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
15void GrStencilBuffer::transferToCache() {
16    SkASSERT(NULL == this->getCacheEntry());
17
18    this->getGpu()->getContext()->addStencilBuffer(this);
19}
20
21namespace {
22// we should never have more than one stencil buffer with same combo of (width,height,samplecount)
23void 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
36GrResourceKey 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