Revision control
++ // Copyright (C) 2008-2012 NVIDIA Corporation.
++ // Copyright (C) 2022 The Qt Company Ltd.
++ // SPDX-License-Identifier: LicenseRef-Qt-Commercial OR GPL-3.0-only
++ // Qt-Security score:significant reason:default
++
++
++ #ifndef QSSGCPUTONEMAPPER_P_H
++ #define QSSGCPUTONEMAPPER_P_H
++
++ //
++ // W A R N I N G
++ // -------------
++ //
++ // This file is not part of the Qt API. It exists purely as an
++ // implementation detail. This header file may change from version to
++ // version without notice, or even be removed.
++ //
++ // We mean it.
++ //
++
++ #include <QtGui/qvector3d.h>
++
++ QT_BEGIN_NAMESPACE
++
++ namespace QSSGTonemapper {
++
++ inline QVector3D vsqrt(const QVector3D &a)
++ {
++ return QVector3D(std::sqrt(a.x()), std::sqrt(a.y()), std::sqrt(a.z()));
++ }
++
++ inline QVector3D vmax(const QVector3D &a, const QVector3D &b)
++ {
++ return QVector3D(std::max(a.x(), b.x()), std::max(a.y(), b.y()), std::max(a.z(), b.z()));
++ }
++
++ inline QVector3D vclamp(const QVector3D &a, float b, float c)
++ {
++ return QVector3D(qBound(b, a.x(), c), qBound(b, a.y(), c), qBound(b, a.z(), c));
++ }
++
++ inline QVector3D vadd(const QVector3D &a, float b)
++ {
++ return QVector3D(a.x() + b, a.y() + b, a.z() + b);
++ }
++
++ template<typename mType>
++ inline QVector3D mad(mType m, const QVector3D &a, float b)
++ {
++ return vadd(m * a, b);
++ }
++
++ // all the implementation here is expected to match tonemapper.glsllib
++
++ inline QVector3D tonemapLinearToSrgb(const QVector3D &c)
++ {
++ const QVector3D S1 = vsqrt(c);
++ const QVector3D S2 = vsqrt(S1);
++ const QVector3D S3 = vsqrt(S2);
++ return 0.58512238f * S1 + 0.78314035f * S2 - 0.36826273f * S3;
++ }
++
++ inline QVector3D tonemapHejlDawson(const QVector3D &c)
++ {
++ const QVector3D cc = vmax(QVector3D(0.0f, 0.0f, 0.0f), vadd(c, -0.004f));
++ return (cc * mad(6.2f, cc, 0.5f)) / vadd(cc * mad(6.2f, cc, 1.7f), 0.06f);
++ }
++
++ inline QVector3D tonemapAces(const QVector3D &c)
++ {
++ const float A = 2.51f;
++ const float B = 0.03f;
++ const float C = 2.43f;
++ const float D = 0.59f;
++ const float E = 0.14f;
++ return tonemapLinearToSrgb(vclamp((c * mad(A, c, B)) / vadd(c * mad(C, c, D), E), 0.0f, 1.0f));
++ }
++
++ inline QVector3D tonemapFilmicSub(const QVector3D &c)
++ {
++ const float A = 0.15f;
++ const float B = 0.50f;
++ const float C = 0.10f;
++ const float D = 0.20f;
++ const float E = 0.02f;
++ const float F = 0.30f;
++ return vadd(vadd(c * mad(A, c, C * B), D * E) / vadd(c * mad(A, c, B), D * F), -E / F);
++ }
++
++ inline QVector3D tonemapFilmic(const QVector3D &c)
++ {
++ static const QVector3D whiteScale = QVector3D(1.0f, 1.0f, 1.0f) / tonemapFilmicSub(QVector3D(11.2f, 11.2f, 11.2f));
++ return tonemapLinearToSrgb(tonemapFilmicSub(c * 2.0f) * whiteScale);
++ }
++
++ } // namespace QSSGTonemapper
++
++ QT_END_NAMESPACE
++
++ #endif