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+# Odin
+
+This document contains specifics about the workings of the Odin programming
+language, dynamic linking and state management design patterns. These are
+tested and validated findings, for continued reference by me.
+
+## Dynamic Library Memory
+
+When a program loads in a dynamic library, what happens with package globals?
+
+Findings (macOS):
+- Package globals are shared between modules, but only indirectly
+  - This is due to the dynamic linker merging symbols into a (single) flat namespace
+  - Practically this means the lib's unset package globals get shadowed by the hosts'
+- After hot reloading the lib, the memory of the packge is not refreshed,
+  it keeps pointing to the package global of the host
+
+Findings (Windows):
+- Package globals are not shared between modules, they have their own copy
+
+Findings (Linux):
+- Package globals are not shared between modules, they have their own copy
+
+Conclusion: avoid package globals, or pass pointers to the dynamic library so
+it can match its package globals with the host module.
+
+## Dependency Patterns
+
+1. Strict layering, only call downwards. If two modules need each other, one of
+   the modules is in a wrong layer. Move it, or extract the shared part into a
+   lower layer.
+2. Dependency inversion: if required, define an interface in the lower layer,
+   upper layer registers itself.
+3. Dependency Injection: Prevent dependencies via data, over includes. Pass what
+   a function needs as arguments instead of reaching another module's state.
+4. Events instead of callbacks both ways If A and B would call each other,
+   have A push events into a queue and B consume them. Neither module includes
+   the other; they only share the event type (which lives in a lower layer).
+5. Merge or split as a last resort, if two modules genuinely can't be untangled.
+
+Sindri Engine:
+
+```
++---------------------+                                       Game:
+|        Game         |                                       - Game
++---------------------+
+          |
+          v
++---------------------+          +---------------------+      Core:
+|        Core         |<----+----|        main         |      - Input
++---------------------+     |    +---------------------+
+          |                 |
+          v                 |
++---------------------+     |                                 Platform:
+|      Platform       |<----+                                 - GLFW
++---------------------+     |                                 - wgpu
+          |                 |
+          v                 |
++---------------------+     |                                 Base:
+|        Base         |<----+                                 - Hot Reload
++---------------------+                                       - Settings
+                                                              - Event
+                                                              - Keycodes
+```