qrhinull.cpp

Go to the documentation of this file.

// Copyright (C) 2023 The Qt Company Ltd.
// SPDX-License-Identifier: LicenseRef-Qt-Commercial OR LGPL-3.0-only OR GPL-2.0-only OR GPL-3.0-only
 
#include "qrhinull_p.h"
#include <qmath.h>
#include <QPainter>
 
QT_BEGIN_NAMESPACE
 
QRhiNull::QRhiNull(QRhiNullInitParams *params)
    : offscreenCommandBuffer(this)
{
    Q_UNUSED(params);
}
 
bool QRhiNull::create(QRhi::Flags flags)
{
    Q_UNUSED(flags);
    return true;
}
 
void QRhiNull::destroy()
{
}
 
QList<int> QRhiNull::supportedSampleCounts() const
{
    return { 1 };
}
 
QRhiSwapChain *QRhiNull::createSwapChain()
{
    return new QNullSwapChain(this);
}
 
QRhiBuffer *QRhiNull::createBuffer(QRhiBuffer::Type type, QRhiBuffer::UsageFlags usage, quint32 size)
{
    return new QNullBuffer(this, type, usage, size);
}
 
int QRhiNull::ubufAlignment() const
{
    return 256;
}
 
bool QRhiNull::isYUpInFramebuffer() const
{
    return false;
}
 
bool QRhiNull::isYUpInNDC() const
{
    return true;
}
 
bool QRhiNull::isClipDepthZeroToOne() const
{
    return true;
}
 
QMatrix4x4 QRhiNull::clipSpaceCorrMatrix() const
{
    return QMatrix4x4(); // identity
}
 
bool QRhiNull::isTextureFormatSupported(QRhiTexture::Format format, QRhiTexture::Flags flags) const
{
    Q_UNUSED(format);
    Q_UNUSED(flags);
    return true;
}
 
bool QRhiNull::isFeatureSupported(QRhi::Feature feature) const
{
    Q_UNUSED(feature);
    return true;
}
 
int QRhiNull::resourceLimit(QRhi::ResourceLimit limit) const
{
    switch (limit) {
    case QRhi::TextureSizeMin:
        return 1;
    case QRhi::TextureSizeMax:
        return 16384;
    case QRhi::MaxColorAttachments:
        return 8;
    case QRhi::FramesInFlight:
        return 1;
    case QRhi::MaxAsyncReadbackFrames:
        return 1;
    case QRhi::MaxThreadGroupsPerDimension:
        return 0;
    case QRhi::MaxThreadsPerThreadGroup:
        return 0;
    case QRhi::MaxThreadGroupX:
        return 0;
    case QRhi::MaxThreadGroupY:
        return 0;
    case QRhi::MaxThreadGroupZ:
        return 0;
    case QRhi::TextureArraySizeMax:
        return 2048;
    case QRhi::MaxUniformBufferRange:
        return 65536;
    case QRhi::MaxVertexInputs:
        return 32;
    case QRhi::MaxVertexOutputs:
        return 32;
    }
 
    Q_UNREACHABLE_RETURN(0);
}
 
const QRhiNativeHandles *QRhiNull::nativeHandles()
{
    return &nativeHandlesStruct;
}
 
QRhiDriverInfo QRhiNull::driverInfo() const
{
    QRhiDriverInfo info;
    info.deviceName = QByteArrayLiteral("Null");
    return info;
}
 
QRhiStats QRhiNull::statistics()
{
    return {};
}
 
bool QRhiNull::makeThreadLocalNativeContextCurrent()
{
    // not applicable
    return false;
}
 
void QRhiNull::releaseCachedResources()
{
    // nothing to do here
}
 
bool QRhiNull::isDeviceLost() const
{
    return false;
}
 
QByteArray QRhiNull::pipelineCacheData()
{
    return QByteArray();
}
 
void QRhiNull::setPipelineCacheData(const QByteArray &data)
{
    Q_UNUSED(data);
}
 
QRhiRenderBuffer *QRhiNull::createRenderBuffer(QRhiRenderBuffer::Type type, const QSize &pixelSize,
                                               int sampleCount, QRhiRenderBuffer::Flags flags,
                                               QRhiTexture::Format backingFormatHint)
{
    return new QNullRenderBuffer(this, type, pixelSize, sampleCount, flags, backingFormatHint);
}
 
QRhiTexture *QRhiNull::createTexture(QRhiTexture::Format format,
                                     const QSize &pixelSize, int depth, int arraySize,
                                     int sampleCount, QRhiTexture::Flags flags)
{
    return new QNullTexture(this, format, pixelSize, depth, arraySize, sampleCount, flags);
}
 
QRhiSampler *QRhiNull::createSampler(QRhiSampler::Filter magFilter, QRhiSampler::Filter minFilter,
                                     QRhiSampler::Filter mipmapMode,
                                     QRhiSampler::AddressMode u, QRhiSampler::AddressMode v, QRhiSampler::AddressMode w)
{
    return new QNullSampler(this, magFilter, minFilter, mipmapMode, u, v, w);
}
 
QRhiTextureRenderTarget *QRhiNull::createTextureRenderTarget(const QRhiTextureRenderTargetDescription &desc,
                                                             QRhiTextureRenderTarget::Flags flags)
{
    return new QNullTextureRenderTarget(this, desc, flags);
}
 
QRhiGraphicsPipeline *QRhiNull::createGraphicsPipeline()
{
    return new QNullGraphicsPipeline(this);
}
 
QRhiComputePipeline *QRhiNull::createComputePipeline()
{
    return new QNullComputePipeline(this);
}
 
QRhiShaderResourceBindings *QRhiNull::createShaderResourceBindings()
{
    return new QNullShaderResourceBindings(this);
}
 
void QRhiNull::setGraphicsPipeline(QRhiCommandBuffer *cb, QRhiGraphicsPipeline *ps)
{
    Q_UNUSED(cb);
    Q_UNUSED(ps);
}
 
void QRhiNull::setShaderResources(QRhiCommandBuffer *cb, QRhiShaderResourceBindings *srb,
                                  int dynamicOffsetCount,
                                  const QRhiCommandBuffer::DynamicOffset *dynamicOffsets)
{
    Q_UNUSED(cb);
    Q_UNUSED(srb);
    Q_UNUSED(dynamicOffsetCount);
    Q_UNUSED(dynamicOffsets);
}
 
void QRhiNull::setVertexInput(QRhiCommandBuffer *cb,
                              int startBinding, int bindingCount, const QRhiCommandBuffer::VertexInput *bindings,
                              QRhiBuffer *indexBuf, quint32 indexOffset, QRhiCommandBuffer::IndexFormat indexFormat)
{
    Q_UNUSED(cb);
    Q_UNUSED(startBinding);
    Q_UNUSED(bindingCount);
    Q_UNUSED(bindings);
    Q_UNUSED(indexBuf);
    Q_UNUSED(indexOffset);
    Q_UNUSED(indexFormat);
}
 
void QRhiNull::setViewport(QRhiCommandBuffer *cb, const QRhiViewport &viewport)
{
    Q_UNUSED(cb);
    Q_UNUSED(viewport);
}
 
void QRhiNull::setScissor(QRhiCommandBuffer *cb, const QRhiScissor &scissor)
{
    Q_UNUSED(cb);
    Q_UNUSED(scissor);
}
 
void QRhiNull::setBlendConstants(QRhiCommandBuffer *cb, const QColor &c)
{
    Q_UNUSED(cb);
    Q_UNUSED(c);
}
 
void QRhiNull::setStencilRef(QRhiCommandBuffer *cb, quint32 refValue)
{
    Q_UNUSED(cb);
    Q_UNUSED(refValue);
}
 
void QRhiNull::draw(QRhiCommandBuffer *cb, quint32 vertexCount,
                    quint32 instanceCount, quint32 firstVertex, quint32 firstInstance)
{
    Q_UNUSED(cb);
    Q_UNUSED(vertexCount);
    Q_UNUSED(instanceCount);
    Q_UNUSED(firstVertex);
    Q_UNUSED(firstInstance);
}
 
void QRhiNull::drawIndexed(QRhiCommandBuffer *cb, quint32 indexCount,
                           quint32 instanceCount, quint32 firstIndex, qint32 vertexOffset, quint32 firstInstance)
{
    Q_UNUSED(cb);
    Q_UNUSED(indexCount);
    Q_UNUSED(instanceCount);
    Q_UNUSED(firstIndex);
    Q_UNUSED(vertexOffset);
    Q_UNUSED(firstInstance);
}
 
void QRhiNull::debugMarkBegin(QRhiCommandBuffer *cb, const QByteArray &name)
{
    Q_UNUSED(cb);
    Q_UNUSED(name);
}
 
void QRhiNull::debugMarkEnd(QRhiCommandBuffer *cb)
{
    Q_UNUSED(cb);
}
 
void QRhiNull::debugMarkMsg(QRhiCommandBuffer *cb, const QByteArray &msg)
{
    Q_UNUSED(cb);
    Q_UNUSED(msg);
}
 
void QRhiNull::setComputePipeline(QRhiCommandBuffer *cb, QRhiComputePipeline *ps)
{
    Q_UNUSED(cb);
    Q_UNUSED(ps);
}
 
void QRhiNull::dispatch(QRhiCommandBuffer *cb, int x, int y, int z)
{
    Q_UNUSED(cb);
    Q_UNUSED(x);
    Q_UNUSED(y);
    Q_UNUSED(z);
}
 
const QRhiNativeHandles *QRhiNull::nativeHandles(QRhiCommandBuffer *cb)
{
    Q_UNUSED(cb);
    return nullptr;
}
 
void QRhiNull::beginExternal(QRhiCommandBuffer *cb)
{
    Q_UNUSED(cb);
}
 
void QRhiNull::endExternal(QRhiCommandBuffer *cb)
{
    Q_UNUSED(cb);
}
 
double QRhiNull::lastCompletedGpuTime(QRhiCommandBuffer *cb)
{
    Q_UNUSED(cb);
    return 0;
}
 
QRhi::FrameOpResult QRhiNull::beginFrame(QRhiSwapChain *swapChain, QRhi::BeginFrameFlags flags)
{
    Q_UNUSED(flags);
    currentSwapChain = swapChain;
    return QRhi::FrameOpSuccess;
}
 
QRhi::FrameOpResult QRhiNull::endFrame(QRhiSwapChain *swapChain, QRhi::EndFrameFlags flags)
{
    Q_UNUSED(flags);
    QNullSwapChain *swapChainD = QRHI_RES(QNullSwapChain, swapChain);
    swapChainD->frameCount += 1;
    currentSwapChain = nullptr;
    return QRhi::FrameOpSuccess;
}
 
QRhi::FrameOpResult QRhiNull::beginOffscreenFrame(QRhiCommandBuffer **cb, QRhi::BeginFrameFlags flags)
{
    Q_UNUSED(flags);
    *cb = &offscreenCommandBuffer;
    return QRhi::FrameOpSuccess;
}
 
QRhi::FrameOpResult QRhiNull::endOffscreenFrame(QRhi::EndFrameFlags flags)
{
    Q_UNUSED(flags);
    return QRhi::FrameOpSuccess;
}
 
QRhi::FrameOpResult QRhiNull::finish()
{
    return QRhi::FrameOpSuccess;
}
 
void QRhiNull::simulateTextureUpload(const QRhiResourceUpdateBatchPrivate::TextureOp &u)
{
    QNullTexture *texD = QRHI_RES(QNullTexture, u.dst);
    for (int layer = 0, maxLayer = u.subresDesc.size(); layer < maxLayer; ++layer) {
        for (int level = 0; level < QRhi::MAX_MIP_LEVELS; ++level) {
            for (const QRhiTextureSubresourceUploadDescription &subresDesc : std::as_const(u.subresDesc[layer][level])) {
                if (!subresDesc.image().isNull()) {
                    const QImage src = subresDesc.image();
                    QPainter painter(&texD->image[layer][level]);
                    const QSize srcSize = subresDesc.sourceSize().isEmpty()
                            ? src.size() : subresDesc.sourceSize();
                    painter.setCompositionMode(QPainter::CompositionMode_Source);
                    painter.drawImage(subresDesc.destinationTopLeft(), src,
                                      QRect(subresDesc.sourceTopLeft(), srcSize));
                } else if (!subresDesc.data().isEmpty()) {
                    const QSize subresSize = q->sizeForMipLevel(level, texD->pixelSize());
                    int w = subresSize.width();
                    int h = subresSize.height();
                    if (!subresDesc.sourceSize().isEmpty()) {
                        w = subresDesc.sourceSize().width();
                        h = subresDesc.sourceSize().height();
                    }
                    // sourceTopLeft is not supported on this path as per QRhi docs
                    const char *src = subresDesc.data().constData();
                    const int srcBpl = w * 4;
                    int srcStride = srcBpl;
                    if (subresDesc.dataStride())
                        srcStride = subresDesc.dataStride();
                    const QPoint dstOffset = subresDesc.destinationTopLeft();
                    uchar *dst = texD->image[layer][level].bits();
                    const int dstBpl = texD->image[layer][level].bytesPerLine();
                    for (int y = 0; y < h; ++y) {
                        memcpy(dst + dstOffset.x() * 4 + (y + dstOffset.y()) * dstBpl,
                               src + y * srcStride,
                               size_t(srcBpl));
                    }
                }
            }
        }
    }
}
 
void QRhiNull::simulateTextureCopy(const QRhiResourceUpdateBatchPrivate::TextureOp &u)
{
    QNullTexture *srcD = QRHI_RES(QNullTexture, u.src);
    QNullTexture *dstD = QRHI_RES(QNullTexture, u.dst);
    const QImage &srcImage(srcD->image[u.desc.sourceLayer()][u.desc.sourceLevel()]);
    QImage &dstImage(dstD->image[u.desc.destinationLayer()][u.desc.destinationLevel()]);
    const QPoint dstPos = u.desc.destinationTopLeft();
    const QSize size = u.desc.pixelSize().isEmpty() ? srcD->pixelSize() : u.desc.pixelSize();
    const QPoint srcPos = u.desc.sourceTopLeft();
 
    QPainter painter(&dstImage);
    painter.setCompositionMode(QPainter::CompositionMode_Source);
    painter.drawImage(QRect(dstPos, size), srcImage, QRect(srcPos, size));
}
 
void QRhiNull::simulateTextureGenMips(const QRhiResourceUpdateBatchPrivate::TextureOp &u)
{
    QNullTexture *texD = QRHI_RES(QNullTexture, u.dst);
    const QSize baseSize = texD->pixelSize();
    const int levelCount = q->mipLevelsForSize(baseSize);
    for (int level = 1; level < levelCount; ++level)
        texD->image[0][level] = texD->image[0][0].scaled(q->sizeForMipLevel(level, baseSize));
}
 
void QRhiNull::resourceUpdate(QRhiCommandBuffer *cb, QRhiResourceUpdateBatch *resourceUpdates)
{
    Q_UNUSED(cb);
    QRhiResourceUpdateBatchPrivate *ud = QRhiResourceUpdateBatchPrivate::get(resourceUpdates);
    for (int opIdx = 0; opIdx < ud->activeBufferOpCount; ++opIdx) {
        const QRhiResourceUpdateBatchPrivate::BufferOp &u(ud->bufferOps[opIdx]);
        if (u.type == QRhiResourceUpdateBatchPrivate::BufferOp::DynamicUpdate
                || u.type == QRhiResourceUpdateBatchPrivate::BufferOp::StaticUpload)
        {
            QNullBuffer *bufD = QRHI_RES(QNullBuffer, u.buf);
            memcpy(bufD->data + u.offset, u.data.constData(), size_t(u.data.size()));
        } else if (u.type == QRhiResourceUpdateBatchPrivate::BufferOp::Read) {
            QRhiReadbackResult *result = u.result;
            result->data.resize(u.readSize);
            QNullBuffer *bufD = QRHI_RES(QNullBuffer, u.buf);
            memcpy(result->data.data(), bufD->data + u.offset, size_t(u.readSize));
            if (result->completed)
                result->completed();
        }
    }
    for (int opIdx = 0; opIdx < ud->activeTextureOpCount; ++opIdx) {
        const QRhiResourceUpdateBatchPrivate::TextureOp &u(ud->textureOps[opIdx]);
        if (u.type == QRhiResourceUpdateBatchPrivate::TextureOp::Upload) {
            if (u.dst->format() == QRhiTexture::RGBA8)
                simulateTextureUpload(u);
        } else if (u.type == QRhiResourceUpdateBatchPrivate::TextureOp::Copy) {
            if (u.src->format() == QRhiTexture::RGBA8 && u.dst->format() == QRhiTexture::RGBA8)
                simulateTextureCopy(u);
        } else if (u.type == QRhiResourceUpdateBatchPrivate::TextureOp::Read) {
            QRhiReadbackResult *result = u.result;
            QNullTexture *texD = QRHI_RES(QNullTexture, u.rb.texture());
            if (texD) {
                result->format = texD->format();
                result->pixelSize = q->sizeForMipLevel(u.rb.level(), texD->pixelSize());
            } else {
                Q_ASSERT(currentSwapChain);
                result->format = QRhiTexture::RGBA8;
                result->pixelSize = currentSwapChain->currentPixelSize();
            }
            quint32 bytesPerLine = 0;
            quint32 byteSize = 0;
            textureFormatInfo(result->format, result->pixelSize, &bytesPerLine, &byteSize, nullptr);
            if (texD && texD->format() == QRhiTexture::RGBA8) {
                result->data.resize(int(byteSize));
                const QImage &src(texD->image[u.rb.layer()][u.rb.level()]);
                char *dst = result->data.data();
                for (int y = 0, h = src.height(); y < h; ++y) {
                    memcpy(dst, src.constScanLine(y), bytesPerLine);
                    dst += bytesPerLine;
                }
            } else {
                result->data.fill(0, int(byteSize));
            }
            if (result->completed)
                result->completed();
        } else if (u.type == QRhiResourceUpdateBatchPrivate::TextureOp::GenMips) {
            if (u.dst->format() == QRhiTexture::RGBA8)
                simulateTextureGenMips(u);
        }
    }
    ud->free();
}
 
void QRhiNull::beginPass(QRhiCommandBuffer *cb,
                         QRhiRenderTarget *rt,
                         const QColor &colorClearValue,
                         const QRhiDepthStencilClearValue &depthStencilClearValue,
                         QRhiResourceUpdateBatch *resourceUpdates,
                         QRhiCommandBuffer::BeginPassFlags flags)
{
    Q_UNUSED(colorClearValue);
    Q_UNUSED(depthStencilClearValue);
    Q_UNUSED(flags);
 
    if (resourceUpdates)
        resourceUpdate(cb, resourceUpdates);
 
    if (rt->resourceType() == QRhiRenderTarget::TextureRenderTarget) {
        QNullTextureRenderTarget *rtTex = QRHI_RES(QNullTextureRenderTarget, rt);
        if (!QRhiRenderTargetAttachmentTracker::isUpToDate<QNullTexture, QNullRenderBuffer>(rtTex->description(), rtTex->d.currentResIdList))
            rtTex->create();
    }
}
 
void QRhiNull::endPass(QRhiCommandBuffer *cb, QRhiResourceUpdateBatch *resourceUpdates)
{
    if (resourceUpdates)
        resourceUpdate(cb, resourceUpdates);
}
 
void QRhiNull::beginComputePass(QRhiCommandBuffer *cb,
                                QRhiResourceUpdateBatch *resourceUpdates,
                                QRhiCommandBuffer::BeginPassFlags flags)
{
    Q_UNUSED(flags);
    if (resourceUpdates)
        resourceUpdate(cb, resourceUpdates);
}
 
void QRhiNull::endComputePass(QRhiCommandBuffer *cb, QRhiResourceUpdateBatch *resourceUpdates)
{
    if (resourceUpdates)
        resourceUpdate(cb, resourceUpdates);
}
 
QNullBuffer::QNullBuffer(QRhiImplementation *rhi, Type type, UsageFlags usage, quint32 size)
    : QRhiBuffer(rhi, type, usage, size)
{
}
 
QNullBuffer::~QNullBuffer()
{
    destroy();
}
 
void QNullBuffer::destroy()
{
    delete[] data;
    data = nullptr;
 
    QRHI_RES_RHI(QRhiNull);
    if (rhiD)
        rhiD->unregisterResource(this);
}
 
bool QNullBuffer::create()
{
    if (data)
        destroy();
 
    data = new char[m_size];
    memset(data, 0, m_size);
 
    QRHI_RES_RHI(QRhiNull);
    rhiD->registerResource(this);
 
    return true;
}
 
char *QNullBuffer::beginFullDynamicBufferUpdateForCurrentFrame()
{
    Q_ASSERT(m_type == Dynamic);
    return data;
}
 
QNullRenderBuffer::QNullRenderBuffer(QRhiImplementation *rhi, Type type, const QSize &pixelSize,
                                     int sampleCount, QRhiRenderBuffer::Flags flags,
                                     QRhiTexture::Format backingFormatHint)
    : QRhiRenderBuffer(rhi, type, pixelSize, sampleCount, flags, backingFormatHint)
{
}
 
QNullRenderBuffer::~QNullRenderBuffer()
{
    destroy();
}
 
void QNullRenderBuffer::destroy()
{
    valid = false;
 
    QRHI_RES_RHI(QRhiNull);
    if (rhiD)
        rhiD->unregisterResource(this);
}
 
bool QNullRenderBuffer::create()
{
    if (valid)
        destroy();
 
    valid = true;
    generation += 1;
 
    QRHI_RES_RHI(QRhiNull);
    rhiD->registerResource(this);
 
    return true;
}
 
QRhiTexture::Format QNullRenderBuffer::backingFormat() const
{
    return m_type == Color ? QRhiTexture::RGBA8 : QRhiTexture::UnknownFormat;
}
 
QNullTexture::QNullTexture(QRhiImplementation *rhi, Format format, const QSize &pixelSize, int depth,
                           int arraySize, int sampleCount, Flags flags)
    : QRhiTexture(rhi, format, pixelSize, depth, arraySize, sampleCount, flags)
{
}
 
QNullTexture::~QNullTexture()
{
    destroy();
}
 
void QNullTexture::destroy()
{
    valid = false;
 
    QRHI_RES_RHI(QRhiNull);
    if (rhiD)
        rhiD->unregisterResource(this);
}
 
bool QNullTexture::create()
{
    if (valid)
        destroy();
 
    valid = true;
 
    QRHI_RES_RHI(QRhiNull);
    const bool isCube = m_flags.testFlag(CubeMap);
    const bool is3D = m_flags.testFlag(ThreeDimensional);
    const bool isArray = m_flags.testFlag(TextureArray);
    const bool hasMipMaps = m_flags.testFlag(MipMapped);
    const bool is1D = m_flags.testFlags(OneDimensional);
    QSize size = is1D ? QSize(qMax(1, m_pixelSize.width()), 1)
                      : (m_pixelSize.isEmpty() ? QSize(1, 1) : m_pixelSize);
    const int mipLevelCount = hasMipMaps ? rhiD->q->mipLevelsForSize(size) : 1;
    const int layerCount = is3D ? qMax(1, m_depth)
                                : (isCube ? 6
                                          : (isArray ? qMax(0, m_arraySize)
                                                     : 1));
 
    if (m_format == RGBA8) {
        image.resize(layerCount);
        for (int layer = 0; layer < layerCount; ++layer) {
            for (int level = 0; level < mipLevelCount; ++level) {
                image[layer][level] = QImage(rhiD->q->sizeForMipLevel(level, size),
                                             QImage::Format_RGBA8888_Premultiplied);
                image[layer][level].fill(Qt::yellow);
            }
        }
    }
 
    generation += 1;
 
    rhiD->registerResource(this);
 
    return true;
}
 
bool QNullTexture::createFrom(QRhiTexture::NativeTexture src)
{
    Q_UNUSED(src);
    if (valid)
        destroy();
 
    valid = true;
 
    generation += 1;
 
    QRHI_RES_RHI(QRhiNull);
    rhiD->registerResource(this);
 
    return true;
}
 
QNullSampler::QNullSampler(QRhiImplementation *rhi, Filter magFilter, Filter minFilter, Filter mipmapMode,
                           AddressMode u, AddressMode v, AddressMode w)
    : QRhiSampler(rhi, magFilter, minFilter, mipmapMode, u, v, w)
{
}
 
QNullSampler::~QNullSampler()
{
    destroy();
}
 
void QNullSampler::destroy()
{
    QRHI_RES_RHI(QRhiNull);
    if (rhiD)
        rhiD->unregisterResource(this);
}
 
bool QNullSampler::create()
{
    QRHI_RES_RHI(QRhiNull);
    rhiD->registerResource(this);
    return true;
}
 
QNullRenderPassDescriptor::QNullRenderPassDescriptor(QRhiImplementation *rhi)
    : QRhiRenderPassDescriptor(rhi)
{
}
 
QNullRenderPassDescriptor::~QNullRenderPassDescriptor()
{
    destroy();
}
 
void QNullRenderPassDescriptor::destroy()
{
    QRHI_RES_RHI(QRhiNull);
    if (rhiD)
        rhiD->unregisterResource(this);
}
 
bool QNullRenderPassDescriptor::isCompatible(const QRhiRenderPassDescriptor *other) const
{
    Q_UNUSED(other);
    return true;
}
 
QRhiRenderPassDescriptor *QNullRenderPassDescriptor::newCompatibleRenderPassDescriptor() const
{
    QNullRenderPassDescriptor *rpD = new QNullRenderPassDescriptor(m_rhi);
    QRHI_RES_RHI(QRhiNull);
    rhiD->registerResource(rpD, false);
    return rpD;
}
 
QVector<quint32> QNullRenderPassDescriptor::serializedFormat() const
{
    return {};
}
 
QNullSwapChainRenderTarget::QNullSwapChainRenderTarget(QRhiImplementation *rhi, QRhiSwapChain *swapchain)
    : QRhiSwapChainRenderTarget(rhi, swapchain),
      d(rhi)
{
}
 
QNullSwapChainRenderTarget::~QNullSwapChainRenderTarget()
{
    destroy();
}
 
void QNullSwapChainRenderTarget::destroy()
{
}
 
QSize QNullSwapChainRenderTarget::pixelSize() const
{
    return d.pixelSize;
}
 
float QNullSwapChainRenderTarget::devicePixelRatio() const
{
    return d.dpr;
}
 
int QNullSwapChainRenderTarget::sampleCount() const
{
    return 1;
}
 
QNullTextureRenderTarget::QNullTextureRenderTarget(QRhiImplementation *rhi,
                                                   const QRhiTextureRenderTargetDescription &desc,
                                                   Flags flags)
    : QRhiTextureRenderTarget(rhi, desc, flags),
      d(rhi)
{
}
 
QNullTextureRenderTarget::~QNullTextureRenderTarget()
{
    destroy();
}
 
void QNullTextureRenderTarget::destroy()
{
    QRHI_RES_RHI(QRhiNull);
    if (rhiD)
        rhiD->unregisterResource(this);
}
 
QRhiRenderPassDescriptor *QNullTextureRenderTarget::newCompatibleRenderPassDescriptor()
{
    QNullRenderPassDescriptor *rpD = new QNullRenderPassDescriptor(m_rhi);
    QRHI_RES_RHI(QRhiNull);
    rhiD->registerResource(rpD, false);
    return rpD;
}
 
bool QNullTextureRenderTarget::create()
{
    QRHI_RES_RHI(QRhiNull);
    d.rp = QRHI_RES(QNullRenderPassDescriptor, m_renderPassDesc);
    if (m_desc.cbeginColorAttachments() != m_desc.cendColorAttachments()) {
        const QRhiColorAttachment *colorAtt = m_desc.cbeginColorAttachments();
        QRhiTexture *tex = colorAtt->texture();
        QRhiRenderBuffer *rb = colorAtt->renderBuffer();
        d.pixelSize = tex ? rhiD->q->sizeForMipLevel(colorAtt->level(), tex->pixelSize()) : rb->pixelSize();
    } else if (m_desc.depthStencilBuffer()) {
        d.pixelSize = m_desc.depthStencilBuffer()->pixelSize();
    } else if (m_desc.depthTexture()) {
        d.pixelSize = m_desc.depthTexture()->pixelSize();
    }
    QRhiRenderTargetAttachmentTracker::updateResIdList<QNullTexture, QNullRenderBuffer>(m_desc, &d.currentResIdList);
    rhiD->registerResource(this);
    return true;
}
 
QSize QNullTextureRenderTarget::pixelSize() const
{
    if (!QRhiRenderTargetAttachmentTracker::isUpToDate<QNullTexture, QNullRenderBuffer>(m_desc, d.currentResIdList))
        const_cast<QNullTextureRenderTarget *>(this)->create();
 
    return d.pixelSize;
}
 
float QNullTextureRenderTarget::devicePixelRatio() const
{
    return d.dpr;
}
 
int QNullTextureRenderTarget::sampleCount() const
{
    return 1;
}
 
QNullShaderResourceBindings::QNullShaderResourceBindings(QRhiImplementation *rhi)
    : QRhiShaderResourceBindings(rhi)
{
}
 
QNullShaderResourceBindings::~QNullShaderResourceBindings()
{
    destroy();
}
 
void QNullShaderResourceBindings::destroy()
{
    QRHI_RES_RHI(QRhiNull);
    if (rhiD)
        rhiD->unregisterResource(this);
}
 
bool QNullShaderResourceBindings::create()
{
    QRHI_RES_RHI(QRhiNull);
    if (!rhiD->sanityCheckShaderResourceBindings(this))
        return false;
 
    rhiD->updateLayoutDesc(this);
 
    rhiD->registerResource(this, false);
    return true;
}
 
void QNullShaderResourceBindings::updateResources(UpdateFlags flags)
{
    Q_UNUSED(flags);
}
 
QNullGraphicsPipeline::QNullGraphicsPipeline(QRhiImplementation *rhi)
    : QRhiGraphicsPipeline(rhi)
{
}
 
QNullGraphicsPipeline::~QNullGraphicsPipeline()
{
    destroy();
}
 
void QNullGraphicsPipeline::destroy()
{
    QRHI_RES_RHI(QRhiNull);
    if (rhiD)
        rhiD->unregisterResource(this);
}
 
bool QNullGraphicsPipeline::create()
{
    QRHI_RES_RHI(QRhiNull);
    if (!rhiD->sanityCheckGraphicsPipeline(this))
        return false;
 
    rhiD->registerResource(this);
    return true;
}
 
QNullComputePipeline::QNullComputePipeline(QRhiImplementation *rhi)
    : QRhiComputePipeline(rhi)
{
}
 
QNullComputePipeline::~QNullComputePipeline()
{
    destroy();
}
 
void QNullComputePipeline::destroy()
{
    QRHI_RES_RHI(QRhiNull);
    if (rhiD)
        rhiD->unregisterResource(this);
}
 
bool QNullComputePipeline::create()
{
    QRHI_RES_RHI(QRhiNull);
    rhiD->registerResource(this);
    return true;
}
 
QNullCommandBuffer::QNullCommandBuffer(QRhiImplementation *rhi)
    : QRhiCommandBuffer(rhi)
{
}
 
QNullCommandBuffer::~QNullCommandBuffer()
{
    destroy();
}
 
void QNullCommandBuffer::destroy()
{
    // nothing to do here
}
 
QNullSwapChain::QNullSwapChain(QRhiImplementation *rhi)
    : QRhiSwapChain(rhi),
      rt(rhi, this),
      cb(rhi)
{
}
 
QNullSwapChain::~QNullSwapChain()
{
    destroy();
}
 
void QNullSwapChain::destroy()
{
    QRHI_RES_RHI(QRhiNull);
    if (rhiD)
        rhiD->unregisterResource(this);
}
 
QRhiCommandBuffer *QNullSwapChain::currentFrameCommandBuffer()
{
    return &cb;
}
 
QRhiRenderTarget *QNullSwapChain::currentFrameRenderTarget()
{
    return &rt;
}
 
QSize QNullSwapChain::surfacePixelSize()
{
    return QSize(1280, 720);
}
 
bool QNullSwapChain::isFormatSupported(Format f)
{
    return f == SDR;
}
 
QRhiRenderPassDescriptor *QNullSwapChain::newCompatibleRenderPassDescriptor()
{
    QNullRenderPassDescriptor *rpD = new QNullRenderPassDescriptor(m_rhi);
    QRHI_RES_RHI(QRhiNull);
    rhiD->registerResource(rpD, false);
    return rpD;
}
 
bool QNullSwapChain::createOrResize()
{
    const bool needsRegistration = !window || window != m_window;
    if (window && window != m_window)
        destroy();
 
    window = m_window;
    m_currentPixelSize = surfacePixelSize();
    rt.setRenderPassDescriptor(m_renderPassDesc); // for the public getter in QRhiRenderTarget
    rt.d.rp = QRHI_RES(QNullRenderPassDescriptor, m_renderPassDesc);
    rt.d.pixelSize = m_currentPixelSize;
    frameCount = 0;
 
    if (needsRegistration) {
        QRHI_RES_RHI(QRhiNull);
        rhiD->registerResource(this);
    }
 
    return true;
}
 
QT_END_NAMESPACE