dcae48d1d3
It allows to implement tricks based on a knowledge whether the path ever cam through a portal or not, and even something more advanced based on the number of portals. The main current objective is for strokes shading: stroke shader uses Ray Portal BSDF to place ray to the center of the stroke and point it in the direction of the surface it is generated for. This gives stroke a single color which matches shading of the original object. For this usecase to work the ray bounced from the original surface should ignore the strokes, which is now possible by using Portal Depth input and mixing with the Transparent BSDF. It also helps to make shading look better when there are multiple stroke layers. A solution of using portal depth is chosen over a single flag due to various factors: - Last time we've looked into it it was a bit tricky to implement as a flag due to us running out of bits. - It feels to be more flexible solution, even though it is a bit hard to come up with 100% compelling setup for it. - It needs to be slightly different from the current "Is Foo" flags, and be more "Is Portal Descendant" or something. An extra uint16 is added to the state to count the portal depth, but it is only allocated for scenes that use Ray Portal BSDF. Portal BSDF still increments Transparent bounce, as it is required to have some "limiting" factor so that ray does not get infinitely move to different place of the scene. Ref #125213 Pull Request: https://projects.blender.org/blender/blender/pulls/143107
151 lines
8.4 KiB
C
151 lines
8.4 KiB
C
/* SPDX-FileCopyrightText: 2011-2022 Blender Foundation
|
|
*
|
|
* SPDX-License-Identifier: Apache-2.0 */
|
|
|
|
/************************************ Path State *****************************/
|
|
|
|
KERNEL_STRUCT_BEGIN(path)
|
|
/* Index of a pixel within the device render buffer where this path will write its result.
|
|
* To get an actual offset within the buffer the value needs to be multiplied by the
|
|
* `kernel_data.film.pass_stride`.
|
|
*
|
|
* The multiplication is delayed for later, so that state can use 32bit integer. */
|
|
KERNEL_STRUCT_MEMBER(path, uint32_t, render_pixel_index, KERNEL_FEATURE_PATH_TRACING)
|
|
/* Current sample number. */
|
|
KERNEL_STRUCT_MEMBER(path, uint32_t, sample, KERNEL_FEATURE_PATH_TRACING)
|
|
/* Current ray bounce depth. */
|
|
KERNEL_STRUCT_MEMBER(path, uint16_t, bounce, KERNEL_FEATURE_PATH_TRACING)
|
|
/* Current transparent ray bounce depth. */
|
|
KERNEL_STRUCT_MEMBER(path, uint16_t, transparent_bounce, KERNEL_FEATURE_PATH_TRACING)
|
|
/* Current diffuse ray bounce depth. */
|
|
KERNEL_STRUCT_MEMBER(path, uint16_t, diffuse_bounce, KERNEL_FEATURE_PATH_TRACING)
|
|
/* Current glossy ray bounce depth. */
|
|
KERNEL_STRUCT_MEMBER(path, uint16_t, glossy_bounce, KERNEL_FEATURE_PATH_TRACING)
|
|
/* Current transmission ray bounce depth. */
|
|
KERNEL_STRUCT_MEMBER(path, uint16_t, transmission_bounce, KERNEL_FEATURE_PATH_TRACING)
|
|
/* Current volume ray bounce depth. */
|
|
KERNEL_STRUCT_MEMBER(path, uint16_t, volume_bounce, KERNEL_FEATURE_PATH_TRACING)
|
|
/* Current volume bounds ray bounce depth. */
|
|
KERNEL_STRUCT_MEMBER(path, uint16_t, volume_bounds_bounce, KERNEL_FEATURE_PATH_TRACING)
|
|
/* Current portal ray bounce depth. */
|
|
KERNEL_STRUCT_MEMBER(path, uint16_t, portal_bounce, KERNEL_FEATURE_NODE_PORTAL)
|
|
/* DeviceKernel bit indicating queued kernels. */
|
|
KERNEL_STRUCT_MEMBER(path, uint16_t, queued_kernel, KERNEL_FEATURE_PATH_TRACING)
|
|
/* Random number generator per-pixel info. */
|
|
KERNEL_STRUCT_MEMBER(path, uint32_t, rng_pixel, KERNEL_FEATURE_PATH_TRACING)
|
|
/* Random number dimension offset. */
|
|
KERNEL_STRUCT_MEMBER(path, uint16_t, rng_offset, KERNEL_FEATURE_PATH_TRACING)
|
|
/* enum PathRayFlag */
|
|
KERNEL_STRUCT_MEMBER(path, uint32_t, flag, KERNEL_FEATURE_PATH_TRACING)
|
|
/* enum PathRayMNEE */
|
|
KERNEL_STRUCT_MEMBER(path, uint8_t, mnee, KERNEL_FEATURE_PATH_TRACING)
|
|
/* Multiple importance sampling
|
|
* The PDF of BSDF sampling at the last scatter point, which is at ray distance
|
|
* zero and distance. Note that transparency and volume attenuation increase
|
|
* the ray tmin but keep P unmodified so that this works. */
|
|
KERNEL_STRUCT_MEMBER(path, float, mis_ray_pdf, KERNEL_FEATURE_PATH_TRACING)
|
|
/* Object at last scatter point for light linking. */
|
|
KERNEL_STRUCT_MEMBER(path, int, mis_ray_object, KERNEL_FEATURE_LIGHT_LINKING)
|
|
/* Normal at last scatter point for light tree. */
|
|
KERNEL_STRUCT_MEMBER(path, packed_float3, mis_origin_n, KERNEL_FEATURE_PATH_TRACING)
|
|
/* Filter glossy. */
|
|
KERNEL_STRUCT_MEMBER(path, float, min_ray_pdf, KERNEL_FEATURE_PATH_TRACING)
|
|
/* Continuation probability for path termination. */
|
|
KERNEL_STRUCT_MEMBER(path, float, continuation_probability, KERNEL_FEATURE_PATH_TRACING)
|
|
/* Throughput. */
|
|
KERNEL_STRUCT_MEMBER(path, PackedSpectrum, throughput, KERNEL_FEATURE_PATH_TRACING)
|
|
/* Factor to multiple with throughput to get remove any guiding PDFS.
|
|
* Such throughput without guiding PDFS is used for Russian roulette termination. */
|
|
KERNEL_STRUCT_MEMBER(path, float, unguided_throughput, KERNEL_FEATURE_PATH_GUIDING)
|
|
/* Ratio of throughput to distinguish diffuse / glossy / transmission render passes. */
|
|
KERNEL_STRUCT_MEMBER(path, PackedSpectrum, pass_diffuse_weight, KERNEL_FEATURE_LIGHT_PASSES)
|
|
KERNEL_STRUCT_MEMBER(path, PackedSpectrum, pass_glossy_weight, KERNEL_FEATURE_LIGHT_PASSES)
|
|
/* Denoising. */
|
|
KERNEL_STRUCT_MEMBER(path, PackedSpectrum, denoising_feature_throughput, KERNEL_FEATURE_DENOISING)
|
|
/* Shader sorting. */
|
|
/* TODO: compress as uint16? or leave out entirely and recompute key in sorting code? */
|
|
KERNEL_STRUCT_MEMBER(path, uint32_t, shader_sort_key, KERNEL_FEATURE_PATH_TRACING)
|
|
KERNEL_STRUCT_END(path)
|
|
|
|
/************************************** Ray ***********************************/
|
|
|
|
KERNEL_STRUCT_BEGIN_PACKED(ray, KERNEL_FEATURE_PATH_TRACING)
|
|
KERNEL_STRUCT_MEMBER_PACKED(ray, packed_float3, P, KERNEL_FEATURE_PATH_TRACING)
|
|
KERNEL_STRUCT_MEMBER_PACKED(ray, float, dP, KERNEL_FEATURE_PATH_TRACING)
|
|
KERNEL_STRUCT_MEMBER_PACKED(ray, packed_float3, D, KERNEL_FEATURE_PATH_TRACING)
|
|
KERNEL_STRUCT_MEMBER_PACKED(ray, float, dD, KERNEL_FEATURE_PATH_TRACING)
|
|
KERNEL_STRUCT_MEMBER_PACKED(ray, float, tmin, KERNEL_FEATURE_PATH_TRACING)
|
|
KERNEL_STRUCT_MEMBER_PACKED(ray, float, tmax, KERNEL_FEATURE_PATH_TRACING)
|
|
KERNEL_STRUCT_MEMBER_PACKED(ray, float, time, KERNEL_FEATURE_PATH_TRACING)
|
|
KERNEL_STRUCT_MEMBER(ray, float, previous_dt, KERNEL_FEATURE_LIGHT_TREE)
|
|
KERNEL_STRUCT_END(ray)
|
|
|
|
/*************************** Intersection result ******************************/
|
|
|
|
/* Result from scene intersection. */
|
|
KERNEL_STRUCT_BEGIN_PACKED(isect, KERNEL_FEATURE_PATH_TRACING)
|
|
KERNEL_STRUCT_MEMBER_PACKED(isect, float, t, KERNEL_FEATURE_PATH_TRACING)
|
|
KERNEL_STRUCT_MEMBER_PACKED(isect, float, u, KERNEL_FEATURE_PATH_TRACING)
|
|
KERNEL_STRUCT_MEMBER_PACKED(isect, float, v, KERNEL_FEATURE_PATH_TRACING)
|
|
KERNEL_STRUCT_MEMBER_PACKED(isect, int, prim, KERNEL_FEATURE_PATH_TRACING)
|
|
KERNEL_STRUCT_MEMBER_PACKED(isect, int, object, KERNEL_FEATURE_PATH_TRACING)
|
|
KERNEL_STRUCT_MEMBER_PACKED(isect, int, type, KERNEL_FEATURE_PATH_TRACING)
|
|
KERNEL_STRUCT_END(isect)
|
|
|
|
/*************** Subsurface closure state for subsurface kernel ***************/
|
|
|
|
KERNEL_STRUCT_BEGIN_PACKED(subsurface, KERNEL_FEATURE_SUBSURFACE)
|
|
KERNEL_STRUCT_MEMBER_PACKED(subsurface, PackedSpectrum, albedo, KERNEL_FEATURE_SUBSURFACE)
|
|
KERNEL_STRUCT_MEMBER_PACKED(subsurface, PackedSpectrum, radius, KERNEL_FEATURE_SUBSURFACE)
|
|
KERNEL_STRUCT_MEMBER_PACKED(subsurface, float, anisotropy, KERNEL_FEATURE_SUBSURFACE)
|
|
KERNEL_STRUCT_MEMBER_PACKED(subsurface, packed_float3, N, KERNEL_FEATURE_SUBSURFACE)
|
|
KERNEL_STRUCT_END(subsurface)
|
|
|
|
/********************************** Volume Stack ******************************/
|
|
|
|
KERNEL_STRUCT_BEGIN(volume_stack)
|
|
KERNEL_STRUCT_ARRAY_MEMBER(volume_stack, int, object, KERNEL_FEATURE_VOLUME)
|
|
KERNEL_STRUCT_ARRAY_MEMBER(volume_stack, int, shader, KERNEL_FEATURE_VOLUME)
|
|
KERNEL_STRUCT_END_ARRAY(volume_stack,
|
|
KERNEL_STRUCT_VOLUME_STACK_SIZE,
|
|
KERNEL_STRUCT_VOLUME_STACK_SIZE)
|
|
|
|
/************************************ Path Guiding *****************************/
|
|
KERNEL_STRUCT_BEGIN(guiding)
|
|
#if defined(__PATH_GUIDING__)
|
|
/* Current path segment of the random walk/path. */
|
|
KERNEL_STRUCT_MEMBER(guiding,
|
|
openpgl::cpp::PathSegment *,
|
|
path_segment,
|
|
KERNEL_FEATURE_PATH_GUIDING)
|
|
#else
|
|
/* Current path segment of the random walk/path. */
|
|
KERNEL_STRUCT_MEMBER(guiding, uint64_t, path_segment, KERNEL_FEATURE_PATH_GUIDING)
|
|
#endif
|
|
/* If surface guiding is enabled */
|
|
KERNEL_STRUCT_MEMBER(guiding, bool, use_surface_guiding, KERNEL_FEATURE_PATH_GUIDING)
|
|
/* Random number used for additional guiding decisions (e.g., cache query, selection to use guiding
|
|
* or BSDF sampling) */
|
|
KERNEL_STRUCT_MEMBER(guiding, float, sample_surface_guiding_rand, KERNEL_FEATURE_PATH_GUIDING)
|
|
/* The probability to use surface guiding (i.e., diffuse sampling prob * guiding prob)*/
|
|
KERNEL_STRUCT_MEMBER(guiding, float, surface_guiding_sampling_prob, KERNEL_FEATURE_PATH_GUIDING)
|
|
/* Probability of sampling a BSSRDF closure instead of a BSDF closure. */
|
|
KERNEL_STRUCT_MEMBER(guiding, float, bssrdf_sampling_prob, KERNEL_FEATURE_PATH_GUIDING)
|
|
/* If volume guiding is enabled */
|
|
KERNEL_STRUCT_MEMBER(guiding, bool, use_volume_guiding, KERNEL_FEATURE_PATH_GUIDING)
|
|
/* Random number used for additional guiding decisions (e.g., cache query, selection to use guiding
|
|
* or BSDF sampling) */
|
|
KERNEL_STRUCT_MEMBER(guiding, float, sample_volume_guiding_rand, KERNEL_FEATURE_PATH_GUIDING)
|
|
/* The probability to use surface guiding (i.e., diffuse sampling prob * guiding prob). */
|
|
KERNEL_STRUCT_MEMBER(guiding, float, volume_guiding_sampling_prob, KERNEL_FEATURE_PATH_GUIDING)
|
|
KERNEL_STRUCT_END(guiding)
|
|
|
|
/******************************* Shadow linking *******************************/
|
|
|
|
KERNEL_STRUCT_BEGIN(shadow_link)
|
|
KERNEL_STRUCT_MEMBER(shadow_link, float, dedicated_light_weight, KERNEL_FEATURE_SHADOW_LINKING)
|
|
/* Copy of primitive and object from the last main path intersection. */
|
|
KERNEL_STRUCT_MEMBER(shadow_link, int, last_isect_prim, KERNEL_FEATURE_SHADOW_LINKING)
|
|
KERNEL_STRUCT_MEMBER(shadow_link, int, last_isect_object, KERNEL_FEATURE_SHADOW_LINKING)
|
|
KERNEL_STRUCT_END(shadow_link)
|