1 /*
2  * Copyright (C) 2012 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.android.gallery3d.glrenderer;
18 
19 // ExtTexture is a texture whose content comes from a external texture.
20 // Before drawing, setSize() should be called.
21 public class ExtTexture extends BasicTexture {
22 
23     private int mTarget;
24 
ExtTexture(GLCanvas canvas, int target)25     public ExtTexture(GLCanvas canvas, int target) {
26         GLId glId = canvas.getGLId();
27         mId = glId.generateTexture();
28         mTarget = target;
29     }
30 
uploadToCanvas(GLCanvas canvas)31     private void uploadToCanvas(GLCanvas canvas) {
32         canvas.setTextureParameters(this);
33         setAssociatedCanvas(canvas);
34         mState = STATE_LOADED;
35     }
36 
37     @Override
onBind(GLCanvas canvas)38     protected boolean onBind(GLCanvas canvas) {
39         if (!isLoaded()) {
40             uploadToCanvas(canvas);
41         }
42 
43         return true;
44     }
45 
46     @Override
getTarget()47     public int getTarget() {
48         return mTarget;
49     }
50 
51     @Override
isOpaque()52     public boolean isOpaque() {
53         return true;
54     }
55 
56     @Override
yield()57     public void yield() {
58         // we cannot free the texture because we have no backup.
59     }
60 }
61