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Old 03 March 2003, 21:48   #1
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Question Strange problem with Imagine 4 FP


Please excuse me, but I have a strange problem with Imagine 4 FPU version...

For any object, if I put a SPECULAR above 0, the program didn't render a light spot but a great monochrome circle.

Is this a FPU bug?
Old 04 March 2003, 10:43   #2
Toni Wilen
WinUAE developer
Join Date: Aug 2001
Location: Hämeenlinna/Finland
Age: 45
Posts: 24,048
More information, thanks..

Does switching JIT on/off have any effect, CPU type etc...
WinUAE version.
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Old 04 March 2003, 12:17   #3
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I'm using the latest WinUAE in 68040 Mode. I tryed removing JIT effects, but the problem remains

Thank you.
Old 16 March 2003, 11:04   #4
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I also have that problem! I've encountered it in every version of WinUAE I've used. I kept meaning to post about it before but always forgot.

Misc info:
* does not occur on my real Amiga 2000 (+ 030/882)
* occured in pre-JIT versions of WinUAE
* occurs in both Imagine 3 and 4
* occurs only in the FPU versions of Imagine
* occurs under all CPU and chipset settings
* occurs under both kickstart/Workbench 2.0 and 3.1

I've attached a couple rendered pics that illustrate the problem...
Attached Thumbnails
Click image for larger version

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Old 16 March 2003, 11:07   #5
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YES! It's it!!!!

So, it's really a FPU emulation bug!
Old 16 March 2003, 11:54   #6
Toni Wilen
WinUAE developer
Join Date: Aug 2001
Location: Hämeenlinna/Finland
Age: 45
Posts: 24,048
Can someone write simple step-by-step instructions to reproduce this bug?
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Old 16 March 2003, 12:01   #7
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Nothing special: just create a simple object, and in his ATTRIBUTES put a SPECULAR value different from zero.

Then make a render...and the risult is above...

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