// Copyright (C) 2014 Klaralvdalens Datakonsult AB (KDAB).
// SPDX-License-Identifier: LicenseRef-Qt-Commercial OR LGPL-3.0-only OR GPL-2.0-only OR GPL-3.0-only

#include "qphongmaterial.h"
#include "qphongmaterial_p.h"

#include <Qt3DRender/qfilterkey.h>
#include <Qt3DRender/qmaterial.h>
#include <Qt3DRender/qeffect.h>
#include <Qt3DRender/qtechnique.h>
#include <Qt3DRender/qshaderprogram.h>
#include <Qt3DRender/qshaderprogrambuilder.h>
#include <Qt3DRender/qparameter.h>
#include <Qt3DRender/qrenderpass.h>
#include <Qt3DRender/qgraphicsapifilter.h>
#include <QtCore/QUrl>
#include <QtGui/QVector3D>
#include <QtGui/QVector4D>


QT_BEGIN_NAMESPACE

namespace Qt3DExtras {

using namespace Qt3DRender;

QPhongMaterialPrivate::QPhongMaterialPrivate()
    : QMaterialPrivate()
    , m_phongEffect(new QEffect())
    , m_ambientParameter(new QParameter(QStringLiteral("ka"), QColor::fromRgbF(0.05f, 0.05f, 0.05f, 1.0f)))
    , m_diffuseParameter(new QParameter(QStringLiteral("kd"), QColor::fromRgbF(0.7f, 0.7f, 0.7f, 1.0f)))
    , m_specularParameter(new QParameter(QStringLiteral("ks"), QColor::fromRgbF(0.01f, 0.01f, 0.01f, 1.0f)))
    , m_shininessParameter(new QParameter(QStringLiteral("shininess"), 150.0f))
    , m_phongGL3Technique(new QTechnique())
    , m_phongGL2Technique(new QTechnique())
    , m_phongES2Technique(new QTechnique())
    , m_phongRHITechnique(new QTechnique())
    , m_phongGL3RenderPass(new QRenderPass())
    , m_phongGL2RenderPass(new QRenderPass())
    , m_phongES2RenderPass(new QRenderPass())
    , m_phongRHIRenderPass(new QRenderPass())
    , m_phongGL3Shader(new QShaderProgram())
    , m_phongGL3ShaderBuilder(new QShaderProgramBuilder())
    , m_phongGL2ES2Shader(new QShaderProgram())
    , m_phongGL2ES2ShaderBuilder(new QShaderProgramBuilder())
    , m_phongRHIShader(new QShaderProgram())
    , m_phongRHIShaderBuilder(new QShaderProgramBuilder())
    , m_filterKey(new QFilterKey)
{
}

void QPhongMaterialPrivate::init()
{
    Q_Q(QPhongMaterial);

    connect(m_ambientParameter, &Qt3DRender::QParameter::valueChanged,
            this, &QPhongMaterialPrivate::handleAmbientChanged);
    connect(m_diffuseParameter, &Qt3DRender::QParameter::valueChanged,
            this, &QPhongMaterialPrivate::handleDiffuseChanged);
    connect(m_specularParameter, &Qt3DRender::QParameter::valueChanged,
            this, &QPhongMaterialPrivate::handleSpecularChanged);
    connect(m_shininessParameter, &Qt3DRender::QParameter::valueChanged,
            this, &QPhongMaterialPrivate::handleShininessChanged);

    m_phongGL3Shader->setVertexShaderCode(QShaderProgram::loadSource(QUrl(QStringLiteral("qrc:/shaders/gl3/default.vert"))));
    m_phongGL3ShaderBuilder->setParent(q);
    m_phongGL3ShaderBuilder->setShaderProgram(m_phongGL3Shader);
    m_phongGL3ShaderBuilder->setFragmentShaderGraph(QUrl(QStringLiteral("qrc:/shaders/graphs/phong.frag.json")));
    m_phongGL3ShaderBuilder->setEnabledLayers({QStringLiteral("diffuse"),
                                               QStringLiteral("specular"),
                                               QStringLiteral("normal")});

    m_phongGL2ES2Shader->setVertexShaderCode(QShaderProgram::loadSource(QUrl(QStringLiteral("qrc:/shaders/es2/default.vert"))));
    m_phongGL2ES2ShaderBuilder->setParent(q);
    m_phongGL2ES2ShaderBuilder->setShaderProgram(m_phongGL2ES2Shader);
    m_phongGL2ES2ShaderBuilder->setFragmentShaderGraph(QUrl(QStringLiteral("qrc:/shaders/graphs/phong.frag.json")));
    m_phongGL2ES2ShaderBuilder->setEnabledLayers({QStringLiteral("diffuse"),
                                                  QStringLiteral("specular"),
                                                  QStringLiteral("normal")});

    m_phongRHIShader->setVertexShaderCode(QShaderProgram::loadSource(QUrl(QStringLiteral("qrc:/shaders/rhi/default_pos_norm.vert"))));
    m_phongRHIShaderBuilder->setParent(q);
    m_phongRHIShaderBuilder->setShaderProgram(m_phongRHIShader);
    m_phongRHIShaderBuilder->setFragmentShaderGraph(QUrl(QStringLiteral("qrc:/shaders/graphs/phong.frag.json")));
    m_phongRHIShaderBuilder->setEnabledLayers({QStringLiteral("diffuse"),
                                               QStringLiteral("specular"),
                                               QStringLiteral("normal")});

    m_phongGL3Technique->graphicsApiFilter()->setApi(QGraphicsApiFilter::OpenGL);
    m_phongGL3Technique->graphicsApiFilter()->setMajorVersion(3);
    m_phongGL3Technique->graphicsApiFilter()->setMinorVersion(1);
    m_phongGL3Technique->graphicsApiFilter()->setProfile(QGraphicsApiFilter::CoreProfile);

    m_phongGL2Technique->graphicsApiFilter()->setApi(QGraphicsApiFilter::OpenGL);
    m_phongGL2Technique->graphicsApiFilter()->setMajorVersion(2);
    m_phongGL2Technique->graphicsApiFilter()->setMinorVersion(0);
    m_phongGL2Technique->graphicsApiFilter()->setProfile(QGraphicsApiFilter::NoProfile);

    m_phongES2Technique->graphicsApiFilter()->setApi(QGraphicsApiFilter::OpenGLES);
    m_phongES2Technique->graphicsApiFilter()->setMajorVersion(2);
    m_phongES2Technique->graphicsApiFilter()->setMinorVersion(0);
    m_phongES2Technique->graphicsApiFilter()->setProfile(QGraphicsApiFilter::NoProfile);

    m_phongRHITechnique->graphicsApiFilter()->setApi(QGraphicsApiFilter::RHI);
    m_phongRHITechnique->graphicsApiFilter()->setMajorVersion(1);
    m_phongRHITechnique->graphicsApiFilter()->setMinorVersion(0);

    m_phongGL3RenderPass->setShaderProgram(m_phongGL3Shader);
    m_phongGL2RenderPass->setShaderProgram(m_phongGL2ES2Shader);
    m_phongES2RenderPass->setShaderProgram(m_phongGL2ES2Shader);
    m_phongRHIRenderPass->setShaderProgram(m_phongRHIShader);

    m_phongGL3Technique->addRenderPass(m_phongGL3RenderPass);
    m_phongGL2Technique->addRenderPass(m_phongGL2RenderPass);
    m_phongES2Technique->addRenderPass(m_phongES2RenderPass);
    m_phongRHITechnique->addRenderPass(m_phongRHIRenderPass);

    m_filterKey->setParent(q);
    m_filterKey->setName(QStringLiteral("renderingStyle"));
    m_filterKey->setValue(QStringLiteral("forward"));

    m_phongGL3Technique->addFilterKey(m_filterKey);
    m_phongGL2Technique->addFilterKey(m_filterKey);
    m_phongES2Technique->addFilterKey(m_filterKey);
    m_phongRHITechnique->addFilterKey(m_filterKey);

    m_phongEffect->addTechnique(m_phongGL3Technique);
    m_phongEffect->addTechnique(m_phongGL2Technique);
    m_phongEffect->addTechnique(m_phongES2Technique);
    m_phongEffect->addTechnique(m_phongRHITechnique);

    m_phongEffect->addParameter(m_ambientParameter);
    m_phongEffect->addParameter(m_diffuseParameter);
    m_phongEffect->addParameter(m_specularParameter);
    m_phongEffect->addParameter(m_shininessParameter);

    q->setEffect(m_phongEffect);
}

void QPhongMaterialPrivate::handleAmbientChanged(const QVariant &var)
{
    Q_Q(QPhongMaterial);
    emit q->ambientChanged(var.value<QColor>());
}

void QPhongMaterialPrivate::handleDiffuseChanged(const QVariant &var)
{
    Q_Q(QPhongMaterial);
    emit q->diffuseChanged(var.value<QColor>());
}

void QPhongMaterialPrivate::handleSpecularChanged(const QVariant &var)
{
    Q_Q(QPhongMaterial);
    emit q->specularChanged(var.value<QColor>());
}

void QPhongMaterialPrivate::handleShininessChanged(const QVariant &var)
{
    Q_Q(QPhongMaterial);
    emit q->shininessChanged(var.toFloat());
}

/*!
    \class Qt3DExtras::QPhongMaterial
    \brief The QPhongMaterial class provides a default implementation of the phong lighting effect.
    \inmodule Qt3DExtras
    \since 5.7
    \inherits Qt3DRender::QMaterial

    \deprecated
    This class is deprecated; use QDiffuseSpecularMaterial instead.

    The phong lighting effect is based on the combination of 3 lighting components ambient, diffuse
    and specular. The relative strengths of these components are controlled by means of their
    reflectivity coefficients which are modelled as RGB triplets:

    \list
    \li Ambient is the color that is emitted by an object without any other light source.
    \li Diffuse is the color that is emitted for rought surface reflections with the lights.
    \li Specular is the color emitted for shiny surface reflections with the lights.
    \li The shininess of a surface is controlled by a float property.
    \endlist

    This material uses an effect with a single render pass approach and performs per fragment
    lighting. Techniques are provided for OpenGL 2, OpenGL 3 or above as well as OpenGL ES 2.
*/

/*!
    Constructs a new QPhongMaterial instance with parent object \a parent.
*/
QPhongMaterial::QPhongMaterial(QNode *parent)
    : QMaterial(*new QPhongMaterialPrivate, parent)
{
    Q_D(QPhongMaterial);
    d->init();
}

/*!
   Destroys the QPhongMaterial.
*/
QPhongMaterial::~QPhongMaterial()
{
}

/*!
    \property Qt3DExtras::QPhongMaterial::ambient

    Holds the ambient color.
*/
QColor QPhongMaterial::ambient() const
{
    Q_D(const QPhongMaterial);
    return d->m_ambientParameter->value().value<QColor>();
}

/*!
    \property Qt3DExtras::QPhongMaterial::diffuse

    Holds the diffuse color.
*/
QColor QPhongMaterial::diffuse() const
{
    Q_D(const QPhongMaterial);
    return d->m_diffuseParameter->value().value<QColor>();
}

/*!
    \property Qt3DExtras::QPhongMaterial::specular

    Holds the specular color.
*/
QColor QPhongMaterial::specular() const
{
    Q_D(const QPhongMaterial);
    return d->m_specularParameter->value().value<QColor>();
}

/*!
    \property Qt3DExtras::QPhongMaterial::shininess

    Holds the shininess exponent.
*/
float QPhongMaterial::shininess() const
{
    Q_D(const QPhongMaterial);
    return d->m_shininessParameter->value().toFloat();
}

void QPhongMaterial::setAmbient(const QColor &ambient)
{
    Q_D(QPhongMaterial);
    d->m_ambientParameter->setValue(ambient);
}

void QPhongMaterial::setDiffuse(const QColor &diffuse)
{
    Q_D(QPhongMaterial);
    d->m_diffuseParameter->setValue(diffuse);
}

void QPhongMaterial::setSpecular(const QColor &specular)
{
    Q_D(QPhongMaterial);
    d->m_specularParameter->setValue(specular);
}

void QPhongMaterial::setShininess(float shininess)
{
    Q_D(QPhongMaterial);
    d->m_shininessParameter->setValue(shininess);
}

} // namespace Qt3DExtras

QT_END_NAMESPACE

#include "moc_qphongmaterial.cpp"