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3<TITLE>Environment Variables</TITLE>
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9<H1>Environment Variables</H1>
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11<p>
12Mesa supports the following environment variables:
13</p>
14<ul>
15<li>MESA_NO_ASM - if set, disables all assembly language optimizations
16<li>MESA_NO_MMX - if set, disables Intel MMX optimizations
17<li>MESA_NO_3DNOW - if set, disables AMD 3DNow! optimizations
18<li>MESA_NO_SSE - if set, disables Intel SSE optimizations
19<li>MESA_DEBUG - if set, error messages are printed to stderr.
20If the value of MESA_DEBUG is "FP" floating point arithmetic errors will
21generate exceptions.
22<li>MESA_NO_DITHER - if set, disables dithering, overriding glEnable(GL_DITHER)
23<li>MESA_TEX_PROG - if set, implement conventional texture env modes with
24fragment programs (intended for developers only)
25<li>MESA_TNL_PROG - if set, implement conventional vertex transformation
26operations with vertex programs (intended for developers only).
27Setting this variable automatically sets the MESA_TEX_PROG variable as well.
28</ul>
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30<p>
31The following are only applicable to the Xlib software driver.
32See the <A HREF="xlibdriver.html">Xlib software driver page</A> for details.
33</p>
34<ul>
35<li>MESA_RGB_VISUAL - specifies the X visual and depth for RGB mode
36<li>MESA_CI_VISUAL - specifies the X visual and depth for CI mode
37<li>MESA_BACK_BUFFER - specifies how to implement the back color buffer,
38    either "pixmap" or "ximage"
39<li>MESA_GAMMA - gamma correction coefficients for red, green, blue channels
40<li>MESA_XSYNC - enable synchronous X behavior (for debugging only)
41<li>MESA_GLX_FORCE_CI - if set, force GLX to treat 8bpp visuals as CI visuals
42<li>MESA_GLX_FX - set to either "fullscreen" for full-screen rendering,
43  "window" to render into a window, or "disable" to disable the Glide driver.
44<li>MESA_GLX_FORCE_ALPHA - if set, forces RGB windows to have an alpha channel.
45<li>MESA_GLX_DEPTH_BITS - specifies default number of bits for depth buffer.
46<li>MESA_GLX_ALPHA_BITS - specifies default number of bits for alpha channel.
47</ul>
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