<HTML> <TITLE>Environment Variables</TITLE> <link rel="stylesheet" type="text/css" href="mesa.css"></head> <BODY> <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. If the value of MESA_DEBUG is "FP" floating point arithmetic errors will generate exceptions. <li>MESA_NO_DITHER - if set, disables dithering, overriding glEnable(GL_DITHER) <li>MESA_TEX_PROG - if set, implement conventional texture env modes with fragment programs (intended for developers only) <li>MESA_TNL_PROG - if set, implement conventional vertex transformation operations with vertex programs (intended for developers only). Setting this variable automatically sets the MESA_TEX_PROG variable as well. </ul> <p> The following are only applicable to the Xlib software driver. See <A HREF="README.X11">README.X11</A> for details. </p> <ul> <li>MESA_RGB_VISUAL - specifies the X visual and depth for RGB mode <li>MESA_CI_VISUAL - specifies the X visual and depth for CI mode <li>MESA_BACK_BUFFER - specifies how to implement the back color buffer, either "pixmap" or "ximage" <li>MESA_GAMMA - gamma correction coefficients for red, green, blue channels <li>MESA_XSYNC - enable synchronous X behavior (for debugging only) <li>MESA_GLX_FORCE_CI - if set, force GLX to treat 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. <li>MESA_GLX_DEPTH_BITS - specifies default number of bits for depth buffer. <li>MESA_GLX_ALPHA_BITS - specifies default number of bits for alpha channel. </ul> </BODY> </HTML>