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b651c4a844
Use bitmasks to track enabled volumes instead of an array of uint IDs. This further reduces the live state of the main TraceRay call. It also simplifies the logic for volume tracing, giving an overall speedup around 5-10% (depending on the scene). #jira UE-202786 [CL 30704921 by chris kulla in ue5-main branch]
69 lines
3.9 KiB
C
69 lines
3.9 KiB
C
// Copyright Epic Games, Inc. All Rights Reserved.
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#pragma once
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// Constants for 'SamplerType'
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#define PATHTRACER_SAMPLER_DEFAULT 0
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#define PATHTRACER_SAMPLER_ERROR_DIFFUSION 1
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// Constants for the 'Flags' field of FPathTracingLight
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#define PATHTRACER_FLAG_LIGHTING_CHANNEL_MASK (7 << 0) // Which lighting channel is this light assigned to?
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#define PATHTRACER_FLAG_TRANSMISSION_MASK (1 << 3) // Does the light affect the transmission side?
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#define PATHTRACER_FLAG_NON_INVERSE_SQUARE_FALLOFF_MASK (1 << 4) // Does the light have a non-inverse square decay?
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#define PATHTRACER_FLAG_STATIONARY_MASK (1 << 5) // Only used by GPULightmass
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#define PATHTRACER_FLAG_TYPE_MASK (7 << 6)
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#define PATHTRACING_LIGHT_SKY (0 << 6)
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#define PATHTRACING_LIGHT_DIRECTIONAL (1 << 6)
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#define PATHTRACING_LIGHT_POINT (2 << 6)
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#define PATHTRACING_LIGHT_SPOT (3 << 6)
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#define PATHTRACING_LIGHT_RECT (4 << 6)
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#define PATHTRACER_FLAG_CAST_SHADOW_MASK (1 << 9)
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#define PATHTRACER_FLAG_CAST_VOL_SHADOW_MASK (1 << 10)
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#define PATHTRACER_FLAG_HAS_RECT_TEXTURE_MASK (1 << 11)
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#define PATHTRACER_MASK_CAMERA 0x01 // opaque and alpha tested meshes and particles as a whole (primary ray) excluding hairs
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#define PATHTRACER_MASK_HAIR_CAMERA 0x02 // For primary ray tracing against hair
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#define PATHTRACER_MASK_SHADOW 0x04 // Whether the geometry is visible for shadow rays
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#define PATHTRACER_MASK_HAIR_SHADOW 0x08 // Whether hair is visible for shadow rays
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#define PATHTRACER_MASK_INDIRECT 0x10 // opaque and alpha tested meshes and particles as a whole (indirect ray) excluding hairs
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#define PATHTRACER_MASK_HAIR_INDIRECT 0x20 // For indirect ray tracing against hair
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#define PATHTRACER_MASK_EMPTY_SLOT1 0x40
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#define PATHTRACER_MASK_EMPTY_SLOT2 0x80
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#define PATHTRACER_MASK_IGNORE 0x00 // used when mapping general tracing mask to path tracing mask
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#define PATHTRACER_MASK_UNUSED (PATHTRACER_MASK_EMPTY_SLOT1|PATHTRACER_MASK_EMPTY_SLOT2)
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#define PATHTRACER_MASK_ALL 0xFF
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// Constants for light contribution types (AOV decomposition of the image)
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// Leaving all constants enabled creates the beauty image, but turning off some bits allows
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// the path tracer to create an image with only certain components enabled
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#define PATHTRACER_CONTRIBUTION_EMISSIVE 1
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#define PATHTRACER_CONTRIBUTION_DIFFUSE 2
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#define PATHTRACER_CONTRIBUTION_SPECULAR 4
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#define PATHTRACER_CONTRIBUTION_VOLUME 8
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// Constants for the path tracer light grid
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#define PATHTRACER_LIGHT_GRID_SINGULAR_MASK 0x80000000u
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#define PATHTRACER_LIGHT_GRID_LIGHT_COUNT_MASK 0x7FFFFFFFu
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// Constants for the energy conservation texture sizes
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#define PATHTRACER_ENERGY_TABLE_RESOLUTION 32
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// Constants related to volumetric support
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#define VOLUMEID_ATMOSPHERE 0
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#define VOLUMEID_FOG 1
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#define VOLUMEID_HETEROGENEOUS_VOLUMES 2
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#define PATH_TRACER_MAX_VOLUMES 3
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#define PATH_TRACER_VOLUME_ENABLE_BIT (1u)
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#define PATH_TRACER_VOLUME_ENABLE_ATMOSPHERE (PATH_TRACER_VOLUME_ENABLE_BIT << VOLUMEID_ATMOSPHERE)
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#define PATH_TRACER_VOLUME_ENABLE_FOG (PATH_TRACER_VOLUME_ENABLE_BIT << VOLUMEID_FOG)
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#define PATH_TRACER_VOLUME_ENABLE_HETEROGENEOUS_VOLUMES (PATH_TRACER_VOLUME_ENABLE_BIT << VOLUMEID_HETEROGENEOUS_VOLUMES)
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#define PATH_TRACER_VOLUME_HOLDOUT_BIT (PATH_TRACER_VOLUME_ENABLE_BIT << PATH_TRACER_MAX_VOLUMES)
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#define PATH_TRACER_VOLUME_HOLDOUT_ATMOSPHERE (PATH_TRACER_VOLUME_HOLDOUT_BIT << VOLUMEID_ATMOSPHERE)
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#define PATH_TRACER_VOLUME_HOLDOUT_FOG (PATH_TRACER_VOLUME_HOLDOUT_BIT << VOLUMEID_FOG)
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#define PATH_TRACER_VOLUME_HOLDOUT_HETEROGENEOUS_VOLUMES (PATH_TRACER_VOLUME_HOLDOUT_BIT << VOLUMEID_HETEROGENEOUS_VOLUMES)
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#define PATH_TRACER_VOLUME_USE_ANALYTIC_TRANSMITTANCE (PATH_TRACER_VOLUME_HOLDOUT_BIT << PATH_TRACER_MAX_VOLUMES)
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