code: function LGraphTextureShader() {
              this.addOutput("out", "Texture");
              this.properties = {
                  code: "",
                  width: 512,
                  height: 512,
                  precision: LGraphTexture.DEFAULT
              };
  
              this.properties.code =
                  "\nvoid main() {\n  vec2 uv = v_coord;\n  vec3 color = vec3(0.0);\n//your code here\n\ngl_FragColor = vec4(color, 1.0);\n}\n";
              this._uniforms = { in_texture: 0, texSize: vec2.create(), time: 0 };
          }
docs: ****************************************************