Compose swizzles using util_format_compose_swizzles instead
of the custom code (which somehow had a bug).
This makes the GL_ALPHA internal format work.
Signed-off-by: Wladimir J. van der Laan <laanwj@gmail.com>
Reviewed-by: Ilia Mirkin <imirkin@alum.mit.edu>
Reviewed-by: Rob Clark <robdclark@gmail.com>
Wladimir J. van der Laan
fb41372761