src/mesa/drivers/dri/i965/gen7_sampler_state.c

   1 /*
   2  * Copyright © 2011 Intel Corporation
   3  *
   4  * Permission is hereby granted, free of charge, to any person obtaining a
   5  * copy of this software and associated documentation files (the "Software"),
   6  * to deal in the Software without restriction, including without limitation
   7  * the rights to use, copy, modify, merge, publish, distribute, sublicense,
   8  * and/or sell copies of the Software, and to permit persons to whom the
   9  * Software is furnished to do so, subject to the following conditions:
  10  *
  11  * The above copyright notice and this permission notice (including the next
  12  * paragraph) shall be included in all copies or substantial portions of the
  13  * Software.
  14  *
  15  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
  16  * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
  17  * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
  18  * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
  19  * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
  20  * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS
  21  * IN THE SOFTWARE.
  22  */
  23
  24 #include "brw_context.h"
  25 #include "brw_state.h"
  26 #include "brw_defines.h"
  27 #include "intel_batchbuffer.h"
  28
  29 #include "main/macros.h"
  30 #include "main/samplerobj.h"
  31
  32 /**
  33  * Sets the sampler state for a single unit.
  34  */
  35 static void
  36 gen7_update_sampler_state(struct brw_context *brw, int unit, int ss_index,
  37                           struct gen7_sampler_state *sampler,
  38                           uint32_t *sdc_offset)
  39 {
  40    struct gl_context *ctx = &brw->ctx;
  41    struct gl_texture_unit *texUnit = &ctx->Texture.Unit[unit];
  42    struct gl_texture_object *texObj = texUnit->_Current;
  43    struct gl_sampler_object *gl_sampler = _mesa_get_samplerobj(ctx, unit);
  44    bool using_nearest = false;
  45
  46    /* These don't use samplers at all. */
  47    if (texObj->Target == GL_TEXTURE_BUFFER)
  48       return;
  49
  50    switch (gl_sampler->MinFilter) {
  51    case GL_NEAREST:
  52       sampler->ss0.min_filter = BRW_MAPFILTER_NEAREST;
  53       sampler->ss0.mip_filter = BRW_MIPFILTER_NONE;
  54       using_nearest = true;
  55       break;
  56    case GL_LINEAR:
  57       sampler->ss0.min_filter = BRW_MAPFILTER_LINEAR;
  58       sampler->ss0.mip_filter = BRW_MIPFILTER_NONE;
  59       break;
  60    case GL_NEAREST_MIPMAP_NEAREST:
  61       sampler->ss0.min_filter = BRW_MAPFILTER_NEAREST;
  62       sampler->ss0.mip_filter = BRW_MIPFILTER_NEAREST;
  63       break;
  64    case GL_LINEAR_MIPMAP_NEAREST:
  65       sampler->ss0.min_filter = BRW_MAPFILTER_LINEAR;
  66       sampler->ss0.mip_filter = BRW_MIPFILTER_NEAREST;
  67       break;
  68    case GL_NEAREST_MIPMAP_LINEAR:
  69       sampler->ss0.min_filter = BRW_MAPFILTER_NEAREST;
  70       sampler->ss0.mip_filter = BRW_MIPFILTER_LINEAR;
  71       break;
  72    case GL_LINEAR_MIPMAP_LINEAR:
  73       sampler->ss0.min_filter = BRW_MAPFILTER_LINEAR;
  74       sampler->ss0.mip_filter = BRW_MIPFILTER_LINEAR;
  75       break;
  76    default:
  77       break;
  78    }
  79
  80    /* Set Anisotropy: */
  81    if (gl_sampler->MaxAnisotropy > 1.0) {
  82       sampler->ss0.min_filter = BRW_MAPFILTER_ANISOTROPIC;
  83       sampler->ss0.mag_filter = BRW_MAPFILTER_ANISOTROPIC;
  84
  85       if (gl_sampler->MaxAnisotropy > 2.0) {
  86          sampler->ss3.max_aniso = MIN2((gl_sampler->MaxAnisotropy - 2) / 2,
  87                                        BRW_ANISORATIO_16);
  88       }
  89    }
  90    else {
  91       switch (gl_sampler->MagFilter) {
  92       case GL_NEAREST:
  93          sampler->ss0.mag_filter = BRW_MAPFILTER_NEAREST;
  94          using_nearest = true;
  95          break;
  96       case GL_LINEAR:
  97          sampler->ss0.mag_filter = BRW_MAPFILTER_LINEAR;
  98          break;
  99       default:
 100          break;
 101       }
 102    }
 103
 104    sampler->ss3.r_wrap_mode = translate_wrap_mode(gl_sampler->WrapR,
 105                                                   using_nearest);
 106    sampler->ss3.s_wrap_mode = translate_wrap_mode(gl_sampler->WrapS,
 107                                                   using_nearest);
 108    sampler->ss3.t_wrap_mode = translate_wrap_mode(gl_sampler->WrapT,
 109                                                   using_nearest);
 110
 111    /* Cube-maps on 965 and later must use the same wrap mode for all 3
 112     * coordinate dimensions.  Futher, only CUBE and CLAMP are valid.
 113     */
 114    if (texObj->Target == GL_TEXTURE_CUBE_MAP ||
 115        texObj->Target == GL_TEXTURE_CUBE_MAP_ARRAY) {
 116       if (ctx->Texture.CubeMapSeamless &&
 117           (gl_sampler->MinFilter != GL_NEAREST ||
 118            gl_sampler->MagFilter != GL_NEAREST)) {
 119          sampler->ss3.r_wrap_mode = BRW_TEXCOORDMODE_CUBE;
 120          sampler->ss3.s_wrap_mode = BRW_TEXCOORDMODE_CUBE;
 121          sampler->ss3.t_wrap_mode = BRW_TEXCOORDMODE_CUBE;
 122       } else {
 123          sampler->ss3.r_wrap_mode = BRW_TEXCOORDMODE_CLAMP;
 124          sampler->ss3.s_wrap_mode = BRW_TEXCOORDMODE_CLAMP;
 125          sampler->ss3.t_wrap_mode = BRW_TEXCOORDMODE_CLAMP;
 126       }
 127    } else if (texObj->Target == GL_TEXTURE_1D) {
 128       /* There's a bug in 1D texture sampling - it actually pays
 129        * attention to the wrap_t value, though it should not.
 130        * Override the wrap_t value here to GL_REPEAT to keep
 131        * any nonexistent border pixels from floating in.
 132        */
 133       sampler->ss3.t_wrap_mode = BRW_TEXCOORDMODE_WRAP;
 134    }
 135
 136    /* Set shadow function: */
 137    if (gl_sampler->CompareMode == GL_COMPARE_R_TO_TEXTURE_ARB) {
 138       /* Shadowing is "enabled" by emitting a particular sampler
 139        * message (sample_c).  So need to recompile WM program when
 140        * shadow comparison is enabled on each/any texture unit.
 141        */
 142       sampler->ss1.shadow_function =
 143          intel_translate_shadow_compare_func(gl_sampler->CompareFunc);
 144    }
 145
 146    /* Set LOD bias: */
 147    sampler->ss0.lod_bias = S_FIXED(CLAMP(texUnit->LodBias +
 148                                          gl_sampler->LodBias, -16, 15), 8);
 149
 150    sampler->ss0.lod_preclamp = 1; /* OpenGL mode */
 151    sampler->ss0.default_color_mode = 0; /* OpenGL/DX10 mode */
 152
 153    /* Set BaseMipLevel, MaxLOD, MinLOD:
 154     *
 155     * XXX: I don't think that using firstLevel, lastLevel works,
 156     * because we always setup the surface state as if firstLevel ==
 157     * level zero.  Probably have to subtract firstLevel from each of
 158     * these:
 159     */
 160    sampler->ss0.base_level = U_FIXED(0, 1);
 161
 162    sampler->ss1.max_lod = U_FIXED(CLAMP(gl_sampler->MaxLod, 0, 13), 8);
 163    sampler->ss1.min_lod = U_FIXED(CLAMP(gl_sampler->MinLod, 0, 13), 8);
 164
 165    /* The sampler can handle non-normalized texture rectangle coordinates
 166     * natively
 167     */
 168    if (texObj->Target == GL_TEXTURE_RECTANGLE) {
 169       sampler->ss3.non_normalized_coord = 1;
 170    }
 171
 172    upload_default_color(brw, gl_sampler, unit, sdc_offset);
 173
 174    sampler->ss2.default_color_pointer = *sdc_offset >> 5;
 175
 176    if (sampler->ss0.min_filter != BRW_MAPFILTER_NEAREST)
 177       sampler->ss3.address_round |= BRW_ADDRESS_ROUNDING_ENABLE_U_MIN |
 178                                     BRW_ADDRESS_ROUNDING_ENABLE_V_MIN |
 179                                     BRW_ADDRESS_ROUNDING_ENABLE_R_MIN;
 180    if (sampler->ss0.mag_filter != BRW_MAPFILTER_NEAREST)
 181       sampler->ss3.address_round |= BRW_ADDRESS_ROUNDING_ENABLE_U_MAG |
 182                                     BRW_ADDRESS_ROUNDING_ENABLE_V_MAG |
 183                                     BRW_ADDRESS_ROUNDING_ENABLE_R_MAG;
 184 }
 185
 186
 187 static void
 188 gen7_upload_sampler_state_table(struct brw_context *brw,
 189                                 uint32_t *sampler_count,
 190                                 uint32_t *sst_offset,
 191                                 uint32_t *sdc_offset)
 192 {
 193    struct gl_context *ctx = &brw->ctx;
 194    struct gen7_sampler_state *samplers;
 195
 196    /* BRW_NEW_VERTEX_PROGRAM and BRW_NEW_FRAGMENT_PROGRAM */
 197    struct gl_program *vs = (struct gl_program *) brw->vertex_program;
 198    struct gl_program *fs = (struct gl_program *) brw->fragment_program;
 199
 200    GLbitfield SamplersUsed = vs->SamplersUsed | fs->SamplersUsed;
 201
 202    *sampler_count = _mesa_fls(SamplersUsed);
 203
 204    if (*sampler_count == 0)
 205       return;
 206
 207    samplers = brw_state_batch(brw, AUB_TRACE_SAMPLER_STATE,
 208                               *sampler_count * sizeof(*samplers),
 209                               32, sst_offset);
 210    memset(samplers, 0, *sampler_count * sizeof(*samplers));
 211
 212    for (unsigned s = 0; s < brw->wm.sampler_count; s++) {
 213       if (SamplersUsed & (1 << s)) {
 214          const unsigned unit = (fs->SamplersUsed & (1 << s)) ?
 215             fs->SamplerUnits[s] : vs->SamplerUnits[s];
 216          if (ctx->Texture.Unit[unit]._ReallyEnabled)
 217             gen7_update_sampler_state(brw, unit, s, &samplers[s],
 218                                       &sdc_offset[s]);
 219       }
 220    }
 221
 222    brw->state.dirty.cache |= CACHE_NEW_SAMPLER;
 223 }
 224
 225 void
 226 gen7_init_vtable_sampler_functions(struct brw_context *brw)
 227 {
 228    brw->vtbl.upload_sampler_state_table = gen7_upload_sampler_state_table;
 229 }