tr2/camera: determine room for in-game cutscenes

Standalone cutscene levels already determine the room for cinematic
positions, but in-game cutscenes do not and hence camera interpolation
clamping can yield bad results for wide ranging cinematics. This
ensures the camera is always in the correct room for in-game cutscenes.

Resolves #2754.

docs/tr2/CHANGELOG.md

@@ -24,6 +24,7 @@
 - fixed the drawbridge producing dynamic light when open (#2294)
 - fixed the scale of several pickup models in The Golden Mask (#2652)
 - fixed the shark in The Cold War not making any sounds when biting Lara (#2678)
+- fixed the in-game cinematic camera at times yielding invalid positions (and hence views) in custom levels (#2754)
 - fixed sprites rendering black if no shade value is assigned in the level (#2701, regression from 0.8)
 - fixed a crash if an image was missing
 - fixed a crash on level load if an animation has no frames (#2746, regression from 0.8)

src/tr2/game/camera.c

@@ -877,6 +877,12 @@ void Camera_LoadCutsceneFrame(void)
     g_Camera.roll = roll;
     g_Camera.shift = 0;
 
+    const int16_t room_num =
+        Room_FindByPos(g_Camera.pos.x, g_Camera.pos.y, g_Camera.pos.z);
+    if (room_num != NO_ROOM_NEG) {
+        g_Camera.pos.room_num = room_num;
+    }
+
     Viewport_AlterFOV(fov);
 
     if (g_Config.audio.enable_lara_mic) {