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// Copyright (C) 2019 The Qt Company Ltd.

// SPDX-License-Identifier: LicenseRef-Qt-Commercial OR GPL-3.0-only

// Qt-Security score:significant reason:default

#ifndef QSSGRHICONTEXT_H

#define QSSGRHICONTEXT_H

//

//  W A R N I N G

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

//

// This file is part of the QtQuick3D API, with limited compatibility guarantees.

// Usage of this API may make your code source and binary incompatible with

// future versions of Qt.

//

#include <QtCore/qstack.h>

#include <rhi/qrhi.h>

#include <QtQuick3DRuntimeRender/qtquick3druntimerenderexports.h>

QT_BEGIN_NAMESPACE

class QSSGRhiContextPrivate;

class QSSGRhiShaderPipeline;

class QSSGRhiGraphicsPipelineState

public:

    enum class Flag : quint32

        DepthTestEnabled  = 0x1,

        DepthWriteEnabled = 0x2,

        BlendEnabled = 0x4,

        UsesStencilRef = 0x8,

        UsesScissor = 0x10

};

    Q_DECLARE_FLAGS(Flags, Flag)

    QRhiGraphicsPipeline::CompareOp depthFunc = QRhiGraphicsPipeline::LessOrEqual;

    QRhiGraphicsPipeline::CullMode cullMode = QRhiGraphicsPipeline::None;

    std::array<QRhiGraphicsPipeline::TargetBlend, 8> targetBlend;

    QRhiGraphicsPipeline::PolygonMode polygonMode = QRhiGraphicsPipeline::Fill;

    QRhiGraphicsPipeline::StencilOpState stencilOpFrontState {};

    quint32 stencilWriteMask = 0xFF;

    quint32 stencilRef = 0;

    int depthBias = 0;

    int samples = 1;

    int colorAttachmentCount = 1;

    int viewCount = 1;

    float slopeScaledDepthBias = 0.0f;

    float lineWidth = 1.0f;

    Flags flags;

    QRhiViewport viewport;

    QRhiScissor scissor;

    bool userSetCullMode = false; // set by PipelineStateOverride; not part of the pipeline cache key

private:

    friend struct QSSGRhiGraphicsPipelineStatePrivate;

    friend struct QSSGRhiInputAssemblerStatePrivate;

    struct InputAssemblerState

        enum InputSemantic {

            PositionSemantic,           // attr_pos

            NormalSemantic,             // attr_norm

            TexCoord0Semantic,          // attr_uv0

            TexCoord1Semantic,          // attr_uv1

            TangentSemantic,            // attr_textan

            BinormalSemantic,           // attr_binormal

            ColorSemantic,              // attr_color

            MaxTargetSemantic = ColorSemantic,

            JointSemantic,              // attr_joints

            WeightSemantic,             // attr_weights

            TexCoordLightmapSemantic    // attr_lightmapuv

};

        QRhiVertexInputLayout inputLayout;

        QVarLengthArray<InputSemantic, 8> inputs;

        QRhiGraphicsPipeline::Topology topology;

        std::array<quint8, MaxTargetSemantic + 1> targetOffsets = { UINT8_MAX, UINT8_MAX, UINT8_MAX, UINT8_MAX,

                                                                    UINT8_MAX, UINT8_MAX, UINT8_MAX };

        quint8 targetCount = 0;

    } ia;

    // for internal use

    const QSSGRhiShaderPipeline *shaderPipeline = nullptr;

};

struct QSSGRhiSamplerDescription

    QRhiSampler::Filter minFilter;

    QRhiSampler::Filter magFilter;

    QRhiSampler::Filter mipmap;

    QRhiSampler::AddressMode hTiling;

    QRhiSampler::AddressMode vTiling;

    QRhiSampler::AddressMode zTiling;

};

class Q_QUICK3DRUNTIMERENDER_EXPORT QSSGRhiContext

    Q_DISABLE_COPY(QSSGRhiContext)

public:

    explicit QSSGRhiContext(QRhi *rhi);

    ~QSSGRhiContext();

    QRhi *rhi() const;

    bool isValid() const;

    QRhiRenderPassDescriptor *mainRenderPassDescriptor() const;

    QRhiCommandBuffer *commandBuffer() const;

    QRhiRenderTarget *renderTarget() const;

    int mainPassSampleCount() const;

    int mainPassViewCount() const;

    QRhiSampler *sampler(const QSSGRhiSamplerDescription &samplerDescription);

    void checkAndAdjustForNPoT(QRhiTexture *texture, QSSGRhiSamplerDescription *samplerDescription);

    QRhiTexture *dummyTexture(QRhiTexture::Flags flags, QRhiResourceUpdateBatch *rub,

                              const QSize &size = QSize(64, 64), const QColor &fillColor = Qt::black,

                              int arraySize = 0);

    QRhiCommandBuffer::BeginPassFlags commonPassFlags() const;

private:

    Q_DECLARE_PRIVATE(QSSGRhiContext)

    std::unique_ptr<QSSGRhiContextPrivate> d_ptr;

};

QT_END_NAMESPACE

#endif