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Prevent double input events on gamepad when running through steam input

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During GDC and general testing on Steam Deck units, we found that single
gamepads would often register inputs twice under certain circumstances.
This was caused by SteamInput creating a new virtual device, which Godot
registers as a second gamepad. This resulted in two gamepad devices
reporting the same button presses, often leading to buggy input response
on games with no multi-device logic and other-wise could cause intended
Steam rebindings to not work as intended (for example, swapping o and x
on a playstation pad if that feature isn't supported by the game.)

SDL gets around this by taking in a list of devices that are to be
ignored. When valve sees a controller that wants to be rebound via
SteamInput, they push a new VID/PID entry onto the environment
variable `SDL_GAMECONTROLLER_IGNORE_DEVICES` for the original gamepad
so that all game inputs can be read from the virtual gamepad instead.

This leverages the same logic as we are already using SDL gamepad
related HID mappings.
This commit is contained in:
Eoin O'Neill
2023-04-13 22:18:04 -07:00
parent 3710f06929
commit 8de98dbf21
4 changed files with 50 additions and 4 deletions
Download Patch File Download Diff File Expand all files Collapse all files

14
platform/linuxbsd/joypad_linux.cpp
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@@ -391,6 +391,16 @@ void JoypadLinux::open_joypad(const char *p_path) {
return;
}
uint16_t vendor = BSWAP16(inpid.vendor);
uint16_t product = BSWAP16(inpid.product);
uint16_t version = BSWAP16(inpid.version);
if (input->should_ignore_device(vendor, product)) {
// This can be true in cases where Steam is passing information into the game to ignore
// original gamepads when using virtual rebindings (See SteamInput).
return;
}
MutexLock lock(joypads_mutex[joy_num]);
Joypad &joypad = joypads[joy_num];
joypad.reset();
@@ -399,10 +409,6 @@ void JoypadLinux::open_joypad(const char *p_path) {
setup_joypad_properties(joypad);
sprintf(uid, "%04x%04x", BSWAP16(inpid.bustype), 0);
if (inpid.vendor && inpid.product && inpid.version) {
uint16_t vendor = BSWAP16(inpid.vendor);
uint16_t product = BSWAP16(inpid.product);
uint16_t version = BSWAP16(inpid.version);
sprintf(uid + String(uid).length(), "%04x%04x%04x%04x%04x%04x", vendor, 0, product, 0, version, 0);
input->joy_connection_changed(joy_num, true, name, uid);
} else {