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lightmapper_rd.cpp
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lightmapper_rd.cpp
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/**************************************************************************/
/* lightmapper_rd.cpp */
/**************************************************************************/
/* This file is part of: */
/* GODOT ENGINE */
/* https://godotengine.org */
/**************************************************************************/
/* Copyright (c) 2014-present Godot Engine contributors (see AUTHORS.md). */
/* Copyright (c) 2007-2014 Juan Linietsky, Ariel Manzur. */
/* */
/* Permission is hereby granted, free of charge, to any person obtaining */
/* a copy of this software and associated documentation files (the */
/* "Software"), to deal in the Software without restriction, including */
/* without limitation the rights to use, copy, modify, merge, publish, */
/* distribute, sublicense, and/or sell copies of the Software, and to */
/* permit persons to whom the Software is furnished to do so, subject to */
/* the following conditions: */
/* */
/* The above copyright notice and this permission notice shall be */
/* included in all copies or substantial portions of the Software. */
/* */
/* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, */
/* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF */
/* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. */
/* IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY */
/* CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, */
/* TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE */
/* SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE. */
/**************************************************************************/
#include "lightmapper_rd.h"
#include "core/string/print_string.h"
#include "lm_blendseams.glsl.gen.h"
#include "lm_compute.glsl.gen.h"
#include "lm_raster.glsl.gen.h"
#include "core/config/project_settings.h"
#include "core/io/dir_access.h"
#include "core/math/geometry_2d.h"
#include "editor/editor_paths.h"
#include "editor/editor_settings.h"
#include "servers/rendering/rendering_device_binds.h"
#include "servers/rendering/rendering_server_globals.h"
#if defined(VULKAN_ENABLED)
#include "drivers/vulkan/rendering_context_driver_vulkan.h"
#endif
#if defined(METAL_ENABLED)
#include "drivers/metal/rendering_context_driver_metal.h"
#endif
//uncomment this if you want to see textures from all the process saved
//#define DEBUG_TEXTURES
void LightmapperRD::add_mesh(const MeshData &p_mesh) {
ERR_FAIL_COND(p_mesh.albedo_on_uv2.is_null() || p_mesh.albedo_on_uv2->is_empty());
ERR_FAIL_COND(p_mesh.emission_on_uv2.is_null() || p_mesh.emission_on_uv2->is_empty());
ERR_FAIL_COND(p_mesh.albedo_on_uv2->get_width() != p_mesh.emission_on_uv2->get_width());
ERR_FAIL_COND(p_mesh.albedo_on_uv2->get_height() != p_mesh.emission_on_uv2->get_height());
ERR_FAIL_COND(p_mesh.points.is_empty());
MeshInstance mi;
mi.data = p_mesh;
mesh_instances.push_back(mi);
}
void LightmapperRD::add_directional_light(const String &p_name, bool p_static, const Vector3 &p_direction, const Color &p_color, float p_energy, float p_indirect_energy, float p_angular_distance, float p_shadow_blur) {
Light l;
l.type = LIGHT_TYPE_DIRECTIONAL;
l.direction[0] = p_direction.x;
l.direction[1] = p_direction.y;
l.direction[2] = p_direction.z;
l.color[0] = p_color.r;
l.color[1] = p_color.g;
l.color[2] = p_color.b;
l.energy = p_energy;
l.indirect_energy = p_indirect_energy;
l.static_bake = p_static;
l.size = Math::tan(Math::deg_to_rad(p_angular_distance));
l.shadow_blur = p_shadow_blur;
lights.push_back(l);
light_names.push_back(p_name);
}
void LightmapperRD::add_omni_light(const String &p_name, bool p_static, const Vector3 &p_position, const Color &p_color, float p_energy, float p_indirect_energy, float p_range, float p_attenuation, float p_size, float p_shadow_blur) {
Light l;
l.type = LIGHT_TYPE_OMNI;
l.position[0] = p_position.x;
l.position[1] = p_position.y;
l.position[2] = p_position.z;
l.range = p_range;
l.attenuation = p_attenuation;
l.color[0] = p_color.r;
l.color[1] = p_color.g;
l.color[2] = p_color.b;
l.energy = p_energy;
l.indirect_energy = p_indirect_energy;
l.static_bake = p_static;
l.size = p_size;
l.shadow_blur = p_shadow_blur;
lights.push_back(l);
light_names.push_back(p_name);
}
void LightmapperRD::add_spot_light(const String &p_name, bool p_static, const Vector3 &p_position, const Vector3 p_direction, const Color &p_color, float p_energy, float p_indirect_energy, float p_range, float p_attenuation, float p_spot_angle, float p_spot_attenuation, float p_size, float p_shadow_blur) {
Light l;
l.type = LIGHT_TYPE_SPOT;
l.position[0] = p_position.x;
l.position[1] = p_position.y;
l.position[2] = p_position.z;
l.direction[0] = p_direction.x;
l.direction[1] = p_direction.y;
l.direction[2] = p_direction.z;
l.range = p_range;
l.attenuation = p_attenuation;
l.cos_spot_angle = Math::cos(Math::deg_to_rad(p_spot_angle));
l.inv_spot_attenuation = 1.0f / p_spot_attenuation;
l.color[0] = p_color.r;
l.color[1] = p_color.g;
l.color[2] = p_color.b;
l.energy = p_energy;
l.indirect_energy = p_indirect_energy;
l.static_bake = p_static;
l.size = p_size;
l.shadow_blur = p_shadow_blur;
lights.push_back(l);
light_names.push_back(p_name);
}
void LightmapperRD::add_probe(const Vector3 &p_position) {
Probe probe;
probe.position[0] = p_position.x;
probe.position[1] = p_position.y;
probe.position[2] = p_position.z;
probe.position[3] = 0;
probe_positions.push_back(probe);
}
void LightmapperRD::_plot_triangle_into_triangle_index_list(int p_size, const Vector3i &p_ofs, const AABB &p_bounds, const Vector3 p_points[3], uint32_t p_triangle_index, LocalVector<TriangleSort> &p_triangles_sort, uint32_t p_grid_size) {
int half_size = p_size / 2;
for (int i = 0; i < 8; i++) {
AABB aabb = p_bounds;
aabb.size *= 0.5;
Vector3i n = p_ofs;
if (i & 1) {
aabb.position.x += aabb.size.x;
n.x += half_size;
}
if (i & 2) {
aabb.position.y += aabb.size.y;
n.y += half_size;
}
if (i & 4) {
aabb.position.z += aabb.size.z;
n.z += half_size;
}
{
Vector3 qsize = aabb.size * 0.5; //quarter size, for fast aabb test
if (!Geometry3D::triangle_box_overlap(aabb.position + qsize, qsize, p_points)) {
//does not fit in child, go on
continue;
}
}
if (half_size == 1) {
//got to the end
TriangleSort ts;
ts.cell_index = n.x + (n.y * p_grid_size) + (n.z * p_grid_size * p_grid_size);
ts.triangle_index = p_triangle_index;
ts.triangle_aabb.position = p_points[0];
ts.triangle_aabb.size = Vector3();
ts.triangle_aabb.expand_to(p_points[1]);
ts.triangle_aabb.expand_to(p_points[2]);
p_triangles_sort.push_back(ts);
} else {
_plot_triangle_into_triangle_index_list(half_size, n, aabb, p_points, p_triangle_index, p_triangles_sort, p_grid_size);
}
}
}
void LightmapperRD::_sort_triangle_clusters(uint32_t p_cluster_size, uint32_t p_cluster_index, uint32_t p_index_start, uint32_t p_count, LocalVector<TriangleSort> &p_triangle_sort, LocalVector<ClusterAABB> &p_cluster_aabb) {
if (p_count == 0) {
return;
}
// Compute AABB for all triangles in the range.
SortArray<TriangleSort, TriangleSortAxis<0>> triangle_sorter_x;
SortArray<TriangleSort, TriangleSortAxis<1>> triangle_sorter_y;
SortArray<TriangleSort, TriangleSortAxis<2>> triangle_sorter_z;
AABB cluster_aabb = p_triangle_sort[p_index_start].triangle_aabb;
for (uint32_t i = 1; i < p_count; i++) {
cluster_aabb.merge_with(p_triangle_sort[p_index_start + i].triangle_aabb);
}
if (p_count > p_cluster_size) {
int longest_axis_index = cluster_aabb.get_longest_axis_index();
switch (longest_axis_index) {
case 0:
triangle_sorter_x.sort(&p_triangle_sort[p_index_start], p_count);
break;
case 1:
triangle_sorter_y.sort(&p_triangle_sort[p_index_start], p_count);
break;
case 2:
triangle_sorter_z.sort(&p_triangle_sort[p_index_start], p_count);
break;
default:
DEV_ASSERT(false && "Invalid axis returned by AABB.");
break;
}
uint32_t left_cluster_count = next_power_of_2(p_count / 2);
left_cluster_count = MAX(left_cluster_count, p_cluster_size);
left_cluster_count = MIN(left_cluster_count, p_count);
_sort_triangle_clusters(p_cluster_size, p_cluster_index, p_index_start, left_cluster_count, p_triangle_sort, p_cluster_aabb);
if (left_cluster_count < p_count) {
uint32_t cluster_index_right = p_cluster_index + (left_cluster_count / p_cluster_size);
_sort_triangle_clusters(p_cluster_size, cluster_index_right, p_index_start + left_cluster_count, p_count - left_cluster_count, p_triangle_sort, p_cluster_aabb);
}
} else {
ClusterAABB &aabb = p_cluster_aabb[p_cluster_index];
Vector3 aabb_end = cluster_aabb.get_end();
aabb.min_bounds[0] = cluster_aabb.position.x;
aabb.min_bounds[1] = cluster_aabb.position.y;
aabb.min_bounds[2] = cluster_aabb.position.z;
aabb.max_bounds[0] = aabb_end.x;
aabb.max_bounds[1] = aabb_end.y;
aabb.max_bounds[2] = aabb_end.z;
}
}
Lightmapper::BakeError LightmapperRD::_blit_meshes_into_atlas(int p_max_texture_size, int p_denoiser_range, Vector<Ref<Image>> &albedo_images, Vector<Ref<Image>> &emission_images, AABB &bounds, Size2i &atlas_size, int &atlas_slices, float p_supersampling_factor, BakeStepFunc p_step_function, void *p_bake_userdata) {
Vector<Size2i> sizes;
for (int m_i = 0; m_i < mesh_instances.size(); m_i++) {
MeshInstance &mi = mesh_instances.write[m_i];
Size2i s = Size2i(mi.data.albedo_on_uv2->get_width(), mi.data.albedo_on_uv2->get_height());
sizes.push_back(s);
atlas_size = atlas_size.max(s + Size2i(2, 2).maxi(p_denoiser_range) * p_supersampling_factor);
}
int max = nearest_power_of_2_templated(atlas_size.width);
max = MAX(max, nearest_power_of_2_templated(atlas_size.height));
if (max > p_max_texture_size) {
return BAKE_ERROR_TEXTURE_EXCEEDS_MAX_SIZE;
}
if (p_step_function) {
if (p_step_function(0.1, RTR("Determining optimal atlas size"), p_bake_userdata, true)) {
return BAKE_ERROR_USER_ABORTED;
}
}
atlas_size = Size2i(max, max);
Size2i best_atlas_size;
int best_atlas_slices = 0;
int best_atlas_memory = 0x7FFFFFFF;
Vector<Vector3i> best_atlas_offsets;
// Determine best texture array atlas size by bruteforce fitting.
while (atlas_size.x <= p_max_texture_size && atlas_size.y <= p_max_texture_size) {
Vector<Vector2i> source_sizes;
Vector<int> source_indices;
source_sizes.resize(sizes.size());
source_indices.resize(sizes.size());
for (int i = 0; i < source_indices.size(); i++) {
// Add padding between lightmaps.
// Scale the padding if the lightmap will be downsampled at the end of the baking process
// Otherwise the padding would be insufficient.
source_sizes.write[i] = sizes[i] + Vector2i(2, 2).maxi(p_denoiser_range) * p_supersampling_factor;
source_indices.write[i] = i;
}
Vector<Vector3i> atlas_offsets;
atlas_offsets.resize(source_sizes.size());
// Ensure the sizes can all fit into a single atlas layer.
// This should always happen, and this check is only in place to prevent an infinite loop.
for (int i = 0; i < source_sizes.size(); i++) {
if (source_sizes[i] > atlas_size) {
return BAKE_ERROR_ATLAS_TOO_SMALL;
}
}
int slices = 0;
while (source_sizes.size() > 0) {
Vector<Vector3i> offsets = Geometry2D::partial_pack_rects(source_sizes, atlas_size);
Vector<int> new_indices;
Vector<Vector2i> new_sources;
for (int i = 0; i < offsets.size(); i++) {
Vector3i ofs = offsets[i];
int sidx = source_indices[i];
if (ofs.z > 0) {
//valid
ofs.z = slices;
atlas_offsets.write[sidx] = ofs + Vector3i(1, 1, 0); // Center lightmap in the reserved oversized region
} else {
new_indices.push_back(sidx);
new_sources.push_back(source_sizes[i]);
}
}
source_sizes = new_sources;
source_indices = new_indices;
slices++;
}
int mem_used = atlas_size.x * atlas_size.y * slices;
if (mem_used < best_atlas_memory) {
best_atlas_size = atlas_size;
best_atlas_offsets = atlas_offsets;
best_atlas_slices = slices;
best_atlas_memory = mem_used;
}
if (atlas_size.width == atlas_size.height) {
atlas_size.width *= 2;
} else {
atlas_size.height *= 2;
}
}
atlas_size = best_atlas_size;
atlas_slices = best_atlas_slices;
// apply the offsets and slice to all images, and also blit albedo and emission
albedo_images.resize(atlas_slices);
emission_images.resize(atlas_slices);
if (p_step_function) {
if (p_step_function(0.2, RTR("Blitting albedo and emission"), p_bake_userdata, true)) {
return BAKE_ERROR_USER_ABORTED;
}
}
for (int i = 0; i < atlas_slices; i++) {
Ref<Image> albedo = Image::create_empty(atlas_size.width, atlas_size.height, false, Image::FORMAT_RGBA8);
albedo->set_as_black();
albedo_images.write[i] = albedo;
Ref<Image> emission = Image::create_empty(atlas_size.width, atlas_size.height, false, Image::FORMAT_RGBAH);
emission->set_as_black();
emission_images.write[i] = emission;
}
//assign uv positions
for (int m_i = 0; m_i < mesh_instances.size(); m_i++) {
MeshInstance &mi = mesh_instances.write[m_i];
mi.offset.x = best_atlas_offsets[m_i].x;
mi.offset.y = best_atlas_offsets[m_i].y;
mi.slice = best_atlas_offsets[m_i].z;
albedo_images.write[mi.slice]->blit_rect(mi.data.albedo_on_uv2, Rect2i(Vector2i(), mi.data.albedo_on_uv2->get_size()), mi.offset);
emission_images.write[mi.slice]->blit_rect(mi.data.emission_on_uv2, Rect2(Vector2i(), mi.data.emission_on_uv2->get_size()), mi.offset);
}
return BAKE_OK;
}
void LightmapperRD::_create_acceleration_structures(RenderingDevice *rd, Size2i atlas_size, int atlas_slices, AABB &bounds, int grid_size, uint32_t p_cluster_size, Vector<Probe> &p_probe_positions, GenerateProbes p_generate_probes, Vector<int> &slice_triangle_count, Vector<int> &slice_seam_count, RID &vertex_buffer, RID &triangle_buffer, RID &lights_buffer, RID &r_triangle_indices_buffer, RID &r_cluster_indices_buffer, RID &r_cluster_aabbs_buffer, RID &probe_positions_buffer, RID &grid_texture, RID &seams_buffer, BakeStepFunc p_step_function, void *p_bake_userdata) {
HashMap<Vertex, uint32_t, VertexHash> vertex_map;
//fill triangles array and vertex array
LocalVector<Triangle> triangles;
LocalVector<Vertex> vertex_array;
LocalVector<Seam> seams;
slice_triangle_count.resize(atlas_slices);
slice_seam_count.resize(atlas_slices);
for (int i = 0; i < atlas_slices; i++) {
slice_triangle_count.write[i] = 0;
slice_seam_count.write[i] = 0;
}
bounds = AABB();
for (int m_i = 0; m_i < mesh_instances.size(); m_i++) {
if (p_step_function) {
float p = float(m_i + 1) / MAX(1, mesh_instances.size()) * 0.1;
p_step_function(0.3 + p, vformat(RTR("Plotting mesh into acceleration structure %d/%d"), m_i + 1, mesh_instances.size()), p_bake_userdata, false);
}
HashMap<Edge, EdgeUV2, EdgeHash> edges;
MeshInstance &mi = mesh_instances.write[m_i];
Vector2 uv_scale = Vector2(mi.data.albedo_on_uv2->get_width(), mi.data.albedo_on_uv2->get_height()) / Vector2(atlas_size);
Vector2 uv_offset = Vector2(mi.offset) / Vector2(atlas_size);
if (m_i == 0) {
bounds.position = mi.data.points[0];
}
for (int i = 0; i < mi.data.points.size(); i += 3) {
Vector3 vtxs[3] = { mi.data.points[i + 0], mi.data.points[i + 1], mi.data.points[i + 2] };
Vector2 uvs[3] = { mi.data.uv2[i + 0] * uv_scale + uv_offset, mi.data.uv2[i + 1] * uv_scale + uv_offset, mi.data.uv2[i + 2] * uv_scale + uv_offset };
Vector3 normal[3] = { mi.data.normal[i + 0], mi.data.normal[i + 1], mi.data.normal[i + 2] };
AABB taabb;
Triangle t;
t.slice = mi.slice;
for (int k = 0; k < 3; k++) {
bounds.expand_to(vtxs[k]);
Vertex v;
v.position[0] = vtxs[k].x;
v.position[1] = vtxs[k].y;
v.position[2] = vtxs[k].z;
v.uv[0] = uvs[k].x;
v.uv[1] = uvs[k].y;
v.normal_xy[0] = normal[k].x;
v.normal_xy[1] = normal[k].y;
v.normal_z = normal[k].z;
uint32_t *indexptr = vertex_map.getptr(v);
if (indexptr) {
t.indices[k] = *indexptr;
} else {
uint32_t new_index = vertex_map.size();
t.indices[k] = new_index;
vertex_map[v] = new_index;
vertex_array.push_back(v);
}
if (k == 0) {
taabb.position = vtxs[k];
} else {
taabb.expand_to(vtxs[k]);
}
}
//compute seams that will need to be blended later
for (int k = 0; k < 3; k++) {
int n = (k + 1) % 3;
Edge edge(vtxs[k], vtxs[n], normal[k], normal[n]);
Vector2i edge_indices(t.indices[k], t.indices[n]);
EdgeUV2 uv2(uvs[k], uvs[n], edge_indices);
if (edge.b == edge.a) {
continue; //degenerate, somehow
}
if (edge.b < edge.a) {
SWAP(edge.a, edge.b);
SWAP(edge.na, edge.nb);
SWAP(uv2.a, uv2.b);
SWAP(uv2.indices.x, uv2.indices.y);
SWAP(edge_indices.x, edge_indices.y);
}
EdgeUV2 *euv2 = edges.getptr(edge);
if (!euv2) {
edges[edge] = uv2;
} else {
if (*euv2 == uv2) {
continue; // seam shared UV space, no need to blend
}
if (euv2->seam_found) {
continue; //bad geometry
}
Seam seam;
seam.a = edge_indices;
seam.b = euv2->indices;
seam.slice = mi.slice;
seams.push_back(seam);
slice_seam_count.write[mi.slice]++;
euv2->seam_found = true;
}
}
t.min_bounds[0] = taabb.position.x;
t.min_bounds[1] = taabb.position.y;
t.min_bounds[2] = taabb.position.z;
t.max_bounds[0] = taabb.position.x + MAX(taabb.size.x, 0.0001);
t.max_bounds[1] = taabb.position.y + MAX(taabb.size.y, 0.0001);
t.max_bounds[2] = taabb.position.z + MAX(taabb.size.z, 0.0001);
t.cull_mode = RS::CULL_MODE_BACK;
RID material = mi.data.material[i];
if (material.is_valid()) {
t.cull_mode = RSG::material_storage->material_get_cull_mode(material);
}
t.pad1 = 0; //make valgrind not complain
triangles.push_back(t);
slice_triangle_count.write[t.slice]++;
}
}
//also consider probe positions for bounds
for (int i = 0; i < p_probe_positions.size(); i++) {
Vector3 pp(p_probe_positions[i].position[0], p_probe_positions[i].position[1], p_probe_positions[i].position[2]);
bounds.expand_to(pp);
}
bounds.grow_by(0.1); //grow a bit to avoid numerical error
triangles.sort(); //sort by slice
seams.sort();
if (p_step_function) {
p_step_function(0.4, RTR("Optimizing acceleration structure"), p_bake_userdata, true);
}
//fill list of triangles in grid
LocalVector<TriangleSort> triangle_sort;
for (uint32_t i = 0; i < triangles.size(); i++) {
const Triangle &t = triangles[i];
Vector3 face[3] = {
Vector3(vertex_array[t.indices[0]].position[0], vertex_array[t.indices[0]].position[1], vertex_array[t.indices[0]].position[2]),
Vector3(vertex_array[t.indices[1]].position[0], vertex_array[t.indices[1]].position[1], vertex_array[t.indices[1]].position[2]),
Vector3(vertex_array[t.indices[2]].position[0], vertex_array[t.indices[2]].position[1], vertex_array[t.indices[2]].position[2])
};
_plot_triangle_into_triangle_index_list(grid_size, Vector3i(), bounds, face, i, triangle_sort, grid_size);
}
//sort it
triangle_sort.sort();
LocalVector<uint32_t> cluster_indices;
LocalVector<ClusterAABB> cluster_aabbs;
Vector<uint32_t> triangle_indices;
triangle_indices.resize(triangle_sort.size());
Vector<uint32_t> grid_indices;
grid_indices.resize(grid_size * grid_size * grid_size * 2);
memset(grid_indices.ptrw(), 0, grid_indices.size() * sizeof(uint32_t));
{
// Fill grid with cell indices.
uint32_t last_cell = 0xFFFFFFFF;
uint32_t *giw = grid_indices.ptrw();
uint32_t cluster_count = 0;
uint32_t solid_cell_count = 0;
for (uint32_t i = 0; i < triangle_sort.size(); i++) {
uint32_t cell = triangle_sort[i].cell_index;
if (cell != last_cell) {
giw[cell * 2 + 1] = solid_cell_count;
solid_cell_count++;
}
if ((giw[cell * 2] % p_cluster_size) == 0) {
// Add an extra cluster every time the triangle counter reaches a multiple of the cluster size.
cluster_count++;
}
giw[cell * 2]++;
last_cell = cell;
}
// Build fixed-size triangle clusters for all the cells to speed up the traversal. A cell can hold multiple clusters that each contain a fixed
// amount of triangles and an AABB. The tracer will check against the AABBs first to know whether it needs to visit the cell's triangles.
//
// The building algorithm will divide the triangles recursively contained inside each cell, sorting by the longest axis of the AABB on each step.
//
// - If the amount of triangles is less or equal to the cluster size, the AABB will be stored and the algorithm stops.
//
// - The division by two is increased to the next power of two of half the amount of triangles (with cluster size as the minimum value) to
// ensure the first half always fills the cluster.
cluster_indices.resize(solid_cell_count * 2);
cluster_aabbs.resize(cluster_count);
uint32_t i = 0;
uint32_t cluster_index = 0;
uint32_t solid_cell_index = 0;
uint32_t *tiw = triangle_indices.ptrw();
while (i < triangle_sort.size()) {
cluster_indices[solid_cell_index * 2] = cluster_index;
cluster_indices[solid_cell_index * 2 + 1] = i;
uint32_t cell = triangle_sort[i].cell_index;
uint32_t triangle_count = giw[cell * 2];
uint32_t cell_cluster_count = (triangle_count + p_cluster_size - 1) / p_cluster_size;
_sort_triangle_clusters(p_cluster_size, cluster_index, i, triangle_count, triangle_sort, cluster_aabbs);
for (uint32_t j = 0; j < triangle_count; j++) {
tiw[i + j] = triangle_sort[i + j].triangle_index;
}
i += triangle_count;
cluster_index += cell_cluster_count;
solid_cell_index++;
}
}
#if 0
for (int i = 0; i < grid_size; i++) {
for (int j = 0; j < grid_size; j++) {
for (int k = 0; k < grid_size; k++) {
uint32_t index = i * (grid_size * grid_size) + j * grid_size + k;
grid_indices.write[index * 2] = float(i) / grid_size * 255;
grid_indices.write[index * 2 + 1] = float(j) / grid_size * 255;
}
}
}
#endif
#if 0
for (int i = 0; i < grid_size; i++) {
Vector<uint8_t> grid_usage;
grid_usage.resize(grid_size * grid_size);
for (int j = 0; j < grid_usage.size(); j++) {
uint32_t ofs = i * grid_size * grid_size + j;
uint32_t count = grid_indices[ofs * 2];
grid_usage.write[j] = count > 0 ? 255 : 0;
}
Ref<Image> img = Image::create_from_data(grid_size, grid_size, false, Image::FORMAT_L8, grid_usage);
img->save_png("res://grid_layer_" + itos(1000 + i).substr(1, 3) + ".png");
}
#endif
/*****************************/
/*** CREATE GPU STRUCTURES ***/
/*****************************/
lights.sort();
Vector<Vector2i> seam_buffer_vec;
seam_buffer_vec.resize(seams.size() * 2);
for (uint32_t i = 0; i < seams.size(); i++) {
seam_buffer_vec.write[i * 2 + 0] = seams[i].a;
seam_buffer_vec.write[i * 2 + 1] = seams[i].b;
}
{ //buffers
Vector<uint8_t> vb = vertex_array.to_byte_array();
vertex_buffer = rd->storage_buffer_create(vb.size(), vb);
Vector<uint8_t> tb = triangles.to_byte_array();
triangle_buffer = rd->storage_buffer_create(tb.size(), tb);
Vector<uint8_t> tib = triangle_indices.to_byte_array();
r_triangle_indices_buffer = rd->storage_buffer_create(tib.size(), tib);
Vector<uint8_t> cib = cluster_indices.to_byte_array();
r_cluster_indices_buffer = rd->storage_buffer_create(cib.size(), cib);
Vector<uint8_t> cab = cluster_aabbs.to_byte_array();
r_cluster_aabbs_buffer = rd->storage_buffer_create(cab.size(), cab);
Vector<uint8_t> lb = lights.to_byte_array();
if (lb.size() == 0) {
lb.resize(sizeof(Light)); //even if no lights, the buffer must exist
}
lights_buffer = rd->storage_buffer_create(lb.size(), lb);
Vector<uint8_t> sb = seam_buffer_vec.to_byte_array();
if (sb.size() == 0) {
sb.resize(sizeof(Vector2i) * 2); //even if no seams, the buffer must exist
}
seams_buffer = rd->storage_buffer_create(sb.size(), sb);
Vector<uint8_t> pb = p_probe_positions.to_byte_array();
if (pb.size() == 0) {
pb.resize(sizeof(Probe));
}
probe_positions_buffer = rd->storage_buffer_create(pb.size(), pb);
}
{ //grid
RD::TextureFormat tf;
tf.width = grid_size;
tf.height = grid_size;
tf.depth = grid_size;
tf.texture_type = RD::TEXTURE_TYPE_3D;
tf.usage_bits = RD::TEXTURE_USAGE_SAMPLING_BIT | RD::TEXTURE_USAGE_CAN_UPDATE_BIT;
Vector<Vector<uint8_t>> texdata;
texdata.resize(1);
//grid and indices
tf.format = RD::DATA_FORMAT_R32G32_UINT;
texdata.write[0] = grid_indices.to_byte_array();
grid_texture = rd->texture_create(tf, RD::TextureView(), texdata);
}
}
void LightmapperRD::_raster_geometry(RenderingDevice *rd, Size2i atlas_size, int atlas_slices, int grid_size, AABB bounds, float p_bias, Vector<int> slice_triangle_count, RID position_tex, RID unocclude_tex, RID normal_tex, RID raster_depth_buffer, RID rasterize_shader, RID raster_base_uniform) {
Vector<RID> framebuffers;
for (int i = 0; i < atlas_slices; i++) {
RID slice_pos_tex = rd->texture_create_shared_from_slice(RD::TextureView(), position_tex, i, 0);
RID slice_unoc_tex = rd->texture_create_shared_from_slice(RD::TextureView(), unocclude_tex, i, 0);
RID slice_norm_tex = rd->texture_create_shared_from_slice(RD::TextureView(), normal_tex, i, 0);
Vector<RID> fb;
fb.push_back(slice_pos_tex);
fb.push_back(slice_norm_tex);
fb.push_back(slice_unoc_tex);
fb.push_back(raster_depth_buffer);
framebuffers.push_back(rd->framebuffer_create(fb));
}
RD::PipelineDepthStencilState ds;
ds.enable_depth_test = true;
ds.enable_depth_write = true;
ds.depth_compare_operator = RD::COMPARE_OP_LESS; //so it does render same pixel twice
RID raster_pipeline = rd->render_pipeline_create(rasterize_shader, rd->framebuffer_get_format(framebuffers[0]), RD::INVALID_FORMAT_ID, RD::RENDER_PRIMITIVE_TRIANGLES, RD::PipelineRasterizationState(), RD::PipelineMultisampleState(), ds, RD::PipelineColorBlendState::create_disabled(3), 0);
RID raster_pipeline_wire;
{
RD::PipelineRasterizationState rw;
rw.wireframe = true;
raster_pipeline_wire = rd->render_pipeline_create(rasterize_shader, rd->framebuffer_get_format(framebuffers[0]), RD::INVALID_FORMAT_ID, RD::RENDER_PRIMITIVE_TRIANGLES, rw, RD::PipelineMultisampleState(), ds, RD::PipelineColorBlendState::create_disabled(3), 0);
}
uint32_t triangle_offset = 0;
Vector<Color> clear_colors;
clear_colors.push_back(Color(0, 0, 0, 0));
clear_colors.push_back(Color(0, 0, 0, 0));
clear_colors.push_back(Color(0, 0, 0, 0));
for (int i = 0; i < atlas_slices; i++) {
RasterPushConstant raster_push_constant;
raster_push_constant.atlas_size[0] = atlas_size.x;
raster_push_constant.atlas_size[1] = atlas_size.y;
raster_push_constant.base_triangle = triangle_offset;
raster_push_constant.to_cell_offset[0] = bounds.position.x;
raster_push_constant.to_cell_offset[1] = bounds.position.y;
raster_push_constant.to_cell_offset[2] = bounds.position.z;
raster_push_constant.bias = p_bias;
raster_push_constant.to_cell_size[0] = (1.0 / bounds.size.x) * float(grid_size);
raster_push_constant.to_cell_size[1] = (1.0 / bounds.size.y) * float(grid_size);
raster_push_constant.to_cell_size[2] = (1.0 / bounds.size.z) * float(grid_size);
raster_push_constant.grid_size[0] = grid_size;
raster_push_constant.grid_size[1] = grid_size;
raster_push_constant.grid_size[2] = grid_size;
// Half pixel offset is required so the rasterizer doesn't output face edges directly aligned into pixels.
// This fixes artifacts where the pixel would be traced from the edge of a face, causing half the rays to
// be outside of the boundaries of the geometry. See <https://github.com/godotengine/godot/issues/69126>.
raster_push_constant.uv_offset[0] = -0.5f / float(atlas_size.x);
raster_push_constant.uv_offset[1] = -0.5f / float(atlas_size.y);
RD::DrawListID draw_list = rd->draw_list_begin(framebuffers[i], RD::DRAW_CLEAR_ALL, clear_colors, 1.0f, 0, Rect2(), RDD::BreadcrumbMarker::LIGHTMAPPER_PASS);
//draw opaque
rd->draw_list_bind_render_pipeline(draw_list, raster_pipeline);
rd->draw_list_bind_uniform_set(draw_list, raster_base_uniform, 0);
rd->draw_list_set_push_constant(draw_list, &raster_push_constant, sizeof(RasterPushConstant));
rd->draw_list_draw(draw_list, false, 1, slice_triangle_count[i] * 3);
//draw wire
rd->draw_list_bind_render_pipeline(draw_list, raster_pipeline_wire);
rd->draw_list_bind_uniform_set(draw_list, raster_base_uniform, 0);
rd->draw_list_set_push_constant(draw_list, &raster_push_constant, sizeof(RasterPushConstant));
rd->draw_list_draw(draw_list, false, 1, slice_triangle_count[i] * 3);
rd->draw_list_end();
triangle_offset += slice_triangle_count[i];
}
}
static Vector<RD::Uniform> dilate_or_denoise_common_uniforms(RID &p_source_light_tex, RID &p_dest_light_tex) {
Vector<RD::Uniform> uniforms;
{
RD::Uniform u;
u.uniform_type = RD::UNIFORM_TYPE_IMAGE;
u.binding = 0;
u.append_id(p_dest_light_tex);
uniforms.push_back(u);
}
{
RD::Uniform u;
u.uniform_type = RD::UNIFORM_TYPE_TEXTURE;
u.binding = 1;
u.append_id(p_source_light_tex);
uniforms.push_back(u);
}
return uniforms;
}
LightmapperRD::BakeError LightmapperRD::_dilate(RenderingDevice *rd, Ref<RDShaderFile> &compute_shader, RID &compute_base_uniform_set, PushConstant &push_constant, RID &source_light_tex, RID &dest_light_tex, const Size2i &atlas_size, int atlas_slices) {
Vector<RD::Uniform> uniforms = dilate_or_denoise_common_uniforms(source_light_tex, dest_light_tex);
RID compute_shader_dilate = rd->shader_create_from_spirv(compute_shader->get_spirv_stages("dilate"));
ERR_FAIL_COND_V(compute_shader_dilate.is_null(), BAKE_ERROR_LIGHTMAP_CANT_PRE_BAKE_MESHES); //internal check, should not happen
RID compute_shader_dilate_pipeline = rd->compute_pipeline_create(compute_shader_dilate);
RID dilate_uniform_set = rd->uniform_set_create(uniforms, compute_shader_dilate, 1);
RD::ComputeListID compute_list = rd->compute_list_begin();
rd->compute_list_bind_compute_pipeline(compute_list, compute_shader_dilate_pipeline);
rd->compute_list_bind_uniform_set(compute_list, compute_base_uniform_set, 0);
rd->compute_list_bind_uniform_set(compute_list, dilate_uniform_set, 1);
push_constant.region_ofs[0] = 0;
push_constant.region_ofs[1] = 0;
Vector3i group_size(Math::division_round_up(atlas_size.x, 8), Math::division_round_up(atlas_size.y, 8), 1); //restore group size
for (int i = 0; i < atlas_slices; i++) {
push_constant.atlas_slice = i;
rd->compute_list_set_push_constant(compute_list, &push_constant, sizeof(PushConstant));
rd->compute_list_dispatch(compute_list, group_size.x, group_size.y, group_size.z);
//no barrier, let them run all together
}
rd->compute_list_end();
rd->free(compute_shader_dilate);
#ifdef DEBUG_TEXTURES
for (int i = 0; i < atlas_slices; i++) {
Vector<uint8_t> s = rd->texture_get_data(source_light_tex, i);
Ref<Image> img = Image::create_from_data(atlas_size.width, atlas_size.height, false, Image::FORMAT_RGBAH, s);
img->convert(Image::FORMAT_RGBA8);
img->save_png("res://5_dilated_" + itos(i) + ".png");
}
#endif
return BAKE_OK;
}
LightmapperRD::BakeError LightmapperRD::_pack_l1(RenderingDevice *rd, Ref<RDShaderFile> &compute_shader, RID &compute_base_uniform_set, PushConstant &push_constant, RID &source_light_tex, RID &dest_light_tex, const Size2i &atlas_size, int atlas_slices) {
Vector<RD::Uniform> uniforms = dilate_or_denoise_common_uniforms(source_light_tex, dest_light_tex);
RID compute_shader_pack = rd->shader_create_from_spirv(compute_shader->get_spirv_stages("pack_coeffs"));
ERR_FAIL_COND_V(compute_shader_pack.is_null(), BAKE_ERROR_LIGHTMAP_CANT_PRE_BAKE_MESHES); //internal check, should not happen
RID compute_shader_pack_pipeline = rd->compute_pipeline_create(compute_shader_pack);
RID dilate_uniform_set = rd->uniform_set_create(uniforms, compute_shader_pack, 1);
RD::ComputeListID compute_list = rd->compute_list_begin();
rd->compute_list_bind_compute_pipeline(compute_list, compute_shader_pack_pipeline);
rd->compute_list_bind_uniform_set(compute_list, compute_base_uniform_set, 0);
rd->compute_list_bind_uniform_set(compute_list, dilate_uniform_set, 1);
push_constant.region_ofs[0] = 0;
push_constant.region_ofs[1] = 0;
Vector3i group_size(Math::division_round_up(atlas_size.x, 8), Math::division_round_up(atlas_size.y, 8), 1); //restore group size
for (int i = 0; i < atlas_slices; i++) {
push_constant.atlas_slice = i;
rd->compute_list_set_push_constant(compute_list, &push_constant, sizeof(PushConstant));
rd->compute_list_dispatch(compute_list, group_size.x, group_size.y, group_size.z);
//no barrier, let them run all together
}
rd->compute_list_end();
rd->free(compute_shader_pack);
return BAKE_OK;
}
Error LightmapperRD::_store_pfm(RenderingDevice *p_rd, RID p_atlas_tex, int p_index, const Size2i &p_atlas_size, const String &p_name, bool p_shadowmask) {
Vector<uint8_t> data = p_rd->texture_get_data(p_atlas_tex, p_index);
Ref<Image> img = Image::create_from_data(p_atlas_size.width, p_atlas_size.height, false, p_shadowmask ? Image::FORMAT_RGBA8 : Image::FORMAT_RGBAH, data);
img->convert(Image::FORMAT_RGBF);
Vector<uint8_t> data_float = img->get_data();
Error err = OK;
Ref<FileAccess> file = FileAccess::open(p_name, FileAccess::WRITE, &err);
ERR_FAIL_COND_V_MSG(err, err, vformat("Can't save PFN at path: '%s'.", p_name));
file->store_line("PF");
file->store_line(vformat("%d %d", img->get_width(), img->get_height()));
#ifdef BIG_ENDIAN_ENABLED
file->store_line("1.0");
#else
file->store_line("-1.0");
#endif
file->store_buffer(data_float);
file->close();
return OK;
}
Ref<Image> LightmapperRD::_read_pfm(const String &p_name, bool p_shadowmask) {
Error err = OK;
Ref<FileAccess> file = FileAccess::open(p_name, FileAccess::READ, &err);
ERR_FAIL_COND_V_MSG(err, Ref<Image>(), vformat("Can't load PFM at path: '%s'.", p_name));
ERR_FAIL_COND_V(file->get_line() != "PF", Ref<Image>());
Vector<String> new_size = file->get_line().split(" ");
ERR_FAIL_COND_V(new_size.size() != 2, Ref<Image>());
int new_width = new_size[0].to_int();
int new_height = new_size[1].to_int();
float endian = file->get_line().to_float();
Vector<uint8_t> new_data = file->get_buffer(file->get_length() - file->get_position());
file->close();
#ifdef BIG_ENDIAN_ENABLED
if (unlikely(endian < 0.0)) {
uint32_t count = new_data.size() / 4;
uint16_t *dst = (uint16_t *)new_data.ptrw();
for (uint32_t j = 0; j < count; j++) {
dst[j * 4] = BSWAP32(dst[j * 4]);
}
}
#else
if (unlikely(endian > 0.0)) {
uint32_t count = new_data.size() / 4;
uint16_t *dst = (uint16_t *)new_data.ptrw();
for (uint32_t j = 0; j < count; j++) {
dst[j * 4] = BSWAP32(dst[j * 4]);
}
}
#endif
Ref<Image> img = Image::create_from_data(new_width, new_height, false, Image::FORMAT_RGBF, new_data);
img->convert(p_shadowmask ? Image::FORMAT_RGBA8 : Image::FORMAT_RGBAH);
return img;
}
LightmapperRD::BakeError LightmapperRD::_denoise_oidn(RenderingDevice *p_rd, RID p_source_light_tex, RID p_source_normal_tex, RID p_dest_light_tex, const Size2i &p_atlas_size, int p_atlas_slices, bool p_bake_sh, bool p_shadowmask, const String &p_exe) {
Ref<DirAccess> da = DirAccess::create(DirAccess::ACCESS_FILESYSTEM);
for (int i = 0; i < p_atlas_slices; i++) {
String fname_norm_in = EditorPaths::get_singleton()->get_cache_dir().path_join(vformat("temp_norm_%d.pfm", i));
_store_pfm(p_rd, p_source_normal_tex, i, p_atlas_size, fname_norm_in, false);
for (int j = 0; j < (p_bake_sh ? 4 : 1); j++) {
int index = i * (p_bake_sh ? 4 : 1) + j;
String fname_light_in = EditorPaths::get_singleton()->get_cache_dir().path_join(vformat("temp_light_%d.pfm", index));
String fname_out = EditorPaths::get_singleton()->get_cache_dir().path_join(vformat("temp_denoised_%d.pfm", index));
_store_pfm(p_rd, p_source_light_tex, index, p_atlas_size, fname_light_in, p_shadowmask);
List<String> args;
args.push_back("--device");
args.push_back("default");
args.push_back("--filter");
args.push_back("RTLightmap");
args.push_back(p_shadowmask ? "--ldr" : "--hdr");
args.push_back(fname_light_in);
args.push_back("--nrm");
args.push_back(fname_norm_in);
args.push_back("--output");
args.push_back(fname_out);
String str;
int exitcode = 0;
Error err = OS::get_singleton()->execute(p_exe, args, &str, &exitcode, true);
da->remove(fname_light_in);
if (err != OK || exitcode != 0) {
da->remove(fname_out);
print_verbose(str);
ERR_FAIL_V_MSG(BAKE_ERROR_LIGHTMAP_CANT_PRE_BAKE_MESHES, vformat("OIDN denoiser failed, return code: %d", exitcode));
}
Ref<Image> img = _read_pfm(fname_out, p_shadowmask);
da->remove(fname_out);
ERR_FAIL_COND_V(img.is_null(), BAKE_ERROR_LIGHTMAP_CANT_PRE_BAKE_MESHES);
Vector<uint8_t> old_data = p_rd->texture_get_data(p_source_light_tex, index);
Vector<uint8_t> new_data = img->get_data();
img.unref(); // Avoid copy on write.
uint32_t count = old_data.size() / 2;
const uint16_t *src = (const uint16_t *)old_data.ptr();
uint16_t *dst = (uint16_t *)new_data.ptrw();
for (uint32_t k = 0; k < count; k += 4) {
dst[k + 3] = src[k + 3];
}
p_rd->texture_update(p_dest_light_tex, index, new_data);
}
da->remove(fname_norm_in);
}
return BAKE_OK;
}
LightmapperRD::BakeError LightmapperRD::_denoise(RenderingDevice *p_rd, Ref<RDShaderFile> &p_compute_shader, const RID &p_compute_base_uniform_set, PushConstant &p_push_constant, RID p_source_light_tex, RID p_source_normal_tex, RID p_dest_light_tex, float p_denoiser_strength, int p_denoiser_range, const Size2i &p_atlas_size, int p_atlas_slices, bool p_bake_sh, BakeStepFunc p_step_function, void *p_bake_userdata) {
RID denoise_params_buffer = p_rd->uniform_buffer_create(sizeof(DenoiseParams));
DenoiseParams denoise_params;
denoise_params.spatial_bandwidth = 5.0f;
denoise_params.light_bandwidth = p_denoiser_strength;
denoise_params.albedo_bandwidth = 1.0f;
denoise_params.normal_bandwidth = 0.1f;
denoise_params.filter_strength = 10.0f;
denoise_params.half_search_window = p_denoiser_range;
p_rd->buffer_update(denoise_params_buffer, 0, sizeof(DenoiseParams), &denoise_params);
Vector<RD::Uniform> uniforms = dilate_or_denoise_common_uniforms(p_source_light_tex, p_dest_light_tex);
{
RD::Uniform u;
u.uniform_type = RD::UNIFORM_TYPE_TEXTURE;
u.binding = 2;
u.append_id(p_source_normal_tex);
uniforms.push_back(u);
}
{
RD::Uniform u;
u.uniform_type = RD::UNIFORM_TYPE_UNIFORM_BUFFER;
u.binding = 3;
u.append_id(denoise_params_buffer);
uniforms.push_back(u);
}
RID compute_shader_denoise = p_rd->shader_create_from_spirv(p_compute_shader->get_spirv_stages("denoise"));
ERR_FAIL_COND_V(compute_shader_denoise.is_null(), BAKE_ERROR_LIGHTMAP_CANT_PRE_BAKE_MESHES);
RID compute_shader_denoise_pipeline = p_rd->compute_pipeline_create(compute_shader_denoise);
RID denoise_uniform_set = p_rd->uniform_set_create(uniforms, compute_shader_denoise, 1);