refactor app and enable gles 3.0

engine/pch.h

@@ -3,9 +3,18 @@
 #ifdef __APPLE__
     #include <OpenGL/gl3.h>
     #include <sys/stat.h>
+    #define LOG printf
 #elif __ANDROID__
+    #include <EGL/egl.h>
 	#include <GLES3/gl3.h>
     #include <sys/stat.h>
+
+    #include <android/sensor.h>
+    #include <android/log.h>
+    #include <android_native_app_glue.h>
+
+    #define LOG(...) ((void)__android_log_print(ANDROID_LOG_INFO, "native-engine", __VA_ARGS__))
+
 #elif _WIN32
     #define _USE_MATH_DEFINES
     #define _CRT_SECURE_NO_WARNINGS
@@ -13,6 +22,8 @@
     #include <gl\glew.h>
     #include <gl\wglew.h>
     #include <gl\GL.h>
+    
+    #define LOG printf
 #endif
 
 #ifdef __cplusplus