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| <TITLE>Environment Variables</TITLE> |
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| <H1>Environment Variables</H1> |
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| <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. |
| <li>MESA_EXTENSION_OVERRIDE - can be used to enable/disable extensions. |
| A value such as "GL_EXT_foo -GL_EXT_bar" will enable the GL_EXT_foo extension |
| and disable the GL_EXT_bar extension. |
| <li>MESA_GLSL - <a href="shading.html#envvars">shading language options</a> |
| </ul> |
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| <p> |
| The following are only applicable to the Xlib software driver. |
| See the <A HREF="xlibdriver.html">Xlib software driver page</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> |
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| <p> |
| These environment variables are for the Intel i945/i965 drivers: |
| </p> |
| <ul> |
| <li>INTEL_STRICT_CONFORMANCE - if set to 1, enable sw fallbacks to improve |
| OpenGL conformance. If set to 2, always use software rendering. |
| <li>INTEL_NO_BLIT - if set, disable hardware-accelerated glBitmap, |
| glCopyPixels, glDrawPixels. |
| </ul> |
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| <p> |
| These environment variables are for the Radeon R300 driver: |
| </p> |
| <ul> |
| <li>R300_NO_TCL - if set, disable hardware-accelerated Transform/Clip/Lighting. |
| </ul> |
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| <p> |
| Mesa EGL supports different sets of environment variables. See the |
| <a href="egl.html">Mesa EGL</a> page for the details. |
| </p> |
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