src/mesa/drivers/dri/i965/brw_wm_sampler_state.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
  33 #include "brw_context.h"
  34 #include "brw_state.h"
  35 #include "brw_defines.h"
  36 #include "intel_mipmap_tree.h"
  37
  38 #include "main/macros.h"
  39 #include "main/samplerobj.h"
  40
  41
  42 /* Samplers aren't strictly wm state from the hardware's perspective,
  43  * but that is the only situation in which we use them in this driver.
  44  */
  45
  46
  47
  48 uint32_t
  49 translate_wrap_mode(GLenum wrap, bool using_nearest)
  50 {
  51    switch( wrap ) {
  52    case GL_REPEAT:
  53       return BRW_TEXCOORDMODE_WRAP;
  54    case GL_CLAMP:
  55       /* GL_CLAMP is the weird mode where coordinates are clamped to
  56        * [0.0, 1.0], so linear filtering of coordinates outside of
  57        * [0.0, 1.0] give you half edge texel value and half border
  58        * color.  The fragment shader will clamp the coordinates, and
  59        * we set clamp_border here, which gets the result desired.  We
  60        * just use clamp(_to_edge) for nearest, because for nearest
  61        * clamping to 1.0 gives border color instead of the desired
  62        * edge texels.
  63        */
  64       if (using_nearest)
  65          return BRW_TEXCOORDMODE_CLAMP;
  66       else
  67          return BRW_TEXCOORDMODE_CLAMP_BORDER;
  68    case GL_CLAMP_TO_EDGE:
  69       return BRW_TEXCOORDMODE_CLAMP;
  70    case GL_CLAMP_TO_BORDER:
  71       return BRW_TEXCOORDMODE_CLAMP_BORDER;
  72    case GL_MIRRORED_REPEAT:
  73       return BRW_TEXCOORDMODE_MIRROR;
  74    default:
  75       return BRW_TEXCOORDMODE_WRAP;
  76    }
  77 }
  78
  79 /**
  80  * Upload SAMPLER_BORDER_COLOR_STATE.
  81  */
  82 void
  83 upload_default_color(struct brw_context *brw,
  84                      struct gl_sampler_object *sampler,
  85                      int unit,
  86                      uint32_t *sdc_offset)
  87 {
  88    struct gl_context *ctx = &brw->ctx;
  89    struct gl_texture_unit *texUnit = &ctx->Texture.Unit[unit];
  90    struct gl_texture_object *texObj = texUnit->_Current;
  91    struct gl_texture_image *firstImage = texObj->Image[0][texObj->BaseLevel];
  92    float color[4];
  93
  94    switch (firstImage->_BaseFormat) {
  95    case GL_DEPTH_COMPONENT:
  96       /* GL specs that border color for depth textures is taken from the
  97        * R channel, while the hardware uses A.  Spam R into all the
  98        * channels for safety.
  99        */
 100       color[0] = sampler->BorderColor.f[0];
 101       color[1] = sampler->BorderColor.f[0];
 102       color[2] = sampler->BorderColor.f[0];
 103       color[3] = sampler->BorderColor.f[0];
 104       break;
 105    case GL_ALPHA:
 106       color[0] = 0.0;
 107       color[1] = 0.0;
 108       color[2] = 0.0;
 109       color[3] = sampler->BorderColor.f[3];
 110       break;
 111    case GL_INTENSITY:
 112       color[0] = sampler->BorderColor.f[0];
 113       color[1] = sampler->BorderColor.f[0];
 114       color[2] = sampler->BorderColor.f[0];
 115       color[3] = sampler->BorderColor.f[0];
 116       break;
 117    case GL_LUMINANCE:
 118       color[0] = sampler->BorderColor.f[0];
 119       color[1] = sampler->BorderColor.f[0];
 120       color[2] = sampler->BorderColor.f[0];
 121       color[3] = 1.0;
 122       break;
 123    case GL_LUMINANCE_ALPHA:
 124       color[0] = sampler->BorderColor.f[0];
 125       color[1] = sampler->BorderColor.f[0];
 126       color[2] = sampler->BorderColor.f[0];
 127       color[3] = sampler->BorderColor.f[3];
 128       break;
 129    default:
 130       color[0] = sampler->BorderColor.f[0];
 131       color[1] = sampler->BorderColor.f[1];
 132       color[2] = sampler->BorderColor.f[2];
 133       color[3] = sampler->BorderColor.f[3];
 134       break;
 135    }
 136
 137    /* In some cases we use an RGBA surface format for GL RGB textures,
 138     * where we've initialized the A channel to 1.0.  We also have to set
 139     * the border color alpha to 1.0 in that case.
 140     */
 141    if (firstImage->_BaseFormat == GL_RGB)
 142       color[3] = 1.0;
 143
 144    if (brw->gen == 5 || brw->gen == 6) {
 145       struct gen5_sampler_default_color *sdc;
 146
 147       sdc = brw_state_batch(brw, AUB_TRACE_SAMPLER_DEFAULT_COLOR,
 148                             sizeof(*sdc), 32, sdc_offset);
 149
 150       memset(sdc, 0, sizeof(*sdc));
 151
 152       UNCLAMPED_FLOAT_TO_UBYTE(sdc->ub[0], color[0]);
 153       UNCLAMPED_FLOAT_TO_UBYTE(sdc->ub[1], color[1]);
 154       UNCLAMPED_FLOAT_TO_UBYTE(sdc->ub[2], color[2]);
 155       UNCLAMPED_FLOAT_TO_UBYTE(sdc->ub[3], color[3]);
 156
 157       UNCLAMPED_FLOAT_TO_USHORT(sdc->us[0], color[0]);
 158       UNCLAMPED_FLOAT_TO_USHORT(sdc->us[1], color[1]);
 159       UNCLAMPED_FLOAT_TO_USHORT(sdc->us[2], color[2]);
 160       UNCLAMPED_FLOAT_TO_USHORT(sdc->us[3], color[3]);
 161
 162       UNCLAMPED_FLOAT_TO_SHORT(sdc->s[0], color[0]);
 163       UNCLAMPED_FLOAT_TO_SHORT(sdc->s[1], color[1]);
 164       UNCLAMPED_FLOAT_TO_SHORT(sdc->s[2], color[2]);
 165       UNCLAMPED_FLOAT_TO_SHORT(sdc->s[3], color[3]);
 166
 167       sdc->hf[0] = _mesa_float_to_half(color[0]);
 168       sdc->hf[1] = _mesa_float_to_half(color[1]);
 169       sdc->hf[2] = _mesa_float_to_half(color[2]);
 170       sdc->hf[3] = _mesa_float_to_half(color[3]);
 171
 172       sdc->b[0] = sdc->s[0] >> 8;
 173       sdc->b[1] = sdc->s[1] >> 8;
 174       sdc->b[2] = sdc->s[2] >> 8;
 175       sdc->b[3] = sdc->s[3] >> 8;
 176
 177       sdc->f[0] = color[0];
 178       sdc->f[1] = color[1];
 179       sdc->f[2] = color[2];
 180       sdc->f[3] = color[3];
 181    } else {
 182       struct brw_sampler_default_color *sdc;
 183
 184       sdc = brw_state_batch(brw, AUB_TRACE_SAMPLER_DEFAULT_COLOR,
 185                             sizeof(*sdc), 32, sdc_offset);
 186
 187       COPY_4V(sdc->color, color);
 188    }
 189 }
 190
 191 /**
 192  * Sets the sampler state for a single unit based off of the sampler key
 193  * entry.
 194  */
 195 static void brw_update_sampler_state(struct brw_context *brw,
 196                                      int unit,
 197                                      int ss_index,
 198                                      struct brw_sampler_state *sampler,
 199                                      uint32_t sampler_state_table_offset,
 200                                      uint32_t *sdc_offset)
 201 {
 202    struct gl_context *ctx = &brw->ctx;
 203    struct gl_texture_unit *texUnit = &ctx->Texture.Unit[unit];
 204    struct gl_texture_object *texObj = texUnit->_Current;
 205    struct intel_texture_image *intel_image =
 206       intel_texture_image(texObj->Image[0][texObj->BaseLevel]);
 207    struct gl_sampler_object *gl_sampler = _mesa_get_samplerobj(ctx, unit);
 208    bool using_nearest = false;
 209
 210    /* These don't use samplers at all. */
 211    if (texObj->Target == GL_TEXTURE_BUFFER)
 212       return;
 213
 214    switch (gl_sampler->MinFilter) {
 215    case GL_NEAREST:
 216       sampler->ss0.min_filter = BRW_MAPFILTER_NEAREST;
 217       sampler->ss0.mip_filter = BRW_MIPFILTER_NONE;
 218       using_nearest = true;
 219       break;
 220    case GL_LINEAR:
 221       sampler->ss0.min_filter = BRW_MAPFILTER_LINEAR;
 222       sampler->ss0.mip_filter = BRW_MIPFILTER_NONE;
 223       break;
 224    case GL_NEAREST_MIPMAP_NEAREST:
 225       sampler->ss0.min_filter = BRW_MAPFILTER_NEAREST;
 226       sampler->ss0.mip_filter = BRW_MIPFILTER_NEAREST;
 227       break;
 228    case GL_LINEAR_MIPMAP_NEAREST:
 229       sampler->ss0.min_filter = BRW_MAPFILTER_LINEAR;
 230       sampler->ss0.mip_filter = BRW_MIPFILTER_NEAREST;
 231       break;
 232    case GL_NEAREST_MIPMAP_LINEAR:
 233       sampler->ss0.min_filter = BRW_MAPFILTER_NEAREST;
 234       sampler->ss0.mip_filter = BRW_MIPFILTER_LINEAR;
 235       break;
 236    case GL_LINEAR_MIPMAP_LINEAR:
 237       sampler->ss0.min_filter = BRW_MAPFILTER_LINEAR;
 238       sampler->ss0.mip_filter = BRW_MIPFILTER_LINEAR;
 239       break;
 240    default:
 241       break;
 242    }
 243
 244    /* Set Anisotropy:
 245     */
 246    if (gl_sampler->MaxAnisotropy > 1.0) {
 247       sampler->ss0.min_filter = BRW_MAPFILTER_ANISOTROPIC;
 248       sampler->ss0.mag_filter = BRW_MAPFILTER_ANISOTROPIC;
 249
 250       if (gl_sampler->MaxAnisotropy > 2.0) {
 251          sampler->ss3.max_aniso = MIN2((gl_sampler->MaxAnisotropy - 2) / 2,
 252                                        BRW_ANISORATIO_16);
 253       }
 254    }
 255    else {
 256       switch (gl_sampler->MagFilter) {
 257       case GL_NEAREST:
 258          sampler->ss0.mag_filter = BRW_MAPFILTER_NEAREST;
 259          using_nearest = true;
 260          break;
 261       case GL_LINEAR:
 262          sampler->ss0.mag_filter = BRW_MAPFILTER_LINEAR;
 263          break;
 264       default:
 265          break;
 266       }
 267    }
 268
 269    sampler->ss1.r_wrap_mode = translate_wrap_mode(gl_sampler->WrapR,
 270                                                   using_nearest);
 271    sampler->ss1.s_wrap_mode = translate_wrap_mode(gl_sampler->WrapS,
 272                                                   using_nearest);
 273    sampler->ss1.t_wrap_mode = translate_wrap_mode(gl_sampler->WrapT,
 274                                                   using_nearest);
 275
 276    if (brw->gen >= 6 &&
 277        sampler->ss0.min_filter != sampler->ss0.mag_filter)
 278         sampler->ss0.min_mag_neq = 1;
 279
 280    /* Cube-maps on 965 and later must use the same wrap mode for all 3
 281     * coordinate dimensions.  Futher, only CUBE and CLAMP are valid.
 282     */
 283    if (texObj->Target == GL_TEXTURE_CUBE_MAP ||
 284        texObj->Target == GL_TEXTURE_CUBE_MAP_ARRAY) {
 285       if ((ctx->Texture.CubeMapSeamless || gl_sampler->CubeMapSeamless) &&
 286           (gl_sampler->MinFilter != GL_NEAREST ||
 287            gl_sampler->MagFilter != GL_NEAREST)) {
 288          sampler->ss1.r_wrap_mode = BRW_TEXCOORDMODE_CUBE;
 289          sampler->ss1.s_wrap_mode = BRW_TEXCOORDMODE_CUBE;
 290          sampler->ss1.t_wrap_mode = BRW_TEXCOORDMODE_CUBE;
 291       } else {
 292          sampler->ss1.r_wrap_mode = BRW_TEXCOORDMODE_CLAMP;
 293          sampler->ss1.s_wrap_mode = BRW_TEXCOORDMODE_CLAMP;
 294          sampler->ss1.t_wrap_mode = BRW_TEXCOORDMODE_CLAMP;
 295       }
 296    } else if (texObj->Target == GL_TEXTURE_1D) {
 297       /* There's a bug in 1D texture sampling - it actually pays
 298        * attention to the wrap_t value, though it should not.
 299        * Override the wrap_t value here to GL_REPEAT to keep
 300        * any nonexistent border pixels from floating in.
 301        */
 302       sampler->ss1.t_wrap_mode = BRW_TEXCOORDMODE_WRAP;
 303    }
 304
 305
 306    /* Set shadow function:
 307     */
 308    if (gl_sampler->CompareMode == GL_COMPARE_R_TO_TEXTURE_ARB) {
 309       /* Shadowing is "enabled" by emitting a particular sampler
 310        * message (sample_c).  So need to recompile WM program when
 311        * shadow comparison is enabled on each/any texture unit.
 312        */
 313       sampler->ss0.shadow_function =
 314          intel_translate_shadow_compare_func(gl_sampler->CompareFunc);
 315    }
 316
 317    /* Set LOD bias:
 318     */
 319    sampler->ss0.lod_bias = S_FIXED(CLAMP(texUnit->LodBias +
 320                                          gl_sampler->LodBias, -16, 15), 6);
 321
 322    sampler->ss0.lod_preclamp = 1; /* OpenGL mode */
 323    sampler->ss0.default_color_mode = 0; /* OpenGL/DX10 mode */
 324
 325    int baselevel = texObj->BaseLevel - intel_image->mt->first_level;
 326    sampler->ss0.base_level = U_FIXED(baselevel, 1);
 327
 328    sampler->ss1.max_lod = U_FIXED(CLAMP(baselevel +
 329                                         gl_sampler->MaxLod, 0, 13), 6);
 330    sampler->ss1.min_lod = U_FIXED(CLAMP(baselevel +
 331                                         gl_sampler->MinLod, 0, 13), 6);
 332
 333    /* On Gen6+, the sampler can handle non-normalized texture
 334     * rectangle coordinates natively
 335     */
 336    if (brw->gen >= 6 && texObj->Target == GL_TEXTURE_RECTANGLE) {
 337       sampler->ss3.non_normalized_coord = 1;
 338    }
 339
 340    upload_default_color(brw, gl_sampler, unit, sdc_offset);
 341
 342    if (brw->gen >= 6) {
 343       sampler->ss2.default_color_pointer = *sdc_offset >> 5;
 344    } else {
 345       /* reloc */
 346       sampler->ss2.default_color_pointer = (brw->batch.bo->offset +
 347                                             *sdc_offset) >> 5;
 348
 349       drm_intel_bo_emit_reloc(brw->batch.bo,
 350                               sampler_state_table_offset +
 351                               ss_index * sizeof(struct brw_sampler_state) +
 352                               offsetof(struct brw_sampler_state, ss2),
 353                               brw->batch.bo, *sdc_offset,
 354                               I915_GEM_DOMAIN_SAMPLER, 0);
 355    }
 356
 357    if (sampler->ss0.min_filter != BRW_MAPFILTER_NEAREST)
 358       sampler->ss3.address_round |= BRW_ADDRESS_ROUNDING_ENABLE_U_MIN |
 359                                     BRW_ADDRESS_ROUNDING_ENABLE_V_MIN |
 360                                     BRW_ADDRESS_ROUNDING_ENABLE_R_MIN;
 361    if (sampler->ss0.mag_filter != BRW_MAPFILTER_NEAREST)
 362       sampler->ss3.address_round |= BRW_ADDRESS_ROUNDING_ENABLE_U_MAG |
 363                                     BRW_ADDRESS_ROUNDING_ENABLE_V_MAG |
 364                                     BRW_ADDRESS_ROUNDING_ENABLE_R_MAG;
 365 }
 366
 367
 368 static void
 369 brw_upload_sampler_state_table(struct brw_context *brw,
 370                                struct gl_program *prog,
 371                                uint32_t sampler_count,
 372                                uint32_t *sst_offset,
 373                                uint32_t *sdc_offset)
 374 {
 375    struct gl_context *ctx = &brw->ctx;
 376    struct brw_sampler_state *samplers;
 377
 378    GLbitfield SamplersUsed = prog->SamplersUsed;
 379
 380    if (sampler_count == 0)
 381       return;
 382
 383    samplers = brw_state_batch(brw, AUB_TRACE_SAMPLER_STATE,
 384                               sampler_count * sizeof(*samplers),
 385                               32, sst_offset);
 386    memset(samplers, 0, sampler_count * sizeof(*samplers));
 387
 388    for (unsigned s = 0; s < sampler_count; s++) {
 389       if (SamplersUsed & (1 << s)) {
 390          const unsigned unit = prog->SamplerUnits[s];
 391          if (ctx->Texture.Unit[unit]._ReallyEnabled)
 392             brw_update_sampler_state(brw, unit, s, &samplers[s],
 393                                      *sst_offset, &sdc_offset[s]);
 394       }
 395    }
 396
 397    brw->state.dirty.cache |= CACHE_NEW_SAMPLER;
 398 }
 399
 400 static void
 401 brw_upload_fs_samplers(struct brw_context *brw)
 402 {
 403    /* BRW_NEW_FRAGMENT_PROGRAM */
 404    struct gl_program *fs = (struct gl_program *) brw->fragment_program;
 405    brw->vtbl.upload_sampler_state_table(brw, fs,
 406                                         brw->wm.base.sampler_count,
 407                                         &brw->wm.base.sampler_offset,
 408                                         brw->wm.base.sdc_offset);
 409 }
 410
 411 const struct brw_tracked_state brw_fs_samplers = {
 412    .dirty = {
 413       .mesa = _NEW_TEXTURE,
 414       .brw = BRW_NEW_BATCH |
 415              BRW_NEW_FRAGMENT_PROGRAM,
 416       .cache = 0
 417    },
 418    .emit = brw_upload_fs_samplers,
 419 };
 420
 421 static void
 422 brw_upload_vs_samplers(struct brw_context *brw)
 423 {
 424    struct brw_stage_state *stage_state = &brw->vs.base;
 425
 426    /* BRW_NEW_VERTEX_PROGRAM */
 427    struct gl_program *vs = (struct gl_program *) brw->vertex_program;
 428    brw->vtbl.upload_sampler_state_table(brw, vs,
 429                                         stage_state->sampler_count,
 430                                         &stage_state->sampler_offset,
 431                                         stage_state->sdc_offset);
 432 }
 433
 434
 435 const struct brw_tracked_state brw_vs_samplers = {
 436    .dirty = {
 437       .mesa = _NEW_TEXTURE,
 438       .brw = BRW_NEW_BATCH |
 439              BRW_NEW_VERTEX_PROGRAM,
 440       .cache = 0
 441    },
 442    .emit = brw_upload_vs_samplers,
 443 };
 444
 445
 446 static void
 447 brw_upload_gs_samplers(struct brw_context *brw)
 448 {
 449    struct brw_stage_state *stage_state = &brw->gs.base;
 450
 451    /* BRW_NEW_GEOMETRY_PROGRAM */
 452    struct gl_program *gs = (struct gl_program *) brw->geometry_program;
 453    if (!gs)
 454       return;
 455
 456    brw->vtbl.upload_sampler_state_table(brw, gs,
 457                                         stage_state->sampler_count,
 458                                         &stage_state->sampler_offset,
 459                                         stage_state->sdc_offset);
 460 }
 461
 462
 463 const struct brw_tracked_state brw_gs_samplers = {
 464    .dirty = {
 465       .mesa = _NEW_TEXTURE,
 466       .brw = BRW_NEW_BATCH |
 467              BRW_NEW_GEOMETRY_PROGRAM,
 468       .cache = 0
 469    },
 470    .emit = brw_upload_gs_samplers,
 471 };
 472
 473
 474 void
 475 gen4_init_vtable_sampler_functions(struct brw_context *brw)
 476 {
 477    brw->vtbl.upload_sampler_state_table = brw_upload_sampler_state_table;
 478 }