Fix bug of connection event of gamepad at startup #730
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Haha oops. Thanks for catching this :) |
cart
reviewed
Oct 28, 2020
examples/input/gamepad_input.rs
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| use bevy_input::gamepad::{Gamepad, GamepadButton, GamepadEvent, GamepadEventType}; | ||
| use bevy_utils::HashSet; | ||
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| fn main() { | ||
| App::build() | ||
| .add_default_plugins() | ||
| .init_resource::<GamepadLobby>() | ||
| .add_startup_system(connection_system.system()) | ||
| .add_startup_system_to_stage(POST_STARTUP, connection_system.system()) |
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I'm assuming you're adding this duplicate system here in case gamepad_system runs before connection system?
Could we just have a single add_system_to_stage(PRE_UPDATE, connection_system.system()) instead?
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.add_system_to_stage(stage::PRE_UPDATE, connection_system.system()) works fine (tested it too)
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First commit removes the floating point equality comparison by modifying the filter function. Now filter function outputs
Option<f32>instead off32and output isNonewhen no change is required.Second commit fixes the bug which makes it impossible to detect already connected gamepads at game startup. If you plug the gamepad first and then launches the game, connection event wouldn't occur. Removal of this code causes this bug.
To detect already connected gamepads' connection events at startup, a system must query for events at
POST_STARTUPstage becausebevy_gilrsgenerates raw events atPRE_STARTUPstage andbevy_inputgenerates filtered events atSTARTUPstage (it must execute afterbevy_gilrssystem).