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using UnityEngine;
using UnityEngine.Serialization;
//behaviour which should lie on the same gameobject as the main camera
public class DepthPostprocessing : MonoBehaviour {
//material that's applied when doing postprocessing
[FormerlySerializedAs("postprocessMaterial"), SerializeField]
public Material PostprocessMaterial;
[FormerlySerializedAs("waveSpeed"), SerializeField]
public float WaveSpeed;
[FormerlySerializedAs("waveActive"), SerializeField]
public bool WaveActive;
private float waveDistance;
private void Start(){
//get the camera and tell it to render a depth texture
Camera cam = GetComponent<Camera>();
cam.depthTextureMode = cam.depthTextureMode | DepthTextureMode.Depth;
}
private void Update(){
//if the wave is active, make it move away, otherwise reset it
if(WaveActive){
waveDistance = waveDistance + WaveSpeed * Time.deltaTime;
} else {
waveDistance = 0;
}
}
//method which is automatically called by unity after the camera is done rendering
private void OnRenderImage(RenderTexture source, RenderTexture destination){
//sync the distance from the script to the shader
PostprocessMaterial.SetFloat("_WaveDistance", waveDistance);
//draws the pixels from the source texture to the destination texture
Graphics.Blit(source, destination, PostprocessMaterial);
}
}