/*
  Copyright 2012-2020 David Robillard <d@drobilla.net>

  Permission to use, copy, modify, and/or distribute this software for any
  purpose with or without fee is hereby granted, provided that the above
  copyright notice and this permission notice appear in all copies.

  THIS SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
  WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
  MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
  ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
  WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
  ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
  OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
*/

#ifndef PUGL_GL_H
#define PUGL_GL_H

#include "pugl/pugl.h"

// IWYU pragma: begin_exports

/* Unfortunately, GL includes vary across platforms, so include them here to
   enable pure portable programs. */

#ifndef PUGL_NO_INCLUDE_GL_H
#  ifdef __APPLE__
#    include <OpenGL/gl.h>
#  else
#    ifdef _WIN32
#      include <windows.h>
#    endif
#    include <GL/gl.h>
#  endif
#endif

#ifndef PUGL_NO_INCLUDE_GLU_H
#  ifdef __APPLE__
#    include <OpenGL/glu.h>
#  else
#    ifdef _WIN32
#      include <windows.h>
#    endif
#    include <GL/glu.h>
#  endif
#endif

// IWYU pragma: end_exports

PUGL_BEGIN_DECLS

/**
   @defgroup gl OpenGL
   OpenGL graphics support.
   @ingroup pugl
   @{
*/

/**
   OpenGL extension function.
*/
typedef void (*PuglGlFunc)(void);

/**
   Return the address of an OpenGL extension function.
*/
PUGL_API
PuglGlFunc
puglGetProcAddress(const char* name);

/**
   Enter the OpenGL context.

   This can be used to enter the graphics context in unusual situations, for
   doing things like loading textures.  Note that this must not be used for
   drawing, which may only be done while processing an expose event.
*/
PUGL_API
PuglStatus
puglEnterContext(PuglView* view);

/**
   Leave the OpenGL context.

   This must only be called after puglEnterContext().
*/
PUGL_API
PuglStatus
puglLeaveContext(PuglView* view);

/**
   OpenGL graphics backend.

   Pass the returned value to puglSetBackend() to draw to a view with OpenGL.
*/
PUGL_API
PUGL_CONST_FUNC
const PuglBackend*
puglGlBackend(void);

PUGL_END_DECLS

/**
   @}
*/

#endif // PUGL_GL_H