#pragma once

#include <glm/glm.hpp>

#include "types.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;
};


// FIXME: we should keep to our convention of passing pointers to structs in
// 	these interface functions
glm::vec2
cameraUnproject(Camera& cam, int x, int y, int vp_width, int vp_height);

glm::vec3
cameraCreateRay(Camera& cam, glm::ivec2 vp_coords, glm::ivec2 vp_dims);

bool
cameraIntersectPlane(Camera& cam,
	glm::vec3 ray,
	glm::vec3 plane_origin,
	glm::vec3 plane_normal,
	glm::vec3& 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, i32	xrel, i32 yrel);

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