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using UnityEngine;
using UnityEngine.Rendering;
using UnityEngine.Rendering.Universal;
namespace FlatKit;
public class FlatKitFog : ScriptableRendererFeature
{
[Tooltip("To create new settings use 'Create > FlatKit > Fog Settings'.")]
public FogSettings settings;
[SerializeField]
[HideInInspector]
private Material _effectMaterial;
private BlitTexturePass _blitTexturePass;
private RenderTargetHandle _fogTexture;
private Texture2D _lutDepth;
private Texture2D _lutHeight;
private static readonly string FogShaderName = "Hidden/FlatKit/FogFilter";
private static readonly int DistanceLut = Shader.PropertyToID("_DistanceLUT");
private static readonly int Near = Shader.PropertyToID("_Near");
private static readonly int Far = Shader.PropertyToID("_Far");
private static readonly int UseDistanceFog = Shader.PropertyToID("_UseDistanceFog");
private static readonly int UseDistanceFogOnSky = Shader.PropertyToID("_UseDistanceFogOnSky");
private static readonly int DistanceFogIntensity = Shader.PropertyToID("_DistanceFogIntensity");
private static readonly int HeightLut = Shader.PropertyToID("_HeightLUT");
private static readonly int LowWorldY = Shader.PropertyToID("_LowWorldY");
private static readonly int HighWorldY = Shader.PropertyToID("_HighWorldY");
private static readonly int UseHeightFog = Shader.PropertyToID("_UseHeightFog");
private static readonly int UseHeightFogOnSky = Shader.PropertyToID("_UseHeightFogOnSky");
private static readonly int HeightFogIntensity = Shader.PropertyToID("_HeightFogIntensity");
private static readonly int DistanceHeightBlend = Shader.PropertyToID("_DistanceHeightBlend");
public override void Create()
{
if (settings == null)
{
Debug.LogWarning("[FlatKit] Missing Fog Settings");
return;
}
_blitTexturePass = new BlitTexturePass
{
renderPassEvent = settings.renderEvent
};
_fogTexture.Init("_EffectTexture");
}
public override void AddRenderPasses(ScriptableRenderer renderer, ref RenderingData renderingData)
{
if (settings == null)
{
Debug.LogWarning("[FlatKit] Missing Fog Settings");
}
else if (CreateMaterials())
{
SetMaterialProperties();
_blitTexturePass.Setup(_effectMaterial, useDepth: true, useNormals: false, useColor: false);
renderer.EnqueuePass(_blitTexturePass);
}
}
protected override void Dispose(bool disposing)
{
CoreUtils.Destroy(_effectMaterial);
}
private bool CreateMaterials()
{
if (_effectMaterial == null)
{
Shader shader = Shader.Find(FogShaderName);
Shader shader2 = Shader.Find(BlitTexturePass.CopyEffectShaderName);
if (shader == null || shader2 == null)
{
return false;
}
_effectMaterial = CoreUtils.CreateEngineMaterial(shader);
}
return true;
}
private void SetMaterialProperties()
{
if (!(_effectMaterial == null))
{
UpdateDistanceLut();
_effectMaterial.SetTexture(DistanceLut, _lutDepth);
_effectMaterial.SetFloat(Near, settings.near);
_effectMaterial.SetFloat(Far, settings.far);
_effectMaterial.SetFloat(UseDistanceFog, settings.useDistance ? 1f : 0f);
_effectMaterial.SetFloat(UseDistanceFogOnSky, settings.useDistanceFogOnSky ? 1f : 0f);
_effectMaterial.SetFloat(DistanceFogIntensity, settings.distanceFogIntensity);
UpdateHeightLut();
_effectMaterial.SetTexture(HeightLut, _lutHeight);
_effectMaterial.SetFloat(LowWorldY, settings.low);
_effectMaterial.SetFloat(HighWorldY, settings.high);
_effectMaterial.SetFloat(UseHeightFog, settings.useHeight ? 1f : 0f);
_effectMaterial.SetFloat(UseHeightFogOnSky, settings.useHeightFogOnSky ? 1f : 0f);
_effectMaterial.SetFloat(HeightFogIntensity, settings.heightFogIntensity);
_effectMaterial.SetFloat(DistanceHeightBlend, settings.distanceHeightBlend);
}
}
private void UpdateDistanceLut()
{
if (settings.distanceGradient == null)
{
return;
}
if (_lutDepth != null)
{
Object.DestroyImmediate(_lutDepth);
}
_lutDepth = new Texture2D(256, 1, TextureFormat.RGBA32, mipChain: false)
{
wrapMode = TextureWrapMode.Clamp,
hideFlags = HideFlags.HideAndDontSave,
filterMode = FilterMode.Bilinear
};
for (float num = 0f; num < 256f; num += 1f)
{
Color color = settings.distanceGradient.Evaluate(num / 255f);
for (float num2 = 0f; num2 < 1f; num2 += 1f)
{
_lutDepth.SetPixel(Mathf.CeilToInt(num), Mathf.CeilToInt(num2), color);
}
}
_lutDepth.Apply();
}
private void UpdateHeightLut()
{
if (settings.heightGradient == null)
{
return;
}
if (_lutHeight != null)
{
Object.DestroyImmediate(_lutHeight);
}
_lutHeight = new Texture2D(256, 1, TextureFormat.RGBA32, mipChain: false)
{
wrapMode = TextureWrapMode.Clamp,
hideFlags = HideFlags.HideAndDontSave,
filterMode = FilterMode.Bilinear
};
for (float num = 0f; num < 256f; num += 1f)
{
Color color = settings.heightGradient.Evaluate(num / 255f);
for (float num2 = 0f; num2 < 1f; num2 += 1f)
{
_lutHeight.SetPixel(Mathf.CeilToInt(num), Mathf.CeilToInt(num2), color);
}
}
_lutHeight.Apply();
}
}
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