[PATCH 3/4] wined3d: Add a slop for color keying.

[Henri Verbeet]

On 20 August 2015 at 12:28, Stefan Dösinger <stefandoesinger at gmail.com> wrote:
> Am 2015-08-20 um 11:06 schrieb Henri Verbeet:
>> Shouldn't you just pass the color key as a range to the shader
>> instead? E.g. in a 6 bpc format anything between 0.484f and 0.500f
>> would get quantized to 0x1f. (Which, other floating point issues
>> aside, would correspond to about 0.008 slop here. For a 5 bpc
>> format you'd even have 0.016.)
> That would mean two uniforms instead of one, but could help with range
> color keys. I'll investigate the idea.
>
You could of course also derive the slop from the format's channel
sizes, but it would need to be a vector because of formats like
WINED3DFMT_B5G6R5_UNORM, still need an extra uniform, and not make
range color keys any easier.