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9<H1>Environment Variables</H1>
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11<p>
12Mesa supports the following environment variables:
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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
20<li>MESA_NO_DITHER - if set, disables dithering, overriding glEnable(GL_DITHER)
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24The following environment variables are only applicable to the Xlib/X11
25software driver:
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28<li>MESA_RGB_VISUAL - specifies the X visual and depth for RGB mode (X only)
29<li>MESA_CI_VISUAL - specifies the X visual and depth for CI mode (X only)
30<li>MESA_BACK_BUFFER - specifies how to implement the back color buffer (X only)
31<li>MESA_GAMMA - gamma correction coefficients (X only)
32<li>MESA_XSYNC - enable synchronous X behavior (for X debugging only)
33<li>MESA_GLX_FORCE_CI - if set, force GLX to treak 8bpp visuals as CI visuals
34<li>MESA_GLX_FX - set to either "fullscreen" for full-screen rendering,
35  "window" to render into a window, or "disable" to disable the Glide driver.
36<li>MESA_GLX_FORCE_ALPHA - if set, forces RGB windows to have an alpha channel.
37<li>MESA_GLX_DEPTH_BITS - specifies default number of bits for depth buffer.
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