#pragma once
#include <glm/glm.hpp>
#include <glm/gtc/matrix_transform.hpp>
#include "util.h"


struct camera
{
	float hAngle;
	float vAngle;

	glm::vec3 position;
	glm::vec3 forward;
	glm::vec3 up;
	glm::vec3 left;
	glm::vec3 target;
	glm::vec3 world_up;

	glm::mat4 model;
	glm::mat4 view;
	glm::mat4 projection;
	glm::mat4 MVP;
};

enum projection_type
{
	PERSPECTIVE,
	ORTHOGRAPHIC,
};


v2f
cameraUnproject(camera& cam, int x, int y, int vp_width, int vp_height);

v3f
cameraCreateRay(camera& cam, v2i vp_coords, v2i vp_dims);

bool
cameraIntersectPlane(camera& cam,
	v3f ray,
	v3f plane_origin,
	v3f plane_normal,
	v3f& intersection);

void
cameraInitPerspective(camera& cam,
	glm::vec3 position,
	glm::vec3 target,
	glm::vec3 world_up,
	float aspect_ratio = 16.f / 9.f);

void
cameraMove(camera& cam,
	bool up,
	bool left,
	bool down,
	bool right,
	bool forward,
	bool backward);

void
cameraRotate(camera& cam, int32	xrel, int32 yrel);

void
cameraRoll(camera& cam, bool CW, bool CCW);