Class: Engine::Metal::Device

Inherits:
Object
  • Object
show all
Includes:
Fiddle
Defined in:
lib/engine/metal/device.rb

Instance Attribute Summary collapse

Class Method Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize ⇒ Device

Returns a new instance of Device.



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# File 'lib/engine/metal/device.rb', line 16

def initialize
  @device = MetalFramework.create_system_default_device
  raise "Failed to create Metal device" if @device.null?

  @command_queue = ObjC.msg(@device, 'newCommandQueue')
  raise "Failed to create command queue" if @command_queue.null?
end

Instance Attribute Details

#command_queue ⇒ Object (readonly)

Returns the value of attribute command_queue.



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# File 'lib/engine/metal/device.rb', line 10

def command_queue
  @command_queue
end

#device ⇒ Object (readonly)

Returns the value of attribute device.



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# File 'lib/engine/metal/device.rb', line 10

def device
  @device
end

Class Method Details

.instance ⇒ Object 



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# File 'lib/engine/metal/device.rb', line 12

def self.instance
  @instance ||= new
end

Instance Method Details

#new_command_buffer ⇒ Object 



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# File 'lib/engine/metal/device.rb', line 93

def new_command_buffer
  ObjC.msg(@command_queue, 'commandBuffer')
end

#new_compute_pipeline(library, function_name) ⇒ Object 



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# File 'lib/engine/metal/device.rb', line 59

def new_compute_pipeline(library, function_name)
  # Get function from library
  func_name_nsstring = ObjC.msg(
    ObjC.cls('NSString'),
    'stringWithUTF8String:',
    function_name
  )
  function = ObjC.msg(library, 'newFunctionWithName:', func_name_nsstring)
  raise "Failed to find function '#{function_name}'" if function.null?

  # Create compute pipeline
  error_ptr = Pointer.malloc(8)
  error_ptr[0, 8] = [0].pack('Q')

  pipeline = ObjC.msg(
    @device,
    'newComputePipelineStateWithFunction:error:',
    function,
    error_ptr
  )

  if pipeline.null?
    error = Pointer.new(error_ptr[0, 8].unpack('Q')[0])
    unless error.null?
      desc = ObjC.msg(error, 'localizedDescription')
      utf8 = ObjC.msg(desc, 'UTF8String')
      raise "Failed to create compute pipeline: #{utf8.to_s}"
    end
    raise "Failed to create compute pipeline with unknown error"
  end

  pipeline
end

#new_library_with_source(source) ⇒ Object 



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# File 'lib/engine/metal/device.rb', line 24

def new_library_with_source(source)
  # Create NSString from source
  ns_string_class = ObjC.cls('NSString')
  source_nsstring = ObjC.msg(
    ns_string_class,
    'stringWithUTF8String:',
    source
  )

  # Create error pointer
  error_ptr = Pointer.malloc(8)
  error_ptr[0, 8] = [0].pack('Q')

  # Compile the library
  library = ObjC.msg(
    @device,
    'newLibraryWithSource:options:error:',
    source_nsstring,
    nil,
    error_ptr
  )

  if library.null?
    error = Pointer.new(error_ptr[0, 8].unpack('Q')[0])
    unless error.null?
      desc = ObjC.msg(error, 'localizedDescription')
      utf8 = ObjC.msg(desc, 'UTF8String')
      raise "Metal shader compilation failed: #{utf8.to_s}"
    end
    raise "Metal shader compilation failed with unknown error"
  end

  library
end