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    if (texobj->_IsIntegerFormat && st->ctx->Const.ForceIntegerTexNearest) {
 118       sampler->min_img_filter = gl_filter_to_img_filter(GL_NEAREST);
 119       sampler->mag_img_filter = gl_filter_to_img_filter(GL_NEAREST);
 120    } else {
 121       sampler->min_img_filter = gl_filter_to_img_filter(msamp->MinFilter);
 122       sampler->mag_img_filter = gl_filter_to_img_filter(msamp->MagFilter);
 123    }
 124    sampler->min_mip_filter = gl_filter_to_mip_filter(msamp->MinFilter);
 125
 126    if (texobj->Target != GL_TEXTURE_RECTANGLE_ARB)
 127       sampler->normalized_coords = 1;
 128
 129    sampler->lod_bias = msamp->LodBias + tex_unit_lod_bias;
 130    /* Reduce the number of states by allowing only the values that AMD GCN
 131     * can represent. Apps use lod_bias for smooth transitions to bigger mipmap
 132     * levels.
 133     */
 134    sampler->lod_bias = CLAMP(sampler->lod_bias, -16, 16);
 135    sampler->lod_bias = floorf(sampler->lod_bias * 256) / 256;
 136
 137    sampler->min_lod = MAX2(msamp->MinLod, 0.0f);
 138    sampler->max_lod = msamp->MaxLod;
 139    if (sampler->max_lod < sampler->min_lod) {
 140       /* The GL spec doesn't seem to specify what to do in this case.
 141        * Swap the values.
 142        */
 143       float tmp = sampler->max_lod;
 144       sampler->max_lod = sampler->min_lod;
 145       sampler->min_lod = tmp;
 146       assert(sampler->min_lod <= sampler->max_lod);
 147    }
 148
 149    /* Check that only wrap modes using the border color have the first bit
 150     * set.
 151     */
 152    STATIC_ASSERT(PIPE_TEX_WRAP_CLAMP & 0x1);
 153    STATIC_ASSERT(PIPE_TEX_WRAP_CLAMP_TO_BORDER & 0x1);
 154    STATIC_ASSERT(PIPE_TEX_WRAP_MIRROR_CLAMP & 0x1);
 155    STATIC_ASSERT(PIPE_TEX_WRAP_MIRROR_CLAMP_TO_BORDER & 0x1);
 156    STATIC_ASSERT(((PIPE_TEX_WRAP_REPEAT |
 157                    PIPE_TEX_WRAP_CLAMP_TO_EDGE |
 158                    PIPE_TEX_WRAP_MIRROR_REPEAT |
 159                    PIPE_TEX_WRAP_MIRROR_CLAMP_TO_EDGE) & 0x1) == 0);
 160
 161    /* For non-black borders... */
 162    if (/* This is true if wrap modes are using the border color: */
 163        (sampler->wrap_s | sampler->wrap_t | sampler->wrap_r) & 0x1 &&
 164        (msamp->BorderColor.ui[0] ||
 165         msamp->BorderColor.ui[1] ||
 166         msamp->BorderColor.ui[2] ||
 167         msamp->BorderColor.ui[3])) {
 168       const GLboolean is_integer = texobj->_IsIntegerFormat;
 169       GLenum texBaseFormat = _mesa_base_tex_image(texobj)->_BaseFormat;
 170
 171       if (texobj->StencilSampling)
 172          texBaseFormat = GL_STENCIL_INDEX;
 173
 174       if (st->apply_texture_swizzle_to_border_color) {
 175          const struct st_texture_object *stobj = st_texture_object_const(texobj);
 176          /* XXX: clean that up to not use the sampler view at all */
 177          const struct st_sampler_view *sv = st_texture_get_current_sampler_view(st, stobj);
 178
 179          if (sv) {
 180             struct pipe_sampler_view *view = sv->view;
 181             union pipe_color_union tmp;
 182             const unsigned char swz[4] =
 183             {
 184                view->swizzle_r,
 185                view->swizzle_g,
 186                view->swizzle_b,
 187                view->swizzle_a,
 188             };
 189
 190             st_translate_color(&msamp->BorderColor, &tmp,
 191                                texBaseFormat, is_integer);
 192
 193             util_format_apply_color_swizzle(&sampler->border_color,
 194                                             &tmp, swz, is_integer);
 195          } else {
 196             st_translate_color(&msamp->BorderColor,
 197                                &sampler->border_color,
 198                                texBaseFormat, is_integer);
 199          }
 200       } else {
 201          st_translate_color(&msamp->BorderColor,
 202                             &sampler->border_color,
 203                             texBaseFormat, is_integer);
 204       }
 205    }
 206
 207    sampler->max_anisotropy = (msamp->MaxAnisotropy == 1.0 ?
 208                               0 : (GLuint) msamp->MaxAnisotropy);
 209
 210    /* If sampling a depth texture and using shadow comparison */
 211    if (msamp->CompareMode == GL_COMPARE_R_TO_TEXTURE) {
 212       GLenum texBaseFormat = _mesa_base_tex_image(texobj)->_BaseFormat;
 213
 214       if (texBaseFormat == GL_DEPTH_COMPONENT ||
 215           (texBaseFormat == GL_DEPTH_STENCIL && !texobj->StencilSampling)) {
 216          sampler->compare_mode = PIPE_TEX_COMPARE_R_TO_TEXTURE;
 217          sampler->compare_func = st_compare_func_to_pipe(msamp->CompareFunc);
 218       }
 219    }
 220
 221    /* Only set the seamless cube map texture parameter because the per-context
 222     * enable should be ignored and treated as disabled when using texture
 223     * handles, as specified by ARB_bindless_texture.
 224     */
 225    sampler->seamless_cube_map = msamp->CubeMapSeamless;
 226 }
 227
 228 /**
 229  * Get a pipe_sampler_state object from a texture unit.
 230  */
 231 void
 232 st_convert_sampler_from_unit(const struct st_context *st,
 233                              struct pipe_sampler_state *sampler,
 234                              GLuint texUnit)
 235 {
 236    const struct gl_texture_object *texobj;
 237    struct gl_context *ctx = st->ctx;
 238    const struct gl_sampler_object *msamp;
 239
 240    texobj = ctx->Texture.Unit[texUnit]._Current;
 241    assert(texobj);
 242    assert(texobj->Target != GL_TEXTURE_BUFFER);
 243
 244    msamp = _mesa_get_samplerobj(ctx, texUnit);
 245
 246    st_convert_sampler(st, texobj, msamp, ctx->Texture.Unit[texUnit].LodBias,
 247                       sampler);
 248
 249    sampler->seamless_cube_map |= ctx->Texture.CubeMapSeamless;
 250 }
 251
 252
 253 /**
 254  * Update the gallium driver's sampler state for fragment, vertex or
 255  * geometry shader stage.
 256  */
 257 static void
 258 update_shader_samplers(struct st_context *st,
 259                        enum pipe_shader_type shader_stage,
 260                        const struct gl_program *prog,
 261                        struct pipe_sampler_state *samplers,
 262                        unsigned *out_num_samplers)
 263 {
 264    struct gl_context *ctx = st->ctx;
 265    GLbitfield samplers_used = prog->SamplersUsed;
 266    GLbitfield free_slots = ~prog->SamplersUsed;
 267    GLbitfield external_samplers_used = prog->ExternalSamplersUsed;
 268    unsigned unit, num_samplers;
 269    struct pipe_sampler_state local_samplers[PIPE_MAX_SAMPLERS];
 270    const struct pipe_sampler_state *states[PIPE_MAX_SAMPLERS];
 271
 272    if (samplers_used == 0x0) {
 273       if (out_num_samplers)
 274          *out_num_samplers = 0;
 275       return;
 276    }
 277
 278    if (!samplers)
 279       samplers = local_samplers;
 280
 281    num_samplers = util_last_bit(samplers_used);
 282
 283    /* loop over sampler units (aka tex image units) */
 284    for (unit = 0; samplers_used; unit++, samplers_used >>= 1) {
 285       struct pipe_sampler_state *sampler = samplers + unit;
 286       unsigned tex_unit = prog->SamplerUnits[unit];
 287
 288       /* Don't update the sampler for TBOs. cso_context will not bind sampler
 289        * states that are NULL.
 290        */
 291       if (samplers_used & 1 &&
 292           ctx->Texture.Unit[tex_unit]._Current->Target != GL_TEXTURE_BUFFER) {
 293          st_convert_sampler_from_unit(st, sampler, tex_unit);
 294          states[unit] = sampler;
 295       } else {
 296          states[unit] = NULL;
 297       }
 298    }
 299
 300    /* For any external samplers with multiplaner YUV, stuff the additional
 301     * sampler states we need at the end.
 302     *
 303     * Just re-use the existing sampler-state from the primary slot.
 304     */
 305    while (unlikely(external_samplers_used)) {
 306       GLuint unit = u_bit_scan(&external_samplers_used);
 307       GLuint extra = 0;
 308       struct st_texture_object *stObj =
 309             st_get_texture_object(st->ctx, prog, unit);
 310       struct pipe_sampler_state *sampler = samplers + unit;
 311
 312       /* if resource format matches then YUV wasn't lowered */
 313       if (!stObj || st_get_view_format(stObj) == stObj->pt->format)
 314          continue;
 315
 316       switch (st_get_view_format(stObj)) {
 317       case PIPE_FORMAT_NV12:
 318       case PIPE_FORMAT_P010:
 319       case PIPE_FORMAT_P016:
 320       case PIPE_FORMAT_YUYV:
 321       case PIPE_FORMAT_UYVY:
 322          /* we need one additional sampler: */
 323          extra = u_bit_scan(&free_slots);
 324          states[extra] = sampler;
 325          break;
 326       case PIPE_FORMAT_IYUV:
 327          /* we need two additional samplers: */
 328          extra = u_bit_scan(&free_slots);
 329          states[extra] = sampler;
 330          extra = u_bit_scan(&free_slots);
 331          states[extra] = sampler;
 332          break;
 333       default:
 334          break;
 335       }
 336
 337       num_samplers = MAX2(num_samplers, extra + 1);
 338    }
 339
 340    cso_set_samplers(st->cso_context, shader_stage, num_samplers, states);
 341
 342    if (out_num_samplers)
 343       *out_num_samplers = num_samplers;
 344 }
 345
 346
 347 void
 348 st_update_vertex_samplers(struct st_context *st)
 349 {
 350    const struct gl_context *ctx = st->ctx;
 351
 352    update_shader_samplers(st,
 353                           PIPE_SHADER_VERTEX,
 354                           ctx->VertexProgram._Current,
 355                           st->state.vert_samplers,
 356                           &st->state.num_vert_samplers);
 357 }
 358
 359
 360 void
 361 st_update_tessctrl_samplers(struct st_context *st)
 362 {
 363    const struct gl_context *ctx = st->ctx;
 364
 365    if (ctx->TessCtrlProgram._Current) {
 366       update_shader_samplers(st,
 367                              PIPE_SHADER_TESS_CTRL,
 368                              ctx->TessCtrlProgram._Current, NULL, NULL);
 369    }
 370 }
 371
 372
 373 void
 374 st_update_tesseval_samplers(struct st_context *st)
 375 {
 376    const struct gl_context *ctx = st->ctx;
 377
 378    if (ctx->TessEvalProgram._Current) {
 379       update_shader_samplers(st,
 380                              PIPE_SHADER_TESS_EVAL,
 381                              ctx->TessEvalProgram._Current, NULL, NULL);
 382    }
 383 }
 384
 385
 386 void
 387 st_update_geometry_samplers(struct st_context *st)
 388 {
 389    const struct gl_context *ctx = st->ctx;
 390
 391    if (ctx->GeometryProgram._Current) {
 392       update_shader_samplers(st,
 393                              PIPE_SHADER_GEOMETRY,
 394                              ctx->GeometryProgram._Current, NULL, NULL);
 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                           st->state.frag_samplers,
 408                           &st->state.num_frag_samplers);
 409 }
 410
 411
 412 void
 413 st_update_compute_samplers(struct st_context *st)
 414 {
 415    const struct gl_context *ctx = st->ctx;
 416
 417    if (ctx->ComputeProgram._Current) {
 418       update_shader_samplers(st,
 419                              PIPE_SHADER_COMPUTE,
 420                              ctx->ComputeProgram._Current, NULL, NULL);
 421    }
 422 }