What's the connection between FULLDOUBLE and stuttering sound? \ VOGONS

What's the connection between FULLDOUBLE and stuttering sound?

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First post, by TazDevil76

Posted on 2005-01-15, 15:31

TazDevil76 Offline

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Hi,

another topic: when I run my old game "Ferris - The Wanderer" in windowed mode or fullscreen w/o double buffering everything's fine except the scrolling. The game uses 320x200 ModeX with hardware scrolling (ultrasmooth 😀).
When I set FULLDOUBLE=TRUE the scrolling is as soft as I expect it to be but sound begins to stutter. Sound comes from a MOD player. Music plays about 2 seconds, makes a break and continous and so on.
Setting prebuffering, samplerate, sound card type and speed to another value won't help.

Setting FRAMESKIP to 1 solves the problem but then the scrolling is messy again. What does that mean? Might this be an interrupt problem?

If you want to try get the game here: http://www.wildsau.net/downloads/m0019230.ZIP

Thanks.

René

P.S.: My machine is a AMD XP 3000+.

Reply 1 of 8, by robertmo

Posted on 2005-01-15, 16:26

robertmo Offline

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read "dosbox guides" - "how to speed up dosbox"

Reply 2 of 8, by TazDevil76

Posted on 2005-01-15, 17:25

TazDevil76 Offline

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Funny! Here it won't start now at all! I get a runtime error 100! 🙁

Reply 3 of 8, by TazDevil76

Posted on 2005-01-15, 21:32

TazDevil76 Offline

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Okay, I read it.
No success. The problem occurs as soon as I choose SURFACE in combination with double buffering and fullscreen. In window mode everything's fine.
Lowering the sample rate to 5000 won't help.
I tried adjusting the cycles by checking the task manager. But even setting them to 100.000 (which give 95% on my PC) doesn't influence the problem at all. It's not getting better and not worse, no matter what I try.

Maybe it just doesn't work and I'll have to accept it. 🙁

Thanks anyway.

René

Reply 4 of 8, by Harekiet

Posted on 2005-01-15, 22:43

Harekiet Offline

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SDL's double buffering code ain't exactly nice, try forcing the videomode your gonna use to the highest possible refresh rate for you monitor that should cut down on some overhead.

Reply 5 of 8, by TazDevil76

Posted on 2005-01-15, 22:46

TazDevil76 Offline

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My monitor is an LCD so I'm stuck with 60Hz!
The game itself uses 320x200 ModeX, DosBox runs at 1024x768...

Reply 6 of 8, by Harekiet

Posted on 2005-01-16, 08:10

Harekiet Offline

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Hehe 60hz sucks since it'll try synching a 70hz dos game with your 60hz screen will give lot's of delays 😀

Reply 7 of 8, by TazDevil76

Posted on 2005-01-16, 09:55

TazDevil76 Offline

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Hmmmm....if the emulation is really correct then the game should run at 60Hz since I have code in it to change the refresh rate to this value.
Or is full screen always at 70Hz?

Reply 8 of 8, by Harekiet

Posted on 2005-01-16, 10:00

Harekiet Offline

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Well find a debug build of dosbox then you can see what dosbox thinks the fps of the dos game is, but most old dos games all run at 70hz unless they used a tweaked vga mode like 320x240 which would get you 60hz normally. then again if it's 61 hz it's already faster than your lcd and fucking up synching big time 😀

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