使用回調在LWJGL3中使三角形旋轉

Question

因此，如何按上，下，左或右旋轉三角形。 我有一個鍵盤類，可以讀取鍵並創建事件。 但是我不知道在LWJGL 3中旋轉的功能。我想我熟悉經典的gl.h旋轉方式，但是由於LWJGL 3相當新，因此沒有很多信息。 這是Display類和KeyboardHandler類的代碼。

顯示

public class Driver implements Runnable{

private GLFWKeyCallback keyCallback;
private Thread thread = new Thread();
private boolean running = false;


public long window;

private static final int WIDTH = 600;
private static final int HEIGHT = WIDTH / 12 * 9;

public Driver(){

}

private synchronized void start(){
    thread.start();
    running = true;
}

private synchronized void stop(){
    try {
        thread.join();
        running = false;
    } catch (InterruptedException e) {
        e.printStackTrace();
    }
}

public void run(){
    init();
    while(running){

        render();
        update();

        if(glfwWindowShouldClose(window) == GL_TRUE){
            running = false;
            keyCallback.release();
        }
    }
}

public void init() {

    if(glfwInit() != GL_TRUE){
        System.err.println("Failed to initilaize OpenGL");
    }

    glfwWindowHint(GLFW_RESIZABLE, GL_FALSE);
    window = glfwCreateWindow(WIDTH, HEIGHT, "Endless", NULL, NULL);

    if(window == NULL){
        System.err.println("Could not create window. ");
    }

    glfwSetKeyCallback(window, keyCallback = new KeyboardHandler());

    ByteBuffer vidmode = glfwGetVideoMode(glfwGetPrimaryMonitor());
    glfwSetWindowPos(window, 100, 100);
    glfwMakeContextCurrent(window);
    glfwShowWindow(window);

}


public void update() {
    if(KeyboardHandler.isKeyDown(GLFW_KEY_LEFT)){
        //event who'll start rotation
    }
    glfwPollEvents();
}

public void render() {

    GLContext.createFromCurrent();

    glBegin(GL_TRIANGLES);
    glColor3f(1.0f, 0.0f, 0.0f);
    glVertex2f(-1.0f / 2, -1.0f / 2);
    glColor3f(0.0f, 1.0f, 0.0f);
    glVertex2f(0.0f / 2, 1.0f / 2);
    glColor3f(0.0f, 0.0f, 1.0f);
    glVertex2f(1.0f / 2, -1.0f / 2);
    glEnd();

    //rotation of triangle

    glfwSwapBuffers(window);
}


public static void main(String[] args) {
    Driver game = new Driver();
    game.start();
    game.run();
}

}

和KeyboardHandler

public class KeyboardHandler extends GLFWKeyCallback{

private static boolean keys[] = new boolean[65536];

public void invoke(long window, int key, int scancode, int action, int mods)         
{   
keys[key] = action != GLFW_RELEASE;
}

public static boolean isKeyDown(int keycode){
    return keys[keycode];
}

}

我猜旋轉本身應該在render（）中發生，而觸發旋轉的按鍵回調應該在update（）中發生

Answer 1

隨着LWJGL 3的引入，您必須使用着色器旋轉，縮放和變換對象。 您可以在Internet上找到許多資源來展示如何執行此操作，其中之一就是OpenGL編程WikiBook。 具體來說， 在教程四中 ，它處理了現代OpenGL中的旋轉對象