Diligent Engine API Reference
GLContext.h
1 /*
2  * Copyright 2013 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 //--------------------------------------------------------------------------------
18 // GLContext.h
19 //--------------------------------------------------------------------------------
20 #ifndef GLCONTEXT_H_
21 #define GLCONTEXT_H_
22 
23 #include <EGL/egl.h>
24 #include <GLES2/gl2.h>
25 #include <android/log.h>
26 
27 #include "JNIHelper.h"
28 
29 namespace ndk_helper {
30 
31 //--------------------------------------------------------------------------------
32 // Constants
33 //--------------------------------------------------------------------------------
34 
35 //--------------------------------------------------------------------------------
36 // Class
37 //--------------------------------------------------------------------------------
38 
39 /******************************************************************
40  * OpenGL context handler
41  * The class handles OpenGL and EGL context based on Android activity life cycle
42  * The caller needs to call corresponding methods for each activity life cycle
43  *events as it's done in sample codes.
44  *
45  * Also the class initializes OpenGL ES3 when the compatible driver is installed
46  *in the device.
47  * getGLVersion() returns 3.0~ when the device supports OpenGLES3.0
48  *
49  * Thread safety: OpenGL context is expecting used within dedicated single
50  *thread,
51  * thus GLContext class is not designed as a thread-safe
52  */
53 class GLContext {
54  private:
55  // EGL configurations
56  ANativeWindow* window_;
57  EGLDisplay display_;
58  EGLSurface surface_;
59  EGLContext context_;
60  EGLConfig config_;
61 
62  // Screen parameters
63  int32_t screen_width_;
64  int32_t screen_height_;
65  int32_t color_size_;
66  int32_t depth_size_;
67 
68  // Flags
69  bool gles_initialized_;
70  bool egl_context_initialized_;
71  bool es3_supported_;
72  float gl_version_;
73  bool context_valid_;
74 
75  void InitGLES();
76  void Terminate();
77  bool InitEGLSurface();
78  bool InitEGLContext();
79 
80  GLContext(GLContext const&);
81  void operator=(GLContext const&);
82  GLContext();
83  virtual ~GLContext();
84 
85  public:
86  static GLContext* GetInstance() {
87  // Singleton
88  static GLContext instance;
89 
90  return &instance;
91  }
92 
93  bool Init(ANativeWindow* window);
94  EGLint Swap();
95  bool Invalidate();
96 
97  void Suspend();
98  EGLint Resume(ANativeWindow* window);
99 
100  ANativeWindow* GetANativeWindow(void) const { return window_; };
101  int32_t GetScreenWidth() const { return screen_width_; }
102  int32_t GetScreenHeight() const { return screen_height_; }
103 
104  int32_t GetBufferColorSize() const { return color_size_; }
105  int32_t GetBufferDepthSize() const { return depth_size_; }
106  float GetGLVersion() const { return gl_version_; }
107  bool CheckExtension(const char* extension);
108 
109  EGLDisplay GetDisplay() const { return display_; }
110  EGLSurface GetSurface() const { return surface_; }
111 };
112 
113 } // namespace ndkHelper
114 
115 #endif /* GLCONTEXT_H_ */
ndk_helper
Definition: gestureDetector.h:32