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101 lines
2.7 KiB
101 lines
2.7 KiB
3 years ago
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using UnityEngine;
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using System.Collections;
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public class GaussianBlur : PostEffectsBase {
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public Shader gaussianBlurShader;
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private Material gaussianBlurMaterial = null;
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public Material material {
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get {
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gaussianBlurMaterial = CheckShaderAndCreateMaterial(gaussianBlurShader, gaussianBlurMaterial);
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return gaussianBlurMaterial;
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}
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}
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// Blur iterations - larger number means more blur.
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[Range(0, 4)]
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public int iterations = 3;
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// Blur spread for each iteration - larger value means more blur
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[Range(0.2f, 3.0f)]
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public float blurSpread = 0.6f;
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[Range(1, 8)]
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public int downSample = 2;
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/// 1st edition: just apply blur
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// void OnRenderImage(RenderTexture src, RenderTexture dest) {
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// if (material != null) {
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// int rtW = src.width;
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// int rtH = src.height;
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// RenderTexture buffer = RenderTexture.GetTemporary(rtW, rtH, 0);
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//
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// // Render the vertical pass
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// Graphics.Blit(src, buffer, material, 0);
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// // Render the horizontal pass
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// Graphics.Blit(buffer, dest, material, 1);
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//
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// RenderTexture.ReleaseTemporary(buffer);
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// } else {
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// Graphics.Blit(src, dest);
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// }
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// }
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/// 2nd edition: scale the render texture
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// void OnRenderImage (RenderTexture src, RenderTexture dest) {
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// if (material != null) {
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// int rtW = src.width/downSample;
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// int rtH = src.height/downSample;
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// RenderTexture buffer = RenderTexture.GetTemporary(rtW, rtH, 0);
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// buffer.filterMode = FilterMode.Bilinear;
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//
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// // Render the vertical pass
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// Graphics.Blit(src, buffer, material, 0);
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// // Render the horizontal pass
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// Graphics.Blit(buffer, dest, material, 1);
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//
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// RenderTexture.ReleaseTemporary(buffer);
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// } else {
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// Graphics.Blit(src, dest);
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// }
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// }
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/// 3rd edition: use iterations for larger blur
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void OnRenderImage (RenderTexture src, RenderTexture dest) {
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if (material != null) {
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int rtW = src.width/downSample;
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int rtH = src.height/downSample;
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RenderTexture buffer0 = RenderTexture.GetTemporary(rtW, rtH, 0);
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buffer0.filterMode = FilterMode.Bilinear;
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Graphics.Blit(src, buffer0);
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for (int i = 0; i < iterations; i++) {
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material.SetFloat("_BlurSize", 1.0f + i * blurSpread);
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RenderTexture buffer1 = RenderTexture.GetTemporary(rtW, rtH, 0);
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// Render the vertical pass
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Graphics.Blit(buffer0, buffer1, material, 0);
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RenderTexture.ReleaseTemporary(buffer0);
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buffer0 = buffer1;
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buffer1 = RenderTexture.GetTemporary(rtW, rtH, 0);
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// Render the horizontal pass
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Graphics.Blit(buffer0, buffer1, material, 1);
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RenderTexture.ReleaseTemporary(buffer0);
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buffer0 = buffer1;
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}
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Graphics.Blit(buffer0, dest);
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RenderTexture.ReleaseTemporary(buffer0);
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} else {
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Graphics.Blit(src, dest);
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}
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}
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}
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