//
//  Created by Bradley Austin Davis on 2015/06/12
//  Copyright 2015 High Fidelity, Inc.
//
//  Distributed under the Apache License, Version 2.0.
//  See the accompanying file LICENSE or http://www.apache.org/licenses/LICENSE-2.0.html
//
#pragma once

#include <openvr.h>
#include <GLMHelpers.h>
#include <glm/gtc/type_ptr.hpp>
#include <glm/gtc/matrix_transform.hpp>

vr::IVRSystem* acquireOpenVrSystem();
void releaseOpenVrSystem();

template<typename F>
void openvr_for_each_eye(F f) {
    f(vr::Hmd_Eye::Eye_Left);
    f(vr::Hmd_Eye::Eye_Right);
}

inline mat4 toGlm(const vr::HmdMatrix44_t& m) {
    return glm::transpose(glm::make_mat4(&m.m[0][0]));
}

inline vec3 toGlm(const vr::HmdVector3_t& v) {
    return vec3(v.v[0], v.v[1], v.v[2]);
}

inline mat4 toGlm(const vr::HmdMatrix34_t& m) {
    mat4 result = mat4(
        m.m[0][0], m.m[1][0], m.m[2][0], 0.0,
        m.m[0][1], m.m[1][1], m.m[2][1], 0.0,
        m.m[0][2], m.m[1][2], m.m[2][2], 0.0,
        m.m[0][3], m.m[1][3], m.m[2][3], 1.0f);
    return result;
}