add initial examples, replacing the 'Demos/Demos3'. Will make it work cross-platform, OpenGL3/OpenGL2 and add more examples to it.

examples/OpenGLWindow/SimpleOpenGL2App.h

@@ -0,0 +1,35 @@
+#ifndef SIMPLE_OPENGL2_APP_H
+#define SIMPLE_OPENGL2_APP_H
+
+#include "../CommonInterfaces/CommonGraphicsAppInterface.h"
+
+class SimpleOpenGL2App : public CommonGraphicsApp
+{
+protected:
+	struct SimpleOpenGL2AppInternalData*	m_data;
+
+public:
+	SimpleOpenGL2App(const char* title, int width, int height);
+	virtual ~SimpleOpenGL2App();
+
+	virtual void drawGrid(DrawGridData data=DrawGridData());
+	virtual void setUpAxis(int axis);
+	virtual int getUpAxis() const;
+	
+	virtual void swapBuffer();
+	virtual void drawText( const char* txt, int posX, int posY);
+
+	virtual int	registerCubeShape(float halfExtentsX,float halfExtentsY, float halfExtentsZ)
+	{
+		return 0;
+	}
+	virtual int	registerGraphicsSphereShape(float radius, bool usePointSprites, int largeSphereThreshold, int mediumSphereThreshold)
+	{
+		return 0;
+	}
+    virtual void drawText3D( const char* txt, float posX, float posZY, float posZ, float size);
+    virtual void registerGrid(int xres, int yres, float color0[4], float color1[4]);
+
+    
+};
+#endif //SIMPLE_OPENGL2_APP_H