3 <TITLE>Environment Variables
</TITLE>
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"stylesheet" type=
"text/css" href=
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9 <H1>Environment Variables
</H1>
12 Mesa supports the following environment variables:
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
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
24 fragment programs (intended for developers only)
25 <li>MESA_TNL_PROG - if set, implement conventional vertex transformation
26 operations with vertex programs (intended for developers only).
27 Setting this variable automatically sets the MESA_TEX_PROG variable as well.
28 <li>MESA_EXTENSION_OVERRIDE - can be used to enable/disable extensions.
29 A value such as
"GL_EXT_foo -GL_EXT_bar" will enable the GL_EXT_foo extension
30 and disable the GL_EXT_bar extension.
34 The following are only applicable to the Xlib software driver.
35 See the
<A HREF=
"xlibdriver.html">Xlib software driver page
</A> for details.
38 <li>MESA_RGB_VISUAL - specifies the X visual and depth for RGB mode
39 <li>MESA_CI_VISUAL - specifies the X visual and depth for CI mode
40 <li>MESA_BACK_BUFFER - specifies how to implement the back color buffer,
41 either
"pixmap" or
"ximage"
42 <li>MESA_GAMMA - gamma correction coefficients for red, green, blue channels
43 <li>MESA_XSYNC - enable synchronous X behavior (for debugging only)
44 <li>MESA_GLX_FORCE_CI - if set, force GLX to treat
8bpp visuals as CI visuals
45 <li>MESA_GLX_FX - set to either
"fullscreen" for full-screen rendering,
46 "window" to render into a window, or
"disable" to disable the Glide driver.
47 <li>MESA_GLX_FORCE_ALPHA - if set, forces RGB windows to have an alpha channel.
48 <li>MESA_GLX_DEPTH_BITS - specifies default number of bits for depth buffer.
49 <li>MESA_GLX_ALPHA_BITS - specifies default number of bits for alpha channel.