зеркало из https://github.com/mozilla/gecko-dev.git
43 строки
1.6 KiB
C++
43 строки
1.6 KiB
C++
/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
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/* vim: set ts=8 sts=2 et sw=2 tw=80: */
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/* This Source Code Form is subject to the terms of the Mozilla Public
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* License, v. 2.0. If a copy of the MPL was not distributed with this file,
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* You can obtain one at http://mozilla.org/MPL/2.0/. */
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#include "XRNativeOriginLocalFloor.h"
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namespace mozilla {
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namespace dom {
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XRNativeOriginLocalFloor::XRNativeOriginLocalFloor(VRDisplayClient* aDisplay)
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: mDisplay(aDisplay), mInitialPositionValid(false) {
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MOZ_ASSERT(aDisplay);
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// To avoid fingerprinting, we offset the floor height by 5cm.
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// This will always result in the floor being lower than the
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// real floor in order to avoid breaking content that expects
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// you to pick objects up off the floor.
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//
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// TODO (Bug 1616394) - Convert this constant to a pref.
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const double kFloorFuzz = 0.05f; // Meters
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mFloorRandom = double(rand()) / double(RAND_MAX) * kFloorFuzz;
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}
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gfx::PointDouble3D XRNativeOriginLocalFloor::GetPosition() {
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// Keep returning {0,-fuzz,0} until a position can be found
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const auto standing =
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mDisplay->GetDisplayInfo().GetSittingToStandingTransform();
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if (!mInitialPositionValid || standing != mStandingTransform) {
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const gfx::VRHMDSensorState& sensorState = mDisplay->GetSensorState();
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mInitialPosition.x = sensorState.pose.position[0];
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mInitialPosition.y = -mFloorRandom - standing._42;
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mInitialPosition.z = sensorState.pose.position[2];
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mInitialPositionValid = true;
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mStandingTransform = standing;
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}
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return mInitialPosition;
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}
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} // namespace dom
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} // namespace mozilla
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