feat: add imgui

app/build.gradle

@@ -16,8 +16,10 @@ repositories {
     mavenCentral()
 }
 
+def os = "linux";
 def lwjgl_version = "3.3.6"
-def lwjgl_natives = "natives-linux"
+def lwjgl_natives = "natives-$os"
+def imgui_version = "1.87.0"
 
 dependencies {
     // Use JUnit Jupiter for testing.
@@ -33,6 +35,10 @@ dependencies {
     implementation "org.lwjgl:lwjgl-opengl::$lwjgl_natives"
     implementation "org.lwjgl:lwjgl-glfw::$lwjgl_natives"
     implementation "org.lwjgl:lwjgl-assimp::$lwjgl_natives"
+
+    implementation "io.github.spair:imgui-java-binding:$imgui_version"
+    implementation "io.github.spair:imgui-java-natives-$os:$imgui_version"
+    implementation "io.github.spair:imgui-java-app:$imgui_version"
 }
 
 application {

app/src/main/java/chess/view/DDDrender/Window.java

@@ -7,9 +7,14 @@ import org.lwjgl.opengl.*;
 import org.lwjgl.system.*;
 
 import chess.model.Coordinate;
+import chess.view.AssetManager;
 import chess.view.DDDrender.world.Entity;
 import chess.view.DDDrender.world.World;
 import common.Signal1;
+import imgui.ImFontConfig;
+import imgui.ImGui;
+import imgui.gl3.ImGuiImplGl3;
+import imgui.glfw.ImGuiImplGlfw;
 
 import java.io.Closeable;
 import java.io.IOException;
@@ -26,11 +31,14 @@ import static org.lwjgl.opengl.GL11.*;
 import static org.lwjgl.system.MemoryStack.*;
 import static org.lwjgl.system.MemoryUtil.*;
 
-public class Window implements Closeable{
+public class Window implements Closeable {
 
 	// The window handle
 	private long window;
 
+	private final ImGuiImplGl3 implGl3 = new ImGuiImplGl3();
+	private final ImGuiImplGlfw implGlfw = new ImGuiImplGlfw();
+
 	private Renderer renderer;
 	private final Camera cam;
 	private final World world;
@@ -77,6 +85,37 @@ public class Window implements Closeable{
 		// Terminate GLFW and free the error callback
 		glfwTerminate();
 		glfwSetErrorCallback(null).free();
+
+		implGl3.shutdown();
+		implGlfw.shutdown();
+
+		ImGui.destroyContext();
+	}
+
+	private void setCallbacks() {
+		glfwSetMouseButtonCallback(this.window, (window, button, action, mods) -> {
+			if (button == GLFW_MOUSE_BUTTON_1 && action == GLFW_PRESS) {
+				if (this.lastCell.isValid())
+					this.OnCellClick.emit(this.lastCell);
+			}
+		});
+	}
+
+	private void initImGui() {
+		ImGui.setCurrentContext(ImGui.createContext());
+
+		implGl3.init("#version 330");
+		implGlfw.init(window, true);
+
+		ImFontConfig config = new ImFontConfig();
+		config.setFontDataOwnedByAtlas(false);
+		try {
+			ImGui.getIO().getFonts().addFontFromMemoryTTF(AssetManager.getResource("fonts/comic.ttf").readAllBytes(),
+					50.0f, config);
+		} catch (IOException e) {
+			// TODO Auto-generated catch block
+			e.printStackTrace();
+		}
 	}
 
 	private void init() {
@@ -114,10 +153,21 @@ public class Window implements Closeable{
 					window,
 					(vidmode.width() - pWidth.get(0)) / 2,
 					(vidmode.height() - pHeight.get(0)) / 2);
+
+			glfwSetWindowSize(window, vidmode.width(), vidmode.height());
 		} // the stack frame is popped automatically
 
 		// Make the OpenGL context current
 		glfwMakeContextCurrent(window);
+
+		GL.createCapabilities();
+
+		setCallbacks();
+
+		initImGui();
+
+		renderer.Init();
+
 		// Enable v-sync
 		glfwSwapInterval(1);
 
@@ -152,37 +202,31 @@ public class Window implements Closeable{
 		double x[] = new double[1];
 		double y[] = new double[1];
 		glfwGetCursorPos(this.window, x, y);
-		Vector2f cursorPos = this.cam.getCursorWorldFloorPos(new Vector2f((float) x[0], (float) y[0]), windowWidth, windowHeight);
+		Vector2f cursorPos = this.cam.getCursorWorldFloorPos(new Vector2f((float) x[0], (float) y[0]), windowWidth,
+				windowHeight);
 		Coordinate selectedCell = DDDPlacement.vectorToCoordinates(cursorPos);
 		if (this.lastCell == null) {
 			this.lastCell = selectedCell;
 			if (selectedCell.isValid())
 				this.OnCellEnter.emit(selectedCell);
-		}
-		else if (!this.lastCell.equals(selectedCell)) {
+		} else if (!this.lastCell.equals(selectedCell)) {
 			if (this.lastCell.isValid())
 				this.OnCellExit.emit(this.lastCell);
 			if (selectedCell.isValid())
 				this.OnCellEnter.emit(selectedCell);
 			this.lastCell = selectedCell;
 		}
-		glfwSetMouseButtonCallback(this.window, (window, button, action, mods) -> {
-			if (button == GLFW_MOUSE_BUTTON_1 && action == GLFW_PRESS) {
-				if (this.lastCell.isValid())
-					this.OnCellClick.emit(this.lastCell);
-			}
-		});
+	}
+
+	private void newFrame() {
+		glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT); // clear the framebuffer
+
+		implGlfw.newFrame();
+		implGl3.newFrame();
+		ImGui.newFrame();
 	}
 
 	private void loop() {
-		// This line is critical for LWJGL's interoperation with GLFW's
-		// OpenGL context, or any context that is managed externally.
-		// LWJGL detects the context that is current in the current thread,
-		// creates the GLCapabilities instance and makes the OpenGL
-		// bindings available for use.
-		GL.createCapabilities();
-
-		renderer.Init();
 
 		// Set the clear color
 		glClearColor(0.4f, 0.4f, 0.6f, 1.0f);
@@ -204,11 +248,17 @@ public class Window implements Closeable{
 		// Run the rendering loop until the user has attempted to close
 		// the window or has pressed the ESCAPE key.
 		while (!glfwWindowShouldClose(window)) {
-			glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT); // clear the framebuffer
+
+			newFrame();
 
 			double currentTime = glfwGetTime();
 			float deltaTime = (float) (currentTime - lastTime);
 			render(deltaTime, (float) width[0] / (float) height[0]);
+
+			// ImGui.showDemoWindow();
+			ImGui.render();
+			implGl3.renderDrawData(ImGui.getDrawData());
+
 			lastTime = glfwGetTime();
 
 			glfwSwapBuffers(window); // swap the color buffers