#pragma once

#include "Math/Mat44.hpp"
#include <cmath>




struct Camera
{
	Mat44 projectionTransform;


	static Mat44 MakeProjectionTransform(float fov, float nearClip, float farClip, unsigned int viewWidth, unsigned int viewHeight)
	{
		float zClipBias0 =
			(farClip + nearClip)
			/ (farClip - nearClip);

		float zClipBias1 =
			(2.0f * farClip * nearClip)
			/ (farClip - nearClip);

		float zoomX = 1.0f / tanf((fov / 2.0f) * (M_PI / 180.0f));
		float zoomY = (zoomX * static_cast<float>(viewWidth)) / static_cast<float>(viewHeight);

		Mat44 transform;
		transform.m[0][0] = zoomX;
		transform.m[1][1] = zoomY;
		transform.m[2][2] = -zClipBias0;
		transform.m[3][2] = -1;
		transform.m[2][3] = -zClipBias1;

		return transform;
	}
};