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我创建了一个CCNode子类并使用我自己的opengles2.0代码覆盖了draw函数，但它在日志输出中总是有错误：“OpenGL error 0x0500 in -[CCSprite draw] 530”，更重要的是，当我添加子类时实例到场景，其他图层不会显示，函数中的Z顺序（addChild：child z：child.zOrder tag:child.tag）也不起作用。这是子类代码：（我使用默认的cocos2d模板创建了一个HelloWorld项目，添加了一个名为MyNode的CCNode子类，同时创建了两个shader）

//shaderf.glsl fragmentShader 
precision mediump float;
void main()
{
    gl_FragColor=vec4(0.0,0.0,1.0,1.0);
}



//shaderv.glsl  //vertexShader
attribute vec4 vPosition;
 void main(void)
 {
    gl_Position=vPosition;
 }

MyNode.h
@interface MyNode : CCNode {
    GLuint _programeHandle;
    GLuint _positionSlot;
}
@end

MyNode.m
@implementation MyNode
- (id) init {
    self = [super init];
    if (self) {
    }
    return self;
}
-(void)DrawOpengl
{
    NSString * vertexShaderPath=[[NSBundle mainBundle] pathForResource:@"shaderv" ofType:@"glsl"];
    NSString * fragmentShaderPath=[[NSBundle mainBundle]pathForResource:@"shaderf" ofType:@"glsl"];
    GLuint vertexShader=[ZZZGLESUtils loadShader:GL_VERTEX_SHADER withFilePath:vertexShaderPath];
    GLuint fragmentShader=[ZZZGLESUtils loadShader:GL_FRAGMENT_SHADER withFilePath:fragmentShaderPath];
    _programeHandle=glCreateProgram();
    if (!_programeHandle) {
        NSLog(@"failed to created programe");
        return;
    }
    glAttachShader(_programeHandle, vertexShader);
    glAttachShader(_programeHandle, fragmentShader);
    glLinkProgram(_programeHandle);
    GLint linked;
    glGetProgramiv(_programeHandle, GL_LINK_STATUS, &linked);
    if (!linked) {
        GLint infolen=0;
        glGetProgramiv(_programeHandle, GL_INFO_LOG_LENGTH, &infolen);
        if(infolen>1)
        {
            char * infomsg=malloc(sizeof(char)*infolen);
            glGetProgramInfoLog(_programeHandle, infolen, NULL, infomsg);
            NSLog(@"Link programe error is: \n%s\n",infomsg);
            free(infomsg);
        }
        glDeleteProgram(_programeHandle);
        _programeHandle=0;
        return;
    }
    glUseProgram(_programeHandle);
    _positionSlot=glGetAttribLocation(_programeHandle, "vPosition");
}
-(void)DrawTriCone
{
    float victex[]={ 0.5,0.5,0.0,
        0.5,-0.5,0.0,
        -0.5,-0.5,0.0,
        -0.5,0.5,0.0,
        0.0,0.0,-0.7,};
    GLubyte indicx[]={
        0,1,1,2,2,3,3,0,
        4,0,4,1,4,2,4,3,
    };
    glEnableVertexAttribArray(kCCVertexAttribFlag_Position);
    glVertexAttribPointer(_positionSlot, 3, GL_FLOAT, GL_FALSE, 0, victex);
    glEnableVertexAttribArray(_positionSlot);
    glDrawElements(GL_LINES, sizeof(indicx)/sizeof(GLubyte), GL_UNSIGNED_BYTE, indicx);
    glDisableVertexAttribArray(_positionSlot);
}
- (void) draw {
    glDisable(GL_TEXTURE_2D);
    ccGLEnableVertexAttribs( kCCVertexAttribFlag_Position | kCCVertexAttribFlag_Color );
    [self DrawOpengl];
    CGSize size = [[CCDirector sharedDirector] winSize];
    glClearColor(0.0, 0.0, 0.0, 0.0);
    glClear(GL_COLOR_BUFFER_BIT);
    glViewport(0, 0,size.width/2,size.height/2);

    [self DrawTriCone];
    glDisableVertexAttribArray(kCCVertexAttribFlag_Position);
    glEnable(GL_TEXTURE_2D);
}
@end


below is the code in HelloWorldLayer:
-(id) init
{
    // always call "super" init
    // Apple recommends to re-assign "self" with the "super's" return value
    if( (self=[super init]) ) {

        // create and initialize a Label
        CCLabelTTF *label = [CCLabelTTF labelWithString:@"Hello World" fontName:@"Marker Felt" fontSize:64];

        // ask director for the window size
        CGSize size = [[CCDirector sharedDirector] winSize];

        // position the label on the center of the screen
        label.position =  ccp( size.width /2 , size.height/2 );

        // add the label as a child to this Layer
        [self addChild:label];

        CCSprite *testsprite=[CCSprite spriteWithFile:@"grass.png" rect:CGRectMake(0, 0, 600, 600)];
        [self addChild:testsprite];
    MyNode *myNode =[MyNode node];
        myNode.position=ccp(size.width /2 , size.height/2);
        [self addChild:myNode];
}
return self
}
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