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Forums > C64 Coding > Effect based on the last visible raster line (PAL system)
2024-06-08 19:31
Gordian

Registered: May 2022
Posts: 43
Effect based on the last visible raster line (PAL system)

Hello,

I've created simple effect which is based on bounce easing function. Maximum value is $12c (399) - this is last visible rasterline using full borders in VIC and is edge of bouncing.

Does it make sense to assume that the line is always visible (and very last) on every displaying PAL device?
 
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2024-06-08 20:40
Gordian

Registered: May 2022
Posts: 43
Quote: you could just move up the effect a bit?

No:) It is based on the assumption that there is nothing visible below "the last line" (and vice versa - visible screen area is placed above).
2024-06-09 07:58
Raistlin

Registered: Mar 2007
Posts: 578
The reason Commodore, and others, had a border in the first place is that the edges of the screen are unreliable on old TVs. Even if you bought the same TV, same version, etc etc, you could get variances.

Commodore were OTT with the size of the border, sure, but some of it is aesthetics too.

I always test demo stuff in “full” border mode on VICE, to make sure there’s no badness outside the normal view. Then I aim for “normal” border mode. Check Bonzai’s all-border DYPP in Unboxed to see a mistake in not testing on “full” border mode :-)
2024-06-09 10:32
WVL

Registered: Mar 2002
Posts: 887
Quote: Quote:

Still $12c sounds like a decent choice for what you want to do :)

If it may happen that the area between $11c and $12b will be cut off I might as well just throw the idea away now.

Thanks for the link!


You could allow the 'user' to calibrate the effect? 'Move ball down with joystick until it touches the lower edge of the screen'.
2024-06-09 10:57
Gordian

Registered: May 2022
Posts: 43
Quote: You could allow the 'user' to calibrate the effect? 'Move ball down with joystick until it touches the lower edge of the screen'.

Hmm... The effect is basic screen fader, so it could be slightly irritating:)
I'm just gonna use other easing function, without bouncing.
2024-06-10 08:13
Gordian

Registered: May 2022
Posts: 43
Is there any possibility to set range of full borders in VICE? Or it could be an option for the future?
2024-06-10 13:31
Jetboy

Registered: Jul 2006
Posts: 232
There are 3 presets.
2024-06-10 13:45
Gordian

Registered: May 2022
Posts: 43
Quote: There are 3 presets.

Jetboy, where can I find them?
2024-06-10 14:48
Krill

Registered: Apr 2002
Posts: 2856
Quoting Raistlin
Commodore were OTT with the size of the border, sure, but some of it is aesthetics too.
No. Have a look at NTSC output - borders are rather small.

PAL border sizes are most likely an artefact of technical constraints like 320x200 main window vs. pixel clock vs. PAL specs.
2024-06-11 08:16
Jetboy

Registered: Jul 2006
Posts: 232
Quote: Jetboy, where can I find them?

preferences/settings/display/vic-ii/border mode

Sorry it took so long, but i was away from my vice.
2024-06-11 08:26
Gordian

Registered: May 2022
Posts: 43
Quote: preferences/settings/display/vic-ii/border mode

Sorry it took so long, but i was away from my vice.


Thanks, I know it:) But I'm looking for possibility of changing range of "full border" option which is by default set to $008-$12c.
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