OS_SpriteOp and 32bpp sprites

[Tony van der Hoff]

On 17 Nov 2002, in message <4b96e1f336jdclark at argonet.co.uk>,
John Clark <jdclark at argonet.co.uk> wrote:

> When using OS_SpriteOP with reason codes 41 and 42 to read and write pixel
> colours in a 32 bpp sprite it seems that R5 contains the 24 bit RGB value
> and R6 (tint) is not used, though I can't find this clearly stated in the
> PRMs.
> 
> The OSLib calls for these reason codes, osspriteop_read_pixel_colour and
> osspriteop_write_pixel_colour take an os_gcol type for the colour value to
> go in R5.  However, this is a byte value and so will not take the 24 bit
> RGB value.
> 
> Have I missed something, or does OSLib need extending to cover 32 bpp (and
> 16 bpp?) sprite colour reads and writes?

It certainly looks as if you're correct. I guess it never got updated when
deep sprites were introduced. 

So, at the next update, I'll add osspriteop_read_pixel_colour_deep and
osspriteop_write_pixel_colour_deep taking an unsigned int type for R5 as
alternatives to these calls.

Thanks for the report.

-- 
Tony van der Hoff         | MailTo:tony at mk-net.demon.co.uk
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Buckinghamshire, England  | http:www.mk-net.demon.co.uk