The expectation is that drivers will set this based on OES_geometry_shader and ARB_viewport_array support. This is a separate enable on the same reasoning as for OES_texture_cube_map_array.
5644a90 mesa: add GL_OES_viewport_array to the extension string
src/compiler/glsl/glsl_parser_extras.cpp | 1 +
src/mesa/main/extensions_table.h | 1 +
src/mesa/main/mtypes.h | 1 +
3 files changed, 3 insertions(+)
Upstream: cgit.freedesktop.org