D:/VL/BuildSystem/VL_DISTRO/Visualization_Library_SDK/src/vlGraphics/RenderTarget.hpp

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/*  Visualization Library                                                             */
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#ifndef RenderTarget_INCLUDE_ONCE
#define RenderTarget_INCLUDE_ONCE

#include <vlCore/vlnamespace.hpp>
#include <vlCore/Object.hpp>
#include <vlGraphics/OpenGL.hpp>
#include <vector>

namespace vl
{
  class OpenGLContext;
  //-----------------------------------------------------------------------------
  // RenderTarget
  //-----------------------------------------------------------------------------
  class VLGRAPHICS_EXPORT RenderTarget: public Object
  {
    friend class OpenGLContext;

  protected:
    virtual const char* className() { return "vl::RenderTarget"; }

    RenderTarget(OpenGLContext* ctx, int w, int h): mWidth(w), mHeight(h), mOpenGLContext(ctx)
    {
      VL_DEBUG_SET_OBJECT_NAME()
      setDrawBuffer(RDB_BACK_LEFT);
      setReadBuffer(RDB_BACK_LEFT);
    }

  public:
    OpenGLContext* openglContext() { return mOpenGLContext; }
    
    const OpenGLContext* openglContext() const { return mOpenGLContext; }

    int width() const { return mWidth; }
    
    int height() const { return mHeight; }
    
    void setWidth(int width) { mWidth = width; }
    
    void setHeight(int height) { mHeight = height; }

    virtual GLuint handle() const { return 0; }

    void activate(EFrameBufferBind target = FBB_FRAMEBUFFER)
    {
      bindFramebuffer(target);
    }

    virtual void bindFramebuffer(EFrameBufferBind target = FBB_FRAMEBUFFER)
    {
      VL_CHECK_OGL()

      // the base render target is the framebuffer 0, that is, the normal OpenGL buffers
      VL_glBindFramebuffer(target, 0); VL_CHECK_OGL()

      // bind draw buffers
      bindDrawBuffers();

      // bind read buffer
      bindReadBuffer();

      VL_CHECK_OGL()
    }

    void bindReadBuffer();

    void bindDrawBuffers() const;

    bool checkDrawBuffers() const;

    void setDrawBuffer(EReadDrawBuffer draw_buffer)
    {
      mDrawBuffers.clear();
      mDrawBuffers.push_back(draw_buffer);
    }

    void setDrawBuffers(EReadDrawBuffer draw_buffer1, EReadDrawBuffer draw_buffer2)
    {
      mDrawBuffers.clear();
      mDrawBuffers.push_back(draw_buffer1);
      mDrawBuffers.push_back(draw_buffer2);
    }

    void setDrawBuffers(EReadDrawBuffer draw_buffer1, EReadDrawBuffer draw_buffer2, EReadDrawBuffer draw_buffer3)
    {
      mDrawBuffers.clear();
      mDrawBuffers.push_back(draw_buffer1);
      mDrawBuffers.push_back(draw_buffer2);
      mDrawBuffers.push_back(draw_buffer3);
    }

    void setDrawBuffers(EReadDrawBuffer draw_buffer1, EReadDrawBuffer draw_buffer2, EReadDrawBuffer draw_buffer3, EReadDrawBuffer draw_buffer4)
    {
      mDrawBuffers.clear();
      mDrawBuffers.push_back(draw_buffer1);
      mDrawBuffers.push_back(draw_buffer2);
      mDrawBuffers.push_back(draw_buffer3);
      mDrawBuffers.push_back(draw_buffer4);
    }

    void setDrawBuffers(const std::vector< EReadDrawBuffer >& draw_buffers) { mDrawBuffers = draw_buffers; }

    const std::vector< EReadDrawBuffer >& drawBuffers() { return mDrawBuffers; }

    EReadDrawBuffer readBuffer() const { return mReadBuffer; }
    
    void setReadBuffer(EReadDrawBuffer read_buffer) { mReadBuffer = read_buffer; }

  private:
    std::vector< EReadDrawBuffer > mDrawBuffers;
    EReadDrawBuffer mReadBuffer;
    int mWidth;
    int mHeight;
    OpenGLContext* mOpenGLContext;
  };
  //------------------------------------------------------------------------------
}

#endif