[cocos2dx]2.x中精灵变灰的shader(c++)

之前精灵变灰都用的是别人写的一个GraySprite,实在是有很多局限

后来有个需求是要让CCControlButton在不传disable状态图片的时候,自动把normal的图片变灰

查阅多方资料后,终于把问题搞定

在cocos2dx/shaders目录下新建一个ccShader_PositionTextureGray_frag.h

#ifndef cocos2dx_ccShader_PositionTextureGray_frag_h
#define cocos2dx_ccShader_PositionTextureGray_frag_h
"                                           n
#ifdef GL_ES                                n
precision mediump float;                    n
#endif                                      n
n
uniform sampler2D u_texture;                n
varying vec2 v_texCoord;                    n
varying vec4 v_fragmentColor;               n
n
void main(void)                             n
{                                           n
// Convert to greyscale using NTSC weightings               n
vec4 col = texture2D(u_texture, v_texCoord);                n
float grey = dot(col.rgb, vec3(0.299, 0.587, 0.114));       n
gl_FragColor = vec4(grey, grey, grey, col.a);               n
}                                           n
";

#endif

#ifndef cocos2dx_ccShader_PositionTextureGray_frag_h

#define cocos2dx_ccShader_PositionTextureGray_frag_h

" n

#ifdef GL_ES n

precision mediump float; n

#endif n

uniform sampler2D u_texture; n

varying vec2 v_texCoord; n

varying vec4 v_fragmentColor; n

void main(void) n

{ n

// Convert to greyscale using NTSC weightings n

vec4 col = texture2D(u_texture, v_texCoord); n

float grey = dot(col.rgb, vec3(0.299, 0.587, 0.114)); n

gl_FragColor = vec4(grey, grey, grey, col.a); n

} n

#endif

找到ccShaders.h,在最后加上

C++

extern CC_DLL const GLchar * ccPositionTextureGray_frag;

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extern CC_DLL const GLchar * ccPositionTextureGray_frag;
找到ccShaders.cpp,在最后加上

C++

const GLchar * ccPositionTextureGray_frag = #include "ccShader_PositionTextureGray_frag.h"

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const GLchar * ccPositionTextureGray_frag =
#include "ccShader_PositionTextureGray_frag.h"
找到CCGLProgram.h在enum后面的define后加上

C++

#define kCCShader_PositionTextureGray "ShaderPositionTextureGray"

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#define kCCShader_PositionTextureGray "ShaderPositionTextureGray"

找到CCShaderCache.cpp,在开头enum的最后加上kCCShaderType_PositionTextureGray

enum {
    kCCShaderType_PositionTextureColor,
    kCCShaderType_PositionTextureColorAlphaTest,
    kCCShaderType_PositionColor,
    kCCShaderType_PositionTexture,
    kCCShaderType_PositionTexture_uColor,
    kCCShaderType_PositionTextureA8Color,
    kCCShaderType_Position_uColor,
    kCCShaderType_PositionLengthTexureColor,
    kCCShaderType_PositionTextureGray,//add this

    kCCShaderType_MAX,
};

enum {

kCCShaderType_PositionTextureColor,

kCCShaderType_PositionTextureColorAlphaTest,

kCCShaderType_PositionColor,

kCCShaderType_PositionTexture,

kCCShaderType_PositionTexture_uColor,

kCCShaderType_PositionTextureA8Color,

kCCShaderType_Position_uColor,

kCCShaderType_PositionLengthTexureColor,

kCCShaderType_PositionTextureGray,//add this

kCCShaderType_MAX,

};

继续在CCShaderCache.cpp的loadDefaultShaders()最后添加

//
// Position Texture Gray shader
//
p = new CCGLProgram();
loadDefaultShader(p, kCCShaderType_PositionTextureGray);

m_pPrograms->setObject(p, kCCShader_PositionTextureGray);
p->release();

// Position Texture Gray shader

p = new CCGLProgram();

loadDefaultShader(p, kCCShaderType_PositionTextureGray);

m_pPrograms->setObject(p, kCCShader_PositionTextureGray);

p->release();

继续在CCShaderCache.cpp的reloadDefaultShaders()最后添加

C++

// Position Texture Gray shader p = programForKey(kCCShader_PositionTextureGray); p->reset(); loadDefaultShader(p, kCCShaderType_PositionTextureGray);

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// Position Texture Gray shader
p = programForKey(kCCShader_PositionTextureGray);
p->reset();
loadDefaultShader(p, kCCShaderType_PositionTextureGray);

继续在CCShaderCache.cpp的loadDefaultShader(CCGLProgram *p, int type)最后添加一个case条件

case kCCShaderType_PositionTextureGray:
    p->initWithVertexShaderByteArray(ccPositionTextureColor_vert, ccPositionTextureGray_frag);
    
    p->addAttribute(kCCAttributeNamePosition, kCCVertexAttrib_Position);
    p->addAttribute(kCCAttributeNameColor, kCCVertexAttrib_Color);
    p->addAttribute(kCCAttributeNameTexCoord, kCCVertexAttrib_TexCoords);
    
    break;

case kCCShaderType_PositionTextureGray:

p->initWithVertexShaderByteArray(ccPositionTextureColor_vert, ccPositionTextureGray_frag);

p->addAttribute(kCCAttributeNamePosition, kCCVertexAttrib_Position);

p->addAttribute(kCCAttributeNameColor, kCCVertexAttrib_Color);

p->addAttribute(kCCAttributeNameTexCoord, kCCVertexAttrib_TexCoords);

break;

新建一个ColorUtils.h

#ifndef __COLOR_UTILS_H__
#define __COLOR_UTILS_H__

#include "cocos2d.h"
USING_NS_CC;

class ColorUtils
{
public:
    ColorUtils();
    ~ColorUtils();
    
    static void addGray(CCSprite *sp);
    static void removeGray(CCSprite *sp);
    
    static void addGray(CCSpriteBatchNode *sp);
    static void removeGray(CCSpriteBatchNode *sp);
    
private:
    
};

#endif

#ifndef __COLOR_UTILS_H__

#define __COLOR_UTILS_H__

#include "cocos2d.h"

USING_NS_CC;

class ColorUtils

{

public:

ColorUtils();

~ColorUtils();

static void addGray(CCSprite *sp);

static void removeGray(CCSprite *sp);

static void addGray(CCSpriteBatchNode *sp);

static void removeGray(CCSpriteBatchNode *sp);

private:

};

#endif

新建一个ColorUtils.cpp

#include "ColorUtils.h"

ColorUtils::ColorUtils()
{
}

ColorUtils::~ColorUtils()
{
}

void ColorUtils::addGray(CCSprite* sp)
{
    do
    {
        CCGLProgram* pProgram = CCShaderCache::sharedShaderCache()->programForKey(kCCShader_PositionTextureGray);
        sp->setShaderProgram(pProgram);
        CHECK_GL_ERROR_DEBUG();
    } while (0);
}
void ColorUtils::removeGray(CCSprite* sp)
{
    do
    {
        CCGLProgram* pProgram = CCShaderCache::sharedShaderCache()->programForKey(kCCShader_PositionTextureColor);
        sp->setShaderProgram(pProgram);
        CHECK_GL_ERROR_DEBUG();
    } while (0);
}
void ColorUtils::addGray(CCSpriteBatchNode* sp)
{
    do
    {
        CCGLProgram* pProgram = CCShaderCache::sharedShaderCache()->programForKey(kCCShader_PositionTextureGray);
        sp->setShaderProgram(pProgram);
        CHECK_GL_ERROR_DEBUG();
    } while (0);
}
void ColorUtils::removeGray(CCSpriteBatchNode* sp)
{
    do
    {
        CCGLProgram* pProgram = CCShaderCache::sharedShaderCache()->programForKey(kCCShader_PositionTextureColor);
        sp->setShaderProgram(pProgram);
        CHECK_GL_ERROR_DEBUG();
    } while (0);
}

#include "ColorUtils.h"

ColorUtils::ColorUtils()

{

}

ColorUtils::~ColorUtils()

{

}

void ColorUtils::addGray(CCSprite* sp)

{

CCGLProgram* pProgram = CCShaderCache::sharedShaderCache()->programForKey(kCCShader_PositionTextureGray);

sp->setShaderProgram(pProgram);

CHECK_GL_ERROR_DEBUG();

} while (0);

}

void ColorUtils::removeGray(CCSprite* sp)

{

CCGLProgram* pProgram = CCShaderCache::sharedShaderCache()->programForKey(kCCShader_PositionTextureColor);

sp->setShaderProgram(pProgram);

CHECK_GL_ERROR_DEBUG();

} while (0);

}

void ColorUtils::addGray(CCSpriteBatchNode* sp)

{

CCGLProgram* pProgram = CCShaderCache::sharedShaderCache()->programForKey(kCCShader_PositionTextureGray);

sp->setShaderProgram(pProgram);

CHECK_GL_ERROR_DEBUG();

} while (0);

}

void ColorUtils::removeGray(CCSpriteBatchNode* sp)

{

CCGLProgram* pProgram = CCShaderCache::sharedShaderCache()->programForKey(kCCShader_PositionTextureColor);

sp->setShaderProgram(pProgram);

CHECK_GL_ERROR_DEBUG();

} while (0);

}

使用
对于CCSprite

C++

CCSprite *sp = CCSprite::create("demo.png"); ColorUtils::addGray(sp);

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CCSprite *sp = CCSprite::create("demo.png");
ColorUtils::addGray(sp);

对于CCScale9Sprite

C++

CCSpriteBatchNode *sp = (CCSpriteBatchNode*)scale9sprite->getChildren()->objectAtIndex(0); ColorUtils::addGray(sp);

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CCSpriteBatchNode *sp = (CCSpriteBatchNode*)scale9sprite->getChildren()->objectAtIndex(0);
ColorUtils::addGray(sp);

remove亦然

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[cocos2dx]2.x中精灵变灰的shader(c++)

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