#include "UnitTestSharpHLSL.fx"
#include "QuincunxSampling.fxh"

// QuincunxSampling_ComputeSamplingPoints

void ComputeSamplingPoints_Identity()
{
	float2x4 expected = {
		1, -1, -1, 1,
		1, 1, -1, -1,
	};
	
	float4x4 WCV_Inv = {
		1, 0, 0, 0,
		0, 1, 0, 0,
		0, 0, 0, 0,
		0, 0, 0, 1,
	};

	float2 pixelCenter = float2(0, 0);
	float pixelHalfWidth = 1;
	
	float2x4 actual = QuincunxSampling_ComputeSamplingPoints(WCV_Inv, pixelCenter, pixelHalfWidth);
	
	CheckEqual(expected, actual);
}

void ComputeSamplingPoints_Wide()
{
	float2x4 expected = {
		2, -2, -2, 2,
		2, 2, -2, -2,
	};
	
	float4x4 WCV_Inv = {
		1, 0, 0, 0,
		0, 1, 0, 0,
		0, 0, 0, 0,
		0, 0, 0, 1,
	};

	float2 pixelCenter = float2(0, 0);
	float pixelHalfWidth = 2;
	
	float2x4 actual = QuincunxSampling_ComputeSamplingPoints(WCV_Inv, pixelCenter, pixelHalfWidth);
	
	CheckEqual(expected, actual);
}

void ComputeSamplingPoints_Symmetric()
{
	float2x4 expected = {
		4, 2, -2, 0,
		5, 1, -1, 3,
	};
	
	float4x4 WCV_Inv = {
		1, 2, 0, 1,
		2, 1, 0, 2,
		0, 0, 0, 0,
		1, 2, 0, 1,
	};

	float2 pixelCenter = float2(0, 0);
	float pixelHalfWidth = 1;
	
	float2x4 actual = QuincunxSampling_ComputeSamplingPoints(WCV_Inv, pixelCenter, pixelHalfWidth);
	
	CheckEqual(expected, actual);
}

void ComputeSamplingPoints_RealWorld()
{
	float2x4 expected = {
		-7, -8, -11, -10,
		6, 4, 3, 5,
	};
	
	float4x4 WCV_Inv = {
		1, 2, 0, 0,
		3, 1, 0, 0,
		0, 0, 0, 0,
		1, 2, 0, 1,
	};

	float2 pixelCenter = float2(3.5, -4.5);
	float pixelHalfWidth = 0.5;
	
	float2x4 actual = QuincunxSampling_ComputeSamplingPoints(WCV_Inv, pixelCenter, pixelHalfWidth);
	
	//expected = transpose(expected);
	//actual = transpose(actual);
	
	CheckEqual(expected, actual);
}

//QuincunxSampling_IsInsideCircle

void IsInsideCircle_Complete()
{
	
}