Dither.h revision 2dc236b2bae13b9a0ed9b3f7320502aecd7983b3
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#ifndef ANDROID_HWUI_DITHER_H
18#define ANDROID_HWUI_DITHER_H
19
20#include <GLES3/gl3.h>
21
22namespace android {
23namespace uirenderer {
24
25class Caches;
26class Program;
27
28// Must be a power of two
29#define DITHER_KERNEL_SIZE 4
30// These must not use the .0f notation as they are used from GLSL
31#define DITHER_KERNEL_SIZE_INV (1.0 / 4.0)
32#define DITHER_KERNEL_SIZE_INV_SQUARE (1.0 / 16.0)
33
34/**
35 * Handles dithering for programs.
36 */
37class Dither {
38public:
39    Dither();
40
41    void clear();
42    void setupProgram(Program* program, GLuint* textureUnit);
43
44private:
45    void bindDitherTexture();
46
47    Caches* mCaches;
48    bool mInitialized;
49    GLuint mDitherTexture;
50};
51
52}; // namespace uirenderer
53}; // namespace android
54
55#endif // ANDROID_HWUI_DITHER_H
56