docs/envvars.html

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   9 <H1>Environment Variables</H1>
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  11 <p>
  12 Mesa 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.
  20 If the value of MESA_DEBUG is "FP" floating point arithmetic errors will
  21 generate exceptions.
  22 <li>MESA_NO_DITHER - if set, disables dithering, overriding glEnable(GL_DITHER)
  23 </ul>
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  25 <p>
  26 The following are only applicable to the Xlib software driver.
  27 See <A HREF="README.X11">README.X11</A> for details.
  28 </p>
  29 <ul>
  30 <li>MESA_RGB_VISUAL - specifies the X visual and depth for RGB mode
  31 <li>MESA_CI_VISUAL - specifies the X visual and depth for CI mode
  32 <li>MESA_BACK_BUFFER - specifies how to implement the back color buffer,
  33     either "pixmap" or "ximage"
  34 <li>MESA_GAMMA - gamma correction coefficients for red, green, blue channels
  35 <li>MESA_XSYNC - enable synchronous X behavior (for debugging only)
  36 <li>MESA_GLX_FORCE_CI - if set, force GLX to treat 8bpp visuals as CI visuals
  37 <li>MESA_GLX_FX - set to either "fullscreen" for full-screen rendering,
  38   "window" to render into a window, or "disable" to disable the Glide driver.
  39 <li>MESA_GLX_FORCE_ALPHA - if set, forces RGB windows to have an alpha channel.
  40 <li>MESA_GLX_DEPTH_BITS - specifies default number of bits for depth buffer.
  41 <li>MESA_GLX_ALPHA_BITS - specifies default number of bits for alpha channel.
  42 </ul>
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