Question

我试图弄清楚如何在Raspberry Pi上使用OpenGL而不必启动X11。我发现https://www.raspberrypi.org/forums/viewtopic.php?f=81&t=73489指的是jogamp的NEWT框架http://jogamp.org/jogl/doc/NEWT-Overview.html。有一些示例应用程序，但大多数都非常复杂，我很难将它们提炼下来。

我有另一个JOGL 2.3.2 java应用程序在amd64 linux X windows中运行正常（尚未在Pi上尝试过）。它有像

这样的方法

public void init(GLAutoDrawable drawable) {
    GL2 gl = drawable.getGL().getGL2();

    // Enable VSync
    gl.setSwapInterval(1);
    gl.glShadeModel(GL2.GL_FLAT);
    try {
        attachShaders(gl);
    } catch (Exception e) {
        e.printStackTrace();
    }
}

public void display(GLAutoDrawable drawable) {
    GL2 gl = drawable.getGL().getGL2();
//....
}

public static void main(String[] args) {
    JFrame jf = new JFrame();
    jf.setSize(800,800);
    jf.getContentPane().setLayout(new BorderLayout());
    jf.getContentPane().add(new Pepper(), BorderLayout.CENTER);
    jf.setVisible(true);
}

正如您所看到的，main方法非常标准。它会创建一个JFrame并使用此类扩展GLCanvas填充它。

我想知道我应该编写什么样的main例程来创建一个没有X11的NEWT的GLWindow实例，然后使用我现有的类来display在那个GLWindow上。如果相同的main例程使用和不使用X11，则可以获得奖励。

Answer 1

在amd64上的X11中工作的骨架是

public static void main(String[] argv)
    throws InterruptedException
{
    GLCapabilities caps = new GLCapabilities(GLProfile.get(GLProfile.GL2));
    caps.setBackgroundOpaque(true);
    final GLWindow glWindow = GLWindow.create(caps);

    glWindow.setSize(800,600);
    glWindow.setVisible(true);

    Pepper pepper = new Pepper();

    glWindow.addGLEventListener(pepper);

    Animator animator = new Animator(glWindow);
    animator.start();
}

但是如果没有amd64上的X11，这将无效。

在Raspberry Pi上无头，它失败了

libEGL warning: DRI3: xcb_connect failed
libEGL warning: DRI2: xcb_connect failed
libEGL warning: DRI2: xcb_connect failed
Caught handled GLException: EGLGLXDrawableFactory - Could not initialize shared resources for EGLGraphicsDevice[type .egl, v0.0.0, connection decon, unitID 0, handle 0x0, owner true, NullToolkitLock[obj 0x14096e9]] on thread main-SharedResourceRunner
    [0]: jogamp.opengl.egl.EGLDrawableFactory$SharedResourceImplementation.createSharedResource(EGLDrawableFactory.java:518)
    [1]: jogamp.opengl.SharedResourceRunner.run(SharedResourceRunner.java:353)
    [2]: java.lang.Thread.run(Thread.java:745)
Caused[0] by GLException: Failed to created/initialize EGL display incl. fallback default: native 0x0, error 0x3001/0x3001 on thread main-SharedResourceRunner
    [0]: jogamp.opengl.egl.EGLDisplayUtil.eglGetDisplayAndInitialize(EGLDisplayUtil.java:297)
    [1]: jogamp.opengl.egl.EGLDisplayUtil.access$300(EGLDisplayUtil.java:58)
    [2]: jogamp.opengl.egl.EGLDisplayUtil$1.eglGetAndInitDisplay(EGLDisplayUtil.java:320)
    [3]: com.jogamp.nativewindow.egl.EGLGraphicsDevice.open(EGLGraphicsDevice.java:125)
    [4]: jogamp.opengl.egl.EGLDrawableFactory$SharedResourceImplementation.createEGLSharedResourceImpl(EGLDrawableFactory.java:532)
    [5]: jogamp.opengl.egl.EGLDrawableFactory$SharedResourceImplementation.createSharedResource(EGLDrawableFactory.java:516)
    [6]: jogamp.opengl.SharedResourceRunner.run(SharedResourceRunner.java:353)
    [7]: java.lang.Thread.run(Thread.java:745)
Exception in thread "main" com.jogamp.opengl.GLException: Profile GL2 is not available on null, but: []
        at com.jogamp.opengl.GLProfile.get(GLProfile.java:991)
        at com.jogamp.opengl.GLProfile.get(GLProfile.java:1004)
        at NewtPepper.main(NewtPepper.java:15)

在覆盆子pi的X11下，它失败了

libEGL warning: DRI2: failed to authenticate
Exception in thread "main" java.lang.InternalError: Available GLVersions not set for EGLGraphicsDevice[type .egl, v1.4.0, connection decon, unitID 0, handle 0x63488be8, owner true, NullToolkitLock[obj 0x16eb2ec]]
        at com.jogamp.opengl.GLProfile.initProfilesForDeviceCritical(GLProfile.java:1952)
        at com.jogamp.opengl.GLProfile.initProfilesForDevice(GLProfile.java:1875)
        at com.jogamp.opengl.GLProfile.initProfilesForDefaultDevices(GLProfile.java:1842)
        at com.jogamp.opengl.GLProfile.access$000(GLProfile.java:80)
        at com.jogamp.opengl.GLProfile$1.run(GLProfile.java:230)
        at java.security.AccessController.doPrivileged(Native Method)
        at com.jogamp.opengl.GLProfile.initSingleton(GLProfile.java:216)
        at com.jogamp.opengl.GLProfile.getProfileMap(GLProfile.java:2297)
        at com.jogamp.opengl.GLProfile.get(GLProfile.java:988)
        at com.jogamp.opengl.GLProfile.get(GLProfile.java:1004)
        at NewtPepper.main(NewtPepper.java:15)

在没有X11的情况下运行jogamp的NEWT的基本框架是什么？

1 个答案: