c++ - Cocos2d-x 3.8 - RenderTexture ,OpenGL not rendering -

i'm trying draw bezier line on texture created rendertexture, line not showing, texture

this tutorial followed

bezier.h:

class bezier : public node { private:     color4f genrandombrightcolor();  public:     sprite* create(float width, float height); }; 

bezier.cpp:

sprite* bezier::create(float width, float height){     auto rt = rendertexture::create(width, height);      auto randomcolor = genrandombrightcolor();      //rt->begin();     rt->beginwithclear(randomcolor.r, randomcolor.g, randomcolor.b, randomcolor.a);      //draw bezier line      int segments = 50;     //tried vec2     vertex2f vertices[51];     color4f colors[51];     float t = 0;      point startpoint = point(0, ccrandom_0_1()*height);     point anchor1 = point(ccrandom_0_1()*width / 2, ccrandom_0_1()*height);     point anchor2 = point((ccrandom_0_1()*width / 2) + (width / 2), ccrandom_0_1()*height);     point endpoint = point(width, ccrandom_0_1()*height);      //this copied drawnode should     (int = 0; < segments; i++){         colors[i] = color4f::white;         vertices[i] = vertex2f(powf(1 - t, 3) * startpoint.x + 3.0f * powf(1 - t, 2) * t * anchor1.x + 3.0f * (1 - t) * t * t * anchor2.x + t * t * t * endpoint.x,                         powf(1 - t, 3) * startpoint.y + 3.0f * powf(1 - t, 2) * t * anchor1.y + 3.0f * (1 - t) * t * t * anchor2.y + t * t * t * endpoint.y);         t += 1.0f / segments;     }     vertices[segments] = vertex2f(endpoint.x, endpoint.y);      //////////////////////////////////////////////////////////////////////////     auto shaderprogram = shadercache::getinstance()->getprogram(glprogram::shader_name_position_color);     setshaderprogram(shaderprogram);     cc_node_draw_setup();     gl::enablevertexattribs(gl::vertex_attrib_flag_position | gl::vertex_attrib_flag_color);     glvertexattribpointer(glprogram::vertex_attrib_position, 2, gl_float, gl_false, 0, vertices);     glvertexattribpointer(glprogram::vertex_attrib_color, 4, gl_float, gl_false, 0, colors);     gldrawarrays(gl_triangle_strip, 0, segments);      rt->end();      auto sprite = sprite::createwithtexture(rt->getsprite()->gettexture());     return sprite; }  color4f bezier::genrandombrightcolor(){     while (true){         float r = ccrandom_0_1();         float g = ccrandom_0_1();         float b = ccrandom_0_1();         if ((r < 0.25) && (g > 0.5) && (b > 0.75) || (r > 0.75) && (g > 0.5) && (b<0.25)){             return color4f(r,g,b,1);         }     } } 

gamescene.cpp:

#include <bezier.h> .... auto dl = new bezier(); auto sprite = dl->create(visiblesize.width, visiblesize.height/2); sprite->setposition(point(visiblesize.width / 2 + origin.x, visiblesize.height / 4 + origin.y)); this->addchild(sprite); 

here's screenshot: http://postimg.org/image/cvy46wtwv/

any appreciated! ps: i'm not using drawnode's function because want know more this

edit: got it! needed use custom command opengl code not working cocos2dx- 3.0 vs2013 cpp

in function create @ end ,put addchild(sprite) this:

auto sprite = sprite::createwithtexture(rt->getsprite()->gettexture()); addchild(sprite);     return sprite;