qt-everywhere-src-5.14.1/qtquick3d/src/render/qssgrenderindexbuffer.cpp

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#include <QtQuick3DRender/private/qssgrenderindexbuffer_p.h>
#include <QtQuick3DRender/private/qssgrendercontext_p.h>
#include <QtQuick3DUtils/private/qssgutils_p.h>

QT_BEGIN_NAMESPACE

QSSGRenderIndexBuffer::QSSGRenderIndexBuffer(const QSSGRef<QSSGRenderContext> &context,
                                                 QSSGRenderBufferUsageType usageType,
                                                 QSSGRenderComponentType componentType,
                                                 QSSGByteView data)
    : QSSGRenderDataBuffer(context, QSSGRenderBufferType::Index, usageType, data),
      m_componentType(componentType)
{
}

QSSGRenderIndexBuffer::~QSSGRenderIndexBuffer()
{
}

quint32 QSSGRenderIndexBuffer::numIndices() const
{
    quint32 dtypeSize = getSizeOfType(m_componentType);
    return m_bufferCapacity / dtypeSize;
}

void QSSGRenderIndexBuffer::draw(QSSGRenderDrawMode drawMode, quint32 count, quint32 offset)
{
    m_backend->drawIndexed(drawMode, count, m_componentType, reinterpret_cast<const void *>(quintptr(offset * getSizeOfType(m_componentType))));
}

void QSSGRenderIndexBuffer::bind()
{
    if (m_mapped) {
        qCCritical(INVALID_OPERATION, "Attempting to Bind a locked buffer");
        Q_ASSERT(false);
    }

    m_backend->bindBuffer(m_handle, m_type);
}

QT_END_NAMESPACE