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/*
* Copyright (C) 2012 The Android Open Source Project
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
#ifndef ANDROID_HWUI_DITHER_H
#define ANDROID_HWUI_DITHER_H
#include <GLES3/gl3.h>
namespace android {
namespace uirenderer {
class Caches;
class Extensions;
class Program;
// Must be a power of two
#define DITHER_KERNEL_SIZE 4
// These must not use the .0f notation as they are used from GLSL
#define DITHER_KERNEL_SIZE_INV (1.0 / 4.0)
#define DITHER_KERNEL_SIZE_INV_SQUARE (1.0 / 16.0)
/**
* Handles dithering for programs.
*/
class Dither {
public:
Dither(Caches& caches);
void clear();
void setupProgram(Program& program, GLuint* textureUnit);
private:
void bindDitherTexture();
Caches& mCaches;
bool mInitialized;
GLuint mDitherTexture;
};
}; // namespace uirenderer
}; // namespace android
#endif // ANDROID_HWUI_DITHER_H
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