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<HTML>
<TITLE>Environment Variables</TITLE>
<BODY text="#000000" bgcolor="#55bbff" link="#111188">
<H1>Environment Variables</H1>
<p>
Mesa supports the following environment variables:
</p>
<ul>
<li>MESA_NO_ASM - if set, disables all assembly language optimizations
<li>MESA_NO_MMX - if set, disables Intel MMX optimizations
<li>MESA_NO_3DNOW - if set, disables AMD 3DNow! optimizations
<li>MESA_NO_SSE - if set, disables Intel SSE optimizations
<li>MESA_DEBUG - if set, error messages are printed to stderr
<li>MESA_NO_DITHER - if set, disables dithering, overriding glEnable(GL_DITHER)
</ul>
<p>
The following environment variables are only applicable to the Xlib/X11
software driver:
</p>
<ul>
<li>MESA_RGB_VISUAL - specifies the X visual and depth for RGB mode (X only)
<li>MESA_CI_VISUAL - specifies the X visual and depth for CI mode (X only)
<li>MESA_BACK_BUFFER - specifies how to implement the back color buffer (X only)
<li>MESA_GAMMA - gamma correction coefficients (X only)
<li>MESA_XSYNC - enable synchronous X behavior (for X debugging only)
<li>MESA_GLX_FORCE_CI - if set, force GLX to treak 8bpp visuals as CI visuals
<li>MESA_GLX_FX - set to either "fullscreen" for full-screen rendering,
"window" to render into a window, or "disable" to disable the Glide driver.
<li>MESA_GLX_FORCE_ALPHA - if set, forces RGB windows to have an alpha channel.
</ul>
</BODY>
</HTML>
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