HairStructs.h

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// Jolt Physics Library (https://github.com/jrouwe/JoltPhysics)
// SPDX-FileCopyrightText: 2026 Jorrit Rouwe
// SPDX-License-Identifier: MIT
 
#include "ShaderCore.h"
 
// Prevent including this file multiple times unless we're generating bindings
#if !defined(HAIR_STRUCTS_H) || defined(JPH_SHADER_GENERATE_WRAPPER)
#ifndef JPH_SHADER_GENERATE_WRAPPER
#define HAIR_STRUCTS_H
#endif
 
JPH_SUPPRESS_WARNING_PUSH
JPH_SUPPRESS_WARNINGS
 
JPH_SHADER_CONSTANT(int, cHairPerVertexBatch, 64)
JPH_SHADER_CONSTANT(int, cHairPerGridCellBatch, 32)
JPH_SHADER_CONSTANT(int, cHairPerStrandBatch, 32)
JPH_SHADER_CONSTANT(int, cHairPerRenderVertexBatch, 128)
 
JPH_SHADER_CONSTANT(int, cHairNumSVertexInfluences, 3)
 
JPH_SHADER_STRUCT_BEGIN(JPH_HairSkinWeight)
    JPH_SHADER_STRUCT_MEMBER(JPH_uint,          JointIdx)
    JPH_SHADER_STRUCT_MEMBER(JPH_float,         Weight)
JPH_SHADER_STRUCT_END(JPH_HairSkinWeight)
 
JPH_SHADER_STRUCT_BEGIN(JPH_HairSkinPoint)
    JPH_SHADER_STRUCT_MEMBER(JPH_uint,          TriangleIndex)      
    JPH_SHADER_STRUCT_MEMBER(JPH_float,         U)                  
    JPH_SHADER_STRUCT_MEMBER(JPH_float,         V)                  
    JPH_SHADER_STRUCT_MEMBER(JPH_uint,          ToBishop)           
JPH_SHADER_STRUCT_END(JPH_HairSkinPoint)
 
JPH_SHADER_STRUCT_BEGIN(JPH_HairGlobalPoseTransform)
    JPH_SHADER_STRUCT_MEMBER(JPH_float3,        Position)
    JPH_SHADER_STRUCT_MEMBER(JPH_Quat,          Rotation)
JPH_SHADER_STRUCT_END(JPH_HairGlobalPoseTransform)
 
JPH_SHADER_STRUCT_BEGIN(JPH_HairSVertexInfluence)
    JPH_SHADER_STRUCT_MEMBER(JPH_uint,          VertexIndex)        
    JPH_SHADER_STRUCT_MEMBER(JPH_float3,        RelativePosition)   
    JPH_SHADER_STRUCT_MEMBER(JPH_float,         Weight)             
JPH_SHADER_STRUCT_END(JPH_HairSVertexInfluence)
 
JPH_SHADER_STRUCT_BEGIN(JPH_HairPosition)
    JPH_SHADER_STRUCT_MEMBER(JPH_float3,        Position)
    JPH_SHADER_STRUCT_MEMBER(JPH_Quat,          Rotation)
JPH_SHADER_STRUCT_END(JPH_HairPosition)
 
JPH_SHADER_STRUCT_BEGIN(JPH_HairVelocity)
    JPH_SHADER_STRUCT_MEMBER(JPH_float3,        Velocity)
    JPH_SHADER_STRUCT_MEMBER(JPH_float3,        AngularVelocity)
JPH_SHADER_STRUCT_END(JPH_HairVelocity)
 
JPH_SHADER_STRUCT_BEGIN(JPH_HairMaterial)
    JPH_SHADER_STRUCT_MEMBER(JPH_float4,        WorldTransformInfluence)
    JPH_SHADER_STRUCT_MEMBER(JPH_float4,        GlobalPose)
    JPH_SHADER_STRUCT_MEMBER(JPH_float4,        SkinGlobalPose)
    JPH_SHADER_STRUCT_MEMBER(JPH_float4,        GravityFactor)
    JPH_SHADER_STRUCT_MEMBER(JPH_float4,        HairRadius)
    JPH_SHADER_STRUCT_MEMBER(JPH_float4,        BendComplianceMultiplier)
    JPH_SHADER_STRUCT_MEMBER(JPH_float4,        GridVelocityFactor)
    JPH_SHADER_STRUCT_MEMBER(JPH_uint,          EnableCollision)
    JPH_SHADER_STRUCT_MEMBER(JPH_uint,          EnableLRA)
    JPH_SHADER_STRUCT_MEMBER(JPH_uint,          EnableGrid)
    JPH_SHADER_STRUCT_MEMBER(JPH_float,         Friction)
    JPH_SHADER_STRUCT_MEMBER(JPH_float,         ExpLinearDampingDeltaTime)
    JPH_SHADER_STRUCT_MEMBER(JPH_float,         ExpAngularDampingDeltaTime)
    JPH_SHADER_STRUCT_MEMBER(JPH_float,         BendComplianceInvDeltaTimeSq)
    JPH_SHADER_STRUCT_MEMBER(JPH_float,         StretchComplianceInvDeltaTimeSq)
    JPH_SHADER_STRUCT_MEMBER(JPH_float,         GridDensityForceFactor)
    JPH_SHADER_STRUCT_MEMBER(JPH_float,         InertiaMultiplier)
    JPH_SHADER_STRUCT_MEMBER(JPH_float,         MaxLinearVelocitySq)
    JPH_SHADER_STRUCT_MEMBER(JPH_float,         MaxAngularVelocitySq)
JPH_SHADER_STRUCT_END(JPH_HairMaterial)
 
JPH_SHADER_STRUCT_BEGIN(JPH_HairCollisionPlane)
    JPH_SHADER_STRUCT_MEMBER(JPH_Plane,         Plane)
    JPH_SHADER_STRUCT_MEMBER(JPH_uint,          ShapeIndex)
JPH_SHADER_STRUCT_END(JPH_HairCollisionPlane)
 
JPH_SHADER_STRUCT_BEGIN(JPH_HairCollisionShape)
    JPH_SHADER_STRUCT_MEMBER(JPH_float3,        CenterOfMass)
    JPH_SHADER_STRUCT_MEMBER(JPH_float3,        LinearVelocity)
    JPH_SHADER_STRUCT_MEMBER(JPH_float3,        AngularVelocity)
JPH_SHADER_STRUCT_END(JPH_HairCollisionShape)
 
// Note: The order was chosen to match the struct between C++ and HLSL.
JPH_SHADER_CONSTANTS_BEGIN(JPH_HairUpdateContext, gContext)
    JPH_SHADER_CONSTANTS_MEMBER(JPH_uint,       NumStrands)
    JPH_SHADER_CONSTANTS_MEMBER(JPH_uint,       NumVertices)
    JPH_SHADER_CONSTANTS_MEMBER(JPH_uint,       NumGridPoints)
    JPH_SHADER_CONSTANTS_MEMBER(JPH_uint,       NumRenderVertices)
    JPH_SHADER_CONSTANTS_MEMBER(JPH_uint3,      GridSizeMin2)
    JPH_SHADER_CONSTANTS_MEMBER(JPH_float,      TwoDivDeltaTime)
    JPH_SHADER_CONSTANTS_MEMBER(JPH_float3,     GridSizeMin1)
    JPH_SHADER_CONSTANTS_MEMBER(JPH_float,      DeltaTime)
    JPH_SHADER_CONSTANTS_MEMBER(JPH_float3,     GridOffset)
    JPH_SHADER_CONSTANTS_MEMBER(JPH_float,      HalfDeltaTime)
    JPH_SHADER_CONSTANTS_MEMBER(JPH_float3,     GridScale)
    JPH_SHADER_CONSTANTS_MEMBER(JPH_float,      InvDeltaTimeSq)
    JPH_SHADER_CONSTANTS_MEMBER(JPH_float3,     SubStepGravity)
    JPH_SHADER_CONSTANTS_MEMBER(JPH_uint,       NumSkinVertices)
    JPH_SHADER_CONSTANTS_MEMBER(JPH_uint3,      GridStride)
    JPH_SHADER_CONSTANTS_MEMBER(JPH_uint,       NumSkinWeightsPerVertex)
    JPH_SHADER_CONSTANTS_MEMBER(JPH_Mat44,      DeltaTransform)
    JPH_SHADER_CONSTANTS_MEMBER(JPH_Mat44,      ScalpToHead)
    JPH_SHADER_CONSTANTS_MEMBER(JPH_Quat,       DeltaTransformQuat)
JPH_SHADER_CONSTANTS_END(JPH_HairUpdateContext)
 
// Note: The order was chosen to match the struct between C++ and HLSL.
JPH_SHADER_CONSTANTS_BEGIN(JPH_HairIterationContext, gIterationContext)
    JPH_SHADER_CONSTANTS_MEMBER(JPH_float,      AccumulatedDeltaTime)       
    JPH_SHADER_CONSTANTS_MEMBER(JPH_float,      IterationFraction)          
JPH_SHADER_CONSTANTS_END(JPH_HairIterationContext)
 
JPH_SUPPRESS_WARNING_POP
 
#endif // !defined(HAIR_STRUCTS_H) || defined(JPH_SHADER_GENERATE_WRAPPER)