Viewport.h
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Viewport.h
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	#ifndef _ECHOVIEWPORT_H_
	#define _ECHOVIEWPORT_H_

	#include <echo/Types.h>
	#include <echo/Graphics/Colour.h>

	namespace Echo
	{
	//!\breif Viewport
	class Viewport
	{
	public:
	struct AspectRatioOptions
	{
	enum _
	{
	NONE,
	HORIZONTAL_FIXED,
	VERTICAL_FIXED
	};
	};
	typedef AspectRatioOptions::_ AspectRatioOption;

	Viewport(f32 left=0.0f, f32 top=0.0f, f32 right=1.0f, f32 bottom=1.0f, AspectRatioOption aspectRatioOption = AspectRatioOptions::NONE) :
	mAspectRatioOption(aspectRatioOption)
	{
	SetViewport(left,top,right,bottom);
	}
	~Viewport()
	{
	}

	void SetViewport(f32 left=0.0f, f32 top=0.0f, f32 right=1.0f, f32 bottom=1.0f)
	{
	mLeft=left;
	mRight=right;
	mTop=top;
	mBottom=bottom;
	mAspectRatio = (right-left) / (bottom-top);
	}

	f32 GetLeft() const;
	f32 GetRight() const;
	f32 GetTop() const;
	f32 GetBottom() const;
	const f32& GetAspectRatio() const {return mAspectRatio;}
	private:
	f32 mLeft;
	f32 mRight;
	f32 mTop;
	f32 mBottom;
	f32 mAspectRatio;
	AspectRatioOption mAspectRatioOption;
	};
	}
	#endif