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 #include "brw_context.h"
  27 #include "brw_wm.h"
  28 #include "brw_state.h"
  29 #include "main/enums.h"
  30 #include "main/formats.h"
  31 #include "main/fbobject.h"
  32 #include "main/samplerobj.h"
  33 #include "main/framebuffer.h"
  34 #include "program/prog_parameter.h"
  35 #include "program/program.h"
  36 #include "intel_mipmap_tree.h"
  37 #include "intel_image.h"
  38 #include "intel_fbo.h"
  39 #include "compiler/brw_nir.h"
  40 #include "brw_program.h"
  41
  42 #include "util/ralloc.h"
  43 #include "util/u_math.h"
  44
  45 static void
  46 assign_fs_binding_table_offsets(const struct gen_device_info *devinfo,
  47                                 const struct gl_program *prog,
  48                                 const struct brw_wm_prog_key *key,
  49                                 struct brw_wm_prog_data *prog_data)
  50 {
  51    /* Render targets implicitly start at surface index 0.  Even if there are
  52     * no color regions, we still perform an FB write to a null render target,
  53     * which will be surface 0.
  54     */
  55    uint32_t next_binding_table_offset = MAX2(key->nr_color_regions, 1);
  56
  57    next_binding_table_offset =
  58       brw_assign_common_binding_table_offsets(devinfo, prog, &prog_data->base,
  59                                               next_binding_table_offset);
  60
  61    if (prog->nir->info.outputs_read && !key->coherent_fb_fetch) {
  62       prog_data->binding_table.render_target_read_start =
  63          next_binding_table_offset;
  64       next_binding_table_offset += key->nr_color_regions;
  65    }
  66 }
  67
  68 static void
  69 brw_wm_debug_recompile(struct brw_context *brw, struct gl_program *prog,
  70                        const struct brw_wm_prog_key *key)
  71 {
  72    perf_debug("Recompiling fragment shader for program %d\n", prog->Id);
  73
  74    bool found = false;
  75    const struct brw_wm_prog_key *old_key =
  76       brw_find_previous_compile(&brw->cache, BRW_CACHE_FS_PROG,
  77                                 key->program_string_id);
  78
  79    if (!old_key) {
  80       perf_debug("  Didn't find previous compile in the shader cache for debug\n");
  81       return;
  82    }
  83
  84    found |= key_debug(brw, "alphatest, computed depth, depth test, or "
  85                       "depth write",
  86                       old_key->iz_lookup, key->iz_lookup);
  87    found |= key_debug(brw, "depth statistics",
  88                       old_key->stats_wm, key->stats_wm);
  89    found |= key_debug(brw, "flat shading",
  90                       old_key->flat_shade, key->flat_shade);
  91    found |= key_debug(brw, "number of color buffers",
  92                       old_key->nr_color_regions, key->nr_color_regions);
  93    found |= key_debug(brw, "MRT alpha test or alpha-to-coverage",
  94                       old_key->replicate_alpha, key->replicate_alpha);
  95    found |= key_debug(brw, "fragment color clamping",
  96                       old_key->clamp_fragment_color, key->clamp_fragment_color);
  97    found |= key_debug(brw, "per-sample interpolation",
  98                       old_key->persample_interp, key->persample_interp);
  99    found |= key_debug(brw, "multisampled FBO",
 100                       old_key->multisample_fbo, key->multisample_fbo);
 101    found |= key_debug(brw, "frag coord adds sample pos",
 102                       old_key->frag_coord_adds_sample_pos,
 103                       key->frag_coord_adds_sample_pos);
 104    found |= key_debug(brw, "line smoothing",
 105                       old_key->line_aa, key->line_aa);
 106    found |= key_debug(brw, "high quality derivatives",
 107                       old_key->high_quality_derivatives,
 108                       key->high_quality_derivatives);
 109    found |= key_debug(brw, "force dual color blending",
 110                       old_key->force_dual_color_blend,
 111                       key->force_dual_color_blend);
 112    found |= key_debug(brw, "coherent fb fetch",
 113                       old_key->coherent_fb_fetch, key->coherent_fb_fetch);
 114
 115    found |= key_debug(brw, "input slots valid",
 116                       old_key->input_slots_valid, key->input_slots_valid);
 117    found |= key_debug(brw, "mrt alpha test function",
 118                       old_key->alpha_test_func, key->alpha_test_func);
 119    found |= key_debug(brw, "mrt alpha test reference value",
 120                       old_key->alpha_test_ref, key->alpha_test_ref);
 121
 122    found |= brw_debug_recompile_sampler_key(brw, &old_key->tex, &key->tex);
 123
 124    if (!found) {
 125       perf_debug("  Something else\n");
 126    }
 127 }
 128
 129 static bool
 130 brw_codegen_wm_prog(struct brw_context *brw,
 131                     struct brw_program *fp,
 132                     struct brw_wm_prog_key *key,
 133                     struct brw_vue_map *vue_map)
 134 {
 135    const struct gen_device_info *devinfo = &brw->screen->devinfo;
 136    void *mem_ctx = ralloc_context(NULL);
 137    struct brw_wm_prog_data prog_data;
 138    const GLuint *program;
 139    bool start_busy = false;
 140    double start_time = 0;
 141
 142    memset(&prog_data, 0, sizeof(prog_data));
 143
 144    /* Use ALT floating point mode for ARB programs so that 0^0 == 1. */
 145    if (fp->program.is_arb_asm)
 146       prog_data.base.use_alt_mode = true;
 147
 148    assign_fs_binding_table_offsets(devinfo, &fp->program, key, &prog_data);
 149
 150    if (!fp->program.is_arb_asm) {
 151       brw_nir_setup_glsl_uniforms(mem_ctx, fp->program.nir, &fp->program,
 152                                   &prog_data.base, true);
 153       brw_nir_analyze_ubo_ranges(brw->screen->compiler, fp->program.nir,
 154                                  NULL, prog_data.base.ubo_ranges);
 155    } else {
 156       brw_nir_setup_arb_uniforms(mem_ctx, fp->program.nir, &fp->program,
 157                                  &prog_data.base);
 158
 159       if (unlikely(INTEL_DEBUG & DEBUG_WM))
 160          brw_dump_arb_asm("fragment", &fp->program);
 161    }
 162
 163    if (unlikely(brw->perf_debug)) {
 164       start_busy = (brw->batch.last_bo &&
 165                     brw_bo_busy(brw->batch.last_bo));
 166       start_time = get_time();
 167    }
 168
 169    int st_index8 = -1, st_index16 = -1, st_index32 = -1;
 170    if (INTEL_DEBUG & DEBUG_SHADER_TIME) {
 171       st_index8 = brw_get_shader_time_index(brw, &fp->program, ST_FS8,
 172                                             !fp->program.is_arb_asm);
 173       st_index16 = brw_get_shader_time_index(brw, &fp->program, ST_FS16,
 174                                              !fp->program.is_arb_asm);
 175       st_index32 = brw_get_shader_time_index(brw, &fp->program, ST_FS32,
 176                                              !fp->program.is_arb_asm);
 177    }
 178
 179    char *error_str = NULL;
 180    program = brw_compile_fs(brw->screen->compiler, brw, mem_ctx,
 181                             key, &prog_data, fp->program.nir,
 182                             &fp->program, st_index8, st_index16, st_index32,
 183                             true, false, vue_map,
 184                             &error_str);
 185
 186    if (program == NULL) {
 187       if (!fp->program.is_arb_asm) {
 188          fp->program.sh.data->LinkStatus = LINKING_FAILURE;
 189          ralloc_strcat(&fp->program.sh.data->InfoLog, error_str);
 190       }
 191
 192       _mesa_problem(NULL, "Failed to compile fragment shader: %s\n", error_str);
 193
 194       ralloc_free(mem_ctx);
 195       return false;
 196    }
 197
 198    if (unlikely(brw->perf_debug)) {
 199       if (fp->compiled_once)
 200          brw_wm_debug_recompile(brw, &fp->program, key);
 201       fp->compiled_once = true;
 202
 203       if (start_busy && !brw_bo_busy(brw->batch.last_bo)) {
 204          perf_debug("FS compile took %.03f ms and stalled the GPU\n",
 205                     (get_time() - start_time) * 1000);
 206       }
 207    }
 208
 209    brw_alloc_stage_scratch(brw, &brw->wm.base, prog_data.base.total_scratch);
 210
 211    if (unlikely((INTEL_DEBUG & DEBUG_WM) && fp->program.is_arb_asm))
 212       fprintf(stderr, "\n");
 213
 214    /* The param and pull_param arrays will be freed by the shader cache. */
 215    ralloc_steal(NULL, prog_data.base.param);
 216    ralloc_steal(NULL, prog_data.base.pull_param);
 217    brw_upload_cache(&brw->cache, BRW_CACHE_FS_PROG,
 218                     key, sizeof(struct brw_wm_prog_key),
 219                     program, prog_data.base.program_size,
 220                     &prog_data, sizeof(prog_data),
 221                     &brw->wm.base.prog_offset, &brw->wm.base.prog_data);
 222
 223    ralloc_free(mem_ctx);
 224
 225    return true;
 226 }
 227
 228 bool
 229 brw_debug_recompile_sampler_key(struct brw_context *brw,
 230                                 const struct brw_sampler_prog_key_data *old_key,
 231                                 const struct brw_sampler_prog_key_data *key)
 232 {
 233    bool found = false;
 234
 235    for (unsigned int i = 0; i < MAX_SAMPLERS; i++) {
 236       found |= key_debug(brw, "EXT_texture_swizzle or DEPTH_TEXTURE_MODE",
 237                          old_key->swizzles[i], key->swizzles[i]);
 238    }
 239    found |= key_debug(brw, "GL_CLAMP enabled on any texture unit's 1st coordinate",
 240                       old_key->gl_clamp_mask[0], key->gl_clamp_mask[0]);
 241    found |= key_debug(brw, "GL_CLAMP enabled on any texture unit's 2nd coordinate",
 242                       old_key->gl_clamp_mask[1], key->gl_clamp_mask[1]);
 243    found |= key_debug(brw, "GL_CLAMP enabled on any texture unit's 3rd coordinate",
 244                       old_key->gl_clamp_mask[2], key->gl_clamp_mask[2]);
 245    found |= key_debug(brw, "gather channel quirk on any texture unit",
 246                       old_key->gather_channel_quirk_mask, key->gather_channel_quirk_mask);
 247    found |= key_debug(brw, "compressed multisample layout",
 248                       old_key->compressed_multisample_layout_mask,
 249                       key->compressed_multisample_layout_mask);
 250    found |= key_debug(brw, "16x msaa",
 251                       old_key->msaa_16,
 252                       key->msaa_16);
 253
 254    found |= key_debug(brw, "y_uv image bound",
 255                       old_key->y_uv_image_mask,
 256                       key->y_uv_image_mask);
 257    found |= key_debug(brw, "y_u_v image bound",
 258                       old_key->y_u_v_image_mask,
 259                       key->y_u_v_image_mask);
 260    found |= key_debug(brw, "yx_xuxv image bound",
 261                       old_key->yx_xuxv_image_mask,
 262                       key->yx_xuxv_image_mask);
 263    found |= key_debug(brw, "xy_uxvx image bound",
 264                       old_key->xy_uxvx_image_mask,
 265                       key->xy_uxvx_image_mask);
 266    found |= key_debug(brw, "ayuv image bound",
 267                       old_key->ayuv_image_mask,
 268                       key->ayuv_image_mask);
 269
 270
 271    for (unsigned int i = 0; i < MAX_SAMPLERS; i++) {
 272       found |= key_debug(brw, "textureGather workarounds",
 273                          old_key->gen6_gather_wa[i], key->gen6_gather_wa[i]);
 274    }
 275
 276    return found;
 277 }
 278
 279 static uint8_t
 280 gen6_gather_workaround(GLenum internalformat)
 281 {
 282    switch (internalformat) {
 283    case GL_R8I: return WA_SIGN | WA_8BIT;
 284    case GL_R8UI: return WA_8BIT;
 285    case GL_R16I: return WA_SIGN | WA_16BIT;
 286    case GL_R16UI: return WA_16BIT;
 287    default:
 288       /* Note that even though GL_R32I and GL_R32UI have format overrides in
 289        * the surface state, there is no shader w/a required.
 290        */
 291       return 0;
 292    }
 293 }
 294
 295 void
 296 brw_populate_sampler_prog_key_data(struct gl_context *ctx,
 297                                    const struct gl_program *prog,
 298                                    struct brw_sampler_prog_key_data *key)
 299 {
 300    struct brw_context *brw = brw_context(ctx);
 301    const struct gen_device_info *devinfo = &brw->screen->devinfo;
 302    GLbitfield mask = prog->SamplersUsed;
 303
 304    while (mask) {
 305       const int s = u_bit_scan(&mask);
 306
 307       key->swizzles[s] = SWIZZLE_NOOP;
 308
 309       int unit_id = prog->SamplerUnits[s];
 310       const struct gl_texture_unit *unit = &ctx->Texture.Unit[unit_id];
 311
 312       if (unit->_Current && unit->_Current->Target != GL_TEXTURE_BUFFER) {
 313          const struct gl_texture_object *t = unit->_Current;
 314          const struct gl_texture_image *img = t->Image[0][t->BaseLevel];
 315          struct gl_sampler_object *sampler = _mesa_get_samplerobj(ctx, unit_id);
 316
 317          const bool alpha_depth = t->DepthMode == GL_ALPHA &&
 318             (img->_BaseFormat == GL_DEPTH_COMPONENT ||
 319              img->_BaseFormat == GL_DEPTH_STENCIL);
 320
 321          /* Haswell handles texture swizzling as surface format overrides
 322           * (except for GL_ALPHA); all other platforms need MOVs in the shader.
 323           */
 324          if (alpha_depth || (devinfo->gen < 8 && !devinfo->is_haswell))
 325             key->swizzles[s] = brw_get_texture_swizzle(ctx, t);
 326
 327          if (devinfo->gen < 8 &&
 328              sampler->MinFilter != GL_NEAREST &&
 329              sampler->MagFilter != GL_NEAREST) {
 330             if (sampler->WrapS == GL_CLAMP)
 331                key->gl_clamp_mask[0] |= 1 << s;
 332             if (sampler->WrapT == GL_CLAMP)
 333                key->gl_clamp_mask[1] |= 1 << s;
 334             if (sampler->WrapR == GL_CLAMP)
 335                key->gl_clamp_mask[2] |= 1 << s;
 336          }
 337
 338          /* gather4 for RG32* is broken in multiple ways on Gen7. */
 339          if (devinfo->gen == 7 && prog->info.uses_texture_gather) {
 340             switch (img->InternalFormat) {
 341             case GL_RG32I:
 342             case GL_RG32UI: {
 343                /* We have to override the format to R32G32_FLOAT_LD.
 344                 * This means that SCS_ALPHA and SCS_ONE will return 0x3f8
 345                 * (1.0) rather than integer 1.  This needs shader hacks.
 346                 *
 347                 * On Ivybridge, we whack W (alpha) to ONE in our key's
 348                 * swizzle.  On Haswell, we look at the original texture
 349                 * swizzle, and use XYZW with channels overridden to ONE,
 350                 * leaving normal texture swizzling to SCS.
 351                 */
 352                unsigned src_swizzle =
 353                   devinfo->is_haswell ? t->_Swizzle : key->swizzles[s];
 354                for (int i = 0; i < 4; i++) {
 355                   unsigned src_comp = GET_SWZ(src_swizzle, i);
 356                   if (src_comp == SWIZZLE_ONE || src_comp == SWIZZLE_W) {
 357                      key->swizzles[i] &= ~(0x7 << (3 * i));
 358                      key->swizzles[i] |= SWIZZLE_ONE << (3 * i);
 359                   }
 360                }
 361                /* fallthrough */
 362             }
 363             case GL_RG32F:
 364                /* The channel select for green doesn't work - we have to
 365                 * request blue.  Haswell can use SCS for this, but Ivybridge
 366                 * needs a shader workaround.
 367                 */
 368                if (!devinfo->is_haswell)
 369                   key->gather_channel_quirk_mask |= 1 << s;
 370                break;
 371             }
 372          }
 373
 374          /* Gen6's gather4 is broken for UINT/SINT; we treat them as
 375           * UNORM/FLOAT instead and fix it in the shader.
 376           */
 377          if (devinfo->gen == 6 && prog->info.uses_texture_gather) {
 378             key->gen6_gather_wa[s] = gen6_gather_workaround(img->InternalFormat);
 379          }
 380
 381          /* If this is a multisample sampler, and uses the CMS MSAA layout,
 382           * then we need to emit slightly different code to first sample the
 383           * MCS surface.
 384           */
 385          struct intel_texture_object *intel_tex =
 386             intel_texture_object((struct gl_texture_object *)t);
 387
 388          /* From gen9 onwards some single sampled buffers can also be
 389           * compressed. These don't need ld2dms sampling along with mcs fetch.
 390           */
 391          if (intel_tex->mt->aux_usage == ISL_AUX_USAGE_MCS) {
 392             assert(devinfo->gen >= 7);
 393             assert(intel_tex->mt->surf.samples > 1);
 394             assert(intel_tex->mt->aux_buf);
 395             assert(intel_tex->mt->surf.msaa_layout == ISL_MSAA_LAYOUT_ARRAY);
 396             key->compressed_multisample_layout_mask |= 1 << s;
 397
 398             if (intel_tex->mt->surf.samples >= 16) {
 399                assert(devinfo->gen >= 9);
 400                key->msaa_16 |= 1 << s;
 401             }
 402          }
 403
 404          if (t->Target == GL_TEXTURE_EXTERNAL_OES && intel_tex->planar_format) {
 405             switch (intel_tex->planar_format->components) {
 406             case __DRI_IMAGE_COMPONENTS_Y_UV:
 407                key->y_uv_image_mask |= 1 << s;
 408                break;
 409             case __DRI_IMAGE_COMPONENTS_Y_U_V:
 410                key->y_u_v_image_mask |= 1 << s;
 411                break;
 412             case __DRI_IMAGE_COMPONENTS_Y_XUXV:
 413                key->yx_xuxv_image_mask |= 1 << s;
 414                break;
 415             case __DRI_IMAGE_COMPONENTS_Y_UXVX:
 416                key->xy_uxvx_image_mask |= 1 << s;
 417                break;
 418             case __DRI_IMAGE_COMPONENTS_AYUV:
 419                key->ayuv_image_mask |= 1 << s;
 420                break;
 421             default:
 422                break;
 423             }
 424          }
 425
 426       }
 427    }
 428 }
 429
 430 static bool
 431 brw_wm_state_dirty(const struct brw_context *brw)
 432 {
 433    return brw_state_dirty(brw,
 434                           _NEW_BUFFERS |
 435                           _NEW_COLOR |
 436                           _NEW_DEPTH |
 437                           _NEW_FRAG_CLAMP |
 438                           _NEW_HINT |
 439                           _NEW_LIGHT |
 440                           _NEW_LINE |
 441                           _NEW_MULTISAMPLE |
 442                           _NEW_POLYGON |
 443                           _NEW_STENCIL |
 444                           _NEW_TEXTURE,
 445                           BRW_NEW_FRAGMENT_PROGRAM |
 446                           BRW_NEW_REDUCED_PRIMITIVE |
 447                           BRW_NEW_STATS_WM |
 448                           BRW_NEW_VUE_MAP_GEOM_OUT);
 449 }
 450
 451 void
 452 brw_wm_populate_key(struct brw_context *brw, struct brw_wm_prog_key *key)
 453 {
 454    const struct gen_device_info *devinfo = &brw->screen->devinfo;
 455    struct gl_context *ctx = &brw->ctx;
 456    /* BRW_NEW_FRAGMENT_PROGRAM */
 457    const struct gl_program *prog = brw->programs[MESA_SHADER_FRAGMENT];
 458    const struct brw_program *fp = brw_program_const(prog);
 459    GLuint lookup = 0;
 460    GLuint line_aa;
 461
 462    memset(key, 0, sizeof(*key));
 463
 464    /* Build the index for table lookup
 465     */
 466    if (devinfo->gen < 6) {
 467       struct intel_renderbuffer *depth_irb =
 468          intel_get_renderbuffer(ctx->DrawBuffer, BUFFER_DEPTH);
 469
 470       /* _NEW_COLOR */
 471       if (prog->info.fs.uses_discard || ctx->Color.AlphaEnabled) {
 472          lookup |= BRW_WM_IZ_PS_KILL_ALPHATEST_BIT;
 473       }
 474
 475       if (prog->info.outputs_written & BITFIELD64_BIT(FRAG_RESULT_DEPTH)) {
 476          lookup |= BRW_WM_IZ_PS_COMPUTES_DEPTH_BIT;
 477       }
 478
 479       /* _NEW_DEPTH */
 480       if (depth_irb && ctx->Depth.Test) {
 481          lookup |= BRW_WM_IZ_DEPTH_TEST_ENABLE_BIT;
 482
 483          if (brw_depth_writes_enabled(brw))
 484             lookup |= BRW_WM_IZ_DEPTH_WRITE_ENABLE_BIT;
 485       }
 486
 487       /* _NEW_STENCIL | _NEW_BUFFERS */
 488       if (brw->stencil_enabled) {
 489          lookup |= BRW_WM_IZ_STENCIL_TEST_ENABLE_BIT;
 490
 491          if (ctx->Stencil.WriteMask[0] ||
 492              ctx->Stencil.WriteMask[ctx->Stencil._BackFace])
 493             lookup |= BRW_WM_IZ_STENCIL_WRITE_ENABLE_BIT;
 494       }
 495       key->iz_lookup = lookup;
 496    }
 497
 498    line_aa = BRW_WM_AA_NEVER;
 499
 500    /* _NEW_LINE, _NEW_POLYGON, BRW_NEW_REDUCED_PRIMITIVE */
 501    if (ctx->Line.SmoothFlag) {
 502       if (brw->reduced_primitive == GL_LINES) {
 503          line_aa = BRW_WM_AA_ALWAYS;
 504       }
 505       else if (brw->reduced_primitive == GL_TRIANGLES) {
 506          if (ctx->Polygon.FrontMode == GL_LINE) {
 507             line_aa = BRW_WM_AA_SOMETIMES;
 508
 509             if (ctx->Polygon.BackMode == GL_LINE ||
 510                 (ctx->Polygon.CullFlag &&
 511                  ctx->Polygon.CullFaceMode == GL_BACK))
 512                line_aa = BRW_WM_AA_ALWAYS;
 513          }
 514          else if (ctx->Polygon.BackMode == GL_LINE) {
 515             line_aa = BRW_WM_AA_SOMETIMES;
 516
 517             if ((ctx->Polygon.CullFlag &&
 518                  ctx->Polygon.CullFaceMode == GL_FRONT))
 519                line_aa = BRW_WM_AA_ALWAYS;
 520          }
 521       }
 522    }
 523
 524    key->line_aa = line_aa;
 525
 526    /* _NEW_HINT */
 527    key->high_quality_derivatives =
 528       prog->info.uses_fddx_fddy &&
 529       ctx->Hint.FragmentShaderDerivative == GL_NICEST;
 530
 531    if (devinfo->gen < 6)
 532       key->stats_wm = brw->stats_wm;
 533
 534    /* _NEW_LIGHT */
 535    key->flat_shade =
 536       (prog->info.inputs_read & (VARYING_BIT_COL0 | VARYING_BIT_COL1)) &&
 537       (ctx->Light.ShadeModel == GL_FLAT);
 538
 539    /* _NEW_FRAG_CLAMP | _NEW_BUFFERS */
 540    key->clamp_fragment_color = ctx->Color._ClampFragmentColor;
 541
 542    /* _NEW_TEXTURE */
 543    brw_populate_sampler_prog_key_data(ctx, prog, &key->tex);
 544
 545    /* _NEW_BUFFERS */
 546    key->nr_color_regions = ctx->DrawBuffer->_NumColorDrawBuffers;
 547
 548    /* _NEW_COLOR */
 549    key->force_dual_color_blend = brw->dual_color_blend_by_location &&
 550       (ctx->Color.BlendEnabled & 1) && ctx->Color.Blend[0]._UsesDualSrc;
 551
 552    /* _NEW_MULTISAMPLE, _NEW_COLOR, _NEW_BUFFERS */
 553    key->replicate_alpha = ctx->DrawBuffer->_NumColorDrawBuffers > 1 &&
 554       (_mesa_is_alpha_test_enabled(ctx) ||
 555        _mesa_is_alpha_to_coverage_enabled(ctx));
 556
 557    /* _NEW_BUFFERS _NEW_MULTISAMPLE */
 558    /* Ignore sample qualifier while computing this flag. */
 559    if (ctx->Multisample.Enabled) {
 560       key->persample_interp =
 561          ctx->Multisample.SampleShading &&
 562          (ctx->Multisample.MinSampleShadingValue *
 563           _mesa_geometric_samples(ctx->DrawBuffer) > 1);
 564
 565       key->multisample_fbo = _mesa_geometric_samples(ctx->DrawBuffer) > 1;
 566    }
 567
 568    /* BRW_NEW_VUE_MAP_GEOM_OUT */
 569    if (devinfo->gen < 6 || util_bitcount64(prog->info.inputs_read &
 570                                              BRW_FS_VARYING_INPUT_MASK) > 16) {
 571       key->input_slots_valid = brw->vue_map_geom_out.slots_valid;
 572    }
 573
 574    /* _NEW_COLOR | _NEW_BUFFERS */
 575    /* Pre-gen6, the hardware alpha test always used each render
 576     * target's alpha to do alpha test, as opposed to render target 0's alpha
 577     * like GL requires.  Fix that by building the alpha test into the
 578     * shader, and we'll skip enabling the fixed function alpha test.
 579     */
 580    if (devinfo->gen < 6 && ctx->DrawBuffer->_NumColorDrawBuffers > 1 &&
 581        ctx->Color.AlphaEnabled) {
 582       key->alpha_test_func = ctx->Color.AlphaFunc;
 583       key->alpha_test_ref = ctx->Color.AlphaRef;
 584    }
 585
 586    /* The unique fragment program ID */
 587    key->program_string_id = fp->id;
 588
 589    /* Whether reads from the framebuffer should behave coherently. */
 590    key->coherent_fb_fetch = ctx->Extensions.EXT_shader_framebuffer_fetch;
 591 }
 592
 593 void
 594 brw_upload_wm_prog(struct brw_context *brw)
 595 {
 596    struct brw_wm_prog_key key;
 597    struct brw_program *fp =
 598       (struct brw_program *) brw->programs[MESA_SHADER_FRAGMENT];
 599
 600    if (!brw_wm_state_dirty(brw))
 601       return;
 602
 603    brw_wm_populate_key(brw, &key);
 604
 605    if (brw_search_cache(&brw->cache, BRW_CACHE_FS_PROG, &key, sizeof(key),
 606                         &brw->wm.base.prog_offset, &brw->wm.base.prog_data,
 607                         true))
 608       return;
 609
 610    if (brw_disk_cache_upload_program(brw, MESA_SHADER_FRAGMENT))
 611       return;
 612
 613    fp = (struct brw_program *) brw->programs[MESA_SHADER_FRAGMENT];
 614    fp->id = key.program_string_id;
 615
 616    MAYBE_UNUSED bool success = brw_codegen_wm_prog(brw, fp, &key,
 617                                                    &brw->vue_map_geom_out);
 618    assert(success);
 619 }
 620
 621 void
 622 brw_wm_populate_default_key(const struct gen_device_info *devinfo,
 623                             struct brw_wm_prog_key *key,
 624                             struct gl_program *prog)
 625 {
 626    memset(key, 0, sizeof(*key));
 627
 628    uint64_t outputs_written = prog->info.outputs_written;
 629
 630    if (devinfo->gen < 6) {
 631       if (prog->info.fs.uses_discard)
 632          key->iz_lookup |= BRW_WM_IZ_PS_KILL_ALPHATEST_BIT;
 633
 634       if (outputs_written & BITFIELD64_BIT(FRAG_RESULT_DEPTH))
 635          key->iz_lookup |= BRW_WM_IZ_PS_COMPUTES_DEPTH_BIT;
 636
 637       /* Just assume depth testing. */
 638       key->iz_lookup |= BRW_WM_IZ_DEPTH_TEST_ENABLE_BIT;
 639       key->iz_lookup |= BRW_WM_IZ_DEPTH_WRITE_ENABLE_BIT;
 640    }
 641
 642    if (devinfo->gen < 6 || util_bitcount64(prog->info.inputs_read &
 643                                              BRW_FS_VARYING_INPUT_MASK) > 16) {
 644       key->input_slots_valid = prog->info.inputs_read | VARYING_BIT_POS;
 645    }
 646
 647    brw_setup_tex_for_precompile(devinfo, &key->tex, prog);
 648
 649    key->nr_color_regions = util_bitcount64(outputs_written &
 650          ~(BITFIELD64_BIT(FRAG_RESULT_DEPTH) |
 651            BITFIELD64_BIT(FRAG_RESULT_STENCIL) |
 652            BITFIELD64_BIT(FRAG_RESULT_SAMPLE_MASK)));
 653
 654    key->program_string_id = brw_program(prog)->id;
 655
 656    /* Whether reads from the framebuffer should behave coherently. */
 657    key->coherent_fb_fetch = devinfo->gen >= 9;
 658 }
 659
 660 bool
 661 brw_fs_precompile(struct gl_context *ctx, struct gl_program *prog)
 662 {
 663    struct brw_context *brw = brw_context(ctx);
 664    const struct gen_device_info *devinfo = &brw->screen->devinfo;
 665    struct brw_wm_prog_key key;
 666
 667    struct brw_program *bfp = brw_program(prog);
 668
 669    brw_wm_populate_default_key(&brw->screen->devinfo, &key, prog);
 670
 671    /* check brw_wm_populate_default_key coherent_fb_fetch setting */
 672    assert(key.coherent_fb_fetch ==
 673           ctx->Extensions.EXT_shader_framebuffer_fetch);
 674
 675    uint32_t old_prog_offset = brw->wm.base.prog_offset;
 676    struct brw_stage_prog_data *old_prog_data = brw->wm.base.prog_data;
 677
 678    struct brw_vue_map vue_map;
 679    if (devinfo->gen < 6) {
 680       brw_compute_vue_map(&brw->screen->devinfo, &vue_map,
 681                           prog->info.inputs_read | VARYING_BIT_POS,
 682                           false);
 683    }
 684
 685    bool success = brw_codegen_wm_prog(brw, bfp, &key, &vue_map);
 686
 687    brw->wm.base.prog_offset = old_prog_offset;
 688    brw->wm.base.prog_data = old_prog_data;
 689
 690    return success;
 691 }