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project/fm_viewer/fav/ConvolutionShader.h

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+/******************************************************************************
+    QtAV:  Multimedia framework based on Qt and FFmpeg
+    Copyright (C) 2012-2016 Wang Bin <wbsecg1@gmail.com>
+
+*   This file is part of QtAV (from 2016)
+
+    This library is free software; you can redistribute it and/or
+    modify it under the terms of the GNU Lesser General Public
+    License as published by the Free Software Foundation; either
+    version 2.1 of the License, or (at your option) any later version.
+
+    This library is distributed in the hope that it will be useful,
+    but WITHOUT ANY WARRANTY; without even the implied warranty of
+    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+    Lesser General Public License for more details.
+
+    You should have received a copy of the GNU Lesser General Public
+    License along with this library; if not, write to the Free Software
+    Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301  USA
+******************************************************************************/
+#ifndef QTAV_CONVOLUTIONSHADER_H
+#define QTAV_CONVOLUTIONSHADER_H
+#include "VideoShader.h"
+#if !(REMOVE_VIDEO_SHADER)
+namespace FAV {
+class ConvolutionShaderPrivate;
+/*!
+ * \brief The ConvolutionShader class
+ * Uniform u_Kernel is used
+ */
+class Q_AV_EXPORT ConvolutionShader : public VideoShader
+{
+    DPTR_DECLARE_PRIVATE(ConvolutionShader)
+public:
+    ConvolutionShader();
+    /*!
+     * \brief kernelRadius
+     * Default is 1, i.e. 3x3 kernel
+     * kernelSize is (2*kernelRadius()+1)^2
+     * \return
+     */
+    int kernelRadius() const;
+    /// TODO: update shader program if radius is changed. mark dirty program
+    void setKernelRadius(int value);
+    int kernelSize() const;
+protected:
+    virtual const float* kernel() const = 0;
+    const QByteArray& kernelUniformHeader() const; //can be used in your userFragmentShaderHeader();
+    const QByteArray& kernelSample() const; //can be  in your userSample();
+    void setKernelUniformValue(); // can be used in your setUserUniformValues()
+private:
+    /// default implementions
+    const char* userShaderHeader(QOpenGLShader::ShaderType t) const Q_DECL_OVERRIDE;
+    const char* userSample() const Q_DECL_OVERRIDE;
+    bool setUserUniformValues() Q_DECL_OVERRIDE;
+protected:
+    ConvolutionShader(ConvolutionShaderPrivate &d);
+};
+} //namespace FAV
+#endif // QTAV_CONVOLUTIONSHADER_H
+#endif // #if !(REMOVE_VIDEO_SHADER)