src/mesa/state_tracker/st_atom_sampler.c

   1 /**************************************************************************
   2  *
   3  * Copyright 2007 VMware, Inc.
   4  * All Rights Reserved.
   5  *
   6  * Permission is hereby granted, free of charge, to any person obtaining a
   7  * 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, sub license, 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 portions
  16  * of the Software.
  17  *
  18  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
  19  * OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
  20  * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT.
  21  * IN NO EVENT SHALL VMWARE AND/OR ITS SUPPLIERS BE LIABLE FOR
  22  * ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT,
  23  * TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE
  24  * SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
  25  *
  26  **************************************************************************/
  27
  28  /*
  29   * Authors:
  30   *   Keith Whitwell <keithw@vmware.com>
  31   *   Brian Paul
  32   */
  33
  34
  35 #include "main/macros.h"
  36 #include "main/mtypes.h"
  37 #include "main/glformats.h"
  38 #include "main/samplerobj.h"
  39 #include "main/teximage.h"
  40 #include "main/texobj.h"
  41
  42 #include "st_context.h"
  43 #include "st_cb_texture.h"
  44 #include "st_format.h"
  45 #include "st_atom.h"
  46 #include "st_texture.h"
  47 #include "pipe/p_context.h"
  48 #include "pipe/p_defines.h"
  49
  50 #include "cso_cache/cso_context.h"
  51
  52 #include "util/u_format.h"
  53
  54
  55 /**
  56  * Convert GLenum texcoord wrap tokens to pipe tokens.
  57  */
  58 static GLuint
  59 gl_wrap_xlate(GLenum wrap)
  60 {
  61    switch (wrap) {
  62    case GL_REPEAT:
  63       return PIPE_TEX_WRAP_REPEAT;
  64    case GL_CLAMP:
  65       return PIPE_TEX_WRAP_CLAMP;
  66    case GL_CLAMP_TO_EDGE:
  67       return PIPE_TEX_WRAP_CLAMP_TO_EDGE;
  68    case GL_CLAMP_TO_BORDER:
  69       return PIPE_TEX_WRAP_CLAMP_TO_BORDER;
  70    case GL_MIRRORED_REPEAT:
  71       return PIPE_TEX_WRAP_MIRROR_REPEAT;
  72    case GL_MIRROR_CLAMP_EXT:
  73       return PIPE_TEX_WRAP_MIRROR_CLAMP;
  74    case GL_MIRROR_CLAMP_TO_EDGE_EXT:
  75       return PIPE_TEX_WRAP_MIRROR_CLAMP_TO_EDGE;
  76    case GL_MIRROR_CLAMP_TO_BORDER_EXT:
  77       return PIPE_TEX_WRAP_MIRROR_CLAMP_TO_BORDER;
  78    default:
  79       assert(0);
  80       return 0;
  81    }
  82 }
  83
  84
  85 static GLuint
  86 gl_filter_to_mip_filter(GLenum filter)
  87 {
  88    switch (filter) {
  89    case GL_NEAREST:
  90    case GL_LINEAR:
  91       return PIPE_TEX_MIPFILTER_NONE;
  92
  93    case GL_NEAREST_MIPMAP_NEAREST:
  94    case GL_LINEAR_MIPMAP_NEAREST:
  95       return PIPE_TEX_MIPFILTER_NEAREST;
  96
  97    case GL_NEAREST_MIPMAP_LINEAR:
  98    case GL_LINEAR_MIPMAP_LINEAR:
  99       return PIPE_TEX_MIPFILTER_LINEAR;
 100
 101    default:
 102       assert(0);
 103       return PIPE_TEX_MIPFILTER_NONE;
 104    }
 105 }
 106
 107
 108 static GLuint
 109 gl_filter_to_img_filter(GLenum filter)
 110 {
 111    switch (filter) {
 112    case GL_NEAREST:
 113    case GL_NEAREST_MIPMAP_NEAREST:
 114    case GL_NEAREST_MIPMAP_LINEAR:
 115       return PIPE_TEX_FILTER_NEAREST;
 116
 117    case GL_LINEAR:
 118    case GL_LINEAR_MIPMAP_NEAREST:
 119    case GL_LINEAR_MIPMAP_LINEAR:
 120       return PIPE_TEX_FILTER_LINEAR;
 121
 122    default:
 123       assert(0);
 124       return PIPE_TEX_FILTER_NEAREST;
 125    }
 126 }
 127
 128
 129 static void
 130 convert_sampler(struct st_context *st,
 131                 struct pipe_sampler_state *sampler,
 132                 GLuint texUnit)
 133 {
 134    const struct gl_texture_object *texobj;
 135    struct gl_context *ctx = st->ctx;
 136    const struct gl_sampler_object *msamp;
 137    GLenum texBaseFormat;
 138
 139    texobj = ctx->Texture.Unit[texUnit]._Current;
 140    assert(texobj);
 141
 142    msamp = _mesa_get_samplerobj(ctx, texUnit);
 143    texBaseFormat = _mesa_texture_base_format(texobj);
 144
 145    memset(sampler, 0, sizeof(*sampler));
 146    sampler->wrap_s = gl_wrap_xlate(msamp->WrapS);
 147    sampler->wrap_t = gl_wrap_xlate(msamp->WrapT);
 148    sampler->wrap_r = gl_wrap_xlate(msamp->WrapR);
 149
 150    sampler->min_img_filter = gl_filter_to_img_filter(msamp->MinFilter);
 151    sampler->min_mip_filter = gl_filter_to_mip_filter(msamp->MinFilter);
 152    sampler->mag_img_filter = gl_filter_to_img_filter(msamp->MagFilter);
 153
 154    if (texobj->Target != GL_TEXTURE_RECTANGLE_ARB)
 155       sampler->normalized_coords = 1;
 156
 157    sampler->lod_bias = ctx->Texture.Unit[texUnit].LodBias + msamp->LodBias;
 158    /* Reduce the number of states by allowing only the values that AMD GCN
 159     * can represent. Apps use lod_bias for smooth transitions to bigger mipmap
 160     * levels.
 161     */
 162    sampler->lod_bias = CLAMP(sampler->lod_bias, -16, 16);
 163    sampler->lod_bias = floorf(sampler->lod_bias * 256) / 256;
 164
 165    sampler->min_lod = MAX2(msamp->MinLod, 0.0f);
 166    sampler->max_lod = msamp->MaxLod;
 167    if (sampler->max_lod < sampler->min_lod) {
 168       /* The GL spec doesn't seem to specify what to do in this case.
 169        * Swap the values.
 170        */
 171       float tmp = sampler->max_lod;
 172       sampler->max_lod = sampler->min_lod;
 173       sampler->min_lod = tmp;
 174       assert(sampler->min_lod <= sampler->max_lod);
 175    }
 176
 177    /* For non-black borders... */
 178    if (msamp->BorderColor.ui[0] ||
 179        msamp->BorderColor.ui[1] ||
 180        msamp->BorderColor.ui[2] ||
 181        msamp->BorderColor.ui[3]) {
 182       const struct st_texture_object *stobj = st_texture_object_const(texobj);
 183       const GLboolean is_integer = texobj->_IsIntegerFormat;
 184       const struct pipe_sampler_view *sv = NULL;
 185       union pipe_color_union border_color;
 186       GLuint i;
 187
 188       /* Just search for the first used view. We can do this because the
 189          swizzle is per-texture, not per context. */
 190       /* XXX: clean that up to not use the sampler view at all */
 191       for (i = 0; i < stobj->num_sampler_views; ++i) {
 192          if (stobj->sampler_views[i]) {
 193             sv = stobj->sampler_views[i];
 194             break;
 195          }
 196       }
 197
 198       if (st->apply_texture_swizzle_to_border_color && sv) {
 199          const unsigned char swz[4] =
 200          {
 201             sv->swizzle_r,
 202             sv->swizzle_g,
 203             sv->swizzle_b,
 204             sv->swizzle_a,
 205          };
 206
 207          st_translate_color(&msamp->BorderColor,
 208                             &border_color,
 209                             texBaseFormat, is_integer);
 210
 211          util_format_apply_color_swizzle(&sampler->border_color,
 212                                          &border_color, swz, is_integer);
 213       } else {
 214          st_translate_color(&msamp->BorderColor,
 215                             &sampler->border_color,
 216                             texBaseFormat, is_integer);
 217       }
 218    }
 219
 220    sampler->max_anisotropy = (msamp->MaxAnisotropy == 1.0 ?
 221                               0 : (GLuint) msamp->MaxAnisotropy);
 222
 223    /* If sampling a depth texture and using shadow comparison */
 224    if ((texBaseFormat == GL_DEPTH_COMPONENT ||
 225         (texBaseFormat == GL_DEPTH_STENCIL && !texobj->StencilSampling)) &&
 226        msamp->CompareMode == GL_COMPARE_R_TO_TEXTURE) {
 227       sampler->compare_mode = PIPE_TEX_COMPARE_R_TO_TEXTURE;
 228       sampler->compare_func = st_compare_func_to_pipe(msamp->CompareFunc);
 229    }
 230
 231    sampler->seamless_cube_map =
 232       ctx->Texture.CubeMapSeamless || msamp->CubeMapSeamless;
 233 }
 234
 235
 236 /**
 237  * Update the gallium driver's sampler state for fragment, vertex or
 238  * geometry shader stage.
 239  */
 240 static void
 241 update_shader_samplers(struct st_context *st,
 242                        enum pipe_shader_type shader_stage,
 243                        const struct gl_program *prog,
 244                        unsigned max_units,
 245                        struct pipe_sampler_state *samplers,
 246                        unsigned *num_samplers)
 247 {
 248    GLbitfield samplers_used = prog->SamplersUsed;
 249    GLbitfield free_slots = ~prog->SamplersUsed;
 250    GLbitfield external_samplers_used = prog->ExternalSamplersUsed;
 251    GLuint unit;
 252    const GLuint old_max = *num_samplers;
 253    const struct pipe_sampler_state *states[PIPE_MAX_SAMPLERS];
 254
 255    if (*num_samplers == 0 && samplers_used == 0x0)
 256       return;
 257
 258    *num_samplers = 0;
 259
 260    /* loop over sampler units (aka tex image units) */
 261    for (unit = 0; unit < max_units; unit++, samplers_used >>= 1) {
 262       struct pipe_sampler_state *sampler = samplers + unit;
 263
 264       if (samplers_used & 1) {
 265          const GLuint texUnit = prog->SamplerUnits[unit];
 266
 267          convert_sampler(st, sampler, texUnit);
 268          states[unit] = sampler;
 269          *num_samplers = unit + 1;
 270       }
 271       else if (samplers_used != 0 || unit < old_max) {
 272          states[unit] = NULL;
 273       }
 274       else {
 275          /* if we've reset all the old samplers and we have no more new ones */
 276          break;
 277       }
 278    }
 279
 280    /* For any external samplers with multiplaner YUV, stuff the additional
 281     * sampler states we need at the end.
 282     *
 283     * Just re-use the existing sampler-state from the primary slot.
 284     */
 285    while (unlikely(external_samplers_used)) {
 286       GLuint unit = u_bit_scan(&external_samplers_used);
 287       GLuint extra = 0;
 288       struct st_texture_object *stObj =
 289             st_get_texture_object(st->ctx, prog, unit);
 290       struct pipe_sampler_state *sampler = samplers + unit;
 291
 292       if (!stObj)
 293          continue;
 294
 295       switch (st_get_view_format(stObj)) {
 296       case PIPE_FORMAT_NV12:
 297          /* we need one additional sampler: */
 298          extra = u_bit_scan(&free_slots);
 299          states[extra] = sampler;
 300          break;
 301       case PIPE_FORMAT_IYUV:
 302          /* we need two additional samplers: */
 303          extra = u_bit_scan(&free_slots);
 304          states[extra] = sampler;
 305          extra = u_bit_scan(&free_slots);
 306          states[extra] = sampler;
 307          break;
 308       default:
 309          break;
 310       }
 311
 312       *num_samplers = MAX2(*num_samplers, extra + 1);
 313    }
 314
 315    cso_set_samplers(st->cso_context, shader_stage, *num_samplers, states);
 316 }
 317
 318
 319 static void
 320 update_vertex_samplers(struct st_context *st)
 321 {
 322    const struct gl_context *ctx = st->ctx;
 323
 324    update_shader_samplers(st,
 325                           PIPE_SHADER_VERTEX,
 326                           ctx->VertexProgram._Current,
 327                           ctx->Const.Program[MESA_SHADER_VERTEX].MaxTextureImageUnits,
 328                           st->state.samplers[PIPE_SHADER_VERTEX],
 329                           &st->state.num_samplers[PIPE_SHADER_VERTEX]);
 330 }
 331
 332
 333 static void
 334 update_tessctrl_samplers(struct st_context *st)
 335 {
 336    const struct gl_context *ctx = st->ctx;
 337
 338    if (ctx->TessCtrlProgram._Current) {
 339       update_shader_samplers(st,
 340                              PIPE_SHADER_TESS_CTRL,
 341                              ctx->TessCtrlProgram._Current,
 342                              ctx->Const.Program[MESA_SHADER_TESS_CTRL].MaxTextureImageUnits,
 343                              st->state.samplers[PIPE_SHADER_TESS_CTRL],
 344                              &st->state.num_samplers[PIPE_SHADER_TESS_CTRL]);
 345    }
 346 }
 347
 348
 349 static void
 350 update_tesseval_samplers(struct st_context *st)
 351 {
 352    const struct gl_context *ctx = st->ctx;
 353
 354    if (ctx->TessEvalProgram._Current) {
 355       update_shader_samplers(st,
 356                              PIPE_SHADER_TESS_EVAL,
 357                              ctx->TessEvalProgram._Current,
 358                              ctx->Const.Program[MESA_SHADER_TESS_EVAL].MaxTextureImageUnits,
 359                              st->state.samplers[PIPE_SHADER_TESS_EVAL],
 360                              &st->state.num_samplers[PIPE_SHADER_TESS_EVAL]);
 361    }
 362 }
 363
 364
 365 static void
 366 update_geometry_samplers(struct st_context *st)
 367 {
 368    const struct gl_context *ctx = st->ctx;
 369
 370    if (ctx->GeometryProgram._Current) {
 371       update_shader_samplers(st,
 372                              PIPE_SHADER_GEOMETRY,
 373                              ctx->GeometryProgram._Current,
 374                              ctx->Const.Program[MESA_SHADER_GEOMETRY].MaxTextureImageUnits,
 375                              st->state.samplers[PIPE_SHADER_GEOMETRY],
 376                              &st->state.num_samplers[PIPE_SHADER_GEOMETRY]);
 377    }
 378 }
 379
 380
 381 static void
 382 update_fragment_samplers(struct st_context *st)
 383 {
 384    const struct gl_context *ctx = st->ctx;
 385
 386    update_shader_samplers(st,
 387                           PIPE_SHADER_FRAGMENT,
 388                           ctx->FragmentProgram._Current,
 389                           ctx->Const.Program[MESA_SHADER_FRAGMENT].MaxTextureImageUnits,
 390                           st->state.samplers[PIPE_SHADER_FRAGMENT],
 391                           &st->state.num_samplers[PIPE_SHADER_FRAGMENT]);
 392 }
 393
 394
 395 static void
 396 update_compute_samplers(struct st_context *st)
 397 {
 398    const struct gl_context *ctx = st->ctx;
 399
 400    if (ctx->ComputeProgram._Current) {
 401       update_shader_samplers(st,
 402                              PIPE_SHADER_COMPUTE,
 403                              ctx->ComputeProgram._Current,
 404                              ctx->Const.Program[MESA_SHADER_COMPUTE].MaxTextureImageUnits,
 405                              st->state.samplers[PIPE_SHADER_COMPUTE],
 406                              &st->state.num_samplers[PIPE_SHADER_COMPUTE]);
 407    }
 408 }
 409
 410
 411 const struct st_tracked_state st_update_vertex_sampler = {
 412    update_vertex_samplers                               /* update */
 413 };
 414
 415 const struct st_tracked_state st_update_tessctrl_sampler = {
 416    update_tessctrl_samplers                             /* update */
 417 };
 418
 419 const struct st_tracked_state st_update_tesseval_sampler = {
 420    update_tesseval_samplers                             /* update */
 421 };
 422
 423 const struct st_tracked_state st_update_geometry_sampler = {
 424    update_geometry_samplers                             /* update */
 425 };
 426
 427 const struct st_tracked_state st_update_fragment_sampler = {
 428    update_fragment_samplers                             /* update */
 429 };
 430
 431 const struct st_tracked_state st_update_compute_sampler = {
 432    update_compute_samplers                              /* update */
 433 };