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using UnityEngine.Rendering;
namespace UnityEngine.Experimental.Rendering.HDPipeline
{
public partial class Lit : RenderPipelineMaterial
{
[GenerateHLSL(PackingRules.Exact)]
public enum MaterialId
{
LitSSS = 0,
LitStandard = 1,
LitAniso = 2,
LitClearCoat = 3,
// LitSpecular (DiffuseColor/SpecularColor) is an alternate parametrization for LitStandard (BaseColor/Metal/Specular), but it is the same shading model
// We don't want any specific materialId for it, instead we use LitStandard as materialId. However for UI purpose we still define this value here.
// For material classification we will use LitStandard too
LitSpecular = 4,
};
// If change, be sure it match what is done in Lit.hlsl: MaterialFeatureFlagsFromGBuffer
// Material bit mask must match LightDefinitions.s_MaterialFeatureMaskFlags value
[GenerateHLSL]
public enum MaterialFeatureFlags
{
LitSSS = 1 << MaterialId.LitSSS,
LitStandard = 1 << MaterialId.LitStandard,
LitAniso = 1 << MaterialId.LitAniso,
LitClearCoat = 1 << MaterialId.LitClearCoat,
};
[GenerateHLSL]
public class StandardDefinitions
{
public static int s_GBufferLitStandardRegularId = 0;
public static int s_GBufferLitStandardSpecularColorId = 1;
public static float s_DefaultSpecularValue = 0.04f;
public static float s_SkinSpecularValue = 0.028f;
}
//-----------------------------------------------------------------------------
// SurfaceData
//-----------------------------------------------------------------------------
// Main structure that store the user data (i.e user input of master node in material graph)
[GenerateHLSL(PackingRules.Exact, false, true, 1000)]
public struct SurfaceData
{
[SurfaceDataAttributes("Base Color", false, true)]
public Vector3 baseColor;
[SurfaceDataAttributes("Specular Occlusion")]
public float specularOcclusion;
[SurfaceDataAttributes("Normal", true)]
public Vector3 normalWS;
[SurfaceDataAttributes("Smoothness")]
public float perceptualSmoothness;
[SurfaceDataAttributes("Material ID")]
public MaterialId materialId; // matId above 3 are store in standard material gbuffer (2bit reserved)
[SurfaceDataAttributes("Ambient Occlusion")]
public float ambientOcclusion;
// MaterialId dependent attribute
// standard
[SurfaceDataAttributes("Tangent", true)]
public Vector3 tangentWS;
[SurfaceDataAttributes("Anisotropy")]
public float anisotropy; // anisotropic ratio(0->no isotropic; 1->full anisotropy in tangent direction)
[SurfaceDataAttributes("Metallic")]
public float metallic;
// SSS
[SurfaceDataAttributes("Subsurface Radius")]
public float subsurfaceRadius;
[SurfaceDataAttributes("Thickness")]
public float thickness;
[SurfaceDataAttributes("Subsurface Profile")]
public int subsurfaceProfile;
// SpecColor
[SurfaceDataAttributes("Specular Color", false, true)]
public Vector3 specularColor;
// ClearCoat
[SurfaceDataAttributes("Coat Normal", true)]
public Vector3 coatNormalWS;
[SurfaceDataAttributes("Coat coverage")]
public float coatCoverage;
[SurfaceDataAttributes("Coat IOR")]
public float coatIOR; // Value is [0..1] for artists but the UI will display the value between [1..2]
};
//-----------------------------------------------------------------------------
// BSDFData
//-----------------------------------------------------------------------------
[GenerateHLSL(PackingRules.Exact)]
public enum TransmissionType
{
None = 0,
Regular = 1,
ThinObject = 2,
};
[GenerateHLSL(PackingRules.Exact, false, true, 1030)]
public struct BSDFData
{
[SurfaceDataAttributes("", false, true)]
public Vector3 diffuseColor;
public Vector3 fresnel0;
public float specularOcclusion;
[SurfaceDataAttributes("", true)]
public Vector3 normalWS;
public float perceptualRoughness;
public float roughness;
public int materialId;
// MaterialId dependent attribute
// standard
[SurfaceDataAttributes("", true)]
public Vector3 tangentWS;
[SurfaceDataAttributes("", true)]
public Vector3 bitangentWS;
public float roughnessT;
public float roughnessB;
public float anisotropy;
// fold into fresnel0
// SSS
public float subsurfaceRadius;
public float thickness;
public int subsurfaceProfile;
public bool enableTransmission; // Read from the SSS profile
public bool useThinObjectMode; // Read from the SSS profile
public Vector3 transmittance;
// SpecColor
// fold into fresnel0
// ClearCoat
public Vector3 coatNormalWS;
public float coatCoverage;
public float coatIOR; // CoatIOR is in range[1..2] it is surfaceData + 1
};
//-----------------------------------------------------------------------------
// RenderLoop management
//-----------------------------------------------------------------------------
[GenerateHLSL(PackingRules.Exact)]
public enum GBufferMaterial
{
// Note: This count doesn't include the velocity buffer. On shader and csharp side the velocity buffer will be added by the framework
Count = (ShaderConfig.k_PackgbufferInU16 == 1) ? 2 : 4
};
//-----------------------------------------------------------------------------
// GBuffer management
//-----------------------------------------------------------------------------
public override int GetMaterialGBufferCount() { return (int)GBufferMaterial.Count; }
public override void GetMaterialGBufferDescription(out RenderTextureFormat[] RTFormat, out RenderTextureReadWrite[] RTReadWrite)
{
RTFormat = new RenderTextureFormat[(int)GBufferMaterial.Count];
RTReadWrite = new RenderTextureReadWrite[(int)GBufferMaterial.Count];
if (ShaderConfig.s_PackgbufferInU16 == 1)
{
// TODO: Just discovered that Unity doesn't support unsigned 16 RT format.
RTFormat[0] = RenderTextureFormat.ARGBInt; RTReadWrite[0] = RenderTextureReadWrite.Linear;
RTFormat[1] = RenderTextureFormat.ARGBInt; RTReadWrite[1] = RenderTextureReadWrite.Linear;
}
else
{
RTFormat[0] = RenderTextureFormat.ARGB32; RTReadWrite[0] = RenderTextureReadWrite.sRGB;
RTFormat[1] = RenderTextureFormat.ARGB2101010; RTReadWrite[1] = RenderTextureReadWrite.Linear;
RTFormat[2] = RenderTextureFormat.ARGB32; RTReadWrite[2] = RenderTextureReadWrite.Linear;
RTFormat[3] = RenderTextureFormat.RGB111110Float; RTReadWrite[3] = RenderTextureReadWrite.Linear;
}
}
//-----------------------------------------------------------------------------
// Init precomputed texture
//-----------------------------------------------------------------------------
bool m_isInit;
// For image based lighting
Material m_InitPreFGD;
RenderTexture m_PreIntegratedFGD;
// For area lighting - We pack all texture inside a texture array to reduce the number of resource required
Texture2DArray m_LtcData; // 0: m_LtcGGXMatrix - RGBA, 2: m_LtcDisneyDiffuseMatrix - RGBA, 3: m_LtcMultiGGXFresnelDisneyDiffuse - RGB, A unused
const int k_LtcLUTMatrixDim = 3; // size of the matrix (3x3)
const int k_LtcLUTResolution = 64;
// Load LUT with one scalar in alpha of a tex2D
void LoadLUT(Texture2DArray tex, int arrayElement, TextureFormat format, float[] LUTScalar)
{
const int count = k_LtcLUTResolution * k_LtcLUTResolution;
Color[] pixels = new Color[count];
for (int i = 0; i < count; i++)
{
pixels[i] = new Color(0, 0, 0, LUTScalar[i]);
}
tex.SetPixels(pixels, arrayElement);
}
// Load LUT with 3x3 matrix in RGBA of a tex2D (some part are zero)
void LoadLUT(Texture2DArray tex, int arrayElement, TextureFormat format, double[,] LUTTransformInv)
{
const int count = k_LtcLUTResolution * k_LtcLUTResolution;
Color[] pixels = new Color[count];
for (int i = 0; i < count; i++)
{
// Both GGX and Disney Diffuse BRDFs have zero values in columns 1, 3, 5, 7.
// Column 8 contains only ones.
pixels[i] = new Color((float)LUTTransformInv[i, 0],
(float)LUTTransformInv[i, 2],
(float)LUTTransformInv[i, 4],
(float)LUTTransformInv[i, 6]);
}
tex.SetPixels(pixels, arrayElement);
}
// Special-case function for 'm_LtcMultiGGXFresnelDisneyDiffuse'.
void LoadLUT(Texture2DArray tex, int arrayElement, TextureFormat format, float[] LtcGGXMagnitudeData,
float[] LtcGGXFresnelData,
float[] LtcDisneyDiffuseMagnitudeData)
{
const int count = k_LtcLUTResolution * k_LtcLUTResolution;
Color[] pixels = new Color[count];
for (int i = 0; i < count; i++)
{
// We store the result of the subtraction as a run-time optimization.
// See the footnote 2 of "LTC Fresnel Approximation" by Stephen Hill.
pixels[i] = new Color(LtcGGXMagnitudeData[i] - LtcGGXFresnelData[i],
LtcGGXFresnelData[i], LtcDisneyDiffuseMagnitudeData[i], 1);
}
tex.SetPixels(pixels, arrayElement);
}
public Lit() {}
public override void Build(RenderPipelineResources renderPipelineResources)
{
m_InitPreFGD = Utilities.CreateEngineMaterial("Hidden/HDRenderPipeline/PreIntegratedFGD");
// For DisneyDiffuse integration values goes from (0.5 to 1.53125). GGX need 0 to 1. Use float format.
m_PreIntegratedFGD = new RenderTexture(128, 128, 0, RenderTextureFormat.RGB111110Float, RenderTextureReadWrite.Linear);
m_PreIntegratedFGD.filterMode = FilterMode.Bilinear;
m_PreIntegratedFGD.wrapMode = TextureWrapMode.Clamp;
m_PreIntegratedFGD.hideFlags = HideFlags.DontSave;
m_PreIntegratedFGD.Create();
m_LtcData = new Texture2DArray(k_LtcLUTResolution, k_LtcLUTResolution, 3, TextureFormat.RGBAHalf, false /*mipmap*/, true /* linear */)
{
hideFlags = HideFlags.HideAndDontSave,
wrapMode = TextureWrapMode.Clamp,
filterMode = FilterMode.Bilinear
};
LoadLUT(m_LtcData, 0, TextureFormat.RGBAHalf, s_LtcGGXMatrixData);
LoadLUT(m_LtcData, 1, TextureFormat.RGBAHalf, s_LtcDisneyDiffuseMatrixData);
// TODO: switch to RGBA64 when it becomes available.
LoadLUT(m_LtcData, 2, TextureFormat.RGBAHalf, s_LtcGGXMagnitudeData, s_LtcGGXFresnelData, s_LtcDisneyDiffuseMagnitudeData);
m_LtcData.Apply();
m_isInit = false;
}
public override void Cleanup()
{
Utilities.Destroy(m_InitPreFGD);
// TODO: how to delete RenderTexture ? or do we need to do it ?
m_isInit = false;
}
public override void RenderInit(CommandBuffer cmd)
{
if (m_isInit)
return;
using (new Utilities.ProfilingSample("Init PreFGD", cmd))
{
Utilities.DrawFullScreen(cmd, m_InitPreFGD, new RenderTargetIdentifier(m_PreIntegratedFGD));
}
m_isInit = true;
}
public override void Bind()
{
Shader.SetGlobalTexture("_PreIntegratedFGD", m_PreIntegratedFGD);
Shader.SetGlobalTexture("_LtcData", m_LtcData);
}
}
}