DtVirtualRealityChannel.h

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/******************************************************************************
** Copyright (c) 2021 MAK Technologies, Inc.
** All rights reserved.
******************************************************************************/


#pragma once

#include "vrvVirtualReality/vrvVirtualReality.h"

#include <vrvOsg/DtOsgChannel.h>
#include <vrvOsg/DtVariableRateShadingImage.h>
#include <vrvOsg/DtVariableRateShadingImagePalette.h>
#include <osg/Texture2DArray>


namespace makVrv
{
   class DT_DLL_VRVVR DtVirtualRealityChannel : public DtOsgChannel
   {
   protected:
      friend class DtVirtualRealityChannelCreator;

      // \brief CTOR
      DtVirtualRealityChannel(DtDe& de, DtOsgWindow* window, DtChannelConfiguration& config);

   public:

      virtual ~DtVirtualRealityChannel();

      virtual bool initialize();

      virtual void setWidth(int width);

      virtual void setHeight(int height);

      virtual void setViewport(int x, int y, int width, int height);

      virtual void resetViewport();

      virtual void setRenderToTexture(bool enabled);

      virtual void setIsMultiView(bool enabled, bool useAA);

      virtual bool isMultiView() const;

      virtual void setIgnoreZoom(bool ignore);

      virtual bool isIgnoringZoom() const;

      virtual void setProjectionConfiguration(DtChannelConfiguration::ProjectionUnits units, float left, float right, float bottom, float top, float zNear, float zFar);

      virtual void setCameraOffsetConfiguration(const osg::Vec3d& trans, const osg::Quat& ori);

      virtual void getNearFar(double& zNear, double& zFar);

      //| \brief calculate a projection matrix for the passed frustum values (in vrv units)
      virtual osg::Matrix calculateEyeProjecionMatrix(DtChannelConfiguration::ProjectionUnits units, float left, float right, float bottom, float top, float zNear, float zFar);

      virtual void setFrustumAnglesForEye(osg::Vec4 frustumAngles, int multiViewEye);

      virtual void setProjectionMatrixForEye(osg::Matrix matrix, int multiViewEye);

      osg::Uniform* eyeProjectionMatrixUniform();

      osg::Uniform* eyeInverseProjectionMatrixUniform();

      virtual void updateProjectionConfigurationForMultiView();

      osg::Uniform* eyeOffsetMatrixUniform();

      void setOffsetForEye(osg::Vec3 offset, osg::Vec3 cameraSpaceOffset, int multiViewEye);

      // ! return the shading rate image used for this channel
      DtVariableRateShadingImage* shadingRateImage() const;

      // ! return the shading rate image palette used for this channel
      DtVariableRateShadingImagePalette* shadingRateImagePalette() const;

      boost::signalslib::signal<void()> signal_renderTextureChanged;

   protected:
      virtual void projectFor3D();

      virtual void projectFor2D();

      virtual void updateProjection();

      virtual void slot_windowConfigurationModified(const std::string&, const std::string&, const DtWindowConfiguration&);
      
      virtual void initializeSignalConnections();

      virtual void getRenderTextureAttachmentInfo(unsigned int& level, unsigned int& face, unsigned int& sampleBuffers, unsigned int& samples);

      virtual osg::ref_ptr<osg::Texture> allocateRenderTexture(int width, int height) const;

   private:
       DtVirtualRealityChannel();

       DtVirtualRealityChannel(const DtVirtualRealityChannel& other);

       DtVirtualRealityChannel& operator=(const DtVirtualRealityChannel& other);

   protected:
      int myWidth;
      int myHeight;

      bool myIsMultiView;

      bool myMultiViewUsesAA;

      bool myIgnoreZoom;
      
      osg::Vec4 myEyeFrustumAngles[2];

      osg::ref_ptr<osg::Uniform> myEyeProjectionMatrixUniform;

      osg::ref_ptr<osg::Uniform> myEyeInverseProjectionMatrixUniform;

      osg::ref_ptr<osg::Uniform> myEyeOffsetMatrixUniform;

      osg::ref_ptr<DtVariableRateShadingImage> myShadingRateImage;
      osg::ref_ptr<DtVariableRateShadingImagePalette> myShadingRateImagePalette;
   };

   class DT_DLL_VRVVR DtVirtualRealityChannelCreator : public DtChannelCreator
   {
   public:
      virtual DtChannel* create(DtDe& de, DtWindow* window, DtChannelConfiguration& config);
   };
}