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