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annotate src/video/ataricommon/SDL_atarigl_c.h @ 1005:2ab1cb02a44e

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Some Atari OpenGL implementations draw upside down
author Patrice Mandin <patmandin@gmail.com>
date Sat, 04 Dec 2004 20:53:58 +0000
parents d1cd674b2ecd
children 19418e4422cb
rev   line source
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1 /*
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2 SDL - Simple DirectMedia Layer
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3 Copyright (C) 1997-2004 Sam Lantinga
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4
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5 This library is free software; you can redistribute it and/or
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6 modify it under the terms of the GNU Library General Public
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7 License as published by the Free Software Foundation; either
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8 version 2 of the License, or (at your option) any later version.
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9
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10 This library is distributed in the hope that it will be useful,
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11 but WITHOUT ANY WARRANTY; without even the implied warranty of
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12 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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13 Library General Public License for more details.
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14
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15 You should have received a copy of the GNU Library General Public
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16 License along with this library; if not, write to the Free
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17 Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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18
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19 Sam Lantinga
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20 slouken@libsdl.org
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21 */
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22
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23 /* Atari OSMesa.ldg implementation of SDL OpenGL support */
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24
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25 #ifndef _SDL_ATARIGL_H_
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26 #define _SDL_ATARIGL_H_
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27
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28 #ifdef HAVE_OPENGL
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29 #include <GL/osmesa.h>
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30 #endif
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31
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32 #include "SDL_sysvideo.h"
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33 #define _THIS SDL_VideoDevice *this
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34
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35 struct SDL_PrivateGLData {
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36
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37 int gl_active; /* to stop switching drivers while we have a valid context */
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38
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39 int gl_oldmesa; /* Old OpenGL support ? */
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40
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41 int gl_pixelsize; /* for CopyShadow functions */
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42
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43 SDL_bool gl_upsidedown; /* Some implementations draw upside down */
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44
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45 Uint8 *gl_shadow; /* Shadow buffer for old implementations */
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46
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47 /* for unsupported OSMesa buffer formats */
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48 void (*ConvertSurface)(_THIS, SDL_Surface *surface);
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49
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50 /* to convert the shadow buffer to the screen format */
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51 void (*CopyShadow)(_THIS, SDL_Surface *surface);
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52
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53 #ifdef HAVE_OPENGL
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54 OSMesaContext ctx;
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55
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56 /* OpenGL functions */
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57 void (*glGetIntegerv)( GLenum pname, GLint *value );
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58 void (*glFinish)(void);
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59 void (*glFlush)(void);
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60
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61 /* osmesa.ldg */
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62 OSMesaContext (*OSMesaCreateContextExt)( GLenum format, GLint depthBits, GLint stencilBits, GLint accumBits, OSMesaContext sharelist);
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63 void (*OSMesaDestroyContext)( OSMesaContext ctx );
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64 GLboolean (*OSMesaMakeCurrent)( OSMesaContext ctx, void *buffer, GLenum type, GLsizei width, GLsizei height );
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65 void (*OSMesaPixelStore)( GLint pname, GLint value );
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66 void * (*OSMesaGetProcAddress)( const char *funcName );
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67
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68 /* mesa_gl.ldg, tiny_gl.ldg */
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69 void *(*OSMesaCreateLDG)( long format, long type, long width, long height );
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70 void (*OSMesaDestroyLDG)(void);
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71
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72 /* Info needed to compare existing context with new asked one */
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73 int width, height;
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74 GLenum format;
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75 GLint depth,stencil,accum;
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76 #endif
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77 };
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78
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79 /* Variable names */
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80 #define gl_active (this->gl_data->gl_active)
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81 #define gl_ctx (this->gl_data->ctx)
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82 #define gl_oldmesa (this->gl_data->gl_oldmesa)
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83 #define gl_pixelsize (this->gl_data->gl_pixelsize)
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84 #define gl_upsidedown (this->gl_data->gl_upsidedown)
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85 #define gl_shadow (this->gl_data->gl_shadow)
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86 #define gl_convert (this->gl_data->ConvertSurface)
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87 #define gl_copyshadow (this->gl_data->CopyShadow)
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88 #define gl_curformat (this->gl_data->format)
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89 #define gl_curdepth (this->gl_data->depth)
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90 #define gl_curstencil (this->gl_data->stencil)
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91 #define gl_curaccum (this->gl_data->accum)
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92 #define gl_curwidth (this->gl_data->width)
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93 #define gl_curheight (this->gl_data->height)
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94
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95 /* OpenGL functions */
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96 extern int SDL_AtariGL_Init(_THIS, SDL_Surface *current);
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97 extern void SDL_AtariGL_Quit(_THIS, SDL_bool unload);
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98 extern void SDL_AtariGL_InitPointers(_THIS);
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99
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100 extern int SDL_AtariGL_LoadLibrary(_THIS, const char *path);
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101 extern void *SDL_AtariGL_GetProcAddress(_THIS, const char *proc);
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102 extern int SDL_AtariGL_GetAttribute(_THIS, SDL_GLattr attrib, int* value);
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103 extern int SDL_AtariGL_MakeCurrent(_THIS);
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104 extern void SDL_AtariGL_SwapBuffers(_THIS);
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105
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106 #endif /* _SDL_ATARIGL_H_ */