DtOpenVRProvider.h

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/******************************************************************************
** Copyright (c) 2024 MAK Technologies, Inc.
** All rights reserved.
******************************************************************************/


#pragma once

#include "vrvVirtualReality/vrvVirtualReality.h"
#include "vrvVirtualReality/DtVirtualRealityProvider.h"

#include <vrvUtil/DtQuat.h>
#include <matrix/vlVector.h>

#include <osg/Matrixd>

#include <openvr.h>

#include <string>

namespace vr
{
   class IVRSystem;
   struct TrackedDevicePose_t;
}


namespace makVrv
{
   class DT_DLL_VRVVR DtOpenVRProvider : public DtVirtualRealityProvider
   {
   private:
      DtOpenVRProvider();

      DtOpenVRProvider(const DtOpenVRProvider&);

      DtOpenVRProvider& operator=(const DtOpenVRProvider&);

   public:
      static bool isVrAvailable();

   public:
      DtOpenVRProvider(DtDe& de);

      virtual ~DtOpenVRProvider();

      virtual DtSubmitOverlayCallback* createOverlayCallback(osg::Texture* tex, DtDe& de, DtVirtualRealityDriver& driver);

      virtual DtSubmitViewCallback* createViewCallback(DtVirtualRealityPostProcessor& pp, DtVirtualRealityDriver& driver, vrvVirtualReality::DtEye eye);

      virtual const std::string& providerName();

      virtual const std::string& deviceName();
      
      virtual bool initializeVR();

      virtual bool hasFocusViews();

      virtual bool useVrs();

      virtual DtVariableRateShadingImageUpdater* findVrsUpdater(DtVirtualRealityChannel* channel);

      virtual void getRecommendedRenderTargetSize(int& width, int& height, vrvVirtualReality::DtEye whichEye);

      virtual DtSwapChain* allocateSwapChain(vrvVirtualReality::DtEye whichEye, bool isOverlay);

      virtual void getProjectionAngles(vrvVirtualReality::DtEye eye, double& left, double& right, double& bottom, double& top, double znear, double zfar);

      virtual osg::Matrixd getEyeToHeadTransform(vrvVirtualReality::DtEye eye);

      virtual void commitEyeTexture(osg::RenderInfo& renderInfo, DtSwapChain* swapChain);

      virtual void commitHudTexture(osg::RenderInfo& renderInfo, DtSwapChain* swapChain);

      virtual void updateOverlayDimensions(float width, float height, float distance, int pixWidth, int pixHeight);

      virtual void tick();

      virtual void beginFrame();

      virtual void beginRendering();

      virtual void endRendering();

      virtual bool getHmdPose(DtVector& pos, DtQuat& ori);

      virtual void setHmdPoseOffset(const DtVector& pos, const DtQuat& ori);

      virtual bool getTrackedPose(DtVector& pos, DtQuat& ori, int index);

      virtual bool reset();

      virtual bool shutdown();

      virtual bool hasTrackedCamera();

      virtual DtTrackedCamera* findTrackedCamera();

      virtual DtMixedRealityMask* findMixedRealityMask();

      virtual vr::IVRSystem* findOpenVRSystem() const;

   protected:

      //OpenVR Structs
      vr::IVRSystem* myVrSystem;
      vr::TrackedDevicePose_t* myTrackedPoses;

      vr::Texture_t mySceneViewTexture;
      vr::Texture_t myOverlayViewTexture;

      uint64_t myOverlay;

      std::string myDeviceName;
   };
}