1/*
2 * Copyright (C) 2012 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
17#include <gui/GLConsumer.h>
18#include <gui/Surface.h>
19#include <gui/SurfaceControl.h>
20
21#include <EGL/egl.h>
22#include <GLES2/gl2.h>
23
24namespace android {
25
26class SurfaceComposerClient;
27class SurfaceControl;
28
29enum { MAX_SHADER_LINES = 128 };
30
31struct ShaderDesc {
32    const char* name;
33    const char* vertexShader[MAX_SHADER_LINES];
34    const char* fragmentShader[MAX_SHADER_LINES];
35};
36
37class GLHelper {
38
39public:
40
41    enum { DITHER_KERNEL_SIZE = 4 };
42
43    GLHelper();
44
45    ~GLHelper();
46
47    bool setUp(const ShaderDesc* shaderDescs, size_t numShaders);
48
49    void tearDown();
50
51    bool makeCurrent(EGLSurface surface);
52
53    bool createSurfaceTexture(uint32_t w, uint32_t h,
54            sp<GLConsumer>* surfaceTexture, EGLSurface* surface,
55            GLuint* name);
56
57    bool createWindowSurface(uint32_t w, uint32_t h,
58            sp<SurfaceControl>* surfaceControl, EGLSurface* surface);
59
60    void destroySurface(EGLSurface* surface);
61
62    bool swapBuffers(EGLSurface surface);
63
64    bool getShaderProgram(const char* name, GLuint* outPgm);
65
66    bool getDitherTexture(GLuint* outTexName);
67
68private:
69
70    bool createNamedSurfaceTexture(GLuint name, uint32_t w, uint32_t h,
71            sp<GLConsumer>* surfaceTexture, EGLSurface* surface);
72
73    bool computeWindowScale(uint32_t w, uint32_t h, float* scale);
74
75    bool setUpShaders(const ShaderDesc* shaderDescs, size_t numShaders);
76
77    EGLDisplay mDisplay;
78    EGLContext mContext;
79    EGLSurface mDummySurface;
80    sp<GLConsumer> mDummyGLConsumer;
81    EGLConfig mConfig;
82
83    sp<SurfaceComposerClient> mSurfaceComposerClient;
84
85    GLuint* mShaderPrograms;
86    const ShaderDesc* mShaderDescs;
87    size_t mNumShaders;
88
89    GLuint mDitherTexture;
90};
91
92} // namespace android
93