PostFX.hpp

//
// SFML - Simple and Fast Multimedia Library
// Copyright (C) 2007-2009 Laurent Gomila (laurent.gom@gmail.com)
//
// This software is provided 'as-is', without any express or implied warranty.
// In no event will the authors be held liable for any damages arising from the use of this software.
//
// Permission is granted to anyone to use this software for any purpose,
// including commercial applications, and to alter it and redistribute it freely,
// subject to the following restrictions:
//
// 1. The origin of this software must not be misrepresented;
//    you must not claim that you wrote the original software.
//    If you use this software in a product, an acknowledgment
//    in the product documentation would be appreciated but is not required.
//
// 2. Altered source versions must be plainly marked as such,
//    and must not be misrepresented as being the original software.
//
// 3. This notice may not be removed or altered from any source distribution.
//
 
#ifndef SFML_POSTFX_HPP
#define SFML_POSTFX_HPP

// Headers
#include <SFML/Graphics/Drawable.hpp>
#include <SFML/Graphics/Image.hpp>
#include <istream>
#include <map>
#include <string>
 
 
namespace sf
{
class SFML_API PostFX : public Drawable
{
public :

    PostFX();

    PostFX(const PostFX& Copy);

    ~PostFX();

    bool LoadFromFile(const std::string& Filename);

    bool LoadFromMemory(const std::string& Effect);

    void SetParameter(const std::string& Name, float X);

    void SetParameter(const std::string& Name, float X, float Y);

    void SetParameter(const std::string& Name, float X, float Y, float Z);

    void SetParameter(const std::string& Name, float X, float Y, float Z, float W);

    void SetTexture(const std::string& Name, Image* Texture);

    PostFX& operator =(const PostFX& Other);

    static bool CanUsePostFX();
 
protected :

    virtual void Render(RenderTarget& Target) const;
 
private :

    static std::string PreprocessEffect(std::istream& File);

    void CreateProgram();

    // Types
    typedef std::map<std::string, const Image*> TextureTable;

    // Member data
    unsigned int  myShaderProgram;  
    TextureTable  myTextures;       
    std::string   myFragmentShader; 
    mutable Image myFrameBuffer;    
};
 
} // namespace sf
 
 
#endif // SFML_POSTFX_HPP