bgfx_sys::BGFX_STATE_BLEND_FUNC_RT_xE!

macro_rules! BGFX_STATE_BLEND_FUNC_RT_xE {
    ($src:expr, $dst:expr, $equation:expr) => (
        BGFX_STATE_BLEND_FUNC_RT_x!($src, $dst) | ((($equation >> bgfx_sys::BGFX_STATE_BLEND_EQUATION_SHIFT) as u32) << 8)
    );
}