Module: Engine::Metal::ObjC

Extended by:
Fiddle::Importer
Defined in:
lib/engine/metal/metal_bindings.rb

Constant Summary collapse

OBJC_LIB =

We need to handle objc_msgSend manually for variadic args

Fiddle.dlopen('/usr/lib/libobjc.A.dylib')
OBJC_MSGSEND_ADDR = 
OBJC_LIB['objc_msgSend']

Class Method Summary collapse

Class Method Details

.cls(name) ⇒ Object 



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# File 'lib/engine/metal/metal_bindings.rb', line 19

def self.cls(name)
  objc_getClass(name)
end

.msg(obj, selector, *args) ⇒ Object 



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# File 'lib/engine/metal/metal_bindings.rb', line 27

def self.msg(obj, selector, *args)
  sel_ptr = sel(selector)

  # Build argument types: obj, sel, then args
  arg_types = [Fiddle::TYPE_VOIDP, Fiddle::TYPE_VOIDP]
  call_args = [obj, sel_ptr]

  args.each do |arg|
    case arg
    when Integer
      arg_types << Fiddle::TYPE_LONG
      call_args << arg
    when Float
      arg_types << Fiddle::TYPE_DOUBLE
      call_args << arg
    when String
      arg_types << Fiddle::TYPE_VOIDP
      call_args << Fiddle::Pointer[arg]
    when Fiddle::Pointer
      arg_types << Fiddle::TYPE_VOIDP
      call_args << arg
    when nil
      arg_types << Fiddle::TYPE_VOIDP
      call_args << Fiddle::Pointer.new(0)
    else
      # Assume it's a pointer-like thing
      arg_types << Fiddle::TYPE_VOIDP
      call_args << arg
    end
  end

  func = Fiddle::Function.new(OBJC_MSGSEND_ADDR, arg_types, Fiddle::TYPE_VOIDP)
  result = func.call(*call_args)
  Fiddle::Pointer.new(result)
end

.sel(name) ⇒ Object 



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# File 'lib/engine/metal/metal_bindings.rb', line 23

def self.sel(name)
  sel_registerName(name)
end