[linuxdc-dev]framebuffer and alpha channel

[Gene M. <mcc...@en...>]

Is the alpha channel supposed to work in the framebuffer driver?

I am using the 2.4.5 kernel supplied in the 010605 release from
m17n.org.  I am developing some code that uses the alpha channel if the
framebuffer driver indicates that it is there.  In 32 bit mode, the
Dreamcast framebuffer driver indicates that there are 8 bits of alpha,
but any value in alpha shows up as completely opaque.

My code has a fallback case and will do the alpha blending in software
if the framebuffer indicates that the bit depth for the alpha channel is
zero.  This works fine in the 16 bit case, but is of course slow.

Does this behave differently in a more recent kernel?