Graphics-Lesson/ToCam.cpp at main · NighthowlerStudios/Graphics-Lesson · GitHub

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#include "ToCam.h"

ToCam::ToCam(XMFLOAT3 position, XMFLOAT3 at, XMFLOAT3 up, FLOAT windowWidth, FLOAT windowHeight, FLOAT nearDepth, FLOAT farDepth) {
	_eye = position;
	_at = at;
	_up = up;

	_windowWidth = windowWidth;
	_windowHeight = windowHeight;
	_nearDepth = nearDepth;
	_farDepth = farDepth;

	//initialize the view matrix default
	UpdateView();

	//initialize the projection matrix
	Reshape(_windowWidth, _windowHeight, _nearDepth, _farDepth);
}

void ToCam::UpdateView()
{
	XMVECTOR posVec = XMVectorSet(_eye.x, _eye.y, _eye.z, 0.0f);
	XMVECTOR atVec = XMVectorSet(_at.x, _at.y, _at.z, 0.0f);
	XMVECTOR upVec = XMVectorSet(_up.x, _up.y, _up.z, 0.0f);

	XMStoreFloat4x4(&_view, XMMatrixLookToLH(posVec, atVec, upVec));
}

void ToCam::Update(Input* nextInput, float deltaT)
{
	const float movementSpeed = 5.0f;

	_distance = 0.0f;
	_strafe = 0.0f;

	//zoom
	if (nextInput->KeyWDown()) {
		_distance = deltaT * movementSpeed;
	}
	if (nextInput->KeySDown()) {
		_distance = -(deltaT * movementSpeed);
	}

	//rotate
	if (nextInput->KeyADown()) {
		_strafe = -(deltaT * movementSpeed);
	}
	if (nextInput->KeyDDown()) {
		_strafe = deltaT * movementSpeed;
	}

	XMVECTOR posVec = XMVectorSet(_eye.x, _eye.y, _eye.z, 0.0f);
	XMVECTOR atVec = XMVectorSet(_at.x, _at.y, _at.z, 0.0f);
	posVec += XMVector4Normalize(atVec) * _distance;
	posVec += XMVectorSet(_strafe, 0.0f, 0.0f, 0.0f);
	XMStoreFloat3(&_eye, posVec);

	UpdateView();
}