kis_opengl_shader_loader.h

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/*
 * SPDX-FileCopyrightText: 2016 Julian Thijssen <julianthijssen@gmail.com>
 *
 *  SPDX-License-Identifier: GPL-2.0-or-later
 */
 
#include "canvas/kis_display_filter.h"
 
#include <QOpenGLShaderProgram>
#include <QByteArray>
#include <QString>
 
#include <unordered_map>
#include <string>
#include <stdexcept>
 
#include <map>
 
enum Uniform { ModelViewProjection, TextureMatrix, ViewportScale,
               TexelSize, Texture0, Texture1, FixedLodLevel, FragmentColor };
 
class KisShaderProgram : public QOpenGLShaderProgram {
public:
    static std::map<Uniform, const char *> names;
 
    int location(Uniform uniform) {
        std::map<Uniform, int>::const_iterator it = locationMap.find(uniform);
        if (it != locationMap.end()) {
            return it->second;
        } else {
            int location = uniformLocation(names[uniform]);
            locationMap[uniform] = location;
            return location;
        }
    }
private:
    std::map<Uniform, int> locationMap;
};
 
class ShaderLoaderException : public std::runtime_error {
public:
    ShaderLoaderException(QString error) : std::runtime_error(error.toStdString()) { }
};
 
class KisOpenGLShaderLoader {
public:
    KisShaderProgram *loadDisplayShader(QSharedPointer<KisDisplayFilter> displayFilter, bool useHiQualityFiltering);
    KisShaderProgram *loadCheckerShader();
    KisShaderProgram *loadSolidColorShader();
 
private:
    KisShaderProgram *loadShader(QString vertPath, QString fragPath, QByteArray vertHeader, QByteArray fragHeader);
};