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 #include "Program.h" 23 24 namespace android { 25 namespace uirenderer { 26 27 /////////////////////////////////////////////////////////////////////////////// 28 // Defines 29 /////////////////////////////////////////////////////////////////////////////// 30 31 // Must be a power of two 32 #define DITHER_KERNEL_SIZE 4 33 // These must not use the .0f notation as they are used from GLSL 34 #define DITHER_KERNEL_SIZE_INV (1.0 / 4.0) 35 #define DITHER_KERNEL_SIZE_INV_SQUARE (1.0 / 16.0) 36 37 /** 38 * Handles dithering for programs. 39 */ 40 class Dither { 41 public: 42 Dither(): mInitialized(false), mDitherTexture(0) { } 43 44 void clear(); 45 void setupProgram(Program* program, GLuint* textureUnit); 46 47 private: 48 void bindDitherTexture(); 49 50 bool mInitialized; 51 GLuint mDitherTexture; 52 }; 53 54 }; // namespace uirenderer 55 }; // namespace android 56 57 #endif // ANDROID_HWUI_DITHER_H 58
