charcoal/OpenGLEngine/Camera3D.h

#pragma once

#include "Camera.h"

#include <glm/glm.hpp>

namespace charcoal
{
	using namespace glm;

	class Camera3D : public Camera
	{
	public:
		Camera3D(
			float fov_y,
			float aspect_ratio,
			float znear,
			float zfar,
			const vec3& position,
			const vec3& forward = vec3(0.0f, 0.0f, -1.0f),
			const vec3& up = vec3(0.0f, 1.0f, 0.0f),
			const vec3& right = vec3(0.0f) // Zero for auto-calculated
		);

		void update_frustum(float fov_y, float aspect_ratio, float znear, float zfar);
		void update_position(const vec3& position);
		// Updates the orientation based on three vectors.
		// If right is equal to zero it is calculated with glm::cross(forward, up).
		// Then the true up is calculated with glm::cross(right, forward)
		void update_orientation(const vec3& forward = vec3(0.0f, 0.0f, -1.0f), const vec3& up = vec3(0.0f, 1.0f, 0.0f), const vec3& right = vec3(0.0f));
		// Directly sets the forward, up, and right values.
		void direct_update_orientation(const vec3& forward, const vec3& up, const vec3& right);

		void translate(const vec3& translation);
		void rotate(const vec3& axis, float angle);

		void prerender();

		const vec3& get_position() const { return m_position; }
		vec3 get_forward() const { return vec3(m_forward); }
		vec3 get_up() const { return vec3(m_up); }
		vec3 get_right() const { return vec3(m_right); }

	private:
		vec4 m_forward;
		vec4 m_up;
		vec4 m_right;
	};
}