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 #include "util/u_format.h"
  34
  35 #include "brw_context.h"
  36 #include "brw_state.h"
  37 #include "brw_defines.h"
  38 #include "brw_screen.h"
  39
  40
  41 /* Samplers aren't strictly wm state from the hardware's perspective,
  42  * but that is the only situation in which we use them in this driver.
  43  */
  44
  45
  46
  47 static enum pipe_error
  48 upload_default_color( struct brw_context *brw,
  49                       const GLfloat *color,
  50                       struct brw_winsys_buffer **bo_out )
  51 {
  52    struct brw_sampler_default_color sdc;
  53    enum pipe_error ret;
  54
  55    COPY_4V(sdc.color, color);
  56
  57    ret = brw_cache_data( &brw->cache, BRW_SAMPLER_DEFAULT_COLOR, &sdc,
  58                          NULL, 0, bo_out );
  59    if (ret)
  60       return ret;
  61
  62    return PIPE_OK;
  63 }
  64
  65
  66 struct wm_sampler_key {
  67    int sampler_count;
  68    struct brw_sampler_state sampler[BRW_MAX_TEX_UNIT];
  69 };
  70
  71
  72 /** Sets up the cache key for sampler state for all texture units */
  73 static void
  74 brw_wm_sampler_populate_key(struct brw_context *brw,
  75                             struct wm_sampler_key *key)
  76 {
  77    int i;
  78
  79    memset(key, 0, sizeof(*key));
  80
  81    key->sampler_count = MIN2(brw->curr.num_textures,
  82                             brw->curr.num_samplers);
  83
  84    for (i = 0; i < key->sampler_count; i++) {
  85       const struct brw_texture *tex = brw_texture(brw->curr.texture[i]);
  86       const struct brw_sampler *sampler = brw->curr.sampler[i];
  87       struct brw_sampler_state *entry = &key->sampler[i];
  88
  89       entry->ss0 = sampler->ss0;
  90       entry->ss1 = sampler->ss1;
  91       entry->ss2.default_color_pointer = 0; /* reloc */
  92       entry->ss3 = sampler->ss3;
  93
  94       /* Cube-maps on 965 and later must use the same wrap mode for all 3
  95        * coordinate dimensions.  Futher, only CUBE and CLAMP are valid.
  96        */
  97       if (tex->base.target == PIPE_TEXTURE_CUBE) {
  98          if (FALSE &&
  99              (sampler->ss0.min_filter != BRW_MAPFILTER_NEAREST ||
 100               sampler->ss0.mag_filter != BRW_MAPFILTER_NEAREST)) {
 101             entry->ss1.r_wrap_mode = BRW_TEXCOORDMODE_CUBE;
 102             entry->ss1.s_wrap_mode = BRW_TEXCOORDMODE_CUBE;
 103             entry->ss1.t_wrap_mode = BRW_TEXCOORDMODE_CUBE;
 104          } else {
 105             entry->ss1.r_wrap_mode = BRW_TEXCOORDMODE_CLAMP;
 106             entry->ss1.s_wrap_mode = BRW_TEXCOORDMODE_CLAMP;
 107             entry->ss1.t_wrap_mode = BRW_TEXCOORDMODE_CLAMP;
 108          }
 109       } else if (tex->base.target == PIPE_TEXTURE_1D) {
 110          /* There's a bug in 1D texture sampling - it actually pays
 111           * attention to the wrap_t value, though it should not.
 112           * Override the wrap_t value here to GL_REPEAT to keep
 113           * any nonexistent border pixels from floating in.
 114           */
 115          entry->ss1.t_wrap_mode = BRW_TEXCOORDMODE_WRAP;
 116       }
 117    }
 118 }
 119
 120
 121 static enum pipe_error
 122 brw_wm_sampler_update_default_colors(struct brw_context *brw)
 123 {
 124    enum pipe_error ret;
 125    int nr = MIN2(brw->curr.num_textures,
 126                  brw->curr.num_samplers);
 127    int i;
 128
 129    for (i = 0; i < nr; i++) {
 130       const struct brw_texture *tex = brw_texture(brw->curr.texture[i]);
 131       const struct brw_sampler *sampler = brw->curr.sampler[i];
 132       const float *bc;
 133
 134       if (util_format_is_depth_or_stencil(tex->base.format)) {
 135          float bordercolor[4] = {
 136             sampler->border_color[0],
 137             sampler->border_color[0],
 138             sampler->border_color[0],
 139             sampler->border_color[0]
 140          };
 141
 142          bc = bordercolor;
 143       }
 144       else {
 145          bc = sampler->border_color;
 146       }
 147
 148       /* GL specs that border color for depth textures is taken from the
 149        * R channel, while the hardware uses A.  Spam R into all the
 150        * channels for safety.
 151        */
 152       ret = upload_default_color(brw,
 153                                  bc,
 154                                  &brw->wm.sdc_bo[i]);
 155       if (ret)
 156          return ret;
 157    }
 158
 159    return PIPE_OK;
 160 }
 161
 162
 163
 164 /* All samplers must be uploaded in a single contiguous array.
 165  */
 166 static int upload_wm_samplers( struct brw_context *brw )
 167 {
 168    struct wm_sampler_key key;
 169    struct brw_winsys_reloc reloc[BRW_MAX_TEX_UNIT];
 170    enum pipe_error ret;
 171    int i;
 172
 173    brw_wm_sampler_update_default_colors(brw);
 174    brw_wm_sampler_populate_key(brw, &key);
 175
 176    if (brw->wm.sampler_count != key.sampler_count) {
 177       brw->wm.sampler_count = key.sampler_count;
 178       brw->state.dirty.cache |= CACHE_NEW_SAMPLER;
 179    }
 180
 181    if (brw->wm.sampler_count == 0) {
 182       bo_reference(&brw->wm.sampler_bo, NULL);
 183       return PIPE_OK;
 184    }
 185
 186    /* Emit SDC relocations */
 187    for (i = 0; i < key.sampler_count; i++) {
 188       make_reloc( &reloc[i],
 189                   BRW_USAGE_SAMPLER,
 190                   0,
 191                   i * sizeof(struct brw_sampler_state) +
 192                   offsetof(struct brw_sampler_state, ss2),
 193                   brw->wm.sdc_bo[i]);
 194    }
 195
 196
 197    if (brw_search_cache(&brw->cache, BRW_SAMPLER,
 198                         &key, sizeof(key),
 199                         reloc, key.sampler_count,
 200                         NULL,
 201                         &brw->wm.sampler_bo))
 202       return PIPE_OK;
 203
 204    /* If we didnt find it in the cache, compute the state and put it in the
 205     * cache.
 206     */
 207    ret = brw_upload_cache(&brw->cache, BRW_SAMPLER,
 208                           &key, sizeof(key),
 209                           reloc, key.sampler_count,
 210                           &key.sampler, sizeof(key.sampler),
 211                           NULL, NULL,
 212                           &brw->wm.sampler_bo);
 213    if (ret)
 214       return ret;
 215
 216
 217    return 0;
 218 }
 219
 220 const struct brw_tracked_state brw_wm_samplers = {
 221    .dirty = {
 222       .mesa = PIPE_NEW_BOUND_TEXTURES | PIPE_NEW_SAMPLERS,
 223       .brw = 0,
 224       .cache = 0
 225    },
 226    .prepare = upload_wm_samplers,
 227 };
 228
 229