我正在研究GL2，有一个函数（来自学校）加载纹理：
bookTex = loadTexture(gl, "wattBook.jpg");
private Texture loadTexture(GL2 gl, String filename) {
Texture tex = null;
try {
File f = new File(filename);
BufferedImage img = ImageIO.read(f); // read file into BufferedImage
ImageUtil.flipImageVertically(img);
tex = AWTTextureIO.newTexture(GLProfile.getDefault(), img, false);
// Different filter settings can be used to give different effects when the texture
tex.setTexParameteri(gl, GL2.GL_TEXTURE_MAG_FILTER, GL2.GL_LINEAR);
tex.setTexParameteri(gl, GL2.GL_TEXTURE_MIN_FILTER, GL2.GL_LINEAR);
}
catch(Exception e) {
System.out.println("Error loading texture " + filename);
}
return tex;
}
然而，它总是抛出异常:(它有太多错误行，所以我只是复制前面行）
*Error loading texture wattBook.jpg
Exception in thread "main-FPSAWTAnimator#00-Timer0" com.jogamp.opengl.util.AnimatorBase$UncaughtAnimatorException: java.lang.RuntimeException: com.jogamp.opengl.GLException: Caught NullPointerException: null on thread AWT-EventQueue-0
at com.jogamp.opengl.util.AWTAnimatorImpl.display(AWTAnimatorImpl.java:92)
at com.jogamp.opengl.util.AnimatorBase.display(AnimatorBase.java:452)
at com.jogamp.opengl.util.FPSAnimator$MainTask.run(FPSAnimator.java:178)
at java.util.TimerThread.mainLoop(Timer.java:555)
at java.util.TimerThread.run(Timer.java:505)
Caused by: java.lang.RuntimeException: com.jogamp.opengl.GLException: Caught NullPointerException: null on thread AWT-EventQueue-0
at com.jogamp.common.util.awt.AWTEDTExecutor.invoke(AWTEDTExecutor.java:58)
at jogamp.opengl.awt.AWTThreadingPlugin.invokeOnOpenGLThread(AWTThreadingPlugin.java:103)
at jogamp.opengl.ThreadingImpl.invokeOnOpenGLThread(ThreadingImpl.java:201)
at com.jogamp.opengl.Threading.invokeOnOpenGLThread(Threading.java:202)
at com.jogamp.opengl.Threading.invoke(Threading.java:221)
at com.jogamp.opengl.awt.GLCanvas.display(GLCanvas.java:505)
at com.jogamp.opengl.util.AWTAnimatorImpl.display(AWTAnimatorImpl.java:81)
... 4 more*
我在Mac上的Eclipse上运行它，并且已经设置了GL环境。有人可以解释这个错误以及如何解决它？谢谢！