KSG-Framework/Texture.h

#pragma once

#include "Critical.h"
#include "Point.h"
#include "ReferenceCounter.h"

namespace Framework
{
    class Image;       //! Image.h
    class TextureList; //! TextureList.h

    enum TextureDirection
    {
        RAM_TO_GPU = 0, //! The texture is copied from an Image to GPU and then
                        //! used in shaders
        GPU_TO_RAM = 1, //! The texture is created by a shader and then copied
                        //! to an Image
    };

    //! Converts an image to a texture that can be passed to the graphics
    //! card for rendering
    class Texture : public virtual ReferenceCounter
    {
    protected:
        Image* bild;
        bool changed;
        Point lastGr;
        int id;
        TextureDirection direction;

    public:
        //! Constructor
        DLLEXPORT Texture(TextureDirection dir);
        //! Destructor
        DLLEXPORT virtual ~Texture();
        //! Sets a pointer to the image that contains the texture
        //! \param b The pointer to the image
        DLLEXPORT void setImageZ(Image* b);
        //! Sets the image that contains the texture by copying it
        //! \param b The image to copy
        DLLEXPORT void setImage(Image* b);
        //! Updates the texture. The pixels of the current image are copied
        //! to graphics memory
        DLLEXPORT virtual bool updateTextur() = 0;
        //! Returns true if updateTextur needs to be called
        DLLEXPORT virtual bool needsUpdate() const = 0;
        //! Returns a pointer to the image
        DLLEXPORT Image* getImage() const;
        //! Returns a pointer to the image without increased reference counter
        DLLEXPORT Image* zImage() const;
        //! Returns the id of the texture if it was registered in a TextureList.
        //! (see Framework::zTextureRegister())
        DLLEXPORT int getId() const;
        //! Returns the direction of the texture
        DLLEXPORT TextureDirection getDirection() const;

        friend TextureList;
    };
} // namespace Framework