axmol/cocos/base/CCProtocols.h

/****************************************************************************
Copyright (c) 2008-2010 Ricardo Quesada
Copyright (c) 2010-2012 cocos2d-x.org
Copyright (c) 2013-2016 Chukong Technologies Inc.
Copyright (c) 2017-2018 Xiamen Yaji Software Co., Ltd.

http://www.cocos2d-x.org

Permission is hereby granted, free of charge, to any person obtaining a copy
of this software and associated documentation files (the "Software"), to deal
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all copies or substantial portions of the Software.

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****************************************************************************/

#ifndef __BASE_CCPROTOCOLS_H__
#define __BASE_CCPROTOCOLS_H__
/// @cond DO_NOT_SHOW

#include <string>

#include "base/ccTypes.h"
#include "renderer/CCTexture2D.h"

NS_CC_BEGIN

/**
 * RGBA protocol that affects Node's color and opacity
 */
class CC_DLL __RGBAProtocol
{
public:
    virtual ~__RGBAProtocol() {}
    
    /**
     * Changes the color with R,G,B bytes
     *
     * @param color Example: Color3B(255,100,0) means R=255, G=100, B=0
     * @js NA
     * @lua NA
     */
    virtual void setColor(const Color3B& color) = 0;
    
    /**
     * Returns color that is currently used.
     *
     * @return The Color3B contains R,G,B bytes.
     * @js NA
     * @lua NA
     */
    virtual const Color3B& getColor() const = 0;
    
    /**
     * Returns the displayed color.
     *
     * @return The Color3B contains R,G,B bytes.
     * @js NA
     * @lua NA
     */
    virtual const Color3B& getDisplayedColor() const = 0;
    
    /**
     * Returns the displayed opacity.
     *
     * @return  The opacity of sprite, from 0 ~ 255
     * @js NA
     * @lua NA
     */
    virtual unsigned char getDisplayedOpacity() const = 0;
    /**
     * Returns the opacity.
     *
     * The opacity which indicates how transparent or opaque this node is.
     * 0 indicates fully transparent and 255 is fully opaque.
     *
     * @return  The opacity of sprite, from 0 ~ 255
     * @js NA
     * @lua NA
     */
    virtual unsigned char getOpacity() const = 0;
    
    /**
     * Changes the opacity.
     *
     * @param opacity   Goes from 0 to 255, where 255 means fully opaque and 0 means fully transparent.
     * @js NA
     * @lua NA
     */
    virtual void setOpacity(unsigned char opacity) = 0;
    
    // optional
    
    /**
     * Changes the OpacityModifyRGB property.
     * If this property is set to true, then the rendered color will be affected by opacity.
     * Normally, r = r * opacity/255, g = g * opacity/255, b = b * opacity/255.
     *
     * @param value If true, then the opacity will be applied as: glColor(R,G,B,opacity);
     *              If false, then the opacity will be applied as: glColor(opacity, opacity, opacity, opacity);
     * @js NA
     * @lua NA
     */
    virtual void setOpacityModifyRGB(bool value) = 0;
    
    /**
     * Returns whether or not the opacity will be applied using glColor(R,G,B,opacity)
     * or glColor(opacity, opacity, opacity, opacity)
     *
     * @return  Returns opacity modify flag.
     * @js NA
     * @lua NA
     */
    virtual bool isOpacityModifyRGB() const = 0;
    
    /**
     *  whether or not color should be propagated to its children.
     * @js NA
     * @lua NA
     */
    virtual bool isCascadeColorEnabled() const = 0;
    /**
     * @js NA
     * @lua NA
     */
    virtual void setCascadeColorEnabled(bool cascadeColorEnabled) = 0;
    
    /**
     *  recursive method that updates display color
     * @js NA
     * @lua NA
     */
    virtual void updateDisplayedColor(const Color3B& color) = 0;
    
    /**
     *  whether or not opacity should be propagated to its children.
     * @js NA
     * @lua NA
     */
    virtual bool isCascadeOpacityEnabled() const = 0;
    /**
     * @js NA
     * @lua NA
     */
    virtual void setCascadeOpacityEnabled(bool cascadeOpacityEnabled) = 0;
    
    /**
     *  recursive method that updates the displayed opacity.
     * @js NA
     * @lua NA
     */
    virtual void updateDisplayedOpacity(unsigned char opacity) = 0;
};

/**
 * Specify the blending function according glBlendFunc
 * Please refer to glBlendFunc in OpenGL ES Manual
 * http://www.khronos.org/opengles/sdk/docs/man/xhtml/glBlendFunc.xml for more details.
 */
class CC_DLL BlendProtocol
{
public:
    virtual ~BlendProtocol() {}

    /**
     * Sets the source blending function.
     *
     * @param blendFunc A structure with source and destination factor to specify pixel arithmetic, 
     *                  e.g. {BlendFactor::ONE, BlendFactor::ONE}, {BlendFactor::SRC_ALPHA, BlendFactor::ONE_MINUS_SRC_ALPHA}.
     * @js NA
     * @lua NA
     */
    virtual void setBlendFunc(const BlendFunc &blendFunc) = 0;

    /**
     * Returns the blending function that is currently being used.
     * 
     * @return A BlendFunc structure with source and destination factor which specified pixel arithmetic.
     * @js NA
     * @lua NA
     */
    virtual const BlendFunc &getBlendFunc() const = 0;
};

/** 
 * Node objects that uses a Texture2D to render the images.
 * The texture can have a blending function.
 * If the texture has alpha premultiplied the default blending function is:
 *   src=BlendFactor::ONE dst= BlendFactor::ONE_MINUS_SRC_ALPHA
 * else
 *   src=BlendFactor::SRC_ALPHA dst= BlendFactor::ONE_MINUS_SRC_ALPHA
 * But you can change the blending function at any time.
 */
class CC_DLL TextureProtocol : public BlendProtocol
{
public:
    virtual ~TextureProtocol() {}
    /**
     * Returns the currently used texture
     *
     * @return  The texture that is currently being used.
     * @js NA
     * @lua NA
     */
    virtual Texture2D* getTexture() const = 0;

    /**
     * Sets a new texture. It will be retained.
     *
     * @param   texture A valid Texture2D object, which will be applied to this sprite object.
     * @js NA
     * @lua NA
     */
    virtual void setTexture(Texture2D *texture) = 0;
};

/**
 * Common interface for Labels
 */
class CC_DLL LabelProtocol
{
public:
    virtual ~LabelProtocol() {}

    /**
     * Sets a new label using a string
     *
     * @param label The name of the new label.
     * @js NA
     * @lua NA
     */
    virtual void setString(std::string_view label) = 0;

    /** 
     * Returns the string that is currently being used in this label 
     *
     * @return The string that is currently being used in this label
     * @js NA
     * @lua NA
     */
    virtual const std::string& getString() const = 0;
};

/** 
 * OpenGL projection protocol 
 */
class CC_DLL DirectorDelegate
{
public:
    virtual ~DirectorDelegate() {}

    /**
     * Will be called by Director when the projection is updated, and "custom" projection is used
     * @js NA
     * @lua NA
     */
    virtual void updateProjection() = 0;
};

/**
 * interface for playable items
 */
class CC_DLL PlayableProtocol
{
public:
    virtual ~PlayableProtocol(){}
    
    virtual void start() = 0;
    
    virtual void stop() = 0;
};
NS_CC_END

/// @endcond
#endif // __BASE_CCPROTOCOLS_H__