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/*
* Copyright 2013 The Android Open Source Project
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
//--------------------------------------------------------------------------------
// GLContext.h
//--------------------------------------------------------------------------------
#ifndef GLCONTEXT_H_
#define GLCONTEXT_H_
#include <EGL/egl.h>
#include <GLES2/gl2.h>
#include <android/log.h>
#include "JNIHelper.h"
namespace ndk_helper
{
//--------------------------------------------------------------------------------
// Constants
//--------------------------------------------------------------------------------
//--------------------------------------------------------------------------------
// Class
//--------------------------------------------------------------------------------
/******************************************************************
* OpenGL context handler
* The class handles OpenGL and EGL context based on Android activity life cycle
* The caller needs to call corresponding methods for each activity life cycle events as it's done in sample codes.
*
* Also the class initializes OpenGL ES3 when the compatible driver is installed in the device.
* getGLVersion() returns 3.0~ when the device supports OpenGLES3.0
*
* Thread safety: OpenGL context is expecting used within dedicated single thread,
* thus GLContext class is not designed as a thread-safe
*/
class GLContext
{
private:
//EGL configurations
ANativeWindow* window_;
EGLDisplay display_;
EGLSurface surface_;
EGLContext context_;
EGLConfig config_;
//Screen parameters
int32_t screen_width_;
int32_t screen_height_;
int32_t color_size_;
int32_t depth_size_;
//Flags
bool gles_initialized_;
bool egl_context_initialized_;
bool es3_supported_;
float gl_version_;
bool context_valid_;
void InitGLES();
void Terminate();
bool InitEGLSurface();
bool InitEGLContext();
GLContext( GLContext const& );
void operator=( GLContext const& );
GLContext();
virtual ~GLContext();
public:
static GLContext* GetInstance()
{
//Singleton
static GLContext instance;
return &instance;
}
bool Init( ANativeWindow* window );
EGLint Swap();
bool Invalidate();
void Suspend();
EGLint Resume( ANativeWindow* window );
int32_t GetScreenWidth()
{
return screen_width_;
}
int32_t GetScreenHeight()
{
return screen_height_;
}
int32_t GetBufferColorSize()
{
return color_size_;
}
int32_t GetBufferDepthSize()
{
return depth_size_;
}
float GetGLVersion()
{
return gl_version_;
}
bool CheckExtension( const char* extension );
};
} //namespace ndkHelper
#endif /* GLCONTEXT_H_ */
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