Re: Alpha channel in RayShade

[Jose' C. <cru...@ce...>]

Il giorno 05/lug/07, alle ore 20:57, Roger Holmes ha scritto:

> I need to change RayShade to support the alpha channel.
>
> Currently each pixel is encoded as four floats, r,g,b and alpha. This
> is then converted to three bytes when the alpha is thrown away. This
> is then converted back to the representation desired by the
> application and O.S. . I can do it three different ways, by making
> the internal buffer always four bytes, or always four floats, or by
> looking at the output representation and using either three or four
> bytes as appropriate. For simplicity, I favour the four byte
> approach, though at the cost of a larger buffer, but then RAM is now
> fairly cheap.
>
> Your thoughts please.
>
> Roger.


I vote to maintain four floats till is converted to the native format

the code to write the pixels to the destination bitmap is ugly to say =20=

the least, specially on windows, so I think it has to be reworked.

On the other hand, while experimenting with spherical lights, I've =20
noted problems with the antialiasing, but I've not gone much further =20
since,

if we have to redo the antialiasing code (cubic and gaussian) =20
probably is better to have the data as four floats, the size is not a =20=

problem, anyway we need just a tiny strip of data that will be copied =20=

to the destination buffer



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