Android Build Tools

Android/android-ndk-r27d/sources/android/ndk_helper/GLContext.h

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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.
+ */
+
+#pragma once
+
+#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