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blender/intern/cycles/render/light.cpp
Kévin Dietrich aa1e4baa22 Cycles : add a Volume Geometry Node 
This splits the volume related data (properties for rendering and attributes) of the Mesh node
into a new `Volume` node type.

This `Volume` node derives from the `Mesh` class since we generate a mesh for the bounds of the
volume, as such we can safely work on `Volumes` as if they were `Meshes`, e.g. for BVH creation.
However such code should still check for the geometry type of the object to be `MESH` or `VOLUME`
which may be bug prone if this is forgotten.

This is part of T79131.

Reviewed By: brecht

Maniphest Tasks: T79131

Differential Revision: https://developer.blender.org/D8538
2020-08-19 15:47:09 +02:00

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/*
* Copyright 2011-2013 Blender Foundation
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
#include "render/light.h"
#include "device/device.h"
#include "render/background.h"
#include "render/film.h"
#include "render/graph.h"
#include "render/integrator.h"
#include "render/mesh.h"
#include "render/nodes.h"
#include "render/object.h"
#include "render/scene.h"
#include "render/shader.h"
#include "util/util_foreach.h"
#include "util/util_hash.h"
#include "util/util_logging.h"
#include "util/util_path.h"
#include "util/util_progress.h"
#include "util/util_task.h"
CCL_NAMESPACE_BEGIN
static void shade_background_pixels(Device *device,
DeviceScene *dscene,
int width,
int height,
vector<float3> &pixels,
Progress &progress)
{
/* create input */
device_vector<uint4> d_input(device, "background_input", MEM_READ_ONLY);
device_vector<float4> d_output(device, "background_output", MEM_READ_WRITE);
uint4 *d_input_data = d_input.alloc(width * height);
for (int y = 0; y < height; y++) {
for (int x = 0; x < width; x++) {
float u = (x + 0.5f) / width;
float v = (y + 0.5f) / height;
uint4 in = make_uint4(__float_as_int(u), __float_as_int(v), 0, 0);
d_input_data[x + y * width] = in;
}
}
/* compute on device */
d_output.alloc(width * height);
d_output.zero_to_device();
d_input.copy_to_device();
device->const_copy_to("__data", &dscene->data, sizeof(dscene->data));
DeviceTask main_task(DeviceTask::SHADER);
main_task.shader_input = d_input.device_pointer;
main_task.shader_output = d_output.device_pointer;
main_task.shader_eval_type = SHADER_EVAL_BACKGROUND;
main_task.shader_x = 0;
main_task.shader_w = width * height;
main_task.num_samples = 1;
main_task.get_cancel = function_bind(&Progress::get_cancel, &progress);
/* disabled splitting for now, there's an issue with multi-GPU mem_copy_from */
list<DeviceTask> split_tasks;
main_task.split(split_tasks, 1, 128 * 128);
foreach (DeviceTask &task, split_tasks) {
device->task_add(task);
device->task_wait();
d_output.copy_from_device(task.shader_x, 1, task.shader_w);
}
d_input.free();
float4 *d_output_data = d_output.data();
pixels.resize(width * height);
for (int y = 0; y < height; y++) {
for (int x = 0; x < width; x++) {
pixels[y * width + x].x = d_output_data[y * width + x].x;
pixels[y * width + x].y = d_output_data[y * width + x].y;
pixels[y * width + x].z = d_output_data[y * width + x].z;
}
}
d_output.free();
}
/* Light */
NODE_DEFINE(Light)
{
NodeType *type = NodeType::add("light", create);
static NodeEnum type_enum;
type_enum.insert("point", LIGHT_POINT);
type_enum.insert("distant", LIGHT_DISTANT);
type_enum.insert("background", LIGHT_BACKGROUND);
type_enum.insert("area", LIGHT_AREA);
type_enum.insert("spot", LIGHT_SPOT);
SOCKET_ENUM(type, "Type", type_enum, LIGHT_POINT);
SOCKET_COLOR(strength, "Strength", make_float3(1.0f, 1.0f, 1.0f));
SOCKET_POINT(co, "Co", make_float3(0.0f, 0.0f, 0.0f));
SOCKET_VECTOR(dir, "Dir", make_float3(0.0f, 0.0f, 0.0f));
SOCKET_FLOAT(size, "Size", 0.0f);
SOCKET_FLOAT(angle, "Angle", 0.0f);
SOCKET_VECTOR(axisu, "Axis U", make_float3(0.0f, 0.0f, 0.0f));
SOCKET_FLOAT(sizeu, "Size U", 1.0f);
SOCKET_VECTOR(axisv, "Axis V", make_float3(0.0f, 0.0f, 0.0f));
SOCKET_FLOAT(sizev, "Size V", 1.0f);
SOCKET_BOOLEAN(round, "Round", false);
SOCKET_INT(map_resolution, "Map Resolution", 0);
SOCKET_FLOAT(spot_angle, "Spot Angle", M_PI_4_F);
SOCKET_FLOAT(spot_smooth, "Spot Smooth", 0.0f);
SOCKET_TRANSFORM(tfm, "Transform", transform_identity());
SOCKET_BOOLEAN(cast_shadow, "Cast Shadow", true);
SOCKET_BOOLEAN(use_mis, "Use Mis", false);
SOCKET_BOOLEAN(use_diffuse, "Use Diffuse", true);
SOCKET_BOOLEAN(use_glossy, "Use Glossy", true);
SOCKET_BOOLEAN(use_transmission, "Use Transmission", true);
SOCKET_BOOLEAN(use_scatter, "Use Scatter", true);
SOCKET_INT(samples, "Samples", 1);
SOCKET_INT(max_bounces, "Max Bounces", 1024);
SOCKET_UINT(random_id, "Random ID", 0);
SOCKET_BOOLEAN(is_portal, "Is Portal", false);
SOCKET_BOOLEAN(is_enabled, "Is Enabled", true);
SOCKET_NODE(shader, "Shader", &Shader::node_type);
return type;
}
Light::Light() : Node(node_type)
{
}
void Light::tag_update(Scene *scene)
{
scene->light_manager->need_update = true;
}
bool Light::has_contribution(Scene *scene)
{
if (strength == make_float3(0.0f, 0.0f, 0.0f)) {
return false;
}
if (is_portal) {
return false;
}
if (type == LIGHT_BACKGROUND) {
return true;
}
return (shader) ? shader->has_surface_emission : scene->default_light->has_surface_emission;
}
/* Light Manager */
LightManager::LightManager()
{
need_update = true;
need_update_background = true;
use_light_visibility = false;
last_background_enabled = false;
last_background_resolution = 0;
}
LightManager::~LightManager()
{
foreach (IESSlot *slot, ies_slots) {
delete slot;
}
}
bool LightManager::has_background_light(Scene *scene)
{
foreach (Light *light, scene->lights) {
if (light->type == LIGHT_BACKGROUND && light->is_enabled) {
return true;
}
}
return false;
}
void LightManager::test_enabled_lights(Scene *scene)
{
/* Make all lights enabled by default, and perform some preliminary checks
* needed for finer-tuning of settings (for example, check whether we've
* got portals or not).
*/
bool has_portal = false, has_background = false;
foreach (Light *light, scene->lights) {
light->is_enabled = light->has_contribution(scene);
has_portal |= light->is_portal;
has_background |= light->type == LIGHT_BACKGROUND;
}
bool background_enabled = false;
int background_resolution = 0;
if (has_background) {
/* Ignore background light if:
* - If unsupported on a device
* - If we don't need it (no HDRs etc.)
*/
Shader *shader = scene->background->get_shader(scene);
const bool disable_mis = !(has_portal || shader->has_surface_spatial_varying);
VLOG_IF(1, disable_mis) << "Background MIS has been disabled.\n";
foreach (Light *light, scene->lights) {
if (light->type == LIGHT_BACKGROUND) {
light->is_enabled = !disable_mis;
background_enabled = !disable_mis;
background_resolution = light->map_resolution;
}
}
}
if (last_background_enabled != background_enabled ||
last_background_resolution != background_resolution) {
last_background_enabled = background_enabled;
last_background_resolution = background_resolution;
need_update_background = true;
}
}
bool LightManager::object_usable_as_light(Object *object)
{
Geometry *geom = object->geometry;
if (geom->type != Geometry::MESH && geom->type != Geometry::VOLUME) {
return false;
}
/* Skip objects with NaNs */
if (!object->bounds.valid()) {
return false;
}
/* Skip if we are not visible for BSDFs. */
if (!(object->visibility & (PATH_RAY_DIFFUSE | PATH_RAY_GLOSSY | PATH_RAY_TRANSMIT))) {
return false;
}
/* Skip if we have no emission shaders. */
/* TODO(sergey): Ideally we want to avoid such duplicated loop, since it'll
* iterate all geometry shaders twice (when counting and when calculating
* triangle area.
*/
foreach (const Shader *shader, geom->used_shaders) {
if (shader->use_mis && shader->has_surface_emission) {
return true;
}
}
return false;
}
void LightManager::device_update_distribution(Device *,
DeviceScene *dscene,
Scene *scene,
Progress &progress)
{
progress.set_status("Updating Lights", "Computing distribution");
/* count */
size_t num_lights = 0;
size_t num_portals = 0;
size_t num_background_lights = 0;
size_t num_triangles = 0;
bool background_mis = false;
foreach (Light *light, scene->lights) {
if (light->is_enabled) {
num_lights++;
}
if (light->is_portal) {
num_portals++;
}
}
foreach (Object *object, scene->objects) {
if (progress.get_cancel())
return;
if (!object_usable_as_light(object)) {
continue;
}
/* Count triangles. */
Mesh *mesh = static_cast<Mesh *>(object->geometry);
size_t mesh_num_triangles = mesh->num_triangles();
for (size_t i = 0; i < mesh_num_triangles; i++) {
int shader_index = mesh->shader[i];
Shader *shader = (shader_index < mesh->used_shaders.size()) ?
mesh->used_shaders[shader_index] :
scene->default_surface;
if (shader->use_mis && shader->has_surface_emission) {
num_triangles++;
}
}
}
size_t num_distribution = num_triangles + num_lights;
VLOG(1) << "Total " << num_distribution << " of light distribution primitives.";
/* emission area */
KernelLightDistribution *distribution = dscene->light_distribution.alloc(num_distribution + 1);
float totarea = 0.0f;
/* triangles */
size_t offset = 0;
int j = 0;
foreach (Object *object, scene->objects) {
if (progress.get_cancel())
return;
if (!object_usable_as_light(object)) {
j++;
continue;
}
/* Sum area. */
Mesh *mesh = static_cast<Mesh *>(object->geometry);
bool transform_applied = mesh->transform_applied;
Transform tfm = object->tfm;
int object_id = j;
int shader_flag = 0;
if (!(object->visibility & PATH_RAY_DIFFUSE)) {
shader_flag |= SHADER_EXCLUDE_DIFFUSE;
use_light_visibility = true;
}
if (!(object->visibility & PATH_RAY_GLOSSY)) {
shader_flag |= SHADER_EXCLUDE_GLOSSY;
use_light_visibility = true;
}
if (!(object->visibility & PATH_RAY_TRANSMIT)) {
shader_flag |= SHADER_EXCLUDE_TRANSMIT;
use_light_visibility = true;
}
if (!(object->visibility & PATH_RAY_VOLUME_SCATTER)) {
shader_flag |= SHADER_EXCLUDE_SCATTER;
use_light_visibility = true;
}
size_t mesh_num_triangles = mesh->num_triangles();
for (size_t i = 0; i < mesh_num_triangles; i++) {
int shader_index = mesh->shader[i];
Shader *shader = (shader_index < mesh->used_shaders.size()) ?
mesh->used_shaders[shader_index] :
scene->default_surface;
if (shader->use_mis && shader->has_surface_emission) {
distribution[offset].totarea = totarea;
distribution[offset].prim = i + mesh->prim_offset;
distribution[offset].mesh_light.shader_flag = shader_flag;
distribution[offset].mesh_light.object_id = object_id;
offset++;
Mesh::Triangle t = mesh->get_triangle(i);
if (!t.valid(&mesh->verts[0])) {
continue;
}
float3 p1 = mesh->verts[t.v[0]];
float3 p2 = mesh->verts[t.v[1]];
float3 p3 = mesh->verts[t.v[2]];
if (!transform_applied) {
p1 = transform_point(&tfm, p1);
p2 = transform_point(&tfm, p2);
p3 = transform_point(&tfm, p3);
}
totarea += triangle_area(p1, p2, p3);
}
}
j++;
}
float trianglearea = totarea;
/* point lights */
float lightarea = (totarea > 0.0f) ? totarea / num_lights : 1.0f;
bool use_lamp_mis = false;
int light_index = 0;
foreach (Light *light, scene->lights) {
if (!light->is_enabled)
continue;
distribution[offset].totarea = totarea;
distribution[offset].prim = ~light_index;
distribution[offset].lamp.pad = 1.0f;
distribution[offset].lamp.size = light->size;
totarea += lightarea;
if (light->type == LIGHT_DISTANT) {
use_lamp_mis |= (light->angle > 0.0f && light->use_mis);
}
else if (light->type == LIGHT_POINT || light->type == LIGHT_SPOT) {
use_lamp_mis |= (light->size > 0.0f && light->use_mis);
}
else if (light->type == LIGHT_AREA) {
use_lamp_mis |= light->use_mis;
}
else if (light->type == LIGHT_BACKGROUND) {
num_background_lights++;
background_mis |= light->use_mis;
}
light_index++;
offset++;
}
/* normalize cumulative distribution functions */
distribution[num_distribution].totarea = totarea;
distribution[num_distribution].prim = 0.0f;
distribution[num_distribution].lamp.pad = 0.0f;
distribution[num_distribution].lamp.size = 0.0f;
if (totarea > 0.0f) {
for (size_t i = 0; i < num_distribution; i++)
distribution[i].totarea /= totarea;
distribution[num_distribution].totarea = 1.0f;
}
if (progress.get_cancel())
return;
/* update device */
KernelIntegrator *kintegrator = &dscene->data.integrator;
KernelBackground *kbackground = &dscene->data.background;
KernelFilm *kfilm = &dscene->data.film;
kintegrator->use_direct_light = (totarea > 0.0f);
if (kintegrator->use_direct_light) {
/* number of emissives */
kintegrator->num_distribution = num_distribution;
/* precompute pdfs */
kintegrator->pdf_triangles = 0.0f;
kintegrator->pdf_lights = 0.0f;
/* sample one, with 0.5 probability of light or triangle */
kintegrator->num_all_lights = num_lights;
if (trianglearea > 0.0f) {
kintegrator->pdf_triangles = 1.0f / trianglearea;
if (num_lights)
kintegrator->pdf_triangles *= 0.5f;
}
if (num_lights) {
kintegrator->pdf_lights = 1.0f / num_lights;
if (trianglearea > 0.0f)
kintegrator->pdf_lights *= 0.5f;
}
kintegrator->use_lamp_mis = use_lamp_mis;
/* bit of an ugly hack to compensate for emitting triangles influencing
* amount of samples we get for this pass */
kfilm->pass_shadow_scale = 1.0f;
if (kintegrator->pdf_triangles != 0.0f)
kfilm->pass_shadow_scale *= 0.5f;
if (num_background_lights < num_lights)
kfilm->pass_shadow_scale *= (float)(num_lights - num_background_lights) / (float)num_lights;
/* CDF */
dscene->light_distribution.copy_to_device();
/* Portals */
if (num_portals > 0) {
kbackground->portal_offset = light_index;
kbackground->num_portals = num_portals;
kbackground->portal_weight = 1.0f;
}
else {
kbackground->num_portals = 0;
kbackground->portal_offset = 0;
kbackground->portal_weight = 0.0f;
}
/* Map */
kbackground->map_weight = background_mis ? 1.0f : 0.0f;
}
else {
dscene->light_distribution.free();
kintegrator->num_distribution = 0;
kintegrator->num_all_lights = 0;
kintegrator->pdf_triangles = 0.0f;
kintegrator->pdf_lights = 0.0f;
kintegrator->use_lamp_mis = false;
kbackground->num_portals = 0;
kbackground->portal_offset = 0;
kbackground->portal_weight = 0.0f;
kbackground->sun_weight = 0.0f;
kbackground->map_weight = 0.0f;
kfilm->pass_shadow_scale = 1.0f;
}
}
static void background_cdf(
int start, int end, int res_x, int res_y, const vector<float3> *pixels, float2 *cond_cdf)
{
int cdf_width = res_x + 1;
/* Conditional CDFs (rows, U direction). */
for (int i = start; i < end; i++) {
float sin_theta = sinf(M_PI_F * (i + 0.5f) / res_y);
float3 env_color = (*pixels)[i * res_x];
float ave_luminance = average(env_color);
cond_cdf[i * cdf_width].x = ave_luminance * sin_theta;
cond_cdf[i * cdf_width].y = 0.0f;
for (int j = 1; j < res_x; j++) {
env_color = (*pixels)[i * res_x + j];
ave_luminance = average(env_color);
cond_cdf[i * cdf_width + j].x = ave_luminance * sin_theta;
cond_cdf[i * cdf_width + j].y = cond_cdf[i * cdf_width + j - 1].y +
cond_cdf[i * cdf_width + j - 1].x / res_x;
}
float cdf_total = cond_cdf[i * cdf_width + res_x - 1].y +
cond_cdf[i * cdf_width + res_x - 1].x / res_x;
float cdf_total_inv = 1.0f / cdf_total;
/* stuff the total into the brightness value for the last entry, because
* we are going to normalize the CDFs to 0.0 to 1.0 afterwards */
cond_cdf[i * cdf_width + res_x].x = cdf_total;
if (cdf_total > 0.0f)
for (int j = 1; j < res_x; j++)
cond_cdf[i * cdf_width + j].y *= cdf_total_inv;
cond_cdf[i * cdf_width + res_x].y = 1.0f;
}
}
void LightManager::device_update_background(Device *device,
DeviceScene *dscene,
Scene *scene,
Progress &progress)
{
KernelBackground *kbackground = &dscene->data.background;
Light *background_light = NULL;
/* find background light */
foreach (Light *light, scene->lights) {
if (light->type == LIGHT_BACKGROUND) {
background_light = light;
break;
}
}
/* no background light found, signal renderer to skip sampling */
if (!background_light || !background_light->is_enabled) {
kbackground->map_res_x = 0;
kbackground->map_res_y = 0;
kbackground->map_weight = 0.0f;
kbackground->sun_weight = 0.0f;
kbackground->use_mis = (kbackground->portal_weight > 0.0f);
return;
}
progress.set_status("Updating Lights", "Importance map");
assert(dscene->data.integrator.use_direct_light);
int2 environment_res = make_int2(0, 0);
Shader *shader = scene->background->get_shader(scene);
int num_suns = 0;
foreach (ShaderNode *node, shader->graph->nodes) {
if (node->type == EnvironmentTextureNode::node_type) {
EnvironmentTextureNode *env = (EnvironmentTextureNode *)node;
ImageMetaData metadata;
if (!env->handle.empty()) {
ImageMetaData metadata = env->handle.metadata();
environment_res.x = max(environment_res.x, metadata.width);
environment_res.y = max(environment_res.y, metadata.height);
}
}
if (node->type == SkyTextureNode::node_type) {
SkyTextureNode *sky = (SkyTextureNode *)node;
if (sky->type == NODE_SKY_NISHITA && sky->sun_disc) {
/* Ensure that the input coordinates aren't transformed before they reach the node.
* If that is the case, the logic used for sampling the sun's location does not work
* and we have to fall back to map-based sampling. */
const ShaderInput *vec_in = sky->input("Vector");
if (vec_in && vec_in->link && vec_in->link->parent) {
ShaderNode *vec_src = vec_in->link->parent;
if ((vec_src->type != TextureCoordinateNode::node_type) ||
(vec_in->link != vec_src->output("Generated"))) {
environment_res.x = max(environment_res.x, 4096);
environment_res.y = max(environment_res.y, 2048);
continue;
}
}
/* Determine sun direction from lat/long and texture mapping. */
float latitude = sky->sun_elevation;
float longitude = M_2PI_F - sky->sun_rotation + M_PI_2_F;
float3 sun_direction = make_float3(
cosf(latitude) * cosf(longitude), cosf(latitude) * sinf(longitude), sinf(latitude));
Transform sky_transform = transform_inverse(sky->tex_mapping.compute_transform());
sun_direction = transform_direction(&sky_transform, sun_direction);
/* Pack sun direction and size. */
float half_angle = sky->get_sun_size() * 0.5f;
kbackground->sun = make_float4(
sun_direction.x, sun_direction.y, sun_direction.z, half_angle);
kbackground->sun_weight = 4.0f;
environment_res.x = max(environment_res.x, 512);
environment_res.y = max(environment_res.y, 256);
num_suns++;
}
}
}
/* If there's more than one sun, fall back to map sampling instead. */
if (num_suns != 1) {
kbackground->sun_weight = 0.0f;
environment_res.x = max(environment_res.x, 4096);
environment_res.y = max(environment_res.y, 2048);
}
/* Enable MIS for background sampling if any strategy is active. */
kbackground->use_mis = (kbackground->portal_weight + kbackground->map_weight +
kbackground->sun_weight) > 0.0f;
/* get the resolution from the light's size (we stuff it in there) */
int2 res = make_int2(background_light->map_resolution, background_light->map_resolution / 2);
/* If the resolution isn't set manually, try to find an environment texture. */
if (res.x == 0) {
res = environment_res;
if (res.x > 0 && res.y > 0) {
VLOG(2) << "Automatically set World MIS resolution to " << res.x << " by " << res.y << "\n";
}
}
/* If it's still unknown, just use the default. */
if (res.x == 0 || res.y == 0) {
res = make_int2(1024, 512);
VLOG(2) << "Setting World MIS resolution to default\n";
}
kbackground->map_res_x = res.x;
kbackground->map_res_y = res.y;
vector<float3> pixels;
shade_background_pixels(device, dscene, res.x, res.y, pixels, progress);
if (progress.get_cancel())
return;
/* build row distributions and column distribution for the infinite area environment light */
int cdf_width = res.x + 1;
float2 *marg_cdf = dscene->light_background_marginal_cdf.alloc(res.y + 1);
float2 *cond_cdf = dscene->light_background_conditional_cdf.alloc(cdf_width * res.y);
double time_start = time_dt();
/* Create CDF in parallel. */
const int rows_per_task = divide_up(10240, res.x);
parallel_for(blocked_range<size_t>(0, res.y, rows_per_task),
[&](const blocked_range<size_t> &r) {
background_cdf(r.begin(), r.end(), res.x, res.y, &pixels, cond_cdf);
});
/* marginal CDFs (column, V direction, sum of rows) */
marg_cdf[0].x = cond_cdf[res.x].x;
marg_cdf[0].y = 0.0f;
for (int i = 1; i < res.y; i++) {
marg_cdf[i].x = cond_cdf[i * cdf_width + res.x].x;
marg_cdf[i].y = marg_cdf[i - 1].y + marg_cdf[i - 1].x / res.y;
}
float cdf_total = marg_cdf[res.y - 1].y + marg_cdf[res.y - 1].x / res.y;
marg_cdf[res.y].x = cdf_total;
if (cdf_total > 0.0f)
for (int i = 1; i < res.y; i++)
marg_cdf[i].y /= cdf_total;
marg_cdf[res.y].y = 1.0f;
VLOG(2) << "Background MIS build time " << time_dt() - time_start << "\n";
/* update device */
dscene->light_background_marginal_cdf.copy_to_device();
dscene->light_background_conditional_cdf.copy_to_device();
}
void LightManager::device_update_points(Device *, DeviceScene *dscene, Scene *scene)
{
int num_scene_lights = scene->lights.size();
int num_lights = 0;
foreach (Light *light, scene->lights) {
if (light->is_enabled || light->is_portal) {
num_lights++;
}
}
KernelLight *klights = dscene->lights.alloc(num_lights);
if (num_lights == 0) {
VLOG(1) << "No effective light, ignoring points update.";
return;
}
int light_index = 0;
foreach (Light *light, scene->lights) {
if (!light->is_enabled) {
continue;
}
float3 co = light->co;
Shader *shader = (light->shader) ? light->shader : scene->default_light;
int shader_id = scene->shader_manager->get_shader_id(shader);
int max_bounces = light->max_bounces;
float random = (float)light->random_id * (1.0f / (float)0xFFFFFFFF);
if (!light->cast_shadow)
shader_id &= ~SHADER_CAST_SHADOW;
if (!light->use_diffuse) {
shader_id |= SHADER_EXCLUDE_DIFFUSE;
use_light_visibility = true;
}
if (!light->use_glossy) {
shader_id |= SHADER_EXCLUDE_GLOSSY;
use_light_visibility = true;
}
if (!light->use_transmission) {
shader_id |= SHADER_EXCLUDE_TRANSMIT;
use_light_visibility = true;
}
if (!light->use_scatter) {
shader_id |= SHADER_EXCLUDE_SCATTER;
use_light_visibility = true;
}
klights[light_index].type = light->type;
klights[light_index].samples = light->samples;
klights[light_index].strength[0] = light->strength.x;
klights[light_index].strength[1] = light->strength.y;
klights[light_index].strength[2] = light->strength.z;
if (light->type == LIGHT_POINT) {
shader_id &= ~SHADER_AREA_LIGHT;
float radius = light->size;
float invarea = (radius > 0.0f) ? 1.0f / (M_PI_F * radius * radius) : 1.0f;
if (light->use_mis && radius > 0.0f)
shader_id |= SHADER_USE_MIS;
klights[light_index].co[0] = co.x;
klights[light_index].co[1] = co.y;
klights[light_index].co[2] = co.z;
klights[light_index].spot.radius = radius;
klights[light_index].spot.invarea = invarea;
}
else if (light->type == LIGHT_DISTANT) {
shader_id &= ~SHADER_AREA_LIGHT;
float angle = light->angle / 2.0f;
float radius = tanf(angle);
float cosangle = cosf(angle);
float area = M_PI_F * radius * radius;
float invarea = (area > 0.0f) ? 1.0f / area : 1.0f;
float3 dir = light->dir;
dir = safe_normalize(dir);
if (light->use_mis && area > 0.0f)
shader_id |= SHADER_USE_MIS;
klights[light_index].co[0] = dir.x;
klights[light_index].co[1] = dir.y;
klights[light_index].co[2] = dir.z;
klights[light_index].distant.invarea = invarea;
klights[light_index].distant.radius = radius;
klights[light_index].distant.cosangle = cosangle;
}
else if (light->type == LIGHT_BACKGROUND) {
uint visibility = scene->background->visibility;
shader_id &= ~SHADER_AREA_LIGHT;
shader_id |= SHADER_USE_MIS;
if (!(visibility & PATH_RAY_DIFFUSE)) {
shader_id |= SHADER_EXCLUDE_DIFFUSE;
use_light_visibility = true;
}
if (!(visibility & PATH_RAY_GLOSSY)) {
shader_id |= SHADER_EXCLUDE_GLOSSY;
use_light_visibility = true;
}
if (!(visibility & PATH_RAY_TRANSMIT)) {
shader_id |= SHADER_EXCLUDE_TRANSMIT;
use_light_visibility = true;
}
if (!(visibility & PATH_RAY_VOLUME_SCATTER)) {
shader_id |= SHADER_EXCLUDE_SCATTER;
use_light_visibility = true;
}
}
else if (light->type == LIGHT_AREA) {
float3 axisu = light->axisu * (light->sizeu * light->size);
float3 axisv = light->axisv * (light->sizev * light->size);
float area = len(axisu) * len(axisv);
if (light->round) {
area *= -M_PI_4_F;
}
float invarea = (area != 0.0f) ? 1.0f / area : 1.0f;
float3 dir = light->dir;
dir = safe_normalize(dir);
if (light->use_mis && area != 0.0f)
shader_id |= SHADER_USE_MIS;
klights[light_index].co[0] = co.x;
klights[light_index].co[1] = co.y;
klights[light_index].co[2] = co.z;
klights[light_index].area.axisu[0] = axisu.x;
klights[light_index].area.axisu[1] = axisu.y;
klights[light_index].area.axisu[2] = axisu.z;
klights[light_index].area.axisv[0] = axisv.x;
klights[light_index].area.axisv[1] = axisv.y;
klights[light_index].area.axisv[2] = axisv.z;
klights[light_index].area.invarea = invarea;
klights[light_index].area.dir[0] = dir.x;
klights[light_index].area.dir[1] = dir.y;
klights[light_index].area.dir[2] = dir.z;
}
else if (light->type == LIGHT_SPOT) {
shader_id &= ~SHADER_AREA_LIGHT;
float radius = light->size;
float invarea = (radius > 0.0f) ? 1.0f / (M_PI_F * radius * radius) : 1.0f;
float spot_angle = cosf(light->spot_angle * 0.5f);
float spot_smooth = (1.0f - spot_angle) * light->spot_smooth;
float3 dir = light->dir;
dir = safe_normalize(dir);
if (light->use_mis && radius > 0.0f)
shader_id |= SHADER_USE_MIS;
klights[light_index].co[0] = co.x;
klights[light_index].co[1] = co.y;
klights[light_index].co[2] = co.z;
klights[light_index].spot.radius = radius;
klights[light_index].spot.invarea = invarea;
klights[light_index].spot.spot_angle = spot_angle;
klights[light_index].spot.spot_smooth = spot_smooth;
klights[light_index].spot.dir[0] = dir.x;
klights[light_index].spot.dir[1] = dir.y;
klights[light_index].spot.dir[2] = dir.z;
}
klights[light_index].shader_id = shader_id;
klights[light_index].max_bounces = max_bounces;
klights[light_index].random = random;
klights[light_index].tfm = light->tfm;
klights[light_index].itfm = transform_inverse(light->tfm);
light_index++;
}
/* TODO(sergey): Consider moving portals update to their own function
* keeping this one more manageable.
*/
foreach (Light *light, scene->lights) {
if (!light->is_portal)
continue;
assert(light->type == LIGHT_AREA);
float3 co = light->co;
float3 axisu = light->axisu * (light->sizeu * light->size);
float3 axisv = light->axisv * (light->sizev * light->size);
float area = len(axisu) * len(axisv);
if (light->round) {
area *= -M_PI_4_F;
}
float invarea = (area != 0.0f) ? 1.0f / area : 1.0f;
float3 dir = light->dir;
dir = safe_normalize(dir);
klights[light_index].co[0] = co.x;
klights[light_index].co[1] = co.y;
klights[light_index].co[2] = co.z;
klights[light_index].area.axisu[0] = axisu.x;
klights[light_index].area.axisu[1] = axisu.y;
klights[light_index].area.axisu[2] = axisu.z;
klights[light_index].area.axisv[0] = axisv.x;
klights[light_index].area.axisv[1] = axisv.y;
klights[light_index].area.axisv[2] = axisv.z;
klights[light_index].area.invarea = invarea;
klights[light_index].area.dir[0] = dir.x;
klights[light_index].area.dir[1] = dir.y;
klights[light_index].area.dir[2] = dir.z;
klights[light_index].tfm = light->tfm;
klights[light_index].itfm = transform_inverse(light->tfm);
light_index++;
}
VLOG(1) << "Number of lights sent to the device: " << light_index;
VLOG(1) << "Number of lights without contribution: " << num_scene_lights - light_index;
dscene->lights.copy_to_device();
}
void LightManager::device_update(Device *device,
DeviceScene *dscene,
Scene *scene,
Progress &progress)
{
if (!need_update)
return;
VLOG(1) << "Total " << scene->lights.size() << " lights.";
/* Detect which lights are enabled, also determins if we need to update the background. */
test_enabled_lights(scene);
device_free(device, dscene, need_update_background);
use_light_visibility = false;
device_update_points(device, dscene, scene);
if (progress.get_cancel())
return;
device_update_distribution(device, dscene, scene, progress);
if (progress.get_cancel())
return;
if (need_update_background) {
device_update_background(device, dscene, scene, progress);
if (progress.get_cancel())
return;
}
device_update_ies(dscene);
if (progress.get_cancel())
return;
if (use_light_visibility != scene->film->use_light_visibility) {
scene->film->use_light_visibility = use_light_visibility;
scene->film->tag_update(scene);
}
need_update = false;
need_update_background = false;
}
void LightManager::device_free(Device *, DeviceScene *dscene, const bool free_background)
{
dscene->light_distribution.free();
dscene->lights.free();
if (free_background) {
dscene->light_background_marginal_cdf.free();
dscene->light_background_conditional_cdf.free();
}
dscene->ies_lights.free();
}
void LightManager::tag_update(Scene * /*scene*/)
{
need_update = true;
}
int LightManager::add_ies_from_file(const string &filename)
{
string content;
/* If the file can't be opened, call with an empty line */
if (filename.empty() || !path_read_text(filename.c_str(), content)) {
content = "\n";
}
return add_ies(content);
}
int LightManager::add_ies(const string &content)
{
uint hash = hash_string(content.c_str());
thread_scoped_lock ies_lock(ies_mutex);
/* Check whether this IES already has a slot. */
size_t slot;
for (slot = 0; slot < ies_slots.size(); slot++) {
if (ies_slots[slot]->hash == hash) {
ies_slots[slot]->users++;
return slot;
}
}
/* Try to find an empty slot for the new IES. */
for (slot = 0; slot < ies_slots.size(); slot++) {
if (ies_slots[slot]->users == 0 && ies_slots[slot]->hash == 0) {
break;
}
}
/* If there's no free slot, add one. */
if (slot == ies_slots.size()) {
ies_slots.push_back(new IESSlot());
}
ies_slots[slot]->ies.load(content);
ies_slots[slot]->users = 1;
ies_slots[slot]->hash = hash;
need_update = true;
need_update_background = true;
return slot;
}
void LightManager::remove_ies(int slot)
{
thread_scoped_lock ies_lock(ies_mutex);
if (slot < 0 || slot >= ies_slots.size()) {
assert(false);
return;
}
assert(ies_slots[slot]->users > 0);
ies_slots[slot]->users--;
/* If the slot has no more users, update the device to remove it. */
need_update |= (ies_slots[slot]->users == 0);
need_update_background |= need_update;
}
void LightManager::device_update_ies(DeviceScene *dscene)
{
/* Clear empty slots. */
foreach (IESSlot *slot, ies_slots) {
if (slot->users == 0) {
slot->hash = 0;
slot->ies.clear();
}
}
/* Shrink the slot table by removing empty slots at the end. */
int slot_end;
for (slot_end = ies_slots.size(); slot_end; slot_end--) {
if (ies_slots[slot_end - 1]->users > 0) {
/* If the preceding slot has users, we found the new end of the table. */
break;
}
else {
/* The slot will be past the new end of the table, so free it. */
delete ies_slots[slot_end - 1];
}
}
ies_slots.resize(slot_end);
if (ies_slots.size() > 0) {
int packed_size = 0;
foreach (IESSlot *slot, ies_slots) {
packed_size += slot->ies.packed_size();
}
/* ies_lights starts with an offset table that contains the offset of every slot,
* or -1 if the slot is invalid.
* Following that table, the packed valid IES lights are stored. */
float *data = dscene->ies_lights.alloc(ies_slots.size() + packed_size);
int offset = ies_slots.size();
for (int i = 0; i < ies_slots.size(); i++) {
int size = ies_slots[i]->ies.packed_size();
if (size > 0) {
data[i] = __int_as_float(offset);
ies_slots[i]->ies.pack(data + offset);
offset += size;
}
else {
data[i] = __int_as_float(-1);
}
}
dscene->ies_lights.copy_to_device();
}
}
CCL_NAMESPACE_END
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