DH Shaders Incompatibility

trying to turn on shaders with DH gives the following error message: "error: java.lang.illegalstateexception: only indirect is supported with iris."
I have sodium 0.6.2, iris 1.8.1 and dh 2.2.1 installed on mc 1.21.1, the versions seem to adhere the guides but this error still occurs... help pls & thank you!