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comparison README.MiNT @ 1007:335d9376a2cd

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Document new OpenGL feature
author Patrice Mandin <patmandin@gmail.com>
date Mon, 06 Dec 2004 15:01:00 +0000
parents 44fd54a0ae5f
children 0e7218843cfb
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1006:3d9a199d2a70 1007:335d9376a2cd
72 V. Environment variables: 72 V. Environment variables:
73 73
74 SDL_VIDEODRIVER: 74 SDL_VIDEODRIVER:
75 Set to 'xbios' to force xbios video driver 75 Set to 'xbios' to force xbios video driver
76 Set to 'gem' to force gem video driver 76 Set to 'gem' to force gem video driver
77
78 SDL_VIDEO_GL_DRIVER:
79 Set to filename to load as OpenGL library, if you use SDL_GL_LoadLibrary()
77 80
78 SDL_AUDIODRIVER: 81 SDL_AUDIODRIVER:
79 Set to 'mint_gsxb' to force Atari GSXB audio driver 82 Set to 'mint_gsxb' to force Atari GSXB audio driver
80 Set to 'mint_mcsn' to force Atari MCSN audio driver 83 Set to 'mint_mcsn' to force Atari MCSN audio driver
81 Set to 'mint_stfa' to force Atari STFA audio driver 84 Set to 'mint_stfa' to force Atari STFA audio driver
124 affected to 1 button joysticks on the same port. 127 affected to 1 button joysticks on the same port.
125 128
126 ============================================================================== 129 ==============================================================================
127 VI. More informations about drivers: 130 VI. More informations about drivers:
128 131
132 OpenGL:
133 The default is to use the Mesa offscreen driver (osmesa.ldg). If you want
134 to use an older OpenGL implementation, like mesa_gl.ldg or tiny_gl.ldg,
135 your program must use SDL_GL_LoadLibrary() to do so, and retrieve the
136 needed function pointers with SDL_LoadFunction(). In all cases, the OpenGL
137 context is taken care of by SDL itself, you just have to use gl* functions.
138
139 However, there is one OpenGL call that has a different prototype in the old
140 implementations: glOrtho(). In the old implementations, it has 6 float as
141 parameters, in the standard one, it has 6 double parameters. If you want
142 to compile testdyngl, or any other SDL program that loads its OpenGL
143 library, you must change the glOrtho() prototype used in this program. In
144 osmesa.ldg, you can retrieve a glOrtho() with double parameters, by searching
145 for the function "glOrtho6d".
146
129 Xbios video: 147 Xbios video:
130 Video chip is detected using the _VDO cookie. 148 Video chip is detected using the _VDO cookie.
131 Screen enhancers are not supported, but could be if you know how to 149 Screen enhancers are not supported, but could be if you know how to
132 use them. 150 use them.
133 151