EglManager.h revision d04794a9a3f9edc8b7ca336175d66eb81a8f55fa 
1/*
2 * Copyright (C) 2014 The Android Open Source Project
3 *
4 * Licensed under the Apache License, Version 2.0 (the "License");
5 * you may not use this file except in compliance with the License.
6 * You may obtain a copy of the License at
7 *
8 *      http://www.apache.org/licenses/LICENSE-2.0
9 *
10 * Unless required by applicable law or agreed to in writing, software
11 * distributed under the License is distributed on an "AS IS" BASIS,
12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13 * See the License for the specific language governing permissions and
14 * limitations under the License.
15 */
16#ifndef EGLMANAGER_H
17#define EGLMANAGER_H
18
19#include <cutils/compiler.h>
20#include <EGL/egl.h>
21#include <SkRect.h>
22#include <ui/GraphicBuffer.h>
23#include <utils/StrongPointer.h>
24
25namespace android {
26namespace uirenderer {
27namespace renderthread {
28
29class RenderThread;
30
31// This class contains the shared global EGL objects, such as EGLDisplay
32// and EGLConfig, which are re-used by CanvasContext
33class EglManager {
34public:
35    // Returns true on success, false on failure
36    void initialize();
37
38    bool hasEglContext();
39    void requireGlContext();
40
41    void usePBufferSurface();
42    EGLSurface createSurface(EGLNativeWindowType window);
43    void destroySurface(EGLSurface surface);
44
45    void destroy();
46
47    bool isCurrent(EGLSurface surface) { return mCurrentSurface == surface; }
48    // Returns true if the current surface changed, false if it was already current
49    bool makeCurrent(EGLSurface surface);
50    void beginFrame(EGLSurface surface, EGLint* width, EGLint* height);
51    bool swapBuffers(EGLSurface surface, const SkRect& dirty, EGLint width, EGLint height);
52    void cancelFrame();
53
54    // Returns true iff the surface is now preserving buffers.
55    bool setPreserveBuffer(EGLSurface surface, bool preserve);
56
57    void setTextureAtlas(const sp<GraphicBuffer>& buffer, int64_t* map, size_t mapSize);
58
59    void fence();
60
61private:
62    friend class RenderThread;
63
64    EglManager(RenderThread& thread);
65    // EglContext is never destroyed, method is purposely not implemented
66    ~EglManager();
67
68    void loadConfig();
69    void createContext();
70    void initAtlas();
71
72    RenderThread& mRenderThread;
73
74    EGLDisplay mEglDisplay;
75    EGLConfig mEglConfig;
76    EGLContext mEglContext;
77    EGLSurface mPBufferSurface;
78
79    const bool mAllowPreserveBuffer;
80    bool mCanSetPreserveBuffer;
81
82    EGLSurface mCurrentSurface;
83
84    sp<GraphicBuffer> mAtlasBuffer;
85    int64_t* mAtlasMap;
86    size_t mAtlasMapSize;
87
88    // Whether or not we are in the middle of drawing a frame. This is used
89    // to avoid switching surfaces mid-frame if requireGlContext() is called
90    // TODO: Need to be better about surface/context management so that this isn't
91    // necessary
92    bool mInFrame;
93};
94
95} /* namespace renderthread */
96} /* namespace uirenderer */
97} /* namespace android */
98
99#endif /* EGLMANAGER_H */
100