meta: Add flag MESA_META_SELECT_FEEDBACK
If this flag is set, then _mesa_meta_begin/end will save/restore the state of GL_SELECT and GL_FEEDBACK render modes. Intel's future buffer resolve meta-ops will require this, since buffer resolves may occur when the GL_RENDER_MODE is GL_SELECT. Reviewed-by:Brian Paul <brianp@vmware.com> Signed-off-by:
Chad Versace <chad@chad-versace.us>
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