Function brightnessValue

test/unit/webgl/p5.Shader.js:2536–2542

()

      const testShader = myp5.baseFilterShader().modify(() => {
        function brightnessValue() {
          let sum = 0;
          for (let i = 0; i < 3; i++) {
            sum += i;
          }
          return sum / 10; // 0+1+2=3, 3/10=0.3
        }
        const brightness = myp5.uniformFloat(brightnessValue);

        myp5.filterColor.begin();