bind_push_constants()

template<typename T , typename Receiver >

Influence< T >::Target MayaFlux::Nexus::bind_push_constants	(	const Receiver &	target,
		size_t	offset = 0
	)

Target that pushes an influence's value to a GPU executor as push constants.

Template Parameters

T	Trivially copyable struct matching the shader's push constant layout.

Parameters

target

An operator with push_constants (MeshFieldOperator, InstanceFieldOperator) or a shader processor with set_push_constant_data; raw pointer or shared_ptr, retained by the target.

For an operator this arms the next dispatch of its executor. This is how an Agent's state reaches a slot-transform kernel, for example one assembled from a DualField of mat4 through ShaderSpec::Assemble::function(). For a shader processor the push block is grown to hold T at offset here, so a shader that already declares it is not drawn before the block exists. A shader that keeps push constants of its own passes the byte offset after them and declares both in one block.

Definition at line 154 of file FieldTargets.hpp.

{
    if constexpr (requires { target->get_push_constant_data(); }) {
        if (target->get_push_constant_data().size() < offset + sizeof(T)) {
            target->set_push_constant_size(offset + sizeof(T));
        }
    }
 
    return [target, offset](const T& data) {
        if constexpr (requires { target->push_constants(data); }) {
            target->push_constants(data);
        } else {
            if (target->get_push_constant_data().size() < offset + sizeof(T)) {
                target->set_push_constant_size(offset + sizeof(T));
            }
            std::memcpy(target->get_push_constant_data().data() + offset, &data, sizeof(T));
        }
    };
}

References offset.