Java tutorial
/* * To change this license header, choose License Headers in Project Properties. * To change this template file, choose Tools | Templates * and open the template in the editor. */ package java3dv3; import java.nio.ByteBuffer; import org.lwjgl.Sys; import static org.lwjgl.glfw.Callbacks.errorCallbackPrint; import static org.lwjgl.glfw.GLFW.GLFW_KEY_ESCAPE; import static org.lwjgl.glfw.GLFW.GLFW_RELEASE; import static org.lwjgl.glfw.GLFW.GLFW_RESIZABLE; import static org.lwjgl.glfw.GLFW.GLFW_VISIBLE; import static org.lwjgl.glfw.GLFW.glfwCreateWindow; import static org.lwjgl.glfw.GLFW.glfwDefaultWindowHints; import static org.lwjgl.glfw.GLFW.glfwDestroyWindow; import static org.lwjgl.glfw.GLFW.glfwGetPrimaryMonitor; import static org.lwjgl.glfw.GLFW.glfwGetVideoMode; import static org.lwjgl.glfw.GLFW.glfwInit; import static org.lwjgl.glfw.GLFW.glfwMakeContextCurrent; import static org.lwjgl.glfw.GLFW.glfwPollEvents; import static org.lwjgl.glfw.GLFW.glfwSetErrorCallback; import static org.lwjgl.glfw.GLFW.glfwSetKeyCallback; import static org.lwjgl.glfw.GLFW.glfwSetWindowPos; import static org.lwjgl.glfw.GLFW.glfwSetWindowShouldClose; import static org.lwjgl.glfw.GLFW.glfwShowWindow; import static org.lwjgl.glfw.GLFW.glfwSwapBuffers; import static org.lwjgl.glfw.GLFW.glfwSwapInterval; import static org.lwjgl.glfw.GLFW.glfwTerminate; import static org.lwjgl.glfw.GLFW.glfwWindowHint; import static org.lwjgl.glfw.GLFW.glfwWindowShouldClose; import org.lwjgl.glfw.GLFWErrorCallback; import org.lwjgl.glfw.GLFWKeyCallback; import org.lwjgl.glfw.GLFWvidmode; import org.lwjgl.opengl.GL11; import static org.lwjgl.opengl.GL11.GL_COLOR_BUFFER_BIT; import static org.lwjgl.opengl.GL11.GL_DEPTH_BUFFER_BIT; import static org.lwjgl.opengl.GL11.GL_FALSE; import static org.lwjgl.opengl.GL11.GL_PROJECTION; import static org.lwjgl.opengl.GL11.GL_TRIANGLES; import static org.lwjgl.opengl.GL11.GL_TRUE; import static org.lwjgl.opengl.GL11.glBegin; import static org.lwjgl.opengl.GL11.glClear; import static org.lwjgl.opengl.GL11.glClearColor; import static org.lwjgl.opengl.GL11.glColor3f; import static org.lwjgl.opengl.GL11.glEnd; import static org.lwjgl.opengl.GL11.glLoadIdentity; import static org.lwjgl.opengl.GL11.glMatrixMode; import static org.lwjgl.opengl.GL11.glVertex3f; import org.lwjgl.opengl.GLContext; import static org.lwjgl.system.MemoryUtil.NULL; /** * * @author Agustin */ public class Tutorial2 { // We need to strongly reference callback instances. private GLFWErrorCallback errorCallback; private GLFWKeyCallback keyCallback; // The window handle private long window; public void run() { System.out.println("Hello LWJGL " + Sys.getVersion() + "!. Tutorial 1"); try { init(); loop(); // Release window and window callbacks glfwDestroyWindow(window); keyCallback.release(); } finally { // Terminate GLFW and release the GLFWerrorfun glfwTerminate(); errorCallback.release(); } } private void init() { // Setup an error callback. The default implementation // will print the error message in System.err. glfwSetErrorCallback(errorCallback = errorCallbackPrint(System.err)); // Initialize GLFW. Most GLFW functions will not work before doing this. if (glfwInit() != GL11.GL_TRUE) { throw new IllegalStateException("Unable to initialize GLFW"); } // Configure our window glfwDefaultWindowHints(); // optional, the current window hints are already the default glfwWindowHint(GLFW_VISIBLE, GL_FALSE); // the window will stay hidden after creation glfwWindowHint(GLFW_RESIZABLE, GL_TRUE); // the window will be resizable int WIDTH = 500; int HEIGHT = 500; // Create the window window = glfwCreateWindow(WIDTH, HEIGHT, "Tutorial 2", NULL, NULL); if (window == NULL) { throw new RuntimeException("Failed to create the GLFW window"); } // Setup a key callback. It will be called every time a key is pressed, repeated or released. glfwSetKeyCallback(window, keyCallback = new GLFWKeyCallback() { @Override public void invoke(long window, int key, int scancode, int action, int mods) { if (key == GLFW_KEY_ESCAPE && action == GLFW_RELEASE) { glfwSetWindowShouldClose(window, GL_TRUE); // We will detect this in our rendering loop } } }); // Get the resolution of the primary monitor ByteBuffer vidmode = glfwGetVideoMode(glfwGetPrimaryMonitor()); // Center our window glfwSetWindowPos(window, (GLFWvidmode.width(vidmode) - WIDTH) / 2, (GLFWvidmode.height(vidmode) - HEIGHT) / 2); // Make the OpenGL context current glfwMakeContextCurrent(window); // Enable v-sync glfwSwapInterval(1); // Make the window visible glfwShowWindow(window); } 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 ContextCapabilities instance and makes the OpenGL // bindings available for use. GLContext.createFromCurrent(); // Set the clear color glClearColor(1.0f, 1.0f, 1.0f, 0.0f); // Run the rendering loop until the user has attempted to close // the window or has pressed the ESCAPE key. while (glfwWindowShouldClose(window) == GL_FALSE) { glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT); // clear the framebuffer /* Render triangle */ glBegin(GL_TRIANGLES); glColor3f(1f, 0f, 0f); glVertex3f(-0.6f, -0.4f, 0f); glColor3f(0f, 1f, 0f); glVertex3f(0.6f, -0.4f, 0f); glColor3f(0f, 0f, 1f); glVertex3f(0f, 0.6f, 0f); glEnd(); /* Swap buffers and poll Events */ glfwSwapBuffers(window); // swap the color buffers // Poll for window events. The key callback above will only be // invoked during this call. glfwPollEvents(); } } public static void main(String[] args) { new Tutorial2().run(); } }