/*
Copyright (c) 2019-2022 Péter Magyar

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 "terrain_2d_library_merger_pcm.h"

#include "../../texture_packer/texture_packer.h"
#include "scene/resources/packed_scene.h"
#include "scene/resources/texture.h"

#ifdef PROPS_2D_PRESENT
#include "../../props_2d/props/prop_2d_data.h"

#include "../../props_2d/props/prop_2d_data_prop.h"

#if MESH_DATA_RESOURCE_PRESENT
#include "../../mesh_data_resource/props_2d/prop_2d_data_mesh_data.h"
#endif
#endif

#include "../defines.h"
#include "../world/default/terrain_2d_chunk_default.h"
#include "core/hashfuncs.h"
#include "core/message_queue.h"
#include "terrain_2d_material_cache_pcm.h"

bool Terrain2DLibraryMergerPCM::_supports_caching() {
	return true;
}

void Terrain2DLibraryMergerPCM::_material_cache_get_key(Ref<Terrain2DChunk> chunk) {
	uint8_t *ch = chunk->channel_get(Terrain2DChunkDefault::DEFAULT_CHANNEL_TYPE);

	if (!ch) {
		chunk->material_cache_key_set(0);
		chunk->material_cache_key_has_set(false);

		return;
	}

	Vector<uint8_t> surfaces;

	uint32_t size = chunk->get_data_size();

	for (uint32_t i = 0; i < size; ++i) {
		uint8_t v = ch[i];

		if (v == 0) {
			continue;
		}

		int ssize = surfaces.size();
		bool found = false;
		for (uint8_t j = 0; j < ssize; ++j) {
			if (surfaces[j] == v) {
				found = true;
				break;
			}
		}

		if (!found) {
			surfaces.push_back(v);
		}
	}

	uint8_t *liquid_ch = chunk->channel_get(Terrain2DChunkDefault::DEFAULT_CHANNEL_LIQUID_TYPE);

	if (liquid_ch) {
		for (uint32_t i = 0; i < size; ++i) {
			uint8_t v = liquid_ch[i];

			if (v == 0) {
				continue;
			}

			int ssize = surfaces.size();
			bool found = false;
			for (uint8_t j = 0; j < ssize; ++j) {
				if (surfaces[j] == v) {
					found = true;
					break;
				}
			}

			if (!found) {
				surfaces.push_back(v);
			}
		}
	}

	if (surfaces.size() == 0) {
		chunk->material_cache_key_set(0);
		chunk->material_cache_key_has_set(false);

		return;
	}

	surfaces.sort();

	String hstr;

	for (int i = 0; i < surfaces.size(); ++i) {
		hstr += String::num(surfaces[i]) + "|";
	}

	int hash = static_cast<int>(hstr.hash());

	chunk->material_cache_key_set(hash);
	chunk->material_cache_key_has_set(true);

	_material_cache_mutex.lock();

	if (_material_cache.has(hash)) {
		Ref<Terrain2DMaterialCachePCM> cc = _material_cache[hash];

		if (cc.is_valid()) {
			cc->inc_ref_count();
		}

		_material_cache_mutex.unlock();

		return;
	}

	//print_error("New cache: " + hstr);

	Ref<Terrain2DMaterialCachePCM> cache;
	cache.instance();
	cache->inc_ref_count();

	cache->set_texture_flags(get_texture_flags());
	cache->set_max_atlas_size(get_max_atlas_size());
	cache->set_keep_original_atlases(get_keep_original_atlases());
	cache->set_background_color(get_background_color());
	cache->set_margin(get_margin());

	for (int i = 0; i < surfaces.size(); ++i) {
		int s = surfaces[i] - 1;

		if (_terra_surfaces.size() <= s) {
			continue;
		}

		Ref<Terrain2DSurfaceMerger> ms = _terra_surfaces[s];

		if (!ms.is_valid()) {
			continue;
		}

		Ref<Terrain2DSurfaceMerger> nms = ms->duplicate();
		nms->set_library(Ref<Terrain2DLibraryMergerPCM>(this));
		nms->set_id(s);

		cache->surface_add(nms);
	}

	if (_material.is_valid()) {
		Ref<Material> nm = _material->duplicate();
		cache->material_set(nm);
	}

	_material_cache[hash] = cache;

	//unlock here, so if a different thread need the cache it will be able to immediately access the materials and surfaces when it gets it.
	_material_cache_mutex.unlock();

	//this will generate the atlases
	cache->refresh_rects();
}

Ref<Terrain2DMaterialCache> Terrain2DLibraryMergerPCM::_material_cache_get(const int key) {
	_material_cache_mutex.lock();

	ERR_FAIL_COND_V(!_material_cache.has(key), Ref<Terrain2DMaterialCache>());

	Ref<Terrain2DMaterialCache> c = _material_cache[key];

	_material_cache_mutex.unlock();

	return c;
}

void Terrain2DLibraryMergerPCM::_material_cache_unref(const int key) {
	if (_material_cache_mutex.try_lock() != OK) {
		// If we don't get the lock try again later
		// This is needed, because when duplicating materials the VisualServer apparently
		// needs synchronization with the main thread. So if _material_cache_unref holds the mutex
		// and is duplicating the materials, trying to get the lock from the main thread will deadlock
		// the game. This can happen when chungs are spawned and despawned really fast.
		// E.g. when flying around in the editor.
		MessageQueue::get_singleton()->push_call(this, "_material_cache_unref", key, 1);
		return;
	}

	//_material_cache_mutex.lock();

	if (!_material_cache.has(key)) {
		return;
	}

	Ref<Terrain2DMaterialCachePCM> cc = _material_cache[key];

	if (!cc.is_valid()) {
		return;
	}

	cc->dec_ref_count();

	if (cc->get_ref_count() <= 0) {
		_material_cache.erase(key);
	}

	_material_cache_mutex.unlock();
}

void Terrain2DLibraryMergerPCM::_prop_material_cache_get_key(Ref<Terrain2DChunk> chunk) {
	Vector<uint64_t> props;

	/*
	#ifdef PROPS_2D_PRESENT
		for (int i = 0; i < chunk->prop_get_count(); ++i) {
			Ref<Prop2DData> prop = chunk->prop_get(i);

			ERR_CONTINUE(!prop.is_valid());

			//get pointer's value as uint64
			uint64_t v = make_uint64_t<Prop2DData *>(*prop);

			int psize = props.size();
			bool found = false;
			for (int j = 0; j < psize; ++j) {
				if (props[j] == v) {
					found = true;
					break;
				}
			}

			if (!found) {
				props.push_back(v);
			}
		}
	#endif
	*/

#if MESH_DATA_RESOURCE_PRESENT
	for (int i = 0; i < chunk->mesh_data_resource_get_count(); ++i) {
		Ref<Texture> tex = chunk->mesh_data_resource_get_texture(i);

		if (!tex.is_valid())
			continue;

		//get pointer's value as uint64
		uint64_t v = make_uint64_t<Texture *>(*tex);

		int psize = props.size();
		bool found = false;
		for (int j = 0; j < psize; ++j) {
			if (props[j] == v) {
				found = true;
				break;
			}
		}

		if (!found) {
			props.push_back(v);
		}
	}
#endif

	if (props.size() == 0) {
		chunk->prop_material_cache_key_set(0);
		chunk->prop_material_cache_key_has_set(false);

		return;
	}

	props.sort();

	String hstr;

	for (int i = 0; i < props.size(); ++i) {
		hstr += String::num_uint64(props[i]) + "|";
	}

	int hash = static_cast<int>(hstr.hash());

	chunk->prop_material_cache_key_set(hash);
	chunk->prop_material_cache_key_has_set(true);

	_prop_material_cache_mutex.lock();

	if (_prop_material_cache.has(hash)) {
		Ref<Terrain2DMaterialCachePCM> cc = _prop_material_cache[hash];

		if (cc.is_valid()) {
			cc->inc_ref_count();
		}

		_prop_material_cache_mutex.unlock();

		return;
	}

	//print_error("New prop cache: " + hstr);

	Ref<Terrain2DMaterialCachePCM> cache;
	cache.instance();
	cache->inc_ref_count();

	cache->set_texture_flags(get_texture_flags());
	cache->set_max_atlas_size(get_max_atlas_size());
	cache->set_keep_original_atlases(get_keep_original_atlases());
	cache->set_background_color(get_background_color());
	cache->set_margin(get_margin());

	if (_prop_material.is_valid()) {
		Ref<Material> nm = _prop_material->duplicate();

		cache->material_set(nm);
	}

	/*
	#ifdef PROPS_2D_PRESENT
		for (int i = 0; i < chunk->prop_get_count(); ++i) {
			Ref<Prop2DData> prop = chunk->prop_get(i);

			ERR_CONTINUE(!prop.is_valid());

			cache->prop_add_textures(prop);
		}
	#endif
	*/

#if MESH_DATA_RESOURCE_PRESENT
	for (int i = 0; i < chunk->mesh_data_resource_get_count(); ++i) {
		Ref<Texture> tex = chunk->mesh_data_resource_get_texture(i);

		if (!tex.is_valid())
			continue;

		cache->additional_texture_add(tex);
	}
#endif

	_prop_material_cache[hash] = cache;

	//unlock here, so if a different thread need the cache it will be able to immediately access the materials and surfaces when it gets it.
	_prop_material_cache_mutex.unlock();

	//this will generate the atlases
	cache->refresh_rects();
}
Ref<Terrain2DMaterialCache> Terrain2DLibraryMergerPCM::_prop_material_cache_get(const int key) {
	_prop_material_cache_mutex.lock();

	ERR_FAIL_COND_V(!_prop_material_cache.has(key), Ref<Terrain2DMaterialCache>());

	Ref<Terrain2DMaterialCache> c = _prop_material_cache[key];

	_prop_material_cache_mutex.unlock();

	return c;
}
void Terrain2DLibraryMergerPCM::_prop_material_cache_unref(const int key) {
	if (_prop_material_cache_mutex.try_lock() != OK) {
		// If we don't get the lock try again later
		// This is needed, because when duplicating materials the VisualServer apparently
		// needs synchronization with the main thread. So if _prop_material_cache_get_key holds the mutex
		// and is duplicating the materials, trying to get the lock from the main thread will deadlock
		// the game. This can happen when chungs are spawned and despawned really fast.
		// E.g. when flying around in the editor.
		MessageQueue::get_singleton()->push_call(this, "_prop_material_cache_unref", key, 1);
		return;
	}

	//_prop_material_cache_mutex.lock();

	if (!_prop_material_cache.has(key)) {
		return;
	}

	Ref<Terrain2DMaterialCachePCM> cc = _prop_material_cache[key];

	if (!cc.is_valid()) {
		return;
	}

	cc->dec_ref_count();

	if (cc->get_ref_count() <= 0) {
		_prop_material_cache.erase(key);
	}

	_prop_material_cache_mutex.unlock();
}

int Terrain2DLibraryMergerPCM::get_texture_flags() const {
	return _packer->get_texture_flags();
}
void Terrain2DLibraryMergerPCM::set_texture_flags(const int flags) {
	_packer->set_texture_flags(flags);
	_prop_packer->set_texture_flags(flags);
}

int Terrain2DLibraryMergerPCM::get_max_atlas_size() const {
	return _packer->get_max_atlas_size();
}
void Terrain2DLibraryMergerPCM::set_max_atlas_size(const int size) {
	_packer->set_max_atlas_size(size);
	_prop_packer->set_max_atlas_size(size);
}

bool Terrain2DLibraryMergerPCM::get_keep_original_atlases() const {
	return _packer->get_keep_original_atlases();
}
void Terrain2DLibraryMergerPCM::set_keep_original_atlases(const bool value) {
	_packer->set_keep_original_atlases(value);
	_prop_packer->set_keep_original_atlases(value);
}

Color Terrain2DLibraryMergerPCM::get_background_color() const {
	return _packer->get_background_color();
}
void Terrain2DLibraryMergerPCM::set_background_color(const Color &color) {
	_packer->set_background_color(color);
	_prop_packer->set_background_color(color);
}

int Terrain2DLibraryMergerPCM::get_margin() const {
	return _packer->get_margin();
}
void Terrain2DLibraryMergerPCM::set_margin(const int margin) {
	_packer->set_margin(margin);
	_prop_packer->set_margin(margin);
}

//Surfaces
Ref<Terrain2DSurface> Terrain2DLibraryMergerPCM::terra_surface_get(const int index) {
	ERR_FAIL_INDEX_V(index, _terra_surfaces.size(), Ref<Terrain2DSurface>(NULL));

	return _terra_surfaces[index];
}

void Terrain2DLibraryMergerPCM::terra_surface_add(Ref<Terrain2DSurface> value) {
	ERR_FAIL_COND(!value.is_valid());

	value->set_library(Ref<Terrain2DLibraryMergerPCM>(this));
	value->set_id(_terra_surfaces.size());

	_terra_surfaces.push_back(value);
}

void Terrain2DLibraryMergerPCM::terra_surface_set(const int index, Ref<Terrain2DSurface> value) {
	ERR_FAIL_COND(index < 0);

	if (_terra_surfaces.size() < index) {
		_terra_surfaces.resize(index + 1);
	}

	if (_terra_surfaces[index].is_valid()) {
		_terra_surfaces.get(index)->set_library(Ref<Terrain2DLibraryMergerPCM>(NULL));
	}

	if (value.is_valid()) {
		value->set_library(Ref<Terrain2DLibraryMergerPCM>(this));

		_terra_surfaces.set(index, value);
	}
}

void Terrain2DLibraryMergerPCM::terra_surface_remove(const int index) {
	_terra_surfaces.remove(index);
}

int Terrain2DLibraryMergerPCM::terra_surface_get_num() const {
	return _terra_surfaces.size();
}

void Terrain2DLibraryMergerPCM::terra_surfaces_clear() {
	_packer->clear();

	for (int i = 0; i < _terra_surfaces.size(); i++) {
		Ref<Terrain2DSurfaceMerger> surface = _terra_surfaces[i];

		if (surface.is_valid()) {
			surface->set_library(NULL);
		}
	}

	_terra_surfaces.clear();
}

Vector<Variant> Terrain2DLibraryMergerPCM::get_terra_surfaces() {
	VARIANT_ARRAY_GET(_terra_surfaces);
}

void Terrain2DLibraryMergerPCM::set_terra_surfaces(const Vector<Variant> &surfaces) {
	_terra_surfaces.clear();

	for (int i = 0; i < surfaces.size(); i++) {
		Ref<Terrain2DSurfaceMerger> surface = Ref<Terrain2DSurfaceMerger>(surfaces[i]);

		if (surface.is_valid()) {
			surface->set_library(Ref<Terrain2DLibraryMergerPCM>(this));
		}

		_terra_surfaces.push_back(surface);
	}
}

#ifdef PROPS_2D_PRESENT
Ref<Prop2DData> Terrain2DLibraryMergerPCM::get_prop(const int index) {
	ERR_FAIL_INDEX_V(index, _props.size(), Ref<Prop2DData>());

	return _props[index];
}
void Terrain2DLibraryMergerPCM::add_prop(Ref<Prop2DData> value) {
	_props.push_back(value);
}
bool Terrain2DLibraryMergerPCM::has_prop(const Ref<Prop2DData> &value) const {
	return _props.find(value) != -1;
}
void Terrain2DLibraryMergerPCM::set_prop(const int index, const Ref<Prop2DData> &value) {
	ERR_FAIL_INDEX(index, _props.size());

	_props.write[index] = value;
}
void Terrain2DLibraryMergerPCM::remove_prop(const int index) {
	ERR_FAIL_INDEX(index, _props.size());

	_props.remove(index);
}
int Terrain2DLibraryMergerPCM::get_num_props() const {
	return _props.size();
}
void Terrain2DLibraryMergerPCM::clear_props() {
	_props.clear();
}

Vector<Variant> Terrain2DLibraryMergerPCM::get_props() {
	VARIANT_ARRAY_GET(_props);
}

void Terrain2DLibraryMergerPCM::set_props(const Vector<Variant> &props) {
	VARIANT_ARRAY_SET(props, _props, Prop2DData);
}

Rect2 Terrain2DLibraryMergerPCM::get_prop_uv_rect(const Ref<Texture> &texture) {
	if (!texture.is_valid()) {
		return Rect2(0, 0, 1, 1);
	}

	Ref<AtlasTexture> at = _prop_packer->get_texture(texture);

	if (!at.is_valid()) {
		return Rect2(0, 0, 1, 1);
	}

	Rect2 region = at->get_region();

	Ref<Texture> tex = at->get_atlas();

	if (!tex.is_valid()) {
		return Rect2(0, 0, 1, 1);
	}

	Ref<Image> image = tex->get_data();

	if (!image.is_valid()) {
		return Rect2(0, 0, 1, 1);
	}

	float w = tex->get_width();
	float h = tex->get_height();

	region.position = Size2(region.position.x / w, region.position.y / h);
	region.size = Size2(region.size.x / w, region.size.y / h);

	return region;
}

Ref<TexturePacker> Terrain2DLibraryMergerPCM::get_prop_packer() {
	return _prop_packer;
}
#endif

void Terrain2DLibraryMergerPCM::refresh_rects() {
	bool texture_added = false;
	for (int i = 0; i < _terra_surfaces.size(); i++) {
		Ref<Terrain2DSurfaceMerger> surface = Ref<Terrain2DSurfaceMerger>(_terra_surfaces[i]);

		if (surface.is_valid()) {
			for (int j = 0; j < Terrain2DSurface::TERRAIN_2D_SIDES_COUNT; ++j) {
				Ref<Texture> tex = surface->get_texture(static_cast<Terrain2DSurface::Terrain2DSurfaceSides>(j));

				if (!tex.is_valid())
					continue;

				if (!_packer->contains_texture(tex)) {
					texture_added = true;
					surface->set_region(static_cast<Terrain2DSurface::Terrain2DSurfaceSides>(j), _packer->add_texture(tex));
				} else {
					surface->set_region(static_cast<Terrain2DSurface::Terrain2DSurfaceSides>(j), _packer->get_texture(tex));
				}
			}
		}
	}

	if (texture_added) {
		_packer->merge();

		ERR_FAIL_COND(_packer->get_texture_count() == 0);

		Ref<Texture> tex = _packer->get_generated_texture(0);

		setup_material_albedo(MATERIAL_INDEX_TERRAIN, tex);
		setup_material_albedo(MATERIAL_INDEX_LIQUID, tex);
	}

#ifdef PROPS_2D_PRESENT
	//todo add this back
	//texture_added = false;
	for (int i = 0; i < _props.size(); i++) {
		Ref<Prop2DData> prop = _props.get(i);

		if (prop.is_valid()) {
			if (process_prop_textures(prop))
				texture_added = true;
		}
	}

	//if (texture_added) {
	if (_prop_packer->get_texture_count() > 0) {
		_prop_packer->merge();

		//ERR_FAIL_COND(_prop_packer->get_texture_count() == 0);

		Ref<Texture> tex = _prop_packer->get_generated_texture(0);

		setup_material_albedo(MATERIAL_INDEX_PROP, tex);
	}
#endif

	for (int i = 0; i < _terra_surfaces.size(); i++) {
		Ref<Terrain2DSurfaceMerger> surface = _terra_surfaces[i];

		if (surface.is_valid()) {
			surface->refresh_rects();
		}
	}

	set_initialized(true);
}

void Terrain2DLibraryMergerPCM::_setup_material_albedo(const int material_index, const Ref<Texture> &texture) {
	Ref<ShaderMaterial> shmat;

	switch (material_index) {
		case MATERIAL_INDEX_TERRAIN:
			shmat = material_get();
			break;
		case MATERIAL_INDEX_LIQUID:
			shmat = liquid_material_get();
			break;
		case MATERIAL_INDEX_PROP:
			shmat = prop_material_get();
			break;
	}

	if (shmat.is_valid()) {
		shmat->set_shader_param("texture_albedo", texture);
	}
}

Terrain2DLibraryMergerPCM::Terrain2DLibraryMergerPCM() {
	_packer.instance();

#if GODOT4
#warning implement
#else
	_packer->set_texture_flags(Texture::FLAG_MIPMAPS | Texture::FLAG_FILTER);
#endif

	_packer->set_max_atlas_size(1024);
	_packer->set_keep_original_atlases(false);
	_packer->set_margin(0);

	_prop_packer.instance();

#if GODOT4
#warning implement
#else
	_prop_packer->set_texture_flags(Texture::FLAG_MIPMAPS | Texture::FLAG_FILTER);
#endif

	_prop_packer->set_max_atlas_size(1024);
	_prop_packer->set_keep_original_atlases(false);
	_prop_packer->set_margin(0);
}

Terrain2DLibraryMergerPCM::~Terrain2DLibraryMergerPCM() {
	for (int i = 0; i < _terra_surfaces.size(); ++i) {
		Ref<Terrain2DSurface> surface = _terra_surfaces[i];

		if (surface.is_valid()) {
			surface->set_library(Ref<Terrain2DLibraryMergerPCM>());
		}
	}

	_terra_surfaces.clear();

	_packer->clear();
	_packer.unref();

	_prop_packer->clear();
	_prop_packer.unref();
}

#ifdef PROPS_2D_PRESENT
bool Terrain2DLibraryMergerPCM::process_prop_textures(Ref<Prop2DData> prop) {
	if (!prop.is_valid()) {
		return false;
	}

	bool texture_added = false;

	for (int i = 0; i < prop->get_prop_count(); ++i) {
		Ref<Prop2DDataMeshData> pdm = prop->get_prop(i);

		if (pdm.is_valid()) {
			Ref<Texture> tex = pdm->get_texture();

			if (!tex.is_valid())
				continue;

			if (!_prop_packer->contains_texture(tex)) {
				_prop_packer->add_texture(tex);
				texture_added = true;
			}
		}

		Ref<Prop2DDataProp2D> pdp = prop->get_prop(i);

		if (pdp.is_valid()) {
			if (process_prop_textures(pdp))
				texture_added = true;
		}
	}

	return texture_added;
}
#endif

void Terrain2DLibraryMergerPCM::_bind_methods() {
	ClassDB::bind_method(D_METHOD("get_texture_flags"), &Terrain2DLibraryMergerPCM::get_texture_flags);
	ClassDB::bind_method(D_METHOD("set_texture_flags", "flags"), &Terrain2DLibraryMergerPCM::set_texture_flags);
	ADD_PROPERTY(PropertyInfo(Variant::INT, "texture_flags", PROPERTY_HINT_FLAGS, "Mipmaps,Repeat,Filter,Anisotropic Linear,Convert to Linear,Mirrored Repeat,Video Surface"), "set_texture_flags", "get_texture_flags");

	ClassDB::bind_method(D_METHOD("get_max_atlas_size"), &Terrain2DLibraryMergerPCM::get_max_atlas_size);
	ClassDB::bind_method(D_METHOD("set_max_atlas_size", "size"), &Terrain2DLibraryMergerPCM::set_max_atlas_size);
	ADD_PROPERTY(PropertyInfo(Variant::INT, "max_atlas_size"), "set_max_atlas_size", "get_max_atlas_size");

	ClassDB::bind_method(D_METHOD("get_keep_original_atlases"), &Terrain2DLibraryMergerPCM::get_keep_original_atlases);
	ClassDB::bind_method(D_METHOD("set_keep_original_atlases", "value"), &Terrain2DLibraryMergerPCM::set_keep_original_atlases);
	ADD_PROPERTY(PropertyInfo(Variant::BOOL, "keep_original_atlases"), "set_keep_original_atlases", "get_keep_original_atlases");

	ClassDB::bind_method(D_METHOD("get_background_color"), &Terrain2DLibraryMergerPCM::get_background_color);
	ClassDB::bind_method(D_METHOD("set_background_color", "color"), &Terrain2DLibraryMergerPCM::set_background_color);
	ADD_PROPERTY(PropertyInfo(Variant::COLOR, "background_color"), "set_background_color", "get_background_color");

	ClassDB::bind_method(D_METHOD("get_margin"), &Terrain2DLibraryMergerPCM::get_margin);
	ClassDB::bind_method(D_METHOD("set_margin", "size"), &Terrain2DLibraryMergerPCM::set_margin);
	ADD_PROPERTY(PropertyInfo(Variant::INT, "margin"), "set_margin", "get_margin");

	ClassDB::bind_method(D_METHOD("get_terra_surfaces"), &Terrain2DLibraryMergerPCM::get_terra_surfaces);
	ClassDB::bind_method(D_METHOD("set_terra_surfaces"), &Terrain2DLibraryMergerPCM::set_terra_surfaces);
	ADD_PROPERTY(PropertyInfo(Variant::ARRAY, "terra_surfaces", PROPERTY_HINT_NONE, "17/17:Terrain2DSurfaceMerger", PROPERTY_USAGE_DEFAULT, "Terrain2DSurfaceMerger"), "set_terra_surfaces", "get_terra_surfaces");

#ifdef PROPS_2D_PRESENT
	ClassDB::bind_method(D_METHOD("get_props"), &Terrain2DLibraryMergerPCM::get_props);
	ClassDB::bind_method(D_METHOD("set_props"), &Terrain2DLibraryMergerPCM::set_props);
	ADD_PROPERTY(PropertyInfo(Variant::ARRAY, "props", PROPERTY_HINT_NONE, "17/17:Prop2DData", PROPERTY_USAGE_DEFAULT, "Prop2DData"), "set_props", "get_props");

	ClassDB::bind_method(D_METHOD("get_prop_uv_rect", "texture"), &Terrain2DLibraryMergerPCM::get_prop_uv_rect);

	ClassDB::bind_method(D_METHOD("get_prop_packer"), &Terrain2DLibraryMergerPCM::get_prop_packer);
#endif

	ClassDB::bind_method(D_METHOD("_setup_material_albedo", "material_index", "texture"), &Terrain2DLibraryMergerPCM::_setup_material_albedo);
}