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/formats.h"
  36 #include "main/fbobject.h"
  37 #include "main/samplerobj.h"
  38 #include "program/prog_parameter.h"
  39
  40 #include "glsl/ralloc.h"
  41
  42 /**
  43  * Return a bitfield where bit n is set if barycentric interpolation mode n
  44  * (see enum brw_wm_barycentric_interp_mode) is needed by the fragment shader.
  45  */
  46 static unsigned
  47 brw_compute_barycentric_interp_modes(struct brw_context *brw,
  48                                      bool shade_model_flat,
  49                                      const struct gl_fragment_program *fprog)
  50 {
  51    unsigned barycentric_interp_modes = 0;
  52    int attr;
  53
  54    /* Loop through all fragment shader inputs to figure out what interpolation
  55     * modes are in use, and set the appropriate bits in
  56     * barycentric_interp_modes.
  57     */
  58    for (attr = 0; attr < VARYING_SLOT_MAX; ++attr) {
  59       enum glsl_interp_qualifier interp_qualifier =
  60          fprog->InterpQualifier[attr];
  61       bool is_centroid = fprog->IsCentroid & BITFIELD64_BIT(attr);
  62       bool is_gl_Color = attr == VARYING_SLOT_COL0 || attr == VARYING_SLOT_COL1;
  63
  64       /* Ignore unused inputs. */
  65       if (!(fprog->Base.InputsRead & BITFIELD64_BIT(attr)))
  66          continue;
  67
  68       /* Ignore WPOS and FACE, because they don't require interpolation. */
  69       if (attr == VARYING_SLOT_POS || attr == VARYING_SLOT_FACE)
  70          continue;
  71
  72       /* Determine the set (or sets) of barycentric coordinates needed to
  73        * interpolate this variable.  Note that when
  74        * brw->needs_unlit_centroid_workaround is set, centroid interpolation
  75        * uses PIXEL interpolation for unlit pixels and CENTROID interpolation
  76        * for lit pixels, so we need both sets of barycentric coordinates.
  77        */
  78       if (interp_qualifier == INTERP_QUALIFIER_NOPERSPECTIVE) {
  79          if (is_centroid) {
  80             barycentric_interp_modes |=
  81                1 << BRW_WM_NONPERSPECTIVE_CENTROID_BARYCENTRIC;
  82          }
  83          if (!is_centroid || brw->needs_unlit_centroid_workaround) {
  84             barycentric_interp_modes |=
  85                1 << BRW_WM_NONPERSPECTIVE_PIXEL_BARYCENTRIC;
  86          }
  87       } else if (interp_qualifier == INTERP_QUALIFIER_SMOOTH ||
  88                  (!(shade_model_flat && is_gl_Color) &&
  89                   interp_qualifier == INTERP_QUALIFIER_NONE)) {
  90          if (is_centroid) {
  91             barycentric_interp_modes |=
  92                1 << BRW_WM_PERSPECTIVE_CENTROID_BARYCENTRIC;
  93          }
  94          if (!is_centroid || brw->needs_unlit_centroid_workaround) {
  95             barycentric_interp_modes |=
  96                1 << BRW_WM_PERSPECTIVE_PIXEL_BARYCENTRIC;
  97          }
  98       }
  99    }
 100
 101    return barycentric_interp_modes;
 102 }
 103
 104 bool
 105 brw_wm_prog_data_compare(const void *in_a, const void *in_b,
 106                          int aux_size, const void *in_key)
 107 {
 108    const struct brw_wm_prog_data *a = in_a;
 109    const struct brw_wm_prog_data *b = in_b;
 110
 111    /* Compare all the struct up to the pointers. */
 112    if (memcmp(a, b, offsetof(struct brw_wm_prog_data, param)))
 113       return false;
 114
 115    if (memcmp(a->param, b->param, a->nr_params * sizeof(void *)))
 116       return false;
 117
 118    if (memcmp(a->pull_param, b->pull_param, a->nr_pull_params * sizeof(void *)))
 119       return false;
 120
 121    return true;
 122 }
 123
 124 void
 125 brw_wm_prog_data_free(const void *in_prog_data)
 126 {
 127    const struct brw_wm_prog_data *prog_data = in_prog_data;
 128
 129    ralloc_free((void *)prog_data->param);
 130    ralloc_free((void *)prog_data->pull_param);
 131 }
 132
 133 /**
 134  * All Mesa program -> GPU code generation goes through this function.
 135  * Depending on the instructions used (i.e. flow control instructions)
 136  * we'll use one of two code generators.
 137  */
 138 bool do_wm_prog(struct brw_context *brw,
 139                 struct gl_shader_program *prog,
 140                 struct brw_fragment_program *fp,
 141                 struct brw_wm_prog_key *key)
 142 {
 143    struct intel_context *intel = &brw->intel;
 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.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.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    struct intel_context *intel = &brw->intel;
 209    if (a != b) {
 210       perf_debug("  %s %d->%d\n", name, a, b);
 211       return true;
 212    } else {
 213       return false;
 214    }
 215 }
 216
 217 bool
 218 brw_debug_recompile_sampler_key(struct brw_context *brw,
 219                                 const struct brw_sampler_prog_key_data *old_key,
 220                                 const struct brw_sampler_prog_key_data *key)
 221 {
 222    bool found = false;
 223
 224    for (unsigned int i = 0; i < MAX_SAMPLERS; i++) {
 225       found |= key_debug(brw, "EXT_texture_swizzle or DEPTH_TEXTURE_MODE",
 226                          old_key->swizzles[i], key->swizzles[i]);
 227    }
 228    found |= key_debug(brw, "GL_CLAMP enabled on any texture unit's 1st coordinate",
 229                       old_key->gl_clamp_mask[0], key->gl_clamp_mask[0]);
 230    found |= key_debug(brw, "GL_CLAMP enabled on any texture unit's 2nd coordinate",
 231                       old_key->gl_clamp_mask[1], key->gl_clamp_mask[1]);
 232    found |= key_debug(brw, "GL_CLAMP enabled on any texture unit's 3rd coordinate",
 233                       old_key->gl_clamp_mask[2], key->gl_clamp_mask[2]);
 234    found |= key_debug(brw, "GL_MESA_ycbcr texturing\n",
 235                       old_key->yuvtex_mask, key->yuvtex_mask);
 236    found |= key_debug(brw, "GL_MESA_ycbcr UV swapping\n",
 237                       old_key->yuvtex_swap_mask, key->yuvtex_swap_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 intel_context *intel = &brw->intel;
 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                                    struct brw_sampler_prog_key_data *key)
 305 {
 306    struct intel_context *intel = intel_context(ctx);
 307
 308    for (int s = 0; s < MAX_SAMPLERS; s++) {
 309       key->swizzles[s] = SWIZZLE_NOOP;
 310
 311       if (!(prog->SamplersUsed & (1 << s)))
 312          continue;
 313
 314       int unit_id = prog->SamplerUnits[s];
 315       const struct gl_texture_unit *unit = &ctx->Texture.Unit[unit_id];
 316
 317       if (unit->_ReallyEnabled && unit->_Current->Target != GL_TEXTURE_BUFFER) {
 318          const struct gl_texture_object *t = unit->_Current;
 319          const struct gl_texture_image *img = t->Image[0][t->BaseLevel];
 320          struct gl_sampler_object *sampler = _mesa_get_samplerobj(ctx, unit_id);
 321
 322          const bool alpha_depth = t->DepthMode == GL_ALPHA &&
 323             (img->_BaseFormat == GL_DEPTH_COMPONENT ||
 324              img->_BaseFormat == GL_DEPTH_STENCIL);
 325
 326          /* Haswell handles texture swizzling as surface format overrides
 327           * (except for GL_ALPHA); all other platforms need MOVs in the shader.
 328           */
 329          if (!intel->is_haswell || alpha_depth)
 330             key->swizzles[s] = brw_get_texture_swizzle(ctx, t);
 331
 332          if (img->InternalFormat == GL_YCBCR_MESA) {
 333             key->yuvtex_mask |= 1 << s;
 334             if (img->TexFormat == MESA_FORMAT_YCBCR)
 335                 key->yuvtex_swap_mask |= 1 << s;
 336          }
 337
 338          if (sampler->MinFilter != GL_NEAREST &&
 339              sampler->MagFilter != GL_NEAREST) {
 340             if (sampler->WrapS == GL_CLAMP)
 341                key->gl_clamp_mask[0] |= 1 << s;
 342             if (sampler->WrapT == GL_CLAMP)
 343                key->gl_clamp_mask[1] |= 1 << s;
 344             if (sampler->WrapR == GL_CLAMP)
 345                key->gl_clamp_mask[2] |= 1 << s;
 346          }
 347       }
 348    }
 349 }
 350
 351 static void brw_wm_populate_key( struct brw_context *brw,
 352                                  struct brw_wm_prog_key *key )
 353 {
 354    struct gl_context *ctx = &brw->intel.ctx;
 355    struct intel_context *intel = &brw->intel;
 356    /* BRW_NEW_FRAGMENT_PROGRAM */
 357    const struct brw_fragment_program *fp =
 358       (struct brw_fragment_program *)brw->fragment_program;
 359    const struct gl_program *prog = (struct gl_program *) brw->fragment_program;
 360    GLuint lookup = 0;
 361    GLuint line_aa;
 362    bool program_uses_dfdy = fp->program.UsesDFdy;
 363
 364    memset(key, 0, sizeof(*key));
 365
 366    /* Build the index for table lookup
 367     */
 368    if (intel->gen < 6) {
 369       /* _NEW_COLOR */
 370       if (fp->program.UsesKill || ctx->Color.AlphaEnabled)
 371          lookup |= IZ_PS_KILL_ALPHATEST_BIT;
 372
 373       if (fp->program.Base.OutputsWritten & BITFIELD64_BIT(FRAG_RESULT_DEPTH))
 374          lookup |= IZ_PS_COMPUTES_DEPTH_BIT;
 375
 376       /* _NEW_DEPTH */
 377       if (ctx->Depth.Test)
 378          lookup |= IZ_DEPTH_TEST_ENABLE_BIT;
 379
 380       if (ctx->Depth.Test && ctx->Depth.Mask) /* ?? */
 381          lookup |= IZ_DEPTH_WRITE_ENABLE_BIT;
 382
 383       /* _NEW_STENCIL | _NEW_BUFFERS */
 384       if (ctx->Stencil._Enabled) {
 385          lookup |= IZ_STENCIL_TEST_ENABLE_BIT;
 386
 387          if (ctx->Stencil.WriteMask[0] ||
 388              ctx->Stencil.WriteMask[ctx->Stencil._BackFace])
 389             lookup |= IZ_STENCIL_WRITE_ENABLE_BIT;
 390       }
 391       key->iz_lookup = lookup;
 392    }
 393
 394    line_aa = AA_NEVER;
 395
 396    /* _NEW_LINE, _NEW_POLYGON, BRW_NEW_REDUCED_PRIMITIVE */
 397    if (ctx->Line.SmoothFlag) {
 398       if (brw->reduced_primitive == GL_LINES) {
 399          line_aa = AA_ALWAYS;
 400       }
 401       else if (brw->reduced_primitive == GL_TRIANGLES) {
 402          if (ctx->Polygon.FrontMode == GL_LINE) {
 403             line_aa = AA_SOMETIMES;
 404
 405             if (ctx->Polygon.BackMode == GL_LINE ||
 406                 (ctx->Polygon.CullFlag &&
 407                  ctx->Polygon.CullFaceMode == GL_BACK))
 408                line_aa = AA_ALWAYS;
 409          }
 410          else if (ctx->Polygon.BackMode == GL_LINE) {
 411             line_aa = AA_SOMETIMES;
 412
 413             if ((ctx->Polygon.CullFlag &&
 414                  ctx->Polygon.CullFaceMode == GL_FRONT))
 415                line_aa = AA_ALWAYS;
 416          }
 417       }
 418    }
 419
 420    key->line_aa = line_aa;
 421
 422    if (intel->gen < 6)
 423       key->stats_wm = brw->intel.stats_wm;
 424
 425    /* _NEW_LIGHT */
 426    key->flat_shade = (ctx->Light.ShadeModel == GL_FLAT);
 427
 428    /* _NEW_FRAG_CLAMP | _NEW_BUFFERS */
 429    key->clamp_fragment_color = ctx->Color._ClampFragmentColor;
 430
 431    /* _NEW_TEXTURE */
 432    brw_populate_sampler_prog_key_data(ctx, prog, &key->tex);
 433
 434    /* _NEW_BUFFERS */
 435    /*
 436     * Include the draw buffer origin and height so that we can calculate
 437     * fragment position values relative to the bottom left of the drawable,
 438     * from the incoming screen origin relative position we get as part of our
 439     * payload.
 440     *
 441     * This is only needed for the WM_WPOSXY opcode when the fragment program
 442     * uses the gl_FragCoord input.
 443     *
 444     * We could avoid recompiling by including this as a constant referenced by
 445     * our program, but if we were to do that it would also be nice to handle
 446     * getting that constant updated at batchbuffer submit time (when we
 447     * hold the lock and know where the buffer really is) rather than at emit
 448     * time when we don't hold the lock and are just guessing.  We could also
 449     * just avoid using this as key data if the program doesn't use
 450     * fragment.position.
 451     *
 452     * For DRI2 the origin_x/y will always be (0,0) but we still need the
 453     * drawable height in order to invert the Y axis.
 454     */
 455    if (fp->program.Base.InputsRead & VARYING_BIT_POS) {
 456       key->drawable_height = ctx->DrawBuffer->Height;
 457    }
 458
 459    if ((fp->program.Base.InputsRead & VARYING_BIT_POS) || program_uses_dfdy) {
 460       key->render_to_fbo = _mesa_is_user_fbo(ctx->DrawBuffer);
 461    }
 462
 463    /* _NEW_BUFFERS */
 464    key->nr_color_regions = ctx->DrawBuffer->_NumColorDrawBuffers;
 465
 466    /* _NEW_MULTISAMPLE, _NEW_COLOR, _NEW_BUFFERS */
 467    key->replicate_alpha = ctx->DrawBuffer->_NumColorDrawBuffers > 1 &&
 468       (ctx->Multisample.SampleAlphaToCoverage || ctx->Color.AlphaEnabled);
 469
 470    /* BRW_NEW_VUE_MAP_GEOM_OUT */
 471    if (intel->gen < 6)
 472       key->input_slots_valid = brw->vue_map_geom_out.slots_valid;
 473
 474    /* The unique fragment program ID */
 475    key->program_string_id = fp->id;
 476 }
 477
 478
 479 static void
 480 brw_upload_wm_prog(struct brw_context *brw)
 481 {
 482    struct intel_context *intel = &brw->intel;
 483    struct gl_context *ctx = &intel->ctx;
 484    struct brw_wm_prog_key key;
 485    struct brw_fragment_program *fp = (struct brw_fragment_program *)
 486       brw->fragment_program;
 487
 488    brw_wm_populate_key(brw, &key);
 489
 490    if (!brw_search_cache(&brw->cache, BRW_WM_PROG,
 491                          &key, sizeof(key),
 492                          &brw->wm.prog_offset, &brw->wm.prog_data)) {
 493       bool success = do_wm_prog(brw, ctx->Shader._CurrentFragmentProgram, fp,
 494                                 &key);
 495       (void) success;
 496       assert(success);
 497    }
 498 }
 499
 500
 501 const struct brw_tracked_state brw_wm_prog = {
 502    .dirty = {
 503       .mesa  = (_NEW_COLOR |
 504                 _NEW_DEPTH |
 505                 _NEW_STENCIL |
 506                 _NEW_POLYGON |
 507                 _NEW_LINE |
 508                 _NEW_LIGHT |
 509                 _NEW_FRAG_CLAMP |
 510                 _NEW_BUFFERS |
 511                 _NEW_TEXTURE |
 512                 _NEW_MULTISAMPLE),
 513       .brw   = (BRW_NEW_FRAGMENT_PROGRAM |
 514                 BRW_NEW_REDUCED_PRIMITIVE |
 515                 BRW_NEW_VUE_MAP_GEOM_OUT |
 516                 BRW_NEW_STATS_WM)
 517    },
 518    .emit = brw_upload_wm_prog
 519 };
 520