axmol/cocos/renderer/backend/DepthStencilState.h

/****************************************************************************
 Copyright (c) 2018-2019 Xiamen Yaji Software Co., Ltd.

 http://www.cocos2d-x.org

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#pragma once

#include "Macros.h"
#include "Types.h"

#include "base/CCRef.h"

CC_BACKEND_BEGIN

/**
 * @addtogroup _backend
 * @{
 */

/**
 * Stencil descriptor.
 */
struct StencilDescriptor
{
    bool operator ==(const StencilDescriptor& rhs) const;
    
    StencilOperation stencilFailureOperation = StencilOperation::KEEP;
    StencilOperation depthFailureOperation = StencilOperation::KEEP;
    StencilOperation depthStencilPassOperation = StencilOperation::KEEP;
    CompareFunction stencilCompareFunction = CompareFunction::ALWAYS;
    unsigned int readMask = 0;
    unsigned int writeMask = 0;
};

/**
 * Depth and stencil descriptor.
 */
struct DepthStencilDescriptor
{
    CompareFunction depthCompareFunction = CompareFunction::LESS;
    StencilDescriptor backFaceStencil;
    StencilDescriptor frontFaceStencil;
    bool depthWriteEnabled = false;
    TargetBufferFlags depthStencilFlags = {};

    void addFlag(TargetBufferFlags flag) { depthStencilFlags |= flag; }
    void removeFlag(TargetBufferFlags flag) { depthStencilFlags &= ~flag; }
};

/**
 * Store Depth and stencil status.
 */
class DepthStencilState : public cocos2d::Ref
{
public:
    virtual void update(const DepthStencilDescriptor& descriptor);
    const DepthStencilDescriptor& getDepthStencilInfo()const { return _depthStencilInfo; }
    bool isEnabled() const;
protected:
    /**
     * @param descriptor Specifies depth and stencil descriptor.
     */
    DepthStencilState() = default;
    virtual ~DepthStencilState();
    
    DepthStencilDescriptor _depthStencilInfo{}; ///< depth and stencil descriptor.
    bool _isBackFrontStencilEqual = false; ///< Does front stencil status equals to back stencil's.
};

// end of _backend group
/// @}
CC_BACKEND_END