cleaned code, added pinch gesture detector, better opengl context handling, fixed issues

Change-Id: I26a28374ae74391204586b4584d03cf0c58772c2

ndk/sources/android/helper/GLContext.h

@@ -0,0 +1,104 @@
+/*
+ * 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 <android/sensor.h>
+#include <android/log.h>
+#include <android_native_app_glue.h>
+#include <android/native_window_jni.h>
+#include "JNIHelper.h"
+
+//--------------------------------------------------------------------------------
+// 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
+ */
+class GLContext
+{
+private:
+    //ELG configurations
+    ANativeWindow* _window;
+    EGLDisplay _display;
+    EGLSurface _surface;
+    EGLContext _context;
+    EGLConfig _config;
+
+    //Screen parameters
+    int32_t _iWidth;
+    int32_t _iHeight;
+    int32_t _iColorSize;
+    int32_t _iDepthSize;
+
+    //Flags
+    bool _bGLESInitialized;
+    bool _bEGLContextInitialized;
+    bool _bES3Support;
+    float _fGLVersion;
+
+    void initGLES();
+    bool _bContextValid;
+    void terminate();
+    bool initEGLSurface();
+    bool initEGLContext();
+public:
+    static GLContext* getInstance()
+    {
+        //Singleton
+        static GLContext instance;
+
+        return &instance;
+    }
+
+    GLContext( GLContext const& );
+    void operator=( GLContext const& );
+
+    GLContext();
+    virtual ~GLContext();
+
+    bool init( ANativeWindow* window );
+    EGLint swap();
+    bool invalidate();
+
+    void suspend();
+    EGLint resume(ANativeWindow* window);
+
+    int32_t getScreenWidth() { return _iWidth; }
+    int32_t getScreenHeight() { return _iHeight; }
+
+    int32_t getBufferColorSize() { return _iColorSize; }
+    int32_t getBufferDepthSize() { return _iDepthSize; }
+    float getGLVersion() { return _fGLVersion; }
+    bool checkExtension( const char* extension );
+};
+
+#endif /* GLCONTEXT_H_ */