snuvi-engine/src/me/hammerle/snuviengine/api/Gamepad.java

package me.hammerle.snuviengine.api;

import java.nio.ByteBuffer;
import java.nio.FloatBuffer;
import static org.lwjgl.glfw.GLFW.*;

public final class Gamepad {
    public static final class GamepadButton {
        private final String name;
        private final int mapping;

        private boolean isDown = false;
        private int time = 0;
        private boolean isReleased = false;

        protected GamepadButton(String name, int mapping) {
            this.name = name;
            this.mapping = mapping;
        }

        public String getName() {
            return name;
        }

        protected int getMapping() {
            return mapping;
        }

        protected void tick(boolean isDown) {
            if(isReleased) {
                isReleased = false;
                time = 0;
            }
            if(this.isDown && !isDown) {
                isReleased = true;
                time++;
            }
            this.isDown = isDown;
            if(isDown) {
                time++;
            }
        }

        public boolean isDown() {
            return isDown;
        }

        public boolean isReleased() {
            return isReleased;
        }

        public int getTime() {
            return time;
        }

        public void setTime(int time) {
            this.time = time;
        }
    }

    public final GamepadButton a = new GamepadButton("A", 1);
    public final GamepadButton b = new GamepadButton("B", 2);
    public final GamepadButton x = new GamepadButton("X", 0);
    public final GamepadButton y = new GamepadButton("Y", 3);
    public final GamepadButton l = new GamepadButton("L", 4);
    public final GamepadButton r = new GamepadButton("R", 5);
    public final GamepadButton start = new GamepadButton("Start", 9);
    public final GamepadButton select = new GamepadButton("Select", 8);
    public final GamepadButton left = new GamepadButton("Left", 0);
    public final GamepadButton right = new GamepadButton("Right", 0);
    public final GamepadButton up = new GamepadButton("Up", 1);
    public final GamepadButton down = new GamepadButton("Down", 1);

    private final GamepadButton[] buttons = new GamepadButton[]{
        a, b, x, y, l, r, start, select
    };

    public final GamepadButton[] bindings = new GamepadButton[]{
        a, b, x, y, l, r, start, select, left, right, up, down
    };

    public final int joystickId;

    protected Gamepad(int joystickId) {
        this.joystickId = joystickId;
    }

    protected void tick() {
        if(!glfwJoystickPresent(joystickId)) {
            return;
        }
        updateButtons();
        updateAxes();
    }

    private void updateButtons() {
        ByteBuffer buttonBuffer = glfwGetJoystickButtons(joystickId);
        if(buttonBuffer == null) {
            return;
        }
        for(GamepadButton binding : buttons) {
            binding.tick(buttonBuffer.get(binding.getMapping()) != 0);
        }
    }

    private void updateAxes() {
        FloatBuffer axesBuffer = glfwGetJoystickAxes(joystickId);
        if(axesBuffer == null) {
            return;
        }
        left.tick(axesBuffer.get(left.getMapping()) < -0.5f);
        right.tick(axesBuffer.get(right.getMapping()) > 0.5f);
        up.tick(axesBuffer.get(up.getMapping()) < -0.5f);
        down.tick(axesBuffer.get(down.getMapping()) > 0.5f);
    }
}