RenderTarget.cpp
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RenderTarget.cpp
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	#include <echo/Graphics/RenderTarget.h>

	namespace Echo
	{
	RenderTarget::RenderTarget()
	{
	mCurrentViewport = 0;
	mIsPrimary = false;
	mIsFullScreen = false;
	mDisplayXDPI = 0.f; //Display X DPI, 0 if unknown
	mDisplayYDPI = 0.f; //Display Y DPI, 0 if unknown
	}

	RenderTarget::~RenderTarget()
	{
	}

	f32 RenderTarget::GetAspectRatio() const
	{
	return (static_cast<f32>(GetWidth()) / static_cast<f32>(GetHeight()));
	}

	Metre RenderTarget::GetDisplayPhysicalWidth() const
	{
	u32 widthInPixels = GetWidth();
	if(mDisplayXDPI == 0.f \|\| widthInPixels==0)
	{
	//We don't know.
	return Metre(0);
	}
	return Inch(widthInPixels / mDisplayXDPI);
	}

	Metre RenderTarget::GetDisplayPhysicalHeight() const
	{
	u32 heightInPixels = GetHeight();
	if(mDisplayYDPI == 0.f \|\| heightInPixels==0)
	{
	//We don't know.
	return Metre(0);
	}

	return Inch(heightInPixels / mDisplayYDPI);
	}

	Metre RenderTarget::GetDisplayPhysicalDiagonalSize() const
	{
	Metre width = GetDisplayPhysicalWidth();
	Metre height = GetDisplayPhysicalHeight();
	if(width==Metre(0) \|\| height==Metre(0))
	{
	return Metre(0);
	}
	return Metre(Maths::Hypotenuse(width.Count(),height.Count()));
	}

	}