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/*
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 */
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);
#ifdef HAVE_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_ */
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