ES 3.x requires both TCS and TES to be present. We already checked the TCS && !TES case above, so we just have to check !TCS && TES here. Note that this is allowed in OpenGL, just not ES. This fixes a subcase of: dEQP-GLES31.functional.debug.negative_coverage.*.tessellation.single_tessellation_stage Signed-off-by: Kenneth Graunke <kenneth@whitecape.org> Reviewed-by: Alejandro Piñeiro <apinheiro@igalia.com>