refactor to allow various gfx backends (work-in-progress)

btgui/OpenGLWindow/SimpleCamera.h

@@ -0,0 +1,36 @@
+#ifndef SIMPLE_CAMERA_H
+#define SIMPLE_CAMERA_H
+
+struct CommonCameraInterface
+{
+	virtual void getCameraProjectionMatrix(float m[16])const = 0;
+	virtual void getCameraViewMatrix(float m[16]) const = 0;
+};
+
+struct SimpleCamera : public CommonCameraInterface
+{
+	struct SimpleCameraInternalData* m_data;
+
+	SimpleCamera();
+	virtual ~SimpleCamera();
+
+	void update();
+	virtual void getCameraProjectionMatrix(float m[16]) const;
+	virtual void getCameraViewMatrix(float m[16]) const;
+	
+	virtual void getCameraTargetPosition(float pos[3]) const;
+	virtual void getCameraPosition(float pos[3]) const;
+
+	virtual void	setCameraTargetPosition(float x,float y,float z);
+	virtual void	setCameraDistance(float dist);
+	virtual void	setCameraUpVector(float x,float y, float z);
+	///the setCameraUpAxis will call the 'setCameraUpVector' and 'setCameraForwardVector'
+	virtual void	setCameraUpAxis(int axis);
+	virtual void	setCameraYaw(float yaw);
+	
+	virtual void	setCameraPitch(float pitch);
+	virtual void	setAspectRatio(float ratio);
+
+};
+
+#endif //SIMPLE_CAMERA_H