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BobSong
2025-06-21 21:58:06 +08:00
parent d61516a576
commit e9f76d0f11
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315
Packages/com.waveharmonic.crest/Runtime/Scripts/Volume/UnderwaterRenderer.Effect.cs
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// Crest Water System
// Copyright © 2024 Wave Harmonic. All rights reserved.
using UnityEngine;
using UnityEngine.Rendering;
using WaveHarmonic.Crest.Internal;
namespace WaveHarmonic.Crest
{
partial class UnderwaterRenderer
{
const string k_KeywordFullScreenEffect = "_FULL_SCREEN_EFFECT";
const string k_KeywordDebugVisualizeMask = "_DEBUG_VISUALIZE_MASK";
const string k_KeywordDebugVisualizeStencil = "_DEBUG_VISUALIZE_STENCIL";
internal const string k_KeywordUnderwaterObjects = "CREST_UNDERWATER_OBJECTS_PASS";
static partial class ShaderIDs
{
// Local
public static readonly int s_HorizonNormal = Shader.PropertyToID("_Crest_HorizonNormal");
// Global
public static readonly int s_CameraColorTexture = Shader.PropertyToID("_Crest_CameraColorTexture");
public static readonly int s_WaterVolumeStencil = Shader.PropertyToID("_Crest_WaterVolumeStencil");
public static readonly int s_AmbientLighting = Shader.PropertyToID("_Crest_AmbientLighting");
public static readonly int s_ExtinctionMultiplier = Shader.PropertyToID("_Crest_ExtinctionMultiplier");
public static readonly int s_UnderwaterEnvironmentalLightingWeight = Shader.PropertyToID("_Crest_UnderwaterEnvironmentalLightingWeight");
// Built-ins
public static readonly int s_WorldSpaceLightPos0 = Shader.PropertyToID("_WorldSpaceLightPos0");
public static readonly int s_LightColor0 = Shader.PropertyToID("_LightColor0");
}
// These map to passes in the underwater shader.
internal enum EffectPass
{
FullScreen,
Reflections,
}
CommandBuffer _EffectCommandBuffer;
Material _CurrentWaterMaterial;
readonly UnderwaterSphericalHarmonicsData _SphericalHarmonicsData = new();
System.Action<CommandBuffer> _CopyColor;
RenderTargetIdentifier _ColorTarget = new
(
BuiltinRenderTextureType.CameraTarget,
0,
CubemapFace.Unknown,
-1
);
RenderTargetIdentifier _DepthStencilTarget = new
(
ShaderIDs.s_WaterVolumeStencil,
0,
CubemapFace.Unknown,
-1
);
RenderTargetIdentifier _ColorCopyTarget = new
(
ShaderIDs.s_CameraColorTexture,
0,
CubemapFace.Unknown,
-1
);
sealed class UnderwaterSphericalHarmonicsData
{
internal Color[] _AmbientLighting = new Color[1];
internal Vector3[] _DirectionsSH = { new(0.0f, 0.0f, 0.0f) };
}
void CopyColorTexture(CommandBuffer buffer)
{
// Use blit instead of CopyTexture as it will smooth out issues with format
// differences which is very hard to get right for BIRP.
buffer.Blit(BuiltinRenderTextureType.CameraTarget, _ColorCopyTarget);
if (UseStencilBuffer)
{
_EffectCommandBuffer.SetRenderTarget(_ColorTarget, _DepthStencilTarget);
}
else
{
_EffectCommandBuffer.SetRenderTarget(_ColorTarget);
}
}
void SetupUnderwaterEffect()
{
_EffectCommandBuffer ??= new()
{
name = "Underwater Pass",
};
_CopyColor ??= new(CopyColorTexture);
}
void OnPreRenderUnderwaterEffect(Camera camera)
{
#if UNITY_EDITOR
// Do not use this to prevent the mask from rendering due to portals and volumes feature.
if (!IsFogEnabledForEditorCamera(camera))
{
_EffectCommandBuffer?.Clear();
return;
}
#endif
var descriptor = XRHelpers.GetRenderTextureDescriptor(camera);
descriptor.useDynamicScale = camera.allowDynamicResolution;
// Format must be correct for CopyTexture to work. Hopefully this is good enough.
if (camera.allowHDR && QualitySettings.activeColorSpace == ColorSpace.Linear)
{
descriptor.graphicsFormat = SystemInfo.GetGraphicsFormat(_Water.LikelyFrameBufferFormat);
}
UpdateEffectMaterial(camera, _FirstRender);
_EffectCommandBuffer.Clear();
// No need to clear as Blit will overwrite everything.
_EffectCommandBuffer.GetTemporaryRT(ShaderIDs.s_CameraColorTexture, descriptor);
var sun = RenderSettings.sun;
if (sun != null)
{
// Unity does not set up lighting for us so we will get the last value which could incorrect.
// SetGlobalColor is just an alias for SetGlobalVector (no color space conversion like Material.SetColor):
// https://docs.unity3d.com/2017.4/Documentation/ScriptReference/Shader.SetGlobalColor.html
_EffectCommandBuffer.SetGlobalVector(ShaderIDs.s_LightColor0, sun.FinalColor());
_EffectCommandBuffer.SetGlobalVector(ShaderIDs.s_WorldSpaceLightPos0, -sun.transform.forward);
}
// Create a separate stencil buffer context by copying the depth texture.
if (UseStencilBuffer)
{
descriptor.colorFormat = RenderTextureFormat.Depth;
descriptor.depthBufferBits = (int)k_DepthBits;
// bindMS is necessary in this case for depth.
descriptor.SetMSAASamples(camera);
descriptor.bindMS = descriptor.msaaSamples > 1;
// No need to clear as Blit will overwrite everything.
_EffectCommandBuffer.GetTemporaryRT(ShaderIDs.s_WaterVolumeStencil, descriptor);
// Use blit for MSAA. We should be able to use CopyTexture. Might be the following bug:
// https://issuetracker.unity3d.com/product/unity/issues/guid/1308132
if (Helpers.IsMSAAEnabled(camera))
{
// Blit with a depth write shader to populate the depth buffer.
Helpers.Blit(_EffectCommandBuffer, _DepthStencilTarget, Helpers.UtilityMaterial, (int)Helpers.UtilityPass.CopyDepth);
}
else
{
// Copy depth then clear stencil.
_EffectCommandBuffer.CopyTexture(BuiltinRenderTextureType.Depth, _DepthStencilTarget);
Helpers.Blit(_EffectCommandBuffer, _DepthStencilTarget, Helpers.UtilityMaterial, (int)Helpers.UtilityPass.ClearStencil);
}
}
CopyColorTexture(_EffectCommandBuffer);
_EffectCommandBuffer.SetGlobalTexture(ShaderIDs.s_CameraColorTexture, _ColorCopyTarget);
ExecuteEffect(camera, _EffectCommandBuffer, _CopyColor);
_EffectCommandBuffer.ReleaseTemporaryRT(ShaderIDs.s_CameraColorTexture);
if (UseStencilBuffer)
{
_EffectCommandBuffer.ReleaseTemporaryRT(ShaderIDs.s_WaterVolumeStencil);
}
}
internal void ExecuteEffect(Camera camera, CommandBuffer buffer, System.Action<CommandBuffer> copyColor, MaterialPropertyBlock properties = null)
{
if (camera.cameraType == CameraType.Reflection)
{
buffer.DrawProcedural
(
Matrix4x4.identity,
_VolumeMaterial,
shaderPass: (int)EffectPass.Reflections,
MeshTopology.Triangles,
vertexCount: 3,
instanceCount: 1,
properties
);
}
#if d_CrestPortals
else if (_Portals.Active && _Portals.Mode != Portals.PortalMode.Tunnel)
{
_Portals.RenderEffect(camera, buffer, _VolumeMaterial, copyColor, properties);
}
#endif
else
{
buffer.DrawProcedural
(
Matrix4x4.identity,
_VolumeMaterial,
shaderPass: (int)EffectPass.FullScreen,
MeshTopology.Triangles,
vertexCount: 3,
instanceCount: 1,
properties
);
}
}
internal static void UpdateGlobals(Material waterMaterial)
{
// We will have the wrong color values if we do not use linear:
// https://forum.unity.com/threads/fragment-shader-output-colour-has-incorrect-values-when-hardcoded.377657/
// _CrestAbsorption is already set as global in Water Renderer.
Shader.SetGlobalColor(WaterRenderer.ShaderIDs.s_Scattering, waterMaterial.GetColor(WaterRenderer.ShaderIDs.s_Scattering).MaybeLinear());
Shader.SetGlobalFloat(WaterRenderer.ShaderIDs.s_Anisotropy, waterMaterial.GetFloat(WaterRenderer.ShaderIDs.s_Anisotropy));
}
internal void UpdateEffectMaterial(Camera camera, bool isFirstRender)
{
// Copy water material parameters to underwater material.
{
var material = _SurfaceMaterial;
if (_CopyWaterMaterialParametersEachFrame || isFirstRender || material != _CurrentWaterMaterial)
{
_CurrentWaterMaterial = material;
if (material != null)
{
_VolumeMaterial.CopyMatchingPropertiesFromMaterial(material);
if (_EnableShaderAPI)
{
UpdateGlobals(material);
}
}
}
}
// Enabling/disabling keywords each frame don't seem to have large measurable overhead
_VolumeMaterial.SetKeyword(k_KeywordDebugVisualizeMask, _Debug._VisualizeMask);
_VolumeMaterial.SetKeyword(k_KeywordDebugVisualizeStencil, _Debug._VisualizeStencil);
// We use this for caustics to get the displacement.
_VolumeMaterial.SetInteger(Lod.ShaderIDs.s_LodIndex, 0);
if (!Portaled && camera.cameraType != CameraType.Reflection)
{
var seaLevel = _Water.SeaLevel;
// We don't both setting the horizon value if we know we are going to be having to apply the effect
// full-screen anyway.
var forceFullShader = _Water.ViewerHeightAboveWater < -2f;
if (!forceFullShader)
{
var maxWaterVerticalDisplacement = _Water.MaximumVerticalDisplacement * 0.5f;
var cameraYPosition = camera.transform.position.y;
float nearPlaneFrustumWorldHeight;
{
var current = camera.ViewportToWorldPoint(new(0f, 0f, camera.nearClipPlane)).y;
float maxY = current, minY = current;
current = camera.ViewportToWorldPoint(new(0f, 1f, camera.nearClipPlane)).y;
maxY = Mathf.Max(maxY, current);
minY = Mathf.Min(minY, current);
current = camera.ViewportToWorldPoint(new(1f, 0f, camera.nearClipPlane)).y;
maxY = Mathf.Max(maxY, current);
minY = Mathf.Min(minY, current);
current = camera.ViewportToWorldPoint(new(1f, 1f, camera.nearClipPlane)).y;
maxY = Mathf.Max(maxY, current);
minY = Mathf.Min(minY, current);
nearPlaneFrustumWorldHeight = maxY - minY;
}
forceFullShader = (cameraYPosition + nearPlaneFrustumWorldHeight + maxWaterVerticalDisplacement) <= seaLevel;
}
_VolumeMaterial.SetKeyword(k_KeywordFullScreenEffect, forceFullShader);
}
// Project water normal onto camera plane.
{
var projectedNormal = new Vector2
(
Vector3.Dot(Vector3.up, camera.transform.right),
Vector3.Dot(Vector3.up, camera.transform.up)
);
_VolumeMaterial.SetVector(ShaderIDs.s_HorizonNormal, projectedNormal);
}
// Compute ambient lighting SH.
{
// We could pass in a renderer which would prime this lookup. However it doesnt make sense to use an existing render
// at different position, as this would then thrash it and negate the priming functionality. We could create a dummy invis GO
// with a dummy Renderer which might be enough, but this is hacky enough that we'll wait for it to become a problem
// rather than add a pre-emptive hack.
UnityEngine.Profiling.Profiler.BeginSample("Crest: Underwater Sample Spherical Harmonics");
LightProbes.GetInterpolatedProbe(camera.transform.position, null, out var sphericalHarmonicsL2);
sphericalHarmonicsL2.Evaluate(_SphericalHarmonicsData._DirectionsSH, _SphericalHarmonicsData._AmbientLighting);
Helpers.SetShaderVector(_VolumeMaterial, ShaderIDs.s_AmbientLighting, _SphericalHarmonicsData._AmbientLighting[0], _EnableShaderAPI);
UnityEngine.Profiling.Profiler.EndSample();
}
}
}
}