code: function LGraphExposition() {
              this.addInput("in", "Texture");
              this.addInput("exp", "number");
              this.addOutput("out", "Texture");
              this.properties = { exposition: 1, precision: LGraphTexture.LOW };
              this._uniforms = { u_texture: 0, u_exposition: 1 };
          }
docs: simple exposition, but plan to expand it to support different gamma curves