input_common/sdl: add support for binding button to axis
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		| @@ -19,7 +19,13 @@ const char* sdl2_config_file = R"( | ||||
| #      - "joystick": the index of the joystick to bind | ||||
| #      - "button"(optional): the index of the button to bind | ||||
| #      - "hat"(optional): the index of the hat to bind as direction buttons | ||||
| #      - "axis"(optional): the index of the axis to bind | ||||
| #      - "direction"(only used for hat): the direction name of the hat to bind. Can be "up", "down", "left" or "right" | ||||
| #      - "threshould"(only used for axis): a float value in (-1.0, 1.0) which the button is | ||||
| #          triggered if the axis value crosses | ||||
| #      - "direction"(only used for axis): "+" means the button is triggered when the axis value | ||||
| #          is greater than the threshold; "-" means the button is triggered when the axis value | ||||
| #          is smaller than the threshold | ||||
| button_a= | ||||
| button_b= | ||||
| button_x= | ||||
|   | ||||
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