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Document new OpenGL feature

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extra : convert_revision : svn%3Ac70aab31-4412-0410-b14c-859654838e24/trunk%401008
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Patrice Mandin 2004-12-06 15:01:00 +00:00
parent 577126292d
commit 3abf09fa34
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18
README.MiNT
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@ -75,6 +75,9 @@ SDL_VIDEODRIVER:
Set to 'xbios' to force xbios video driver Set to 'xbios' to force xbios video driver
Set to 'gem' to force gem video driver Set to 'gem' to force gem video driver
SDL_VIDEO_GL_DRIVER:
Set to filename to load as OpenGL library, if you use SDL_GL_LoadLibrary()
SDL_AUDIODRIVER: SDL_AUDIODRIVER:
Set to 'mint_gsxb' to force Atari GSXB audio driver Set to 'mint_gsxb' to force Atari GSXB audio driver
Set to 'mint_mcsn' to force Atari MCSN audio driver Set to 'mint_mcsn' to force Atari MCSN audio driver
@ -126,6 +129,21 @@ SDL_JOYSTICK_ATARI:
============================================================================== ==============================================================================
VI. More informations about drivers: VI. More informations about drivers:
OpenGL:
The default is to use the Mesa offscreen driver (osmesa.ldg). If you want
to use an older OpenGL implementation, like mesa_gl.ldg or tiny_gl.ldg,
your program must use SDL_GL_LoadLibrary() to do so, and retrieve the
needed function pointers with SDL_LoadFunction(). In all cases, the OpenGL
context is taken care of by SDL itself, you just have to use gl* functions.
However, there is one OpenGL call that has a different prototype in the old
implementations: glOrtho(). In the old implementations, it has 6 float as
parameters, in the standard one, it has 6 double parameters. If you want
to compile testdyngl, or any other SDL program that loads its OpenGL
library, you must change the glOrtho() prototype used in this program. In
osmesa.ldg, you can retrieve a glOrtho() with double parameters, by searching
for the function "glOrtho6d".
Xbios video: Xbios video:
Video chip is detected using the _VDO cookie. Video chip is detected using the _VDO cookie.
Screen enhancers are not supported, but could be if you know how to Screen enhancers are not supported, but could be if you know how to