GraphicsContext.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_GRAPHICSCONTEXT_HPP
#define SFML_GRAPHICSCONTEXT_HPP

// Headers
#include <SFML/Config.hpp>
#include <SFML/System/NonCopyable.hpp>
#include <GL/glew.h>
#include <iostream>
#include <string>
 
 
namespace sf
{
class Context;
 
namespace priv
{
class GraphicsContext : NonCopyable
{
public :

    GraphicsContext();

    ~GraphicsContext();
 
private :

    // Member data
    bool myActivated; 
};
 
} // namespace priv
 

#ifdef SFML_DEBUG
 
    // In debug mode, perform a test on every OpenGL call
    #define GLCheck(Func) ((Func), GLCheckError(__FILE__, __LINE__))
 
#else
 
    // Else, we don't add any overhead
    #define GLCheck(Func) (Func)
 
#endif
 

inline void GLCheckError(const std::string& File, unsigned int Line)
{
    // Get the last error
    GLenum ErrorCode = glGetError();
 
    if (ErrorCode != GL_NO_ERROR)
    {
        std::string Error = "unknown error";
        std::string Desc  = "no description";
 
        // Decode the error code
        switch (ErrorCode)
        {
            case GL_INVALID_ENUM :
            {
                Error = "GL_INVALID_ENUM";
                Desc  = "an unacceptable value has been specified for an enumerated argument";
                break;
            }
 
            case GL_INVALID_VALUE :
            {
                Error = "GL_INVALID_VALUE";
                Desc  = "a numeric argument is out of range";
                break;
            }
 
            case GL_INVALID_OPERATION :
            {
                Error = "GL_INVALID_OPERATION";
                Desc  = "the specified operation is not allowed in the current state";
                break;
            }
 
            case GL_STACK_OVERFLOW :
            {
                Error = "GL_STACK_OVERFLOW";
                Desc  = "this command would cause a stack overflow";
                break;
            }
 
            case GL_STACK_UNDERFLOW :
            {
                Error = "GL_STACK_UNDERFLOW";
                Desc  = "this command would cause a stack underflow";
                break;
            }
 
            case GL_OUT_OF_MEMORY :
            {
                Error = "GL_OUT_OF_MEMORY";
                Desc  = "there is not enough memory left to execute the command";
                break;
            }
 
            case GL_INVALID_FRAMEBUFFER_OPERATION_EXT :
            {
                Error = "GL_INVALID_FRAMEBUFFER_OPERATION_EXT";
                Desc  = "the object bound to FRAMEBUFFER_BINDING_EXT is not \"framebuffer complete\"";
                break;
            }
        }
 
        // Log the error
        std::cerr << "An internal OpenGL call failed in "
                  << File.substr(File.find_last_of("\\/") + 1) << " (" << Line << ") : "
                  << Error << ", " << Desc
                  << std::endl;
    }
}
 
} // namespace sf
 
 
#endif // SFML_GRAPHICSCONTEXT_HPP