/*

    SDL - Simple DirectMedia Layer

    Copyright (C) 1997-2004 Sam Lantinga

    This library is free software; you can redistribute it and/or

    modify it under the terms of the GNU Library General Public

    License as published by the Free Software Foundation; either

    version 2 of the License, or (at your option) any later version.

    This library is distributed in the hope that it will be useful,

    but WITHOUT ANY WARRANTY; without even the implied warranty of

    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU

    Library General Public License for more details.

    You should have received a copy of the GNU Library General Public

    License along with this library; if not, write to the Free

    Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA

    Sam Lantinga

    slouken@libsdl.org

*/

#include "SDL_config.h"

/* Atari OSMesa.ldg implementation of SDL OpenGL support */

#ifndef _SDL_ATARIGL_H_

#define _SDL_ATARIGL_H_

#if SDL_VIDEO_OPENGL

#include <GL/osmesa.h>

#endif

#include "../SDL_sysvideo.h"

/* Hidden "this" pointer for the video functions */

#define _THIS   SDL_VideoDevice *this

struct SDL_PrivateGLData {

    int gl_active; 	/* to stop switching drivers while we have a valid context */

	int gl_oldmesa;	/* Old OpenGL support ? */

	int	gl_pixelsize;	/* for CopyShadow functions */

	SDL_bool gl_upsidedown; /* Some implementations draw upside down */

	Uint8 *gl_shadow;	/* Shadow buffer for old implementations */

	/* for unsupported OSMesa buffer formats */

	void (*ConvertSurface)(_THIS, SDL_Surface *surface);	

	/* to convert the shadow buffer to the screen format */

	void (*CopyShadow)(_THIS, SDL_Surface *surface);	

#if SDL_VIDEO_OPENGL

	OSMesaContext	ctx;

	/* OpenGL functions */

	void (*glGetIntegerv)( GLenum pname, GLint *value );

	void (*glFinish)(void);

	void (*glFlush)(void);

	/* osmesa.ldg */

	OSMesaContext (*OSMesaCreateContextExt)( GLenum format, GLint depthBits, GLint stencilBits, GLint accumBits, OSMesaContext sharelist);

	void (*OSMesaDestroyContext)( OSMesaContext ctx );

	GLboolean (*OSMesaMakeCurrent)( OSMesaContext ctx, void *buffer, GLenum type, GLsizei width, GLsizei height );

	void (*OSMesaPixelStore)( GLint pname, GLint value );

	void * (*OSMesaGetProcAddress)( const char *funcName );

	/* mesa_gl.ldg, tiny_gl.ldg */

	void *(*OSMesaCreateLDG)( long format, long type, long width, long height );

	void (*OSMesaDestroyLDG)(void);

	/* Info needed to compare existing context with new asked one */

	int width, height;

	GLenum format;

	GLint depth,stencil,accum;

#endif

};

/* Variable names */

#define gl_active		(this->gl_data->gl_active)

#define gl_ctx			(this->gl_data->ctx)

#define gl_oldmesa		(this->gl_data->gl_oldmesa)

#define gl_pixelsize	(this->gl_data->gl_pixelsize)

#define gl_upsidedown	(this->gl_data->gl_upsidedown)

#define gl_shadow		(this->gl_data->gl_shadow)

#define gl_convert		(this->gl_data->ConvertSurface)

#define gl_copyshadow	(this->gl_data->CopyShadow)

#define gl_curformat	(this->gl_data->format)

#define gl_curdepth		(this->gl_data->depth)

#define gl_curstencil	(this->gl_data->stencil)

#define gl_curaccum		(this->gl_data->accum)

#define gl_curwidth		(this->gl_data->width)

#define gl_curheight	(this->gl_data->height)

/* OpenGL functions */

extern int SDL_AtariGL_Init(_THIS, SDL_Surface *current);

extern void SDL_AtariGL_Quit(_THIS, SDL_bool unload);

extern void SDL_AtariGL_InitPointers(_THIS);

extern int SDL_AtariGL_LoadLibrary(_THIS, const char *path);

extern void *SDL_AtariGL_GetProcAddress(_THIS, const char *proc);

extern int SDL_AtariGL_GetAttribute(_THIS, SDL_GLattr attrib, int* value);

extern int SDL_AtariGL_MakeCurrent(_THIS);

extern void SDL_AtariGL_SwapBuffers(_THIS);

#endif /* _SDL_ATARIGL_H_ */