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