#version 450
#extension GL_EXT_buffer_reference : require
#extension GL_ARB_gpu_shader_int64 : require

layout(buffer_reference) buffer Node;
layout(buffer_reference) buffer Node
{
	int value;
	layout(offset = 16) Node next;
	layout(offset = 32) Node prev;
};

layout(std430, set = 0, binding = 0) buffer LinkedList
{
	restrict Node head1;
	restrict Node head2;
};

void copy_node(restrict Node dst, restrict Node a, restrict Node b)
{
	dst.value = a.value + b.value;
}

void overwrite_node(out Node dst, Node src)
{
	dst = src;
}

void main()
{
	restrict Node n = gl_WorkGroupID.x < 4u ? head1 : head2;
	copy_node(n.next, head1, head2);
	overwrite_node(n, head1);
	int v = head2.value;
	n.value = 20;
	n.value = v * 10;

	uint64_t uptr = uint64_t(head2.next);
	Node unode = Node(uptr);
}