- compose-custom-blend-mode src-color-factor dst-color-factor color-operation src-alpha-factor dst-alpha-factor alpha-operationprocedure
See SDL_ComposeCustomBlendMode.
- src-color-factor, dst-color-factor, src-alpha-factor, dst-alpha-factor must be blend factor symbols or equivalent integers.
- color-operation and alpha-operation must be blend operation symbols or equivalent integers.
Requires SDL 2.0.6 or higher, and sdl2 egg 0.4.0 or higher.