Question

Okay bit shifting is still a bit weird to me.

I’ve got a 16bit value. The first 15 bits are colors and the last bit is alpha.

I have done this with 24 and 32 bit colors no problem as they are nice byte size’s to deal with, but I cant seem to get this to work with 15/16 bits.

This is what I’ve done in the past, with 24/32 bit colors

(m_colorValue >> RED_CHANNEL) & 0xFF;

I’m trying to split the value into 4 values. 3 5 bit color values and 1 alpha value.
I don’t know what mask I should be using.

Thanks.

Answer 1

If I understand correctly:

red = (packed >> 0) & 0x1F;
green = (packed >> 5) & 0x1F;
blue = (packed >> 10) & 0x1F;
alpha = (packed >> 15) & 0x01;

packed should better be an unsigned and I’m probably off for the order.