gls_state_manager.h

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/*! \file
  \brief The disti::GlsStateManager factory class. Creates an instance of a
state manager that manages the GL Studio runtime library's use of
the OpenGL context, minimizing unnecessary state changes.

  \par Copyright Information

 Copyright (c) 2017 by The DiSTI Corporation.<br>
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*/

#ifndef DISTI_GLS_STATE_MANAGER_H_INCLUDED
#define DISTI_GLS_STATE_MANAGER_H_INCLUDED

#include "gls_state_manager_interface.h"

#ifdef GLES20
#    include "gls_state_manager_es20_interface.h"
#endif

#ifdef GLS_GL_DEBUGGING
#    define ERROR_CHECK() DistiAssert( GL_NO_ERROR == GlsStateManager::CheckError() );
#else
#    define ERROR_CHECK()
#endif // GLS_GL_DEBUGGING

namespace disti
{
/** The GlsStateManager singleton class that holds an instance of a
  * state manager that manages the GL Studio runtime library's use of
  * the OpenGL context, minimizing unnecessary state changes.
  */
class GlsStateManager
{
public:
    /** The singleton accessor method for an implementation of an IGlsStateManager, which manages
      * the GL Studio runtime library's use of the OpenGL context, minimizing unnecessary state changes
      * \return Returns a pointer to the IGlsStateManager implementation singleton.
      *         For OpenGL ES 2.0, returns an implementation of an IGlsStateManagerES20
      */
    GLS_EXPORT static IGlsStateManager* Instance( void );

    /** returns the value of glGetError(), and prints the value if not equal to GL_NO_ERROR 
      */
    GLS_EXPORT static GLenum CheckError();

private:
    /** ctor */
    GlsStateManager( void );

    /** dtor */
    ~GlsStateManager();

    // Creates the proper instance for management by GlsGlobals
    static IGlsStateManager* CreateStateManager();
    friend class GlsGlobals;
};

} // namespace disti

#endif // DISTI_GLS_STATE_MANAGER_H_INCLUDED