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    switch (wrap) {
  62    case GL_REPEAT:
  63       return PIPE_TEX_WRAP_REPEAT;
  64    case GL_CLAMP:
  65       return PIPE_TEX_WRAP_CLAMP;
  66    case GL_CLAMP_TO_EDGE:
  67       return PIPE_TEX_WRAP_CLAMP_TO_EDGE;
  68    case GL_CLAMP_TO_BORDER:
  69       return PIPE_TEX_WRAP_CLAMP_TO_BORDER;
  70    case GL_MIRRORED_REPEAT:
  71       return PIPE_TEX_WRAP_MIRROR_REPEAT;
  72    case GL_MIRROR_CLAMP_EXT:
  73       return PIPE_TEX_WRAP_MIRROR_CLAMP;
  74    case GL_MIRROR_CLAMP_TO_EDGE_EXT:
  75       return PIPE_TEX_WRAP_MIRROR_CLAMP_TO_EDGE;
  76    case GL_MIRROR_CLAMP_TO_BORDER_EXT:
  77       return PIPE_TEX_WRAP_MIRROR_CLAMP_TO_BORDER;
  78    default:
  79       assert(0);
  80       return 0;
  81    }
  82 }
  83
  84
  85 static GLuint
  86 gl_filter_to_mip_filter(GLenum filter)
  87 {
  88    switch (filter) {
  89    case GL_NEAREST:
  90    case GL_LINEAR:
  91       return PIPE_TEX_MIPFILTER_NONE;
  92
  93    case GL_NEAREST_MIPMAP_NEAREST:
  94    case GL_LINEAR_MIPMAP_NEAREST:
  95       return PIPE_TEX_MIPFILTER_NEAREST;
  96
  97    case GL_NEAREST_MIPMAP_LINEAR:
  98    case GL_LINEAR_MIPMAP_LINEAR:
  99       return PIPE_TEX_MIPFILTER_LINEAR;
 100
 101    default:
 102       assert(0);
 103       return PIPE_TEX_MIPFILTER_NONE;
 104    }
 105 }
 106
 107
 108 static GLuint
 109 gl_filter_to_img_filter(GLenum filter)
 110 {
 111    switch (filter) {
 112    case GL_NEAREST:
 113    case GL_NEAREST_MIPMAP_NEAREST:
 114    case GL_NEAREST_MIPMAP_LINEAR:
 115       return PIPE_TEX_FILTER_NEAREST;
 116
 117    case GL_LINEAR:
 118    case GL_LINEAR_MIPMAP_NEAREST:
 119    case GL_LINEAR_MIPMAP_LINEAR:
 120       return PIPE_TEX_FILTER_LINEAR;
 121
 122    default:
 123       assert(0);
 124       return PIPE_TEX_FILTER_NEAREST;
 125    }
 126 }
 127
 128
 129 static void
 130 convert_sampler(struct st_context *st,
 131                 struct pipe_sampler_state *sampler,
 132                 GLuint texUnit)
 133 {
 134    const struct gl_texture_object *texobj;
 135    struct gl_context *ctx = st->ctx;
 136    const struct gl_sampler_object *msamp;
 137    GLenum texBaseFormat;
 138
 139    texobj = ctx->Texture.Unit[texUnit]._Current;
 140    if (!texobj) {
 141       texobj = _mesa_get_fallback_texture(ctx, TEXTURE_2D_INDEX);
 142       msamp = &texobj->Sampler;
 143    } else {
 144       msamp = _mesa_get_samplerobj(ctx, texUnit);
 145    }
 146
 147    texBaseFormat = _mesa_texture_base_format(texobj);
 148
 149    memset(sampler, 0, sizeof(*sampler));
 150    sampler->wrap_s = gl_wrap_xlate(msamp->WrapS);
 151    sampler->wrap_t = gl_wrap_xlate(msamp->WrapT);
 152    sampler->wrap_r = gl_wrap_xlate(msamp->WrapR);
 153
 154    sampler->min_img_filter = gl_filter_to_img_filter(msamp->MinFilter);
 155    sampler->min_mip_filter = gl_filter_to_mip_filter(msamp->MinFilter);
 156    sampler->mag_img_filter = gl_filter_to_img_filter(msamp->MagFilter);
 157
 158    if (texobj->Target != GL_TEXTURE_RECTANGLE_ARB)
 159       sampler->normalized_coords = 1;
 160
 161    sampler->lod_bias = ctx->Texture.Unit[texUnit].LodBias + msamp->LodBias;
 162    /* Reduce the number of states by allowing only the values that AMD GCN
 163     * can represent. Apps use lod_bias for smooth transitions to bigger mipmap
 164     * levels.
 165     */
 166    sampler->lod_bias = CLAMP(sampler->lod_bias, -16, 16);
 167    sampler->lod_bias = floorf(sampler->lod_bias * 256) / 256;
 168
 169    sampler->min_lod = MAX2(msamp->MinLod, 0.0f);
 170    sampler->max_lod = msamp->MaxLod;
 171    if (sampler->max_lod < sampler->min_lod) {
 172       /* The GL spec doesn't seem to specify what to do in this case.
 173        * Swap the values.
 174        */
 175       float tmp = sampler->max_lod;
 176       sampler->max_lod = sampler->min_lod;
 177       sampler->min_lod = tmp;
 178       assert(sampler->min_lod <= sampler->max_lod);
 179    }
 180
 181    /* For non-black borders... */
 182    if (msamp->BorderColor.ui[0] ||
 183        msamp->BorderColor.ui[1] ||
 184        msamp->BorderColor.ui[2] ||
 185        msamp->BorderColor.ui[3]) {
 186       const struct st_texture_object *stobj = st_texture_object_const(texobj);
 187       const GLboolean is_integer = texobj->_IsIntegerFormat;
 188       const struct pipe_sampler_view *sv = NULL;
 189       union pipe_color_union border_color;
 190       GLuint i;
 191
 192       /* Just search for the first used view. We can do this because the
 193          swizzle is per-texture, not per context. */
 194       /* XXX: clean that up to not use the sampler view at all */
 195       for (i = 0; i < stobj->num_sampler_views; ++i) {
 196          if (stobj->sampler_views[i]) {
 197             sv = stobj->sampler_views[i];
 198             break;
 199          }
 200       }
 201
 202       if (st->apply_texture_swizzle_to_border_color && sv) {
 203          const unsigned char swz[4] =
 204          {
 205             sv->swizzle_r,
 206             sv->swizzle_g,
 207             sv->swizzle_b,
 208             sv->swizzle_a,
 209          };
 210
 211          st_translate_color(&msamp->BorderColor,
 212                             &border_color,
 213                             texBaseFormat, is_integer);
 214
 215          util_format_apply_color_swizzle(&sampler->border_color,
 216                                          &border_color, swz, is_integer);
 217       } else {
 218          st_translate_color(&msamp->BorderColor,
 219                             &sampler->border_color,
 220                             texBaseFormat, is_integer);
 221       }
 222    }
 223
 224    sampler->max_anisotropy = (msamp->MaxAnisotropy == 1.0 ?
 225                               0 : (GLuint) msamp->MaxAnisotropy);
 226
 227    /* If sampling a depth texture and using shadow comparison */
 228    if ((texBaseFormat == GL_DEPTH_COMPONENT ||
 229         (texBaseFormat == GL_DEPTH_STENCIL && !texobj->StencilSampling)) &&
 230        msamp->CompareMode == GL_COMPARE_R_TO_TEXTURE) {
 231       sampler->compare_mode = PIPE_TEX_COMPARE_R_TO_TEXTURE;
 232       sampler->compare_func = st_compare_func_to_pipe(msamp->CompareFunc);
 233    }
 234
 235    sampler->seamless_cube_map =
 236       ctx->Texture.CubeMapSeamless || msamp->CubeMapSeamless;
 237 }
 238
 239
 240 /**
 241  * Update the gallium driver's sampler state for fragment, vertex or
 242  * geometry shader stage.
 243  */
 244 static void
 245 update_shader_samplers(struct st_context *st,
 246                        enum pipe_shader_type shader_stage,
 247                        const struct gl_program *prog,
 248                        unsigned max_units,
 249                        struct pipe_sampler_state *samplers,
 250                        unsigned *num_samplers)
 251 {
 252    GLbitfield samplers_used = prog->SamplersUsed;
 253    GLbitfield free_slots = ~prog->SamplersUsed;
 254    GLbitfield external_samplers_used = prog->ExternalSamplersUsed;
 255    GLuint unit;
 256    const GLuint old_max = *num_samplers;
 257    const struct pipe_sampler_state *states[PIPE_MAX_SAMPLERS];
 258
 259    if (*num_samplers == 0 && samplers_used == 0x0)
 260       return;
 261
 262    *num_samplers = 0;
 263
 264    /* loop over sampler units (aka tex image units) */
 265    for (unit = 0; unit < max_units; unit++, samplers_used >>= 1) {
 266       struct pipe_sampler_state *sampler = samplers + unit;
 267
 268       if (samplers_used & 1) {
 269          const GLuint texUnit = prog->SamplerUnits[unit];
 270
 271          convert_sampler(st, sampler, texUnit);
 272          states[unit] = sampler;
 273          *num_samplers = unit + 1;
 274       }
 275       else if (samplers_used != 0 || unit < old_max) {
 276          states[unit] = NULL;
 277       }
 278       else {
 279          /* if we've reset all the old samplers and we have no more new ones */
 280          break;
 281       }
 282    }
 283
 284    /* For any external samplers with multiplaner YUV, stuff the additional
 285     * sampler states we need at the end.
 286     *
 287     * Just re-use the existing sampler-state from the primary slot.
 288     */
 289    while (unlikely(external_samplers_used)) {
 290       GLuint unit = u_bit_scan(&external_samplers_used);
 291       GLuint extra = 0;
 292       struct st_texture_object *stObj =
 293             st_get_texture_object(st->ctx, prog, unit);
 294       struct pipe_sampler_state *sampler = samplers + unit;
 295
 296       if (!stObj)
 297          continue;
 298
 299       switch (st_get_view_format(stObj)) {
 300       case PIPE_FORMAT_NV12:
 301          /* we need one additional sampler: */
 302          extra = u_bit_scan(&free_slots);
 303          states[extra] = sampler;
 304          break;
 305       case PIPE_FORMAT_IYUV:
 306          /* we need two additional samplers: */
 307          extra = u_bit_scan(&free_slots);
 308          states[extra] = sampler;
 309          extra = u_bit_scan(&free_slots);
 310          states[extra] = sampler;
 311          break;
 312       default:
 313          break;
 314       }
 315
 316       *num_samplers = MAX2(*num_samplers, extra + 1);
 317    }
 318
 319    cso_set_samplers(st->cso_context, shader_stage, *num_samplers, states);
 320 }
 321
 322
 323 static void
 324 update_samplers(struct st_context *st)
 325 {
 326    const struct gl_context *ctx = st->ctx;
 327
 328    update_shader_samplers(st,
 329                           PIPE_SHADER_FRAGMENT,
 330                           ctx->FragmentProgram._Current,
 331                           ctx->Const.Program[MESA_SHADER_FRAGMENT].MaxTextureImageUnits,
 332                           st->state.samplers[PIPE_SHADER_FRAGMENT],
 333                           &st->state.num_samplers[PIPE_SHADER_FRAGMENT]);
 334
 335    update_shader_samplers(st,
 336                           PIPE_SHADER_VERTEX,
 337                           ctx->VertexProgram._Current,
 338                           ctx->Const.Program[MESA_SHADER_VERTEX].MaxTextureImageUnits,
 339                           st->state.samplers[PIPE_SHADER_VERTEX],
 340                           &st->state.num_samplers[PIPE_SHADER_VERTEX]);
 341
 342    if (ctx->GeometryProgram._Current) {
 343       update_shader_samplers(st,
 344                              PIPE_SHADER_GEOMETRY,
 345                              ctx->GeometryProgram._Current,
 346                              ctx->Const.Program[MESA_SHADER_GEOMETRY].MaxTextureImageUnits,
 347                              st->state.samplers[PIPE_SHADER_GEOMETRY],
 348                              &st->state.num_samplers[PIPE_SHADER_GEOMETRY]);
 349    }
 350    if (ctx->TessCtrlProgram._Current) {
 351       update_shader_samplers(st,
 352                              PIPE_SHADER_TESS_CTRL,
 353                              ctx->TessCtrlProgram._Current,
 354                              ctx->Const.Program[MESA_SHADER_TESS_CTRL].MaxTextureImageUnits,
 355                              st->state.samplers[PIPE_SHADER_TESS_CTRL],
 356                              &st->state.num_samplers[PIPE_SHADER_TESS_CTRL]);
 357    }
 358    if (ctx->TessEvalProgram._Current) {
 359       update_shader_samplers(st,
 360                              PIPE_SHADER_TESS_EVAL,
 361                              ctx->TessEvalProgram._Current,
 362                              ctx->Const.Program[MESA_SHADER_TESS_EVAL].MaxTextureImageUnits,
 363                              st->state.samplers[PIPE_SHADER_TESS_EVAL],
 364                              &st->state.num_samplers[PIPE_SHADER_TESS_EVAL]);
 365    }
 366    if (ctx->ComputeProgram._Current) {
 367       update_shader_samplers(st,
 368                              PIPE_SHADER_COMPUTE,
 369                              ctx->ComputeProgram._Current,
 370                              ctx->Const.Program[MESA_SHADER_COMPUTE].MaxTextureImageUnits,
 371                              st->state.samplers[PIPE_SHADER_COMPUTE],
 372                              &st->state.num_samplers[PIPE_SHADER_COMPUTE]);
 373    }
 374 }
 375
 376
 377 const struct st_tracked_state st_update_sampler = {
 378    update_samplers                                      /* update */
 379 };