阶段性完成
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SoulliesOfficial
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using System;
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using UnityEngine;
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using UnityEngine.Rendering;
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namespace LeTai.Asset.TranslucentImage
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{
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public class ScalableBlur : IBlurAlgorithm
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{
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readonly RenderTargetIdentifier[] scratches = new RenderTargetIdentifier[14];
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bool isBirp;
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Material material;
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ScalableBlurConfig config;
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MaterialPropertyBlock propertyBlock;
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LocalKeyword kwBackgroundFillNone;
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LocalKeyword kwBackgroundFillColor;
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LocalKeyword kwUseExtraSample;
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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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{
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Material = new Material(Shader.Find(isBirp
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? "Hidden/EfficientBlur"
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: "Hidden/EfficientBlur_UniversalRP"));
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}
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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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public void Init(BlurConfig config, bool isBirp)
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{
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this.isBirp = isBirp;
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this.config = (ScalableBlurConfig)config;
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propertyBlock = propertyBlock ?? new MaterialPropertyBlock();
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}
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public void Blur(
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CommandBuffer cmd,
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RenderTargetIdentifier src,
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Rect srcCropRegion,
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Rect activeRegion,
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BackgroundFill backgroundFill,
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RenderTexture target
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)
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{
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(float strength, float radius, int iterations) = GetEffectiveConfig(target.width / srcCropRegion.width,
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target.height / srcCropRegion.height);
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var offsetDistanceDown = (radius / 2f) * Vector2.one;
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var offsetDistanceUp = (radius / 2f /*- .5f*/) * Vector2.one;
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int stepCount = Mathf.Clamp(iterations * 2, 1, scratches.Length * 2 - 1);
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float extent = strength;
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var activeRegionRelative = RectUtils.Intersect(activeRegion, srcCropRegion);
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activeRegionRelative.x = (activeRegionRelative.x - srcCropRegion.x) / srcCropRegion.width;
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activeRegionRelative.y = (activeRegionRelative.y - srcCropRegion.y) / srcCropRegion.height;
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activeRegionRelative.width = activeRegionRelative.width / srcCropRegion.width;
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activeRegionRelative.height = activeRegionRelative.height / srcCropRegion.height;
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if (activeRegionRelative.width == 0 || activeRegionRelative.height == 0)
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return;
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ConfigMaterial(backgroundFill);
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propertyBlock.Clear();
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propertyBlock.SetInteger("_IsLast", 0);
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if (stepCount > 1)
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{
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CropViewport(target.width >> 1, target.height >> 1, extent, out var viewportFirst, out var activeRegionFirst);
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propertyBlock.SetVector(ShaderID.CROP_REGION, RectUtils.ToMinMaxVector(RectUtils.Crop(srcCropRegion, activeRegionFirst)));
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var targetSize1 = new Vector2(target.width >> 1, target.height >> 1);
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propertyBlock.SetVector(ShaderID.TARGET_SIZE, targetSize1);
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propertyBlock.SetVector(ShaderID.OFFSET, offsetDistanceDown / targetSize1);
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Blitter.Blit(cmd, src, scratches[0], Material, 0, propertyBlock, viewportFirst);
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}
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var maxDepth = Mathf.Min(iterations - 1, scratches.Length - 1);
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for (var i = 1; i < stepCount - 1; i++)
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{
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var fromIdx = SimplePingPong(i - 1, maxDepth);
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var toIdx = SimplePingPong(i, maxDepth);
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var targetDepth = toIdx + 1;
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CropViewport(target.width >> targetDepth, target.height >> targetDepth, extent, out var viewportStep, out var activeRegionStep);
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propertyBlock.SetVector(ShaderID.CROP_REGION, RectUtils.ToMinMaxVector(activeRegionStep));
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var targetSizeStep = new Vector2(target.width >> targetDepth, target.height >> targetDepth);
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propertyBlock.SetVector(ShaderID.TARGET_SIZE, targetSizeStep);
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propertyBlock.SetVector(ShaderID.OFFSET, i < maxDepth
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? offsetDistanceDown / targetSizeStep
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: offsetDistanceUp / targetSizeStep);
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Blitter.Blit(cmd, scratches[fromIdx], scratches[toIdx], Material, 0, propertyBlock, viewportStep);
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}
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CropViewport(target.width, target.height, 0, out var viewportLast, out var activeRegionLast);
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activeRegionLast = stepCount > 1 ? activeRegionLast : RectUtils.Crop(srcCropRegion, activeRegionLast);
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propertyBlock.SetVector(ShaderID.CROP_REGION, RectUtils.ToMinMaxVector(activeRegionLast));
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var targetSizeFinal = new Vector2(target.width, target.height);
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propertyBlock.SetVector(ShaderID.TARGET_SIZE, targetSizeFinal);
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propertyBlock.SetVector(ShaderID.OFFSET, stepCount == 1
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? offsetDistanceDown / targetSizeFinal
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: offsetDistanceUp / targetSizeFinal);
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propertyBlock.SetInteger(ShaderID.IS_LAST, 1);
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Blitter.Blit(cmd,
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stepCount > 1 ? scratches[0] : src,
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target,
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Material,
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0,
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propertyBlock,
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viewportLast);
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return;
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void CropViewport(int targetWidth, int targetHeight, float padding, out Rect viewport, out Rect activeRegionSnapped)
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{
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var x = activeRegionRelative.x * targetWidth;
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var y = activeRegionRelative.y * targetHeight;
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var xf = Mathf.Floor(x - padding);
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var yf = Mathf.Floor(y - padding);
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viewport = new Rect(xf,
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yf,
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Mathf.Ceil(x + activeRegionRelative.width * targetWidth + padding) - xf,
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Mathf.Ceil(y + activeRegionRelative.height * targetHeight + padding) - yf);
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viewport.x = Mathf.Max(viewport.x, 0);
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viewport.y = Mathf.Max(viewport.y, 0);
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viewport.width = Mathf.Min(viewport.width, targetWidth);
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viewport.height = Mathf.Min(viewport.height, targetHeight);
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activeRegionSnapped = new Rect(
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viewport.x / targetWidth,
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viewport.y / targetHeight,
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viewport.width / targetWidth,
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viewport.height / targetHeight
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);
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}
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}
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public int GetScratchesCount(float targetWidth, float targetHeight)
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{
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var (_, _, iterations) = GetEffectiveConfig(targetWidth, targetHeight);
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return Mathf.Min(iterations, scratches.Length);
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}
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public void GetNextScratchDescriptor(ref RenderTextureDescriptor prevDescriptor)
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{
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prevDescriptor.width >>= 1;
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prevDescriptor.height >>= 1;
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if (prevDescriptor.width <= 0) prevDescriptor.width = 1;
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if (prevDescriptor.height <= 0) prevDescriptor.height = 1;
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}
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public void SetScratch(int index, RenderTargetIdentifier value)
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{
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scratches[index] = value;
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}
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protected void ConfigMaterial(BackgroundFill backgroundFill)
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{
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var mat = Material;
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if (kwUseExtraSample == default || !kwUseExtraSample.isValid)
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InitKeywords();
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switch (backgroundFill.mode)
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{
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case BackgroundFillMode.None:
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mat.SetKeyword(kwBackgroundFillNone, true);
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mat.SetKeyword(kwBackgroundFillNone, true);
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mat.SetKeyword(kwBackgroundFillColor, false);
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break;
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case BackgroundFillMode.Color:
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mat.SetKeyword(kwBackgroundFillColor, true);
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mat.SetKeyword(kwBackgroundFillNone, false);
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mat.SetColor(ShaderID.BACKGROUND_COLOR, backgroundFill.color);
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break;
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}
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mat.SetKeyword(kwUseExtraSample, config.Mode == ScalableBlurConfig.BlurMode.Balanced);
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}
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(float strength, float radius, int iteration) GetEffectiveConfig(float targetWidth, float targetHeight)
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{
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float scaleFactor = config.GetResolutionScaleFactor(targetWidth, targetHeight);
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float strength = config.Strength * scaleFactor;
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float radius;
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int iteration;
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if (!config.UseStrength)
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{
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radius = config.Radius * scaleFactor;
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iteration = config.Iteration;
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}
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else
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{
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(radius, iteration) = ScalableBlurConfig.FromStrength(strength);
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}
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return (strength, radius, iteration);
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}
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static int SimplePingPong(int t, int max)
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{
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if (t > max)
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return 2 * max - t;
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return t;
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}
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void InitKeywords()
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{
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var materialShader = Material.shader;
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kwBackgroundFillNone = new LocalKeyword(materialShader, "BACKGROUND_FILL_NONE");
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kwBackgroundFillColor = new LocalKeyword(materialShader, "BACKGROUND_FILL_COLOR");
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kwUseExtraSample = new LocalKeyword(materialShader, "USE_EXTRA_SAMPLE");
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}
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}
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}
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