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** Copyright (C) 2019 The Qt Company Ltd.
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** This file is part of Qt Quick 3D.
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** the Free Software Foundation and appearing in the file LICENSE.GPL3
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#include "qssgrendergeometry_p.h"
#include "qssgrendermesh_p.h"
#include "resourcemanager/qssgrenderbuffermanager_p.h"

QSSGRenderGeometry::QSSGRenderGeometry()
    : QSSGRenderGraphObject(QSSGRenderGraphObject::Type::Geometry)
{
    Q_STATIC_ASSERT(int(Triangles) == int(QSSGMeshUtilities::MeshData::Triangles));
    Q_STATIC_ASSERT(int(Attribute::ColorSemantic) == int(QSSGMeshUtilities::MeshData::Attribute::ColorSemantic));
    Q_STATIC_ASSERT(int(Attribute::F32Type) == int(QSSGMeshUtilities::MeshData::Attribute::F32Type));
}

QSSGRenderGeometry::~QSSGRenderGeometry()
{
}

const QByteArray &QSSGRenderGeometry::vertexBuffer() const
{
    return m_meshData.m_vertexBuffer;
}

QByteArray &QSSGRenderGeometry::vertexBuffer()
{
    return m_meshData.m_vertexBuffer;
}

const QByteArray &QSSGRenderGeometry::indexBuffer() const
{
    return m_meshData.m_indexBuffer;
}

QByteArray &QSSGRenderGeometry::indexBuffer()
{
    return m_meshData.m_indexBuffer;
}

int QSSGRenderGeometry::attributeCount() const
{
    return m_meshData.m_attributeCount;
}

QVector3D QSSGRenderGeometry::boundsMin() const
{
    return m_bounds.minimum;
}

QVector3D QSSGRenderGeometry::boundsMax() const
{
    return m_bounds.maximum;
}

int QSSGRenderGeometry::stride() const
{
    return m_meshData.m_stride;
}

QSSGRenderGeometry::PrimitiveType QSSGRenderGeometry::primitiveType() const
{
    return static_cast<QSSGRenderGeometry::PrimitiveType>(m_meshData.m_primitiveType);
}

QSSGRenderGeometry::Attribute QSSGRenderGeometry::attribute(int idx) const
{
    Attribute attr;
    const auto &mattr = m_meshData.m_attributes[idx];
    attr.offset = mattr.offset;
    attr.semantic = static_cast<QSSGRenderGeometry::Attribute::Semantic>(mattr.semantic);
    attr.componentType
            = static_cast<QSSGRenderGeometry::Attribute::ComponentType>(mattr.componentType);
    return attr;
}

void QSSGRenderGeometry::addAttribute(Attribute::Semantic semantic, int offset,
                                      Attribute::ComponentType componentType)
{
    Attribute attr;
    attr.semantic = semantic;
    attr.offset = offset;
    attr.componentType = componentType;
    addAttribute(attr);
}

void QSSGRenderGeometry::addAttribute(const Attribute &att)
{
    int index = m_meshData.m_attributeCount;
    m_meshData.m_attributes[index].semantic
            = static_cast<QSSGMeshUtilities::MeshData::Attribute::Semantic>(att.semantic);
    m_meshData.m_attributes[index].offset = att.offset;
    m_meshData.m_attributes[index].componentType
            = static_cast<QSSGMeshUtilities::MeshData::Attribute::ComponentType>(att.componentType);
    ++m_meshData.m_attributeCount;
    m_dirty = true;
}

void QSSGRenderGeometry::setStride(int stride)
{
    m_meshData.m_stride = stride;
    m_dirty = true;
}

void QSSGRenderGeometry::setPrimitiveType(PrimitiveType type)
{
    m_meshData.m_primitiveType
            = static_cast<QSSGMeshUtilities::MeshData::PrimitiveType>(type);
    m_dirty = true;
}

void QSSGRenderGeometry::setBounds(const QVector3D &min, const QVector3D &max)
{
    m_bounds = QSSGBounds3(min, max);
    m_dirty = true;
}

void QSSGRenderGeometry::clear()
{
    m_meshData.clear();
    m_bounds.setEmpty();
    m_dirty = true;
}

void QSSGRenderGeometry::clearAttributes()
{
    m_meshData.m_attributeCount = 0;
}

void QSSGRenderGeometry::setVertexData(const QByteArray &data)
{
    m_meshData.m_vertexBuffer = data;
    m_dirty = true;
}

void QSSGRenderGeometry::setIndexData(const QByteArray &data)
{
    m_meshData.m_indexBuffer = data;
    m_dirty = true;
}

QSSGRenderMesh *QSSGRenderGeometry::createOrUpdate(const QSSGRef<QSSGBufferManager> &bufferManager)
{
    if (!m_meshBuilder)
        m_meshBuilder = QSSGMeshUtilities::QSSGMeshBuilder::createMeshBuilder();

    if (m_dirty) {
        QString error;
        auto mesh = m_meshBuilder->buildMesh(m_meshData, error, m_bounds);
        auto renderMesh = bufferManager->loadCustomMesh(this, mesh, true);
        m_meshBuilder->reset();
        m_dirty = false;
        return renderMesh;
    }

    return bufferManager->getMesh(this);
}
