blob: 6a6297a67fb0b06969ee32337b8f339f07f40f64 [file] [log] [blame]
// Copyright 2017 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#include "ui/gfx/geometry/vector3d_f.h"
namespace gfx {
class Transform;
namespace vr {
// Provides the direction the head is looking towards as a 3x1 unit vector.
gfx::Vector3dF GetForwardVector(const gfx::Transform& head_pose);
// Returns a vector heading upward from the viewer's head.
gfx::Vector3dF GetUpVector(const gfx::Transform& head_pose);
// Returns true if either the change is gaze direction (via GetForwardVector
// above) exceeds the angular threshold, or if the change in up vector exceeds
// this same threshold.
bool HeadMoveExceedsThreshold(const gfx::Transform& old_pose,
const gfx::Transform& new_pose,
float angular_threshold_degrees);
} // namespace vr