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,
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  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_sampler_view.h"
  47 #include "st_texture.h"
  48 #include "pipe/p_context.h"
  49 #include "pipe/p_defines.h"
  50
  51 #include "cso_cache/cso_context.h"
  52
  53 #include "util/u_format.h"
  54
  55
  56 /**
  57  * Convert GLenum texcoord wrap tokens to pipe tokens.
  58  */
  59 static GLuint
  60 gl_wrap_xlate(GLenum wrap)
  61 {
  62    /* Take advantage of how the enums are defined. */
  63    static const unsigned table[32] = {
  64       [GL_REPEAT & 0x1f] = PIPE_TEX_WRAP_REPEAT,
  65       [GL_CLAMP & 0x1f] = PIPE_TEX_WRAP_CLAMP,
  66       [GL_CLAMP_TO_EDGE & 0x1f] = PIPE_TEX_WRAP_CLAMP_TO_EDGE,
  67       [GL_CLAMP_TO_BORDER & 0x1f] = PIPE_TEX_WRAP_CLAMP_TO_BORDER,
  68       [GL_MIRRORED_REPEAT & 0x1f] = PIPE_TEX_WRAP_MIRROR_REPEAT,
  69       [GL_MIRROR_CLAMP_EXT & 0x1f] = PIPE_TEX_WRAP_MIRROR_CLAMP,
  70       [GL_MIRROR_CLAMP_TO_EDGE & 0x1f] = PIPE_TEX_WRAP_MIRROR_CLAMP_TO_EDGE,
  71       [GL_MIRROR_CLAMP_TO_BORDER_EXT & 0x1f] = PIPE_TEX_WRAP_MIRROR_CLAMP_TO_BORDER,
  72    };
  73
  74    return table[wrap & 0x1f];
  75 }
  76
  77
  78 static GLuint
  79 gl_filter_to_mip_filter(GLenum filter)
  80 {
  81    /* Take advantage of how the enums are defined. */
  82    if (filter <= GL_LINEAR)
  83       return PIPE_TEX_MIPFILTER_NONE;
  84    if (filter <= GL_LINEAR_MIPMAP_NEAREST)
  85       return PIPE_TEX_MIPFILTER_NEAREST;
  86
  87    return PIPE_TEX_MIPFILTER_LINEAR;
  88 }
  89
  90
  91 static GLuint
  92 gl_filter_to_img_filter(GLenum filter)
  93 {
  94    /* Take advantage of how the enums are defined. */
  95    if (filter & 1)
  96       return PIPE_TEX_FILTER_LINEAR;
  97
  98    return PIPE_TEX_FILTER_NEAREST;
  99 }
 100
 101
 102 /**
 103  * Convert a gl_sampler_object to a pipe_sampler_state object.
 104  */
 105 void
 106 st_convert_sampler(const struct st_context *st,
 107                    const struct gl_texture_object *texobj,
 108                    const struct gl_sampler_object *msamp,
 109                    float tex_unit_lod_bias,
 110                    struct pipe_sampler_state *sampler)
 111 {
 112    memset(sampler, 0, sizeof(*sampler));
 113    sampler->wrap_s = gl_wrap_xlate(msamp->WrapS);
 114    sampler->wrap_t = gl_wrap_xlate(msamp->WrapT);
 115    sampler->wrap_r = gl_wrap_xlate(msamp->WrapR);
 116
 117    sampler->min_img_filter = gl_filter_to_img_filter(msamp->MinFilter);
 118    sampler->min_mip_filter = gl_filter_to_mip_filter(msamp->MinFilter);
 119    sampler->mag_img_filter = gl_filter_to_img_filter(msamp->MagFilter);
 120
 121    if (texobj->Target != GL_TEXTURE_RECTANGLE_ARB)
 122       sampler->normalized_coords = 1;
 123
 124    sampler->lod_bias = msamp->LodBias + tex_unit_lod_bias;
 125    /* Reduce the number of states by allowing only the values that AMD GCN
 126     * can represent. Apps use lod_bias for smooth transitions to bigger mipmap
 127     * levels.
 128     */
 129    sampler->lod_bias = CLAMP(sampler->lod_bias, -16, 16);
 130    sampler->lod_bias = floorf(sampler->lod_bias * 256) / 256;
 131
 132    sampler->min_lod = MAX2(msamp->MinLod, 0.0f);
 133    sampler->max_lod = msamp->MaxLod;
 134    if (sampler->max_lod < sampler->min_lod) {
 135       /* The GL spec doesn't seem to specify what to do in this case.
 136        * Swap the values.
 137        */
 138       float tmp = sampler->max_lod;
 139       sampler->max_lod = sampler->min_lod;
 140       sampler->min_lod = tmp;
 141       assert(sampler->min_lod <= sampler->max_lod);
 142    }
 143
 144    /* Check that only wrap modes using the border color have the first bit
 145     * set.
 146     */
 147    STATIC_ASSERT(PIPE_TEX_WRAP_CLAMP & 0x1);
 148    STATIC_ASSERT(PIPE_TEX_WRAP_CLAMP_TO_BORDER & 0x1);
 149    STATIC_ASSERT(PIPE_TEX_WRAP_MIRROR_CLAMP & 0x1);
 150    STATIC_ASSERT(PIPE_TEX_WRAP_MIRROR_CLAMP_TO_BORDER & 0x1);
 151    STATIC_ASSERT(((PIPE_TEX_WRAP_REPEAT |
 152                    PIPE_TEX_WRAP_CLAMP_TO_EDGE |
 153                    PIPE_TEX_WRAP_MIRROR_REPEAT |
 154                    PIPE_TEX_WRAP_MIRROR_CLAMP_TO_EDGE) & 0x1) == 0);
 155
 156    /* For non-black borders... */
 157    if (/* This is true if wrap modes are using the border color: */
 158        (sampler->wrap_s | sampler->wrap_t | sampler->wrap_r) & 0x1 &&
 159        (msamp->BorderColor.ui[0] ||
 160         msamp->BorderColor.ui[1] ||
 161         msamp->BorderColor.ui[2] ||
 162         msamp->BorderColor.ui[3])) {
 163       const GLboolean is_integer = texobj->_IsIntegerFormat;
 164       GLenum texBaseFormat = _mesa_base_tex_image(texobj)->_BaseFormat;
 165
 166       if (st->apply_texture_swizzle_to_border_color) {
 167          const struct st_texture_object *stobj = st_texture_object_const(texobj);
 168          /* XXX: clean that up to not use the sampler view at all */
 169          const struct st_sampler_view *sv = st_texture_get_current_sampler_view(st, stobj);
 170
 171          if (sv) {
 172             struct pipe_sampler_view *view = sv->view;
 173             union pipe_color_union tmp;
 174             const unsigned char swz[4] =
 175             {
 176                view->swizzle_r,
 177                view->swizzle_g,
 178                view->swizzle_b,
 179                view->swizzle_a,
 180             };
 181
 182             st_translate_color(&msamp->BorderColor, &tmp,
 183                                texBaseFormat, is_integer);
 184
 185             util_format_apply_color_swizzle(&sampler->border_color,
 186                                             &tmp, swz, is_integer);
 187          } else {
 188             st_translate_color(&msamp->BorderColor,
 189                                &sampler->border_color,
 190                                texBaseFormat, is_integer);
 191          }
 192       } else {
 193          st_translate_color(&msamp->BorderColor,
 194                             &sampler->border_color,
 195                             texBaseFormat, is_integer);
 196       }
 197    }
 198
 199    sampler->max_anisotropy = (msamp->MaxAnisotropy == 1.0 ?
 200                               0 : (GLuint) msamp->MaxAnisotropy);
 201
 202    /* If sampling a depth texture and using shadow comparison */
 203    if (msamp->CompareMode == GL_COMPARE_R_TO_TEXTURE) {
 204       GLenum texBaseFormat = _mesa_base_tex_image(texobj)->_BaseFormat;
 205
 206       if (texBaseFormat == GL_DEPTH_COMPONENT ||
 207           (texBaseFormat == GL_DEPTH_STENCIL && !texobj->StencilSampling)) {
 208          sampler->compare_mode = PIPE_TEX_COMPARE_R_TO_TEXTURE;
 209          sampler->compare_func = st_compare_func_to_pipe(msamp->CompareFunc);
 210       }
 211    }
 212
 213    /* Only set the seamless cube map texture parameter because the per-context
 214     * enable should be ignored and treated as disabled when using texture
 215     * handles, as specified by ARB_bindless_texture.
 216     */
 217    sampler->seamless_cube_map = msamp->CubeMapSeamless;
 218 }
 219
 220 /**
 221  * Get a pipe_sampler_state object from a texture unit.
 222  */
 223 void
 224 st_convert_sampler_from_unit(const struct st_context *st,
 225                              struct pipe_sampler_state *sampler,
 226                              GLuint texUnit)
 227 {
 228    const struct gl_texture_object *texobj;
 229    struct gl_context *ctx = st->ctx;
 230    const struct gl_sampler_object *msamp;
 231
 232    texobj = ctx->Texture.Unit[texUnit]._Current;
 233    assert(texobj);
 234    assert(texobj->Target != GL_TEXTURE_BUFFER);
 235
 236    msamp = _mesa_get_samplerobj(ctx, texUnit);
 237
 238    st_convert_sampler(st, texobj, msamp, ctx->Texture.Unit[texUnit].LodBias,
 239                       sampler);
 240
 241    sampler->seamless_cube_map |= ctx->Texture.CubeMapSeamless;
 242 }
 243
 244
 245 /**
 246  * Update the gallium driver's sampler state for fragment, vertex or
 247  * geometry shader stage.
 248  */
 249 static void
 250 update_shader_samplers(struct st_context *st,
 251                        enum pipe_shader_type shader_stage,
 252                        const struct gl_program *prog,
 253                        struct pipe_sampler_state *samplers,
 254                        unsigned *out_num_samplers)
 255 {
 256    struct gl_context *ctx = st->ctx;
 257    GLbitfield samplers_used = prog->SamplersUsed;
 258    GLbitfield free_slots = ~prog->SamplersUsed;
 259    GLbitfield external_samplers_used = prog->ExternalSamplersUsed;
 260    unsigned unit, num_samplers;
 261    const struct pipe_sampler_state *states[PIPE_MAX_SAMPLERS];
 262
 263    if (samplers_used == 0x0) {
 264       *out_num_samplers = 0;
 265       return;
 266    }
 267
 268    num_samplers = util_last_bit(samplers_used);
 269
 270    /* loop over sampler units (aka tex image units) */
 271    for (unit = 0; samplers_used; unit++, samplers_used >>= 1) {
 272       struct pipe_sampler_state *sampler = samplers + unit;
 273       unsigned tex_unit = prog->SamplerUnits[unit];
 274
 275       /* Don't update the sampler for TBOs. cso_context will not bind sampler
 276        * states that are NULL.
 277        */
 278       if (samplers_used & 1 &&
 279           ctx->Texture.Unit[tex_unit]._Current->Target != GL_TEXTURE_BUFFER) {
 280          st_convert_sampler_from_unit(st, sampler, tex_unit);
 281          states[unit] = sampler;
 282       } else {
 283          states[unit] = NULL;
 284       }
 285    }
 286
 287    /* For any external samplers with multiplaner YUV, stuff the additional
 288     * sampler states we need at the end.
 289     *
 290     * Just re-use the existing sampler-state from the primary slot.
 291     */
 292    while (unlikely(external_samplers_used)) {
 293       GLuint unit = u_bit_scan(&external_samplers_used);
 294       GLuint extra = 0;
 295       struct st_texture_object *stObj =
 296             st_get_texture_object(st->ctx, prog, unit);
 297       struct pipe_sampler_state *sampler = samplers + unit;
 298
 299       if (!stObj)
 300          continue;
 301
 302       switch (st_get_view_format(stObj)) {
 303       case PIPE_FORMAT_NV12:
 304          /* we need one additional sampler: */
 305          extra = u_bit_scan(&free_slots);
 306          states[extra] = sampler;
 307          break;
 308       case PIPE_FORMAT_IYUV:
 309          /* we need two additional samplers: */
 310          extra = u_bit_scan(&free_slots);
 311          states[extra] = sampler;
 312          extra = u_bit_scan(&free_slots);
 313          states[extra] = sampler;
 314          break;
 315       default:
 316          break;
 317       }
 318
 319       num_samplers = MAX2(num_samplers, extra + 1);
 320    }
 321
 322    cso_set_samplers(st->cso_context, shader_stage, num_samplers, states);
 323    *out_num_samplers = num_samplers;
 324 }
 325
 326
 327 void
 328 st_update_vertex_samplers(struct st_context *st)
 329 {
 330    const struct gl_context *ctx = st->ctx;
 331
 332    update_shader_samplers(st,
 333                           PIPE_SHADER_VERTEX,
 334                           ctx->VertexProgram._Current,
 335                           st->state.samplers[PIPE_SHADER_VERTEX],
 336                           &st->state.num_samplers[PIPE_SHADER_VERTEX]);
 337 }
 338
 339
 340 void
 341 st_update_tessctrl_samplers(struct st_context *st)
 342 {
 343    const struct gl_context *ctx = st->ctx;
 344
 345    if (ctx->TessCtrlProgram._Current) {
 346       update_shader_samplers(st,
 347                              PIPE_SHADER_TESS_CTRL,
 348                              ctx->TessCtrlProgram._Current,
 349                              st->state.samplers[PIPE_SHADER_TESS_CTRL],
 350                              &st->state.num_samplers[PIPE_SHADER_TESS_CTRL]);
 351    }
 352 }
 353
 354
 355 void
 356 st_update_tesseval_samplers(struct st_context *st)
 357 {
 358    const struct gl_context *ctx = st->ctx;
 359
 360    if (ctx->TessEvalProgram._Current) {
 361       update_shader_samplers(st,
 362                              PIPE_SHADER_TESS_EVAL,
 363                              ctx->TessEvalProgram._Current,
 364                              st->state.samplers[PIPE_SHADER_TESS_EVAL],
 365                              &st->state.num_samplers[PIPE_SHADER_TESS_EVAL]);
 366    }
 367 }
 368
 369
 370 void
 371 st_update_geometry_samplers(struct st_context *st)
 372 {
 373    const struct gl_context *ctx = st->ctx;
 374
 375    if (ctx->GeometryProgram._Current) {
 376       update_shader_samplers(st,
 377                              PIPE_SHADER_GEOMETRY,
 378                              ctx->GeometryProgram._Current,
 379                              st->state.samplers[PIPE_SHADER_GEOMETRY],
 380                              &st->state.num_samplers[PIPE_SHADER_GEOMETRY]);
 381    }
 382 }
 383
 384
 385 void
 386 st_update_fragment_samplers(struct st_context *st)
 387 {
 388    const struct gl_context *ctx = st->ctx;
 389
 390    update_shader_samplers(st,
 391                           PIPE_SHADER_FRAGMENT,
 392                           ctx->FragmentProgram._Current,
 393                           st->state.samplers[PIPE_SHADER_FRAGMENT],
 394                           &st->state.num_samplers[PIPE_SHADER_FRAGMENT]);
 395 }
 396
 397
 398 void
 399 st_update_compute_samplers(struct st_context *st)
 400 {
 401    const struct gl_context *ctx = st->ctx;
 402
 403    if (ctx->ComputeProgram._Current) {
 404       update_shader_samplers(st,
 405                              PIPE_SHADER_COMPUTE,
 406                              ctx->ComputeProgram._Current,
 407                              st->state.samplers[PIPE_SHADER_COMPUTE],
 408                              &st->state.num_samplers[PIPE_SHADER_COMPUTE]);
 409    }
 410 }