/**
 * @see https://github.com/evanw/glfx.js/blob/master/src/filters/adjust/noise.js
 */
export declare const frag = "\n\nuniform sampler2D u_Texture;\nin vec2 v_Uv;\n\nlayout(std140) uniform PostProcessingUniforms {\n  float u_Noise;\n};\n\nout vec4 outputColor;\n\n\n  float random (in vec2 st) {\n    return fract(sin(dot(st.xy,\n                        vec2(12.9898,78.233)))*\n        43758.5453123);\n  }\n\n\nvoid main() {\n  vec4 color = texture(SAMPLER_2D(u_Texture), v_Uv);\n\n  float u_Seed = 12345.0;\n\n  float randomValue = random(v_Uv * u_Seed);\n  float diff = (randomValue - 0.5) * u_Noise;\n\n  if (color.a > 0.0) {\n    color.rgb /= color.a;\n  }\n\n  color.r += diff;\n  color.g += diff;\n  color.b += diff;\n\n  // Premultiply alpha again.\n  color.rgb *= color.a;\n\n  outputColor = color;\n}\n";