344 lines
14 KiB
C#
344 lines
14 KiB
C#
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using System;
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using UnityEngine.Assertions;
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namespace UnityEngine.Rendering.PostProcessing
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{
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/// <summary>
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/// Screen-space Reflections quality presets.
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/// </summary>
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public enum ScreenSpaceReflectionPreset
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{
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/// <summary>
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/// Lowest quality.
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/// </summary>
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Lower,
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/// <summary>
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/// Low quality.
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/// </summary>
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Low,
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/// <summary>
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/// Medium quality.
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/// </summary>
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Medium,
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/// <summary>
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/// High quality.
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/// </summary>
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High,
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/// <summary>
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/// Higher quality.
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/// </summary>
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Higher,
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/// <summary>
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/// Ultra quality.
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/// </summary>
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Ultra,
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/// <summary>
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/// Overkill (as in: don't use) quality.
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/// </summary>
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Overkill,
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/// <summary>
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/// Custom, tweakable quality settings.
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/// </summary>
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Custom
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}
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/// <summary>
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/// Screen-space Reflections buffer sizes.
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/// </summary>
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public enum ScreenSpaceReflectionResolution
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{
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/// <summary>
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/// Downsampled buffer. Faster but lower quality.
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/// </summary>
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Downsampled,
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/// <summary>
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/// Full-sized buffer. Slower but higher quality.
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/// </summary>
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FullSize,
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/// <summary>
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/// Supersampled buffer. Very slow but much higher quality.
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/// </summary>
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Supersampled
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}
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/// <summary>
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/// A volume parameter holding a <see cref="ScreenSpaceReflectionPreset"/> value.
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/// </summary>
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[Serializable]
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public sealed class ScreenSpaceReflectionPresetParameter : ParameterOverride<ScreenSpaceReflectionPreset> { }
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/// <summary>
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/// A volume parameter holding a <see cref="ScreenSpaceReflectionResolution"/> value.
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/// </summary>
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[Serializable]
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public sealed class ScreenSpaceReflectionResolutionParameter : ParameterOverride<ScreenSpaceReflectionResolution> { }
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/// <summary>
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/// This class holds settings for the Screen-space Reflections effect.
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/// </summary>
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[Serializable]
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[PostProcess(typeof(ScreenSpaceReflectionsRenderer), "Unity/Screen-space reflections")]
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public sealed class ScreenSpaceReflections : PostProcessEffectSettings
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{
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/// <summary>
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/// The quality preset to use for rendering. Use <see cref="ScreenSpaceReflectionPreset.Custom"/>
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/// to tweak settings.
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/// </summary>
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[Tooltip("Choose a quality preset, or use \"Custom\" to create your own custom preset. Don't use a preset higher than \"Medium\" if you desire good performance on consoles.")]
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public ScreenSpaceReflectionPresetParameter preset = new ScreenSpaceReflectionPresetParameter { value = ScreenSpaceReflectionPreset.Medium };
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/// <summary>
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/// The maximum number of steps in the raymarching pass. Higher values mean more reflections.
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/// </summary>
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[Range(0, 256), Tooltip("Maximum number of steps in the raymarching pass. Higher values mean more reflections.")]
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public IntParameter maximumIterationCount = new IntParameter { value = 16 };
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/// <summary>
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/// Changes the size of the internal buffer. Downsample it to maximize performances or
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/// supersample it to get slow but higher quality results.
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/// </summary>
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[Tooltip("Changes the size of the SSR buffer. Downsample it to maximize performances or supersample it for higher quality results with reduced performance.")]
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public ScreenSpaceReflectionResolutionParameter resolution = new ScreenSpaceReflectionResolutionParameter { value = ScreenSpaceReflectionResolution.Downsampled };
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/// <summary>
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/// The ray thickness. Lower values are more expensive but allow the effect to detect
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/// smaller details.
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/// </summary>
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[Range(1f, 64f), Tooltip("Ray thickness. Lower values are more expensive but allow the effect to detect smaller details.")]
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public FloatParameter thickness = new FloatParameter { value = 8f };
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/// <summary>
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/// The maximum distance to traverse in the scene after which it will stop drawing
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/// reflections.
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/// </summary>
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[Tooltip("Maximum distance to traverse after which it will stop drawing reflections.")]
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public FloatParameter maximumMarchDistance = new FloatParameter { value = 100f };
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/// <summary>
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/// Fades reflections close to the near plane. This is useful to hide common artifacts.
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/// </summary>
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[Range(0f, 1f), Tooltip("Fades reflections close to the near planes.")]
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public FloatParameter distanceFade = new FloatParameter { value = 0.5f };
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/// <summary>
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/// Fades reflections close to the screen edges.
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/// </summary>
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[Range(0f, 1f), Tooltip("Fades reflections close to the screen edges.")]
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public FloatParameter vignette = new FloatParameter { value = 0.5f };
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/// <summary>
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/// Returns <c>true</c> if the effect is currently enabled and supported.
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/// </summary>
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/// <param name="context">The current post-processing render context</param>
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/// <returns><c>true</c> if the effect is currently enabled and supported</returns>
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public override bool IsEnabledAndSupported(PostProcessRenderContext context)
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{
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return enabled
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&& context.camera.actualRenderingPath == RenderingPath.DeferredShading
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&& SystemInfo.supportsMotionVectors
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&& SystemInfo.supportsComputeShaders
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&& SystemInfo.copyTextureSupport > CopyTextureSupport.None
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&& context.resources.shaders.screenSpaceReflections
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&& context.resources.shaders.screenSpaceReflections.isSupported
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&& context.resources.computeShaders.gaussianDownsample;
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}
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}
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[UnityEngine.Scripting.Preserve]
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internal sealed class ScreenSpaceReflectionsRenderer : PostProcessEffectRenderer<ScreenSpaceReflections>
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{
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RenderTexture m_Resolve;
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RenderTexture m_History;
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int[] m_MipIDs;
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class QualityPreset
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{
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public int maximumIterationCount;
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public float thickness;
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public ScreenSpaceReflectionResolution downsampling;
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}
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readonly QualityPreset[] m_Presets =
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{
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new QualityPreset { maximumIterationCount = 10, thickness = 32, downsampling = ScreenSpaceReflectionResolution.Downsampled }, // Lower
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new QualityPreset { maximumIterationCount = 16, thickness = 32, downsampling = ScreenSpaceReflectionResolution.Downsampled }, // Low
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new QualityPreset { maximumIterationCount = 32, thickness = 16, downsampling = ScreenSpaceReflectionResolution.Downsampled }, // Medium
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new QualityPreset { maximumIterationCount = 48, thickness = 8, downsampling = ScreenSpaceReflectionResolution.Downsampled }, // High
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new QualityPreset { maximumIterationCount = 16, thickness = 32, downsampling = ScreenSpaceReflectionResolution.FullSize }, // Higher
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new QualityPreset { maximumIterationCount = 48, thickness = 16, downsampling = ScreenSpaceReflectionResolution.FullSize }, // Ultra
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new QualityPreset { maximumIterationCount = 128, thickness = 12, downsampling = ScreenSpaceReflectionResolution.Supersampled }, // Overkill
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};
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enum Pass
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{
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Test,
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Resolve,
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Reproject,
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Composite
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}
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public override DepthTextureMode GetCameraFlags()
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{
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return DepthTextureMode.Depth | DepthTextureMode.MotionVectors;
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}
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internal void CheckRT(ref RenderTexture rt, int width, int height, FilterMode filterMode, bool useMipMap)
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{
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if (rt == null || !rt.IsCreated() || rt.width != width || rt.height != height)
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{
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if (rt != null)
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{
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rt.Release();
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RuntimeUtilities.Destroy(rt);
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}
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rt = new RenderTexture(width, height, 0, RuntimeUtilities.defaultHDRRenderTextureFormat)
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{
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filterMode = filterMode,
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useMipMap = useMipMap,
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autoGenerateMips = false,
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hideFlags = HideFlags.HideAndDontSave
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};
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rt.Create();
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}
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}
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public override void Render(PostProcessRenderContext context)
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{
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var cmd = context.command;
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cmd.BeginSample("Screen-space Reflections");
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// Get quality settings
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if (settings.preset.value != ScreenSpaceReflectionPreset.Custom)
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{
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int id = (int)settings.preset.value;
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settings.maximumIterationCount.value = m_Presets[id].maximumIterationCount;
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settings.thickness.value = m_Presets[id].thickness;
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settings.resolution.value = m_Presets[id].downsampling;
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}
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settings.maximumMarchDistance.value = Mathf.Max(0f, settings.maximumMarchDistance.value);
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// Square POT target
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int size = Mathf.ClosestPowerOfTwo(Mathf.Min(context.width, context.height));
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if (settings.resolution.value == ScreenSpaceReflectionResolution.Downsampled)
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size >>= 1;
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else if (settings.resolution.value == ScreenSpaceReflectionResolution.Supersampled)
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size <<= 1;
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// The gaussian pyramid compute works in blocks of 8x8 so make sure the last lod has a
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// minimum size of 8x8
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const int kMaxLods = 12;
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int lodCount = Mathf.FloorToInt(Mathf.Log(size, 2f) - 3f);
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lodCount = Mathf.Min(lodCount, kMaxLods);
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CheckRT(ref m_Resolve, size, size, FilterMode.Trilinear, true);
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var noiseTex = context.resources.blueNoise256[0];
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var sheet = context.propertySheets.Get(context.resources.shaders.screenSpaceReflections);
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sheet.properties.SetTexture(ShaderIDs.Noise, noiseTex);
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var screenSpaceProjectionMatrix = new Matrix4x4();
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screenSpaceProjectionMatrix.SetRow(0, new Vector4(size * 0.5f, 0f, 0f, size * 0.5f));
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screenSpaceProjectionMatrix.SetRow(1, new Vector4(0f, size * 0.5f, 0f, size * 0.5f));
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screenSpaceProjectionMatrix.SetRow(2, new Vector4(0f, 0f, 1f, 0f));
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screenSpaceProjectionMatrix.SetRow(3, new Vector4(0f, 0f, 0f, 1f));
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var projectionMatrix = GL.GetGPUProjectionMatrix(context.camera.projectionMatrix, false);
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screenSpaceProjectionMatrix *= projectionMatrix;
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sheet.properties.SetMatrix(ShaderIDs.ViewMatrix, context.camera.worldToCameraMatrix);
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sheet.properties.SetMatrix(ShaderIDs.InverseViewMatrix, context.camera.worldToCameraMatrix.inverse);
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sheet.properties.SetMatrix(ShaderIDs.ScreenSpaceProjectionMatrix, screenSpaceProjectionMatrix);
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sheet.properties.SetVector(ShaderIDs.Params, new Vector4((float)settings.vignette.value, settings.distanceFade.value, settings.maximumMarchDistance.value, lodCount));
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sheet.properties.SetVector(ShaderIDs.Params2, new Vector4((float)context.width / (float)context.height, (float)size / (float)noiseTex.width, settings.thickness.value, settings.maximumIterationCount.value));
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cmd.GetTemporaryRT(ShaderIDs.Test, size, size, 0, FilterMode.Point, context.sourceFormat);
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cmd.BlitFullscreenTriangle(context.source, ShaderIDs.Test, sheet, (int)Pass.Test);
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if (context.isSceneView)
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{
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cmd.BlitFullscreenTriangle(context.source, m_Resolve, sheet, (int)Pass.Resolve);
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}
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else
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{
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CheckRT(ref m_History, size, size, FilterMode.Bilinear, false);
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if (m_ResetHistory)
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{
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context.command.BlitFullscreenTriangle(context.source, m_History);
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m_ResetHistory = false;
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}
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cmd.GetTemporaryRT(ShaderIDs.SSRResolveTemp, size, size, 0, FilterMode.Bilinear, context.sourceFormat);
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cmd.BlitFullscreenTriangle(context.source, ShaderIDs.SSRResolveTemp, sheet, (int)Pass.Resolve);
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sheet.properties.SetTexture(ShaderIDs.History, m_History);
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cmd.BlitFullscreenTriangle(ShaderIDs.SSRResolveTemp, m_Resolve, sheet, (int)Pass.Reproject);
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cmd.CopyTexture(m_Resolve, 0, 0, m_History, 0, 0);
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cmd.ReleaseTemporaryRT(ShaderIDs.SSRResolveTemp);
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}
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cmd.ReleaseTemporaryRT(ShaderIDs.Test);
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// Pre-cache mipmaps ids
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if (m_MipIDs == null || m_MipIDs.Length == 0)
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{
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m_MipIDs = new int[kMaxLods];
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for (int i = 0; i < kMaxLods; i++)
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m_MipIDs[i] = Shader.PropertyToID("_SSRGaussianMip" + i);
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}
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var compute = context.resources.computeShaders.gaussianDownsample;
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int kernel = compute.FindKernel("KMain");
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var mipFormat = RuntimeUtilities.defaultHDRRenderTextureFormat;
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var last = new RenderTargetIdentifier(m_Resolve);
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for (int i = 0; i < lodCount; i++)
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{
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size >>= 1;
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Assert.IsTrue(size > 0);
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cmd.GetTemporaryRT(m_MipIDs[i], size, size, 0, FilterMode.Bilinear, mipFormat, RenderTextureReadWrite.Default, 1, true);
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cmd.SetComputeTextureParam(compute, kernel, "_Source", last);
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cmd.SetComputeTextureParam(compute, kernel, "_Result", m_MipIDs[i]);
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cmd.SetComputeVectorParam(compute, "_Size", new Vector4(size, size, 1f / size, 1f / size));
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cmd.DispatchCompute(compute, kernel, size / 8, size / 8, 1);
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cmd.CopyTexture(m_MipIDs[i], 0, 0, m_Resolve, 0, i + 1);
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last = m_MipIDs[i];
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}
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for (int i = 0; i < lodCount; i++)
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cmd.ReleaseTemporaryRT(m_MipIDs[i]);
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sheet.properties.SetTexture(ShaderIDs.Resolve, m_Resolve);
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cmd.BlitFullscreenTriangle(context.source, context.destination, sheet, (int)Pass.Composite, preserveDepth: true);
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cmd.EndSample("Screen-space Reflections");
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}
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public override void Release()
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{
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RuntimeUtilities.Destroy(m_Resolve);
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RuntimeUtilities.Destroy(m_History);
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m_Resolve = null;
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m_History = null;
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}
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}
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}
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