axmol/cocos2dx/include/CCProtocols.h

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Copyright (c) 2010-2012 cocos2d-x.org
Copyright (c) 2008-2010 Ricardo Quesada

http://www.cocos2d-x.org

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#ifndef __CCPROTOCOLS_H__
#define __CCPROTOCOLS_H__

#include "ccTypes.h"
#include "textures/CCTexture2D.h"
#include <string>

NS_CC_BEGIN

/**
 * RGBA protocol that affects CCNode's color and opacity
 */
class CC_DLL CCRGBAProtocol
{
public:
    /** 
     * Changes the color with R,G,B bytes
     *
     * @param color Example: ccc3(255,100,0) means R=255, G=100, B=0
     */
    virtual void setColor(const ccColor3B& color) = 0;

    /**
     * Returns color that is currently used.
     *
     * @return The ccColor3B contains R,G,B bytes.
     */
    virtual const ccColor3B& getColor(void) = 0;

    /**
     * Returns the opacity.
     *
     * The opacity which indicates how transparent or opaque this sprite is.
     * 0 indicates fully transparent and 255 is fully opaque.
     *
     * @return  The opacity of sprite, from 0 ~ 255
     */
    virtual GLubyte getOpacity(void) = 0;

    /**
     * Changes the opacity.
     *
     * @warning If the the sprite's texture has premultiplied alpha then, the R, G and B channels will be modified.
     *
     * @param   value   Goes from 0 to 255, where 255 means fully opaque and 0 means fully transparent.
     */
    virtual void setOpacity(GLubyte opacity) = 0;

    // optional

    /**
     * Changes the premultipliedAlphaOpacity property.
     *
     * Textures with premultiplied alpha will have this property by default on YES.
     * Otherwise the default value is NO.
     *
     * @param   bValue  If set to NO then opacity will be applied as: glColor(R,G,B,opacity);
     *                  If set to YES then opacity will be applied as: glColor(opacity, opacity, opacity, opacity);
     */
    virtual void setOpacityModifyRGB(bool bValue) = 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.
     */
    virtual bool isOpacityModifyRGB(void) = 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 CCBlendProtocol
{
public:
    /**
     * Sets the source blending function for the texture.
     *
     * @param blendFunc A structure with source and destination factor to specify pixel arithmetic, 
     *                  e.g. {GL_ONE, GL_ONE}, {GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA}.
     *
     */
    virtual void setBlendFunc(ccBlendFunc blendFunc) = 0;

    /**
     * Returns the blending function that is currently being used for the texture.
     * 
     * @return A ccBlendFunc structure with source and destination factor which specified pixel arithmetic.
     */
    virtual ccBlendFunc getBlendFunc(void) = 0;
};

/** 
 * CCNode 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=GL_ONE dst= GL_ONE_MINUS_SRC_ALPHA
 * else
 *   src=GL_SRC_ALPHA dst= GL_ONE_MINUS_SRC_ALPHA
 * But you can change the blending function at any time.
 */
class CC_DLL CCTextureProtocol : public CCBlendProtocol
{
public:
    /**
     * Returns the currently used texture
     *
     * @return  The texture that is currenlty being used.
     */
    virtual CCTexture2D* getTexture(void) = 0;

    /**
     * Sets a new texuture. It will be retained.
     *
     * @param   texture A valid CCTexture2D object, which will be applied to this sprite object.
     */
    virtual void setTexture(CCTexture2D *texture) = 0;
};

/**
 * Common interface for Labels
 */
class CC_DLL CCLabelProtocol
{
public:
    /**
     * Sets a new label using an string
     *
     * @param A null terminated string 
     */
    virtual void setString(const char *label) = 0;

    /** 
     * Returns the string that is currently being used in this label 
     *
     * @return The string that is currently being used in this label
     */
    virtual const char* getString(void) = 0;
};

/** 
 * OpenGL projection protocol 
 */
class CC_DLL CCDirectorDelegate
{
public:
    /** 
     * Will be called by CCDirector when the projection is updated, and "custom" projection is used
     */
    virtual void updateProjection(void) = 0;
};

NS_CC_END

#endif // __CCPROTOCOLS_H__