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Merge pull request #2667 from wwylele/button_from_axis
input_common/sdl: add support for binding button to axis
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commit
c5126f51dd
@ -19,7 +19,13 @@ const char* sdl2_config_file = R"(
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# - "joystick": the index of the joystick to bind
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# - "button"(optional): the index of the button to bind
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# - "hat"(optional): the index of the hat to bind as direction buttons
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# - "axis"(optional): the index of the axis to bind
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# - "direction"(only used for hat): the direction name of the hat to bind. Can be "up", "down", "left" or "right"
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# - "threshould"(only used for axis): a float value in (-1.0, 1.0) which the button is
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# triggered if the axis value crosses
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# - "direction"(only used for axis): "+" means the button is triggered when the axis value
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# is greater than the threshold; "-" means the button is triggered when the axis value
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# is smaller than the threshold
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button_a=
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button_b=
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button_x=
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@ -8,6 +8,7 @@
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#include <tuple>
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#include <unordered_map>
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#include <SDL.h>
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#include "common/logging/log.h"
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#include "common/math_util.h"
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#include "input_common/sdl/sdl.h"
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@ -40,12 +41,16 @@ public:
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return SDL_JoystickGetButton(joystick.get(), button) == 1;
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}
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std::tuple<float, float> GetAnalog(int axis_x, int axis_y) const {
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float GetAxis(int axis) const {
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if (!joystick)
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return {};
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SDL_JoystickUpdate();
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float x = SDL_JoystickGetAxis(joystick.get(), axis_x) / 32767.0f;
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float y = SDL_JoystickGetAxis(joystick.get(), axis_y) / 32767.0f;
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return SDL_JoystickGetAxis(joystick.get(), axis) / 32767.0f;
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}
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std::tuple<float, float> GetAnalog(int axis_x, int axis_y) const {
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float x = GetAxis(axis_x);
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float y = GetAxis(axis_y);
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y = -y; // 3DS uses an y-axis inverse from SDL
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// Make sure the coordinates are in the unit circle,
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@ -97,6 +102,27 @@ private:
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Uint8 direction;
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};
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class SDLAxisButton final : public Input::ButtonDevice {
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public:
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explicit SDLAxisButton(std::shared_ptr<SDLJoystick> joystick_, int axis_, float threshold_,
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bool trigger_if_greater_)
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: joystick(joystick_), axis(axis_), threshold(threshold_),
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trigger_if_greater(trigger_if_greater_) {}
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bool GetStatus() const override {
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float axis_value = joystick->GetAxis(axis);
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if (trigger_if_greater)
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return axis_value > threshold;
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return axis_value < threshold;
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}
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private:
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std::shared_ptr<SDLJoystick> joystick;
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int axis;
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float threshold;
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bool trigger_if_greater;
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};
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class SDLAnalog final : public Input::AnalogDevice {
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public:
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SDLAnalog(std::shared_ptr<SDLJoystick> joystick_, int axis_x_, int axis_y_)
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@ -130,8 +156,14 @@ public:
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* - "joystick": the index of the joystick to bind
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* - "button"(optional): the index of the button to bind
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* - "hat"(optional): the index of the hat to bind as direction buttons
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* - "axis"(optional): the index of the axis to bind
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* - "direction"(only used for hat): the direction name of the hat to bind. Can be "up",
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* "down", "left" or "right"
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* "down", "left" or "right"
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* - "threshould"(only used for axis): a float value in (-1.0, 1.0) which the button is
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* triggered if the axis value crosses
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* - "direction"(only used for axis): "+" means the button is triggered when the axis value
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* is greater than the threshold; "-" means the button is triggered when the axis value
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* is smaller than the threshold
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*/
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std::unique_ptr<Input::ButtonDevice> Create(const Common::ParamPackage& params) override {
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const int joystick_index = params.Get("joystick", 0);
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@ -155,6 +187,23 @@ public:
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direction);
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}
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if (params.Has("axis")) {
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const int axis = params.Get("axis", 0);
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const float threshold = params.Get("threshold", 0.5f);
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const std::string direction_name = params.Get("direction", "");
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bool trigger_if_greater;
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if (direction_name == "+") {
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trigger_if_greater = true;
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} else if (direction_name == "-") {
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trigger_if_greater = false;
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} else {
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trigger_if_greater = true;
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LOG_ERROR(Input, "Unknown direction %s", direction_name.c_str());
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}
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return std::make_unique<SDLAxisButton>(GetJoystick(joystick_index), axis, threshold,
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trigger_if_greater);
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}
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const int button = params.Get("button", 0);
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return std::make_unique<SDLButton>(GetJoystick(joystick_index), button);
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}
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