#pragma once
#include "RenderingRun.h"

/**
	@brief Base abstract class __declspec( dllexport ) that defines a rendering process of a particle system impostor image.

	This impostor can be used as a texture for ither particle systems. This rendering method is called hieararchical particle system.
*/
class __declspec( dllexport ) ChildPsystemRenderingRun : virtual public RenderingRun
{	
public:
	/**
		@brief Constructor.

		@param resolution               the resolution of the impostor image
		@param perspectiveRendering		sets if the impostor should be rendered with a perspective projection or orthogonal
		@param startFrame				adds an offset to the current frame number to help evenly distribute updates between frames
		@param updateInterval			update frequency
	*/
	ChildPsystemRenderingRun(
							unsigned int resolution,
							bool perspectiveRendering,
							unsigned long startFrame,
							unsigned long updateInterval)
							:RenderingRun(startFrame, updateInterval)
	{
		this->resolution = resolution;
		this->perspectiveRendering = perspectiveRendering;
	}

	virtual ~ChildPsystemRenderingRun(){}

protected:
	/**
		@brief the resolution of the impostor image
	*/
	unsigned int resolution;
	/**
		@brief sets if the impostor should be rendered with a perspective projection or orthogonal
	*/
	bool perspectiveRendering;
    //inherited
	virtual void updateFrame(unsigned long frameNum) = 0;	
	/**
		@brief Creates an impostor texture that can be used as a rendertarget during impostor rendering.
	*/
	virtual inline void createImpostorTexture() = 0;	
};