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
transferToCache()15 void GrStencilBuffer::transferToCache() {
16 SkASSERT(NULL == this->getCacheEntry());
17
18 this->getGpu()->getContext()->addStencilBuffer(this);
19 }
20
21 namespace {
22 // 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)23 void gen_cache_id(int width, int height, int sampleCnt, GrCacheID* cacheID) {
24 static const GrCacheID::Domain gStencilBufferDomain = GrCacheID::GenerateDomain();
25 GrCacheID::Key key;
26 uint32_t* keyData = key.fData32;
27 keyData[0] = width;
28 keyData[1] = height;
29 keyData[2] = sampleCnt;
30 memset(keyData + 3, 0, sizeof(key) - 3 * sizeof(uint32_t));
31 GR_STATIC_ASSERT(sizeof(key) >= 3 * sizeof(uint32_t));
32 cacheID->reset(gStencilBufferDomain, key);
33 }
34 }
35
ComputeKey(int width,int height,int sampleCnt)36 GrResourceKey GrStencilBuffer::ComputeKey(int width,
37 int height,
38 int sampleCnt) {
39 // All SBs are created internally to attach to RTs so they all use the same domain.
40 static const GrResourceKey::ResourceType gStencilBufferResourceType =
41 GrResourceKey::GenerateResourceType();
42 GrCacheID id;
43 gen_cache_id(width, height, sampleCnt, &id);
44
45 // we don't use any flags for SBs currently.
46 return GrResourceKey(id, gStencilBufferResourceType, 0);
47 }
48