shaderfeatures.cpp

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// Copyright (C) 2022 The Qt Company Ltd.

// SPDX-License-Identifier: LicenseRef-Qt-Commercial OR GPL-3.0-only

// Qt-Security score:critical reason:data-parser

#include "shaderfeatures.h"

#include <QStringList>

#include <QDebug>

ShaderFeatures::ShaderFeatures()

// Browse the shaders and check which features are used in them.

void ShaderFeatures::update(const QString &vs, const QString &fs, const QString &qml)

    QStringList vsList = vs.split("\n");

    QStringList fsList = fs.split("\n");

    QStringList code = vsList + fsList;

    Features newFeatures = {};

    m_gridMeshWidth = 1;

    m_gridMeshHeight = 1;

    for (const auto &line : code)

        checkLine(line, newFeatures);

    // iTime may also be used in QML side, without being used in shaders.

    // In this case enable the time helpers creation.

    if (qml.contains("iTime"))

        newFeatures.setFlag(Time, true);

    if (newFeatures != m_enabledFeatures)

        m_enabledFeatures = newFeatures;

void ShaderFeatures::checkLine(const QString &line, Features &features) {

    if (line.contains("iTime"))

        features.setFlag(Time, true);

    if (line.contains("iFrame"))

        features.setFlag(Frame, true);

    if (line.contains("iResolution"))

        features.setFlag(Resolution, true);

    if (line.contains("iSource"))

        features.setFlag(Source, true);

    if (line.contains("iMouse"))

        features.setFlag(Mouse, true);

    if (line.contains("fragCoord"))

        features.setFlag(FragCoord, true);

    if (line.contains("@mesh")) {

        // Get the mesh size, remove "@mesh"

        QString l = line.trimmed().sliced(5);

        QStringList list = l.split(QLatin1Char(','));

        if (list.size() >= 2) {

            int w = list.at(0).trimmed().toInt();

            int h = list.at(1).trimmed().toInt();

            // Set size to max values

            m_gridMeshWidth = std::max(m_gridMeshWidth, w);

            m_gridMeshHeight = std::max(m_gridMeshHeight, h);

        // If is bigger than default (1, 1), set the feature

        if (m_gridMeshWidth > 1 || m_gridMeshHeight > 1)

            features.setFlag(GridMesh, true);

    if (line.contains("@blursources"))

        features.setFlag(BlurSources, true);