126 lines
4.2 KiB
C#
126 lines
4.2 KiB
C#
// Crest Water System
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// Copyright © 2024 Wave Harmonic. All rights reserved.
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#if d_UnityHDRP
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using UnityEditor;
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using UnityEngine;
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using UnityEngine.Rendering.HighDefinition;
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namespace WaveHarmonic.Crest
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{
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sealed class SampleShadowsHDRP : CustomPass
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{
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static SampleShadowsHDRP s_Instance;
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static readonly string s_Name = "Sample Shadows";
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// These values come from unity_MatrxVP value in the frame debugger. unity_MatrxVP is marked as legacy and
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// breaks XR SPI. It is defined in:
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// "Packages/com.unity.render-pipelines.high-definition/Runtime/ShaderLibrary/EditorShaderVariables.hlsl"
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static readonly Matrix4x4 s_Matrix = new
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(
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new(2f, 0f, 0f, 0f),
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new(0f, -2f, 0f, 0f),
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new(0f, 0f, 0.00990099f, 0f),
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new(-1f, 1f, 0.990099f, 1f)
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);
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static class ShaderIDs
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{
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public static readonly int s_ViewProjectionMatrix = Shader.PropertyToID("_Crest_ViewProjectionMatrix");
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}
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GameObject _GameObject;
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int _XrTargetEyeIndex = -1;
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protected override void Execute(CustomPassContext context)
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{
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var water = WaterRenderer.Instance;
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if (water == null || !water._ShadowLod.Enabled)
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{
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return;
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}
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#if UNITY_EDITOR
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if (!WaterRenderer.IsWithinEditorUpdate || EditorApplication.isPaused)
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{
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return;
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}
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#endif
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var camera = context.hdCamera.camera;
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// Custom passes execute for every camera. We only support one camera for now.
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if (!ReferenceEquals(camera, water.Viewer)) return;
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// TODO: bail when not executing for main light or when no main light exists?
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// if (renderingData.lightData.mainLightIndex == -1) return;
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camera.TryGetComponent<HDAdditionalCameraData>(out var cameraData);
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if (cameraData != null && cameraData.xrRendering)
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{
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XRHelpers.UpdatePassIndex(ref _XrTargetEyeIndex);
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// Skip the right eye as data is not stereo.
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if (_XrTargetEyeIndex == 1)
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{
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return;
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}
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}
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// Disable for XR SPI otherwise input will not have correct world position.
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if (cameraData != null && cameraData.xrRendering && XRHelpers.IsSinglePass)
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{
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context.cmd.DisableShaderKeyword("STEREO_INSTANCING_ON");
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}
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// We cannot seem to override this matrix so a reference manually.
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context.cmd.SetGlobalMatrix(ShaderIDs.s_ViewProjectionMatrix, s_Matrix);
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water._ShadowLod.BuildCommandBuffer(water, context.cmd);
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// Restore matrices otherwise remaining render will have incorrect matrices. Each pass is responsible for
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// restoring matrices if required.
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context.cmd.SetViewProjectionMatrices(camera.worldToCameraMatrix, camera.projectionMatrix);
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// Restore XR SPI as we cannot rely on remaining pipeline to do it for us.
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if (cameraData != null && cameraData.xrRendering && XRHelpers.IsSinglePass)
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{
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context.cmd.EnableShaderKeyword("STEREO_INSTANCING_ON");
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}
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}
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internal static void Enable(WaterRenderer water)
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{
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var gameObject = CustomPassHelpers.CreateOrUpdate
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(
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parent: water.Container.transform,
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s_Name,
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hide: !water._Debug._ShowHiddenObjects
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);
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CustomPassHelpers.CreateOrUpdate
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(
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gameObject,
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ref s_Instance,
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s_Name,
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CustomPassInjectionPoint.BeforeTransparent
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);
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s_Instance._GameObject = gameObject;
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}
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internal static void Disable()
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{
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// It should be safe to rely on this reference for this reference to fail.
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if (s_Instance != null && s_Instance._GameObject != null)
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{
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// Will also trigger Cleanup below.
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s_Instance._GameObject.SetActive(false);
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}
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}
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}
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}
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#endif // d_UnityHDRP
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