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20-Apr 14:32 UTC
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Mailing List Archive: 49091 messages
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Another "External library" problem..

 [1/4] from: cyphre:seznam:cz at: 3-Jul-2003 18:43


Hi List, I have another problem (but I'm not sure if this is solvable): I have a C function which returns pointer to rendering area containing RGB data. I need to MAKE image! which will be referencing to this data directly so when I use this image! in FACE and call SHOW FACE then Rebol should show me the current image without any additional data manipulation(like Ladislav's Get-mem? function does). This is the only way how to achieve realtime rendering... Has anyone Idea how to MAKE such kind of image! in Rebol? thanks in advance, Cyphre

 [2/4] from: rotenca:telvia:it at: 4-Jul-2003 10:02


> I have a C function which returns pointer to rendering area containing RGB > data. I need to MAKE image! which will be referencing to this data directly
<<quoted lines omitted: 3>>
> realtime rendering... > Has anyone Idea how to MAKE such kind of image! in Rebol?
This should work: http://www.escribe.com/internet/rebol/m32043.html or i don't understand well your problem. --- Ciao Romano

 [3/4] from: cyphre::seznam::cz at: 4-Jul-2003 11:17


Hi Romano, Your method is not suitable for this purpose: 1) allocation of block of struct! containing for example 512x512 * 4 bytes of chars! takes more than 30MB of memory!! 2)doing for example: img: make image! reduce [512x512 third z/data] 30 and more times per second gives you poor performance I meant any method which avoid ani image! data manipulation(like reduce in this case) from Rebol side. You only make image! referencing to the pointer you got from the external C function...then you need only do a SHOW to refresh face which contains this image with data which are frequently changed by extenral rendering library(in this case OpenGL) I think this is not possible but anyway, any idas are welcome. regards, Cyphre

 [4/4] from: rotenca:telvia:it at: 4-Jul-2003 12:53


Hi Cyphre,
> I think this is not possible but anyway
If you cannot build the image in REBOL and then pass the pointer to the external routine, i agree: there is no solution. From this point of view image! seems an immutable value and the construction of an image! datatype always make a copy of the binary string. Whe should need a new refinement: img: make image! ... img/data: binary-string --- Ciao Romano
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