08444: All lightgun games: Crosshair inputs ignore shader geometry

ID	Category [?]	Severity [?]	Reproducibility	Date Submitted	Last Update
08444	Interface	Minor	Always	Oct 18, 2022, 17:37	Nov 22, 2022, 02:25

Tester	ICEknight	View Status	Public	Platform	MAME (Official Binary)
Assigned To		Resolution	Open	OS	Windows 10/11 (64-bit)
Status [?]	Direction Needed			Driver
Version	0.248	Fixed in Version		Build	64-bit
		Fixed in Git Commit		Github Pull Request #

Summary	08444: All lightgun games: Crosshair inputs ignore shader geometry
Description	When using a shader that allows to modify the geometry of the simulated monitor by stretching its axis, tilting or changing its curvature, the crosshairs in light gun games will still react as if the picture doesn't have any shaders applied, interacting in the wrong places.
Steps To Reproduce	- Load a lightgun game (like pblank). - Select a shader (like hlsl or crt-geom) and change the values in any sliders related to the screen geometry (like Quadric Distortion Amount, Tilt X/Y or Overscan X/Y). - Press the Shoot button and the shot won't land where the crosshair is.
Additional Information	The correct behavior would also make it possible to shoot outside the screen, something that currently can't be done in all games: https://mametesters.org/view.php?id=8433
Github Commit

Flags
Regression Version
Affected Sets / Systems	All lightgun games

Attached Files	example crt-geom.jpg (766,177 bytes) Oct 18, 2022, 17:38 Uploaded by ICEknight
Attached Files	detail crt-geom.jpg (33,049 bytes) Oct 18, 2022, 17:38 Uploaded by ICEknight

No.20627 Tafoid Administrator Oct 19, 2022, 13:28	Maybe I misunderstand, but would it be expected that a game using a lightgun or similar aim/shoot interface may not work correctly using post emulation shader effects that skew or otherwise change the screen? Would the aiming not assume that a game is properly ratio'd and not modified from expected presentation?
No.20850 twosix Tester Nov 22, 2022, 02:25	I think the purpose of shaders like HLSL are to provide a nostalgic or different visual experience. From this perspective, I don't think it's expected that enabling them would negatively impact gameplay. To me it makes sense that intuitively the size and shape of the screen would match the size and shape of the aiming "input space". But I can't speak for the technical difficulty involved...