/*

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

*/

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

#ifndef _SDL_ATARIGL_H_

#define _SDL_ATARIGL_H_

#ifdef HAVE_OPENGL

#include <GL/osmesa.h>

#endif

#include "SDL_sysvideo.h"

#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 */

/* 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);

/* OpenGL functions */

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

void (*glFinish)(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;

};

#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_upsidedown (this->gl_data->gl_upsidedown)

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

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

#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 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_ */