05067: galpani4 & clones: Supernova Gals Panic series: Big performance hit when you press button 1 on older PCs

ID	Category [?]	Severity [?]	Reproducibility	Date Submitted	Last Update
05067	Core	Minor	Always	Nov 27, 2012, 21:51	Nov 29, 2012, 21:50

Tester	moa	View Status	Public	Platform	MAME (Official Binary)
Assigned To		Resolution	Open	OS	Windows Vista/7 (64-bit)
Status [?]	Acknowledged			Driver	kaneko/suprnova.cpp
Version	0.147u3	Fixed in Version		Build	64-bit
		Fixed in Git Commit		Github Pull Request #

Summary	05067: galpani4 & clones: Supernova Gals Panic series: Big performance hit when you press button 1 on older PCs
Description	My test machine is a 3.20ghz Prescott Pentium 4 With any of the Gals Panic series, I have a major speed hit each time I press the button 1 to draw a line otherwise, the game is solid 60fps Affected sets are all the Gals Panic series of suprnova.c the other Supernova games seems OK but I haven't tested them all
Steps To Reproduce
Additional Information
Github Commit

Flags
Regression Version
Affected Sets / Systems	galpani4 & clones

Attached Files

No.09104 NekoEd Senior Tester Nov 27, 2012, 22:25	I do note underruns on my i5-2520M, but it never dropped below 100% so no performance issues here. A late P4 shouldn't be too bad, but hit F11 and check the speed. If AFS kicks up or it doesn't run 100% then your machine is probably just a bit behind the curve, unfortunately.
No.09105 Tafoid Administrator Nov 27, 2012, 23:21	You get the same slowdown, it looks like, when starting the game (during the Super Kaneko Nova System intro). Here I get about 63% speed on my Athlon64 X2 4400.. with frameskip it improves a very little bit. Emulation is fine, the performance (surrounding tilemap writing according to my tests) might not be something that can be coded around. I'll acknowledge the behavior, but not sure if this should be considered an emulation bug.
No.09108 Haze Senior Tester Nov 29, 2012, 21:50 edited on: Nov 29, 2012, 21:52	It's the tilemap dirty marking, the game uses RAM based tiles for the line drawing, so you start to draw a line and the tiles become dirty, because the tiles are dirty the tilemap ends up being marked as dirty, because the tilemap is dirty it all gets recalculated.. (there's no reason it should be significantly slower now than it ever has been relative to everything else tho?)