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 #include "intel_mipmap_tree.h"
  29
  30 #include "main/macros.h"
  31 #include "main/samplerobj.h"
  32
  33 /**
  34  * Sets the sampler state for a single unit.
  35  */
  36 static void
  37 gen7_update_sampler_state(struct brw_context *brw, int unit, int ss_index,
  38                           struct gen7_sampler_state *sampler,
  39                           uint32_t *sdc_offset)
  40 {
  41    struct gl_context *ctx = &brw->ctx;
  42    struct gl_texture_unit *texUnit = &ctx->Texture.Unit[unit];
  43    struct gl_texture_object *texObj = texUnit->_Current;
  44    struct gl_sampler_object *gl_sampler = _mesa_get_samplerobj(ctx, unit);
  45    bool using_nearest = false;
  46
  47    /* These don't use samplers at all. */
  48    if (texObj->Target == GL_TEXTURE_BUFFER)
  49       return;
  50
  51    switch (gl_sampler->MinFilter) {
  52    case GL_NEAREST:
  53       sampler->ss0.min_filter = BRW_MAPFILTER_NEAREST;
  54       sampler->ss0.mip_filter = BRW_MIPFILTER_NONE;
  55       using_nearest = true;
  56       break;
  57    case GL_LINEAR:
  58       sampler->ss0.min_filter = BRW_MAPFILTER_LINEAR;
  59       sampler->ss0.mip_filter = BRW_MIPFILTER_NONE;
  60       break;
  61    case GL_NEAREST_MIPMAP_NEAREST:
  62       sampler->ss0.min_filter = BRW_MAPFILTER_NEAREST;
  63       sampler->ss0.mip_filter = BRW_MIPFILTER_NEAREST;
  64       break;
  65    case GL_LINEAR_MIPMAP_NEAREST:
  66       sampler->ss0.min_filter = BRW_MAPFILTER_LINEAR;
  67       sampler->ss0.mip_filter = BRW_MIPFILTER_NEAREST;
  68       break;
  69    case GL_NEAREST_MIPMAP_LINEAR:
  70       sampler->ss0.min_filter = BRW_MAPFILTER_NEAREST;
  71       sampler->ss0.mip_filter = BRW_MIPFILTER_LINEAR;
  72       break;
  73    case GL_LINEAR_MIPMAP_LINEAR:
  74       sampler->ss0.min_filter = BRW_MAPFILTER_LINEAR;
  75       sampler->ss0.mip_filter = BRW_MIPFILTER_LINEAR;
  76       break;
  77    default:
  78       break;
  79    }
  80
  81    /* Set Anisotropy: */
  82    if (gl_sampler->MaxAnisotropy > 1.0) {
  83       sampler->ss0.min_filter = BRW_MAPFILTER_ANISOTROPIC;
  84       sampler->ss0.mag_filter = BRW_MAPFILTER_ANISOTROPIC;
  85
  86       if (gl_sampler->MaxAnisotropy > 2.0) {
  87          sampler->ss3.max_aniso = MIN2((gl_sampler->MaxAnisotropy - 2) / 2,
  88                                        BRW_ANISORATIO_16);
  89       }
  90    }
  91    else {
  92       switch (gl_sampler->MagFilter) {
  93       case GL_NEAREST:
  94          sampler->ss0.mag_filter = BRW_MAPFILTER_NEAREST;
  95          using_nearest = true;
  96          break;
  97       case GL_LINEAR:
  98          sampler->ss0.mag_filter = BRW_MAPFILTER_LINEAR;
  99          break;
 100       default:
 101          break;
 102       }
 103    }
 104
 105    sampler->ss3.r_wrap_mode = translate_wrap_mode(gl_sampler->WrapR,
 106                                                   using_nearest);
 107    sampler->ss3.s_wrap_mode = translate_wrap_mode(gl_sampler->WrapS,
 108                                                   using_nearest);
 109    sampler->ss3.t_wrap_mode = translate_wrap_mode(gl_sampler->WrapT,
 110                                                   using_nearest);
 111
 112    /* Cube-maps on 965 and later must use the same wrap mode for all 3
 113     * coordinate dimensions.  Futher, only CUBE and CLAMP are valid.
 114     */
 115    if (texObj->Target == GL_TEXTURE_CUBE_MAP ||
 116        texObj->Target == GL_TEXTURE_CUBE_MAP_ARRAY) {
 117       if ((ctx->Texture.CubeMapSeamless || gl_sampler->CubeMapSeamless) &&
 118           (gl_sampler->MinFilter != GL_NEAREST ||
 119            gl_sampler->MagFilter != GL_NEAREST)) {
 120          sampler->ss3.r_wrap_mode = BRW_TEXCOORDMODE_CUBE;
 121          sampler->ss3.s_wrap_mode = BRW_TEXCOORDMODE_CUBE;
 122          sampler->ss3.t_wrap_mode = BRW_TEXCOORDMODE_CUBE;
 123       } else {
 124          sampler->ss3.r_wrap_mode = BRW_TEXCOORDMODE_CLAMP;
 125          sampler->ss3.s_wrap_mode = BRW_TEXCOORDMODE_CLAMP;
 126          sampler->ss3.t_wrap_mode = BRW_TEXCOORDMODE_CLAMP;
 127       }
 128    } else if (texObj->Target == GL_TEXTURE_1D) {
 129       /* There's a bug in 1D texture sampling - it actually pays
 130        * attention to the wrap_t value, though it should not.
 131        * Override the wrap_t value here to GL_REPEAT to keep
 132        * any nonexistent border pixels from floating in.
 133        */
 134       sampler->ss3.t_wrap_mode = BRW_TEXCOORDMODE_WRAP;
 135    }
 136
 137    /* Set shadow function: */
 138    if (gl_sampler->CompareMode == GL_COMPARE_R_TO_TEXTURE_ARB) {
 139       /* Shadowing is "enabled" by emitting a particular sampler
 140        * message (sample_c).  So need to recompile WM program when
 141        * shadow comparison is enabled on each/any texture unit.
 142        */
 143       sampler->ss1.shadow_function =
 144          intel_translate_shadow_compare_func(gl_sampler->CompareFunc);
 145    }
 146
 147    /* Set LOD bias: */
 148    sampler->ss0.lod_bias = S_FIXED(CLAMP(texUnit->LodBias +
 149                                          gl_sampler->LodBias, -16, 15), 8);
 150
 151    sampler->ss0.lod_preclamp = 1; /* OpenGL mode */
 152    sampler->ss0.default_color_mode = 0; /* OpenGL/DX10 mode */
 153
 154    sampler->ss0.base_level = U_FIXED(0, 1);
 155
 156    sampler->ss1.max_lod = U_FIXED(CLAMP(gl_sampler->MaxLod, 0, 13), 8);
 157    sampler->ss1.min_lod = U_FIXED(CLAMP(gl_sampler->MinLod, 0, 13), 8);
 158
 159    /* The sampler can handle non-normalized texture rectangle coordinates
 160     * natively
 161     */
 162    if (texObj->Target == GL_TEXTURE_RECTANGLE) {
 163       sampler->ss3.non_normalized_coord = 1;
 164    }
 165
 166    upload_default_color(brw, gl_sampler, unit, sdc_offset);
 167
 168    sampler->ss2.default_color_pointer = *sdc_offset >> 5;
 169
 170    if (sampler->ss0.min_filter != BRW_MAPFILTER_NEAREST)
 171       sampler->ss3.address_round |= BRW_ADDRESS_ROUNDING_ENABLE_U_MIN |
 172                                     BRW_ADDRESS_ROUNDING_ENABLE_V_MIN |
 173                                     BRW_ADDRESS_ROUNDING_ENABLE_R_MIN;
 174    if (sampler->ss0.mag_filter != BRW_MAPFILTER_NEAREST)
 175       sampler->ss3.address_round |= BRW_ADDRESS_ROUNDING_ENABLE_U_MAG |
 176                                     BRW_ADDRESS_ROUNDING_ENABLE_V_MAG |
 177                                     BRW_ADDRESS_ROUNDING_ENABLE_R_MAG;
 178 }
 179
 180
 181 static void
 182 gen7_upload_sampler_state_table(struct brw_context *brw,
 183                                 struct gl_program *prog,
 184                                 uint32_t sampler_count,
 185                                 uint32_t *sst_offset,
 186                                 uint32_t *sdc_offset)
 187 {
 188    struct gl_context *ctx = &brw->ctx;
 189    struct gen7_sampler_state *samplers;
 190
 191    GLbitfield SamplersUsed = prog->SamplersUsed;
 192
 193    if (sampler_count == 0)
 194       return;
 195
 196    samplers = brw_state_batch(brw, AUB_TRACE_SAMPLER_STATE,
 197                               sampler_count * sizeof(*samplers),
 198                               32, sst_offset);
 199    memset(samplers, 0, sampler_count * sizeof(*samplers));
 200
 201    for (unsigned s = 0; s < sampler_count; s++) {
 202       if (SamplersUsed & (1 << s)) {
 203          const unsigned unit = prog->SamplerUnits[s];
 204          if (ctx->Texture.Unit[unit]._ReallyEnabled)
 205             gen7_update_sampler_state(brw, unit, s, &samplers[s],
 206                                       &sdc_offset[s]);
 207       }
 208    }
 209
 210    brw->state.dirty.cache |= CACHE_NEW_SAMPLER;
 211 }
 212
 213 void
 214 gen7_init_vtable_sampler_functions(struct brw_context *brw)
 215 {
 216    brw->vtbl.upload_sampler_state_table = gen7_upload_sampler_state_table;
 217 }