#include "Camera.h"
#include <DirectXMath.h>

using namespace DirectX;

UINT Camera::init(UINT width, UINT height)
{
    // view matrix
    XMVECTOR position = XMVectorSet(0.0f, 0.0f, -2.0f, 0.0f); // camera position
    XMVECTOR forward = XMVectorSet(0.0f, 0.0f, 1.0f, 0.0f); // camera forward vector
    XMVECTOR up = XMVectorSet(0.0f, 1.0f, 0.0f, 0.0f); // camera up vector

    XMMATRIX viewMatrix = XMMatrixLookToLH(position, forward, up);
    XMStoreFloat4x4(reinterpret_cast<XMFLOAT4X4*>(&_viewMatrix), viewMatrix);

    // projection matrix
    FLOAT fov = XM_PI * 0.3333333f; // field of view angle in radians
    FLOAT aspectRatio = static_cast<FLOAT>(width) / static_cast<FLOAT>(height); // CAUTION: UINT / UINT => UINT
    FLOAT nearClippingPlane = 0.3f;
    FLOAT farClippingPlane = 20.0f;

    XMMATRIX projectionMatrix = XMMatrixPerspectiveFovLH(fov, aspectRatio, nearClippingPlane, farClippingPlane);
    XMStoreFloat4x4(reinterpret_cast<XMFLOAT4X4*>(&_projectionMatrix), projectionMatrix);

    return 0;
}

void Camera::update(FLOAT dt, IDirect3DDevice9* pD3DDevice)
{
    pD3DDevice->SetTransform(D3DTS_VIEW, &_viewMatrix);
    pD3DDevice->SetTransform(D3DTS_PROJECTION, &_projectionMatrix);
}

void Camera::deInit()
{
}