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->fp = fp;
 172
 173    brw_init_compile(brw, &c->func, c);
 174
 175    c->prog_data.barycentric_interp_modes =
 176       brw_compute_barycentric_interp_modes(brw, c->key.flat_shade,
 177                                            &fp->program);
 178
 179    brw_wm_fs_emit(brw, c, prog);
 180
 181    /* Scratch space is used for register spilling */
 182    if (c->last_scratch) {
 183       perf_debug("Fragment shader triggered register spilling.  "
 184                  "Try reducing the number of live scalar values to "
 185                  "improve performance.\n");
 186
 187       c->prog_data.total_scratch = brw_get_scratch_size(c->last_scratch);
 188
 189       brw_get_scratch_bo(intel, &brw->wm.scratch_bo,
 190                          c->prog_data.total_scratch * brw->max_wm_threads);
 191    }
 192
 193    if (unlikely(INTEL_DEBUG & DEBUG_WM))
 194       fprintf(stderr, "\n");
 195
 196    /* get the program
 197     */
 198    program = brw_get_program(&c->func, &program_size);
 199
 200    brw_upload_cache(&brw->cache, BRW_WM_PROG,
 201                     &c->key, sizeof(c->key),
 202                     program, program_size,
 203                     &c->prog_data, sizeof(c->prog_data),
 204                     &brw->wm.prog_offset, &brw->wm.prog_data);
 205
 206    ralloc_free(c);
 207
 208    return true;
 209 }
 210
 211 static bool
 212 key_debug(const char *name, int a, int b)
 213 {
 214    if (a != b) {
 215       perf_debug("  %s %d->%d\n", name, a, b);
 216       return true;
 217    } else {
 218       return false;
 219    }
 220 }
 221
 222 bool
 223 brw_debug_recompile_sampler_key(const struct brw_sampler_prog_key_data *old_key,
 224                                 const struct brw_sampler_prog_key_data *key)
 225 {
 226    bool found = false;
 227
 228    for (unsigned int i = 0; i < MAX_SAMPLERS; i++) {
 229       found |= key_debug("EXT_texture_swizzle or DEPTH_TEXTURE_MODE",
 230                          old_key->swizzles[i], key->swizzles[i]);
 231    }
 232    found |= key_debug("GL_CLAMP enabled on any texture unit's 1st coordinate",
 233                       old_key->gl_clamp_mask[0], key->gl_clamp_mask[0]);
 234    found |= key_debug("GL_CLAMP enabled on any texture unit's 2nd coordinate",
 235                       old_key->gl_clamp_mask[1], key->gl_clamp_mask[1]);
 236    found |= key_debug("GL_CLAMP enabled on any texture unit's 3rd coordinate",
 237                       old_key->gl_clamp_mask[2], key->gl_clamp_mask[2]);
 238    found |= key_debug("GL_MESA_ycbcr texturing\n",
 239                       old_key->yuvtex_mask, key->yuvtex_mask);
 240    found |= key_debug("GL_MESA_ycbcr UV swapping\n",
 241                       old_key->yuvtex_swap_mask, key->yuvtex_swap_mask);
 242
 243    return found;
 244 }
 245
 246 void
 247 brw_wm_debug_recompile(struct brw_context *brw,
 248                        struct gl_shader_program *prog,
 249                        const struct brw_wm_prog_key *key)
 250 {
 251    struct brw_cache_item *c = NULL;
 252    const struct brw_wm_prog_key *old_key = NULL;
 253    bool found = false;
 254
 255    perf_debug("Recompiling fragment shader for program %d\n", prog->Name);
 256
 257    for (unsigned int i = 0; i < brw->cache.size; i++) {
 258       for (c = brw->cache.items[i]; c; c = c->next) {
 259          if (c->cache_id == BRW_WM_PROG) {
 260             old_key = c->key;
 261
 262             if (old_key->program_string_id == key->program_string_id)
 263                break;
 264          }
 265       }
 266       if (c)
 267          break;
 268    }
 269
 270    if (!c) {
 271       perf_debug("  Didn't find previous compile in the shader cache for "
 272                  "debug\n");
 273       return;
 274    }
 275
 276    found |= key_debug("alphatest, computed depth, depth test, or depth write",
 277                       old_key->iz_lookup, key->iz_lookup);
 278    found |= key_debug("depth statistics", old_key->stats_wm, key->stats_wm);
 279    found |= key_debug("flat shading", old_key->flat_shade, key->flat_shade);
 280    found |= key_debug("number of color buffers", old_key->nr_color_regions, key->nr_color_regions);
 281    found |= key_debug("sample alpha to coverage", old_key->sample_alpha_to_coverage, key->sample_alpha_to_coverage);
 282    found |= key_debug("rendering to FBO", old_key->render_to_fbo, key->render_to_fbo);
 283    found |= key_debug("fragment color clamping", old_key->clamp_fragment_color, key->clamp_fragment_color);
 284    found |= key_debug("line smoothing", old_key->line_aa, key->line_aa);
 285    found |= key_debug("proj_attrib_mask", old_key->proj_attrib_mask, key->proj_attrib_mask);
 286    found |= key_debug("renderbuffer height", old_key->drawable_height, key->drawable_height);
 287    found |= key_debug("vertex shader outputs", old_key->vp_outputs_written, key->vp_outputs_written);
 288
 289    found |= brw_debug_recompile_sampler_key(&old_key->tex, &key->tex);
 290
 291    if (!found) {
 292       perf_debug("  Something else\n");
 293    }
 294 }
 295
 296 void
 297 brw_populate_sampler_prog_key_data(struct gl_context *ctx,
 298                                    const struct gl_program *prog,
 299                                    struct brw_sampler_prog_key_data *key)
 300 {
 301    struct intel_context *intel = intel_context(ctx);
 302
 303    for (int s = 0; s < MAX_SAMPLERS; s++) {
 304       key->swizzles[s] = SWIZZLE_NOOP;
 305
 306       if (!(prog->SamplersUsed & (1 << s)))
 307          continue;
 308
 309       int unit_id = prog->SamplerUnits[s];
 310       const struct gl_texture_unit *unit = &ctx->Texture.Unit[unit_id];
 311
 312       if (unit->_ReallyEnabled && 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 (!intel->is_haswell || alpha_depth)
 325             key->swizzles[s] = brw_get_texture_swizzle(t);
 326
 327          if (img->InternalFormat == GL_YCBCR_MESA) {
 328             key->yuvtex_mask |= 1 << s;
 329             if (img->TexFormat == MESA_FORMAT_YCBCR)
 330                 key->yuvtex_swap_mask |= 1 << s;
 331          }
 332
 333          if (sampler->MinFilter != GL_NEAREST &&
 334              sampler->MagFilter != GL_NEAREST) {
 335             if (sampler->WrapS == GL_CLAMP)
 336                key->gl_clamp_mask[0] |= 1 << s;
 337             if (sampler->WrapT == GL_CLAMP)
 338                key->gl_clamp_mask[1] |= 1 << s;
 339             if (sampler->WrapR == GL_CLAMP)
 340                key->gl_clamp_mask[2] |= 1 << s;
 341          }
 342       }
 343    }
 344 }
 345
 346 static void brw_wm_populate_key( struct brw_context *brw,
 347                                  struct brw_wm_prog_key *key )
 348 {
 349    struct gl_context *ctx = &brw->intel.ctx;
 350    struct intel_context *intel = &brw->intel;
 351    /* BRW_NEW_FRAGMENT_PROGRAM */
 352    const struct brw_fragment_program *fp =
 353       (struct brw_fragment_program *)brw->fragment_program;
 354    const struct gl_program *prog = (struct gl_program *) brw->fragment_program;
 355    GLuint lookup = 0;
 356    GLuint line_aa;
 357    bool program_uses_dfdy = fp->program.UsesDFdy;
 358
 359    memset(key, 0, sizeof(*key));
 360
 361    /* Build the index for table lookup
 362     */
 363    if (intel->gen < 6) {
 364       /* _NEW_COLOR */
 365       if (fp->program.UsesKill || ctx->Color.AlphaEnabled)
 366          lookup |= IZ_PS_KILL_ALPHATEST_BIT;
 367
 368       if (fp->program.Base.OutputsWritten & BITFIELD64_BIT(FRAG_RESULT_DEPTH))
 369          lookup |= IZ_PS_COMPUTES_DEPTH_BIT;
 370
 371       /* _NEW_DEPTH */
 372       if (ctx->Depth.Test)
 373          lookup |= IZ_DEPTH_TEST_ENABLE_BIT;
 374
 375       if (ctx->Depth.Test && ctx->Depth.Mask) /* ?? */
 376          lookup |= IZ_DEPTH_WRITE_ENABLE_BIT;
 377
 378       /* _NEW_STENCIL */
 379       if (ctx->Stencil._Enabled) {
 380          lookup |= IZ_STENCIL_TEST_ENABLE_BIT;
 381
 382          if (ctx->Stencil.WriteMask[0] ||
 383              ctx->Stencil.WriteMask[ctx->Stencil._BackFace])
 384             lookup |= IZ_STENCIL_WRITE_ENABLE_BIT;
 385       }
 386       key->iz_lookup = lookup;
 387    }
 388
 389    line_aa = AA_NEVER;
 390
 391    /* _NEW_LINE, _NEW_POLYGON, BRW_NEW_REDUCED_PRIMITIVE */
 392    if (ctx->Line.SmoothFlag) {
 393       if (brw->intel.reduced_primitive == GL_LINES) {
 394          line_aa = AA_ALWAYS;
 395       }
 396       else if (brw->intel.reduced_primitive == GL_TRIANGLES) {
 397          if (ctx->Polygon.FrontMode == GL_LINE) {
 398             line_aa = AA_SOMETIMES;
 399
 400             if (ctx->Polygon.BackMode == GL_LINE ||
 401                 (ctx->Polygon.CullFlag &&
 402                  ctx->Polygon.CullFaceMode == GL_BACK))
 403                line_aa = AA_ALWAYS;
 404          }
 405          else if (ctx->Polygon.BackMode == GL_LINE) {
 406             line_aa = AA_SOMETIMES;
 407
 408             if ((ctx->Polygon.CullFlag &&
 409                  ctx->Polygon.CullFaceMode == GL_FRONT))
 410                line_aa = AA_ALWAYS;
 411          }
 412       }
 413    }
 414
 415    key->line_aa = line_aa;
 416
 417    if (intel->gen < 6)
 418       key->stats_wm = brw->intel.stats_wm;
 419
 420    /* BRW_NEW_WM_INPUT_DIMENSIONS */
 421    /* Only set this for fixed function.  The optimization it enables isn't
 422     * useful for programs using shaders.
 423     */
 424    if (ctx->Shader.CurrentFragmentProgram)
 425       key->proj_attrib_mask = 0xffffffff;
 426    else
 427       key->proj_attrib_mask = brw->wm.input_size_masks[4-1];
 428
 429    /* _NEW_LIGHT */
 430    key->flat_shade = (ctx->Light.ShadeModel == GL_FLAT);
 431
 432    /* _NEW_FRAG_CLAMP | _NEW_BUFFERS */
 433    key->clamp_fragment_color = ctx->Color._ClampFragmentColor;
 434
 435    /* _NEW_TEXTURE */
 436    brw_populate_sampler_prog_key_data(ctx, prog, &key->tex);
 437
 438    /* _NEW_BUFFERS */
 439    /*
 440     * Include the draw buffer origin and height so that we can calculate
 441     * fragment position values relative to the bottom left of the drawable,
 442     * from the incoming screen origin relative position we get as part of our
 443     * payload.
 444     *
 445     * This is only needed for the WM_WPOSXY opcode when the fragment program
 446     * uses the gl_FragCoord input.
 447     *
 448     * We could avoid recompiling by including this as a constant referenced by
 449     * our program, but if we were to do that it would also be nice to handle
 450     * getting that constant updated at batchbuffer submit time (when we
 451     * hold the lock and know where the buffer really is) rather than at emit
 452     * time when we don't hold the lock and are just guessing.  We could also
 453     * just avoid using this as key data if the program doesn't use
 454     * fragment.position.
 455     *
 456     * For DRI2 the origin_x/y will always be (0,0) but we still need the
 457     * drawable height in order to invert the Y axis.
 458     */
 459    if (fp->program.Base.InputsRead & FRAG_BIT_WPOS) {
 460       key->drawable_height = ctx->DrawBuffer->Height;
 461    }
 462
 463    if ((fp->program.Base.InputsRead & FRAG_BIT_WPOS) || program_uses_dfdy) {
 464       key->render_to_fbo = _mesa_is_user_fbo(ctx->DrawBuffer);
 465    }
 466
 467    /* _NEW_BUFFERS */
 468    key->nr_color_regions = ctx->DrawBuffer->_NumColorDrawBuffers;
 469   /* _NEW_MULTISAMPLE */
 470    key->sample_alpha_to_coverage = ctx->Multisample.SampleAlphaToCoverage;
 471
 472    /* CACHE_NEW_VS_PROG */
 473    if (intel->gen < 6)
 474       key->vp_outputs_written = brw->vs.prog_data->outputs_written;
 475
 476    /* The unique fragment program ID */
 477    key->program_string_id = fp->id;
 478 }
 479
 480
 481 static void
 482 brw_upload_wm_prog(struct brw_context *brw)
 483 {
 484    struct intel_context *intel = &brw->intel;
 485    struct gl_context *ctx = &intel->ctx;
 486    struct brw_wm_prog_key key;
 487    struct brw_fragment_program *fp = (struct brw_fragment_program *)
 488       brw->fragment_program;
 489
 490    brw_wm_populate_key(brw, &key);
 491
 492    if (!brw_search_cache(&brw->cache, BRW_WM_PROG,
 493                          &key, sizeof(key),
 494                          &brw->wm.prog_offset, &brw->wm.prog_data)) {
 495       bool success = do_wm_prog(brw, ctx->Shader._CurrentFragmentProgram, fp,
 496                                 &key);
 497       (void) success;
 498       assert(success);
 499    }
 500 }
 501
 502
 503 const struct brw_tracked_state brw_wm_prog = {
 504    .dirty = {
 505       .mesa  = (_NEW_COLOR |
 506                 _NEW_DEPTH |
 507                 _NEW_STENCIL |
 508                 _NEW_POLYGON |
 509                 _NEW_LINE |
 510                 _NEW_LIGHT |
 511                 _NEW_FRAG_CLAMP |
 512                 _NEW_BUFFERS |
 513                 _NEW_TEXTURE |
 514                 _NEW_MULTISAMPLE),
 515       .brw   = (BRW_NEW_FRAGMENT_PROGRAM |
 516                 BRW_NEW_WM_INPUT_DIMENSIONS |
 517                 BRW_NEW_REDUCED_PRIMITIVE),
 518       .cache = CACHE_NEW_VS_PROG,
 519    },
 520    .emit = brw_upload_wm_prog
 521 };
 522