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 brw_wm_compile *c;
 144    const GLuint *program;
 145    struct gl_shader *fs = NULL;
 146    GLuint program_size;
 147
 148    if (prog)
 149       fs = prog->_LinkedShaders[MESA_SHADER_FRAGMENT];
 150
 151    c = rzalloc(NULL, struct brw_wm_compile);
 152
 153    /* Allocate the references to the uniforms that will end up in the
 154     * prog_data associated with the compiled program, and which will be freed
 155     * by the state cache.
 156     */
 157    int param_count;
 158    if (fs) {
 159       param_count = fs->num_uniform_components;
 160    } else {
 161       param_count = fp->program.Base.Parameters->NumParameters * 4;
 162    }
 163    /* The backend also sometimes adds params for texture size. */
 164    param_count += 2 * BRW_MAX_TEX_UNIT;
 165    c->prog_data.param = rzalloc_array(NULL, const float *, param_count);
 166    c->prog_data.pull_param = rzalloc_array(NULL, const float *, param_count);
 167
 168    memcpy(&c->key, key, sizeof(*key));
 169
 170    c->prog_data.barycentric_interp_modes =
 171       brw_compute_barycentric_interp_modes(brw, c->key.flat_shade,
 172                                            &fp->program);
 173
 174    program = brw_wm_fs_emit(brw, c, &fp->program, prog, &program_size);
 175    if (program == NULL)
 176       return false;
 177
 178    /* Scratch space is used for register spilling */
 179    if (c->last_scratch) {
 180       perf_debug("Fragment shader triggered register spilling.  "
 181                  "Try reducing the number of live scalar values to "
 182                  "improve performance.\n");
 183
 184       c->prog_data.total_scratch = brw_get_scratch_size(c->last_scratch);
 185
 186       brw_get_scratch_bo(brw, &brw->wm.scratch_bo,
 187                          c->prog_data.total_scratch * brw->max_wm_threads);
 188    }
 189
 190    if (unlikely(INTEL_DEBUG & DEBUG_WM))
 191       fprintf(stderr, "\n");
 192
 193    brw_upload_cache(&brw->cache, BRW_WM_PROG,
 194                     &c->key, sizeof(c->key),
 195                     program, program_size,
 196                     &c->prog_data, sizeof(c->prog_data),
 197                     &brw->wm.prog_offset, &brw->wm.prog_data);
 198
 199    ralloc_free(c);
 200
 201    return true;
 202 }
 203
 204 static bool
 205 key_debug(struct brw_context *brw, const char *name, int a, int b)
 206 {
 207    if (a != b) {
 208       perf_debug("  %s %d->%d\n", name, a, b);
 209       return true;
 210    } else {
 211       return false;
 212    }
 213 }
 214
 215 bool
 216 brw_debug_recompile_sampler_key(struct brw_context *brw,
 217                                 const struct brw_sampler_prog_key_data *old_key,
 218                                 const struct brw_sampler_prog_key_data *key)
 219 {
 220    bool found = false;
 221
 222    for (unsigned int i = 0; i < MAX_SAMPLERS; i++) {
 223       found |= key_debug(brw, "EXT_texture_swizzle or DEPTH_TEXTURE_MODE",
 224                          old_key->swizzles[i], key->swizzles[i]);
 225    }
 226    found |= key_debug(brw, "GL_CLAMP enabled on any texture unit's 1st coordinate",
 227                       old_key->gl_clamp_mask[0], key->gl_clamp_mask[0]);
 228    found |= key_debug(brw, "GL_CLAMP enabled on any texture unit's 2nd coordinate",
 229                       old_key->gl_clamp_mask[1], key->gl_clamp_mask[1]);
 230    found |= key_debug(brw, "GL_CLAMP enabled on any texture unit's 3rd coordinate",
 231                       old_key->gl_clamp_mask[2], key->gl_clamp_mask[2]);
 232    found |= key_debug(brw, "GL_MESA_ycbcr texturing\n",
 233                       old_key->yuvtex_mask, key->yuvtex_mask);
 234    found |= key_debug(brw, "GL_MESA_ycbcr UV swapping\n",
 235                       old_key->yuvtex_swap_mask, key->yuvtex_swap_mask);
 236
 237    return found;
 238 }
 239
 240 void
 241 brw_wm_debug_recompile(struct brw_context *brw,
 242                        struct gl_shader_program *prog,
 243                        const struct brw_wm_prog_key *key)
 244 {
 245    struct brw_cache_item *c = NULL;
 246    const struct brw_wm_prog_key *old_key = NULL;
 247    bool found = false;
 248
 249    perf_debug("Recompiling fragment shader for program %d\n", prog->Name);
 250
 251    for (unsigned int i = 0; i < brw->cache.size; i++) {
 252       for (c = brw->cache.items[i]; c; c = c->next) {
 253          if (c->cache_id == BRW_WM_PROG) {
 254             old_key = c->key;
 255
 256             if (old_key->program_string_id == key->program_string_id)
 257                break;
 258          }
 259       }
 260       if (c)
 261          break;
 262    }
 263
 264    if (!c) {
 265       perf_debug("  Didn't find previous compile in the shader cache for debug\n");
 266       return;
 267    }
 268
 269    found |= key_debug(brw, "alphatest, computed depth, depth test, or "
 270                       "depth write",
 271                       old_key->iz_lookup, key->iz_lookup);
 272    found |= key_debug(brw, "depth statistics",
 273                       old_key->stats_wm, key->stats_wm);
 274    found |= key_debug(brw, "flat shading",
 275                       old_key->flat_shade, key->flat_shade);
 276    found |= key_debug(brw, "number of color buffers",
 277                       old_key->nr_color_regions, key->nr_color_regions);
 278    found |= key_debug(brw, "MRT alpha test or alpha-to-coverage",
 279                       old_key->replicate_alpha, key->replicate_alpha);
 280    found |= key_debug(brw, "rendering to FBO",
 281                       old_key->render_to_fbo, key->render_to_fbo);
 282    found |= key_debug(brw, "fragment color clamping",
 283                       old_key->clamp_fragment_color, key->clamp_fragment_color);
 284    found |= key_debug(brw, "line smoothing",
 285                       old_key->line_aa, key->line_aa);
 286    found |= key_debug(brw, "renderbuffer height",
 287                       old_key->drawable_height, key->drawable_height);
 288    found |= key_debug(brw, "input slots valid",
 289                       old_key->input_slots_valid, key->input_slots_valid);
 290
 291    found |= brw_debug_recompile_sampler_key(brw, &old_key->tex, &key->tex);
 292
 293    if (!found) {
 294       perf_debug("  Something else\n");
 295    }
 296 }
 297
 298 void
 299 brw_populate_sampler_prog_key_data(struct gl_context *ctx,
 300                                    const struct gl_program *prog,
 301                                    struct brw_sampler_prog_key_data *key)
 302 {
 303    struct brw_context *brw = brw_context(ctx);
 304
 305    for (int s = 0; s < MAX_SAMPLERS; s++) {
 306       key->swizzles[s] = SWIZZLE_NOOP;
 307
 308       if (!(prog->SamplersUsed & (1 << s)))
 309          continue;
 310
 311       int unit_id = prog->SamplerUnits[s];
 312       const struct gl_texture_unit *unit = &ctx->Texture.Unit[unit_id];
 313
 314       if (unit->_ReallyEnabled && unit->_Current->Target != GL_TEXTURE_BUFFER) {
 315          const struct gl_texture_object *t = unit->_Current;
 316          const struct gl_texture_image *img = t->Image[0][t->BaseLevel];
 317          struct gl_sampler_object *sampler = _mesa_get_samplerobj(ctx, unit_id);
 318
 319          const bool alpha_depth = t->DepthMode == GL_ALPHA &&
 320             (img->_BaseFormat == GL_DEPTH_COMPONENT ||
 321              img->_BaseFormat == GL_DEPTH_STENCIL);
 322
 323          /* Haswell handles texture swizzling as surface format overrides
 324           * (except for GL_ALPHA); all other platforms need MOVs in the shader.
 325           */
 326          if (!brw->is_haswell || alpha_depth)
 327             key->swizzles[s] = brw_get_texture_swizzle(ctx, t);
 328
 329          if (img->InternalFormat == GL_YCBCR_MESA) {
 330             key->yuvtex_mask |= 1 << s;
 331             if (img->TexFormat == MESA_FORMAT_YCBCR)
 332                 key->yuvtex_swap_mask |= 1 << s;
 333          }
 334
 335          if (sampler->MinFilter != GL_NEAREST &&
 336              sampler->MagFilter != GL_NEAREST) {
 337             if (sampler->WrapS == GL_CLAMP)
 338                key->gl_clamp_mask[0] |= 1 << s;
 339             if (sampler->WrapT == GL_CLAMP)
 340                key->gl_clamp_mask[1] |= 1 << s;
 341             if (sampler->WrapR == GL_CLAMP)
 342                key->gl_clamp_mask[2] |= 1 << s;
 343          }
 344       }
 345    }
 346 }
 347
 348 static void brw_wm_populate_key( struct brw_context *brw,
 349                                  struct brw_wm_prog_key *key )
 350 {
 351    struct gl_context *ctx = &brw->intel.ctx;
 352    struct intel_context *intel = &brw->intel;
 353    /* BRW_NEW_FRAGMENT_PROGRAM */
 354    const struct brw_fragment_program *fp =
 355       (struct brw_fragment_program *)brw->fragment_program;
 356    const struct gl_program *prog = (struct gl_program *) brw->fragment_program;
 357    GLuint lookup = 0;
 358    GLuint line_aa;
 359    bool program_uses_dfdy = fp->program.UsesDFdy;
 360
 361    memset(key, 0, sizeof(*key));
 362
 363    /* Build the index for table lookup
 364     */
 365    if (intel->gen < 6) {
 366       /* _NEW_COLOR */
 367       if (fp->program.UsesKill || ctx->Color.AlphaEnabled)
 368          lookup |= IZ_PS_KILL_ALPHATEST_BIT;
 369
 370       if (fp->program.Base.OutputsWritten & BITFIELD64_BIT(FRAG_RESULT_DEPTH))
 371          lookup |= IZ_PS_COMPUTES_DEPTH_BIT;
 372
 373       /* _NEW_DEPTH */
 374       if (ctx->Depth.Test)
 375          lookup |= IZ_DEPTH_TEST_ENABLE_BIT;
 376
 377       if (ctx->Depth.Test && ctx->Depth.Mask) /* ?? */
 378          lookup |= IZ_DEPTH_WRITE_ENABLE_BIT;
 379
 380       /* _NEW_STENCIL | _NEW_BUFFERS */
 381       if (ctx->Stencil._Enabled) {
 382          lookup |= IZ_STENCIL_TEST_ENABLE_BIT;
 383
 384          if (ctx->Stencil.WriteMask[0] ||
 385              ctx->Stencil.WriteMask[ctx->Stencil._BackFace])
 386             lookup |= IZ_STENCIL_WRITE_ENABLE_BIT;
 387       }
 388       key->iz_lookup = lookup;
 389    }
 390
 391    line_aa = AA_NEVER;
 392
 393    /* _NEW_LINE, _NEW_POLYGON, BRW_NEW_REDUCED_PRIMITIVE */
 394    if (ctx->Line.SmoothFlag) {
 395       if (brw->reduced_primitive == GL_LINES) {
 396          line_aa = AA_ALWAYS;
 397       }
 398       else if (brw->reduced_primitive == GL_TRIANGLES) {
 399          if (ctx->Polygon.FrontMode == GL_LINE) {
 400             line_aa = AA_SOMETIMES;
 401
 402             if (ctx->Polygon.BackMode == GL_LINE ||
 403                 (ctx->Polygon.CullFlag &&
 404                  ctx->Polygon.CullFaceMode == GL_BACK))
 405                line_aa = AA_ALWAYS;
 406          }
 407          else if (ctx->Polygon.BackMode == GL_LINE) {
 408             line_aa = AA_SOMETIMES;
 409
 410             if ((ctx->Polygon.CullFlag &&
 411                  ctx->Polygon.CullFaceMode == GL_FRONT))
 412                line_aa = AA_ALWAYS;
 413          }
 414       }
 415    }
 416
 417    key->line_aa = line_aa;
 418
 419    if (intel->gen < 6)
 420       key->stats_wm = brw->stats_wm;
 421
 422    /* _NEW_LIGHT */
 423    key->flat_shade = (ctx->Light.ShadeModel == GL_FLAT);
 424
 425    /* _NEW_FRAG_CLAMP | _NEW_BUFFERS */
 426    key->clamp_fragment_color = ctx->Color._ClampFragmentColor;
 427
 428    /* _NEW_TEXTURE */
 429    brw_populate_sampler_prog_key_data(ctx, prog, &key->tex);
 430
 431    /* _NEW_BUFFERS */
 432    /*
 433     * Include the draw buffer origin and height so that we can calculate
 434     * fragment position values relative to the bottom left of the drawable,
 435     * from the incoming screen origin relative position we get as part of our
 436     * payload.
 437     *
 438     * This is only needed for the WM_WPOSXY opcode when the fragment program
 439     * uses the gl_FragCoord input.
 440     *
 441     * We could avoid recompiling by including this as a constant referenced by
 442     * our program, but if we were to do that it would also be nice to handle
 443     * getting that constant updated at batchbuffer submit time (when we
 444     * hold the lock and know where the buffer really is) rather than at emit
 445     * time when we don't hold the lock and are just guessing.  We could also
 446     * just avoid using this as key data if the program doesn't use
 447     * fragment.position.
 448     *
 449     * For DRI2 the origin_x/y will always be (0,0) but we still need the
 450     * drawable height in order to invert the Y axis.
 451     */
 452    if (fp->program.Base.InputsRead & VARYING_BIT_POS) {
 453       key->drawable_height = ctx->DrawBuffer->Height;
 454    }
 455
 456    if ((fp->program.Base.InputsRead & VARYING_BIT_POS) || program_uses_dfdy) {
 457       key->render_to_fbo = _mesa_is_user_fbo(ctx->DrawBuffer);
 458    }
 459
 460    /* _NEW_BUFFERS */
 461    key->nr_color_regions = ctx->DrawBuffer->_NumColorDrawBuffers;
 462
 463    /* _NEW_MULTISAMPLE, _NEW_COLOR, _NEW_BUFFERS */
 464    key->replicate_alpha = ctx->DrawBuffer->_NumColorDrawBuffers > 1 &&
 465       (ctx->Multisample.SampleAlphaToCoverage || ctx->Color.AlphaEnabled);
 466
 467    /* BRW_NEW_VUE_MAP_GEOM_OUT */
 468    if (intel->gen < 6)
 469       key->input_slots_valid = brw->vue_map_geom_out.slots_valid;
 470
 471    /* The unique fragment program ID */
 472    key->program_string_id = fp->id;
 473 }
 474
 475
 476 static void
 477 brw_upload_wm_prog(struct brw_context *brw)
 478 {
 479    struct intel_context *intel = &brw->intel;
 480    struct gl_context *ctx = &intel->ctx;
 481    struct brw_wm_prog_key key;
 482    struct brw_fragment_program *fp = (struct brw_fragment_program *)
 483       brw->fragment_program;
 484
 485    brw_wm_populate_key(brw, &key);
 486
 487    if (!brw_search_cache(&brw->cache, BRW_WM_PROG,
 488                          &key, sizeof(key),
 489                          &brw->wm.prog_offset, &brw->wm.prog_data)) {
 490       bool success = do_wm_prog(brw, ctx->Shader._CurrentFragmentProgram, fp,
 491                                 &key);
 492       (void) success;
 493       assert(success);
 494    }
 495 }
 496
 497
 498 const struct brw_tracked_state brw_wm_prog = {
 499    .dirty = {
 500       .mesa  = (_NEW_COLOR |
 501                 _NEW_DEPTH |
 502                 _NEW_STENCIL |
 503                 _NEW_POLYGON |
 504                 _NEW_LINE |
 505                 _NEW_LIGHT |
 506                 _NEW_FRAG_CLAMP |
 507                 _NEW_BUFFERS |
 508                 _NEW_TEXTURE |
 509                 _NEW_MULTISAMPLE),
 510       .brw   = (BRW_NEW_FRAGMENT_PROGRAM |
 511                 BRW_NEW_REDUCED_PRIMITIVE |
 512                 BRW_NEW_VUE_MAP_GEOM_OUT |
 513                 BRW_NEW_STATS_WM)
 514    },
 515    .emit = brw_upload_wm_prog
 516 };
 517