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 22 namespace android { 23 namespace uirenderer { 24 25 class Caches; 26 class Extensions; 27 class Program; 28 29 // Must be a power of two 30 #define DITHER_KERNEL_SIZE 4 31 // These must not use the .0f notation as they are used from GLSL 32 #define DITHER_KERNEL_SIZE_INV (1.0 / 4.0) 33 #define DITHER_KERNEL_SIZE_INV_SQUARE (1.0 / 16.0) 34 35 /** 36 * Handles dithering for programs. 37 */ 38 class Dither { 39 public: 40 Dither(Caches& caches); 41 42 void clear(); 43 void setupProgram(Program& program, GLuint* textureUnit); 44 45 private: 46 void bindDitherTexture(); 47 48 Caches& mCaches; 49 bool mInitialized; 50 GLuint mDitherTexture; 51 }; 52 53 }; // namespace uirenderer 54 }; // namespace android 55 56 #endif // ANDROID_HWUI_DITHER_H 57