Environment Variables

Mesa supports the following environment variables:

• MESA_NO_ASM - if set, disables all assembly language optimizations
• MESA_NO_MMX - if set, disables Intel MMX optimizations
• MESA_NO_3DNOW - if set, disables AMD 3DNow! optimizations
• MESA_NO_SSE - if set, disables Intel SSE optimizations
• 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.
• MESA_NO_DITHER - if set, disables dithering, overriding glEnable(GL_DITHER)
• MESA_TEX_PROG - if set, implement conventional texture env modes with fragment programs (intended for developers only)
• 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.

The following are only applicable to the Xlib software driver. See the Xlib software driver page for details.

• MESA_RGB_VISUAL - specifies the X visual and depth for RGB mode
• MESA_CI_VISUAL - specifies the X visual and depth for CI mode
• MESA_BACK_BUFFER - specifies how to implement the back color buffer, either "pixmap" or "ximage"
• MESA_GAMMA - gamma correction coefficients for red, green, blue channels
• MESA_XSYNC - enable synchronous X behavior (for debugging only)
• MESA_GLX_FORCE_CI - if set, force GLX to treat 8bpp visuals as CI visuals
• MESA_GLX_FX - set to either "fullscreen" for full-screen rendering, "window" to render into a window, or "disable" to disable the Glide driver.
• MESA_GLX_FORCE_ALPHA - if set, forces RGB windows to have an alpha channel.
• MESA_GLX_DEPTH_BITS - specifies default number of bits for depth buffer.
• MESA_GLX_ALPHA_BITS - specifies default number of bits for alpha channel.