axmol/core/3d/CCMotionStreak3D.h

/****************************************************************************
 Copyright (c) 2015-2016 Chukong Technologies Inc.
 Copyright (c) 2017-2018 Xiamen Yaji Software Co., Ltd.

 https://axis-project.github.io/

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#ifndef __CC_MOTION_STREAK3D_H__
#define __CC_MOTION_STREAK3D_H__

#include "base/CCProtocols.h"
#include "2d/CCNode.h"
#include "renderer/CCCustomCommand.h"
#include "renderer/CCCallbackCommand.h"

#include <vector>

NS_AX_BEGIN

class Texture2D;

/**
 * @addtogroup _3d
 * @{
 */

/** @class MotionStreak3D.
 * @brief Creates a trailing path. It is created from a line segment sweeping along the path.
 */
class CC_DLL MotionStreak3D : public Node, public TextureProtocol
{
public:
    /** Creates and initializes a motion streak with fade in seconds, minimum segments, stroke's width, color, texture
     * filename.
     *
     * @param fade The fade time, in seconds.
     * @param minSeg The minimum segments.
     * @param stroke The width of stroke.
     * @param color The color of stroke.
     * @param path The texture file name of stoke.
     * @return An autoreleased MotionStreak3D object.
     */
    static MotionStreak3D* create(float fade, float minSeg, float stroke, const Color3B& color, std::string_view path);
    /** Creates and initializes a motion streak with fade in seconds, minimum segments, stroke's width, color, texture.
     *
     * @param fade The fade time, in seconds.
     * @param minSeg The minimum segments.
     * @param stroke The width of stroke.
     * @param color The color of stroke.
     * @param texture The texture name of stoke.
     * @return An autoreleased MotionStreak3D object.
     */
    static MotionStreak3D* create(float fade, float minSeg, float stroke, const Color3B& color, Texture2D* texture);

    /** Color used for the tint.
     *
     * @param colors The color used for the tint.
     */
    void tintWithColor(const Color3B& colors);

    /** Remove all living segments of the ribbon.
     */
    void reset();

    /** Get stroke.
     *
     * @return float stroke.
     */
    float getStroke() const { return _stroke; }
    /** Set stroke.
     *
     * @param stroke The width of stroke.
     */
    void setStroke(float stroke) { _stroke = stroke; }

    /** Is the starting position initialized or not.
     *
     * @return True if the starting position is initialized.
     */
    bool isStartingPositionInitialized() const { return _startingPositionInitialized; }
    /** Sets the starting position initialized or not.
     *
     * @param bStartingPositionInitialized True if initialized the starting position.
     */
    void setStartingPositionInitialized(bool bStartingPositionInitialized)
    {
        _startingPositionInitialized = bStartingPositionInitialized;
    }

    // Overrides
    virtual void setPosition(const Vec2& position) override;
    virtual void setPosition(float x, float y) override;
    virtual void setPosition3D(const Vec3& position) override;
    virtual void setRotation3D(const Vec3& rotation) override;
    virtual void setRotationQuat(const Quaternion& quat) override;

    virtual const Vec2& getPosition() const override;
    virtual void getPosition(float* x, float* y) const override;
    virtual void setPositionX(float x) override;
    virtual void setPositionY(float y) override;
    virtual float getPositionX() const override;
    virtual float getPositionY() const override;
    virtual Vec3 getPosition3D() const override;
    /**
     * @js NA
     * @lua NA
     */
    virtual void draw(Renderer* renderer, const Mat4& transform, uint32_t flags) override;
    /**
     * @lua NA
     */
    virtual void update(float delta) override;
    virtual Texture2D* getTexture() const override;
    virtual void setTexture(Texture2D* texture) override;
    /**
     * @js NA
     * @lua NA
     */
    virtual void setBlendFunc(const BlendFunc& blendFunc) override;
    /**
     * @js NA
     * @lua NA
     */
    virtual const BlendFunc& getBlendFunc() const override;
    virtual uint8_t getOpacity() const override;
    virtual void setOpacity(uint8_t opacity) override;
    virtual void setOpacityModifyRGB(bool value) override;
    virtual bool isOpacityModifyRGB() const override;

    /**
     * Set the direction of sweeping line segment.
     * @param sweepAxis Direction of sweeping line segment
     */
    void setSweepAxis(const Vec3& sweepAxis) { _sweepAxis = sweepAxis.getNormalized(); }

    /**
     * Get the direction of sweeping line segment
     */
    const Vec3& getSweepAxis() const { return _sweepAxis; }

    MotionStreak3D();
    virtual ~MotionStreak3D();

    /** initializes a motion streak with fade in seconds, minimum segments, stroke's width, color and texture filename
     */
    bool initWithFade(float fade, float minSeg, float stroke, const Color3B& color, std::string_view path);

    /** initializes a motion streak with fade in seconds, minimum segments, stroke's width, color and texture  */
    bool initWithFade(float fade, float minSeg, float stroke, const Color3B& color, Texture2D* texture);

protected:
    // renderer callback

    void initCustomCommand();

    struct VertexData
    {
        Vec3 pos;
        Color4B color;
        Tex2F texPos;
    };

    bool _startingPositionInitialized;

    /** texture used for the motion streak */
    Texture2D* _texture;
    BlendFunc _blendFunc;
    Vec3 _positionR;
    mutable Vec2 _positionR2D;
    Vec3 _sweepAxis;

    float _stroke;
    float _fadeDelta;
    float _minSeg;

    unsigned int _maxPoints;
    unsigned int _nuPoints;
    unsigned int _previousNuPoints;

    /** Pointers */
    std::vector<Vec3> _pointVertexes;
    std::vector<float> _pointState;

    std::vector<VertexData> _vertexData;

    CustomCommand _customCommand;

private:
    CC_DISALLOW_COPY_AND_ASSIGN(MotionStreak3D);

    //CallbackCommand _beforeCommand;
    //CallbackCommand _afterCommand;
    backend::UniformLocation _locMVP;
    backend::UniformLocation _locTexture;

    void onBeforeDraw();
    void onAfterDraw();

    backend::CullMode _rendererCullface;
    bool _rendererDepthTest;
};

// end of _3d group
/// @}

NS_AX_END

#endif  //__CC_MOTION_STREAK3D_H__