“在没有当前上下文的情况下调用OpenGL ES API"；

问题描述

每当我取消注释下面的最后一行时，Dalvik LogCat就是这样说的.因此，在此过程中的某个地方根本没有创建当前上下文.为什么?感谢您的帮助.

That's what the Dalvik LogCat is saying whenever I uncomment the last line, below. So somewhere along the way, a current context isn't being created at all. Why? Thanks for any help.

final EGL10 egl = (EGL10) EGLContext.getEGL();
final EGLDisplay eglDisplay = egl.eglGetDisplay(EGL10.EGL_DEFAULT_DISPLAY);
egl.eglInitialize(eglDisplay, version);

int[] configSpec = {
EGL10.EGL_NONE
};

final EGLConfig[] config = new EGLConfig[1];
int num_configs[] = new int[1];
egl.eglChooseConfig(eglDisplay, configSpec, config, 1, num_configs);

final EGLContext eglContext = egl.eglCreateContext(eglDisplay, config[0], EGL10.EGL_NO_CONTEXT, null);
final GL10 gl = (GL10) eglContext.getGL();

int b[] = new int[w * (h)];
IntBuffer ib = IntBuffer.wrap(b);
ib.position(0);
gl.glReadPixels(w, 0, w, h, GL10.GL_RGB,GL10.GL_UNSIGNED_BYTE, ib);

推荐答案

在调用任何OpenGL函数之前，应使用EGL.eglMakeCurrent.这将使上下文在线程中为当前状态.

You should use EGL.eglMakeCurrent before calling any OpenGL functions. This will make the context current in the thread.

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