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require 'ffi/freenect'
require 'freenect/device'
module Freenect
class ContextError < StandardError
end
class Context
def initialize(usb_ctx=nil)
ctx_p = FFI::MemoryPointer.new(:pointer)
if ::FFI::Freenect.freenect_init(ctx_p, usb_ctx) != 0
raise ContextError, "freenect_init() returned nonzero"
elsif ctx_p.null?
raise ContextError, "freenect_init() produced a NULL context"
end
@ctx = ctx_p.read_pointer
end
def context
if @ctx_closed
raise ContextError, "This context has been shut down and can no longer be used"
else
return @ctx
end
end
def num_devices
::FFI::Freenect.freenect_num_devices(self.context)
end
def open_device(idx)
return Device.new(self, idx)
end
alias [] open_device
def set_log_level(loglevel)
::FFI::Freenect.freenect_set_log_level(self.context, loglevel)
end
alias log_level= set_log_level
def set_log_callback(&block)
::FFI::Freenect.freenect_set_log_callback(self.context, block)
end
def process_events
::FFI::Freenect.freenect_process_events(self.context)
end
def close
unless closed?
if ::FFI::Freenect.freenect_shutdown(@ctx) != 0
raise ContextError, "freenect_shutdown() returned nonzero"
end
@ctx_closed = true
end
end
alias shutdown close
def closed?
@ctx_closed == true
end
end
end
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