code: function LGraphTextureLUT() {
              this.addInput("Texture", "Texture");
              this.addInput("LUT", "Texture");
              this.addInput("Intensity", "number");
              this.addOutput("", "Texture");
              this.properties = {
                  intensity: 1,
                  precision: LGraphTexture.DEFAULT,
                  texture: null
              };
  
              if (!LGraphTextureLUT._shader) {
                  LGraphTextureLUT._shader = new GL.Shader(
                      Shader.SCREEN_VERTEX_SHADER,
                      LGraphTextureLUT.pixel_shader
                  );
              }
          }
docs: Texture LUT *****************************************