DtGlRenderToTexture.h

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/******************************************************************************
** Copyright (c) 2018 MAK Technologies, Inc.
** All rights reserved.
******************************************************************************/
#pragma once



#include <vrvGraphicsUtils/vrvGraphicsUtils.h>
#include <vrvGraphicsUtils/DtGlShader.h>
#include <vrvGraphicsUtils/DtDataFormat.h>

#include <vector>
#include <string>

namespace makVrv
{
   class DT_DLL_VRVGRAPHICSUTILS DtGlRenderTexture 
   {
   private:
      DtGlRenderTexture();

      DtGlRenderTexture(const DtGlRenderTexture&);

      DtGlRenderTexture& operator=(const DtGlRenderTexture&);

   public:
      enum ImageType {
         RGB8,
         RGBA8,
         RG16F,
         RGB16F,
         RGB32F,
         RGBA16F,
         RGBA32F,

         //depth types
         D16,
         D24,
         D32,
      };

      DtGlRenderTexture(const std::string& name, int width, int height, int samples = 0);

      virtual ~DtGlRenderTexture();

      bool init(ImageType colorFormat = RGB32F, GLenum minFilter = GL_LINEAR, GLenum wrapMode = GL_CLAMP_TO_EDGE);

      bool initDepth(ImageType depthFormat = D32);

      void activateForDrawingInto();

      void deactivateForDrawingInto();

      void bindColorTexture(int unit);

      void unbindColorTexture(int unit);

      int width() const;

      int height() const;

      unsigned int colorId() const;

      unsigned int depthId() const;

      int numSamples() const;

   protected:
      unsigned int myFboId;
      unsigned int myMultisampleFboId;
      unsigned int myMultisampleColorBuffer;
      unsigned int myMultisampleDepthBuffer;
      unsigned int myColorId;
      unsigned int myDepthId;

      void initColorTexture(const std::string& name, GLenum minfilter, GLenum wrapMode);
      void initDepthBufferTexture(const std::string& name);
      void initFBO(const std::string& name);

      GLenum getGLInternalTypes(ImageType colorType);

      int myWidth;
      int myHeight;

      bool myHasDepth;
      bool myIsValid;

      GLenum myColorFormat;
      GLenum myDepthFormat;
      std::string myName;

      int myNumSamples;
   };


   class DT_DLL_VRVGRAPHICSUTILS DtGlScreenQuad
   {
   private:
      DtGlScreenQuad(const DtGlScreenQuad&);

      DtGlScreenQuad& operator=(const DtGlScreenQuad&);

   public:
      DtGlScreenQuad();

      virtual ~DtGlScreenQuad();

      void draw();

   protected:
      unsigned int vbo;
   };
}