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

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

QT_BEGIN_NAMESPACE

QSSGRenderRenderBuffer::QSSGRenderRenderBuffer(const QSSGRef<QSSGRenderContext> &context,
                                                   QSSGRenderRenderBufferFormat format,
                                                   quint32 width,
                                                   quint32 height)
    : m_context(context), m_backend(context->backend()), m_width(width), m_height(height), m_storageFormat(format), m_handle(nullptr)
{
    setSize(QSize(width, height));
}

QSSGRenderRenderBuffer::~QSSGRenderRenderBuffer()
{
    m_backend->releaseRenderbuffer(m_handle);
    m_handle = nullptr;
}

void QSSGRenderRenderBuffer::setSize(const QSize &inDimensions)
{
    qint32 maxWidth, maxHeight;
    m_width = inDimensions.width();
    m_height = inDimensions.height();

    // get max size and clamp to max value
    m_context->maxTextureSize(maxWidth, maxHeight);
    if (m_width > maxWidth || m_height > maxHeight) {
        qCCritical(INVALID_OPERATION, "Width or height is greater than max texture size (%d, %d)", maxWidth, maxHeight);
        m_width = qMin(m_width, maxWidth);
        m_height = qMin(m_height, maxHeight);
    }

    bool success = true;

    if (m_handle == nullptr)
        m_handle = m_backend->createRenderbuffer(m_storageFormat, m_width, m_height);
    else
        success = m_backend->resizeRenderbuffer(m_handle, m_storageFormat, m_width, m_height);

    if (m_handle == nullptr || !success) {
        // We could try smaller sizes
        Q_ASSERT(false);
        qCCritical(INTERNAL_ERROR,
                   "Unable to create render buffer %s, %dx%d",
                   toString(m_storageFormat),
                   m_width,
                   m_height);
    }
}

QT_END_NAMESPACE