RubyGL::IndexArray

# File lib/rubygl/memory.rb, line 79
def initialize(index_array)
    buff_ptr = FFI::MemoryPointer.new(:pointer)
    Native.glGenBuffers(1, buff_ptr)
    
    @buffer_id = buff_ptr.get_int(0)
    @buffer_elements = index_array.size
    @buffer_valid = true
    
    if @buffer_id <= 0 then
        raise "Could Not Allocate A GPU Buffer For The IndexArray Object"
    end
    
    Native.glBindBuffer(Native::GL_ELEMENT_ARRAY_BUFFER, @buffer_id)
    
    index_data = FFI::MemoryPointer.new(:uint, index_array.size)
    index_data.write_array_of_uint(index_array)
    
    Native.glBufferData(Native::GL_ELEMENT_ARRAY_BUFFER, index_data.size, index_data, Native::GL_STATIC_DRAW)
    
    Native.glBindBuffer(Native::GL_ELEMENT_ARRAY_BUFFER, 0)
end

# File lib/rubygl/memory.rb, line 101
def draw(components)
    raise "Call To IndexArray#draw On Frozen Object" unless @buffer_valid

    Native.glBindBuffer(Native::GL_ELEMENT_ARRAY_BUFFER, @buffer_id)

    Native.glDrawElements(Native::GL_TRIANGLES, @buffer_elements, Native::GL_UNSIGNED_INT, FFI::MemoryPointer::NULL)

    Native.glBindBuffer(Native::GL_ELEMENT_ARRAY_BUFFER, 0)
end

# File lib/rubygl/memory.rb, line 114
def release()
    raise "Call To IndexArray#release On Invalid Object" unless @buffer_valid

    buff_ptr = FFI::MemoryPointer.new(:uint)
    buff_ptr.write_uint(@buffer_id)
    
    Native.glDeleteBuffers(1, buff_ptr)
    
    @buffer_valid = false
end