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virtualx-engine/scene/3d/baked_lightmap.h
JFonS 112b416056 Implement new CPU lightmapper 
Completely re-write the lightmap generation code:
- Follow the general lightmapper code structure from 4.0.
- Use proper path tracing to compute the global illumination.
- Use atlassing to merge all lightmaps into a single texture (done by @RandomShaper)
- Use OpenImageDenoiser to improve the generated lightmaps.
- Take into account alpha transparency in material textures.
- Allow baking environment lighting.
- Add bicubic lightmap filtering.

There is some minor compatibility breakage in some properties and methods
in BakedLightmap, but lightmaps generated in previous engine versions
should work fine out of the box.

The scene importer has been changed to generate `.unwrap_cache` files
next to the imported scene files. These files *SHOULD* be added to any
version control system as they guarantee there won't be differences when
re-importing the scene from other OSes or engine versions.

This work started as a Google Summer of Code project; Was later funded by IMVU for a good amount of progress;
Was then finished and polished by me on my free time.

Co-authored-by: Pedro J. Estébanez <pedrojrulez@gmail.com>
2021-01-14 18:05:56 +01:00

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/*************************************************************************/
/* baked_lightmap.h */
/*************************************************************************/
/* This file is part of: */
/* GODOT ENGINE */
/* https://godotengine.org */
/*************************************************************************/
/* Copyright (c) 2007-2021 Juan Linietsky, Ariel Manzur. */
/* Copyright (c) 2014-2021 Godot Engine contributors (cf. AUTHORS.md). */
/* */
/* 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. */
/*************************************************************************/
#ifndef BAKED_INDIRECT_LIGHT_H
#define BAKED_INDIRECT_LIGHT_H
#include "core/local_vector.h"
#include "multimesh_instance.h"
#include "scene/3d/light.h"
#include "scene/3d/lightmapper.h"
#include "scene/3d/visual_instance.h"
class BakedLightmapData : public Resource {
GDCLASS(BakedLightmapData, Resource);
RES_BASE_EXTENSION("lmbake")
RID baked_light;
AABB bounds;
float energy;
int cell_subdiv;
Transform cell_space_xform;
struct User {
NodePath path;
struct {
Ref<Texture> single;
Ref<TextureLayered> layered;
} lightmap;
int lightmap_slice;
Rect2 lightmap_uv_rect;
int instance_index;
};
Vector<User> users;
void _set_user_data(const Array &p_data);
Array _get_user_data() const;
protected:
static void _bind_methods();
public:
void set_bounds(const AABB &p_bounds);
AABB get_bounds() const;
void set_octree(const PoolVector<uint8_t> &p_octree);
PoolVector<uint8_t> get_octree() const;
void set_cell_space_transform(const Transform &p_xform);
Transform get_cell_space_transform() const;
void set_cell_subdiv(int p_cell_subdiv);
int get_cell_subdiv() const;
void set_energy(float p_energy);
float get_energy() const;
void add_user(const NodePath &p_path, const Ref<Resource> &p_lightmap, int p_lightmap_slice, const Rect2 &p_lightmap_uv_rect, int p_instance);
int get_user_count() const;
NodePath get_user_path(int p_user) const;
Ref<Resource> get_user_lightmap(int p_user) const;
int get_user_lightmap_slice(int p_user) const;
Rect2 get_user_lightmap_uv_rect(int p_user) const;
int get_user_instance(int p_user) const;
void clear_users();
virtual RID get_rid() const;
BakedLightmapData();
~BakedLightmapData();
};
class BakedLightmap : public VisualInstance {
GDCLASS(BakedLightmap, VisualInstance);
public:
enum BakeQuality {
BAKE_QUALITY_LOW,
BAKE_QUALITY_MEDIUM,
BAKE_QUALITY_HIGH,
BAKE_QUALITY_ULTRA
};
enum BakeError {
BAKE_ERROR_OK,
BAKE_ERROR_NO_SAVE_PATH,
BAKE_ERROR_NO_MESHES,
BAKE_ERROR_CANT_CREATE_IMAGE,
BAKE_ERROR_LIGHTMAP_SIZE,
BAKE_ERROR_INVALID_MESH,
BAKE_ERROR_USER_ABORTED,
BAKE_ERROR_NO_LIGHTMAPPER
};
enum EnvironmentMode {
ENVIRONMENT_MODE_DISABLED,
ENVIRONMENT_MODE_SCENE,
ENVIRONMENT_MODE_CUSTOM_SKY,
ENVIRONMENT_MODE_CUSTOM_COLOR
};
struct BakeStepUD {
Lightmapper::BakeStepFunc func;
void *ud;
float from_percent;
float to_percent;
};
struct LightsFound {
Transform xform;
Light *light;
};
struct MeshesFound {
Transform xform;
NodePath node_path;
int32_t subindex;
Ref<Mesh> mesh;
int32_t lightmap_scale;
Vector<Ref<Material> > overrides;
bool cast_shadows;
bool generate_lightmap;
};
private:
Vector3 extents;
float default_texels_per_unit;
float bias;
BakeQuality bake_quality;
bool generate_atlas;
int max_atlas_size;
bool capture_enabled;
int bounces;
bool use_denoiser;
EnvironmentMode environment_mode;
Ref<Sky> environment_custom_sky;
Vector3 environment_custom_sky_rotation_degrees;
Color environment_custom_color;
float environment_custom_energy;
BakeQuality capture_quality;
float capture_propagation;
float capture_cell_size;
String image_path; // (Deprecated property)
Ref<BakedLightmapData> light_data;
void _assign_lightmaps();
void _clear_lightmaps();
void _get_material_images(const MeshesFound &p_found_mesh, Lightmapper::MeshData &r_mesh_data, Vector<Ref<Texture> > &r_albedo_textures, Vector<Ref<Texture> > &r_emission_textures);
Ref<Image> _get_irradiance_from_sky(Ref<Sky> p_sky, Vector2i p_size);
Ref<Image> _get_irradiance_map(Ref<Environment> p_env, Vector2i p_size);
void _find_meshes_and_lights(Node *p_at_node, Vector<MeshesFound> &meshes, Vector<LightsFound> &lights);
Vector2i _compute_lightmap_size(const MeshesFound &p_mesh);
static bool _lightmap_bake_step_function(float p_completion, const String &p_text, void *ud, bool p_refresh);
protected:
static void _bind_methods();
void _validate_property(PropertyInfo &property) const;
void _notification(int p_what);
public:
static Lightmapper::BakeStepFunc bake_step_function;
static Lightmapper::BakeStepFunc bake_substep_function;
void set_light_data(const Ref<BakedLightmapData> &p_data);
Ref<BakedLightmapData> get_light_data() const;
void set_capture_cell_size(float p_cell_size);
float get_capture_cell_size() const;
void set_extents(const Vector3 &p_extents);
Vector3 get_extents() const;
void set_default_texels_per_unit(const float &p_extents);
float get_default_texels_per_unit() const;
void set_capture_propagation(float p_propagation);
float get_capture_propagation() const;
void set_capture_quality(BakeQuality p_quality);
BakeQuality get_capture_quality() const;
void set_bake_quality(BakeQuality p_quality);
BakeQuality get_bake_quality() const;
void set_generate_atlas(bool p_enabled);
bool is_generate_atlas_enabled() const;
void set_max_atlas_size(int p_size);
int get_max_atlas_size() const;
void set_capture_enabled(bool p_enable);
bool get_capture_enabled() const;
void set_image_path(const String &p_path);
String get_image_path() const;
void set_environment_mode(EnvironmentMode p_mode);
EnvironmentMode get_environment_mode() const;
void set_environment_custom_sky(const Ref<Sky> &p_sky);
Ref<Sky> get_environment_custom_sky() const;
void set_environment_custom_sky_rotation_degrees(const Vector3 &p_rotation);
Vector3 get_environment_custom_sky_rotation_degrees() const;
void set_environment_custom_color(const Color &p_color);
Color get_environment_custom_color() const;
void set_environment_custom_energy(float p_energy);
float get_environment_custom_energy() const;
void set_use_denoiser(bool p_enable);
bool is_using_denoiser() const;
void set_bounces(int p_bounces);
int get_bounces() const;
void set_bias(float p_bias);
float get_bias() const;
AABB get_aabb() const;
PoolVector<Face3> get_faces(uint32_t p_usage_flags) const;
BakeError bake(Node *p_from_node, String p_data_save_path = "");
BakedLightmap();
};
VARIANT_ENUM_CAST(BakedLightmap::BakeQuality);
VARIANT_ENUM_CAST(BakedLightmap::BakeError);
VARIANT_ENUM_CAST(BakedLightmap::EnvironmentMode);
#endif // BAKED_INDIRECT_LIGHT_H
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