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#include "qnormaldiffusemapalphamaterial.h"
#include "qnormaldiffusemapalphamaterial_p.h"

#include <Qt3DRender/qeffect.h>
#include <Qt3DRender/qtexture.h>
#include <Qt3DRender/qtechnique.h>
#include <Qt3DRender/qparameter.h>
#include <Qt3DRender/qshaderprogram.h>
#include <Qt3DRender/qrenderpass.h>
#include <Qt3DRender/qgraphicsapifilter.h>
#include <Qt3DRender/qalphacoverage.h>
#include <Qt3DRender/qdepthtest.h>

#include <QUrl>
#include <QVector3D>
#include <QVector4D>

QT_BEGIN_NAMESPACE

using namespace Qt3DRender;

namespace Qt3DExtras {


QNormalDiffuseMapAlphaMaterialPrivate::QNormalDiffuseMapAlphaMaterialPrivate()
    : QNormalDiffuseMapMaterialPrivate()
    , m_alphaCoverage(new QAlphaCoverage())
    , m_depthTest(new QDepthTest())
{
}

void QNormalDiffuseMapAlphaMaterialPrivate::init()
{
    connect(m_ambientParameter, &Qt3DRender::QParameter::valueChanged,
            this, &QNormalDiffuseMapMaterialPrivate::handleAmbientChanged);
    connect(m_diffuseParameter, &Qt3DRender::QParameter::valueChanged,
            this, &QNormalDiffuseMapMaterialPrivate::handleDiffuseChanged);
    connect(m_normalParameter, &Qt3DRender::QParameter::valueChanged,
            this, &QNormalDiffuseMapMaterialPrivate::handleNormalChanged);
    connect(m_specularParameter, &Qt3DRender::QParameter::valueChanged,
            this, &QNormalDiffuseMapMaterialPrivate::handleSpecularChanged);
    connect(m_shininessParameter, &Qt3DRender::QParameter::valueChanged,
            this, &QNormalDiffuseMapMaterialPrivate::handleShininessChanged);
    connect(m_textureScaleParameter, &Qt3DRender::QParameter::valueChanged,
            this, &QNormalDiffuseMapMaterialPrivate::handleTextureScaleChanged);

    m_normalDiffuseGL3Shader->setVertexShaderCode(QShaderProgram::loadSource(QUrl(QStringLiteral("qrc:/shaders/gl3/normaldiffusemap.vert"))));
    m_normalDiffuseGL3Shader->setFragmentShaderCode(QShaderProgram::loadSource(QUrl(QStringLiteral("qrc:/shaders/gl3/normaldiffusemapalpha.frag"))));
    m_normalDiffuseGL2ES2Shader->setVertexShaderCode(QShaderProgram::loadSource(QUrl(QStringLiteral("qrc:/shaders/es2/normaldiffusemap.vert"))));
    m_normalDiffuseGL2ES2Shader->setFragmentShaderCode(QShaderProgram::loadSource(QUrl(QStringLiteral("qrc:/shaders/es2/normaldiffusemapalpha.frag"))));

    m_normalDiffuseGL3Technique->graphicsApiFilter()->setApi(QGraphicsApiFilter::OpenGL);
    m_normalDiffuseGL3Technique->graphicsApiFilter()->setMajorVersion(3);
    m_normalDiffuseGL3Technique->graphicsApiFilter()->setMinorVersion(1);
    m_normalDiffuseGL3Technique->graphicsApiFilter()->setProfile(QGraphicsApiFilter::CoreProfile);

    m_normalDiffuseGL2Technique->graphicsApiFilter()->setApi(QGraphicsApiFilter::OpenGL);
    m_normalDiffuseGL2Technique->graphicsApiFilter()->setMajorVersion(2);
    m_normalDiffuseGL2Technique->graphicsApiFilter()->setMinorVersion(0);
    m_normalDiffuseGL2Technique->graphicsApiFilter()->setProfile(QGraphicsApiFilter::NoProfile);

    m_normalDiffuseES2Technique->graphicsApiFilter()->setApi(QGraphicsApiFilter::OpenGLES);
    m_normalDiffuseES2Technique->graphicsApiFilter()->setMajorVersion(2);
    m_normalDiffuseES2Technique->graphicsApiFilter()->setMinorVersion(0);
    m_normalDiffuseES2Technique->graphicsApiFilter()->setProfile(QGraphicsApiFilter::NoProfile);

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

    m_normalDiffuseGL3Technique->addFilterKey(m_filterKey);
    m_normalDiffuseGL2Technique->addFilterKey(m_filterKey);
    m_normalDiffuseES2Technique->addFilterKey(m_filterKey);

    m_depthTest->setDepthFunction(QDepthTest::Less);

    m_normalDiffuseGL3RenderPass->setShaderProgram(m_normalDiffuseGL3Shader);
    m_normalDiffuseGL3RenderPass->addRenderState(m_alphaCoverage);
    m_normalDiffuseGL3RenderPass->addRenderState(m_depthTest);

    m_normalDiffuseGL2RenderPass->setShaderProgram(m_normalDiffuseGL2ES2Shader);
    m_normalDiffuseGL2RenderPass->addRenderState(m_alphaCoverage);
    m_normalDiffuseGL2RenderPass->addRenderState(m_depthTest);

    m_normalDiffuseES2RenderPass->setShaderProgram(m_normalDiffuseGL2ES2Shader);
    m_normalDiffuseES2RenderPass->addRenderState(m_alphaCoverage);
    m_normalDiffuseES2RenderPass->addRenderState(m_depthTest);

    m_normalDiffuseGL3Technique->addRenderPass(m_normalDiffuseGL3RenderPass);
    m_normalDiffuseGL2Technique->addRenderPass(m_normalDiffuseGL2RenderPass);
    m_normalDiffuseES2Technique->addRenderPass(m_normalDiffuseES2RenderPass);

    m_normalDiffuseEffect->addTechnique(m_normalDiffuseGL3Technique);
    m_normalDiffuseEffect->addTechnique(m_normalDiffuseGL2Technique);
    m_normalDiffuseEffect->addTechnique(m_normalDiffuseES2Technique);

    m_normalDiffuseEffect->addParameter(m_ambientParameter);
    m_normalDiffuseEffect->addParameter(m_diffuseParameter);
    m_normalDiffuseEffect->addParameter(m_normalParameter);
    m_normalDiffuseEffect->addParameter(m_specularParameter);
    m_normalDiffuseEffect->addParameter(m_shininessParameter);
    m_normalDiffuseEffect->addParameter(m_textureScaleParameter);

    q->setEffect(m_normalDiffuseEffect);
}


/*!
    \class Qt3DRender::QNormalDiffuseMapAlphaMaterial
    \brief The QNormalDiffuseMapAlphaMaterial provides a default implementation of the phong lighting and bump effect where the diffuse light component
    is read from a texture map and the normals of the mesh being rendered from a normal texture map. In addition, it defines an alpha to coverage and
    a depth test to be performed in the rendering pass.
    \inmodule Qt3DRender
    \since 5.5

    The specular lighting effect is based on the combination of 3 lighting components ambient, diffuse and specular.
    The relative strengths of these components is 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 Qt3DRender::QNormalDiffuseMapAlphaMaterial instance with parent object \a parent.
*/
QNormalDiffuseMapAlphaMaterial::QNormalDiffuseMapAlphaMaterial(QNode *parent)
    : QNormalDiffuseMapMaterial(*new QNormalDiffuseMapAlphaMaterialPrivate, parent)
{
}

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

} // namespace Qt3DRender

QT_END_NAMESPACE
