mesa: Allow override of GL version with environment variable
It is necessary to manually set the GL version to 3.0 in order to run
Piglit tests that use glGetUniform*().
This patch allows one to override the version of the OpenGL context by
setting the environment variable MESA_GL_VERSION_OVERRIDE.
Reviewed-by: Brian Paul <brianp@vmware.com>
Reviewed-by: Kenneth Graunke <kenneth@whitecape.org>
Reviewed-by: Ian Romanick <ian.d.romanick@intel.com>
Signed-off-by: Chad Versace <chad@chad-versace.us>
diff --git a/docs/envvars.html b/docs/envvars.html
index 986d2f8..6402ec5 100644
--- a/docs/envvars.html
+++ b/docs/envvars.html
@@ -58,6 +58,10 @@
If the extension string is too long, the buffer overrun can cause the game
to crash.
This is a work-around for that.
+<li>MESA_GL_VERSION_OVERRIDE - changes the value returned by
+glGetString(GL_VERSION). Valid values are point-separated version numbers,
+such as "3.0". Mesa will not really implement all the features of the given
+version if it's higher than what's normally reported.
<li>MESA_GLSL - <a href="shading.html#envvars">shading language compiler options</a>
</ul>