DtOsgEffectTextureController.h

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/******************************************************************************
** Copyright (c) 2020 MAK Technologies, Inc.
** All rights reserved.
******************************************************************************/


#pragma once

#include <vrvOsg/vrvOsg.h>

#include <vrvOsg/DtEffectTextureType.h>

#include <osgDB/Options>

#include <osg/Referenced>
#include <osg/ExtendedMaterial>
#include <osg/StateAttribute>

#include <string>

namespace osg
{
   class StateSet;
   class Texture;
}
namespace osgEarth
{
   class VirtualProgram;
}

namespace makVrv
{
   class DtOsgShaderManager;
   class DtOsgFileCache;
   class DtPossibleFileNamesCache;

   struct DtVirtualProgramParams;

   class DT_DLL_VRVOSG DtOsgEffectTextureController : public osg::Referenced
   {
   public:
      DtOsgEffectTextureController(DtDe& de, int type, const std::string& effectTypeCode);

   public: // Implementation methods

      virtual const std::string& effectTypeCode() const;

      virtual int effectTextureType() const;

      virtual osg::Texture* installEffectTexture(osg::Texture* baseTexture, int baseTexUnit,
         osg::StateSet* stateSet, const osgDB::Options* dbOptions, const DtPossibleFileNamesCache& possibleFilenames) const;

      virtual void findEffectTexture(const std::string& baseTextureName, const osgDB::Options* dbOptions, const DtPossibleFileNamesCache& possibleFilenames, const osg::Texture* baseTexture, osg::ref_ptr<osg::Texture>& effectTexture) const;

      virtual bool installShaders(int baseUnit, int effectUnit, const osg::Texture* tex, osg::StateSet* stateSet, const std::string& baseTextureName) const { return true; }

   protected:

      virtual ~DtOsgEffectTextureController();

      virtual osgEarth::VirtualProgram* installVirtualProgram(int baseUnit, int effectUnit, const osg::Texture* tex, osg::StateSet* stateSet, const std::string& baseTextureName
         , const DtVirtualProgramParams& params) const;

      // applies default shader LOD ranges, if applicable
      virtual void applyDefaultShaderLODRanges(osgEarth::VirtualProgram* vp, const std::string& function) const;

      const int myEffectTextureType;
      const std::string myEffectTypeCode;

      float       myDefaultMaxRange;

      const DtOsgFileCache& myFileCache;
      DtDe& myDe;
   };

   class DT_DLL_VRVOSG DtEffectTextureUnitStateAttribute : public osg::StateAttribute
   {
   public:

      static const osg::StateAttribute::Type EffectTextureUnitStateAttributeType = (osg::StateAttribute::Type)2000;

      DtEffectTextureUnitStateAttribute(unsigned int texCoordUnit = 0, const std::string& baseTextureName = "");

      ~DtEffectTextureUnitStateAttribute();

      DtEffectTextureUnitStateAttribute(const DtEffectTextureUnitStateAttribute& stateAttrib, const osg::CopyOp& copyop = osg::CopyOp::SHALLOW_COPY);

      META_StateAttribute(osg, DtEffectTextureUnitStateAttribute, EffectTextureUnitStateAttributeType);

      virtual bool isTextureAttribute() const;

      virtual int compare(const osg::StateAttribute& sa) const;

      unsigned int texCoordUnit() const;

      const std::string& baseTextureName() const;

   private:

      unsigned int myTexCoordUnit;
      
      std::string myBaseTextureName;
   };

}