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_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/format/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 (texobj->StencilSampling)
 167          texBaseFormat = GL_STENCIL_INDEX;
 168
 169       if (st->apply_texture_swizzle_to_border_color) {
 170          const struct st_texture_object *stobj = st_texture_object_const(texobj);
 171          /* XXX: clean that up to not use the sampler view at all */
 172          const struct st_sampler_view *sv = st_texture_get_current_sampler_view(st, stobj);
 173
 174          if (sv) {
 175             struct pipe_sampler_view *view = sv->view;
 176             union pipe_color_union tmp;
 177             const unsigned char swz[4] =
 178             {
 179                view->swizzle_r,
 180                view->swizzle_g,
 181                view->swizzle_b,
 182                view->swizzle_a,
 183             };
 184
 185             st_translate_color(&msamp->BorderColor, &tmp,
 186                                texBaseFormat, is_integer);
 187
 188             util_format_apply_color_swizzle(&sampler->border_color,
 189                                             &tmp, swz, is_integer);
 190          } else {
 191             st_translate_color(&msamp->BorderColor,
 192                                &sampler->border_color,
 193                                texBaseFormat, is_integer);
 194          }
 195       } else {
 196          st_translate_color(&msamp->BorderColor,
 197                             &sampler->border_color,
 198                             texBaseFormat, is_integer);
 199       }
 200    }
 201
 202    sampler->max_anisotropy = (msamp->MaxAnisotropy == 1.0 ?
 203                               0 : (GLuint) msamp->MaxAnisotropy);
 204
 205    /* If sampling a depth texture and using shadow comparison */
 206    if (msamp->CompareMode == GL_COMPARE_R_TO_TEXTURE) {
 207       GLenum texBaseFormat = _mesa_base_tex_image(texobj)->_BaseFormat;
 208
 209       if (texBaseFormat == GL_DEPTH_COMPONENT ||
 210           (texBaseFormat == GL_DEPTH_STENCIL && !texobj->StencilSampling)) {
 211          sampler->compare_mode = PIPE_TEX_COMPARE_R_TO_TEXTURE;
 212          sampler->compare_func = st_compare_func_to_pipe(msamp->CompareFunc);
 213       }
 214    }
 215
 216    /* Only set the seamless cube map texture parameter because the per-context
 217     * enable should be ignored and treated as disabled when using texture
 218     * handles, as specified by ARB_bindless_texture.
 219     */
 220    sampler->seamless_cube_map = msamp->CubeMapSeamless;
 221 }
 222
 223 /**
 224  * Get a pipe_sampler_state object from a texture unit.
 225  */
 226 void
 227 st_convert_sampler_from_unit(const struct st_context *st,
 228                              struct pipe_sampler_state *sampler,
 229                              GLuint texUnit)
 230 {
 231    const struct gl_texture_object *texobj;
 232    struct gl_context *ctx = st->ctx;
 233    const struct gl_sampler_object *msamp;
 234
 235    texobj = ctx->Texture.Unit[texUnit]._Current;
 236    assert(texobj);
 237    assert(texobj->Target != GL_TEXTURE_BUFFER);
 238
 239    msamp = _mesa_get_samplerobj(ctx, texUnit);
 240
 241    st_convert_sampler(st, texobj, msamp, ctx->Texture.Unit[texUnit].LodBias,
 242                       sampler);
 243
 244    sampler->seamless_cube_map |= ctx->Texture.CubeMapSeamless;
 245 }
 246
 247
 248 /**
 249  * Update the gallium driver's sampler state for fragment, vertex or
 250  * geometry shader stage.
 251  */
 252 static void
 253 update_shader_samplers(struct st_context *st,
 254                        enum pipe_shader_type shader_stage,
 255                        const struct gl_program *prog,
 256                        struct pipe_sampler_state *samplers,
 257                        unsigned *out_num_samplers)
 258 {
 259    struct gl_context *ctx = st->ctx;
 260    GLbitfield samplers_used = prog->SamplersUsed;
 261    GLbitfield free_slots = ~prog->SamplersUsed;
 262    GLbitfield external_samplers_used = prog->ExternalSamplersUsed;
 263    unsigned unit, num_samplers;
 264    struct pipe_sampler_state local_samplers[PIPE_MAX_SAMPLERS];
 265    const struct pipe_sampler_state *states[PIPE_MAX_SAMPLERS];
 266
 267    if (samplers_used == 0x0) {
 268       if (out_num_samplers)
 269          *out_num_samplers = 0;
 270       return;
 271    }
 272
 273    if (!samplers)
 274       samplers = local_samplers;
 275
 276    num_samplers = util_last_bit(samplers_used);
 277
 278    /* loop over sampler units (aka tex image units) */
 279    for (unit = 0; samplers_used; unit++, samplers_used >>= 1) {
 280       struct pipe_sampler_state *sampler = samplers + unit;
 281       unsigned tex_unit = prog->SamplerUnits[unit];
 282
 283       /* Don't update the sampler for TBOs. cso_context will not bind sampler
 284        * states that are NULL.
 285        */
 286       if (samplers_used & 1 &&
 287           ctx->Texture.Unit[tex_unit]._Current->Target != GL_TEXTURE_BUFFER) {
 288          st_convert_sampler_from_unit(st, sampler, tex_unit);
 289          states[unit] = sampler;
 290       } else {
 291          states[unit] = NULL;
 292       }
 293    }
 294
 295    /* For any external samplers with multiplaner YUV, stuff the additional
 296     * sampler states we need at the end.
 297     *
 298     * Just re-use the existing sampler-state from the primary slot.
 299     */
 300    while (unlikely(external_samplers_used)) {
 301       GLuint unit = u_bit_scan(&external_samplers_used);
 302       GLuint extra = 0;
 303       struct st_texture_object *stObj =
 304             st_get_texture_object(st->ctx, prog, unit);
 305       struct pipe_sampler_state *sampler = samplers + unit;
 306
 307       /* if resource format matches then YUV wasn't lowered */
 308       if (!stObj || st_get_view_format(stObj) == stObj->pt->format)
 309          continue;
 310
 311       switch (st_get_view_format(stObj)) {
 312       case PIPE_FORMAT_NV12:
 313       case PIPE_FORMAT_P010:
 314       case PIPE_FORMAT_P016:
 315       case PIPE_FORMAT_YUYV:
 316       case PIPE_FORMAT_UYVY:
 317          /* we need one additional sampler: */
 318          extra = u_bit_scan(&free_slots);
 319          states[extra] = sampler;
 320          break;
 321       case PIPE_FORMAT_IYUV:
 322          /* we need two additional samplers: */
 323          extra = u_bit_scan(&free_slots);
 324          states[extra] = sampler;
 325          extra = u_bit_scan(&free_slots);
 326          states[extra] = sampler;
 327          break;
 328       default:
 329          break;
 330       }
 331
 332       num_samplers = MAX2(num_samplers, extra + 1);
 333    }
 334
 335    cso_set_samplers(st->cso_context, shader_stage, num_samplers, states);
 336
 337    if (out_num_samplers)
 338       *out_num_samplers = num_samplers;
 339 }
 340
 341
 342 void
 343 st_update_vertex_samplers(struct st_context *st)
 344 {
 345    const struct gl_context *ctx = st->ctx;
 346
 347    update_shader_samplers(st,
 348                           PIPE_SHADER_VERTEX,
 349                           ctx->VertexProgram._Current,
 350                           st->state.vert_samplers,
 351                           &st->state.num_vert_samplers);
 352 }
 353
 354
 355 void
 356 st_update_tessctrl_samplers(struct st_context *st)
 357 {
 358    const struct gl_context *ctx = st->ctx;
 359
 360    if (ctx->TessCtrlProgram._Current) {
 361       update_shader_samplers(st,
 362                              PIPE_SHADER_TESS_CTRL,
 363                              ctx->TessCtrlProgram._Current, NULL, NULL);
 364    }
 365 }
 366
 367
 368 void
 369 st_update_tesseval_samplers(struct st_context *st)
 370 {
 371    const struct gl_context *ctx = st->ctx;
 372
 373    if (ctx->TessEvalProgram._Current) {
 374       update_shader_samplers(st,
 375                              PIPE_SHADER_TESS_EVAL,
 376                              ctx->TessEvalProgram._Current, NULL, NULL);
 377    }
 378 }
 379
 380
 381 void
 382 st_update_geometry_samplers(struct st_context *st)
 383 {
 384    const struct gl_context *ctx = st->ctx;
 385
 386    if (ctx->GeometryProgram._Current) {
 387       update_shader_samplers(st,
 388                              PIPE_SHADER_GEOMETRY,
 389                              ctx->GeometryProgram._Current, NULL, NULL);
 390    }
 391 }
 392
 393
 394 void
 395 st_update_fragment_samplers(struct st_context *st)
 396 {
 397    const struct gl_context *ctx = st->ctx;
 398
 399    update_shader_samplers(st,
 400                           PIPE_SHADER_FRAGMENT,
 401                           ctx->FragmentProgram._Current,
 402                           st->state.frag_samplers,
 403                           &st->state.num_frag_samplers);
 404 }
 405
 406
 407 void
 408 st_update_compute_samplers(struct st_context *st)
 409 {
 410    const struct gl_context *ctx = st->ctx;
 411
 412    if (ctx->ComputeProgram._Current) {
 413       update_shader_samplers(st,
 414                              PIPE_SHADER_COMPUTE,
 415                              ctx->ComputeProgram._Current, NULL, NULL);
 416    }
 417 }