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 intel_texture_image *intel_image =
  45       intel_texture_image(texObj->Image[0][texObj->BaseLevel]);
  46    struct gl_sampler_object *gl_sampler = _mesa_get_samplerobj(ctx, unit);
  47    bool using_nearest = false;
  48
  49    /* These don't use samplers at all. */
  50    if (texObj->Target == GL_TEXTURE_BUFFER)
  51       return;
  52
  53    switch (gl_sampler->MinFilter) {
  54    case GL_NEAREST:
  55       sampler->ss0.min_filter = BRW_MAPFILTER_NEAREST;
  56       sampler->ss0.mip_filter = BRW_MIPFILTER_NONE;
  57       using_nearest = true;
  58       break;
  59    case GL_LINEAR:
  60       sampler->ss0.min_filter = BRW_MAPFILTER_LINEAR;
  61       sampler->ss0.mip_filter = BRW_MIPFILTER_NONE;
  62       break;
  63    case GL_NEAREST_MIPMAP_NEAREST:
  64       sampler->ss0.min_filter = BRW_MAPFILTER_NEAREST;
  65       sampler->ss0.mip_filter = BRW_MIPFILTER_NEAREST;
  66       break;
  67    case GL_LINEAR_MIPMAP_NEAREST:
  68       sampler->ss0.min_filter = BRW_MAPFILTER_LINEAR;
  69       sampler->ss0.mip_filter = BRW_MIPFILTER_NEAREST;
  70       break;
  71    case GL_NEAREST_MIPMAP_LINEAR:
  72       sampler->ss0.min_filter = BRW_MAPFILTER_NEAREST;
  73       sampler->ss0.mip_filter = BRW_MIPFILTER_LINEAR;
  74       break;
  75    case GL_LINEAR_MIPMAP_LINEAR:
  76       sampler->ss0.min_filter = BRW_MAPFILTER_LINEAR;
  77       sampler->ss0.mip_filter = BRW_MIPFILTER_LINEAR;
  78       break;
  79    default:
  80       break;
  81    }
  82
  83    /* Set Anisotropy: */
  84    if (gl_sampler->MaxAnisotropy > 1.0) {
  85       sampler->ss0.min_filter = BRW_MAPFILTER_ANISOTROPIC;
  86       sampler->ss0.mag_filter = BRW_MAPFILTER_ANISOTROPIC;
  87
  88       if (gl_sampler->MaxAnisotropy > 2.0) {
  89          sampler->ss3.max_aniso = MIN2((gl_sampler->MaxAnisotropy - 2) / 2,
  90                                        BRW_ANISORATIO_16);
  91       }
  92    }
  93    else {
  94       switch (gl_sampler->MagFilter) {
  95       case GL_NEAREST:
  96          sampler->ss0.mag_filter = BRW_MAPFILTER_NEAREST;
  97          using_nearest = true;
  98          break;
  99       case GL_LINEAR:
 100          sampler->ss0.mag_filter = BRW_MAPFILTER_LINEAR;
 101          break;
 102       default:
 103          break;
 104       }
 105    }
 106
 107    sampler->ss3.r_wrap_mode = translate_wrap_mode(gl_sampler->WrapR,
 108                                                   using_nearest);
 109    sampler->ss3.s_wrap_mode = translate_wrap_mode(gl_sampler->WrapS,
 110                                                   using_nearest);
 111    sampler->ss3.t_wrap_mode = translate_wrap_mode(gl_sampler->WrapT,
 112                                                   using_nearest);
 113
 114    /* Cube-maps on 965 and later must use the same wrap mode for all 3
 115     * coordinate dimensions.  Futher, only CUBE and CLAMP are valid.
 116     */
 117    if (texObj->Target == GL_TEXTURE_CUBE_MAP ||
 118        texObj->Target == GL_TEXTURE_CUBE_MAP_ARRAY) {
 119       if (ctx->Texture.CubeMapSeamless &&
 120           (gl_sampler->MinFilter != GL_NEAREST ||
 121            gl_sampler->MagFilter != GL_NEAREST)) {
 122          sampler->ss3.r_wrap_mode = BRW_TEXCOORDMODE_CUBE;
 123          sampler->ss3.s_wrap_mode = BRW_TEXCOORDMODE_CUBE;
 124          sampler->ss3.t_wrap_mode = BRW_TEXCOORDMODE_CUBE;
 125       } else {
 126          sampler->ss3.r_wrap_mode = BRW_TEXCOORDMODE_CLAMP;
 127          sampler->ss3.s_wrap_mode = BRW_TEXCOORDMODE_CLAMP;
 128          sampler->ss3.t_wrap_mode = BRW_TEXCOORDMODE_CLAMP;
 129       }
 130    } else if (texObj->Target == GL_TEXTURE_1D) {
 131       /* There's a bug in 1D texture sampling - it actually pays
 132        * attention to the wrap_t value, though it should not.
 133        * Override the wrap_t value here to GL_REPEAT to keep
 134        * any nonexistent border pixels from floating in.
 135        */
 136       sampler->ss3.t_wrap_mode = BRW_TEXCOORDMODE_WRAP;
 137    }
 138
 139    /* Set shadow function: */
 140    if (gl_sampler->CompareMode == GL_COMPARE_R_TO_TEXTURE_ARB) {
 141       /* Shadowing is "enabled" by emitting a particular sampler
 142        * message (sample_c).  So need to recompile WM program when
 143        * shadow comparison is enabled on each/any texture unit.
 144        */
 145       sampler->ss1.shadow_function =
 146          intel_translate_shadow_compare_func(gl_sampler->CompareFunc);
 147    }
 148
 149    /* Set LOD bias: */
 150    sampler->ss0.lod_bias = S_FIXED(CLAMP(texUnit->LodBias +
 151                                          gl_sampler->LodBias, -16, 15), 8);
 152
 153    sampler->ss0.lod_preclamp = 1; /* OpenGL mode */
 154    sampler->ss0.default_color_mode = 0; /* OpenGL/DX10 mode */
 155
 156    int baselevel = texObj->BaseLevel - intel_image->mt->first_level;
 157    sampler->ss0.base_level = U_FIXED(baselevel, 1);
 158
 159    sampler->ss1.max_lod = U_FIXED(CLAMP(baselevel +
 160                                         gl_sampler->MaxLod, 0, 13), 8);
 161    sampler->ss1.min_lod = U_FIXED(CLAMP(baselevel +
 162                                         gl_sampler->MinLod, 0, 13), 8);
 163
 164    /* The sampler can handle non-normalized texture rectangle coordinates
 165     * natively
 166     */
 167    if (texObj->Target == GL_TEXTURE_RECTANGLE) {
 168       sampler->ss3.non_normalized_coord = 1;
 169    }
 170
 171    upload_default_color(brw, gl_sampler, unit, sdc_offset);
 172
 173    sampler->ss2.default_color_pointer = *sdc_offset >> 5;
 174
 175    if (sampler->ss0.min_filter != BRW_MAPFILTER_NEAREST)
 176       sampler->ss3.address_round |= BRW_ADDRESS_ROUNDING_ENABLE_U_MIN |
 177                                     BRW_ADDRESS_ROUNDING_ENABLE_V_MIN |
 178                                     BRW_ADDRESS_ROUNDING_ENABLE_R_MIN;
 179    if (sampler->ss0.mag_filter != BRW_MAPFILTER_NEAREST)
 180       sampler->ss3.address_round |= BRW_ADDRESS_ROUNDING_ENABLE_U_MAG |
 181                                     BRW_ADDRESS_ROUNDING_ENABLE_V_MAG |
 182                                     BRW_ADDRESS_ROUNDING_ENABLE_R_MAG;
 183 }
 184
 185
 186 static void
 187 gen7_upload_sampler_state_table(struct brw_context *brw,
 188                                 struct gl_program *prog,
 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    GLbitfield SamplersUsed = prog->SamplersUsed;
 197
 198    if (sampler_count == 0)
 199       return;
 200
 201    samplers = brw_state_batch(brw, AUB_TRACE_SAMPLER_STATE,
 202                               sampler_count * sizeof(*samplers),
 203                               32, sst_offset);
 204    memset(samplers, 0, sampler_count * sizeof(*samplers));
 205
 206    for (unsigned s = 0; s < sampler_count; s++) {
 207       if (SamplersUsed & (1 << s)) {
 208          const unsigned unit = prog->SamplerUnits[s];
 209          if (ctx->Texture.Unit[unit]._ReallyEnabled)
 210             gen7_update_sampler_state(brw, unit, s, &samplers[s],
 211                                       &sdc_offset[s]);
 212       }
 213    }
 214
 215    brw->state.dirty.cache |= CACHE_NEW_SAMPLER;
 216 }
 217
 218 void
 219 gen7_init_vtable_sampler_functions(struct brw_context *brw)
 220 {
 221    brw->vtbl.upload_sampler_state_table = gen7_upload_sampler_state_table;
 222 }