cocos2d中默认shader的使用问题

Cocos2d-x
#1

如何使用cocos2d中默认的shader

自己做的这么也没有任何效果，不知是什么问题

希望大神能介绍下默认shader的使用

self.shaderProgram =  programForKey:kCCShader_PositionColor];

    ccGLEnableVertexAttribs(kCCVertexAttribFlag_Position|kCCVertexAttribFlag_Color);

    ;

    ;

    ccGLBlendFunc(GL_ONE, GL_ONE_MINUS_SRC_ALPHA);

    

    ccVertex2F vertices;

    ccColor4F colors;

    

    int nVertices = 0;

    

    vertices = (ccVertex2F){0,0};

    colors = (ccColor4F){0,0,0,1};

    vertices = (ccVertex2F){10,0};

    colors = (ccColor4F){0,0,0,1};

    vertices = (ccVertex2F){0,10};

    colors = (ccColor4F){0,0,0,1};

    vertices = (ccVertex2F){10,10};

    colors = (ccColor4F){0,0,0,1};

    //glUniform4f(m_iColorLocation, 1.f, 1.f, 1.f, 1.f);

    glVertexAttribPointer(kCCVertexAttrib_Position, 2, GL_FLOAT, GL_FALSE, 0, vertices);

    glVertexAttribPointer(kCCVertexAttrib_Color, 4, GL_FLOAT, GL_FALSE, 0, colors);

    glDrawArrays(GL_TRIANGLE_STRIP, 0, (GLsizei)nVertices);

    CC_INCREMENT_GL_DRAWS(1);

    CHECK_GL_ERROR_DEBUG();



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