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<TITLE>Environment Variables</TITLE>

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<H1>Environment Variables</H1>

<p>
Mesa supports the following environment variables:
</p>
<ul>
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<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
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<li>MESA_DEBUG - if set, error messages are printed to stderr.
If the value of MESA_DEBUG is "FP" floating point arithmetic errors will
generate exceptions.
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<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:
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<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)
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<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.
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<li>MESA_GLX_FORCE_ALPHA - if set, forces RGB windows to have an alpha channel.
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<li>MESA_GLX_DEPTH_BITS - specifies default number of bits for depth buffer.
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<li>MESA_GLX_ALPHA_BITS - specifies default number of bits for alpha channel.
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</ul>


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