Class: SGC::Memory::Buffer

Inherits:

Object

• Object
• SGC::Memory::Buffer

show all

Includes:

IBuffer

Defined in:

lib/memory/buffer.rb

Overview

Class Method Summary (collapse)

• + (Integer) element_size(type)

  The size of an element of type.

Instance Method Summary (collapse)

• - (Object) [](index)

  The element at index of this buffer.

• - (Object) []=(index, value)

  Set the element at index of this buffer to value.

• - (Integer) element_size

  The size of an element in this buffer in bytes.

• - (Object) initialize(type, size) constructor

  A buffer with size elements of type.

• - (MemoryPointer) offset(index)

  A memory pointer pointing to the index element.

• - (Integer) size

  The number of elements in this buffer.

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# File 'lib/memory/buffer.rb', line 45

def initialize(type, size)
    @@reads[type] && @@writes[type] or raise "Invalid buffer element type."

    @reader = @@reads[type]
    @writer = @@writes[type]
    @ptr = FFI::MemoryPointer.new(type, size)
    @size = size
end

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# File 'lib/memory/buffer.rb', line 108

def self.element_size(type)
    @@sizes[type]
end

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# File 'lib/memory/buffer.rb', line 57

def [](index)
    assert_index(index)
    @ptr[index].send(@reader)
end

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# File 'lib/memory/buffer.rb', line 67

def []=(index, value)
    assert_index(index)
    @ptr[index].send(@writer, value)
    value
end

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# File 'lib/memory/buffer.rb', line 81

def element_size
    @ptr.type_size
end

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# File 'lib/memory/buffer.rb', line 100

def offset(index)
    assert_index(index)
    MemoryPointer.new(@ptr[index])
end

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# File 'lib/memory/buffer.rb', line 75

def size
    @size
end