_to_fbo, key->render_to_fbo);
 289    found |= key_debug(brw, "fragment color clamping",
 290                       old_key->clamp_fragment_color, key->clamp_fragment_color);
 291    found |= key_debug(brw, "line smoothing",
 292                       old_key->line_aa, key->line_aa);
 293    found |= key_debug(brw, "renderbuffer height",
 294                       old_key->drawable_height, key->drawable_height);
 295    found |= key_debug(brw, "input slots valid",
 296                       old_key->input_slots_valid, key->input_slots_valid);
 297    found |= key_debug(brw, "mrt alpha test function",
 298                       old_key->alpha_test_func, key->alpha_test_func);
 299    found |= key_debug(brw, "mrt alpha test reference value",
 300                       old_key->alpha_test_ref, key->alpha_test_ref);
 301
 302    found |= brw_debug_recompile_sampler_key(brw, &old_key->tex, &key->tex);
 303
 304    if (!found) {
 305       perf_debug("  Something else\n");
 306    }
 307 }
 308
 309 static uint8_t
 310 gen6_gather_workaround(GLenum internalformat)
 311 {
 312    switch (internalformat) {
 313       case GL_R8I: return WA_SIGN | WA_8BIT;
 314       case GL_R8UI: return WA_8BIT;
 315       case GL_R16I: return WA_SIGN | WA_16BIT;
 316       case GL_R16UI: return WA_16BIT;
 317       /* note that even though GL_R32I and GL_R32UI have format overrides
 318        * in the surface state, there is no shader w/a required */
 319       default: return 0;
 320    }
 321 }
 322
 323 void
 324 brw_populate_sampler_prog_key_data(struct gl_context *ctx,
 325                                    const struct gl_program *prog,
 326                                    unsigned sampler_count,
 327                                    struct brw_sampler_prog_key_data *key)
 328 {
 329    struct brw_context *brw = brw_context(ctx);
 330
 331    for (int s = 0; s < sampler_count; s++) {
 332       key->swizzles[s] = SWIZZLE_NOOP;
 333
 334       if (!(prog->SamplersUsed & (1 << s)))
 335          continue;
 336
 337       int unit_id = prog->SamplerUnits[s];
 338       const struct gl_texture_unit *unit = &ctx->Texture.Unit[unit_id];
 339
 340       if (unit->_Current && unit->_Current->Target != GL_TEXTURE_BUFFER) {
 341          const struct gl_texture_object *t = unit->_Current;
 342          const struct gl_texture_image *img = t->Image[0][t->BaseLevel];
 343          struct gl_sampler_object *sampler = _mesa_get_samplerobj(ctx, unit_id);
 344
 345          const bool alpha_depth = t->DepthMode == GL_ALPHA &&
 346             (img->_BaseFormat == GL_DEPTH_COMPONENT ||
 347              img->_BaseFormat == GL_DEPTH_STENCIL);
 348
 349          /* Haswell handles texture swizzling as surface format overrides
 350           * (except for GL_ALPHA); all other platforms need MOVs in the shader.
 351           */
 352          if (alpha_depth || (brw->gen < 8 && !brw->is_haswell))
 353             key->swizzles[s] = brw_get_texture_swizzle(ctx, t);
 354
 355          if (brw->gen < 8 &&
 356              sampler->MinFilter != GL_NEAREST &&
 357              sampler->MagFilter != GL_NEAREST) {
 358             if (sampler->WrapS == GL_CLAMP)
 359                key->gl_clamp_mask[0] |= 1 << s;
 360             if (sampler->WrapT == GL_CLAMP)
 361                key->gl_clamp_mask[1] |= 1 << s;
 362             if (sampler->WrapR == GL_CLAMP)
 363                key->gl_clamp_mask[2] |= 1 << s;
 364          }
 365
 366          /* gather4's channel select for green from RG32F is broken;
 367           * requires a shader w/a on IVB; fixable with just SCS on HSW. */
 368          if (brw->gen == 7 && !brw->is_haswell && prog->UsesGather) {
 369             if (img->InternalFormat == GL_RG32F)
 370                key->gather_channel_quirk_mask |= 1 << s;
 371          }
 372
 373          /* Gen6's gather4 is broken for UINT/SINT; we treat them as
 374           * UNORM/FLOAT instead and fix it in the shader.
 375           */
 376          if (brw->gen == 6 && prog->UsesGather) {
 377             key->gen6_gather_wa[s] = gen6_gather_workaround(img->InternalFormat);
 378          }
 379
 380          /* If this is a multisample sampler, and uses the CMS MSAA layout,
 381           * then we need to emit slightly different code to first sample the
 382           * MCS surface.
 383           */
 384          struct intel_texture_object *intel_tex =
 385             intel_texture_object((struct gl_texture_object *)t);
 386
 387          if (brw->gen >= 7 &&
 388              intel_tex->mt->msaa_layout == INTEL_MSAA_LAYOUT_CMS) {
 389             key->compressed_multisample_layout_mask |= 1 << s;
 390          }
 391       }
 392    }
 393 }
 394
 395 static void brw_wm_populate_key( struct brw_context *brw,
 396                                  struct brw_wm_prog_key *key )
 397 {
 398    struct gl_context *ctx = &brw->ctx;
 399    /* BRW_NEW_FRAGMENT_PROGRAM */
 400    const struct brw_fragment_program *fp =
 401       (struct brw_fragment_program *)brw->fragment_program;
 402    const struct gl_program *prog = (struct gl_program *) brw->fragment_program;
 403    GLuint lookup = 0;
 404    GLuint line_aa;
 405    bool program_uses_dfdy = fp->program.UsesDFdy;
 406    bool multisample_fbo = ctx->DrawBuffer->Visual.samples > 1;
 407
 408    memset(key, 0, sizeof(*key));
 409
 410    /* Build the index for table lookup
 411     */
 412    if (brw->gen < 6) {
 413       /* _NEW_COLOR */
 414       if (fp->program.UsesKill || ctx->Color.AlphaEnabled)
 415          lookup |= IZ_PS_KILL_ALPHATEST_BIT;
 416
 417       if (fp->program.Base.OutputsWritten & BITFIELD64_BIT(FRAG_RESULT_DEPTH))
 418          lookup |= IZ_PS_COMPUTES_DEPTH_BIT;
 419
 420       /* _NEW_DEPTH */
 421       if (ctx->Depth.Test)
 422          lookup |= IZ_DEPTH_TEST_ENABLE_BIT;
 423
 424       if (ctx->Depth.Test && ctx->Depth.Mask) /* ?? */
 425          lookup |= IZ_DEPTH_WRITE_ENABLE_BIT;
 426
 427       /* _NEW_STENCIL | _NEW_BUFFERS */
 428       if (ctx->Stencil._Enabled) {
 429          lookup |= IZ_STENCIL_TEST_ENABLE_BIT;
 430
 431          if (ctx->Stencil.WriteMask[0] ||
 432              ctx->Stencil.WriteMask[ctx->Stencil._BackFace])
 433             lookup |= IZ_STENCIL_WRITE_ENABLE_BIT;
 434       }
 435       key->iz_lookup = lookup;
 436    }
 437
 438    line_aa = AA_NEVER;
 439
 440    /* _NEW_LINE, _NEW_POLYGON, BRW_NEW_REDUCED_PRIMITIVE */
 441    if (ctx->Line.SmoothFlag) {
 442       if (brw->reduced_primitive == GL_LINES) {
 443          line_aa = AA_ALWAYS;
 444       }
 445       else if (brw->reduced_primitive == GL_TRIANGLES) {
 446          if (ctx->Polygon.FrontMode == GL_LINE) {
 447             line_aa = AA_SOMETIMES;
 448
 449             if (ctx->Polygon.BackMode == GL_LINE ||
 450                 (ctx->Polygon.CullFlag &&
 451                  ctx->Polygon.CullFaceMode == GL_BACK))
 452                line_aa = AA_ALWAYS;
 453          }
 454          else if (ctx->Polygon.BackMode == GL_LINE) {
 455             line_aa = AA_SOMETIMES;
 456
 457             if ((ctx->Polygon.CullFlag &&
 458                  ctx->Polygon.CullFaceMode == GL_FRONT))
 459                line_aa = AA_ALWAYS;
 460          }
 461       }
 462    }
 463
 464    key->line_aa = line_aa;
 465
 466    /* _NEW_HINT */
 467    if (brw->disable_derivative_optimization) {
 468       key->high_quality_derivatives =
 469          ctx->Hint.FragmentShaderDerivative != GL_FASTEST;
 470    } else {
 471       key->high_quality_derivatives =
 472          ctx->Hint.FragmentShaderDerivative == GL_NICEST;
 473    }
 474
 475    if (brw->gen < 6)
 476       key->stats_wm = brw->stats_wm;
 477
 478    /* _NEW_LIGHT */
 479    key->flat_shade = (ctx->Light.ShadeModel == GL_FLAT);
 480
 481    /* _NEW_FRAG_CLAMP | _NEW_BUFFERS */
 482    key->clamp_fragment_color = ctx->Color._ClampFragmentColor;
 483
 484    /* _NEW_TEXTURE */
 485    brw_populate_sampler_prog_key_data(ctx, prog, brw->wm.base.sampler_count,
 486                                       &key->tex);
 487
 488    /* _NEW_BUFFERS */
 489    /*
 490     * Include the draw buffer origin and height so that we can calculate
 491     * fragment position values relative to the bottom left of the drawable,
 492     * from the incoming screen origin relative position we get as part of our
 493     * payload.
 494     *
 495     * This is only needed for the WM_WPOSXY opcode when the fragment program
 496     * uses the gl_FragCoord input.
 497     *
 498     * We could avoid recompiling by including this as a constant referenced by
 499     * our program, but if we were to do that it would also be nice to handle
 500     * getting that constant updated at batchbuffer submit time (when we
 501     * hold the lock and know where the buffer really is) rather than at emit
 502     * time when we don't hold the lock and are just guessing.  We could also
 503     * just avoid using this as key data if the program doesn't use
 504     * fragment.position.
 505     *
 506     * For DRI2 the origin_x/y will always be (0,0) but we still need the
 507     * drawable height in order to invert the Y axis.
 508     */
 509    if (fp->program.Base.InputsRead & VARYING_BIT_POS) {
 510       key->drawable_height = ctx->DrawBuffer->Height;
 511    }
 512
 513    if ((fp->program.Base.InputsRead & VARYING_BIT_POS) || program_uses_dfdy) {
 514       key->render_to_fbo = _mesa_is_user_fbo(ctx->DrawBuffer);
 515    }
 516
 517    /* _NEW_BUFFERS */
 518    key->nr_color_regions = ctx->DrawBuffer->_NumColorDrawBuffers;
 519
 520    /* _NEW_MULTISAMPLE, _NEW_COLOR, _NEW_BUFFERS */
 521    key->replicate_alpha = ctx->DrawBuffer->_NumColorDrawBuffers > 1 &&
 522       (ctx->Multisample.SampleAlphaToCoverage || ctx->Color.AlphaEnabled);
 523
 524    /* _NEW_BUFFERS _NEW_MULTISAMPLE */
 525    /* Ignore sample qualifier while computing this flag. */
 526    key->persample_shading =
 527       _mesa_get_min_invocations_per_fragment(ctx, &fp->program, true) > 1;
 528    if (key->persample_shading)
 529       key->persample_2x = ctx->DrawBuffer->Visual.samples == 2;
 530
 531    key->compute_pos_offset =
 532       _mesa_get_min_invocations_per_fragment(ctx, &fp->program, false) > 1 &&
 533       fp->program.Base.SystemValuesRead & SYSTEM_BIT_SAMPLE_POS;
 534
 535    key->compute_sample_id =
 536       multisample_fbo &&
 537       ctx->Multisample.Enabled &&
 538       (fp->program.Base.SystemValuesRead & SYSTEM_BIT_SAMPLE_ID);
 539
 540    /* BRW_NEW_VUE_MAP_GEOM_OUT */
 541    if (brw->gen < 6 || _mesa_bitcount_64(fp->program.Base.InputsRead &
 542                                          BRW_FS_VARYING_INPUT_MASK) > 16)
 543       key->input_slots_valid = brw->vue_map_geom_out.slots_valid;
 544
 545
 546    /* _NEW_COLOR | _NEW_BUFFERS */
 547    /* Pre-gen6, the hardware alpha test always used each render
 548     * target's alpha to do alpha test, as opposed to render target 0's alpha
 549     * like GL requires.  Fix that by building the alpha test into the
 550     * shader, and we'll skip enabling the fixed function alpha test.
 551     */
 552    if (brw->gen < 6 && ctx->DrawBuffer->_NumColorDrawBuffers > 1 && ctx->Color.AlphaEnabled) {
 553       key->alpha_test_func = ctx->Color.AlphaFunc;
 554       key->alpha_test_ref = ctx->Color.AlphaRef;
 555    }
 556
 557    /* The unique fragment program ID */
 558    key->program_string_id = fp->id;
 559 }
 560
 561
 562 static void
 563 brw_upload_wm_prog(struct brw_context *brw)
 564 {
 565    struct gl_context *ctx = &brw->ctx;
 566    struct brw_wm_prog_key key;
 567    struct brw_fragment_program *fp = (struct brw_fragment_program *)
 568       brw->fragment_program;
 569
 570    brw_wm_populate_key(brw, &key);
 571
 572    if (!brw_search_cache(&brw->cache, BRW_WM_PROG,
 573                          &key, sizeof(key),
 574                          &brw->wm.base.prog_offset, &brw->wm.prog_data)) {
 575       bool success = do_wm_prog(brw, ctx->_Shader->_CurrentFragmentProgram, fp,
 576                                 &key);
 577       (void) success;
 578       assert(success);
 579    }
 580    brw->wm.base.prog_data = &brw->wm.prog_data->base;
 581 }
 582
 583
 584 const struct brw_tracked_state brw_wm_prog = {
 585    .dirty = {
 586       .mesa  = (_NEW_COLOR |
 587                 _NEW_DEPTH |
 588                 _NEW_STENCIL |
 589                 _NEW_POLYGON |
 590                 _NEW_LINE |
 591                 _NEW_HINT |
 592                 _NEW_LIGHT |
 593                 _NEW_FRAG_CLAMP |
 594                 _NEW_BUFFERS |
 595                 _NEW_TEXTURE |
 596                 _NEW_MULTISAMPLE),
 597       .brw   = (BRW_NEW_FRAGMENT_PROGRAM |
 598                 BRW_NEW_REDUCED_PRIMITIVE |
 599                 BRW_NEW_VUE_MAP_GEOM_OUT |
 600                 BRW_NEW_STATS_WM)
 601    },
 602    .emit = brw_upload_wm_prog
 603 };
 604