orted by D3D11
  BLENDOPERATION_MAXIMUM = 0x00000005 ## max(dst, src) : supported by D3D11">BlendOperation</a></li>
  <li><a class="reference" href="#BlendFactor"
    title="BlendFactor* {.size: sizeof(cint).} = enum
  BLENDFACTOR_ZERO = 0x00000001, ## 0, 0, 0, 0
  BLENDFACTOR_ONE = 0x00000002, ## 1, 1, 1, 1
  BLENDFACTOR_SRC_COLOR = 0x00000003, ## srcR, srcG, srcB, srcA
  BLENDFACTOR_ONE_MINUS_SRC_COLOR = 0x00000004, ## 1-srcR, 1-srcG, 1-srcB, 1-srcA
  BLENDFACTOR_SRC_ALPHA = 0x00000005, ## srcA, srcA, src