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 < FRAG_ATTRIB_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 == FRAG_ATTRIB_COL0 || attr == FRAG_ATTRIB_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 == FRAG_ATTRIB_WPOS || attr == FRAG_ATTRIB_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(intel, &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 intel_context *intel, const char *name, int a, int b)
 207 {
 208    if (a != b) {
 209       perf_debug("  %s %d->%d\n", name, a, b);
 210       return true;
 211    } else {
 212       return false;
 213    }
 214 }
 215
 216 bool
 217 brw_debug_recompile_sampler_key(struct intel_context *intel,
 218                                 const struct brw_sampler_prog_key_data *old_key,
 219                                 const struct brw_sampler_prog_key_data *key)
 220 {
 221    bool found = false;
 222
 223    for (unsigned int i = 0; i < MAX_SAMPLERS; i++) {
 224       found |= key_debug(intel, "EXT_texture_swizzle or DEPTH_TEXTURE_MODE",
 225                          old_key->swizzles[i], key->swizzles[i]);
 226    }
 227    found |= key_debug(intel, "GL_CLAMP enabled on any texture unit's 1st coordinate",
 228                       old_key->gl_clamp_mask[0], key->gl_clamp_mask[0]);
 229    found |= key_debug(intel, "GL_CLAMP enabled on any texture unit's 2nd coordinate",
 230                       old_key->gl_clamp_mask[1], key->gl_clamp_mask[1]);
 231    found |= key_debug(intel, "GL_CLAMP enabled on any texture unit's 3rd coordinate",
 232                       old_key->gl_clamp_mask[2], key->gl_clamp_mask[2]);
 233    found |= key_debug(intel, "GL_MESA_ycbcr texturing\n",
 234                       old_key->yuvtex_mask, key->yuvtex_mask);
 235    found |= key_debug(intel, "GL_MESA_ycbcr UV swapping\n",
 236                       old_key->yuvtex_swap_mask, key->yuvtex_swap_mask);
 237
 238    return found;
 239 }
 240
 241 void
 242 brw_wm_debug_recompile(struct brw_context *brw,
 243                        struct gl_shader_program *prog,
 244                        const struct brw_wm_prog_key *key)
 245 {
 246    struct intel_context *intel = &brw->intel;
 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(intel, "alphatest, computed depth, depth test, or "
 272                       "depth write",
 273                       old_key->iz_lookup, key->iz_lookup);
 274    found |= key_debug(intel, "depth statistics",
 275                       old_key->stats_wm, key->stats_wm);
 276    found |= key_debug(intel, "flat shading",
 277                       old_key->flat_shade, key->flat_shade);
 278    found |= key_debug(intel, "number of color buffers",
 279                       old_key->nr_color_regions, key->nr_color_regions);
 280    found |= key_debug(intel, "sample alpha to coverage",
 281                       old_key->sample_alpha_to_coverage, key->sample_alpha_to_coverage);
 282    found |= key_debug(intel, "rendering to FBO",
 283                       old_key->render_to_fbo, key->render_to_fbo);
 284    found |= key_debug(intel, "fragment color clamping",
 285                       old_key->clamp_fragment_color, key->clamp_fragment_color);
 286    found |= key_debug(intel, "line smoothing",
 287                       old_key->line_aa, key->line_aa);
 288    found |= key_debug(intel, "proj_attrib_mask",
 289                       old_key->proj_attrib_mask, key->proj_attrib_mask);
 290    found |= key_debug(intel, "renderbuffer height",
 291                       old_key->drawable_height, key->drawable_height);
 292    found |= key_debug(intel, "vertex shader outputs",
 293                       old_key->vp_outputs_written, key->vp_outputs_written);
 294
 295    found |= brw_debug_recompile_sampler_key(intel, &old_key->tex, &key->tex);
 296
 297    if (!found) {
 298       perf_debug("  Something else\n");
 299    }
 300 }
 301
 302 void
 303 brw_populate_sampler_prog_key_data(struct gl_context *ctx,
 304                                    const struct gl_program *prog,
 305                                    struct brw_sampler_prog_key_data *key)
 306 {
 307    struct intel_context *intel = intel_context(ctx);
 308
 309    for (int s = 0; s < MAX_SAMPLERS; s++) {
 310       key->swizzles[s] = SWIZZLE_NOOP;
 311
 312       if (!(prog->SamplersUsed & (1 << s)))
 313          continue;
 314
 315       int unit_id = prog->SamplerUnits[s];
 316       const struct gl_texture_unit *unit = &ctx->Texture.Unit[unit_id];
 317
 318       if (unit->_ReallyEnabled && unit->_Current->Target != GL_TEXTURE_BUFFER) {
 319          const struct gl_texture_object *t = unit->_Current;
 320          const struct gl_texture_image *img = t->Image[0][t->BaseLevel];
 321          struct gl_sampler_object *sampler = _mesa_get_samplerobj(ctx, unit_id);
 322
 323          const bool alpha_depth = t->DepthMode == GL_ALPHA &&
 324             (img->_BaseFormat == GL_DEPTH_COMPONENT ||
 325              img->_BaseFormat == GL_DEPTH_STENCIL);
 326
 327          /* Haswell handles texture swizzling as surface format overrides
 328           * (except for GL_ALPHA); all other platforms need MOVs in the shader.
 329           */
 330          if (!intel->is_haswell || alpha_depth)
 331             key->swizzles[s] = brw_get_texture_swizzle(ctx, t);
 332
 333          if (img->InternalFormat == GL_YCBCR_MESA) {
 334             key->yuvtex_mask |= 1 << s;
 335             if (img->TexFormat == MESA_FORMAT_YCBCR)
 336                 key->yuvtex_swap_mask |= 1 << s;
 337          }
 338
 339          if (sampler->MinFilter != GL_NEAREST &&
 340              sampler->MagFilter != GL_NEAREST) {
 341             if (sampler->WrapS == GL_CLAMP)
 342                key->gl_clamp_mask[0] |= 1 << s;
 343             if (sampler->WrapT == GL_CLAMP)
 344                key->gl_clamp_mask[1] |= 1 << s;
 345             if (sampler->WrapR == GL_CLAMP)
 346                key->gl_clamp_mask[2] |= 1 << s;
 347          }
 348       }
 349    }
 350 }
 351
 352 static void brw_wm_populate_key( struct brw_context *brw,
 353                                  struct brw_wm_prog_key *key )
 354 {
 355    struct gl_context *ctx = &brw->intel.ctx;
 356    struct intel_context *intel = &brw->intel;
 357    /* BRW_NEW_FRAGMENT_PROGRAM */
 358    const struct brw_fragment_program *fp =
 359       (struct brw_fragment_program *)brw->fragment_program;
 360    const struct gl_program *prog = (struct gl_program *) brw->fragment_program;
 361    GLuint lookup = 0;
 362    GLuint line_aa;
 363    bool program_uses_dfdy = fp->program.UsesDFdy;
 364
 365    memset(key, 0, sizeof(*key));
 366
 367    /* Build the index for table lookup
 368     */
 369    if (intel->gen < 6) {
 370       /* _NEW_COLOR */
 371       if (fp->program.UsesKill || ctx->Color.AlphaEnabled)
 372          lookup |= IZ_PS_KILL_ALPHATEST_BIT;
 373
 374       if (fp->program.Base.OutputsWritten & BITFIELD64_BIT(FRAG_RESULT_DEPTH))
 375          lookup |= IZ_PS_COMPUTES_DEPTH_BIT;
 376
 377       /* _NEW_DEPTH */
 378       if (ctx->Depth.Test)
 379          lookup |= IZ_DEPTH_TEST_ENABLE_BIT;
 380
 381       if (ctx->Depth.Test && ctx->Depth.Mask) /* ?? */
 382          lookup |= IZ_DEPTH_WRITE_ENABLE_BIT;
 383
 384       /* _NEW_STENCIL */
 385       if (ctx->Stencil._Enabled) {
 386          lookup |= IZ_STENCIL_TEST_ENABLE_BIT;
 387
 388          if (ctx->Stencil.WriteMask[0] ||
 389              ctx->Stencil.WriteMask[ctx->Stencil._BackFace])
 390             lookup |= IZ_STENCIL_WRITE_ENABLE_BIT;
 391       }
 392       key->iz_lookup = lookup;
 393    }
 394
 395    line_aa = AA_NEVER;
 396
 397    /* _NEW_LINE, _NEW_POLYGON, BRW_NEW_REDUCED_PRIMITIVE */
 398    if (ctx->Line.SmoothFlag) {
 399       if (brw->intel.reduced_primitive == GL_LINES) {
 400          line_aa = AA_ALWAYS;
 401       }
 402       else if (brw->intel.reduced_primitive == GL_TRIANGLES) {
 403          if (ctx->Polygon.FrontMode == GL_LINE) {
 404             line_aa = AA_SOMETIMES;
 405
 406             if (ctx->Polygon.BackMode == GL_LINE ||
 407                 (ctx->Polygon.CullFlag &&
 408                  ctx->Polygon.CullFaceMode == GL_BACK))
 409                line_aa = AA_ALWAYS;
 410          }
 411          else if (ctx->Polygon.BackMode == GL_LINE) {
 412             line_aa = AA_SOMETIMES;
 413
 414             if ((ctx->Polygon.CullFlag &&
 415                  ctx->Polygon.CullFaceMode == GL_FRONT))
 416                line_aa = AA_ALWAYS;
 417          }
 418       }
 419    }
 420
 421    key->line_aa = line_aa;
 422
 423    if (intel->gen < 6)
 424       key->stats_wm = brw->intel.stats_wm;
 425
 426    /* BRW_NEW_WM_INPUT_DIMENSIONS */
 427    /* Only set this for fixed function.  The optimization it enables isn't
 428     * useful for programs using shaders.
 429     */
 430    if (ctx->Shader.CurrentFragmentProgram)
 431       key->proj_attrib_mask = ~(GLbitfield64) 0;
 432    else
 433       key->proj_attrib_mask = brw->wm.input_size_masks[4-1];
 434
 435    /* _NEW_LIGHT */
 436    key->flat_shade = (ctx->Light.ShadeModel == GL_FLAT);
 437
 438    /* _NEW_FRAG_CLAMP | _NEW_BUFFERS */
 439    key->clamp_fragment_color = ctx->Color._ClampFragmentColor;
 440
 441    /* _NEW_TEXTURE */
 442    brw_populate_sampler_prog_key_data(ctx, prog, &key->tex);
 443
 444    /* _NEW_BUFFERS */
 445    /*
 446     * Include the draw buffer origin and height so that we can calculate
 447     * fragment position values relative to the bottom left of the drawable,
 448     * from the incoming screen origin relative position we get as part of our
 449     * payload.
 450     *
 451     * This is only needed for the WM_WPOSXY opcode when the fragment program
 452     * uses the gl_FragCoord input.
 453     *
 454     * We could avoid recompiling by including this as a constant referenced by
 455     * our program, but if we were to do that it would also be nice to handle
 456     * getting that constant updated at batchbuffer submit time (when we
 457     * hold the lock and know where the buffer really is) rather than at emit
 458     * time when we don't hold the lock and are just guessing.  We could also
 459     * just avoid using this as key data if the program doesn't use
 460     * fragment.position.
 461     *
 462     * For DRI2 the origin_x/y will always be (0,0) but we still need the
 463     * drawable height in order to invert the Y axis.
 464     */
 465    if (fp->program.Base.InputsRead & FRAG_BIT_WPOS) {
 466       key->drawable_height = ctx->DrawBuffer->Height;
 467    }
 468
 469    if ((fp->program.Base.InputsRead & FRAG_BIT_WPOS) || program_uses_dfdy) {
 470       key->render_to_fbo = _mesa_is_user_fbo(ctx->DrawBuffer);
 471    }
 472
 473    /* _NEW_BUFFERS */
 474    key->nr_color_regions = ctx->DrawBuffer->_NumColorDrawBuffers;
 475   /* _NEW_MULTISAMPLE */
 476    key->sample_alpha_to_coverage = ctx->Multisample.SampleAlphaToCoverage;
 477
 478    /* CACHE_NEW_VS_PROG */
 479    if (intel->gen < 6)
 480       key->vp_outputs_written = brw->vs.prog_data->outputs_written;
 481
 482    /* The unique fragment program ID */
 483    key->program_string_id = fp->id;
 484 }
 485
 486
 487 static void
 488 brw_upload_wm_prog(struct brw_context *brw)
 489 {
 490    struct intel_context *intel = &brw->intel;
 491    struct gl_context *ctx = &intel->ctx;
 492    struct brw_wm_prog_key key;
 493    struct brw_fragment_program *fp = (struct brw_fragment_program *)
 494       brw->fragment_program;
 495
 496    brw_wm_populate_key(brw, &key);
 497
 498    if (!brw_search_cache(&brw->cache, BRW_WM_PROG,
 499                          &key, sizeof(key),
 500                          &brw->wm.prog_offset, &brw->wm.prog_data)) {
 501       bool success = do_wm_prog(brw, ctx->Shader._CurrentFragmentProgram, fp,
 502                                 &key);
 503       (void) success;
 504       assert(success);
 505    }
 506 }
 507
 508
 509 const struct brw_tracked_state brw_wm_prog = {
 510    .dirty = {
 511       .mesa  = (_NEW_COLOR |
 512                 _NEW_DEPTH |
 513                 _NEW_STENCIL |
 514                 _NEW_POLYGON |
 515                 _NEW_LINE |
 516                 _NEW_LIGHT |
 517                 _NEW_FRAG_CLAMP |
 518                 _NEW_BUFFERS |
 519                 _NEW_TEXTURE |
 520                 _NEW_MULTISAMPLE),
 521       .brw   = (BRW_NEW_FRAGMENT_PROGRAM |
 522                 BRW_NEW_WM_INPUT_DIMENSIONS |
 523                 BRW_NEW_REDUCED_PRIMITIVE),
 524       .cache = CACHE_NEW_VS_PROG,
 525    },
 526    .emit = brw_upload_wm_prog
 527 };
 528