package scratch

import "core:mem"
import "core:mem/virtual"

@(thread_local)
scratch_init_done: bool
@(thread_local)
arenas: [2]virtual.Arena
@(thread_local)
allocators: [2]mem.Allocator

_init_scratch :: #force_inline proc() {
	if !scratch_init_done {
		for i in 0 ..< 2 {
			_ = virtual.arena_init_static(&arenas[i])
			allocators[i] = virtual.arena_allocator(&arenas[i])
		}
	}
}

get_scratch :: proc(conflict := context.temp_allocator) -> mem.Allocator {
	_init_scratch()

	if conflict.data == allocators[1].data {
		return allocators[0]
	} else {
		return allocators[1]
	}
}