qt-everywhere-src-5.15.1/qtquick3d/src/render/qssgrenderimagetexture.cpp

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#include <QtQuick3DRender/private/qssgrendercontext_p.h>
#include <QtQuick3DRender/private/qssgrenderimagetexture_p.h>
#include <QtQuick3DRender/private/qssgrendertexture2d_p.h>
#include <QtQuick3DUtils/private/qssgutils_p.h>
#include <limits>

QT_BEGIN_NAMESPACE

QSSGRenderImage2D::QSSGRenderImage2D(const QSSGRef<QSSGRenderContext> &context,
                                         const QSSGRef<QSSGRenderTexture2D> &inTexture,
                                         QSSGRenderImageAccessType inAccess)
    : m_context(context)
    , m_texture2D(inTexture)
    , m_textureUnit(std::numeric_limits<qint32>::max())
    , m_accessType(inAccess)
    , m_textureLevel(0)
{
}

QSSGRenderImage2D::~QSSGRenderImage2D()
{
}

void QSSGRenderImage2D::setTextureLevel(qint32 inLevel)
{
    if (m_texture2D && m_texture2D->numMipmaps() >= (quint32)inLevel) {
        m_textureLevel = inLevel;
    }
}

void QSSGRenderImage2D::bind(qint32 unit)
{
    if (unit == -1)
        m_textureUnit = m_context->nextTextureUnit();
    else
        m_textureUnit = unit;

    QSSGTextureDetails theDetails(m_texture2D->textureDetails());

    // note it is the callers responsibility that the texture format is supported by the compute
    // shader
    m_context->backend()->bindImageTexture(m_texture2D->handle(),
                                            m_textureUnit,
                                            m_textureLevel,
                                            false,
                                            0,
                                            m_accessType,
                                            theDetails.format);
}

QSSGRenderBackend::QSSGRenderBackendTextureObject QSSGRenderImage2D::handle()
{
    return m_texture2D->handle();
}

QT_END_NAMESPACE