| 1 | /* |
| 2 | SDL - Simple DirectMedia Layer |
| 3 | Copyright (C) 1997-2009 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@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_ */ |