Added a clamp parameter to bloom

Author: Chman

CHANGELOG.md

@@ -4,6 +4,11 @@ All notable changes to this package will be documented in this file.
 The format is based on [Keep a Changelog](http://keepachangelog.com/en/1.0.0/)
 and this project adheres to [Semantic Versioning](http://semver.org/spec/v2.0.0.html).
 
+## [InDev]
+
+### Added
+- Bloom now comes with a **Clamp** parameter to limit the amount of bloom that comes with ultra-bright pixels.
+
 ## [2.0.6-preview]
 
 ### Fixed

PostProcessing/Editor/Effects/BloomEditor.cs

@@ -8,6 +8,7 @@ public sealed class BloomEditor : PostProcessEffectEditor<Bloom>
         SerializedParameterOverride m_Intensity;
         SerializedParameterOverride m_Threshold;
         SerializedParameterOverride m_SoftKnee;
+        SerializedParameterOverride m_Clamp;
         SerializedParameterOverride m_Diffusion;
         SerializedParameterOverride m_AnamorphicRatio;
         SerializedParameterOverride m_Color;
@@ -21,6 +22,7 @@ public override void OnEnable()
             m_Intensity = FindParameterOverride(x => x.intensity);
             m_Threshold = FindParameterOverride(x => x.threshold);
             m_SoftKnee = FindParameterOverride(x => x.softKnee);
+            m_Clamp = FindParameterOverride(x => x.clamp);
             m_Diffusion = FindParameterOverride(x => x.diffusion);
             m_AnamorphicRatio = FindParameterOverride(x => x.anamorphicRatio);
             m_Color = FindParameterOverride(x => x.color);
@@ -37,6 +39,7 @@ public override void OnInspectorGUI()
             PropertyField(m_Intensity);
             PropertyField(m_Threshold);
             PropertyField(m_SoftKnee);
+            PropertyField(m_Clamp);
             PropertyField(m_Diffusion);
             PropertyField(m_AnamorphicRatio);
             PropertyField(m_Color);

PostProcessing/Runtime/Effects/Bloom.cs

@@ -20,6 +20,9 @@ public sealed class Bloom : PostProcessEffectSettings
         [Range(0f, 1f), Tooltip("Makes transition between under/over-threshold gradual (0 = hard threshold, 1 = soft threshold).")]
         public FloatParameter softKnee = new FloatParameter { value = 0.5f };
 
+        [Tooltip("Clamps pixels to control the bloom amount.")]
+        public FloatParameter clamp = new FloatParameter { value = 65472f };
+
         [Range(1f, 10f), Tooltip("Changes the extent of veiling effects. For maximum quality stick to integer values. Because this value changes the internal iteration count, animating it isn't recommended as it may introduce small hiccups in the perceived radius.")]
         public FloatParameter diffusion = new FloatParameter { value = 7f };
 
@@ -122,6 +125,7 @@ public override void Render(PostProcessRenderContext context)
             float knee = lthresh * settings.softKnee.value + 1e-5f;
             var threshold = new Vector4(lthresh, lthresh - knee, knee * 2f, 0.25f / knee);
             sheet.properties.SetVector(ShaderIDs.Threshold, threshold);
+            sheet.properties.SetVector(ShaderIDs.Params, new Vector4(settings.clamp, 0f, 0f, 0f));
 
             int qualityOffset = settings.fastMode ? 1 : 0;
 

PostProcessing/Shaders/Builtins/Bloom.shader

@@ -14,6 +14,7 @@ Shader "Hidden/PostProcessing/Bloom"
         float _SampleScale;
         float4 _ColorIntensity;
         float4 _Threshold; // x: threshold value (linear), y: threshold - knee, z: knee * 2, w: 0.25 / knee
+        float4 _Params; // x: clamp, yzw: unused
 
         // ----------------------------------------------------------------------------------------
         // Prefilter
@@ -23,6 +24,7 @@ Shader "Hidden/PostProcessing/Bloom"
             half autoExposure = SAMPLE_TEXTURE2D(_AutoExposureTex, sampler_AutoExposureTex, uv).r;
             color *= autoExposure;
             color = QuadraticThreshold(color, _Threshold.x, _Threshold.yzw);
+            color = min(_Params.x, color); // clamp to max
             return color;
         }