Can't asign shader to DrawNode

@owlet wrote:

Hi, I'm trying to asign custom shaders to DrawNode to be able to aply some effects onto custom drawings.

My cpp code is :

class MyDrawNode : public DrawNode {

public:
~MyDrawNode() {

}


static MyDrawNode * create() {
	MyDrawNode * ret = new (std::nothrow) MyDrawNode ();
	if (ret && ret->init()) {
		
		ret->autorelease();
		auto glp = GLProgram::createWithFilenames("shaders/ccShader_PositionColorLengthTexture.vert", "shaders/ccShader_PositionColorLengthTexture.frag");
		glp->retain();
		glp->bindAttribLocation(GLProgram::ATTRIBUTE_NAME_POSITION, GLProgram::VERTEX_ATTRIB_POSITION);
		glp->bindAttribLocation(GLProgram::ATTRIBUTE_NAME_COLOR, GLProgram::VERTEX_ATTRIB_COLOR);
		glp->bindAttribLocation(GLProgram::ATTRIBUTE_NAME_TEX_COORD, GLProgram::VERTEX_ATTRIB_TEX_COORDS);
		glp->link();
		CHECK_GL_ERROR_DEBUG();
		glp->updateUniforms();
		CHECK_GL_ERROR_DEBUG();

		GLProgramState* state = GLProgramState::getOrCreateWithGLProgram(glp);
		ret->setGLProgramState(state);
		ret->setShaderProgram(glp);
		glp->use();

	} else {
		CC_SAFE_DELETE(ret);
	}

	return ret;
}
};

I copy default ccShader_PositionColorLengthTexture.vert and shaders/ccShader_PositionColorLengthTexture.frag from cocos folder (I'm using cocos2dx 3.13 if its important) and change only I line in fragment shader :

gl_FragColor = vec4(1.0, 0.0, 0.0, 1.0);

So I assume that after that line in fragment shader all my drawings call will be drawn in Red color.
And if I set shaders to Sprite or Texture2D instances via the same code, I've got completely Red textures and sprites. So I have a question - How I can set custom shader into a drawing node ?

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