src/mesa/drivers/dri/i965/brw_wm_sampler_state.c

   1 /*
   2  Copyright (C) Intel Corp.  2006.  All Rights Reserved.
   3  Intel funded Tungsten Graphics (http://www.tungstengraphics.com) to
   4  develop this 3D driver.
   5
   6  Permission is hereby granted, free of charge, to any person obtaining
   7  a 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, sublicense, 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
  16  portions of the Software.
  17
  18  THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
  19  EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
  20  MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
  21  IN NO EVENT SHALL THE COPYRIGHT OWNER(S) AND/OR ITS SUPPLIERS BE
  22  LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
  23  OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
  24  WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
  25
  26  **********************************************************************/
  27  /*
  28   * Authors:
  29   *   Keith Whitwell <keith@tungstengraphics.com>
  30   */
  31
  32
  33 #include "brw_context.h"
  34 #include "brw_state.h"
  35 #include "brw_defines.h"
  36
  37 #include "main/macros.h"
  38 #include "main/samplerobj.h"
  39
  40
  41 /* Samplers aren't strictly wm state from the hardware's perspective,
  42  * but that is the only situation in which we use them in this driver.
  43  */
  44
  45
  46
  47 uint32_t
  48 translate_wrap_mode(GLenum wrap, bool using_nearest)
  49 {
  50    switch( wrap ) {
  51    case GL_REPEAT:
  52       return BRW_TEXCOORDMODE_WRAP;
  53    case GL_CLAMP:
  54       /* GL_CLAMP is the weird mode where coordinates are clamped to
  55        * [0.0, 1.0], so linear filtering of coordinates outside of
  56        * [0.0, 1.0] give you half edge texel value and half border
  57        * color.  The fragment shader will clamp the coordinates, and
  58        * we set clamp_border here, which gets the result desired.  We
  59        * just use clamp(_to_edge) for nearest, because for nearest
  60        * clamping to 1.0 gives border color instead of the desired
  61        * edge texels.
  62        */
  63       if (using_nearest)
  64          return BRW_TEXCOORDMODE_CLAMP;
  65       else
  66          return BRW_TEXCOORDMODE_CLAMP_BORDER;
  67    case GL_CLAMP_TO_EDGE:
  68       return BRW_TEXCOORDMODE_CLAMP;
  69    case GL_CLAMP_TO_BORDER:
  70       return BRW_TEXCOORDMODE_CLAMP_BORDER;
  71    case GL_MIRRORED_REPEAT:
  72       return BRW_TEXCOORDMODE_MIRROR;
  73    default:
  74       return BRW_TEXCOORDMODE_WRAP;
  75    }
  76 }
  77
  78 /**
  79  * Upload SAMPLER_BORDER_COLOR_STATE.
  80  */
  81 void
  82 upload_default_color(struct brw_context *brw, struct gl_sampler_object *sampler,
  83                      int unit, int ss_index)
  84 {
  85    struct intel_context *intel = &brw->intel;
  86    struct gl_context *ctx = &intel->ctx;
  87    struct gl_texture_unit *texUnit = &ctx->Texture.Unit[unit];
  88    struct gl_texture_object *texObj = texUnit->_Current;
  89    struct gl_texture_image *firstImage = texObj->Image[0][texObj->BaseLevel];
  90    float color[4];
  91
  92    if (firstImage->_BaseFormat == GL_DEPTH_COMPONENT) {
  93       /* GL specs that border color for depth textures is taken from the
  94        * R channel, while the hardware uses A.  Spam R into all the
  95        * channels for safety.
  96        */
  97       color[0] = sampler->BorderColor.f[0];
  98       color[1] = sampler->BorderColor.f[0];
  99       color[2] = sampler->BorderColor.f[0];
 100       color[3] = sampler->BorderColor.f[0];
 101    } else {
 102       color[0] = sampler->BorderColor.f[0];
 103       color[1] = sampler->BorderColor.f[1];
 104       color[2] = sampler->BorderColor.f[2];
 105       color[3] = sampler->BorderColor.f[3];
 106    }
 107
 108    if (intel->gen == 5 || intel->gen == 6) {
 109       struct gen5_sampler_default_color *sdc;
 110
 111       sdc = brw_state_batch(brw, AUB_TRACE_SAMPLER_DEFAULT_COLOR,
 112                             sizeof(*sdc), 32, &brw->wm.sdc_offset[ss_index]);
 113
 114       memset(sdc, 0, sizeof(*sdc));
 115
 116       UNCLAMPED_FLOAT_TO_UBYTE(sdc->ub[0], color[0]);
 117       UNCLAMPED_FLOAT_TO_UBYTE(sdc->ub[1], color[1]);
 118       UNCLAMPED_FLOAT_TO_UBYTE(sdc->ub[2], color[2]);
 119       UNCLAMPED_FLOAT_TO_UBYTE(sdc->ub[3], color[3]);
 120
 121       UNCLAMPED_FLOAT_TO_USHORT(sdc->us[0], color[0]);
 122       UNCLAMPED_FLOAT_TO_USHORT(sdc->us[1], color[1]);
 123       UNCLAMPED_FLOAT_TO_USHORT(sdc->us[2], color[2]);
 124       UNCLAMPED_FLOAT_TO_USHORT(sdc->us[3], color[3]);
 125
 126       UNCLAMPED_FLOAT_TO_SHORT(sdc->s[0], color[0]);
 127       UNCLAMPED_FLOAT_TO_SHORT(sdc->s[1], color[1]);
 128       UNCLAMPED_FLOAT_TO_SHORT(sdc->s[2], color[2]);
 129       UNCLAMPED_FLOAT_TO_SHORT(sdc->s[3], color[3]);
 130
 131       sdc->hf[0] = _mesa_float_to_half(color[0]);
 132       sdc->hf[1] = _mesa_float_to_half(color[1]);
 133       sdc->hf[2] = _mesa_float_to_half(color[2]);
 134       sdc->hf[3] = _mesa_float_to_half(color[3]);
 135
 136       sdc->b[0] = sdc->s[0] >> 8;
 137       sdc->b[1] = sdc->s[1] >> 8;
 138       sdc->b[2] = sdc->s[2] >> 8;
 139       sdc->b[3] = sdc->s[3] >> 8;
 140
 141       sdc->f[0] = color[0];
 142       sdc->f[1] = color[1];
 143       sdc->f[2] = color[2];
 144       sdc->f[3] = color[3];
 145    } else {
 146       struct brw_sampler_default_color *sdc;
 147
 148       sdc = brw_state_batch(brw, AUB_TRACE_SAMPLER_DEFAULT_COLOR,
 149                             sizeof(*sdc), 32, &brw->wm.sdc_offset[ss_index]);
 150
 151       COPY_4V(sdc->color, color);
 152    }
 153 }
 154
 155 /**
 156  * Sets the sampler state for a single unit based off of the sampler key
 157  * entry.
 158  */
 159 static void brw_update_sampler_state(struct brw_context *brw,
 160                                      int unit,
 161                                      int ss_index,
 162                                      struct brw_sampler_state *sampler)
 163 {
 164    struct intel_context *intel = &brw->intel;
 165    struct gl_context *ctx = &intel->ctx;
 166    struct gl_texture_unit *texUnit = &ctx->Texture.Unit[unit];
 167    struct gl_texture_object *texObj = texUnit->_Current;
 168    struct gl_sampler_object *gl_sampler = _mesa_get_samplerobj(ctx, unit);
 169    bool using_nearest = false;
 170
 171    /* These don't use samplers at all. */
 172    if (texObj->Target == GL_TEXTURE_BUFFER)
 173       return;
 174
 175    switch (gl_sampler->MinFilter) {
 176    case GL_NEAREST:
 177       sampler->ss0.min_filter = BRW_MAPFILTER_NEAREST;
 178       sampler->ss0.mip_filter = BRW_MIPFILTER_NONE;
 179       using_nearest = true;
 180       break;
 181    case GL_LINEAR:
 182       sampler->ss0.min_filter = BRW_MAPFILTER_LINEAR;
 183       sampler->ss0.mip_filter = BRW_MIPFILTER_NONE;
 184       break;
 185    case GL_NEAREST_MIPMAP_NEAREST:
 186       sampler->ss0.min_filter = BRW_MAPFILTER_NEAREST;
 187       sampler->ss0.mip_filter = BRW_MIPFILTER_NEAREST;
 188       break;
 189    case GL_LINEAR_MIPMAP_NEAREST:
 190       sampler->ss0.min_filter = BRW_MAPFILTER_LINEAR;
 191       sampler->ss0.mip_filter = BRW_MIPFILTER_NEAREST;
 192       break;
 193    case GL_NEAREST_MIPMAP_LINEAR:
 194       sampler->ss0.min_filter = BRW_MAPFILTER_NEAREST;
 195       sampler->ss0.mip_filter = BRW_MIPFILTER_LINEAR;
 196       break;
 197    case GL_LINEAR_MIPMAP_LINEAR:
 198       sampler->ss0.min_filter = BRW_MAPFILTER_LINEAR;
 199       sampler->ss0.mip_filter = BRW_MIPFILTER_LINEAR;
 200       break;
 201    default:
 202       break;
 203    }
 204
 205    /* Set Anisotropy:
 206     */
 207    if (gl_sampler->MaxAnisotropy > 1.0) {
 208       sampler->ss0.min_filter = BRW_MAPFILTER_ANISOTROPIC;
 209       sampler->ss0.mag_filter = BRW_MAPFILTER_ANISOTROPIC;
 210
 211       if (gl_sampler->MaxAnisotropy > 2.0) {
 212          sampler->ss3.max_aniso = MIN2((gl_sampler->MaxAnisotropy - 2) / 2,
 213                                        BRW_ANISORATIO_16);
 214       }
 215    }
 216    else {
 217       switch (gl_sampler->MagFilter) {
 218       case GL_NEAREST:
 219          sampler->ss0.mag_filter = BRW_MAPFILTER_NEAREST;
 220          using_nearest = true;
 221          break;
 222       case GL_LINEAR:
 223          sampler->ss0.mag_filter = BRW_MAPFILTER_LINEAR;
 224          break;
 225       default:
 226          break;
 227       }
 228    }
 229
 230    sampler->ss1.r_wrap_mode = translate_wrap_mode(gl_sampler->WrapR,
 231                                                   using_nearest);
 232    sampler->ss1.s_wrap_mode = translate_wrap_mode(gl_sampler->WrapS,
 233                                                   using_nearest);
 234    sampler->ss1.t_wrap_mode = translate_wrap_mode(gl_sampler->WrapT,
 235                                                   using_nearest);
 236
 237    if (intel->gen >= 6 &&
 238        sampler->ss0.min_filter != sampler->ss0.mag_filter)
 239         sampler->ss0.min_mag_neq = 1;
 240
 241    /* Cube-maps on 965 and later must use the same wrap mode for all 3
 242     * coordinate dimensions.  Futher, only CUBE and CLAMP are valid.
 243     */
 244    if (texObj->Target == GL_TEXTURE_CUBE_MAP) {
 245       if (ctx->Texture.CubeMapSeamless &&
 246           (gl_sampler->MinFilter != GL_NEAREST ||
 247            gl_sampler->MagFilter != GL_NEAREST)) {
 248          sampler->ss1.r_wrap_mode = BRW_TEXCOORDMODE_CUBE;
 249          sampler->ss1.s_wrap_mode = BRW_TEXCOORDMODE_CUBE;
 250          sampler->ss1.t_wrap_mode = BRW_TEXCOORDMODE_CUBE;
 251       } else {
 252          sampler->ss1.r_wrap_mode = BRW_TEXCOORDMODE_CLAMP;
 253          sampler->ss1.s_wrap_mode = BRW_TEXCOORDMODE_CLAMP;
 254          sampler->ss1.t_wrap_mode = BRW_TEXCOORDMODE_CLAMP;
 255       }
 256    } else if (texObj->Target == GL_TEXTURE_1D) {
 257       /* There's a bug in 1D texture sampling - it actually pays
 258        * attention to the wrap_t value, though it should not.
 259        * Override the wrap_t value here to GL_REPEAT to keep
 260        * any nonexistent border pixels from floating in.
 261        */
 262       sampler->ss1.t_wrap_mode = BRW_TEXCOORDMODE_WRAP;
 263    }
 264
 265
 266    /* Set shadow function:
 267     */
 268    if (gl_sampler->CompareMode == GL_COMPARE_R_TO_TEXTURE_ARB) {
 269       /* Shadowing is "enabled" by emitting a particular sampler
 270        * message (sample_c).  So need to recompile WM program when
 271        * shadow comparison is enabled on each/any texture unit.
 272        */
 273       sampler->ss0.shadow_function =
 274          intel_translate_shadow_compare_func(gl_sampler->CompareFunc);
 275    }
 276
 277    /* Set LOD bias:
 278     */
 279    sampler->ss0.lod_bias = S_FIXED(CLAMP(texUnit->LodBias +
 280                                          gl_sampler->LodBias, -16, 15), 6);
 281
 282    sampler->ss0.lod_preclamp = 1; /* OpenGL mode */
 283    sampler->ss0.default_color_mode = 0; /* OpenGL/DX10 mode */
 284
 285    /* Set BaseMipLevel, MaxLOD, MinLOD:
 286     *
 287     * XXX: I don't think that using firstLevel, lastLevel works,
 288     * because we always setup the surface state as if firstLevel ==
 289     * level zero.  Probably have to subtract firstLevel from each of
 290     * these:
 291     */
 292    sampler->ss0.base_level = U_FIXED(0, 1);
 293
 294    sampler->ss1.max_lod = U_FIXED(CLAMP(gl_sampler->MaxLod, 0, 13), 6);
 295    sampler->ss1.min_lod = U_FIXED(CLAMP(gl_sampler->MinLod, 0, 13), 6);
 296
 297    /* On Gen6+, the sampler can handle non-normalized texture
 298     * rectangle coordinates natively
 299     */
 300    if (intel->gen >= 6 && texObj->Target == GL_TEXTURE_RECTANGLE) {
 301       sampler->ss3.non_normalized_coord = 1;
 302    }
 303
 304    upload_default_color(brw, gl_sampler, unit, ss_index);
 305
 306    if (intel->gen >= 6) {
 307       sampler->ss2.default_color_pointer = brw->wm.sdc_offset[ss_index] >> 5;
 308    } else {
 309       /* reloc */
 310       sampler->ss2.default_color_pointer = (intel->batch.bo->offset +
 311                                             brw->wm.sdc_offset[ss_index]) >> 5;
 312
 313       drm_intel_bo_emit_reloc(intel->batch.bo,
 314                               brw->sampler.offset +
 315                               ss_index * sizeof(struct brw_sampler_state) +
 316                               offsetof(struct brw_sampler_state, ss2),
 317                               intel->batch.bo, brw->wm.sdc_offset[ss_index],
 318                               I915_GEM_DOMAIN_SAMPLER, 0);
 319    }
 320
 321    if (sampler->ss0.min_filter != BRW_MAPFILTER_NEAREST)
 322       sampler->ss3.address_round |= BRW_ADDRESS_ROUNDING_ENABLE_U_MIN |
 323                                     BRW_ADDRESS_ROUNDING_ENABLE_V_MIN |
 324                                     BRW_ADDRESS_ROUNDING_ENABLE_R_MIN;
 325    if (sampler->ss0.mag_filter != BRW_MAPFILTER_NEAREST)
 326       sampler->ss3.address_round |= BRW_ADDRESS_ROUNDING_ENABLE_U_MAG |
 327                                     BRW_ADDRESS_ROUNDING_ENABLE_V_MAG |
 328                                     BRW_ADDRESS_ROUNDING_ENABLE_R_MAG;
 329 }
 330
 331
 332 static void
 333 brw_upload_samplers(struct brw_context *brw)
 334 {
 335    struct gl_context *ctx = &brw->intel.ctx;
 336    struct brw_sampler_state *samplers;
 337    int i;
 338
 339    brw->sampler.count = 0;
 340    for (i = 0; i < BRW_MAX_TEX_UNIT; i++) {
 341       if (ctx->Texture.Unit[i]._ReallyEnabled)
 342          brw->sampler.count = i + 1;
 343    }
 344
 345    if (brw->sampler.count == 0)
 346       return;
 347
 348    samplers = brw_state_batch(brw, AUB_TRACE_SAMPLER_STATE,
 349                               brw->sampler.count * sizeof(*samplers),
 350                               32, &brw->sampler.offset);
 351    memset(samplers, 0, brw->sampler.count * sizeof(*samplers));
 352
 353    for (i = 0; i < brw->sampler.count; i++) {
 354       if (ctx->Texture.Unit[i]._ReallyEnabled)
 355          brw_update_sampler_state(brw, i, i, &samplers[i]);
 356    }
 357
 358    brw->state.dirty.cache |= CACHE_NEW_SAMPLER;
 359 }
 360
 361 const struct brw_tracked_state brw_samplers = {
 362    .dirty = {
 363       .mesa = _NEW_TEXTURE,
 364       .brw = BRW_NEW_BATCH,
 365       .cache = 0
 366    },
 367    .emit = brw_upload_samplers,
 368 };
 369
 370