src/mesa/drivers/dri/i965/gen6_depthstencil.c

   1 /*
   2  * Copyright © 2009 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  * Authors:
  24  *    Eric Anholt <eric@anholt.net>
  25  *
  26  */
  27
  28 #include "brw_context.h"
  29 #include "brw_state.h"
  30 #include "brw_defines.h"
  31 #include "brw_util.h"
  32 #include "main/macros.h"
  33 #include "main/enums.h"
  34
  35 struct brw_depth_stencil_state_key {
  36    GLenum depth_func;
  37    GLboolean depth_test, depth_write;
  38    GLboolean stencil, stencil_two_side;
  39    GLenum stencil_func[2], stencil_fail_op[2];
  40    GLenum stencil_pass_depth_fail_op[2], stencil_pass_depth_pass_op[2];
  41    GLubyte stencil_write_mask[2], stencil_test_mask[2];
  42 };
  43
  44 static void
  45 depth_stencil_state_populate_key(struct brw_context *brw,
  46                                  struct brw_depth_stencil_state_key *key)
  47 {
  48    GLcontext *ctx = &brw->intel.ctx;
  49    const unsigned back = ctx->Stencil._BackFace;
  50
  51    memset(key, 0, sizeof(*key));
  52
  53    /* _NEW_STENCIL */
  54    key->stencil = ctx->Stencil._Enabled;
  55    key->stencil_two_side = ctx->Stencil._TestTwoSide;
  56
  57    if (key->stencil) {
  58       key->stencil_func[0] = ctx->Stencil.Function[0];
  59       key->stencil_fail_op[0] = ctx->Stencil.FailFunc[0];
  60       key->stencil_pass_depth_fail_op[0] = ctx->Stencil.ZFailFunc[0];
  61       key->stencil_pass_depth_pass_op[0] = ctx->Stencil.ZPassFunc[0];
  62       key->stencil_write_mask[0] = ctx->Stencil.WriteMask[0];
  63       key->stencil_test_mask[0] = ctx->Stencil.ValueMask[0];
  64    }
  65    if (key->stencil_two_side) {
  66       key->stencil_func[1] = ctx->Stencil.Function[back];
  67       key->stencil_fail_op[1] = ctx->Stencil.FailFunc[back];
  68       key->stencil_pass_depth_fail_op[1] = ctx->Stencil.ZFailFunc[back];
  69       key->stencil_pass_depth_pass_op[1] = ctx->Stencil.ZPassFunc[back];
  70       key->stencil_write_mask[1] = ctx->Stencil.WriteMask[back];
  71       key->stencil_test_mask[1] = ctx->Stencil.ValueMask[back];
  72    }
  73
  74    key->depth_test = ctx->Depth.Test;
  75    if (key->depth_test) {
  76       key->depth_func = ctx->Depth.Func;
  77       key->depth_write = ctx->Depth.Mask;
  78    }
  79 }
  80
  81 /**
  82  * Creates the state cache entry for the given DEPTH_STENCIL_STATE state key.
  83  */
  84 static dri_bo *
  85 depth_stencil_state_create_from_key(struct brw_context *brw,
  86                                     struct brw_depth_stencil_state_key *key)
  87 {
  88    struct gen6_depth_stencil_state ds;
  89    dri_bo *bo;
  90
  91    memset(&ds, 0, sizeof(ds));
  92
  93    /* _NEW_STENCIL */
  94    if (key->stencil) {
  95       ds.ds0.stencil_enable = 1;
  96       ds.ds0.stencil_func =
  97          intel_translate_compare_func(key->stencil_func[0]);
  98       ds.ds0.stencil_fail_op =
  99          intel_translate_stencil_op(key->stencil_fail_op[0]);
 100       ds.ds0.stencil_pass_depth_fail_op =
 101          intel_translate_stencil_op(key->stencil_pass_depth_fail_op[0]);
 102       ds.ds0.stencil_pass_depth_pass_op =
 103          intel_translate_stencil_op(key->stencil_pass_depth_pass_op[0]);
 104       ds.ds1.stencil_write_mask = key->stencil_write_mask[0];
 105       ds.ds1.stencil_test_mask = key->stencil_test_mask[0];
 106
 107       if (key->stencil_two_side) {
 108          ds.ds0.bf_stencil_enable = 1;
 109          ds.ds0.bf_stencil_func =
 110             intel_translate_compare_func(key->stencil_func[1]);
 111          ds.ds0.bf_stencil_fail_op =
 112             intel_translate_stencil_op(key->stencil_fail_op[1]);
 113          ds.ds0.bf_stencil_pass_depth_fail_op =
 114             intel_translate_stencil_op(key->stencil_pass_depth_fail_op[1]);
 115          ds.ds0.bf_stencil_pass_depth_pass_op =
 116             intel_translate_stencil_op(key->stencil_pass_depth_pass_op[1]);
 117          ds.ds1.bf_stencil_write_mask = key->stencil_write_mask[1];
 118          ds.ds1.bf_stencil_test_mask = key->stencil_test_mask[1];
 119       }
 120
 121       /* Not really sure about this:
 122        */
 123       if (key->stencil_write_mask[0] ||
 124           (key->stencil_two_side && key->stencil_write_mask[1]))
 125          ds.ds0.stencil_write_enable = 1;
 126    }
 127
 128    /* _NEW_DEPTH */
 129    if (key->depth_test) {
 130       ds.ds2.depth_test_enable = 1;
 131       ds.ds2.depth_test_func = intel_translate_compare_func(key->depth_func);
 132       ds.ds2.depth_write_enable = key->depth_write;
 133    }
 134
 135    bo = brw_upload_cache(&brw->cache, BRW_DEPTH_STENCIL_STATE,
 136                          key, sizeof(*key),
 137                          NULL, 0,
 138                          &ds, sizeof(ds));
 139
 140    return bo;
 141 }
 142
 143 static void
 144 prepare_depth_stencil_state(struct brw_context *brw)
 145 {
 146    struct brw_depth_stencil_state_key key;
 147
 148    depth_stencil_state_populate_key(brw, &key);
 149
 150    dri_bo_unreference(brw->cc.depth_stencil_state_bo);
 151    brw->cc.depth_stencil_state_bo = brw_search_cache(&brw->cache,
 152                                                      BRW_DEPTH_STENCIL_STATE,
 153                                                      &key, sizeof(key),
 154                                                      NULL, 0,
 155                                                      NULL);
 156
 157    if (brw->cc.depth_stencil_state_bo == NULL)
 158       brw->cc.depth_stencil_state_bo =
 159          depth_stencil_state_create_from_key(brw, &key);
 160 }
 161
 162 const struct brw_tracked_state gen6_depth_stencil_state = {
 163    .dirty = {
 164       .mesa = _NEW_DEPTH | _NEW_STENCIL,
 165       .brw = 0,
 166       .cache = 0,
 167    },
 168    .prepare = prepare_depth_stencil_state,
 169 };