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104 lines
3.2 KiB
104 lines
3.2 KiB
using UnityEngine;
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using UnityEngine.Rendering;
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namespace LeTai.Effects
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{
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public class ScalableBlur : IBlurAlgorithm
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{
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Material material;
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ScalableBlurConfig config;
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const int BLUR_PASS = 0;
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const int CROP_BLUR_PASS = 1;
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Material Material
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{
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get
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{
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if (material == null)
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Material = new Material(Shader.Find("Hidden/EfficientBlur"));
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return material;
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}
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set => material = value;
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}
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~ScalableBlur()
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{
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if (!material) return;
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if (Application.isPlaying)
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Object.Destroy(material);
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else
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Object.DestroyImmediate(material);
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}
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public void Configure(BlurConfig config)
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{
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this.config = (ScalableBlurConfig) config;
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}
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public void Blur(CommandBuffer cmd,
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RenderTargetIdentifier src,
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Rect srcCropRegion,
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RenderTexture target)
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{
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float radius = config.Radius;
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Material.SetFloat(ShaderProperties.blurRadius, radius);
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Material.SetVector(ShaderProperties.blurTextureCropRegion, srcCropRegion.ToMinMaxVector());
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int firstDownsampleFactor = config.Iteration > 0 ? 1 : 0;
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int stepCount = Mathf.Max(config.Iteration * 2 - 1, 1);
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int firstIRT = ShaderProperties.intermediateRT[0];
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CreateTempRenderTextureFrom(cmd, firstIRT, target, firstDownsampleFactor);
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// cmd.BlitFullscreenTriangle(src, firstIRT, Material, CROP_BLUR_PASS);
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cmd.Blit(src, firstIRT, Material, CROP_BLUR_PASS);
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for (var i = 1; i < stepCount; i++)
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{
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BlurAtDepth(cmd, i, target);
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}
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// cmd.BlitFullscreenTriangle(ShaderProperties.intermediateRT[stepCount - 1], target, Material, BLUR_PASS);
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cmd.Blit(ShaderProperties.intermediateRT[stepCount - 1], target, Material, BLUR_PASS);
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CleanupIntermediateRT(cmd, stepCount);
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}
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protected virtual void BlurAtDepth(CommandBuffer cmd, int depth, RenderTexture baseTexture)
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{
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int sizeLevel = Utility.SimplePingPong(depth, config.Iteration - 1) + 1;
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sizeLevel = Mathf.Min(sizeLevel, config.MaxDepth);
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CreateTempRenderTextureFrom(cmd, ShaderProperties.intermediateRT[depth], baseTexture, sizeLevel);
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// cmd.BlitFullscreenTriangle(
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cmd.Blit(
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ShaderProperties.intermediateRT[depth - 1],
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ShaderProperties.intermediateRT[depth],
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Material,
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0
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);
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}
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static void CreateTempRenderTextureFrom(CommandBuffer cmd,
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int nameId,
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RenderTexture src,
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int downsampleFactor)
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{
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int w = src.width >> downsampleFactor; //= width / 2^downsample
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int h = src.height >> downsampleFactor;
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cmd.GetTemporaryRT(nameId, w, h, 0, FilterMode.Bilinear, src.format);
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}
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static void CleanupIntermediateRT(CommandBuffer cmd, int amount)
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{
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for (var i = 0; i < amount; i++)
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{
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cmd.ReleaseTemporaryRT(ShaderProperties.intermediateRT[i]);
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}
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}
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}
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}
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