[PD-dev] [GEM] CVS-changes

[chris clepper]

>chris clepper wrote:
>>someone brought up the issue of using float vs int arguments to the 
>>pix_ objects, but i can't find the mail right now.
>that was me. i think it was in a personal email to you.
>
>>be used.  the exact RGB or YUV integer value in certain objects is 
>>much more precise than using a float
>true
>
>>  and it saves conversions.
>well, i guess one conversion per processing a whole picture (or 
>better: one conversion when setting a value) is not that bad.

right, but my point is more about precision and ease of use.  i'm 
about to commit [pix_chroma_key] which has R G B (or Y U V) for the 
key value as an int, which makes more sense to use than a float.  to 
my mind it's easier to work with R=100 G=10 B=135 rather than figure 
out the percentage 135 is of 255.  of course you can add a few [/ 
255] before the object but that seems like a wasteful method.  also, 
i'm working on some objects that move pixels around in various ways 
and it's just insane to use a float 0..1 to describe a 4:3 image. 
you'll go mad trying to keep the numbers straight (in fact, GL is now 
moving away from float texture mapping to int).

>>
>>an object like [pix_offset] should use integer arguments rather 
>>than floats for example.
>int is surely the "right" way. but i though it more convenient to 
>use floats (0..1) which "maps" automagically to ints when using 
>negative numbers (-1 .. -255). But of course, that's not correct in 
>mathematical terms....

i do think that floats make sense for most objects and in GEM as a 
whole since both audio and GL use floats.  but there are certain 
cases where ints work better than floats.

>and then we have all these compatibility issues with old patches...

good point, so maybe there really is no need to change existing 
objects.  in fact, [pix_offset] might work just as well using floats 
since it does make sense to subtract 6% from blue or add 15% to red, 
etc.  so just new objects need to have the option of using ints as 
arguments?  it really makes using some of the objects i'm working on 
a whole lot easier..

cgc

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>IOhannes