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Bug Reports / DWord Maths issue

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RiiDii
20
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Joined: 20th Jan 2005
Location: Inatincan
Posted: 19th Feb 2009 02:49
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I have upgraded to 1.072
I checked the bug boards too
Here is another math issue

a as DWord
b as DWord
c as DWord
a=Rgb(255,255,255)
b=5 (or pick a number)
c=a/b
I get c=0




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James H
18
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Joined: 21st Apr 2007
Location: St Helens
Posted: 19th Feb 2009 04:44 Edited at: 19th Feb 2009 04:45
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This is weird, same results here but when I replaced "rgb(255,255,255)" with just "5", the resolution matches my desktop, if I don`t it runs at 640*480. Using standard ide and synergy(not DGS version) with same update version - windowed fullscreen is selected, yet both the window and fullscreen options are set to 640*480. Anyone else get the same?
If I change "rgb(255,255,255)" with r or g values of 254 I get a number thats the same value as the variable "A" except the last digits are different.R value 254=changes last 5 digits, G value 254=changes last 3 digits. B value of 254 returns a result of 0.
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RiiDii
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Joined: 20th Jan 2005
Location: Inatincan
Posted: 21st Feb 2009 17:57 Edited at: 21st Feb 2009 17:59
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James H, that is very weird.

For those not sure what the issue is. The resolution changes based on the value of variable 'a' - either RGB(255,255,255) or 5.

Run this first with attention to the resolution:



Then run this with attention to the resolution:



If you add this line in, the resolution doesn't change.

Print Screen Width()


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calcyman
17
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Joined: 31st Aug 2007
Location: The Uncertainty Principle
Posted: 22nd Feb 2009 19:52
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No, the resolution does not change based on the contents of a - it changes because of the RGB() function. By setting a to the value of 4294967295 (2^32-1), it behaves the same as setting it to 5.

Personally this appears obvious - the RGB() command uses the bit depth of the screen, which is directly related to the screen resolution.

Compare these, which have different resolutions, despite maintaining the same value in a.





The optimist's right, The pessimist's right.
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IanM
Retired Moderator
22
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Joined: 11th Sep 2002
Location: In my moon base
Posted: 28th Feb 2009 00:12
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There is a bug here, but it's not RGB. The resolution change is simply happening because DirectX is being initialised. Without that then DBPro sticks with the standard windows GDI.

Here's code showing the issue:


What I've discovered is happening is that 'a' contains the equivalent of the signed integer value -1. -1/5 in integer maths is zero.

If you look at the .dbm file generated for this code, you'll see the assembly instruction 'IDIV' - integer division.

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YarSnez
22
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Posted: 27th Mar 2009 11:53
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DB DWORDS seem to have the curious range 0 to 2,147,483,647
instead of 0 to 4,294,967,295 ?

I have very simple tastes, I am always satisfied with the very best.

Oscar Wilde.
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n008
18
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Joined: 18th Apr 2007
Location: Chernarus
Posted: 27th Mar 2009 16:24 Edited at: 27th Mar 2009 16:25
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Weird.

"I have faith, that I shall win the race, even though I have no legs, and am tied to a tree." ~Mark75
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