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 /**
 130  * Convert a gl_sampler_object to a pipe_sampler_state object.
 131  */
 132 void
 133 st_convert_sampler(const struct st_context *st,
 134                    const struct gl_texture_object *texobj,
 135                    const struct gl_sampler_object *msamp,
 136                    struct pipe_sampler_state *sampler)
 137 {
 138    struct gl_context *ctx = st->ctx;
 139    GLenum texBaseFormat;
 140
 141    texBaseFormat = _mesa_texture_base_format(texobj);
 142
 143    memset(sampler, 0, sizeof(*sampler));
 144    sampler->wrap_s = gl_wrap_xlate(msamp->WrapS);
 145    sampler->wrap_t = gl_wrap_xlate(msamp->WrapT);
 146    sampler->wrap_r = gl_wrap_xlate(msamp->WrapR);
 147
 148    sampler->min_img_filter = gl_filter_to_img_filter(msamp->MinFilter);
 149    sampler->min_mip_filter = gl_filter_to_mip_filter(msamp->MinFilter);
 150    sampler->mag_img_filter = gl_filter_to_img_filter(msamp->MagFilter);
 151
 152    if (texobj->Target != GL_TEXTURE_RECTANGLE_ARB)
 153       sampler->normalized_coords = 1;
 154
 155    sampler->lod_bias = msamp->LodBias;
 156    /* Reduce the number of states by allowing only the values that AMD GCN
 157     * can represent. Apps use lod_bias for smooth transitions to bigger mipmap
 158     * levels.
 159     */
 160    sampler->lod_bias = CLAMP(sampler->lod_bias, -16, 16);
 161    sampler->lod_bias = floorf(sampler->lod_bias * 256) / 256;
 162
 163    sampler->min_lod = MAX2(msamp->MinLod, 0.0f);
 164    sampler->max_lod = msamp->MaxLod;
 165    if (sampler->max_lod < sampler->min_lod) {
 166       /* The GL spec doesn't seem to specify what to do in this case.
 167        * Swap the values.
 168        */
 169       float tmp = sampler->max_lod;
 170       sampler->max_lod = sampler->min_lod;
 171       sampler->min_lod = tmp;
 172       assert(sampler->min_lod <= sampler->max_lod);
 173    }
 174
 175    /* For non-black borders... */
 176    if (msamp->BorderColor.ui[0] ||
 177        msamp->BorderColor.ui[1] ||
 178        msamp->BorderColor.ui[2] ||
 179        msamp->BorderColor.ui[3]) {
 180       const struct st_texture_object *stobj = st_texture_object_const(texobj);
 181       const GLboolean is_integer = texobj->_IsIntegerFormat;
 182       const struct pipe_sampler_view *sv = NULL;
 183       union pipe_color_union border_color;
 184       GLuint i;
 185
 186       /* Just search for the first used view. We can do this because the
 187          swizzle is per-texture, not per context. */
 188       /* XXX: clean that up to not use the sampler view at all */
 189       for (i = 0; i < stobj->num_sampler_views; ++i) {
 190          if (stobj->sampler_views[i]) {
 191             sv = stobj->sampler_views[i];
 192             break;
 193          }
 194       }
 195
 196       if (st->apply_texture_swizzle_to_border_color && sv) {
 197          const unsigned char swz[4] =
 198          {
 199             sv->swizzle_r,
 200             sv->swizzle_g,
 201             sv->swizzle_b,
 202             sv->swizzle_a,
 203          };
 204
 205          st_translate_color(&msamp->BorderColor,
 206                             &border_color,
 207                             texBaseFormat, is_integer);
 208
 209          util_format_apply_color_swizzle(&sampler->border_color,
 210                                          &border_color, swz, is_integer);
 211       } else {
 212          st_translate_color(&msamp->BorderColor,
 213                             &sampler->border_color,
 214                             texBaseFormat, is_integer);
 215       }
 216    }
 217
 218    sampler->max_anisotropy = (msamp->MaxAnisotropy == 1.0 ?
 219                               0 : (GLuint) msamp->MaxAnisotropy);
 220
 221    /* If sampling a depth texture and using shadow comparison */
 222    if ((texBaseFormat == GL_DEPTH_COMPONENT ||
 223         (texBaseFormat == GL_DEPTH_STENCIL && !texobj->StencilSampling)) &&
 224        msamp->CompareMode == GL_COMPARE_R_TO_TEXTURE) {
 225       sampler->compare_mode = PIPE_TEX_COMPARE_R_TO_TEXTURE;
 226       sampler->compare_func = st_compare_func_to_pipe(msamp->CompareFunc);
 227    }
 228
 229    sampler->seamless_cube_map =
 230       ctx->Texture.CubeMapSeamless || msamp->CubeMapSeamless;
 231 }
 232
 233
 234 static void
 235 convert_sampler_from_unit(const struct st_context *st,
 236                           struct pipe_sampler_state *sampler,
 237                           GLuint texUnit)
 238 {
 239    const struct gl_texture_object *texobj;
 240    struct gl_context *ctx = st->ctx;
 241    const struct gl_sampler_object *msamp;
 242
 243    texobj = ctx->Texture.Unit[texUnit]._Current;
 244    assert(texobj);
 245
 246    msamp = _mesa_get_samplerobj(ctx, texUnit);
 247
 248    st_convert_sampler(st, texobj, msamp, sampler);
 249
 250    sampler->lod_bias += ctx->Texture.Unit[texUnit].LodBias;
 251 }
 252
 253
 254 /**
 255  * Update the gallium driver's sampler state for fragment, vertex or
 256  * geometry shader stage.
 257  */
 258 static void
 259 update_shader_samplers(struct st_context *st,
 260                        enum pipe_shader_type shader_stage,
 261                        const struct gl_program *prog,
 262                        unsigned max_units,
 263                        struct pipe_sampler_state *samplers,
 264                        unsigned *num_samplers)
 265 {
 266    GLbitfield samplers_used = prog->SamplersUsed;
 267    GLbitfield free_slots = ~prog->SamplersUsed;
 268    GLbitfield external_samplers_used = prog->ExternalSamplersUsed;
 269    GLuint unit;
 270    const GLuint old_max = *num_samplers;
 271    const struct pipe_sampler_state *states[PIPE_MAX_SAMPLERS];
 272
 273    if (*num_samplers == 0 && samplers_used == 0x0)
 274       return;
 275
 276    *num_samplers = 0;
 277
 278    /* loop over sampler units (aka tex image units) */
 279    for (unit = 0; unit < max_units; unit++, samplers_used >>= 1) {
 280       struct pipe_sampler_state *sampler = samplers + unit;
 281
 282       if (samplers_used & 1) {
 283          const GLuint texUnit = prog->SamplerUnits[unit];
 284
 285          convert_sampler_from_unit(st, sampler, texUnit);
 286          states[unit] = sampler;
 287          *num_samplers = unit + 1;
 288       }
 289       else if (samplers_used != 0 || unit < old_max) {
 290          states[unit] = NULL;
 291       }
 292       else {
 293          /* if we've reset all the old samplers and we have no more new ones */
 294          break;
 295       }
 296    }
 297
 298    /* For any external samplers with multiplaner YUV, stuff the additional
 299     * sampler states we need at the end.
 300     *
 301     * Just re-use the existing sampler-state from the primary slot.
 302     */
 303    while (unlikely(external_samplers_used)) {
 304       GLuint unit = u_bit_scan(&external_samplers_used);
 305       GLuint extra = 0;
 306       struct st_texture_object *stObj =
 307             st_get_texture_object(st->ctx, prog, unit);
 308       struct pipe_sampler_state *sampler = samplers + unit;
 309
 310       if (!stObj)
 311          continue;
 312
 313       switch (st_get_view_format(stObj)) {
 314       case PIPE_FORMAT_NV12:
 315          /* we need one additional sampler: */
 316          extra = u_bit_scan(&free_slots);
 317          states[extra] = sampler;
 318          break;
 319       case PIPE_FORMAT_IYUV:
 320          /* we need two additional samplers: */
 321          extra = u_bit_scan(&free_slots);
 322          states[extra] = sampler;
 323          extra = u_bit_scan(&free_slots);
 324          states[extra] = sampler;
 325          break;
 326       default:
 327          break;
 328       }
 329
 330       *num_samplers = MAX2(*num_samplers, extra + 1);
 331    }
 332
 333    cso_set_samplers(st->cso_context, shader_stage, *num_samplers, states);
 334 }
 335
 336
 337 void
 338 st_update_vertex_samplers(struct st_context *st)
 339 {
 340    const struct gl_context *ctx = st->ctx;
 341
 342    update_shader_samplers(st,
 343                           PIPE_SHADER_VERTEX,
 344                           ctx->VertexProgram._Current,
 345                           ctx->Const.Program[MESA_SHADER_VERTEX].MaxTextureImageUnits,
 346                           st->state.samplers[PIPE_SHADER_VERTEX],
 347                           &st->state.num_samplers[PIPE_SHADER_VERTEX]);
 348 }
 349
 350
 351 void
 352 st_update_tessctrl_samplers(struct st_context *st)
 353 {
 354    const struct gl_context *ctx = st->ctx;
 355
 356    if (ctx->TessCtrlProgram._Current) {
 357       update_shader_samplers(st,
 358                              PIPE_SHADER_TESS_CTRL,
 359                              ctx->TessCtrlProgram._Current,
 360                              ctx->Const.Program[MESA_SHADER_TESS_CTRL].MaxTextureImageUnits,
 361                              st->state.samplers[PIPE_SHADER_TESS_CTRL],
 362                              &st->state.num_samplers[PIPE_SHADER_TESS_CTRL]);
 363    }
 364 }
 365
 366
 367 void
 368 st_update_tesseval_samplers(struct st_context *st)
 369 {
 370    const struct gl_context *ctx = st->ctx;
 371
 372    if (ctx->TessEvalProgram._Current) {
 373       update_shader_samplers(st,
 374                              PIPE_SHADER_TESS_EVAL,
 375                              ctx->TessEvalProgram._Current,
 376                              ctx->Const.Program[MESA_SHADER_TESS_EVAL].MaxTextureImageUnits,
 377                              st->state.samplers[PIPE_SHADER_TESS_EVAL],
 378                              &st->state.num_samplers[PIPE_SHADER_TESS_EVAL]);
 379    }
 380 }
 381
 382
 383 void
 384 st_update_geometry_samplers(struct st_context *st)
 385 {
 386    const struct gl_context *ctx = st->ctx;
 387
 388    if (ctx->GeometryProgram._Current) {
 389       update_shader_samplers(st,
 390                              PIPE_SHADER_GEOMETRY,
 391                              ctx->GeometryProgram._Current,
 392                              ctx->Const.Program[MESA_SHADER_GEOMETRY].MaxTextureImageUnits,
 393                              st->state.samplers[PIPE_SHADER_GEOMETRY],
 394                              &st->state.num_samplers[PIPE_SHADER_GEOMETRY]);
 395    }
 396 }
 397
 398
 399 void
 400 st_update_fragment_samplers(struct st_context *st)
 401 {
 402    const struct gl_context *ctx = st->ctx;
 403
 404    update_shader_samplers(st,
 405                           PIPE_SHADER_FRAGMENT,
 406                           ctx->FragmentProgram._Current,
 407                           ctx->Const.Program[MESA_SHADER_FRAGMENT].MaxTextureImageUnits,
 408                           st->state.samplers[PIPE_SHADER_FRAGMENT],
 409                           &st->state.num_samplers[PIPE_SHADER_FRAGMENT]);
 410 }
 411
 412
 413 void
 414 st_update_compute_samplers(struct st_context *st)
 415 {
 416    const struct gl_context *ctx = st->ctx;
 417
 418    if (ctx->ComputeProgram._Current) {
 419       update_shader_samplers(st,
 420                              PIPE_SHADER_COMPUTE,
 421                              ctx->ComputeProgram._Current,
 422                              ctx->Const.Program[MESA_SHADER_COMPUTE].MaxTextureImageUnits,
 423                              st->state.samplers[PIPE_SHADER_COMPUTE],
 424                              &st->state.num_samplers[PIPE_SHADER_COMPUTE]);
 425    }
 426 }