1 /* 2 SDL - Simple DirectMedia Layer 3 Copyright (C) 1997-2004 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
