unityglitch/GlitchEffect.cs at master · lvchy/unityglitch · GitHub

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/**
This work is licensed under a Creative Commons Attribution 3.0 Unported License.
http://creativecommons.org/licenses/by/3.0/deed.en_GB

You are free:

to copy, distribute, display, and perform the work
to make derivative works
to make commercial use of the work
*/

using UnityEngine;
using UnityStandardAssets.ImageEffects;
#if UNITY_EDITOR
using UnityEditor;
#endif

#if UNITY_EDITOR
[ExecuteInEditMode]
[AddComponentMenu ("Image Effects/GlitchEffect")]
#endif
public class GlitchEffect : ImageEffectBase {
	public Texture2D displacementMap;
	float glitchup, glitchdown, flicker,
			glitchupTime = 0.05f, glitchdownTime = 0.05f, flickerTime = 0.5f;

    [Header("Glitch Intensity")]

    [Range(0, 1)]
    public float intensity;

    [Range(0, 1)]
    public float flipIntensity;

    [Range(0, 1)]
    public float colorIntensity;

	// Called by camera to apply image effect
	void OnRenderImage (RenderTexture source, RenderTexture destination) {

		material.SetFloat("_Intensity", intensity);
        material.SetFloat("_ColorIntensity", colorIntensity);
		material.SetTexture("_DispTex", displacementMap);

        flicker += Time.deltaTime * colorIntensity;
        if (flicker > flickerTime){
			material.SetFloat("filterRadius", Random.Range(-3f, 3f) * colorIntensity);
            material.SetVector("direction", Quaternion.AngleAxis(Random.Range(0, 360) * colorIntensity, Vector3.forward) * Vector4.one);
            flicker = 0;
			flickerTime = Random.value;
		}

        if (colorIntensity == 0)
            material.SetFloat("filterRadius", 0);

        glitchup += Time.deltaTime * flipIntensity;
        if (glitchup > glitchupTime){
			if(Random.value < 0.1f * flipIntensity)
				material.SetFloat("flip_up", Random.Range(0, 1f) * flipIntensity);
			else
				material.SetFloat("flip_up", 0);

			glitchup = 0;
			glitchupTime = Random.value/10f;
		}

        if (flipIntensity == 0)
            material.SetFloat("flip_up", 0);


        glitchdown += Time.deltaTime * flipIntensity;
        if (glitchdown > glitchdownTime){
			if(Random.value < 0.1f * flipIntensity)
				material.SetFloat("flip_down", 1 - Random.Range(0, 1f) * flipIntensity);
			else
				material.SetFloat("flip_down", 1);

			glitchdown = 0;
			glitchdownTime = Random.value/10f;
		}

        if (flipIntensity == 0)
            material.SetFloat("flip_down", 1);

        if (Random.value < 0.05 * intensity){
			material.SetFloat("displace", Random.value * intensity);
			material.SetFloat("scale", 1 - Random.value * intensity);
        }
        else
			material.SetFloat("displace", 0);

		Graphics.Blit (source, destination, material);
	}
}