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Make internal unique scene resource ID deterministic

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Changes the Resource::generate_scene_unique_id() to be deterministic and
seedable.

Fixes #97110
This commit is contained in:
Juan 2024-09-23 15:07:00 +02:00
parent d5aadc38b4
commit abf9d24520
4 changed files with 27 additions and 11 deletions
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33
core/io/resource.cpp
View file

@ -99,31 +99,42 @@ void Resource::set_path_cache(const String &p_path) {
GDVIRTUAL_CALL(_set_path_cache, p_path);
}
static thread_local RandomPCG unique_id_gen(0, RandomPCG::DEFAULT_INC);
void Resource::seed_scene_unique_id(uint32_t p_seed) {
unique_id_gen.seed(p_seed);
}
String Resource::generate_scene_unique_id() {
// Generate a unique enough hash, but still user-readable.
// If it's not unique it does not matter because the saver will try again.
OS::DateTime dt = OS::get_singleton()->get_datetime();
uint32_t hash = hash_murmur3_one_32(OS::get_singleton()->get_ticks_usec());
hash = hash_murmur3_one_32(dt.year, hash);
hash = hash_murmur3_one_32(dt.month, hash);
hash = hash_murmur3_one_32(dt.day, hash);
hash = hash_murmur3_one_32(dt.hour, hash);
hash = hash_murmur3_one_32(dt.minute, hash);
hash = hash_murmur3_one_32(dt.second, hash);
hash = hash_murmur3_one_32(Math::rand(), hash);
if (unique_id_gen.get_seed() == 0) {
OS::DateTime dt = OS::get_singleton()->get_datetime();
uint32_t hash = hash_murmur3_one_32(OS::get_singleton()->get_ticks_usec());
hash = hash_murmur3_one_32(dt.year, hash);
hash = hash_murmur3_one_32(dt.month, hash);
hash = hash_murmur3_one_32(dt.day, hash);
hash = hash_murmur3_one_32(dt.hour, hash);
hash = hash_murmur3_one_32(dt.minute, hash);
hash = hash_murmur3_one_32(dt.second, hash);
hash = hash_murmur3_one_32(Math::rand(), hash);
unique_id_gen.seed(hash);
}
uint32_t random_num = unique_id_gen.rand();
static constexpr uint32_t characters = 5;
static constexpr uint32_t char_count = ('z' - 'a');
static constexpr uint32_t base = char_count + ('9' - '0');
String id;
for (uint32_t i = 0; i < characters; i++) {
uint32_t c = hash % base;
uint32_t c = random_num % base;
if (c < char_count) {
id += String::chr('a' + c);
} else {
id += String::chr('0' + (c - char_count));
}
hash /= base;
random_num /= base;
}
return id;

1
core/io/resource.h
View file

@ -114,6 +114,7 @@ public:
virtual void set_path_cache(const String &p_path); // Set raw path without involving resource cache.
_FORCE_INLINE_ bool is_built_in() const { return path_cache.is_empty() || path_cache.contains("::") || path_cache.begins_with("local://"); }
static void seed_scene_unique_id(uint32_t p_seed);
static String generate_scene_unique_id();
void set_scene_unique_id(const String &p_id);
String get_scene_unique_id() const;

2
core/io/resource_format_binary.cpp
View file

@ -2136,6 +2136,8 @@ static String _resource_get_class(Ref<Resource> p_resource) {
}
Error ResourceFormatSaverBinaryInstance::save(const String &p_path, const Ref<Resource> &p_resource, uint32_t p_flags) {
Resource::seed_scene_unique_id(p_path.hash());
Error err;
Ref<FileAccess> f;
if (p_flags & ResourceSaver::FLAG_COMPRESS) {

2
scene/resources/resource_format_text.cpp
View file

@ -1708,6 +1708,8 @@ static String _resource_get_class(Ref<Resource> p_resource) {
}
Error ResourceFormatSaverTextInstance::save(const String &p_path, const Ref<Resource> &p_resource, uint32_t p_flags) {
Resource::seed_scene_unique_id(p_path.hash()); // Seeding for save path should make it deterministic for importers.
if (p_path.ends_with(".tscn")) {
packed_scene = p_resource;
}