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0c3005ca0cb8a8637b6d00a12e1f4b4caa75d658
test2/intern/cycles/kernel/svm/svm.h
Sergey Sharybin dcae48d1d3 Cycles: Add Portal Depth light pass information 
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
2025-07-25 18:09:38 +02:00

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/* SPDX-FileCopyrightText: 2011-2022 Blender Foundation
*
* SPDX-License-Identifier: Apache-2.0 */
#pragma once
/* Shader Virtual Machine
*
* A shader is a list of nodes to be executed. These are simply read one after
* the other and executed, using an node counter. Each node and its associated
* data is encoded as one or more uint4's in a 1D texture. If the data is larger
* than an uint4, the node can increase the node counter to compensate for this.
* Floats are encoded as int and then converted to float again.
*
* Nodes write their output into a stack. All stack data in the stack is
* floats, since it's all factors, colors and vectors. The stack will be stored
* in local memory on the GPU, as it would take too many register and indexes in
* ways not known at compile time. This seems the only solution even though it
* may be slow, with two positive factors. If the same shader is being executed,
* memory access will be coalesced and cached.
*
* The result of shader execution will be a single closure. This means the
* closure type, associated label, data and weight. Sampling from multiple
* closures is supported through the mix closure node, the logic for that is
* mostly taken care of in the SVM compiler.
*/
#include "kernel/globals.h"
#include "kernel/types.h"
#include "kernel/svm/types.h"
#include "kernel/svm/util.h"
/* Nodes */
#include "kernel/svm/aov.h"
#include "kernel/svm/attribute.h"
#include "kernel/svm/blackbody.h"
#include "kernel/svm/brick.h"
#include "kernel/svm/brightness.h"
#include "kernel/svm/bump.h"
#include "kernel/svm/camera.h"
#include "kernel/svm/checker.h"
#include "kernel/svm/clamp.h"
#include "kernel/svm/closure.h"
#include "kernel/svm/convert.h"
#include "kernel/svm/displace.h"
#include "kernel/svm/fresnel.h"
#include "kernel/svm/gabor.h"
#include "kernel/svm/gamma.h"
#include "kernel/svm/geometry.h"
#include "kernel/svm/gradient.h"
#include "kernel/svm/hsv.h"
#include "kernel/svm/ies.h"
#include "kernel/svm/image.h"
#include "kernel/svm/invert.h"
#include "kernel/svm/light_path.h"
#include "kernel/svm/magic.h"
#include "kernel/svm/map_range.h"
#include "kernel/svm/mapping.h"
#include "kernel/svm/math.h"
#include "kernel/svm/mix.h"
#include "kernel/svm/noisetex.h"
#include "kernel/svm/normal.h"
#include "kernel/svm/ramp.h"
#include "kernel/svm/sepcomb_color.h"
#include "kernel/svm/sepcomb_vector.h"
#include "kernel/svm/sky.h"
#include "kernel/svm/tex_coord.h"
#include "kernel/svm/value.h"
#include "kernel/svm/vector_rotate.h"
#include "kernel/svm/vector_transform.h"
#include "kernel/svm/vertex_color.h"
#include "kernel/svm/voronoi.h"
#include "kernel/svm/wave.h"
#include "kernel/svm/wavelength.h"
#include "kernel/svm/white_noise.h"
#include "kernel/svm/wireframe.h"
#ifdef __SHADER_RAYTRACE__
# include "kernel/svm/ao.h"
# include "kernel/svm/bevel.h"
#endif
CCL_NAMESPACE_BEGIN
#ifdef __KERNEL_USE_DATA_CONSTANTS__
# define SVM_CASE(node) \
case node: \
if (!kernel_data_svm_usage_##node) \
break;
#else
# define SVM_CASE(node) case node:
#endif
/* Main Interpreter Loop */
template<uint node_feature_mask, ShaderType type, typename ConstIntegratorGenericState>
ccl_device void svm_eval_nodes(KernelGlobals kg,
ConstIntegratorGenericState state,
ccl_private ShaderData *sd,
ccl_global float *render_buffer,
const uint32_t path_flag)
{
float stack[SVM_STACK_SIZE];
Spectrum closure_weight;
int offset = sd->shader & SHADER_MASK;
while (true) {
uint4 node = read_node(kg, &offset);
switch (node.x) {
SVM_CASE(NODE_END)
return;
SVM_CASE(NODE_SHADER_JUMP)
{
if (type == SHADER_TYPE_SURFACE) {
offset = node.y;
}
else if (type == SHADER_TYPE_VOLUME) {
offset = node.z;
}
else if (type == SHADER_TYPE_DISPLACEMENT) {
offset = node.w;
}
else {
return;
}
break;
}
SVM_CASE(NODE_CLOSURE_BSDF)
offset = svm_node_closure_bsdf<node_feature_mask, type>(
kg, sd, stack, closure_weight, node, path_flag, offset);
break;
SVM_CASE(NODE_CLOSURE_EMISSION)
IF_KERNEL_NODES_FEATURE(EMISSION)
{
svm_node_closure_emission(kg, sd, stack, closure_weight, node);
}
break;
SVM_CASE(NODE_CLOSURE_BACKGROUND)
IF_KERNEL_NODES_FEATURE(EMISSION)
{
svm_node_closure_background(sd, stack, closure_weight, node);
}
break;
SVM_CASE(NODE_CLOSURE_SET_WEIGHT)
svm_node_closure_set_weight(&closure_weight, node.y, node.z, node.w);
break;
SVM_CASE(NODE_CLOSURE_WEIGHT)
svm_node_closure_weight(stack, &closure_weight, node.y);
break;
SVM_CASE(NODE_EMISSION_WEIGHT)
IF_KERNEL_NODES_FEATURE(EMISSION)
{
svm_node_emission_weight(stack, &closure_weight, node);
}
break;
SVM_CASE(NODE_MIX_CLOSURE)
svm_node_mix_closure(stack, node);
break;
SVM_CASE(NODE_JUMP_IF_ZERO)
if (stack_load_float(stack, node.z) <= 0.0f) {
offset += node.y;
}
break;
SVM_CASE(NODE_JUMP_IF_ONE)
if (stack_load_float(stack, node.z) >= 1.0f) {
offset += node.y;
}
break;
SVM_CASE(NODE_GEOMETRY)
svm_node_geometry(kg, sd, stack, node.y, node.z);
break;
SVM_CASE(NODE_CONVERT)
svm_node_convert(kg, stack, node.y, node.z, node.w);
break;
SVM_CASE(NODE_TEX_COORD)
offset = svm_node_tex_coord(kg, sd, path_flag, stack, node, offset);
break;
SVM_CASE(NODE_VALUE_F)
svm_node_value_f(stack, node.y, node.z);
break;
SVM_CASE(NODE_VALUE_V)
offset = svm_node_value_v(kg, stack, node.y, offset);
break;
SVM_CASE(NODE_ATTR)
svm_node_attr<node_feature_mask>(kg, sd, stack, node);
break;
SVM_CASE(NODE_VERTEX_COLOR)
svm_node_vertex_color(kg, sd, stack, node);
break;
SVM_CASE(NODE_GEOMETRY_BUMP_DX)
IF_KERNEL_NODES_FEATURE(BUMP)
{
svm_node_geometry_bump_dx(kg, sd, stack, node.y, node.z, __uint_as_float(node.w));
}
break;
SVM_CASE(NODE_GEOMETRY_BUMP_DY)
IF_KERNEL_NODES_FEATURE(BUMP)
{
svm_node_geometry_bump_dy(kg, sd, stack, node.y, node.z, __uint_as_float(node.w));
}
break;
SVM_CASE(NODE_SET_DISPLACEMENT)
svm_node_set_displacement<node_feature_mask>(sd, stack, node.y);
break;
SVM_CASE(NODE_DISPLACEMENT)
svm_node_displacement<node_feature_mask>(kg, sd, stack, node);
break;
SVM_CASE(NODE_VECTOR_DISPLACEMENT)
offset = svm_node_vector_displacement<node_feature_mask>(kg, sd, stack, node, offset);
break;
SVM_CASE(NODE_TEX_IMAGE)
offset = svm_node_tex_image(kg, sd, stack, node, offset);
break;
SVM_CASE(NODE_TEX_IMAGE_BOX)
svm_node_tex_image_box(kg, sd, stack, node);
break;
SVM_CASE(NODE_TEX_NOISE)
offset = svm_node_tex_noise(kg, stack, node.y, node.z, node.w, offset);
break;
SVM_CASE(NODE_SET_BUMP)
offset = svm_node_set_bump<node_feature_mask>(kg, sd, stack, node, offset);
break;
SVM_CASE(NODE_ATTR_BUMP_DX)
IF_KERNEL_NODES_FEATURE(BUMP)
{
svm_node_attr_bump_dx(kg, sd, stack, node);
}
break;
SVM_CASE(NODE_ATTR_BUMP_DY)
IF_KERNEL_NODES_FEATURE(BUMP)
{
svm_node_attr_bump_dy(kg, sd, stack, node);
}
break;
SVM_CASE(NODE_VERTEX_COLOR_BUMP_DX)
IF_KERNEL_NODES_FEATURE(BUMP)
{
svm_node_vertex_color_bump_dx(kg, sd, stack, node);
}
break;
SVM_CASE(NODE_VERTEX_COLOR_BUMP_DY)
IF_KERNEL_NODES_FEATURE(BUMP)
{
svm_node_vertex_color_bump_dy(kg, sd, stack, node);
}
break;
SVM_CASE(NODE_TEX_COORD_BUMP_DX)
IF_KERNEL_NODES_FEATURE(BUMP)
{
offset = svm_node_tex_coord_bump_dx(kg, sd, path_flag, stack, node, offset);
}
break;
SVM_CASE(NODE_TEX_COORD_BUMP_DY)
IF_KERNEL_NODES_FEATURE(BUMP)
{
offset = svm_node_tex_coord_bump_dy(kg, sd, path_flag, stack, node, offset);
}
break;
SVM_CASE(NODE_CLOSURE_SET_NORMAL)
IF_KERNEL_NODES_FEATURE(BUMP)
{
svm_node_set_normal(sd, stack, node.y, node.z);
}
break;
SVM_CASE(NODE_ENTER_BUMP_EVAL)
IF_KERNEL_NODES_FEATURE(BUMP_STATE)
{
svm_node_enter_bump_eval(kg, sd, stack, node.y);
}
break;
SVM_CASE(NODE_LEAVE_BUMP_EVAL)
IF_KERNEL_NODES_FEATURE(BUMP_STATE)
{
svm_node_leave_bump_eval(sd, stack, node.y);
}
break;
SVM_CASE(NODE_HSV)
svm_node_hsv(stack, node);
break;
SVM_CASE(NODE_CLOSURE_HOLDOUT)
svm_node_closure_holdout(sd, stack, closure_weight, node);
break;
SVM_CASE(NODE_FRESNEL)
svm_node_fresnel(sd, stack, node.y, node.z, node.w);
break;
SVM_CASE(NODE_LAYER_WEIGHT)
svm_node_layer_weight(sd, stack, node);
break;
SVM_CASE(NODE_CLOSURE_VOLUME)
IF_KERNEL_NODES_FEATURE(VOLUME)
{
svm_node_closure_volume<type>(kg, sd, stack, closure_weight, node);
}
break;
SVM_CASE(NODE_VOLUME_COEFFICIENTS)
IF_KERNEL_NODES_FEATURE(VOLUME)
{
svm_node_volume_coefficients<type>(kg, sd, stack, closure_weight, node, path_flag);
}
break;
SVM_CASE(NODE_PRINCIPLED_VOLUME)
IF_KERNEL_NODES_FEATURE(VOLUME)
{
offset = svm_node_principled_volume<type>(
kg, sd, stack, closure_weight, node, path_flag, offset);
}
break;
SVM_CASE(NODE_MATH)
svm_node_math(stack, node.y, node.z, node.w);
break;
SVM_CASE(NODE_VECTOR_MATH)
offset = svm_node_vector_math(kg, stack, node.y, node.z, node.w, offset);
break;
SVM_CASE(NODE_RGB_RAMP)
offset = svm_node_rgb_ramp(kg, stack, node, offset);
break;
SVM_CASE(NODE_GAMMA)
svm_node_gamma(stack, node.y, node.z, node.w);
break;
SVM_CASE(NODE_BRIGHTCONTRAST)
svm_node_brightness(stack, node.y, node.z, node.w);
break;
SVM_CASE(NODE_LIGHT_PATH)
svm_node_light_path<node_feature_mask>(kg, state, sd, stack, node.y, node.z, path_flag);
break;
SVM_CASE(NODE_OBJECT_INFO)
svm_node_object_info(kg, sd, stack, node.y, node.z);
break;
SVM_CASE(NODE_PARTICLE_INFO)
svm_node_particle_info(kg, sd, stack, node.y, node.z);
break;
#if defined(__HAIR__)
SVM_CASE(NODE_HAIR_INFO)
svm_node_hair_info(kg, sd, stack, node.y, node.z);
break;
#endif
#if defined(__POINTCLOUD__)
SVM_CASE(NODE_POINT_INFO)
svm_node_point_info(kg, sd, stack, node.y, node.z);
break;
#endif
SVM_CASE(NODE_TEXTURE_MAPPING)
offset = svm_node_texture_mapping(kg, stack, node.y, node.z, offset);
break;
SVM_CASE(NODE_MAPPING)
svm_node_mapping(stack, node.y, node.z, node.w);
break;
SVM_CASE(NODE_MIN_MAX)
offset = svm_node_min_max(kg, stack, node.y, node.z, offset);
break;
SVM_CASE(NODE_CAMERA)
svm_node_camera(kg, sd, stack, node.y, node.z, node.w);
break;
SVM_CASE(NODE_TEX_ENVIRONMENT)
svm_node_tex_environment(kg, sd, stack, node);
break;
SVM_CASE(NODE_TEX_SKY)
offset = svm_node_tex_sky(kg, path_flag, stack, node, offset);
break;
SVM_CASE(NODE_TEX_GRADIENT)
svm_node_tex_gradient(stack, node);
break;
SVM_CASE(NODE_TEX_VORONOI)
offset = svm_node_tex_voronoi<node_feature_mask>(kg, stack, node.y, node.z, node.w, offset);
break;
SVM_CASE(NODE_TEX_GABOR)
offset = svm_node_tex_gabor(kg, stack, node.y, node.z, node.w, offset);
break;
SVM_CASE(NODE_TEX_WAVE)
offset = svm_node_tex_wave(kg, stack, node, offset);
break;
SVM_CASE(NODE_TEX_MAGIC)
offset = svm_node_tex_magic(kg, stack, node, offset);
break;
SVM_CASE(NODE_TEX_CHECKER)
svm_node_tex_checker(stack, node);
break;
SVM_CASE(NODE_TEX_BRICK)
offset = svm_node_tex_brick(kg, stack, node, offset);
break;
SVM_CASE(NODE_TEX_WHITE_NOISE)
svm_node_tex_white_noise(stack, node.y, node.z, node.w);
break;
SVM_CASE(NODE_NORMAL)
offset = svm_node_normal(kg, stack, node.y, node.z, node.w, offset);
break;
SVM_CASE(NODE_LIGHT_FALLOFF)
svm_node_light_falloff(sd, stack, node);
break;
SVM_CASE(NODE_IES)
svm_node_ies(kg, sd, stack, node);
break;
SVM_CASE(NODE_CURVES)
offset = svm_node_curves(kg, stack, node, offset);
break;
SVM_CASE(NODE_FLOAT_CURVE)
offset = svm_node_curve(kg, stack, node, offset);
break;
SVM_CASE(NODE_TANGENT)
svm_node_tangent(kg, sd, stack, node);
break;
SVM_CASE(NODE_NORMAL_MAP)
svm_node_normal_map(kg, sd, stack, node);
break;
SVM_CASE(NODE_INVERT)
svm_node_invert(stack, node.y, node.z, node.w);
break;
SVM_CASE(NODE_MIX)
offset = svm_node_mix(kg, stack, node.y, node.z, node.w, offset);
break;
SVM_CASE(NODE_SEPARATE_COLOR)
svm_node_separate_color(stack, node.y, node.z, node.w);
break;
SVM_CASE(NODE_COMBINE_COLOR)
svm_node_combine_color(stack, node.y, node.z, node.w);
break;
SVM_CASE(NODE_SEPARATE_VECTOR)
svm_node_separate_vector(stack, node.y, node.z, node.w);
break;
SVM_CASE(NODE_COMBINE_VECTOR)
svm_node_combine_vector(stack, node.y, node.z, node.w);
break;
SVM_CASE(NODE_VECTOR_ROTATE)
svm_node_vector_rotate(stack, node.y, node.z, node.w);
break;
SVM_CASE(NODE_VECTOR_TRANSFORM)
svm_node_vector_transform(kg, sd, stack, node);
break;
SVM_CASE(NODE_WIREFRAME)
svm_node_wireframe(kg, sd, stack, node);
break;
SVM_CASE(NODE_WAVELENGTH)
svm_node_wavelength(kg, stack, node.y, node.z);
break;
SVM_CASE(NODE_BLACKBODY)
svm_node_blackbody(kg, stack, node.y, node.z);
break;
SVM_CASE(NODE_MAP_RANGE)
offset = svm_node_map_range(kg, stack, node.y, node.z, node.w, offset);
break;
SVM_CASE(NODE_VECTOR_MAP_RANGE)
offset = svm_node_vector_map_range(stack, node.y, node.z, node.w, offset);
break;
SVM_CASE(NODE_CLAMP)
offset = svm_node_clamp(kg, stack, node.y, node.z, node.w, offset);
break;
#ifdef __SHADER_RAYTRACE__
SVM_CASE(NODE_BEVEL)
svm_node_bevel<node_feature_mask>(kg, state, sd, stack, node);
break;
SVM_CASE(NODE_AMBIENT_OCCLUSION)
svm_node_ao<node_feature_mask>(kg, state, sd, stack, node);
break;
#endif
SVM_CASE(NODE_AOV_START)
if (!svm_node_aov_check(path_flag, render_buffer)) {
return;
}
break;
SVM_CASE(NODE_AOV_COLOR)
svm_node_aov_color<node_feature_mask>(kg, state, stack, node, render_buffer);
break;
SVM_CASE(NODE_AOV_VALUE)
svm_node_aov_value<node_feature_mask>(kg, state, stack, node, render_buffer);
break;
SVM_CASE(NODE_MIX_COLOR)
svm_node_mix_color(stack, node.y, node.z, node.w);
break;
SVM_CASE(NODE_MIX_FLOAT)
svm_node_mix_float(stack, node.y, node.z, node.w);
break;
SVM_CASE(NODE_MIX_VECTOR)
svm_node_mix_vector(stack, node.y, node.z);
break;
SVM_CASE(NODE_MIX_VECTOR_NON_UNIFORM)
svm_node_mix_vector_non_uniform(stack, node.y, node.z);
break;
default:
kernel_assert(!"Unknown node type was passed to the SVM machine");
return;
}
}
}
CCL_NAMESPACE_END
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