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 {
  39    struct gl_context *ctx = &brw->ctx;
  40    struct gl_texture_unit *texUnit = &ctx->Texture.Unit[unit];
  41    struct gl_texture_object *texObj = texUnit->_Current;
  42    struct gl_sampler_object *gl_sampler = _mesa_get_samplerobj(ctx, unit);
  43    bool using_nearest = false;
  44
  45    /* These don't use samplers at all. */
  46    if (texObj->Target == GL_TEXTURE_BUFFER)
  47       return;
  48
  49    switch (gl_sampler->MinFilter) {
  50    case GL_NEAREST:
  51       sampler->ss0.min_filter = BRW_MAPFILTER_NEAREST;
  52       sampler->ss0.mip_filter = BRW_MIPFILTER_NONE;
  53       using_nearest = true;
  54       break;
  55    case GL_LINEAR:
  56       sampler->ss0.min_filter = BRW_MAPFILTER_LINEAR;
  57       sampler->ss0.mip_filter = BRW_MIPFILTER_NONE;
  58       break;
  59    case GL_NEAREST_MIPMAP_NEAREST:
  60       sampler->ss0.min_filter = BRW_MAPFILTER_NEAREST;
  61       sampler->ss0.mip_filter = BRW_MIPFILTER_NEAREST;
  62       break;
  63    case GL_LINEAR_MIPMAP_NEAREST:
  64       sampler->ss0.min_filter = BRW_MAPFILTER_LINEAR;
  65       sampler->ss0.mip_filter = BRW_MIPFILTER_NEAREST;
  66       break;
  67    case GL_NEAREST_MIPMAP_LINEAR:
  68       sampler->ss0.min_filter = BRW_MAPFILTER_NEAREST;
  69       sampler->ss0.mip_filter = BRW_MIPFILTER_LINEAR;
  70       break;
  71    case GL_LINEAR_MIPMAP_LINEAR:
  72       sampler->ss0.min_filter = BRW_MAPFILTER_LINEAR;
  73       sampler->ss0.mip_filter = BRW_MIPFILTER_LINEAR;
  74       break;
  75    default:
  76       break;
  77    }
  78
  79    /* Set Anisotropy: */
  80    if (gl_sampler->MaxAnisotropy > 1.0) {
  81       sampler->ss0.min_filter = BRW_MAPFILTER_ANISOTROPIC;
  82       sampler->ss0.mag_filter = BRW_MAPFILTER_ANISOTROPIC;
  83
  84       if (gl_sampler->MaxAnisotropy > 2.0) {
  85          sampler->ss3.max_aniso = MIN2((gl_sampler->MaxAnisotropy - 2) / 2,
  86                                        BRW_ANISORATIO_16);
  87       }
  88    }
  89    else {
  90       switch (gl_sampler->MagFilter) {
  91       case GL_NEAREST:
  92          sampler->ss0.mag_filter = BRW_MAPFILTER_NEAREST;
  93          using_nearest = true;
  94          break;
  95       case GL_LINEAR:
  96          sampler->ss0.mag_filter = BRW_MAPFILTER_LINEAR;
  97          break;
  98       default:
  99          break;
 100       }
 101    }
 102
 103    sampler->ss3.r_wrap_mode = translate_wrap_mode(gl_sampler->WrapR,
 104                                                   using_nearest);
 105    sampler->ss3.s_wrap_mode = translate_wrap_mode(gl_sampler->WrapS,
 106                                                   using_nearest);
 107    sampler->ss3.t_wrap_mode = translate_wrap_mode(gl_sampler->WrapT,
 108                                                   using_nearest);
 109
 110    /* Cube-maps on 965 and later must use the same wrap mode for all 3
 111     * coordinate dimensions.  Futher, only CUBE and CLAMP are valid.
 112     */
 113    if (texObj->Target == GL_TEXTURE_CUBE_MAP ||
 114        texObj->Target == GL_TEXTURE_CUBE_MAP_ARRAY) {
 115       if (ctx->Texture.CubeMapSeamless &&
 116           (gl_sampler->MinFilter != GL_NEAREST ||
 117            gl_sampler->MagFilter != GL_NEAREST)) {
 118          sampler->ss3.r_wrap_mode = BRW_TEXCOORDMODE_CUBE;
 119          sampler->ss3.s_wrap_mode = BRW_TEXCOORDMODE_CUBE;
 120          sampler->ss3.t_wrap_mode = BRW_TEXCOORDMODE_CUBE;
 121       } else {
 122          sampler->ss3.r_wrap_mode = BRW_TEXCOORDMODE_CLAMP;
 123          sampler->ss3.s_wrap_mode = BRW_TEXCOORDMODE_CLAMP;
 124          sampler->ss3.t_wrap_mode = BRW_TEXCOORDMODE_CLAMP;
 125       }
 126    } else if (texObj->Target == GL_TEXTURE_1D) {
 127       /* There's a bug in 1D texture sampling - it actually pays
 128        * attention to the wrap_t value, though it should not.
 129        * Override the wrap_t value here to GL_REPEAT to keep
 130        * any nonexistent border pixels from floating in.
 131        */
 132       sampler->ss3.t_wrap_mode = BRW_TEXCOORDMODE_WRAP;
 133    }
 134
 135    /* Set shadow function: */
 136    if (gl_sampler->CompareMode == GL_COMPARE_R_TO_TEXTURE_ARB) {
 137       /* Shadowing is "enabled" by emitting a particular sampler
 138        * message (sample_c).  So need to recompile WM program when
 139        * shadow comparison is enabled on each/any texture unit.
 140        */
 141       sampler->ss1.shadow_function =
 142          intel_translate_shadow_compare_func(gl_sampler->CompareFunc);
 143    }
 144
 145    /* Set LOD bias: */
 146    sampler->ss0.lod_bias = S_FIXED(CLAMP(texUnit->LodBias +
 147                                          gl_sampler->LodBias, -16, 15), 8);
 148
 149    sampler->ss0.lod_preclamp = 1; /* OpenGL mode */
 150    sampler->ss0.default_color_mode = 0; /* OpenGL/DX10 mode */
 151
 152    /* Set BaseMipLevel, MaxLOD, MinLOD:
 153     *
 154     * XXX: I don't think that using firstLevel, lastLevel works,
 155     * because we always setup the surface state as if firstLevel ==
 156     * level zero.  Probably have to subtract firstLevel from each of
 157     * these:
 158     */
 159    sampler->ss0.base_level = U_FIXED(0, 1);
 160
 161    sampler->ss1.max_lod = U_FIXED(CLAMP(gl_sampler->MaxLod, 0, 13), 8);
 162    sampler->ss1.min_lod = U_FIXED(CLAMP(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, &brw->wm.sdc_offset[ss_index]);
 172
 173    sampler->ss2.default_color_pointer = brw->wm.sdc_offset[ss_index] >> 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_samplers(struct brw_context *brw)
 188 {
 189    struct gl_context *ctx = &brw->ctx;
 190    struct gen7_sampler_state *samplers;
 191
 192    /* BRW_NEW_VERTEX_PROGRAM and BRW_NEW_FRAGMENT_PROGRAM */
 193    struct gl_program *vs = (struct gl_program *) brw->vertex_program;
 194    struct gl_program *fs = (struct gl_program *) brw->fragment_program;
 195
 196    GLbitfield SamplersUsed = vs->SamplersUsed | fs->SamplersUsed;
 197
 198    brw->wm.sampler_count = _mesa_fls(SamplersUsed);
 199    /* Currently we only use one sampler state table.  Mirror the count. */
 200    brw->vs.sampler_count = brw->wm.sampler_count;
 201
 202    if (brw->wm.sampler_count == 0)
 203       return;
 204
 205    samplers = brw_state_batch(brw, AUB_TRACE_SAMPLER_STATE,
 206                               brw->wm.sampler_count * sizeof(*samplers),
 207                               32, &brw->sampler.offset);
 208    memset(samplers, 0, brw->wm.sampler_count * sizeof(*samplers));
 209
 210    for (unsigned s = 0; s < brw->wm.sampler_count; s++) {
 211       if (SamplersUsed & (1 << s)) {
 212          const unsigned unit = (fs->SamplersUsed & (1 << s)) ?
 213             fs->SamplerUnits[s] : vs->SamplerUnits[s];
 214          if (ctx->Texture.Unit[unit]._ReallyEnabled)
 215             gen7_update_sampler_state(brw, unit, s, &samplers[s]);
 216       }
 217    }
 218
 219    brw->state.dirty.cache |= CACHE_NEW_SAMPLER;
 220 }
 221
 222 const struct brw_tracked_state gen7_samplers = {
 223    .dirty = {
 224       .mesa = _NEW_TEXTURE,
 225       .brw = BRW_NEW_BATCH |
 226              BRW_NEW_VERTEX_PROGRAM |
 227              BRW_NEW_FRAGMENT_PROGRAM,
 228       .cache = 0
 229    },
 230    .emit = gen7_upload_samplers,
 231 };