source/openvr/openvrsystem.cpp

   1 #include <openvr.h>
   2 #include <msp/vr/stereoview.h>
   3 #include "openvrsystem.h"
   4
   5 using namespace std;
   6
   7 namespace {
   8
   9 Msp::GL::Matrix convert_matrix(const vr::HmdMatrix34_t &m)
  10 {
  11         Msp::GL::Matrix result;
  12         for(unsigned i=0; i<3; ++i)
  13                 for(unsigned j=0; j<4; ++j)
  14                         result(i, j) = m.m[i][j];
  15         return result;
  16 }
  17
  18 }
  19
  20
  21 namespace Msp {
  22 namespace VR {
  23
  24 unsigned OpenVRSystem::n_instances = 0;
  25
  26 OpenVRSystem::OpenVRSystem()
  27 {
  28         if(!n_instances)
  29         {
  30                 vr::EVRInitError init_err;
  31                 vr::VR_Init(&init_err, vr::VRApplication_Scene);
  32                 if(init_err!=vr::VRInitError_None)
  33                         throw runtime_error("OpenVR initialization failed");
  34         }
  35         ++n_instances;
  36
  37         vr::IVRCompositor *compositor = vr::VRCompositor();
  38         if(!compositor)
  39                 throw runtime_error("OpenVR compositor initialization failed");
  40
  41         vr::VRCompositor()->SetTrackingSpace(vr::TrackingUniverseSeated);
  42 }
  43
  44 OpenVRSystem::~OpenVRSystem()
  45 {
  46         if(!--n_instances)
  47                 vr::VR_Shutdown();
  48 }
  49
  50 bool OpenVRSystem::is_maybe_available()
  51 {
  52         return vr::VR_IsHmdPresent();
  53 }
  54
  55 void OpenVRSystem::configure_view(StereoView &view) const
  56 {
  57         vr::IVRSystem *vr_sys = vr::VRSystem();
  58
  59 #if defined(__GNUC__) && defined(_WIN32)
  60         /* Visual C++ passes the return value address as first stack parameter and
  61         the this pointer in ecx.  MinGW does the other way around.  This trick
  62         forces the function signature to match at machine code level. */
  63         typedef void (vr::IVRSystem::*FuncPtr)(vr::HmdMatrix34_t *, vr::EVREye);
  64         FuncPtr get_eye_to_head_transform = reinterpret_cast<FuncPtr>(&vr::IVRSystem::GetEyeToHeadTransform);
  65
  66         vr::HmdMatrix34_t left, right;
  67         (vr_sys->*get_eye_to_head_transform)(&left, vr::Eye_Left);
  68         (vr_sys->*get_eye_to_head_transform)(&right, vr::Eye_Right);
  69 #else
  70         vr::HmdMatrix34_t left = vr_sys->GetEyeToHeadTransform(vr::Eye_Left);
  71         vr::HmdMatrix34_t right = vr_sys->GetEyeToHeadTransform(vr::Eye_Right);
  72 #endif
  73
  74         view.set_eye_matrices(convert_matrix(left), convert_matrix(right));
  75 }
  76
  77 void OpenVRSystem::set_absolute_tracking(bool a)
  78 {
  79         vr::VRCompositor()->SetTrackingSpace(a ? vr::TrackingUniverseStanding : vr::TrackingUniverseSeated);
  80 }
  81
  82 OpenVRCamera *OpenVRSystem::create_camera(const GL::Camera &bc)
  83 {
  84         return new OpenVRCamera(*this, bc);
  85 }
  86
  87 OpenVRCombiner *OpenVRSystem::create_combiner(GL::View &v)
  88 {
  89         return new OpenVRCombiner(*this, v);
  90 }
  91
  92 void OpenVRSystem::update_pose_matrices()
  93 {
  94         vector<vr::TrackedDevicePose_t> poses;
  95         poses.resize(vr::k_unTrackedDeviceIndex_Hmd+1);
  96         vr::VRCompositor()->WaitGetPoses(&poses[0], poses.size(), 0, 0);
  97
  98         vr::TrackedDevicePose_t &hmd_pose = poses[vr::k_unTrackedDeviceIndex_Hmd];
  99         if(hmd_pose.bPoseIsValid)
 100                 hmd_matrix = convert_matrix(hmd_pose.mDeviceToAbsoluteTracking);
 101 }
 102
 103 } // namespace VR
 104 } // namespace Msp