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65de35fdfb
- MSM_Substrate - MCT_Substrate - FStrataMaterialInput #rb charles.derousiers [CL 27563163 by marc audy in ue5-main branch]
99 lines
3.8 KiB
C
99 lines
3.8 KiB
C
// Copyright Epic Games, Inc. All Rights Reserved.
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/*================================================================================================
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HairStrandsDefinitions.ush: used in ray tracing shaders and C++ code to define common constants
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!!! Changing this file requires recompilation of the engine !!!
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=================================================================================================*/
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#pragma once
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// Change this to force recompilation of all Substrate dependent shaders (use https://www.random.org/cgi-bin/randbyte?nbytes=4&format=h)
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#define HAIRSTRANDS_SHADER_VERSION 0x3ba5af0e
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// Curve Attribute index
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#define HAIR_CURVE_ATTRIBUTE_ROOTUV 0
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#define HAIR_CURVE_ATTRIBUTE_SEED 1
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#define HAIR_CURVE_ATTRIBUTE_LENGTH 2
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#define HAIR_CURVE_ATTRIBUTE_CLUMPID 3
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#define HAIR_CURVE_ATTRIBUTE_CLUMPID3 4
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#define HAIR_CURVE_ATTRIBUTE_COUNT 5
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// Point Attribute index
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#define HAIR_POINT_ATTRIBUTE_COLOR 0
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#define HAIR_POINT_ATTRIBUTE_ROUGHNESS 1
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#define HAIR_POINT_ATTRIBUTE_AO 2
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#define HAIR_POINT_ATTRIBUTE_COUNT 3
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// Groom limits (based on encoding)
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#define HAIR_MAX_NUM_POINT_PER_CURVE ((1u<<8)-1u)
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#define HAIR_MAX_NUM_POINT_PER_GROUP ((1u<<24)-1u)
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#define HAIR_MAX_NUM_CURVE_PER_GROUP ((1u<<22)-1u)
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#define HAIR_ATTRIBUTE_INVALID_OFFSET 0xFFFFFFFF
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// Hair interpolation (in bytes)
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#define HAIR_INTERPOLATION_1GUIDE_STRIDE 4
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#define HAIR_INTERPOLATION_3GUIDE_STRIDE 16
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// Max number of discrete LOD that a hair group can have
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#define MAX_HAIR_LOD 8
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// Max split for raytracing geometry
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#define STRANDS_PROCEDURAL_INTERSECTOR_MAX_SPLITS 4
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// Use triangle strip for HW raster path
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#define USE_HAIR_TRIANGLE_STRIP 0
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// Number of vertex per control-point
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#if USE_HAIR_TRIANGLE_STRIP
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#define HAIR_POINT_TO_VERTEX 2u
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#else
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#define HAIR_POINT_TO_VERTEX 6u
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#endif
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// Number of triangle per control-point
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#define HAIR_POINT_TO_TRIANGLE 2u
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// Type of control points
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#define HAIR_CONTROLPOINT_INSIDE 0u
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#define HAIR_CONTROLPOINT_START 1u
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#define HAIR_CONTROLPOINT_END 2u
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// Group size for dispatching based on a groom vertex/curve/cluster count.
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// This defines ensures the group size is consistent across the hair pipeline,
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// and ensures dispatch count are smaller than 65k limits
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#define HAIR_VERTEXCOUNT_GROUP_SIZE 1024u
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#define HAIR_CURVECOUNT_GROUP_SIZE 1024u
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#define HAIR_CLUSTERCOUNT_GROUP_SIZE 1024u
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#define MAX_HAIR_MACROGROUP_COUNT 16
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// HAIR_XXX_ATTRIBUTE_MAX rounded to 4
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#define HAIR_CURVE_ATTRIBUTE_OFFSET_COUNT ((HAIR_CURVE_ATTRIBUTE_COUNT + 3) / 4)
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#define HAIR_POINT_ATTRIBUTE_OFFSET_COUNT ((HAIR_POINT_ATTRIBUTE_COUNT + 3) / 4)
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// Pack all offset into uint4
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#define PACK_HAIR_ATTRIBUTE_OFFSETS(Out, In, Offset, Count) \
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for (uint32 AttributeIt4 = 0; AttributeIt4 < Offset; ++AttributeIt4) \
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{ \
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Out[AttributeIt4] = FUintVector4(HAIR_ATTRIBUTE_INVALID_OFFSET, HAIR_ATTRIBUTE_INVALID_OFFSET, HAIR_ATTRIBUTE_INVALID_OFFSET, HAIR_ATTRIBUTE_INVALID_OFFSET); \
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} \
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for (uint32 AttributeIt = 0; AttributeIt < Count; ++AttributeIt) \
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{ \
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const uint32 Index4 = AttributeIt & (~0x3); \
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const uint32 SubIndex = AttributeIt - Index4; \
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const uint32 IndexDiv4 = Index4 >> 2u; \
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Out[IndexDiv4][SubIndex] = In[AttributeIt]; \
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}
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#define PACK_CURVE_HAIR_ATTRIBUTE_OFFSETS(Out, In) PACK_HAIR_ATTRIBUTE_OFFSETS(Out, In, HAIR_CURVE_ATTRIBUTE_OFFSET_COUNT, HAIR_CURVE_ATTRIBUTE_COUNT)
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#define PACK_POINT_HAIR_ATTRIBUTE_OFFSETS(Out, In) PACK_HAIR_ATTRIBUTE_OFFSETS(Out, In, HAIR_POINT_ATTRIBUTE_OFFSET_COUNT, HAIR_POINT_ATTRIBUTE_COUNT)
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// Data for LODing points of a curve
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// The number of bits per vertex describe the maxium LOD decomposition
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// Each curve's point encode its minium LOD at which it becomes active
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#define HAIR_POINT_LOD_BIT_COUNT 4
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#define HAIR_POINT_LOD_COUNT_PER_UINT (32u/4u)
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#define HAIR_POINT_LOD_COUNT_PER_UINT_DIV_AS_SHIFT 3
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#define HAIR_RBF_ENTRY_COUNT(InSampleCount) ((InSampleCount)+4u) |