Add ObjectSpawn IPC opcode

The struct itself is all kinds of wrong as I blindly copied it from
Sapphire, so I wouldn't depend on it just yet.

resources/opcodes.json

@@ -259,6 +259,11 @@
             "name": "ContentFinderFound2",
             "opcode": 619,
             "size": 812
+        },
+        {
+            "name": "ObjectSpawn",
+            "opcode": 425,
+            "size": 64
         }
     ],
     "ClientZoneIpcType": [

src/ipc/zone/mod.rs

@@ -88,6 +88,9 @@ pub use config::Config;
 mod event_yield_handler;
 pub use event_yield_handler::EventYieldHandler;
 
+mod object_spawn;
+pub use object_spawn::ObjectSpawn;
+
 use crate::COMPLETED_QUEST_BITMASK_SIZE;
 use crate::common::ObjectTypeId;
 use crate::common::Position;
@@ -436,6 +439,8 @@ pub enum ServerZoneIpcData {
     },
     #[br(pre_assert(*magic == ServerZoneIpcType::ContentFinderFound2))]
     ContentFinderFound2 { unk1: [u8; 8] },
+    #[br(pre_assert(*magic == ServerZoneIpcType::ObjectSpawn))]
+    ObjectSpawn(ObjectSpawn),
     Unknown {
         #[br(count = size - 32)]
         unk: Vec<u8>,
@@ -872,6 +877,10 @@ mod tests {
                     unk4: 0,
                 },
             ),
+            (
+                ServerZoneIpcType::ObjectSpawn,
+                ServerZoneIpcData::ObjectSpawn(ObjectSpawn::default()),
+            ),
         ];
 
         for (opcode, data) in &ipc_types {

src/ipc/zone/object_spawn.rs

@@ -0,0 +1,32 @@
+use binrw::binrw;
+
+use crate::common::{Position, read_quantized_rotation, write_quantized_rotation};
+
+// TODO: this is all kinds of wrong, take the fields with a grain of salt
+#[binrw]
+#[brw(little)]
+#[derive(Debug, Clone, Default)]
+pub struct ObjectSpawn {
+    pub index: u8,
+    pub kind: u8,
+    #[brw(pad_after = 1)] // padding, or part of flag?
+    pub flag: u8,
+    pub base_id: u32,
+    pub entity_id: u32,
+    pub layout_id: u32,
+    pub content_id: u32,
+    pub owner_id: u32,
+    pub bind_layout_id: u32,
+    pub scale: f32,
+    pub shared_group_timeline_state: u16,
+    #[br(map = read_quantized_rotation)]
+    #[bw(map = write_quantized_rotation)]
+    pub rotation: f32,
+    pub fate: u16,
+    pub permission_invisibility: u8,
+    pub args1: u8,
+    pub args2: u32,
+    pub args3: u32,
+    pub unk1: u32,
+    pub position: Position,
+}