code: function LGraphChannelsTexture() {
              this.addInput("R", "Texture");
              this.addInput("G", "Texture");
              this.addInput("B", "Texture");
              this.addInput("A", "Texture");
  
              this.addOutput("Texture", "Texture");
  
              this.properties = {
                  precision: LGraphTexture.DEFAULT,
                  R: 1,
                  G: 1,
                  B: 1,
                  A: 1
              };
              this._color = vec4.create();
              this._uniforms = {
                  u_textureR: 0,
                  u_textureG: 1,
                  u_textureB: 2,
                  u_textureA: 3,
                  u_color: this._color
              };
          }
docs: Texture Channels to Texture *****************************************