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42 lines
1.6 KiB
C
42 lines
1.6 KiB
C
// Copyright Epic Games, Inc. All Rights Reserved.
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/*================================================================================================
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StrataDefinitions.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 strata dependent shaders (use https://www.random.org/cgi-bin/randbyte?nbytes=4&format=h)
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#define STRATA_SHADER_VERSION 0xc9624d0e
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#define STRATA_MAX_BSDF_COUNT_PER_LAYER 4
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#define STRATA_MAX_LAYER_COUNT 4
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#define STRATA_MAX_BSDF_COUNT 15
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// It this is changed, STATE_BIT_COUNT_SHAREDLOCALBASESID and HEADER_BIT_COUNT_SHAREDLOCALBASES_COUNT also needs to be updated
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#define STRATA_MAX_SHAREDLOCALBASES_REGISTERS 4
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#define STRATA_PACKED_SHAREDLOCALBASIS_STRIDE_BYTES 4
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#define STRATA_BSDF_TYPE_SLAB 0
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#define STRATA_BSDF_TYPE_VOLUMETRICFOGCLOUD 1
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#define STRATA_BSDF_TYPE_UNLIT 2
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#define STRATA_BSDF_TYPE_HAIR 3
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#define STRATA_BSDF_TYPE_SINGLELAYERWATER 4
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// When more than 8 BSDF must exists, please update STATE_BITS_BSDF and FStrataClassification.ShadingModels packing in Strata.ush
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#define STRATA_DATA_TILE_SIZE 8
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#define STRATA_DATA_TILE_SIZE_DIV_AS_SHIFT 3
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// The default thickness of a layer is considered to be 0.01 centimeter = 0.1 millimeter
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#define STRATA_LAYER_DEFAULT_THICKNESS_CM 0.01f
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// The thin lighting model is used when the thickness becomes strictly lower than 0.1 millimeter
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#define STRATA_LAYER_ISTHIN_THICKNESS_THRESHOLD_CM 0.01f
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