updateFragmentShader static method

void updateFragmentShader({ required FragmentShader shader, required Color color, required double alpha, required double rippleScale, required double rippleAlpha, required Offset center, required double radius, required double blurRatio, required Size size, })

implementation from the following classes about InkSparkle.

Implementation

static void updateFragmentShader({
  required ui.FragmentShader shader,
  required Color color,
  required double alpha,
  required double rippleScale,
  required double rippleAlpha,
  required Offset center,
  required double radius,
  required double blurRatio,
  required Size size,
}) {
  final double turbulenceSeed = math.Random().nextDouble() * 1000.0;
  const double turbulenceScale = 1.5;
  final double turbulencePhase = turbulenceSeed + rippleScale;
  final double noisePhase = turbulencePhase;
  final double rotation1 = turbulencePhase * _rotateRight + 1.7 * math.pi;
  final double rotation2 = turbulencePhase * _rotateLeft + 2.0 * math.pi;
  final double rotation3 = turbulencePhase * _rotateRight + 2.75 * math.pi;

  shader
    // uColor
    ..setFloat(0, color.r)
    ..setFloat(1, color.g)
    ..setFloat(2, color.b)
    ..setFloat(3, color.a)
    // Composite 1 (u_alpha, u_sparkle_alpha, u_blur, u_radius_scale)
    ..setFloat(4, rippleAlpha)
    ..setFloat(5, alpha)
    ..setFloat(6, blurRatio)
    ..setFloat(7, rippleScale)
    // uCenter
    ..setFloat(8, center.dx)
    ..setFloat(9, center.dy)
    // uMaxRadius
    ..setFloat(10, radius)
    // uResolutionScale
    ..setFloat(11, 1.0 / size.width)
    ..setFloat(12, 1.0 / size.height)
    // uNoiseScale
    ..setFloat(13, _noiseDensity / size.width)
    ..setFloat(14, _noiseDensity / size.height)
    // uNoisePhase
    ..setFloat(15, noisePhase / 1000.0)
    // uCircle1
    ..setFloat(16, turbulenceScale * 0.5 + (turbulencePhase * 0.01 * math.cos(turbulenceScale * 0.55)))
    ..setFloat(17, turbulenceScale * 0.5 + (turbulencePhase * 0.01 * math.sin(turbulenceScale * 0.55)))
    // uCircle2
    ..setFloat(18, turbulenceScale * 0.2 + (turbulencePhase * -0.0066 * math.cos(turbulenceScale * 0.45)))
    ..setFloat(19, turbulenceScale * 0.2 + (turbulencePhase * -0.0066 * math.sin(turbulenceScale * 0.45)))
    // uCircle3
    ..setFloat(20, turbulenceScale + (turbulencePhase * -0.0066 * math.cos(turbulenceScale * 0.35)))
    ..setFloat(21, turbulenceScale + (turbulencePhase * -0.0066 * math.sin(turbulenceScale * 0.35)))
    // uRotation1
    ..setFloat(22, math.cos(rotation1))
    ..setFloat(23, math.sin(rotation1))
    // uRotation2
    ..setFloat(24, math.cos(rotation2))
    ..setFloat(25, math.sin(rotation2))
    // uRotation3
    ..setFloat(26, math.cos(rotation3))
    ..setFloat(27, math.sin(rotation3));
}