DtGLRenderToTexture.h

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/******************************************************************************
** Copyright (c) 2017 MAK Technologies, Inc.
** All rights reserved.
******************************************************************************/
#pragma once


#include "DtGraphicsUtilsPreReqs.h"
#include "DtDataFormat.h"

#include <vector>
#include <string>

namespace makVrv
{
   class DT_DLL_VRVGRAPHICSUTILS DtGLRenderTexture 
   {
   public:
      DtGLRenderTexture(int width, int height, GLenum internalFormat, bool hasDepth);
      virtual ~DtGLRenderTexture();

      void activateForDrawingInto(void);
      void deactivateForDrawingInto(void);

      void bindColorTexture(int unit);
      void unbindColorTexture(int unit);

      int getWidth(void) const;
      int getHeight(void) const;
   private:
      unsigned myColorTextureID;
      unsigned myDepthBufferTextureID;

      unsigned myFBOID;

      void initColorTexture();
      void initDepthBufferTexture();
      void initFBO();

      int myWidth;
      int myHeight;

      bool myHasDepth;

      bool myIsValid;
      GLenum myInternalFormat;
   };

   class DT_DLL_VRVGRAPHICSUTILS DtGLScreenQuad
   {
   public:
      DtGLScreenQuad();
      virtual ~DtGLScreenQuad();

      void draw();

   private:
      unsigned vbo;
      unsigned vao;
   };

   enum DtGLShaderType
   {
      DT_VERTEX_SHADER = 0
   ,  DT_HULL_SHADER
   ,  DT_DOMAIN_SHADER
   ,  DT_GEOMETRY_SHADER
   ,  DT_PIXEL_SHADER
   };

   class DT_DLL_VRVGRAPHICSUTILS DtGLShader
   {
   public:
      DtGLShader(const std::string& source, DtGLShaderType type);
      ~DtGLShader();
      bool isValid(void) const;
      unsigned id(void) const;
   private:
      unsigned myShaderID;
      bool myIsValid;
   };

   typedef std::vector<DtGLShader*> VectorShaders;

   class DT_DLL_VRVGRAPHICSUTILS DtGLProgram
   {
   public:
      DtGLProgram(const VectorShaders& shaders);
      ~DtGLProgram();
      void bind(void);
      void unbind(void);
      bool isValid(void) const;
      
   private:
      unsigned myProgramID;
      bool myIsValid;
      const VectorShaders myShaders;
   };
}