// 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

#ifndef QRHINULL_P_H

#define QRHINULL_P_H

//

//  W A R N I N G

//  -------------

//

// This file is not part of the Qt API.  It exists purely as an

// implementation detail.  This header file may change from version to

// version without notice, or even be removed.

//

// We mean it.

//

#include "qrhi_p.h"

QT_BEGIN_NAMESPACE

struct QNullBuffer : public QRhiBuffer

{

    QNullBuffer(QRhiImplementation *rhi, Type type, UsageFlags usage, quint32 size);

    ~QNullBuffer();

    void destroy() override;

    bool create() override;

    char *beginFullDynamicBufferUpdateForCurrentFrame() override;

    char *data = nullptr;

};

struct QNullRenderBuffer : public QRhiRenderBuffer

{

    QNullRenderBuffer(QRhiImplementation *rhi, Type type, const QSize &pixelSize,

                      int sampleCount, QRhiRenderBuffer::Flags flags,

                      QRhiTexture::Format backingFormatHint);

    ~QNullRenderBuffer();

    void destroy() override;

    bool create() override;

    QRhiTexture::Format backingFormat() const override;

    bool valid = false;

    uint generation = 0;

};

struct QNullTexture : public QRhiTexture

{

    QNullTexture(QRhiImplementation *rhi, Format format, const QSize &pixelSize, int depth,

                 int arraySize, int sampleCount, Flags flags);

    ~QNullTexture();

    void destroy() override;

    bool create() override;

    bool createFrom(NativeTexture src) override;

    bool valid = false;

    QVarLengthArray<std::array<QImage, QRhi::MAX_MIP_LEVELS>, 6> image;

    uint generation = 0;

};

struct QNullSampler : public QRhiSampler

{

    QNullSampler(QRhiImplementation *rhi, Filter magFilter, Filter minFilter, Filter mipmapMode,

                 AddressMode u, AddressMode v, AddressMode w);

    ~QNullSampler();

    void destroy() override;

    bool create() override;

};

struct QNullRenderPassDescriptor : public QRhiRenderPassDescriptor

{

    QNullRenderPassDescriptor(QRhiImplementation *rhi);

    ~QNullRenderPassDescriptor();

    void destroy() override;

    bool isCompatible(const QRhiRenderPassDescriptor *other) const override;

    QRhiRenderPassDescriptor *newCompatibleRenderPassDescriptor() const override;

    QVector<quint32> serializedFormat() const override;

};

struct QNullRenderTargetData

{

    QNullRenderTargetData(QRhiImplementation *) { }

    QNullRenderPassDescriptor *rp = nullptr;

    QSize pixelSize;

    float dpr = 1;

    QRhiRenderTargetAttachmentTracker::ResIdList currentResIdList;

};

struct QNullSwapChainRenderTarget : public QRhiSwapChainRenderTarget

{

    QNullSwapChainRenderTarget(QRhiImplementation *rhi, QRhiSwapChain *swapchain);

    ~QNullSwapChainRenderTarget();

    void destroy() override;

    QSize pixelSize() const override;

    float devicePixelRatio() const override;

    int sampleCount() const override;

    QNullRenderTargetData d;

};

struct QNullTextureRenderTarget : public QRhiTextureRenderTarget

{

    QNullTextureRenderTarget(QRhiImplementation *rhi, const QRhiTextureRenderTargetDescription &desc, Flags flags);

    ~QNullTextureRenderTarget();

    void destroy() override;

    QSize pixelSize() const override;

    float devicePixelRatio() const override;

    int sampleCount() const override;

    QRhiRenderPassDescriptor *newCompatibleRenderPassDescriptor() override;

    bool create() override;

    QNullRenderTargetData d;

};

struct QNullShaderResourceBindings : public QRhiShaderResourceBindings

{

    QNullShaderResourceBindings(QRhiImplementation *rhi);

    ~QNullShaderResourceBindings();

    void destroy() override;

    bool create() override;

    void updateResources(UpdateFlags flags) override;

};

struct QNullGraphicsPipeline : public QRhiGraphicsPipeline

{

    QNullGraphicsPipeline(QRhiImplementation *rhi);

    ~QNullGraphicsPipeline();

    void destroy() override;

    bool create() override;

};

struct QNullComputePipeline : public QRhiComputePipeline

{

    QNullComputePipeline(QRhiImplementation *rhi);

    ~QNullComputePipeline();

    void destroy() override;

    bool create() override;

};

struct QNullCommandBuffer : public QRhiCommandBuffer

{

    QNullCommandBuffer(QRhiImplementation *rhi);

    ~QNullCommandBuffer();

    void destroy() override;

};

struct QNullSwapChain : public QRhiSwapChain

{

    QNullSwapChain(QRhiImplementation *rhi);

    ~QNullSwapChain();

    void destroy() override;

    QRhiCommandBuffer *currentFrameCommandBuffer() override;

    QRhiRenderTarget *currentFrameRenderTarget() override;

    QSize surfacePixelSize() override;

    bool isFormatSupported(Format f) override;

    QRhiRenderPassDescriptor *newCompatibleRenderPassDescriptor() override;

    bool createOrResize() override;

    QWindow *window = nullptr;

    QNullSwapChainRenderTarget rt;

    QNullCommandBuffer cb;

    int frameCount = 0;

};

class QRhiNull : public QRhiImplementation

{

public:

    QRhiNull(QRhiNullInitParams *params);

    bool create(QRhi::Flags flags) override;

    void destroy() override;

    QRhiGraphicsPipeline *createGraphicsPipeline() override;

    QRhiComputePipeline *createComputePipeline() override;

    QRhiShaderResourceBindings *createShaderResourceBindings() override;

    QRhiBuffer *createBuffer(QRhiBuffer::Type type,

                             QRhiBuffer::UsageFlags usage,

                             quint32 size) override;

    QRhiRenderBuffer *createRenderBuffer(QRhiRenderBuffer::Type type,

                                         const QSize &pixelSize,

                                         int sampleCount,

                                         QRhiRenderBuffer::Flags flags,

                                         QRhiTexture::Format backingFormatHint) override;

    QRhiTexture *createTexture(QRhiTexture::Format format,

                               const QSize &pixelSize,

                               int depth,

                               int arraySize,

                               int sampleCount,

                               QRhiTexture::Flags flags) override;

    QRhiSampler *createSampler(QRhiSampler::Filter magFilter,

                               QRhiSampler::Filter minFilter,

                               QRhiSampler::Filter mipmapMode,

                               QRhiSampler:: AddressMode u,

                               QRhiSampler::AddressMode v,

                               QRhiSampler::AddressMode w) override;

    QRhiTextureRenderTarget *createTextureRenderTarget(const QRhiTextureRenderTargetDescription &desc,

                                                       QRhiTextureRenderTarget::Flags flags) override;

    QRhiShadingRateMap *createShadingRateMap() override;

    QRhiSwapChain *createSwapChain() override;

    QRhi::FrameOpResult beginFrame(QRhiSwapChain *swapChain, QRhi::BeginFrameFlags flags) override;

    QRhi::FrameOpResult endFrame(QRhiSwapChain *swapChain, QRhi::EndFrameFlags flags) override;

    QRhi::FrameOpResult beginOffscreenFrame(QRhiCommandBuffer **cb, QRhi::BeginFrameFlags flags) override;

    QRhi::FrameOpResult endOffscreenFrame(QRhi::EndFrameFlags flags) override;

    QRhi::FrameOpResult finish() override;

    void resourceUpdate(QRhiCommandBuffer *cb, QRhiResourceUpdateBatch *resourceUpdates) override;

    void beginPass(QRhiCommandBuffer *cb,

                   QRhiRenderTarget *rt,

                   const QColor &colorClearValue,

                   const QRhiDepthStencilClearValue &depthStencilClearValue,

                   QRhiResourceUpdateBatch *resourceUpdates,

                   QRhiCommandBuffer::BeginPassFlags flags) override;

    void endPass(QRhiCommandBuffer *cb, QRhiResourceUpdateBatch *resourceUpdates) override;

    void setGraphicsPipeline(QRhiCommandBuffer *cb,

                             QRhiGraphicsPipeline *ps) override;

    void setShaderResources(QRhiCommandBuffer *cb,

                            QRhiShaderResourceBindings *srb,

                            int dynamicOffsetCount,

                            const QRhiCommandBuffer::DynamicOffset *dynamicOffsets) override;

    void setVertexInput(QRhiCommandBuffer *cb,

                        int startBinding, int bindingCount, const QRhiCommandBuffer::VertexInput *bindings,

                        QRhiBuffer *indexBuf, quint32 indexOffset,

                        QRhiCommandBuffer::IndexFormat indexFormat) override;

    void setViewport(QRhiCommandBuffer *cb, const QRhiViewport &viewport) override;

    void setScissor(QRhiCommandBuffer *cb, const QRhiScissor &scissor) override;

    void setBlendConstants(QRhiCommandBuffer *cb, const QColor &c) override;

    void setStencilRef(QRhiCommandBuffer *cb, quint32 refValue) override;

    void setShadingRate(QRhiCommandBuffer *cb, const QSize &coarsePixelSize) override;

    void draw(QRhiCommandBuffer *cb, quint32 vertexCount,

              quint32 instanceCount, quint32 firstVertex, quint32 firstInstance) override;

    void drawIndexed(QRhiCommandBuffer *cb, quint32 indexCount,

                     quint32 instanceCount, quint32 firstIndex,

                     qint32 vertexOffset, quint32 firstInstance) override;

    void debugMarkBegin(QRhiCommandBuffer *cb, const QByteArray &name) override;

    void debugMarkEnd(QRhiCommandBuffer *cb) override;

    void debugMarkMsg(QRhiCommandBuffer *cb, const QByteArray &msg) override;

    void beginComputePass(QRhiCommandBuffer *cb,

                          QRhiResourceUpdateBatch *resourceUpdates,

                          QRhiCommandBuffer::BeginPassFlags flags) override;

    void endComputePass(QRhiCommandBuffer *cb, QRhiResourceUpdateBatch *resourceUpdates) override;

    void setComputePipeline(QRhiCommandBuffer *cb, QRhiComputePipeline *ps) override;

    void dispatch(QRhiCommandBuffer *cb, int x, int y, int z) override;

    const QRhiNativeHandles *nativeHandles(QRhiCommandBuffer *cb) override;

    void beginExternal(QRhiCommandBuffer *cb) override;

    void endExternal(QRhiCommandBuffer *cb) override;

    double lastCompletedGpuTime(QRhiCommandBuffer *cb) override;

    QList<int> supportedSampleCounts() const override;

    QList<QSize> supportedShadingRates(int sampleCount) const override;

    int ubufAlignment() const override;

    bool isYUpInFramebuffer() const override;

    bool isYUpInNDC() const override;

    bool isClipDepthZeroToOne() const override;

    QMatrix4x4 clipSpaceCorrMatrix() const override;

    bool isTextureFormatSupported(QRhiTexture::Format format, QRhiTexture::Flags flags) const override;

    bool isFeatureSupported(QRhi::Feature feature) const override;

    int resourceLimit(QRhi::ResourceLimit limit) const override;

    const QRhiNativeHandles *nativeHandles() override;

    QRhiDriverInfo driverInfo() const override;

    QRhiStats statistics() override;

    bool makeThreadLocalNativeContextCurrent() override;

    void setQueueSubmitParams(QRhiNativeHandles *params) override;

    void releaseCachedResources() override;

    bool isDeviceLost() const override;

    QByteArray pipelineCacheData() override;

    void setPipelineCacheData(const QByteArray &data) override;

    void simulateTextureUpload(const QRhiResourceUpdateBatchPrivate::TextureOp &u);

    void simulateTextureCopy(const QRhiResourceUpdateBatchPrivate::TextureOp &u);

    void simulateTextureGenMips(const QRhiResourceUpdateBatchPrivate::TextureOp &u);

    QRhiNullNativeHandles nativeHandlesStruct;

    QRhiSwapChain *currentSwapChain = nullptr;

    QNullCommandBuffer offscreenCommandBuffer;

};

QT_END_NAMESPACE

#endif