There's a function that gets the current matrix in OpenGL.
But there's no such function in OpenGL ES.
So I take a look at the API Demo app bundled with the SDK and found
"MatrixGrabber".java with the getCurrentModelView function.
But... when I try to use it in my project, I got an error at this
line:
public void getCurrentModelView(GL10 gl) {
getMatrix(gl, GL10.GL_MODELVIEW, mModelView);
}
private void getMatrix(GL10 gl, int mode, float[] mat) {
MatrixTrackingGL gl2 = (MatrixTrackingGL) gl; // error at
this line
gl2.glMatrixMode(mode);
gl2.getMatrix(mat, 0);
}
The error log was:
08-02 18:49:07.063: WARN/dalvikvm(1403): threadid=13: thread exiting
with uncaught exception (group=0x4000fe70)
08-02 18:49:07.063: ERROR/AndroidRuntime(1403): Uncaught handler:
thread GLThread exiting due to uncaught exception
08-02 18:49:07.063: ERROR/AndroidRuntime(1403):
java.lang.ClassCastException: android.opengl.GLErrorWrapper
08-02 18:49:07.063: ERROR/AndroidRuntime(1403): at
com.test.app.MatrixGrabber.getMatrix(MatrixGrabber.java:56)
08-02 18:49:07.063: ERROR/AndroidRuntime(1403): at
com.test.app.MatrixGrabber.getCurrentModelView(MatrixGrabber.java:43)
08-02 18:49:07.063: ERROR/AndroidRuntime(1403): at
com.test.app.MyRenderer.onDrawFrame(MyRenderer.java:454)
Here's MyRenderer.java's onDrawFrame() code:
public void onDrawFrame(GL10 gl) {
//Init
gl.glClear(GL10.GL_COLOR_BUFFER_BIT | GL10.GL_DEPTH_BUFFER_BIT);
gl.glMatrixMode(GL10.GL_MODELVIEW);
gl.glLoadIdentity();
mGrabber.getCurrentModelView(gl);
What did I do wrong? This method runs fine in API Demo. It accept the
GL10 object like I did in my project.
Thank you in advance. =)
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