src/gallium/drivers/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 #include "util/u_math.h"
  33
  34 #include "brw_context.h"
  35 #include "brw_state.h"
  36 #include "brw_defines.h"
  37 #include "brw_screen.h"
  38
  39
  40 /* Samplers aren't strictly wm state from the hardware's perspective,
  41  * but that is the only situation in which we use them in this driver.
  42  */
  43
  44
  45
  46 static enum pipe_error
  47 upload_default_color( struct brw_context *brw,
  48                       const GLfloat *color,
  49                       struct brw_winsys_buffer **bo_out )
  50 {
  51    struct brw_sampler_default_color sdc;
  52    enum pipe_error ret;
  53
  54    COPY_4V(sdc.color, color);
  55
  56    ret = brw_cache_data( &brw->cache, BRW_SAMPLER_DEFAULT_COLOR, &sdc,
  57                          NULL, 0, bo_out );
  58    if (ret)
  59       return ret;
  60
  61    return PIPE_OK;
  62 }
  63
  64
  65 struct wm_sampler_key {
  66    int sampler_count;
  67    struct brw_sampler_state sampler[BRW_MAX_TEX_UNIT];
  68 };
  69
  70
  71 /** Sets up the cache key for sampler state for all texture units */
  72 static void
  73 brw_wm_sampler_populate_key(struct brw_context *brw,
  74                             struct wm_sampler_key *key)
  75 {
  76    int i;
  77
  78    memset(key, 0, sizeof(*key));
  79
  80    key->sampler_count = MIN2(brw->curr.num_textures,
  81                             brw->curr.num_samplers);
  82
  83    for (i = 0; i < key->sampler_count; i++) {
  84       const struct brw_texture *tex = brw_texture(brw->curr.texture[i]);
  85       const struct brw_sampler *sampler = brw->curr.sampler[i];
  86       struct brw_sampler_state *entry = &key->sampler[i];
  87
  88       entry->ss0 = sampler->ss0;
  89       entry->ss1 = sampler->ss1;
  90       entry->ss2.default_color_pointer = 0; /* reloc */
  91       entry->ss3 = sampler->ss3;
  92
  93       /* Cube-maps on 965 and later must use the same wrap mode for all 3
  94        * coordinate dimensions.  Futher, only CUBE and CLAMP are valid.
  95        */
  96       if (tex->base.target == PIPE_TEXTURE_CUBE) {
  97          if (FALSE &&
  98              (sampler->ss0.min_filter != BRW_MAPFILTER_NEAREST ||
  99               sampler->ss0.mag_filter != BRW_MAPFILTER_NEAREST)) {
 100             entry->ss1.r_wrap_mode = BRW_TEXCOORDMODE_CUBE;
 101             entry->ss1.s_wrap_mode = BRW_TEXCOORDMODE_CUBE;
 102             entry->ss1.t_wrap_mode = BRW_TEXCOORDMODE_CUBE;
 103          } else {
 104             entry->ss1.r_wrap_mode = BRW_TEXCOORDMODE_CLAMP;
 105             entry->ss1.s_wrap_mode = BRW_TEXCOORDMODE_CLAMP;
 106             entry->ss1.t_wrap_mode = BRW_TEXCOORDMODE_CLAMP;
 107          }
 108       } else if (tex->base.target == PIPE_TEXTURE_1D) {
 109          /* There's a bug in 1D texture sampling - it actually pays
 110           * attention to the wrap_t value, though it should not.
 111           * Override the wrap_t value here to GL_REPEAT to keep
 112           * any nonexistent border pixels from floating in.
 113           */
 114          entry->ss1.t_wrap_mode = BRW_TEXCOORDMODE_WRAP;
 115       }
 116    }
 117 }
 118
 119
 120 static enum pipe_error
 121 brw_wm_sampler_update_default_colors(struct brw_context *brw)
 122 {
 123    enum pipe_error ret;
 124    int nr = MIN2(brw->curr.num_textures,
 125                  brw->curr.num_samplers);
 126    int i;
 127
 128    for (i = 0; i < nr; i++) {
 129       const struct brw_texture *tex = brw_texture(brw->curr.texture[i]);
 130       const struct brw_sampler *sampler = brw->curr.sampler[i];
 131       const float *bc;
 132
 133       if (pf_is_depth_or_stencil(tex->base.format)) {
 134          float bordercolor[4] = {
 135             sampler->border_color[0],
 136             sampler->border_color[0],
 137             sampler->border_color[0],
 138             sampler->border_color[0]
 139          };
 140
 141          bc = bordercolor;
 142       }
 143       else {
 144          bc = sampler->border_color;
 145       }
 146
 147       /* GL specs that border color for depth textures is taken from the
 148        * R channel, while the hardware uses A.  Spam R into all the
 149        * channels for safety.
 150        */
 151       ret = upload_default_color(brw,
 152                                  bc,
 153                                  &brw->wm.sdc_bo[i]);
 154       if (ret)
 155          return ret;
 156    }
 157
 158    return PIPE_OK;
 159 }
 160
 161
 162
 163 /* All samplers must be uploaded in a single contiguous array.
 164  */
 165 static int upload_wm_samplers( struct brw_context *brw )
 166 {
 167    struct wm_sampler_key key;
 168    enum pipe_error ret;
 169    int i;
 170
 171    brw_wm_sampler_update_default_colors(brw);
 172    brw_wm_sampler_populate_key(brw, &key);
 173
 174    if (brw->wm.sampler_count != key.sampler_count) {
 175       brw->wm.sampler_count = key.sampler_count;
 176       brw->state.dirty.cache |= CACHE_NEW_SAMPLER;
 177    }
 178
 179    if (brw->wm.sampler_count == 0) {
 180       bo_reference(&brw->wm.sampler_bo, NULL);
 181       return PIPE_OK;
 182    }
 183
 184    if (brw_search_cache(&brw->cache, BRW_SAMPLER,
 185                         &key, sizeof(key),
 186                         brw->wm.sdc_bo, key.sampler_count,
 187                         NULL,
 188                         &brw->wm.sampler_bo))
 189       return PIPE_OK;
 190
 191    /* If we didnt find it in the cache, compute the state and put it in the
 192     * cache.
 193     */
 194    ret = brw_upload_cache(&brw->cache, BRW_SAMPLER,
 195                           &key, sizeof(key),
 196                           brw->wm.sdc_bo, key.sampler_count,
 197                           &key.sampler, sizeof(key.sampler),
 198                           NULL, NULL,
 199                           &brw->wm.sampler_bo);
 200    if (ret)
 201       return ret;
 202
 203    /* Emit SDC relocations */
 204    for (i = 0; i < key.sampler_count; i++) {
 205       ret = brw->sws->bo_emit_reloc(brw->wm.sampler_bo,
 206                                     BRW_USAGE_SAMPLER,
 207                                     0,
 208                                     i * sizeof(struct brw_sampler_state) +
 209                                     offsetof(struct brw_sampler_state, ss2),
 210                                     brw->wm.sdc_bo[i]);
 211       if (ret)
 212          return ret;
 213    }
 214
 215    return 0;
 216 }
 217
 218 const struct brw_tracked_state brw_wm_samplers = {
 219    .dirty = {
 220       .mesa = PIPE_NEW_BOUND_TEXTURES | PIPE_NEW_SAMPLERS,
 221       .brw = 0,
 222       .cache = 0
 223    },
 224    .prepare = upload_wm_samplers,
 225 };
 226
 227