dri_util: don't fail when not supporting ARB_compatibility with GL3.1

Currently, any driver that does not support the ARB_compatibility
extension will fail on GL3.1 context creation if the application does
not request the forward-compatiblity flag.

Restore the original check which changes mesa_api to API_OPENGL_CORE,
only when:
 - GL3.1 is requested, without the forward-compatiblity flag.
 - driver does not support ARB_compatibility - as deduced by
max_gl_compat_version.

Fixes: a0c8b49284e ("mesa: enable OpenGL 3.1 with ARB_compatibility")

v2:
 - Improve commit log (Emil).
 - Provide a correct explanation on the features documentation (Ian).

Cc: Marek Olšák <[email protected]>
Cc: Ian Romanick <[email protected]>
Cc: Kenneth Graunke <[email protected]>
Cc: Eric Engestrom <[email protected]>
Cc: Emil Velikov <[email protected]>
Signed-off-by: Andres Gomez <[email protected]>
Reviewed-by: Emil Velikov <[email protected]>
Reviewed-by: Marek Olšák <[email protected]>

0 files changed, 0 insertions, 0 deletions