2 SDL - Simple DirectMedia Layer
3 Copyright (C) 1997-2009 Sam Lantinga
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.
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.
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
22 #include "SDL_config.h"
24 /* Atari OSMesa.ldg implementation of SDL OpenGL support */
26 #ifndef _SDL_ATARIGL_H_
27 #define _SDL_ATARIGL_H_
30 #include <GL/osmesa.h>
33 #include "../SDL_sysvideo.h"
35 /* Hidden "this" pointer for the video functions */
36 #define _THIS SDL_VideoDevice *this
38 struct SDL_PrivateGLData {
40 int gl_active; /* to stop switching drivers while we have a valid context */
42 int gl_oldmesa; /* Old OpenGL support ? */
44 int gl_pixelsize; /* for CopyShadow functions */
46 SDL_bool gl_upsidedown; /* Some implementations draw upside down */
48 Uint8 *gl_shadow; /* Shadow buffer for old implementations */
50 /* for unsupported OSMesa buffer formats */
51 void (*ConvertSurface)(_THIS, SDL_Surface *surface);
53 /* to convert the shadow buffer to the screen format */
54 void (*CopyShadow)(_THIS, SDL_Surface *surface);
59 /* OpenGL functions */
60 void (*glGetIntegerv)( GLenum pname, GLint *value );
61 void (*glFinish)(void);
62 void (*glFlush)(void);
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 );
71 /* mesa_gl.ldg, tiny_gl.ldg */
72 void *(*OSMesaCreateLDG)( long format, long type, long width, long height );
73 void (*OSMesaDestroyLDG)(void);
75 /* Info needed to compare existing context with new asked one */
78 GLint depth,stencil,accum;
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)
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);
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);
109 #endif /* _SDL_ATARIGL_H_ */