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Fairchild Channel F and HLSL
#391065 - 06/15/21 04:27 PM
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Hi, all!
I've just started using HLSL to get that classic scan line look, and it works a treat — most of the time.
However, I'm trying to get my channelf games to quadruple their scan lines (like the original console did). Not having any luck, though. The prescale option seems to do nothing, even though it seems like exactly what I want.
Any clues?
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Re: Fairchild Channel F and HLSL
[Re: Atario]
#391073 - 06/16/21 10:12 PM
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Prescale is used for making pixels look less blurry when no shaders are active (making the filtering less obvious when upscaling the emulated output to the full resolution of the used display), I don't think it will have much (any?) effect with HLSL, crt-geom, etc. Scanlines (or rather, the used mask) will always stay in their proper positions unless something goes wrong.
What do you mean that the Channel F "quadruples the scanlines"? Do you have any pictures of this effect on real hardware?
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Re: Fairchild Channel F and HLSL
[Re: ICEknight]
#391077 - 06/17/21 07:15 AM
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Re: Fairchild Channel F and HLSL
[Re: Atario]
#391097 - 06/18/21 09:08 PM
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Here's a direct comparison of real hardware versus current emulation:
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Re: Fairchild Channel F and HLSL
[Re: ICEknight]
#391099 - 06/18/21 09:42 PM
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> Here's a direct comparison of real hardware versus current emulation:
I guess the issue is that MAME treats the output resolution at 102x58
AFAIK No CRT is going to sync to a display of 58 lines, so the hardware doesn't output 58 lines.
It outputs the same line 4 times before switching to the next to give a much more reasonable 232
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Re: Fairchild Channel F and HLSL
[Re: Haze]
#391104 - 06/19/21 03:27 AM
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> > It outputs the same line 4 times before switching to the next to give a much more > reasonable 232
There's a recent write up of the video hardware over at https://forums.nesdev.com/viewtopic.php?f=23&t=20475 , so it seems PAL machines output the same line 5 times.
Looks like the driver could do with an update based on this new information.
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Re: Fairchild Channel F and HLSL
[Re: ICEknight]
#391108 - 06/19/21 10:11 AM
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ICEknight, can I ask what your HLSL settings are? Those look nicer than mine…
Also, your snapshot came out with the aspect ratio okay, how'd you do that?
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Re: Fairchild Channel F and HLSL
[Re: Atario]
#391136 - 06/22/21 10:09 PM
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I'm using crt-geom, instead of HLSL.
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Re: Fairchild Channel F and HLSL
[Re: Atario]
#391152 - 06/26/21 02:21 PM
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Re: Fairchild Channel F and HLSL
[Re: Robbbert]
#391154 - 06/27/21 01:55 AM
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