qt-everywhere-src-5.15.1/qtquick3d/src/runtimerender/resourcemanager/qssgrenderresourcebufferobjects.cpp

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** Copyright (C) 2019 The Qt Company Ltd.
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#include "qssgrenderresourcebufferobjects_p.h"

QT_BEGIN_NAMESPACE

QSSGResourceFrameBuffer::QSSGResourceFrameBuffer(const QSSGRef<QSSGResourceManager> &mgr)
    : m_resourceManager(mgr)
{
}

QSSGResourceFrameBuffer::~QSSGResourceFrameBuffer()
{
    releaseFrameBuffer();
}

bool QSSGResourceFrameBuffer::ensureFrameBuffer()
{
    if (!m_frameBuffer) {
        m_frameBuffer = m_resourceManager->allocateFrameBuffer();
        return true;
    }
    return false;
}

void QSSGResourceFrameBuffer::releaseFrameBuffer()
{
    if (m_frameBuffer) {
        m_resourceManager->release(m_frameBuffer);
    }
}

QSSGResourceRenderBuffer::QSSGResourceRenderBuffer(const QSSGRef<QSSGResourceManager> &mgr)
    : m_resourceManager(mgr)
{
}

QSSGResourceRenderBuffer::~QSSGResourceRenderBuffer()
{
    releaseRenderBuffer();
}

bool QSSGResourceRenderBuffer::ensureRenderBuffer(qint32 width, qint32 height, QSSGRenderRenderBufferFormat storageFormat)
{
    if (m_renderBuffer == nullptr || m_dimensions.width() != width || m_dimensions.height() != height || m_storageFormat != storageFormat) {
        if (m_renderBuffer == nullptr || m_storageFormat != storageFormat) {
            releaseRenderBuffer();
            m_renderBuffer = m_resourceManager->allocateRenderBuffer(width, height, storageFormat);
        } else
            m_renderBuffer->setSize(QSize(width, height));
        m_dimensions = m_renderBuffer->size();
        m_storageFormat = m_renderBuffer->storageFormat();
        return true;
    }
    return false;
}

void QSSGResourceRenderBuffer::releaseRenderBuffer()
{
    if (m_renderBuffer) {
        m_resourceManager->release(m_renderBuffer);
        m_renderBuffer = nullptr;
    }
}

QT_END_NAMESPACE