1 /*
2  * Copyright (C) 2007 The Android Open Source Project
3  *
4  * Licensed under the Apache License, Version 2.0 (the "License");
5  * you may not use this file except in compliance with the License.
6  * You may obtain a copy of the License at
7  *
8  *      http://www.apache.org/licenses/LICENSE-2.0
9  *
10  * Unless required by applicable law or agreed to in writing, software
11  * distributed under the License is distributed on an "AS IS" BASIS,
12  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13  * See the License for the specific language governing permissions and
14  * limitations under the License.
15  */
16 
17 package com.example.android.apis.graphics.spritetext;
18 
19 import javax.microedition.khronos.opengles.GL10;
20 
21 class MatrixGrabber {
MatrixGrabber()22     public MatrixGrabber() {
23         mModelView = new float[16];
24         mProjection = new float[16];
25     }
26 
27     /**
28      * Record the current modelView and projection matrix state.
29      * Has the side effect of setting the current matrix state to GL_MODELVIEW
30      * @param gl
31      */
getCurrentState(GL10 gl)32     public void getCurrentState(GL10 gl) {
33         getCurrentProjection(gl);
34         getCurrentModelView(gl);
35     }
36 
37     /**
38      * Record the current modelView matrix state. Has the side effect of
39      * setting the current matrix state to GL_MODELVIEW
40      * @param gl
41      */
getCurrentModelView(GL10 gl)42     public void getCurrentModelView(GL10 gl) {
43         getMatrix(gl, GL10.GL_MODELVIEW, mModelView);
44     }
45 
46     /**
47      * Record the current projection matrix state. Has the side effect of
48      * setting the current matrix state to GL_PROJECTION
49      * @param gl
50      */
getCurrentProjection(GL10 gl)51     public void getCurrentProjection(GL10 gl) {
52         getMatrix(gl, GL10.GL_PROJECTION, mProjection);
53     }
54 
getMatrix(GL10 gl, int mode, float[] mat)55     private void getMatrix(GL10 gl, int mode, float[] mat) {
56         MatrixTrackingGL gl2 = (MatrixTrackingGL) gl;
57         gl2.glMatrixMode(mode);
58         gl2.getMatrix(mat, 0);
59     }
60 
61     public float[] mModelView;
62     public float[] mProjection;
63 }
64