////  Created by Bradley Austin Davis on 2014/04/13.//  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//#include "OculusBaseDisplayPlugin.h" #include <ViewFrustum.h>#include <controllers/Pose.h>#include <display-plugins/CompositorHelper.h> #include "OculusHelpers.h" void OculusBaseDisplayPlugin::resetSensors() {    ovr_RecenterTrackingOrigin(_session);     _currentRenderFrameInfo.renderPose = glm::mat4(); // identity} bool OculusBaseDisplayPlugin::beginFrameRender(uint32_t frameIndex) {    _currentRenderFrameInfo = FrameInfo();    _currentRenderFrameInfo.sensorSampleTime = ovr_GetTimeInSeconds();;    _currentRenderFrameInfo.predictedDisplayTime = ovr_GetPredictedDisplayTime(_session, frameIndex);    auto trackingState = ovr_GetTrackingState(_session, _currentRenderFrameInfo.predictedDisplayTime, ovrTrue);    _currentRenderFrameInfo.renderPose = toGlm(trackingState.HeadPose.ThePose);    _currentRenderFrameInfo.presentPose = _currentRenderFrameInfo.renderPose;     std::array<glm::mat4, 2> handPoses;    // Make controller poses available to the presentation thread    ovr_for_each_hand([&](ovrHandType hand) {        static const auto REQUIRED_HAND_STATUS = ovrStatus_OrientationTracked & ovrStatus_PositionTracked;        if (REQUIRED_HAND_STATUS != (trackingState.HandStatusFlags[hand] & REQUIRED_HAND_STATUS)) {            return;        }         auto correctedPose = ovrControllerPoseToHandPose(hand, trackingState.HandPoses[hand]);        static const glm::quat HAND_TO_LASER_ROTATION = glm::rotation(Vectors::UNIT_Z, Vectors::UNIT_NEG_Y);        handPoses[hand] = glm::translate(glm::mat4(), correctedPose.translation) * glm::mat4_cast(correctedPose.rotation * HAND_TO_LASER_ROTATION);    });     withRenderThreadLock([&] {        _uiModelTransform = DependencyManager::get<CompositorHelper>()->getModelTransform();        _handPoses = handPoses;        _frameInfos[frameIndex] = _currentRenderFrameInfo;    });    return Parent::beginFrameRender(frameIndex);} bool OculusBaseDisplayPlugin::isSupported() const {    return oculusAvailable();} // DLL based display plugins MUST initialize GLEW inside the DLL code.void OculusBaseDisplayPlugin::customizeContext() {    glewExperimental = true;    GLenum err = glewInit();    glGetError(); // clear the potential error from glewExperimental    Parent::customizeContext();} bool OculusBaseDisplayPlugin::internalActivate() {    _session = acquireOculusSession();    if (!_session) {        return false;    }     _hmdDesc = ovr_GetHmdDesc(_session);     glm::uvec2 eyeSizes[2];    _viewScaleDesc.HmdSpaceToWorldScaleInMeters = 1.0f;     _ipd = 0;    ovr_for_each_eye([&](ovrEyeType eye) {        _eyeFovs[eye] = _hmdDesc.DefaultEyeFov[eye];        ovrEyeRenderDesc& erd = _eyeRenderDescs[eye] = ovr_GetRenderDesc(_session, eye, _eyeFovs[eye]);        ovrMatrix4f ovrPerspectiveProjection =            ovrMatrix4f_Projection(erd.Fov, DEFAULT_NEAR_CLIP, DEFAULT_FAR_CLIP, ovrProjection_ClipRangeOpenGL);        _eyeProjections[eye] = toGlm(ovrPerspectiveProjection);        _eyeOffsets[eye] = glm::translate(mat4(), toGlm(erd.HmdToEyeOffset));        eyeSizes[eye] = toGlm(ovr_GetFovTextureSize(_session, eye, erd.Fov, 1.0f));        _viewScaleDesc.HmdToEyeOffset[eye] = erd.HmdToEyeOffset;        _ipd += glm::abs(glm::length(toGlm(erd.HmdToEyeOffset)));    });     auto combinedFov = _eyeFovs[0];    combinedFov.LeftTan = combinedFov.RightTan = std::max(combinedFov.LeftTan, combinedFov.RightTan);    _cullingProjection = toGlm(ovrMatrix4f_Projection(combinedFov, DEFAULT_NEAR_CLIP, DEFAULT_FAR_CLIP, ovrProjection_ClipRangeOpenGL));     _renderTargetSize = uvec2(        eyeSizes[0].x + eyeSizes[1].x,        std::max(eyeSizes[0].y, eyeSizes[1].y));     memset(&_sceneLayer, 0, sizeof(ovrLayerEyeFov));    _sceneLayer.Header.Type = ovrLayerType_EyeFov;    _sceneLayer.Header.Flags = ovrLayerFlag_TextureOriginAtBottomLeft;    ovr_for_each_eye([&](ovrEyeType eye) {        ovrFovPort & fov = _sceneLayer.Fov[eye] = _eyeRenderDescs[eye].Fov;        ovrSizei & size = _sceneLayer.Viewport[eye].Size = ovr_GetFovTextureSize(_session, eye, fov, 1.0f);        _sceneLayer.Viewport[eye].Pos = { eye == ovrEye_Left ? 0 : size.w, 0 };    });     // This must come after the initialization, so that the values calculated     // above are available during the customizeContext call (when not running    // in threaded present mode)    return Parent::internalActivate();} void OculusBaseDisplayPlugin::internalDeactivate() {    Parent::internalDeactivate();    releaseOculusSession();    _session = nullptr;}