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Implement Resource UIDs

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* Most resource types now have unique identifiers.
* Applies to text, binary and imported resources.
* File formats reference both by text and UID (when available). UID always has priority.
* Resource UIDs are 64 bits for better compatibility with the engine.
* Can be represented and used textually, example `uuid://dapwmgsmnl28u`.
* A special binary cache file is used and exported, containing the mappings.

Example of how it looks:

```GDScript
[gd_scene load_steps=2 format=3 uid="uid://dw86wq31afig2"]

[ext_resource type="PackedScene" uid="uid://bt36ojelx8q6c" path="res://subscene.scn" id="1_t56hs"]
```

GDScript, shaders and other special resource files can't currently provide UIDs, but this should be doable with special keywords on the files.
This will be reserved for future PRs.
This commit is contained in:
reduz 2021-07-23 16:01:18 -03:00
parent c25fa02c1c
commit 32b43cfeb3
25 changed files with 900 additions and 126 deletions
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2
drivers/unix/file_access_unix.cpp
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@ -111,7 +111,7 @@ Error FileAccessUnix::_open(const String &p_path, int p_mode_flags) {
}
}
if (is_backup_save_enabled() && (p_mode_flags & WRITE) && !(p_mode_flags & READ)) {
if (is_backup_save_enabled() && (p_mode_flags == WRITE)) {
save_path = path;
path = path + ".tmp";
}