b488004289
Float textures offer better precision for dithering. In addition this change removes two uniforms from gradient shaders. These uniforms were used to dither gradients but their value is a build time constant. Instead we hardcode the value directly in the shader source at compile time. Change-Id: I05e9fd3eef93771843bbd91b453274452dfaefee
58 lines
1.5 KiB
C++
58 lines
1.5 KiB
C++
/*
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* Copyright (C) 2012 The Android Open Source Project
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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#ifndef ANDROID_HWUI_DITHER_H
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#define ANDROID_HWUI_DITHER_H
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#include <GLES3/gl3.h>
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#include "Program.h"
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namespace android {
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namespace uirenderer {
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///////////////////////////////////////////////////////////////////////////////
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// Defines
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///////////////////////////////////////////////////////////////////////////////
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// Must be a power of two
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#define DITHER_KERNEL_SIZE 4
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// These must not use the .0f notation as they are used from GLSL
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#define DITHER_KERNEL_SIZE_INV (1.0 / 4.0)
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#define DITHER_KERNEL_SIZE_INV_SQUARE (1.0 / 16.0)
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/**
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* Handles dithering for programs.
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*/
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class Dither {
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public:
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Dither(): mInitialized(false), mDitherTexture(0) { }
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void clear();
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void setupProgram(Program* program, GLuint* textureUnit);
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private:
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void bindDitherTexture();
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bool mInitialized;
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GLuint mDitherTexture;
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};
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}; // namespace uirenderer
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}; // namespace android
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#endif // ANDROID_HWUI_DITHER_H
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