Sample for subclassing cocos2d::Node with basic rendering through a (batchable) TriangleCommand

SimpleCommand.cpp

#include "SimpleCommand.h"
 
USING_NS_CC;
using namespace std;
 
Scene* SimpleCommand::scene () {
    Scene *scene = Scene::create();
    scene->addChild(SimpleCommand::create());
    return scene;
}
 
bool SimpleCommand::init () {
    if (!Node::init()) return false;
 
    setGLProgramState(GLProgramState::getOrCreateWithGLProgramName(GLProgram::SHADER_NAME_POSITION_TEXTURE_COLOR_NO_MVP));
 
    _texture = _director->getTextureCache()->addImage("sprite.png");
   
    setPosition(100, 100);
 
    return true;
}
 
void SimpleCommand::draw (Renderer* renderer, const Mat4& transform, uint32_t transformFlags) {
    TrianglesCommand::Triangles* triangles = new TrianglesCommand::Triangles();
   
    float x = 0, y = 0;
    float w = 80, h = 80;
 
    triangles->vertCount = 4;
    triangles->verts = new V3F_C4B_T2F[4];
    triangles->verts[0].colors = Color4B::WHITE;
    triangles->verts[0].texCoords.u = 0;
    triangles->verts[0].texCoords.v = 1;
    triangles->verts[0].vertices.x = 0;
    triangles->verts[0].vertices.y = 0;
    triangles->verts[0].vertices.z = 0;
 
    triangles->verts[1].colors = Color4B::WHITE;
    triangles->verts[1].texCoords.u = 0;
    triangles->verts[1].texCoords.v = 0;
    triangles->verts[1].vertices.x = 0;
    triangles->verts[1].vertices.y = h;
    triangles->verts[1].vertices.z = 0;
 
    triangles->verts[2].colors = Color4B::WHITE;
    triangles->verts[2].texCoords.u = 1;
    triangles->verts[2].texCoords.v = 1;
    triangles->verts[2].vertices.x = w;
    triangles->verts[2].vertices.y = 0;
    triangles->verts[2].vertices.z = 0;
 
    triangles->verts[3].colors = Color4B::WHITE;
    triangles->verts[3].texCoords.u = 1;
    triangles->verts[3].texCoords.v = 0;
    triangles->verts[3].vertices.x = w;
    triangles->verts[3].vertices.y = h;
    triangles->verts[3].vertices.z = 0;
 
    triangles->indexCount = 6;
    triangles->indices = new GLushort[6];
    triangles->indices[0] = 0;
    triangles->indices[1] = 1;
    triangles->indices[2] = 2;
    triangles->indices[3] = 3;
    triangles->indices[4] = 2;
    triangles->indices[5] = 1;
 
    TrianglesCommand* trianglesCommand = new TrianglesCommand();
    trianglesCommand->init(_globalZOrder, _texture->getName(), getGLProgramState(), BlendFunc::ALPHA_PREMULTIPLIED, *triangles, transform, transformFlags);
    renderer->addCommand(trianglesCommand);
}

SimpleCommand.h

#ifndef _SIMPLECOMMAND_H_
#define _SIMPLECOMMAND_H_

class SimpleCommand : public cocos2d::Node {
public:
    static cocos2d::Scene* scene ();
 
    virtual bool init ();
    virtual void draw (cocos2d::Renderer* renderer, const cocos2d::Mat4& transform, uint32_t transformFlags) override;
 
    CREATE_FUNC (SimpleCommand);
 
protected:
    cocos2d::Texture2D* _texture;
};
 
#endif // _SIMPLECOMMAND_H_