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////////////////////////////////////////////////////////////
//
// SFML - Simple and Fast Multimedia Library
// Copyright (C) 2007-2008 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
{
////////////////////////////////////////////////////////////
/// PostFX is used to apply a post effect to a window
////////////////////////////////////////////////////////////
class SFML_API PostFX : public Drawable
{
public :
////////////////////////////////////////////////////////////
/// Default constructor
///
////////////////////////////////////////////////////////////
PostFX();
////////////////////////////////////////////////////////////
/// Copy constructor
///
/// \param Copy : Instance to copy
///
////////////////////////////////////////////////////////////
PostFX(const PostFX& Copy);
////////////////////////////////////////////////////////////
/// Destructor
///
////////////////////////////////////////////////////////////
~PostFX();
////////////////////////////////////////////////////////////
/// Load the effect from a file
///
/// \param Filename : Path of the effect file to load
///
/// \return True on success
///
////////////////////////////////////////////////////////////
bool LoadFromFile(const std::string& Filename);
////////////////////////////////////////////////////////////
/// Load the effect from a text in memory
///
/// \param Effect : String containing the effect code
///
/// \return True on success
///
////////////////////////////////////////////////////////////
bool LoadFromMemory(const std::string& Effect);
////////////////////////////////////////////////////////////
/// Change a parameter of the effect (1 float)
///
/// \param Name : Parameter name in the effect
/// \param X : Value to assign
///
////////////////////////////////////////////////////////////
void SetParameter(const std::string& Name, float X);
////////////////////////////////////////////////////////////
/// Change a parameter of the effect (2 floats)
///
/// \param Name : Parameter name in the effect
/// \param X, Y : Values to assign
///
////////////////////////////////////////////////////////////
void SetParameter(const std::string& Name, float X, float Y);
////////////////////////////////////////////////////////////
/// Change a parameter of the effect (3 floats)
///
/// \param Name : Parameter name in the effect
/// \param X, Y, Z : Values to assign
///
////////////////////////////////////////////////////////////
void SetParameter(const std::string& Name, float X, float Y, float Z);
////////////////////////////////////////////////////////////
/// Change a parameter of the effect (4 floats)
///
/// \param Name : Parameter name in the effect
/// \param X, Y, Z, W : Values to assign
///
////////////////////////////////////////////////////////////
void SetParameter(const std::string& Name, float X, float Y, float Z, float W);
////////////////////////////////////////////////////////////
/// Set a texture parameter
///
/// \param Name : Texture name in the effect
/// \param Texture : Image to set (pass NULL to use content of current framebuffer)
///
////////////////////////////////////////////////////////////
void SetTexture(const std::string& Name, Image* Texture);
////////////////////////////////////////////////////////////
/// Assignment operator
///
/// \param Other : Instance to assign
///
/// \return Reference to the post-effect
///
////////////////////////////////////////////////////////////
PostFX& operator =(const PostFX& Other);
////////////////////////////////////////////////////////////
/// Tell whether or not the system supports post-effects
///
/// \return True if the system can use post-effects
///
////////////////////////////////////////////////////////////
static bool CanUsePostFX();
protected :
////////////////////////////////////////////////////////////
/// /see Drawable::Render
///
////////////////////////////////////////////////////////////
virtual void Render(RenderTarget& Target) const;
private :
////////////////////////////////////////////////////////////
/// Preprocess a SFML effect file
/// to convert it to a valid GLSL fragment shader
///
/// \param File : Stream containing the code to process
///
/// \return Valid fragment shader source code
///
////////////////////////////////////////////////////////////
static std::string PreprocessEffect(std::istream& File);
////////////////////////////////////////////////////////////
/// Create the program and attach the shaders
///
////////////////////////////////////////////////////////////
void CreateProgram();
////////////////////////////////////////////////////////////
// Types
////////////////////////////////////////////////////////////
typedef std::map<std::string, const Image*> TextureTable;
////////////////////////////////////////////////////////////
// Member data
////////////////////////////////////////////////////////////
unsigned int myShaderProgram; ///< OpenGL identifier for the program
TextureTable myTextures; ///< Texture variables in the effect
std::string myFragmentShader; ///< Fragment shader source code
mutable Image myFrameBuffer; ///< Texture containing the current frame buffer
};
} // namespace sf
#endif // SFML_POSTFX_HPP
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