cocos2d-x，Shader的用法：精灵变灰

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GL Shader脚本代码

gray.vsh

<pre name="code" class="cpp">attribute vec4 a_position;attribute vec2 a_texCoord;attribute vec4 a_color;varying vec4 v_fragmentColor;varying vec2 v_texCoord;void main(){    gl_Position = CC_PMatrix * a_position;v_fragmentColor = a_color;v_texCoord = a_texCoord;}

</pre><pre code_snippet_id="688699" snippet_file_name="blog_20150609_3_5918082" name="code" class="cpp">gray.fsh

#ifdef GL_ESprecision mediump float;#endifvarying vec4 v_fragmentColor;varying vec2 v_texCoord;void main(void){    vec4 c = texture2D(CC_Texture0, v_texCoord);    gl_FragColor.xyz = vec3(0.2126*c.r + 0.7152*c.g + 0.0722*c.b);    gl_FragColor.w = c.w;}

以上两文件copy到工程

使用

void CMovingObject::SetGraySprite(Sprite* sprite){    if(sprite)    {        GLProgram * p = new GLProgram();        p->initWithFilenames("gray.vsh", "gray.fsh");        p->bindAttribLocation(GLProgram::ATTRIBUTE_NAME_POSITION, GLProgram::VERTEX_ATTRIB_POSITION);        p->bindAttribLocation(GLProgram::ATTRIBUTE_NAME_COLOR, GLProgram::VERTEX_ATTRIB_COLOR);        p->bindAttribLocation(GLProgram::ATTRIBUTE_NAME_TEX_COORD, GLProgram::VERTEX_ATTRIB_TEX_COORDS);        p->link();        p->updateUniforms();        sprite->setGLProgram(p);        //恢复        //<span style="font-family: Arial, Helvetica, sans-serif;">sprite->setGLProgram(GLProgramCache::getInstance()->getGLProgram(GLProgram::SHADER_NAME_POSITION_TEXTURE_COLOR));</span>        //解决坐标错乱问题：gray.vsh 中的CC_MVPMatrix 改为 CC_PMatrix 即可        //解决报错问题：fsh中注释掉这句话//uniform sampler2D CC_Texture0;    }}

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