不支持LWJGL错误"功能" for GL11.glMatrixMode()

时间:2014-08-25 14:25:07

标签: java lwjgl

我会首先发布代码,然后是下面的问题:

import java.util.Properties;

import org.lwjgl.Sys;
import org.lwjgl.input.Keyboard;
import org.lwjgl.input.Mouse;
import org.lwjgl.opengl.ContextAttribs;
import org.lwjgl.opengl.Display;
import org.lwjgl.opengl.DisplayMode;
import org.lwjgl.opengl.GL11;
import org.lwjgl.opengl.PixelFormat;

import ref.Reference;
import ref.Settings;

public class Main implements Runnable {

private static int width;
private static int height;

private long lastframe;
private int fps;
private long lastfps;

private float rotation = 0;
private float x = 400;
private float y = 300;

private boolean running = false;
private Thread thread;
private static Properties settings = new Properties();

public static void main(String[] args) {
    Main game = new Main();
    Settings.load();
    settings = Settings.getSettings();  
    game.initDisplay(); 
    game.initGL();  
    game.start();
}

public void run() { 
    System.out.println("Start");    
    getDelta();
    lastfps = getTime();    
    while (!Display.isCloseRequested()) {           
        if (running) {
            int delta = getDelta();             
            tick(delta);                
            Display.sync(60);
        }           
        render();           
        updateFPS();            
        Display.update();
    }   
    if (Display.isCloseRequested()) {
        stop();
        cleanup();
    }
}

private void updateFPS() {
    if (getTime() - lastfps > 1000) {
        System.out.println("FPS: " + fps);
        fps = 0;
        lastfps += 1000;
    }
    fps++;
}

private void tick(int delta) {
    System.out.println("Tick"); 
    rotation += 0.15f * delta;  
    if (Keyboard.isKeyDown(Keyboard.KEY_LEFT)) x -= 0.35f * delta;
    if (Keyboard.isKeyDown(Keyboard.KEY_RIGHT)) x += 0.35f * delta;
    if (Keyboard.isKeyDown(Keyboard.KEY_UP)) y -= 0.35f * delta;
    if (Keyboard.isKeyDown(Keyboard.KEY_DOWN)) y += 0.35f * delta;
    if (x < 0) x = 0;
    if (x > 800) x = 800;
    if (y < 0) y = 0;
    if (y > 600) y = 600;       
}

private void render() {
    System.out.println("Render");
    GL11.glClear(GL11.GL_COLOR_BUFFER_BIT | GL11.GL_DEPTH_BUFFER_BIT);
    GL11.glColor3f(0.5f, 0.5f, 1.0f);
    GL11.glPushMatrix();
    GL11.glTranslatef(x, y, 0);
    GL11.glRotatef(rotation, 0f, 0f, 0f);
    GL11.glBegin(GL11.GL_QUADS);
    GL11.glVertex2f(x - 50, y - 50);
    GL11.glVertex2f(x + 50, y - 50);
    GL11.glVertex2f(x + 50, y + 50);
    GL11.glVertex2f(x - 50, y + 50);
    GL11.glEnd();
    GL11.glPopMatrix();
}

private void cleanup() {
    Mouse.destroy();
    Keyboard.destroy();
    Display.destroy();
}

public void initGL() {  
    System.out.println("initGL");
    GL11.glClearColor(1.0f, 1.0f, 1.0f, 1.0f);  
    GL11.glMatrixMode(GL11.GL_PROJECTION);
    GL11.glLoadIdentity();
    GL11.glOrtho(0, 800, 0, 600, 1, -1);
    GL11.glMatrixMode(GL11.GL_MODELVIEW);
}

public void initDisplay() {
    System.out.println("initDisplay");

    try {
        width = Integer.parseInt(settings.getProperty("width"));
        height = Integer.parseInt(settings.getProperty("height"));      
        Display.setDisplayMode(new DisplayMode(width, height));
        Display.setTitle(Reference.WINDOWTITLE);
        Display.create();
        Keyboard.create();
        Mouse.create();
    } catch (Exception e) {

    }
}

public void start() {
    if (running) return;
    running = true;
    thread = new Thread(this, "Display");
    thread.start();
}

public void stop() {
    if (!running) return;
    running = false;
    try {
        thread.join();
    } catch (Exception e) {

    }
}

private long getTime() {
    return (Sys.getTime() * 1000) / Sys.getTimerResolution();
}

public int getDelta() {
    long time = getTime();
    int delta = (int) (time - lastframe);
    lastframe = time;   
    return delta;
}

}

现在开始时我得到了错误:

initDisplay
initGL
Exception in thread "main" java.lang.IllegalStateException: Function is not supported
    at org.lwjgl.BufferChecks.checkFunctionAddress(BufferChecks.java:58)
    at org.lwjgl.opengl.GL11.glMatrixMode(GL11.java:2075)
    at Main.initGL(Main.java:127)
    at Main.main(Main.java:41)

这基本上是来自LWJGL Wiki的代码,我只是复制它以查看该线程是否有效并遇到了这个问题。这对我来说是个新事物,所以任何人都可以提供帮助并告诉我什么是不正确的?因为我没理解。

第127行是initGL()的第一行(为此我删除了空行,所以它不再是127,但那是发生错误的行):

GL11.glMatrixMode(GL11.GL_PROJECTION);

没有线程btw正常工作

2 个答案:

答案 0 :(得分:0)

OpenGL调用(来自一个GL上下文)只能在一个线程上运行。您的代码通过两个不同的线程在相同的GL上下文中运行OpenGL代码。在默认线程上运行game.initDisplay()game.initGL(),并在您自己的新线程上运行剩余的OpenGL代码。您需要确保所有OpenGL调用都来自一个线程,或者查看上下文共享。我会选择一个单独的线程,直到证明是一个问题。

答案 1 :(得分:0)

该错误基本上意味着对于此版本的OpenGL,不支持该功能。您要么使用旧版本的OpenGL,要么使用不支持它的较新版本。要设置版本,而不是Display.create(),请执行Display.create(new PixelFormat(),new ContextAttributes(3,0)),这将把您的OpenGL版本设置为3.0,这是一个支持glMatrixMode的版本。