using System;
|
using UnityEngine;
|
|
[ExecuteAlways]
|
[AddComponentMenu("Image Effects/Blur/Blur")]
|
public class Blur : MonoBehaviour
|
{
|
/// Blur iterations - larger number means more blur.
|
[Range(0, 10)]
|
public int iterations = 3;
|
|
/// Blur spread for each iteration. Lower values
|
/// give better looking blur, but require more iterations to
|
/// get large blurs. Value is usually between 0.5 and 1.0.
|
[Range(0.0f, 1.0f)]
|
public float blurSpread = 0.6f;
|
|
|
// --------------------------------------------------------
|
// The blur iteration shader.
|
// Basically it just takes 4 texture samples and averages them.
|
// By applying it repeatedly and spreading out sample locations
|
// we get a Gaussian blur approximation.
|
|
public Shader blurShader {
|
get { return Shader.Find("Hidden/BlurEffectConeTap"); }
|
}
|
|
static Material m_Material = null;
|
protected Material material {
|
get {
|
if (m_Material == null)
|
{
|
m_Material = new Material(blurShader);
|
m_Material.hideFlags = HideFlags.DontSave;
|
}
|
return m_Material;
|
}
|
}
|
|
protected void Awake()
|
{
|
CameraUtility.RegisterBlur(this);
|
}
|
|
private void OnDestroy()
|
{
|
CameraUtility.UnRegisterBlur(this);
|
}
|
|
protected void OnDisable()
|
{
|
if (m_Material)
|
{
|
DestroyImmediate(m_Material);
|
}
|
}
|
|
// --------------------------------------------------------
|
|
protected void Start()
|
{
|
// Disable if we don't support image effects
|
if (!SystemInfo.supportsImageEffects)
|
{
|
enabled = false;
|
return;
|
}
|
// Disable if the shader can't run on the users graphics card
|
if (!blurShader || !material.shader.isSupported)
|
{
|
enabled = false;
|
return;
|
}
|
}
|
|
// Performs one blur iteration.
|
public void FourTapCone(RenderTexture source, RenderTexture dest, int iteration)
|
{
|
float off = 0.5f + iteration * blurSpread;
|
Graphics.BlitMultiTap(source, dest, material,
|
new Vector2(-off, -off),
|
new Vector2(-off, off),
|
new Vector2(off, off),
|
new Vector2(off, -off)
|
);
|
}
|
|
// Downsamples the texture to a quarter resolution.
|
private void DownSample4x(RenderTexture source, RenderTexture dest)
|
{
|
float off = 1.0f;
|
Graphics.BlitMultiTap(source, dest, material,
|
new Vector2(-off, -off),
|
new Vector2(-off, off),
|
new Vector2(off, off),
|
new Vector2(off, -off)
|
);
|
}
|
|
// Called by the camera to apply the image effect
|
void OnRenderImage(RenderTexture source, RenderTexture destination)
|
{
|
int rtW = source.width / 4;
|
int rtH = source.height / 4;
|
RenderTexture buffer = RenderTexture.GetTemporary(rtW, rtH, 0);
|
|
// Copy source to the 4x4 smaller texture.
|
DownSample4x(source, buffer);
|
|
// Blur the small texture
|
for (int i = 0; i < iterations; i++)
|
{
|
RenderTexture buffer2 = RenderTexture.GetTemporary(rtW, rtH, 0);
|
FourTapCone(buffer, buffer2, i);
|
RenderTexture.ReleaseTemporary(buffer);
|
buffer = buffer2;
|
}
|
Graphics.Blit(buffer, destination);
|
|
RenderTexture.ReleaseTemporary(buffer);
|
}
|
}
|
