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    /* Take advantage of how the enums are defined. */
  62    static const unsigned table[32] = {
  63       [GL_REPEAT & 0x1f] = PIPE_TEX_WRAP_REPEAT,
  64       [GL_CLAMP & 0x1f] = PIPE_TEX_WRAP_CLAMP,
  65       [GL_CLAMP_TO_EDGE & 0x1f] = PIPE_TEX_WRAP_CLAMP_TO_EDGE,
  66       [GL_CLAMP_TO_BORDER & 0x1f] = PIPE_TEX_WRAP_CLAMP_TO_BORDER,
  67       [GL_MIRRORED_REPEAT & 0x1f] = PIPE_TEX_WRAP_MIRROR_REPEAT,
  68       [GL_MIRROR_CLAMP_EXT & 0x1f] = PIPE_TEX_WRAP_MIRROR_CLAMP,
  69       [GL_MIRROR_CLAMP_TO_EDGE & 0x1f] = PIPE_TEX_WRAP_MIRROR_CLAMP_TO_EDGE,
  70       [GL_MIRROR_CLAMP_TO_BORDER_EXT & 0x1f] = PIPE_TEX_WRAP_MIRROR_CLAMP_TO_BORDER,
  71    };
  72
  73    return table[wrap & 0x1f];
  74 }
  75
  76
  77 static GLuint
  78 gl_filter_to_mip_filter(GLenum filter)
  79 {
  80    /* Take advantage of how the enums are defined. */
  81    if (filter <= GL_LINEAR)
  82       return PIPE_TEX_MIPFILTER_NONE;
  83    if (filter <= GL_LINEAR_MIPMAP_NEAREST)
  84       return PIPE_TEX_MIPFILTER_NEAREST;
  85
  86    return PIPE_TEX_MIPFILTER_LINEAR;
  87 }
  88
  89
  90 static GLuint
  91 gl_filter_to_img_filter(GLenum filter)
  92 {
  93    /* Take advantage of how the enums are defined. */
  94    if (filter & 1)
  95       return PIPE_TEX_FILTER_LINEAR;
  96
  97    return PIPE_TEX_FILTER_NEAREST;
  98 }
  99
 100
 101 /**
 102  * Convert a gl_sampler_object to a pipe_sampler_state object.
 103  */
 104 void
 105 st_convert_sampler(const struct st_context *st,
 106                    const struct gl_texture_object *texobj,
 107                    const struct gl_sampler_object *msamp,
 108                    float tex_unit_lod_bias,
 109                    struct pipe_sampler_state *sampler)
 110 {
 111    memset(sampler, 0, sizeof(*sampler));
 112    sampler->wrap_s = gl_wrap_xlate(msamp->WrapS);
 113    sampler->wrap_t = gl_wrap_xlate(msamp->WrapT);
 114    sampler->wrap_r = gl_wrap_xlate(msamp->WrapR);
 115
 116    sampler->min_img_filter = gl_filter_to_img_filter(msamp->MinFilter);
 117    sampler->min_mip_filter = gl_filter_to_mip_filter(msamp->MinFilter);
 118    sampler->mag_img_filter = gl_filter_to_img_filter(msamp->MagFilter);
 119
 120    if (texobj->Target != GL_TEXTURE_RECTANGLE_ARB)
 121       sampler->normalized_coords = 1;
 122
 123    sampler->lod_bias = msamp->LodBias + tex_unit_lod_bias;
 124    /* Reduce the number of states by allowing only the values that AMD GCN
 125     * can represent. Apps use lod_bias for smooth transitions to bigger mipmap
 126     * levels.
 127     */
 128    sampler->lod_bias = CLAMP(sampler->lod_bias, -16, 16);
 129    sampler->lod_bias = floorf(sampler->lod_bias * 256) / 256;
 130
 131    sampler->min_lod = MAX2(msamp->MinLod, 0.0f);
 132    sampler->max_lod = msamp->MaxLod;
 133    if (sampler->max_lod < sampler->min_lod) {
 134       /* The GL spec doesn't seem to specify what to do in this case.
 135        * Swap the values.
 136        */
 137       float tmp = sampler->max_lod;
 138       sampler->max_lod = sampler->min_lod;
 139       sampler->min_lod = tmp;
 140       assert(sampler->min_lod <= sampler->max_lod);
 141    }
 142
 143    /* Check that only wrap modes using the border color have the first bit
 144     * set.
 145     */
 146    STATIC_ASSERT(PIPE_TEX_WRAP_CLAMP & 0x1);
 147    STATIC_ASSERT(PIPE_TEX_WRAP_CLAMP_TO_BORDER & 0x1);
 148    STATIC_ASSERT(PIPE_TEX_WRAP_MIRROR_CLAMP & 0x1);
 149    STATIC_ASSERT(PIPE_TEX_WRAP_MIRROR_CLAMP_TO_BORDER & 0x1);
 150    STATIC_ASSERT(((PIPE_TEX_WRAP_REPEAT |
 151                    PIPE_TEX_WRAP_CLAMP_TO_EDGE |
 152                    PIPE_TEX_WRAP_MIRROR_REPEAT |
 153                    PIPE_TEX_WRAP_MIRROR_CLAMP_TO_EDGE) & 0x1) == 0);
 154
 155    /* For non-black borders... */
 156    if (/* This is true if wrap modes are using the border color: */
 157        (sampler->wrap_s | sampler->wrap_t | sampler->wrap_r) & 0x1 &&
 158        (msamp->BorderColor.ui[0] ||
 159         msamp->BorderColor.ui[1] ||
 160         msamp->BorderColor.ui[2] ||
 161         msamp->BorderColor.ui[3])) {
 162       const GLboolean is_integer = texobj->_IsIntegerFormat;
 163       GLenum texBaseFormat = _mesa_base_tex_image(texobj)->_BaseFormat;
 164
 165       if (st->apply_texture_swizzle_to_border_color) {
 166          const struct st_texture_object *stobj = st_texture_object_const(texobj);
 167          const struct pipe_sampler_view *sv = NULL;
 168
 169          /* Just search for the first used view. We can do this because the
 170             swizzle is per-texture, not per context. */
 171          /* XXX: clean that up to not use the sampler view at all */
 172          for (unsigned i = 0; i < stobj->num_sampler_views; ++i) {
 173             if (stobj->sampler_views[i].view) {
 174                sv = stobj->sampler_views[i].view;
 175                break;
 176             }
 177          }
 178
 179          if (sv) {
 180             union pipe_color_union tmp;
 181             const unsigned char swz[4] =
 182             {
 183                sv->swizzle_r,
 184                sv->swizzle_g,
 185                sv->swizzle_b,
 186                sv->swizzle_a,
 187             };
 188
 189             st_translate_color(&msamp->BorderColor, &tmp,
 190                                texBaseFormat, is_integer);
 191
 192             util_format_apply_color_swizzle(&sampler->border_color,
 193                                             &tmp, swz, is_integer);
 194          } else {
 195             st_translate_color(&msamp->BorderColor,
 196                                &sampler->border_color,
 197                                texBaseFormat, is_integer);
 198          }
 199       } else {
 200          st_translate_color(&msamp->BorderColor,
 201                             &sampler->border_color,
 202                             texBaseFormat, is_integer);
 203       }
 204    }
 205
 206    sampler->max_anisotropy = (msamp->MaxAnisotropy == 1.0 ?
 207                               0 : (GLuint) msamp->MaxAnisotropy);
 208
 209    /* If sampling a depth texture and using shadow comparison */
 210    if (msamp->CompareMode == GL_COMPARE_R_TO_TEXTURE) {
 211       GLenum texBaseFormat = _mesa_base_tex_image(texobj)->_BaseFormat;
 212
 213       if (texBaseFormat == GL_DEPTH_COMPONENT ||
 214           (texBaseFormat == GL_DEPTH_STENCIL && !texobj->StencilSampling)) {
 215          sampler->compare_mode = PIPE_TEX_COMPARE_R_TO_TEXTURE;
 216          sampler->compare_func = st_compare_func_to_pipe(msamp->CompareFunc);
 217       }
 218    }
 219
 220    /* Only set the seamless cube map texture parameter because the per-context
 221     * enable should be ignored and treated as disabled when using texture
 222     * handles, as specified by ARB_bindless_texture.
 223     */
 224    sampler->seamless_cube_map = msamp->CubeMapSeamless;
 225 }
 226
 227 /**
 228  * Get a pipe_sampler_state object from a texture unit.
 229  */
 230 void
 231 st_convert_sampler_from_unit(const struct st_context *st,
 232                              struct pipe_sampler_state *sampler,
 233                              GLuint texUnit)
 234 {
 235    const struct gl_texture_object *texobj;
 236    struct gl_context *ctx = st->ctx;
 237    const struct gl_sampler_object *msamp;
 238
 239    texobj = ctx->Texture.Unit[texUnit]._Current;
 240    assert(texobj);
 241    assert(texobj->Target != GL_TEXTURE_BUFFER);
 242
 243    msamp = _mesa_get_samplerobj(ctx, texUnit);
 244
 245    st_convert_sampler(st, texobj, msamp, ctx->Texture.Unit[texUnit].LodBias,
 246                       sampler);
 247
 248    sampler->seamless_cube_map |= ctx->Texture.CubeMapSeamless;
 249 }
 250
 251
 252 /**
 253  * Update the gallium driver's sampler state for fragment, vertex or
 254  * geometry shader stage.
 255  */
 256 static void
 257 update_shader_samplers(struct st_context *st,
 258                        enum pipe_shader_type shader_stage,
 259                        const struct gl_program *prog,
 260                        struct pipe_sampler_state *samplers,
 261                        unsigned *out_num_samplers)
 262 {
 263    struct gl_context *ctx = st->ctx;
 264    GLbitfield samplers_used = prog->SamplersUsed;
 265    GLbitfield free_slots = ~prog->SamplersUsed;
 266    GLbitfield external_samplers_used = prog->ExternalSamplersUsed;
 267    unsigned unit, num_samplers;
 268    const struct pipe_sampler_state *states[PIPE_MAX_SAMPLERS];
 269
 270    if (samplers_used == 0x0) {
 271       *out_num_samplers = 0;
 272       return;
 273    }
 274
 275    num_samplers = util_last_bit(samplers_used);
 276
 277    /* loop over sampler units (aka tex image units) */
 278    for (unit = 0; samplers_used; unit++, samplers_used >>= 1) {
 279       struct pipe_sampler_state *sampler = samplers + unit;
 280       unsigned tex_unit = prog->SamplerUnits[unit];
 281
 282       /* Don't update the sampler for TBOs. cso_context will not bind sampler
 283        * states that are NULL.
 284        */
 285       if (samplers_used & 1 &&
 286           ctx->Texture.Unit[tex_unit]._Current->Target != GL_TEXTURE_BUFFER) {
 287          st_convert_sampler_from_unit(st, sampler, tex_unit);
 288          states[unit] = sampler;
 289       } else {
 290          states[unit] = NULL;
 291       }
 292    }
 293
 294    /* For any external samplers with multiplaner YUV, stuff the additional
 295     * sampler states we need at the end.
 296     *
 297     * Just re-use the existing sampler-state from the primary slot.
 298     */
 299    while (unlikely(external_samplers_used)) {
 300       GLuint unit = u_bit_scan(&external_samplers_used);
 301       GLuint extra = 0;
 302       struct st_texture_object *stObj =
 303             st_get_texture_object(st->ctx, prog, unit);
 304       struct pipe_sampler_state *sampler = samplers + unit;
 305
 306       if (!stObj)
 307          continue;
 308
 309       switch (st_get_view_format(stObj)) {
 310       case PIPE_FORMAT_NV12:
 311          /* we need one additional sampler: */
 312          extra = u_bit_scan(&free_slots);
 313          states[extra] = sampler;
 314          break;
 315       case PIPE_FORMAT_IYUV:
 316          /* we need two additional samplers: */
 317          extra = u_bit_scan(&free_slots);
 318          states[extra] = sampler;
 319          extra = u_bit_scan(&free_slots);
 320          states[extra] = sampler;
 321          break;
 322       default:
 323          break;
 324       }
 325
 326       num_samplers = MAX2(num_samplers, extra + 1);
 327    }
 328
 329    cso_set_samplers(st->cso_context, shader_stage, num_samplers, states);
 330    *out_num_samplers = num_samplers;
 331 }
 332
 333
 334 void
 335 st_update_vertex_samplers(struct st_context *st)
 336 {
 337    const struct gl_context *ctx = st->ctx;
 338
 339    update_shader_samplers(st,
 340                           PIPE_SHADER_VERTEX,
 341                           ctx->VertexProgram._Current,
 342                           st->state.samplers[PIPE_SHADER_VERTEX],
 343                           &st->state.num_samplers[PIPE_SHADER_VERTEX]);
 344 }
 345
 346
 347 void
 348 st_update_tessctrl_samplers(struct st_context *st)
 349 {
 350    const struct gl_context *ctx = st->ctx;
 351
 352    if (ctx->TessCtrlProgram._Current) {
 353       update_shader_samplers(st,
 354                              PIPE_SHADER_TESS_CTRL,
 355                              ctx->TessCtrlProgram._Current,
 356                              st->state.samplers[PIPE_SHADER_TESS_CTRL],
 357                              &st->state.num_samplers[PIPE_SHADER_TESS_CTRL]);
 358    }
 359 }
 360
 361
 362 void
 363 st_update_tesseval_samplers(struct st_context *st)
 364 {
 365    const struct gl_context *ctx = st->ctx;
 366
 367    if (ctx->TessEvalProgram._Current) {
 368       update_shader_samplers(st,
 369                              PIPE_SHADER_TESS_EVAL,
 370                              ctx->TessEvalProgram._Current,
 371                              st->state.samplers[PIPE_SHADER_TESS_EVAL],
 372                              &st->state.num_samplers[PIPE_SHADER_TESS_EVAL]);
 373    }
 374 }
 375
 376
 377 void
 378 st_update_geometry_samplers(struct st_context *st)
 379 {
 380    const struct gl_context *ctx = st->ctx;
 381
 382    if (ctx->GeometryProgram._Current) {
 383       update_shader_samplers(st,
 384                              PIPE_SHADER_GEOMETRY,
 385                              ctx->GeometryProgram._Current,
 386                              st->state.samplers[PIPE_SHADER_GEOMETRY],
 387                              &st->state.num_samplers[PIPE_SHADER_GEOMETRY]);
 388    }
 389 }
 390
 391
 392 void
 393 st_update_fragment_samplers(struct st_context *st)
 394 {
 395    const struct gl_context *ctx = st->ctx;
 396
 397    update_shader_samplers(st,
 398                           PIPE_SHADER_FRAGMENT,
 399                           ctx->FragmentProgram._Current,
 400                           st->state.samplers[PIPE_SHADER_FRAGMENT],
 401                           &st->state.num_samplers[PIPE_SHADER_FRAGMENT]);
 402 }
 403
 404
 405 void
 406 st_update_compute_samplers(struct st_context *st)
 407 {
 408    const struct gl_context *ctx = st->ctx;
 409
 410    if (ctx->ComputeProgram._Current) {
 411       update_shader_samplers(st,
 412                              PIPE_SHADER_COMPUTE,
 413                              ctx->ComputeProgram._Current,
 414                              st->state.samplers[PIPE_SHADER_COMPUTE],
 415                              &st->state.num_samplers[PIPE_SHADER_COMPUTE]);
 416    }
 417 }