1
2 /*
3 * Copyright 2011 Google Inc.
4 *
5 * Use of this source code is governed by a BSD-style license that can be
6 * found in the LICENSE file.
7 */
8
9 #include "GrStencilBuffer.h"
10
11 #include "GrContext.h"
12 #include "GrGpu.h"
13 #include "GrResourceCache.h"
14
SK_DEFINE_INST_COUNT(GrStencilBuffer)15 SK_DEFINE_INST_COUNT(GrStencilBuffer)
16
17 void GrStencilBuffer::transferToCache() {
18 GrAssert(NULL == this->getCacheEntry());
19
20 this->getGpu()->getContext()->addStencilBuffer(this);
21 }
22
23 namespace {
24 // we should never have more than one stencil buffer with same combo of (width,height,samplecount)
gen_cache_id(int width,int height,int sampleCnt,GrCacheID * cacheID)25 void gen_cache_id(int width, int height, int sampleCnt, GrCacheID* cacheID) {
26 static const GrCacheID::Domain gStencilBufferDomain = GrCacheID::GenerateDomain();
27 GrCacheID::Key key;
28 uint32_t* keyData = key.fData32;
29 keyData[0] = width;
30 keyData[1] = height;
31 keyData[2] = sampleCnt;
32 memset(keyData + 3, 0, sizeof(key) - 3 * sizeof(uint32_t));
33 GR_STATIC_ASSERT(sizeof(key) >= 3 * sizeof(uint32_t));
34 cacheID->reset(gStencilBufferDomain, key);
35 }
36 }
37
ComputeKey(int width,int height,int sampleCnt)38 GrResourceKey GrStencilBuffer::ComputeKey(int width,
39 int height,
40 int sampleCnt) {
41 // All SBs are created internally to attach to RTs so they all use the same domain.
42 static const GrResourceKey::ResourceType gStencilBufferResourceType =
43 GrResourceKey::GenerateResourceType();
44 GrCacheID id;
45 gen_cache_id(width, height, sampleCnt, &id);
46
47 // we don't use any flags for SBs currently.
48 return GrResourceKey(id, gStencilBufferResourceType, 0);
49 }
50