Add "follow killer" switch for spectate mode

docs/CHANGELOG.md

@@ -61,6 +61,7 @@ Version 1.9.0 (not released yet)
 - Add `version` command
 - Support autocompleting of level filenames and console commands from only 1 character
 - Add support for `bluebeard.bty` (sound config file) in mods
+- Add `spectate_mode_follow_killer` command (when player you are spectating dies, spectate their killer)
 - Remove level editor popups that stop user from navigating between modes until rebuilding
 
 [@is-this-c](https://github.com/is-this-c)

game_patch/hud/multi_spectate.cpp

@@ -24,6 +24,7 @@ static rf::Player* g_spectate_mode_target;
 static rf::Camera* g_old_target_camera = nullptr;
 static bool g_spectate_mode_enabled = false;
 static bool g_spawned_in_current_level = false;
+static bool g_spectate_mode_follow_killer = false;
 
 void player_fpgun_set_player(rf::Player* pp);
 
@@ -203,6 +204,18 @@ bool multi_spectate_execute_action(rf::ControlConfigAction action, bool was_pres
     return false;
 }
 
+void multi_spectate_on_player_kill(rf::Player* victim, rf::Player* killer)
+{
+    if (!g_spectate_mode_enabled) {
+        return;
+    }
+    if (g_spectate_mode_follow_killer && g_spectate_mode_target == victim && killer != rf::local_player) {
+        // spectate killer if we were spectating victim
+        // avoid spectating ourselves if we somehow managed to kill the victim
+        multi_spectate_set_target_player(killer);
+    }
+}
+
 void multi_spectate_on_destroy_player(rf::Player* player)
 {
     if (player != rf::local_player) {
@@ -272,6 +285,15 @@ static ConsoleCommand2 spectate_mode_minimal_ui_cmd{
     "Toggles spectate mode minimal UI",
 };
 
+static ConsoleCommand2 spectate_mode_follow_killer_cmd{
+    "spectate_mode_follow_killer",
+    []() {
+        g_spectate_mode_follow_killer = !g_spectate_mode_follow_killer;
+        rf::console::printf("Follow killer mode is %s", g_spectate_mode_follow_killer ? "enabled" : "disabled");
+    },
+    "When a player you're spectating dies, automatically spectate their killer",
+};
+
 #if SPECTATE_MODE_SHOW_WEAPON
 
 static void player_render_new(rf::Player* player)
@@ -322,6 +344,7 @@ void multi_spectate_appy_patch()
 
     spectate_cmd.register_cmd();
     spectate_mode_minimal_ui_cmd.register_cmd();
+    spectate_mode_follow_killer_cmd.register_cmd();
 
     // Note: HUD rendering doesn't make sense because life and armor isn't synced
 

game_patch/hud/multi_spectate.h

@@ -14,6 +14,7 @@ void multi_spectate_appy_patch();
 void multi_spectate_after_full_game_init();
 void multi_spectate_level_init();
 void multi_spectate_render();
+void multi_spectate_on_player_kill(rf::Player* player, rf::Player* killer);
 void multi_spectate_on_destroy_player(rf::Player* player);
 void multi_spectate_player_create_entity_post(rf::Player* player, rf::Entity* entity);
 bool multi_spectate_is_spectating();

game_patch/multi/kill.cpp

@@ -9,6 +9,7 @@
 #include "../rf/localize.h"
 #include "../rf/multi.h"
 #include "../rf/weapon.h"
+#include "../hud/multi_spectate.h"
 #include "server_internal.h"
 
 bool kill_messages = true;
@@ -148,6 +149,8 @@ void on_player_kill(rf::Player* killed_player, rf::Player* killer_player)
         }
 
         multi_apply_kill_reward(killer_player);
+
+        multi_spectate_on_player_kill(killed_player, killer_player);
     }
 }