1 <HTML> 2 3 <TITLE>Environment Variables</TITLE> 4 5 <link rel="stylesheet" type="text/css" href="mesa.css"></head> 6 7 <BODY> 8 9 <H1>Environment Variables</H1> 10 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 <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. 31 <li>MESA_GLSL - <a href="shading.html#envvars">shading language options</a> 32 </ul> 33 34 <p> 35 The following are only applicable to the Xlib software driver. 36 See the <A HREF="xlibdriver.html">Xlib software driver page</A> for details. 37 </p> 38 <ul> 39 <li>MESA_RGB_VISUAL - specifies the X visual and depth for RGB mode 40 <li>MESA_CI_VISUAL - specifies the X visual and depth for CI mode 41 <li>MESA_BACK_BUFFER - specifies how to implement the back color buffer, 42 either "pixmap" or "ximage" 43 <li>MESA_GAMMA - gamma correction coefficients for red, green, blue channels 44 <li>MESA_XSYNC - enable synchronous X behavior (for debugging only) 45 <li>MESA_GLX_FORCE_CI - if set, force GLX to treat 8bpp visuals as CI visuals 46 <li>MESA_GLX_FX - set to either "fullscreen" for full-screen rendering, 47 "window" to render into a window, or "disable" to disable the Glide driver. 48 <li>MESA_GLX_FORCE_ALPHA - if set, forces RGB windows to have an alpha channel. 49 <li>MESA_GLX_DEPTH_BITS - specifies default number of bits for depth buffer. 50 <li>MESA_GLX_ALPHA_BITS - specifies default number of bits for alpha channel. 51 </ul> 52 53 54 <p> 55 These environment variables are for the Intel i945/i965 drivers: 56 </p> 57 <ul> 58 <li>INTEL_STRICT_CONFORMANCE - if set to 1, enable sw fallbacks to improve 59 OpenGL conformance. If set to 2, always use software rendering. 60 <li>INTEL_NO_BLIT - if set, disable hardware-accelerated glBitmap, 61 glCopyPixels, glDrawPixels. 62 </ul> 63 64 65 <p> 66 These environment variables are for the Radeon R300 driver: 67 </p> 68 <ul> 69 <li>R300_NO_TCL - if set, disable hardware-accelerated Transform/Clip/Lighting. 70 </ul> 71 72 <p> 73 Mesa EGL supports different sets of environment variables. See the 74 <a href="egl.html">Mesa EGL</a> page for the details. 75 </p> 76 77 </BODY> 78 </HTML> 79
