plateau qui tourne

app/build.gradle

@@ -8,7 +8,7 @@
 
 plugins {
     // Apply the application plugin to add support for building a CLI application in Java.
-    id 'application'
+    id "application"
 }
 
 repositories {
@@ -16,15 +16,26 @@ repositories {
     mavenCentral()
 }
 
+def lwjgl_version = "3.3.6"
+def lwjgl_natives = "natives-linux"
+
 dependencies {
     // Use JUnit Jupiter for testing.
-    testImplementation 'org.junit.jupiter:junit-jupiter:5.9.1'
+    testImplementation "org.junit.jupiter:junit-jupiter:5.9.1"
 
+    implementation "org.lwjgl:lwjgl:$lwjgl_version"
+    implementation "org.lwjgl:lwjgl-opengl:$lwjgl_version"
+    implementation "org.lwjgl:lwjgl-glfw:$lwjgl_version"
+    implementation "org.joml:joml:1.10.8"
+
+    implementation "org.lwjgl:lwjgl::$lwjgl_natives"
+    implementation "org.lwjgl:lwjgl-opengl::$lwjgl_natives"
+    implementation "org.lwjgl:lwjgl-glfw::$lwjgl_natives"
 }
 
 application {
     // Define the main class for the application.
-    mainClass = 'chess.App'
+    mainClass = "chess.App"
 }
 
 tasks.named('test') {

app/src/main/java/chess/App.java

@@ -3,12 +3,14 @@
  */
 package chess;
 
+import chess.render.*;
+
 public class App {
     public String getGreeting() {
         return "Hello World!";
     }
 
     public static void main(String[] args) {
-        System.out.println(new App().getGreeting());
+        new Window().run();
     }
 }

app/src/main/java/chess/render/Camera.java

@@ -0,0 +1,128 @@
+package chess.render;
+
+import org.joml.Matrix4f;
+import org.joml.Vector3f;
+
+public class Camera {
+    public static final float fov = 70.0f;
+    // should be changed to match screen
+    public static final float aspect = 1.0f;
+    public static final float zNear = 0.01f;
+    public static final float zFar = 100.0f;
+
+    private Vector3f pos;
+
+    private float yaw = 0.0f;
+    private float pitch = 0.0f;
+
+    public Camera() {
+        this.pos = new Vector3f(0, 2.0f, 0);
+        setRotation(0.0f, -3.14150f / 2.0f);
+    }
+
+    public void move(float x, float y) {
+        this.pos.x += x;
+        this.pos.y += y;
+    }
+
+    public void rotate(float yaw, float pitch) {
+        this.yaw += yaw;
+        this.pitch += pitch;
+    }
+
+    public Vector3f getPos() {
+        return pos;
+    }
+
+    public float getYaw() {
+        return yaw;
+    }
+
+    public float getPitch() {
+        return pitch;
+    }
+
+    public float getFov() {
+        return fov;
+    }
+
+    public void setX(float x) {
+        this.pos.x = x;
+    }
+
+    public void setY(float y) {
+        this.pos.y = y;
+    }
+
+    public void setZ(float z) {
+        this.pos.z = z;
+    }
+
+    public void setYaw(float yaw) {
+        this.yaw = yaw;
+    }
+
+    public void setPitch(float pitch) {
+        this.pitch = pitch;
+    }
+
+    public void reset() {
+        resetPosition();
+        resetRotation();
+    }
+
+    public void resetPosition() {
+        pos = new Vector3f(0.0f, 0.0f, 0.0f);
+    }
+
+    public void resetRotation() {
+        yaw = 0.0f;
+        pitch = 0.0f;
+    }
+
+    public void moveForward(float distance) {
+        pos.x += distance * (float) Math.cos(yaw);
+        pos.y += distance * (float) Math.sin(yaw);
+    }
+
+    public void moveRight(float distance) {
+        pos.x += distance * (float) Math.cos(yaw);
+        pos.y += distance * (float) Math.sin(yaw);
+    }
+
+    public void moveUp(float distance) {
+        pos.z += distance;
+    }
+
+    public void moveDown(float distance) {
+        pos.z -= distance;
+    }
+
+    public void addYaw(float angle) {
+        yaw += angle;
+    }
+
+    public void addPitch(float angle) {
+        pitch += angle;
+    }
+
+    public void setPosition(Vector3f pos) {
+        this.pos = pos;
+    }
+
+    public void setRotation(float yaw, float pitch) {
+        this.yaw = yaw;
+        this.pitch = pitch;
+    }
+
+    public Matrix4f getMatrix() {
+        Vector3f forward = new Vector3f(
+                (float) (Math.cos(yaw) * Math.cos(pitch)),
+                (float) (Math.sin(pitch)),
+                (float) (Math.sin(yaw) * Math.cos(pitch)));
+
+        return new Matrix4f()
+                .perspective((float) (Math.toRadians(fov)), aspect, zNear, zFar)
+                .lookAt(pos, forward, new Vector3f(0.0f, 1.0f, 0.0f));
+    }
+}

app/src/main/java/chess/render/ElementBuffer.java

@@ -0,0 +1,33 @@
+package chess.render;
+
+import org.lwjgl.opengl.GL30;
+
+public class ElementBuffer {
+	private int id;
+	private int indiciesCount;
+
+	public ElementBuffer(int[] indicies) {
+		this.indiciesCount = indicies.length;
+		this.id = GL30.glGenBuffers();
+		Bind();
+		GL30.glBufferData(GL30.GL_ELEMENT_ARRAY_BUFFER, indicies.length * 4, GL30.GL_STATIC_DRAW);
+		GL30.glBufferSubData(GL30.GL_ELEMENT_ARRAY_BUFFER, 0, indicies);
+		Unbind();
+	}
+
+	public void Destroy() {
+		GL30.glDeleteBuffers(this.id);
+	}
+
+	public void Bind() {
+		GL30.glBindBuffer(GL30.GL_ELEMENT_ARRAY_BUFFER, this.id);
+	}
+
+	public void Unbind() {
+		GL30.glBindBuffer(GL30.GL_ELEMENT_ARRAY_BUFFER, 0);
+	}
+
+	public int GetIndiciesCount() {
+		return this.indiciesCount;
+	}
+}

app/src/main/java/chess/render/Renderer.java

@@ -0,0 +1,123 @@
+package chess.render;
+
+import org.joml.Vector3f;
+import org.lwjgl.opengl.*;
+
+import static org.lwjgl.opengl.GL30.*;
+import chess.render.shader.BoardShader;
+
+public class Renderer {
+	private BoardShader shader;
+	private VertexArray vao;
+
+	private static int BOARD_WIDTH = 8;
+	private static int BOARD_HEIGHT = 8;
+	private static int BOARD_SIZE = BOARD_WIDTH * BOARD_HEIGHT;
+	private static int SQUARE_VERTEX_COUNT = 4;
+
+	public Renderer() {
+		this.shader = new BoardShader();
+	}
+
+	public void Init() {
+		shader.LoadShader();
+		InitBoard();
+	}
+
+	private float[] GetBoardPositions() {
+		float[] positions = new float[BOARD_SIZE * SQUARE_VERTEX_COUNT * 3];
+		for (int i = 0; i < BOARD_WIDTH; i++) {
+			for (int j = 0; j < BOARD_HEIGHT; j++) {
+				float x = i / (float) BOARD_WIDTH;
+				float dx = (i + 1) / (float) BOARD_WIDTH;
+				float z = j / (float) BOARD_HEIGHT;
+				float dz = (j + 1) / (float) BOARD_HEIGHT;
+
+				float trueX = 2 * x - 1;
+				float trueZ = 2 * z - 1;
+				float trueDX = 2 * dx - 1;
+				float trueDZ = 2 * dz - 1;
+
+				positions[(BOARD_WIDTH * i + j) * SQUARE_VERTEX_COUNT * 3] = trueX;
+				positions[(BOARD_WIDTH * i + j) * SQUARE_VERTEX_COUNT * 3 + 1] = 0.0f;
+				positions[(BOARD_WIDTH * i + j) * SQUARE_VERTEX_COUNT * 3 + 2] = trueZ;
+
+				positions[(BOARD_WIDTH * i + j) * SQUARE_VERTEX_COUNT * 3 + 3] = trueDX;
+				positions[(BOARD_WIDTH * i + j) * SQUARE_VERTEX_COUNT * 3 + 4] = 0.0f;
+				positions[(BOARD_WIDTH * i + j) * SQUARE_VERTEX_COUNT * 3 + 5] = trueZ;
+
+				positions[(BOARD_WIDTH * i + j) * SQUARE_VERTEX_COUNT * 3 + 6] = trueX;
+				positions[(BOARD_WIDTH * i + j) * SQUARE_VERTEX_COUNT * 3 + 7] = 0.0f;
+				positions[(BOARD_WIDTH * i + j) * SQUARE_VERTEX_COUNT * 3 + 8] = trueDZ;
+
+				positions[(BOARD_WIDTH * i + j) * SQUARE_VERTEX_COUNT * 3 + 9] = trueDX;
+				positions[(BOARD_WIDTH * i + j) * SQUARE_VERTEX_COUNT * 3 + 10] = 0.0f;
+				positions[(BOARD_WIDTH * i + j) * SQUARE_VERTEX_COUNT * 3 + 11] = trueDZ;
+			}
+		}
+		return positions;
+	}
+
+	private float[] GetBoardColors() {
+		float[] colors = new float[BOARD_SIZE * SQUARE_VERTEX_COUNT * 3];
+		for (int i = 0; i < BOARD_WIDTH; i++) {
+			for (int j = 0; j < BOARD_HEIGHT; j++) {
+				Vector3f color;
+				if ((i + j) % 2 != 0) {
+					color = new Vector3f(1.0f, 1.0f, 1.0f);
+				} else {
+					color = new Vector3f(0.0f, 0.0f, 0.0f);
+				}
+				int squareIndex = i * BOARD_WIDTH + j;
+				for (int k = 0; k < SQUARE_VERTEX_COUNT; k++) {
+					colors[squareIndex * SQUARE_VERTEX_COUNT * 3 + k * 3] = color.x;
+					colors[squareIndex * SQUARE_VERTEX_COUNT * 3 + k * 3 + 1] = color.y;
+					colors[squareIndex * SQUARE_VERTEX_COUNT * 3 + k * 3 + 2] = color.z;
+				}
+			}
+		}
+		return colors;
+	}
+
+	private int[] GetBoardIndicies() {
+		int[] indices = new int[BOARD_SIZE * 6];
+		for (int i = 0; i < BOARD_SIZE; i++) {
+			indices[i * 6] = i * 4;
+			indices[i * 6 + 1] = i * 4 + 1;
+			indices[i * 6 + 2] = i * 4 + 2;
+			indices[i * 6 + 3] = i * 4 + 1;
+			indices[i * 6 + 4] = i * 4 + 2;
+			indices[i * 6 + 5] = i * 4 + 3;
+		}
+		return indices;
+	}
+
+	private void InitBoard() {
+		ElementBuffer eBuffer = new ElementBuffer(GetBoardIndicies());
+		this.vao = new VertexArray(eBuffer);
+
+		VertexBuffer positionBuffer = new VertexBuffer(GetBoardPositions(), 3);
+		positionBuffer.AddVertexAttribPointer(0, 3, 0);
+
+		VertexBuffer colorBuffer = new VertexBuffer(GetBoardColors(), 3);
+		colorBuffer.AddVertexAttribPointer(1, 3, 0);
+
+		this.vao.Bind();
+		this.vao.BindVertexBuffer(positionBuffer);
+		this.vao.BindVertexBuffer(colorBuffer);
+		this.vao.Unbind();
+	}
+
+	public void Render(Camera cam) {
+		this.shader.Start();
+		this.shader.SetCamMatrix(cam.getMatrix());
+		RenderVao(vao);
+	}
+
+	public void RenderVao(VertexArray vertexArray) {
+		this.shader.Start();
+		vertexArray.Bind();
+		GL30.glDrawElements(GL30.GL_TRIANGLES, vertexArray.GetVertexCount(), GL_UNSIGNED_INT, 0);
+		vertexArray.Unbind();
+	}
+}

app/src/main/java/chess/render/VertexArray.java

@@ -0,0 +1,47 @@
+package chess.render;
+
+import java.util.ArrayList;
+import java.util.List;
+
+import org.lwjgl.opengl.GL30;
+
+public class VertexArray {
+	private int id;
+	private ElementBuffer elementBuffer;
+	private List<VertexBuffer> vertexBuffers;
+
+	public VertexArray(ElementBuffer elementBuffer) {
+		this.id = GL30.glGenVertexArrays();
+		this.elementBuffer = elementBuffer;
+		this.vertexBuffers = new ArrayList<VertexBuffer>();
+		Bind();
+		BindElementArrayBuffer();
+		Unbind();
+	}
+
+	public void Destroy() {
+		GL30.glDeleteBuffers(this.id);
+	}
+
+	public int GetVertexCount() {
+		return this.elementBuffer.GetIndiciesCount();
+	}
+
+	public void BindVertexBuffer(VertexBuffer buffer) {
+		buffer.Bind();
+		buffer.BindVertexAttribs();
+		this.vertexBuffers.add(buffer);
+	}
+
+	public void Bind() {
+		GL30.glBindVertexArray(this.id);
+	}
+
+	public void Unbind() {
+		GL30.glBindVertexArray(0);
+	}
+
+	private void BindElementArrayBuffer() {
+		this.elementBuffer.Bind();
+	}
+}

app/src/main/java/chess/render/VertexAttribPointer.java

@@ -0,0 +1,13 @@
+package chess.render;
+
+public class VertexAttribPointer {
+	public int index;
+	public int size;
+	public int offset;
+
+	public VertexAttribPointer(int index, int size, int offset) {
+		this.index = index;
+		this.size = size;
+		this.offset = offset;
+	}
+}

app/src/main/java/chess/render/VertexBuffer.java

@@ -0,0 +1,50 @@
+package chess.render;
+
+import static org.lwjgl.opengl.GL11.GL_FLOAT;
+
+import java.nio.FloatBuffer;
+import java.util.ArrayList;
+import java.util.List;
+
+import org.lwjgl.opengl.GL30;
+
+public class VertexBuffer {
+	private int id;
+	private int dataStride;
+	List<VertexAttribPointer> vertexAttribs;
+
+	public VertexBuffer(float[] data, int stride) {
+		this.id = GL30.glGenBuffers();
+		this.dataStride = stride;
+		this.vertexAttribs = new ArrayList<VertexAttribPointer>();
+		Bind();
+		GL30.glBufferData(GL30.GL_ARRAY_BUFFER, data.length * 4, GL30.GL_STATIC_DRAW);
+		GL30.glBufferSubData(GL30.GL_ARRAY_BUFFER, 0, data);
+		Unbind();
+	}
+
+	public void Destroy() {
+		GL30.glDeleteBuffers(id);
+	}
+
+	public void Bind() {
+		GL30.glBindBuffer(GL30.GL_ARRAY_BUFFER, this.id);
+	}
+
+	public void Unbind() {
+		GL30.glBindBuffer(GL30.GL_ARRAY_BUFFER, 0);
+	}
+
+	public void AddVertexAttribPointer(int index, int coordinateSize, int offset) {
+		VertexAttribPointer pointer = new VertexAttribPointer(index, coordinateSize, offset);
+		this.vertexAttribs.add(pointer);
+	}
+
+	public void BindVertexAttribs() {
+		for (VertexAttribPointer vertexAttribPointer : vertexAttribs) {
+			GL30.glEnableVertexAttribArray(vertexAttribPointer.index);
+			GL30.glVertexAttribPointer(vertexAttribPointer.index, vertexAttribPointer.size, GL_FLOAT, false,
+					this.dataStride * 4, vertexAttribPointer.offset);
+		}
+	}
+}

app/src/main/java/chess/render/Window.java

@@ -0,0 +1,138 @@
+package chess.render;
+
+import org.lwjgl.*;
+import org.lwjgl.glfw.*;
+import org.lwjgl.opengl.*;
+import org.lwjgl.system.*;
+
+import chess.render.Camera;
+import chess.render.Renderer;
+
+import java.nio.*;
+
+import static org.lwjgl.glfw.Callbacks.*;
+import static org.lwjgl.glfw.GLFW.*;
+import static org.lwjgl.opengl.GL11.*;
+import static org.lwjgl.system.MemoryStack.*;
+import static org.lwjgl.system.MemoryUtil.*;
+
+public class Window {
+
+	// The window handle
+	private long window;
+
+	private Renderer renderer;
+	private Camera cam;
+
+	public Window() {
+		this.renderer = new Renderer();
+		this.cam = new Camera();
+	}
+
+	public void run() {
+		System.out.println("LWJGL " + Version.getVersion() + "!");
+
+		init();
+		loop();
+
+		// Free the window callbacks and destroy the window
+		glfwFreeCallbacks(window);
+		glfwDestroyWindow(window);
+
+		// Terminate GLFW and free the error callback
+		glfwTerminate();
+		glfwSetErrorCallback(null).free();
+	}
+
+	private void init() {
+		// Setup an error callback. The default implementation
+		// will print the error message in System.err.
+		GLFWErrorCallback.createPrint(System.err).set();
+
+		// Initialize GLFW. Most GLFW functions will not work before doing this.
+		if (!glfwInit())
+			throw new IllegalStateException("Unable to initialize GLFW");
+
+		// Configure GLFW
+		glfwDefaultWindowHints(); // optional, the current window hints are already the default
+		glfwWindowHint(GLFW_VISIBLE, GLFW_FALSE); // the window will stay hidden after creation
+		glfwWindowHint(GLFW_RESIZABLE, GLFW_TRUE); // the window will be resizable
+
+		// Create the window
+		window = glfwCreateWindow(1000, 1000, "Chess4J", NULL, NULL);
+		if (window == NULL)
+			throw new RuntimeException("Failed to create the GLFW window");
+
+		// Get the thread stack and push a new frame
+		try (MemoryStack stack = stackPush()) {
+			IntBuffer pWidth = stack.mallocInt(1); // int*
+			IntBuffer pHeight = stack.mallocInt(1); // int*
+
+			// Get the window size passed to glfwCreateWindow
+			glfwGetWindowSize(window, pWidth, pHeight);
+
+			// Get the resolution of the primary monitor
+			GLFWVidMode vidmode = glfwGetVideoMode(glfwGetPrimaryMonitor());
+
+			// Center the window
+			glfwSetWindowPos(
+					window,
+					(vidmode.width() - pWidth.get(0)) / 2,
+					(vidmode.height() - pHeight.get(0)) / 2);
+		} // the stack frame is popped automatically
+
+		// Make the OpenGL context current
+		glfwMakeContextCurrent(window);
+		// Enable v-sync
+		glfwSwapInterval(1);
+
+		// Make the window visible
+		glfwShowWindow(window);
+	}
+
+	private void render() {
+		cam.rotate(0.01f, 0.01f);
+		renderer.Render(cam);
+	}
+
+	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(0.0f, 0.0f, 0.0f, 0.0f);
+
+		glColor4f(1.0f, 0.0f, 0.0f, 1.0f);
+
+		// 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
+
+			render();
+
+			glfwSwapBuffers(window); // swap the color buffers
+
+			// Poll for window events. The key callback above will only be
+			// invoked during this call.
+			glfwPollEvents();
+
+			try (MemoryStack stack = stackPush()) {
+				IntBuffer pWidth = stack.mallocInt(1); // int*
+				IntBuffer pHeight = stack.mallocInt(1); // int*
+
+				// Get the window size passed to glfwCreateWindow
+				glfwGetWindowSize(window, pWidth, pHeight);
+
+				glViewport(0, 0, pWidth.get(), pHeight.get());
+			} // the stack frame is popped automatically
+		}
+	}
+
+}

app/src/main/java/chess/render/shader/BoardShader.java

@@ -0,0 +1,53 @@
+package chess.render.shader;
+
+import org.joml.Matrix4f;
+
+public class BoardShader extends ShaderProgram {
+
+	private static String vertexShader = """
+			#version 330
+
+			layout(location = 0) in vec3 position;
+			layout(location = 1) in vec3 color;
+
+			uniform mat4 camMatrix;
+
+			out vec3 pass_color;
+
+			void main(void){
+				gl_Position = camMatrix * vec4(position, 1.0);
+				pass_color = color;
+			}
+				""";
+
+	private static String fragmentShader = """
+			#version 330
+
+			in vec3 pass_color;
+
+			out vec4 out_color;
+
+			void main(void){
+				out_color = vec4(pass_color, 1.0);
+			}
+				""";
+
+	private int location_CamMatrix = 0;
+
+	public BoardShader() {
+
+	}
+
+	public void LoadShader() {
+		super.LoadProgram(vertexShader, fragmentShader);
+	}
+
+	@Override
+	protected void GetAllUniformLocation() {
+		location_CamMatrix = GetUniformLocation("camMatrix");
+	}
+
+	public void SetCamMatrix(Matrix4f mat) {
+		LoadMat4(location_CamMatrix, mat);
+	}
+}

app/src/main/java/chess/render/shader/ShaderProgram.java

@@ -0,0 +1,94 @@
+package chess.render.shader;
+
+import java.nio.FloatBuffer;
+import java.nio.IntBuffer;
+
+import org.joml.Matrix4f;
+import org.joml.Vector3f;
+import org.lwjgl.BufferUtils;
+import org.lwjgl.opengl.GL30;
+import org.lwjgl.system.MemoryStack;
+
+public abstract class ShaderProgram {
+	private int programId;
+	private int vertexShaderId;
+	private int fragmentShaderId;
+
+	public ShaderProgram() {
+		this.programId = 0;
+		this.vertexShaderId = 0;
+		this.fragmentShaderId = 0;
+	}
+
+	public void Start() {
+		GL30.glUseProgram(this.programId);
+	}
+
+	public void Stop() {
+		GL30.glUseProgram(0);
+	}
+
+	public void LoadProgram(String vertexSource, String fragmentSource) {
+		this.vertexShaderId = LoadShader(vertexSource, GL30.GL_VERTEX_SHADER);
+		this.fragmentShaderId = LoadShader(fragmentSource, GL30.GL_FRAGMENT_SHADER);
+
+		this.programId = GL30.glCreateProgram();
+		GL30.glAttachShader(this.programId, vertexShaderId);
+		GL30.glAttachShader(this.programId, this.fragmentShaderId);
+		GL30.glLinkProgram(this.programId);
+		GL30.glValidateProgram(this.programId);
+
+		if (GL30.glGetProgrami(programId, GL30.GL_VALIDATE_STATUS) == 0) {
+			System.err.println("Warning validating Shader code: " + GL30.glGetProgramInfoLog(programId, 1024));
+		}
+
+		GetAllUniformLocation();
+	}
+
+	private int LoadShader(String source, int type) {
+		int shaderId = GL30.glCreateShader(type);
+
+		GL30.glShaderSource(shaderId, source);
+		GL30.glCompileShader(shaderId);
+
+		IntBuffer compileSuccesful = BufferUtils.createIntBuffer(1);
+		GL30.glGetShaderiv(shaderId, GL30.GL_COMPILE_STATUS, compileSuccesful);
+
+		if (compileSuccesful.get() != 1) {
+			System.out.println("Shader did not compile !");
+			return -1;
+
+		}
+
+		return shaderId;
+	}
+
+	protected abstract void GetAllUniformLocation();
+
+	protected int GetUniformLocation(String uniformName) {
+		int location = GL30.glGetUniformLocation(programId, uniformName);
+		if (location == -1) {
+			System.out.println("Uniform value not found !");
+		}
+		return location;
+	}
+
+	public void LoadFloat(int location, float value) {
+		GL30.glUniform1f(location, value);
+	}
+
+	public void LoadInt(int location, int value) {
+		GL30.glUniform1i(location, value);
+	}
+
+	public void LoadVector(int location, Vector3f vector) {
+		GL30.glUniform3f(location, vector.x, vector.y, vector.z);
+	}
+
+	public void LoadMat4(int location, Matrix4f mat) {
+		try (MemoryStack stack = MemoryStack.stackPush()) {
+			FloatBuffer buffer = mat.get(stack.mallocFloat(16));
+			GL30.glUniformMatrix4fv(location, false, buffer);
+		}
+	}
+}