Add MouseButtonCallback

graphics/glfw/src/main/java/de/staropensource/sosengine/graphics/glfw/callbacks/MouseButtonCallback.java

@@ -0,0 +1,86 @@
+/*
+ * STAROPENSOURCE ENGINE SOURCE FILE
+ * Copyright (c) 2024 The StarOpenSource Engine Contributors
+ * Licensed under the GNU Affero General Public License v3
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU Affero General Public License as
+ * published by the Free Software Foundation, either version 3 of the
+ * License, or (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU Affero General Public License for more details.
+ *
+ * You should have received a copy of the GNU Affero General Public License
+ * along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
+package de.staropensource.sosengine.graphics.glfw.callbacks;
+
+import de.staropensource.sosengine.graphics.classes.Window;
+import de.staropensource.sosengine.graphics.events.InputEvent;
+import de.staropensource.sosengine.graphics.glfw.classes.WindowCallback;
+import de.staropensource.sosengine.graphics.types.input.Key;
+import de.staropensource.sosengine.graphics.types.input.KeyState;
+import org.jetbrains.annotations.NotNull;
+import org.lwjgl.glfw.GLFWMouseButtonCallbackI;
+
+import static org.lwjgl.glfw.GLFW.*;
+
+/**
+ * A {@link GLFWMouseButtonCallbackI} implementation.
+ *
+ * @since v1-alpha2
+ */
+@SuppressWarnings({ "unused" })
+public class MouseButtonCallback extends WindowCallback implements GLFWMouseButtonCallbackI {
+    /**
+     * A {@link InputEvent} instance, to avoid creating too many objects
+     * and making too many allocations, which would potentially decrease
+     * performance.
+     *
+     * @since v1-alpha2
+     */
+    private final InputEvent event = new InputEvent();
+
+    /**
+     * Constructs this class.
+     *
+     * @param window {@link Window} class
+     * @since v1-alpha2
+     */
+    public MouseButtonCallback(@NotNull Window window) {
+        super(window);
+    }
+
+    /** {@inheritDoc} */
+    @Override
+    public void invoke(long window, int key, int action, int mods) {
+        // Ignore GLFW_REPEAT action
+        if (action == GLFW_REPEAT)
+            return;
+
+        event.callEvent(
+                // Attached window
+                getAttachedWindow(),
+
+                // Key
+                switch (key) {
+                    case GLFW_MOUSE_BUTTON_LEFT -> Key.MOUSE_LEFT;
+                    case GLFW_MOUSE_BUTTON_MIDDLE -> Key.MOUSE_MIDDLE;
+                    case GLFW_MOUSE_BUTTON_RIGHT -> Key.MOUSE_RIGHT;
+                    case GLFW_MOUSE_BUTTON_4, GLFW_MOUSE_BUTTON_5,
+                         GLFW_MOUSE_BUTTON_6, GLFW_MOUSE_BUTTON_7,
+                         GLFW_MOUSE_BUTTON_8 -> Key.UNKNOWN_MOUSE;
+                    default -> throw new IllegalStateException("Mouse button " + key + " is invalid");
+                },
+                // Key state
+                switch (action) {
+                    case GLFW_PRESS -> KeyState.PRESSED;
+                    case GLFW_RELEASE -> KeyState.RELEASED;
+                    default -> throw new IllegalStateException("Action " + action + " is invalid");
+                });
+    }
+}

graphics/glfw/src/main/java/de/staropensource/sosengine/graphics/glfw/classes/GlfwWindow.java

@@ -28,6 +28,7 @@ import de.staropensource.sosengine.graphics.classes.Window;
 import de.staropensource.sosengine.graphics.events.GraphicsApiErrorEvent;
 import de.staropensource.sosengine.graphics.events.InputEvent;
 import de.staropensource.sosengine.graphics.glfw.callbacks.KeyCallback;
+import de.staropensource.sosengine.graphics.glfw.callbacks.MouseButtonCallback;
 import de.staropensource.sosengine.graphics.glfw.exceptions.NotOnMainThreadException;
 import de.staropensource.sosengine.graphics.glfw.exceptions.WindowCreationFailureException;
 import de.staropensource.sosengine.graphics.types.window.VsyncMode;
@@ -35,6 +36,7 @@ import de.staropensource.sosengine.graphics.types.window.WindowMode;
 import lombok.Getter;
 import org.jetbrains.annotations.NotNull;
 import org.lwjgl.glfw.GLFWKeyCallback;
+import org.lwjgl.glfw.GLFWMouseButtonCallback;
 import org.lwjgl.system.MemoryStack;
 import org.lwjgl.system.MemoryUtil;
 
@@ -70,6 +72,13 @@ public abstract class GlfwWindow extends Window {
      */
     private GLFWKeyCallback keyCallback;
 
+    /**
+     * Contains the {@link GLFWMouseButtonCallback} used for emitting {@link InputEvent}s.
+     *
+     * @since v1-alpha2
+     */
+    private GLFWMouseButtonCallback mouseButtonCallback;
+
     // ------------------------------------------------ [ Window (de)initialization ] ------------------------------------------------ //
     /**
      * Creates a new window.
@@ -159,9 +168,11 @@ public abstract class GlfwWindow extends Window {
 
         // Create callbacks
         keyCallback = GLFWKeyCallback.create(new KeyCallback(this));
+        mouseButtonCallback = GLFWMouseButtonCallback.create(new MouseButtonCallback(this));
 
         // Set callback
         glfwSetKeyCallback(identifierLong, keyCallback);
+        glfwSetMouseButtonCallback(identifier, mouseButtonCallback);
 
         // Update the window state
         setSize(getSize());
@@ -182,6 +193,7 @@ public abstract class GlfwWindow extends Window {
 
         // Close callbacks
         keyCallback.close();
+        mouseButtonCallback.close();
 
         // Destroy the window
         glfwDestroyWindow(identifierLong);