mesa: Add EXT_instanced_arrays support
The support for ARB_instanced_arrays already exists for big GL, reuse the same
PIPE_CAP_VERTEX_ELEMENT_INSTANCE_DIVISOR for this extension.
The OES_draw_elements_base_vertex and EXT_draw_elements_base_vertex both define
the DrawElementsInstancedBaseVertex method when EXT_instanced_arrays is defined.
Signed-off-by: Corentin Noël <corentin.noel@collabora.com>
Reviewed-by: Marek Olšák <marek.olsak@amd.com>
Acked-by: Erik Faye-Lund <erik.faye-lund@collabora.com>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/22167>