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
17package com.android.gallery3d.glrenderer;
18
19// ExtTexture is a texture whose content comes from a external texture.
20// Before drawing, setSize() should be called.
21public class ExtTexture extends BasicTexture {
22
23    private int mTarget;
24
25    public ExtTexture(GLCanvas canvas, int target) {
26        GLId glId = canvas.getGLId();
27        mId = glId.generateTexture();
28        mTarget = target;
29    }
30
31    private void uploadToCanvas(GLCanvas canvas) {
32        canvas.setTextureParameters(this);
33        setAssociatedCanvas(canvas);
34        mState = STATE_LOADED;
35    }
36
37    @Override
38    protected boolean onBind(GLCanvas canvas) {
39        if (!isLoaded()) {
40            uploadToCanvas(canvas);
41        }
42
43        return true;
44    }
45
46    @Override
47    public int getTarget() {
48        return mTarget;
49    }
50
51    @Override
52    public boolean isOpaque() {
53        return true;
54    }
55
56    @Override
57    public void yield() {
58        // we cannot free the texture because we have no backup.
59    }
60}
61