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Code Snippets / [DBP] Pure DBP + Alpha

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Aaron Miller
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Posted: 2nd Sep 2007 06:16
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Hello all. I made a simple alpha function (rgba) which will make an alpha based color.


And here's an example using that:


Cheers,

-naota

DBP, $80. DBP's plugins, $320. Watching DBP Crash, Priceless.
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TEH_CODERER
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Posted: 2nd Sep 2007 15:03
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Thats awesome! Cloggy's dll can obviously do that but its nice to see how it works. I must admit I am somewhat stumped as to how that line actually works. I've never seen anything like it.

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Aaron Miller
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Posted: 2nd Sep 2007 22:04
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It's simply a few bitwise operators. Colors are stored like this in DBP and DirectX:

0xAARRGGBB

For example, 0xFFFF0000 is pure red. This: 0xFF00FF00 is pure green, and 0xFF0000FF is pure blue. Now, the alpha value is stored at the left, the very first FF part. Changing that part would give an alpha value, 0x77FF0000. That's now an alpha of red. With the rgba function I provided, you wouldn't have to memorize this, or you could just change a specific value, for testing.


Cheers,

-naota

DBP, $80. DBP's plugins, $320. Watching DBP Crash, Priceless.
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TEH_CODERER
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Posted: 3rd Sep 2007 01:33
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OK. I sort of understood I was just thrown out by the use of '<<', 'and' + 'or' in an equals equation. Thanks!

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Mr Tank
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Posted: 3rd Sep 2007 01:51
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This is very cool.
Presuming that the values specified for a,r,g,b are 0-255, presumably the "and" statements aren't necessary? I should check this out myself.
Also, is "and" the same as "&&" ?

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Aaron Miller
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Posted: 3rd Sep 2007 06:49
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Mr Tank:
and is the same as && from what I understand, but I decided to make it the AND command because it would look more basic, and easy to understand. I believe the AND statements are indeed necessary, but I could be wrong..

TEH_CODERER:
Well, those all allow for placing within the bits of the output DWORD value. Bitwise operators you know.


Cheers,

-naota

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TEH_CODERER
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Posted: 3rd Sep 2007 12:55
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Ok, cool. I've just never worked with that before. Now I know! Thanks for the lesson!

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Aaron Miller
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Posted: 3rd Sep 2007 23:28
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No problem.


Cheers,

-naota

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Aralox
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Posted: 4th Sep 2007 12:09 Edited at: 4th Sep 2007 12:10
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Just a thought, wont this kind of thread get deleted because it dosent have the db version on it?
I wouldnt know really


EDIT: jsut realised that the name of the thread itself says 'Pure DBP'



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Aaron Miller
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Posted: 5th Sep 2007 04:05
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If a mod would like to edit to make it more clear, then that'd be fine.


Cheers,

-naota

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Aaron Miller
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Posted: 5th Sep 2007 09:29
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Excuse the double post, but I would also like to state I do plan on allowing an actual window image for this thing, however, I can't think of a speedy way to do what I need... Without coding a plugin. I mean, DirectX has the raw ability to do this exactly, in a speedy manner! Unfortunately DBP doesn't allow that control natively, I wish it did. DBP is a fine language (With some issues to work out, but fine none the less).



Cheers,

-naota

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Code Dragon
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Posted: 5th Sep 2007 23:43
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Thanks for posting this, I've never really understood how to use << and >> until now

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Aaron Miller
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Posted: 6th Sep 2007 05:26
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Thanks.

Cheers,

-naota

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calcyman
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Posted: 14th Nov 2007 17:33
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Very clever use of those logic operators. I would have used something like:

c as dword
c = (a*16777216)+(r*65536)+(g*256)+b

However, yours seems more elegant, and I'm surprised to see that DB can accept anything other than a boolean in AND/OR logic.

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Aaron Miller
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Posted: 14th Nov 2007 23:13
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Thanks. Your way is probably quicker for DBP considering DBP has to call a dll for each of it's basic operations (Such as the AND/OR, Multiply, Add, etc). :/

Cheers,

-naota

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aluseus GOD
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Posted: 16th Nov 2007 04:00
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so i saw this and started to ponder how it worked.
2 days later, im thinking d--n! How did you think of that?

alus.portbb.com go there.
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Aaron Miller
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Posted: 16th Nov 2007 04:04
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Bitwise operations on variable to place in AARRGGBB manner, where as each "double" is 1 byte, so 1 byte to alpha, 1 to red, 1 to green, and 1 to blue.

Cheers,

-naota

"I'd newbie slap here, but I've no idea how far I'd need slap before they'd come back with a clue." - VanB
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