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      1 /*
      2     SDL - Simple DirectMedia Layer
      3     Copyright (C) 1997-2012 Sam Lantinga
      4 
      5     This library is free software; you can redistribute it and/or
      6     modify it under the terms of the GNU Library General Public
      7     License as published by the Free Software Foundation; either
      8     version 2 of the License, or (at your option) any later version.
      9 
     10     This library is distributed in the hope that it will be useful,
     11     but WITHOUT ANY WARRANTY; without even the implied warranty of
     12     MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
     13     Library General Public License for more details.
     14 
     15     You should have received a copy of the GNU Library General Public
     16     License along with this library; if not, write to the Free
     17     Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
     18 
     19     Sam Lantinga
     20     slouken (at) libsdl.org
     21 */
     22 #include "SDL_config.h"
     23 
     24 /* Atari OSMesa.ldg implementation of SDL OpenGL support */
     25 
     26 #ifndef _SDL_ATARIGL_H_
     27 #define _SDL_ATARIGL_H_
     28 
     29 #if SDL_VIDEO_OPENGL
     30 #include <GL/osmesa.h>
     31 #endif
     32 
     33 #include "../SDL_sysvideo.h"
     34 
     35 /* Hidden "this" pointer for the video functions */
     36 #define _THIS   SDL_VideoDevice *this
     37 
     38 struct SDL_PrivateGLData {
     39 
     40     int gl_active; 	/* to stop switching drivers while we have a valid context */
     41 
     42 	int gl_oldmesa;	/* Old OpenGL support ? */
     43 
     44 	int	gl_pixelsize;	/* for CopyShadow functions */
     45 
     46 	SDL_bool gl_upsidedown; /* Some implementations draw upside down */
     47 
     48 	Uint8 *gl_shadow;	/* Shadow buffer for old implementations */
     49 
     50 	/* for unsupported OSMesa buffer formats */
     51 	void (*ConvertSurface)(_THIS, SDL_Surface *surface);
     52 
     53 	/* to convert the shadow buffer to the screen format */
     54 	void (*CopyShadow)(_THIS, SDL_Surface *surface);
     55 
     56 #if SDL_VIDEO_OPENGL
     57 	OSMesaContext	ctx;
     58 
     59 	/* OpenGL functions */
     60 	void (*glGetIntegerv)( GLenum pname, GLint *value );
     61 	void (*glFinish)(void);
     62 	void (*glFlush)(void);
     63 
     64 	/* osmesa.ldg */
     65 	OSMesaContext (*OSMesaCreateContextExt)( GLenum format, GLint depthBits, GLint stencilBits, GLint accumBits, OSMesaContext sharelist);
     66 	void (*OSMesaDestroyContext)( OSMesaContext ctx );
     67 	GLboolean (*OSMesaMakeCurrent)( OSMesaContext ctx, void *buffer, GLenum type, GLsizei width, GLsizei height );
     68 	void (*OSMesaPixelStore)( GLint pname, GLint value );
     69 	void * (*OSMesaGetProcAddress)( const char *funcName );
     70 
     71 	/* mesa_gl.ldg, tiny_gl.ldg */
     72 	void *(*OSMesaCreateLDG)( long format, long type, long width, long height );
     73 	void (*OSMesaDestroyLDG)(void);
     74 
     75 	/* Info needed to compare existing context with new asked one */
     76 	int width, height;
     77 	GLenum format;
     78 	GLint depth,stencil,accum;
     79 #endif
     80 };
     81 
     82 /* Variable names */
     83 #define gl_active		(this->gl_data->gl_active)
     84 #define gl_ctx			(this->gl_data->ctx)
     85 #define gl_oldmesa		(this->gl_data->gl_oldmesa)
     86 #define gl_pixelsize	(this->gl_data->gl_pixelsize)
     87 #define gl_upsidedown	(this->gl_data->gl_upsidedown)
     88 #define gl_shadow		(this->gl_data->gl_shadow)
     89 #define gl_convert		(this->gl_data->ConvertSurface)
     90 #define gl_copyshadow	(this->gl_data->CopyShadow)
     91 #define gl_curformat	(this->gl_data->format)
     92 #define gl_curdepth		(this->gl_data->depth)
     93 #define gl_curstencil	(this->gl_data->stencil)
     94 #define gl_curaccum		(this->gl_data->accum)
     95 #define gl_curwidth		(this->gl_data->width)
     96 #define gl_curheight	(this->gl_data->height)
     97 
     98 /* OpenGL functions */
     99 extern int SDL_AtariGL_Init(_THIS, SDL_Surface *current);
    100 extern void SDL_AtariGL_Quit(_THIS, SDL_bool unload);
    101 extern void SDL_AtariGL_InitPointers(_THIS);
    102 
    103 extern int SDL_AtariGL_LoadLibrary(_THIS, const char *path);
    104 extern void *SDL_AtariGL_GetProcAddress(_THIS, const char *proc);
    105 extern int SDL_AtariGL_GetAttribute(_THIS, SDL_GLattr attrib, int* value);
    106 extern int SDL_AtariGL_MakeCurrent(_THIS);
    107 extern void SDL_AtariGL_SwapBuffers(_THIS);
    108 
    109 #endif /* _SDL_ATARIGL_H_ */
    110