Reimplement cut stock game gibbing feature

common/include/common/config/GameConfig.h

@@ -60,6 +60,7 @@ struct GameConfig
     CfgVar<bool> mesh_static_lighting = true;
     CfgVar<bool> glares = true;
     CfgVar<bool> show_enemy_bullets = true;
+    CfgVar<bool> gibbing = false;
 
     static constexpr float min_fov = 75.0f;
     static constexpr float max_fov = 160.0f;

common/src/config/GameConfig.cpp

@@ -171,6 +171,7 @@ bool GameConfig::visit_vars(T&& visitor, bool is_save)
     result &= visitor(dash_faction_key, "Swap Assault Rifle Controls", swap_assault_rifle_controls);
     result &= visitor(dash_faction_key, "Swap Grenade Controls", swap_grenade_controls);
     result &= visitor(dash_faction_key, "Glares", glares);
+    result &= visitor(dash_faction_key, "Gibbing", gibbing);
     result &= visitor(dash_faction_key, "Linear Pitch", linear_pitch);
     result &= visitor(dash_faction_key, "Show Enemy Bullets", show_enemy_bullets);
     result &= visitor(dash_faction_key, "Keep Launcher Open", keep_launcher_open);

docs/CHANGELOG.md

@@ -44,6 +44,7 @@ Version 1.9.0 (not released yet)
 - Add level filename to "Level Initializing" console message
 - Properly handle WM_PAINT in dedicated server, may improve performance (DF bug)
 - Fix crash when `verify_level` command is run without a level being loaded
+- Add gibbing when enemies die from explosives (enable with `toggle_gibs` command)
 
 Version 1.8.0 (released 2022-09-17)
 -----------------------------------

game_patch/misc/player.cpp

@@ -288,6 +288,16 @@ CodeInjection sr_load_player_weapon_anims_injection{
     },
 };
 
+ConsoleCommand2 toggle_gibs_cmd{
+    "toggle_gibs",
+    []() {
+        g_game_config.gibbing = !g_game_config.gibbing;
+        g_game_config.save();
+        rf::console::print("Gibbing is {}.", g_game_config.gibbing ? "enabled" : "disabled");
+    },
+    "Toggle entities and corpses exploding into chunks from explosives",
+};
+
 void player_do_patch()
 {
     // general hooks
@@ -349,4 +359,5 @@ void player_do_patch()
 
     // Commands
     damage_screen_flash_cmd.register_cmd();
+    toggle_gibs_cmd.register_cmd();
 }

game_patch/object/entity.cpp

@@ -5,6 +5,7 @@
 #include <xlog/xlog.h>
 #include "../rf/entity.h"
 #include "../rf/corpse.h"
+#include "../rf/multi.h"
 #include "../rf/weapon.h"
 #include "../rf/player/player.h"
 #include "../rf/particle_emitter.h"
@@ -201,6 +202,79 @@ CodeInjection entity_process_pre_hide_riot_shield_injection{
     },
 };
 
+FunHook<void(int)> entity_blood_throw_gibs_hook{
+    0x0042E3C0, [](int handle) {
+        if (g_game_config.gibbing && !rf::is_multi) {
+            rf::Object* objp = rf::obj_from_handle(handle);
+
+            if (!objp) {
+                return; // invalid object
+            }
+
+            rf::Vector3 pos = objp->pos;
+            rf::GRoom* room = objp->room;
+            int explosion_vclip = 30;
+            int chunk_explosion_vclip = 30;
+            float explosion_vclip_radius = 1.0f;
+            rf::String debris_filename = "df_meatchunks0.V3D";
+
+            int debris_max_lifetime = 7000;
+            float debris_velocity = 8.5f;
+            float damage_scale = 1.0f;
+            rf::String cust_snd_set = "gib bounce";
+
+            if (objp->type == rf::OT_ENTITY) {
+                rf::Entity* ep = static_cast<rf::Entity*>(objp);
+
+                explosion_vclip = (ep->info->explode_vclip_index < 0)
+					? ep->info->explode_vclip_index : explosion_vclip;
+
+                explosion_vclip_radius = (ep->info->explode_vclip_radius > 0.0f)
+					? ep->info->explode_vclip_radius : explosion_vclip_radius;
+
+                debris_filename = (!ep->info->debris_filename.empty())
+					? ep->info->debris_filename : debris_filename;
+            }
+            else if (objp->type = rf::OT_CORPSE) {
+            }
+            else {
+                return;
+            }
+
+            rf::game_do_explosion(
+                explosion_vclip, room, 0, &pos, explosion_vclip_radius, damage_scale, 0);
+
+            rf::debris_spawn_from_object(
+                objp, debris_filename, chunk_explosion_vclip, debris_max_lifetime, debris_velocity, &cust_snd_set);
+        }
+    }
+};
+
+CodeInjection entity_damage_explosive_death_injection{
+    0x0041A413,
+    [](auto& regs) {        
+        rf::Entity* ep = regs.esi;
+        if (g_game_config.gibbing && !rf::is_multi && ep) {
+            int damage_type = regs.ebp;
+            ep->ai.explosive_last_damage = (damage_type == 3);
+            if (ep->ai.explosive_last_damage && ep->info->body_temp >= 90.0f) {
+                ep->death_anim_index = -1;
+            }
+        }
+    }
+};
+
+CodeInjection entity_dying_frame_explode_injection{
+    0x0041EE4C,
+    [](auto& regs) {
+        rf::Entity* ep = regs.esi;
+        if (g_game_config.gibbing && !rf::is_multi && ep && ep->ai.explosive_last_damage &&
+			ep->info->body_temp >= 90.0f) {
+            regs.eip = 0x0041EE55;
+        }
+    },
+};
+
 void entity_do_patch()
 {
     // Fix player being stuck to ground when jumping, especially when FPS is greater than 200
@@ -252,4 +326,9 @@ void entity_do_patch()
 
     // Hide riot shield third person model if entity is hidden (e.g. in cutscenes)
     entity_process_pre_hide_riot_shield_injection.install();
+
+	// Restore cut stock game feature for entities and corpses exploding into chunks
+	entity_blood_throw_gibs_hook.install();
+    entity_damage_explosive_death_injection.install();
+    entity_dying_frame_explode_injection.install();
 }

game_patch/rf/ai.h

@@ -212,6 +212,9 @@ namespace rf
         float movement_radius;
         float movement_height;
         bool use_custom_attack_range;
+#ifdef DASH_FACTION
+        bool explosive_last_damage;
+#endif
         float custom_attack_range;
         int ai_flags;
     };

game_patch/rf/entity.h

@@ -425,6 +425,9 @@ namespace rf
     static auto& entity_turn_weapon_on = addr_as_ref<void __cdecl(int entity_handle, int weapon_type, bool alt_fire)>(0x0041A870);
     static auto& entity_turn_weapon_off = addr_as_ref<void __cdecl(int entity_handle, int weapon_type)>(0x0041AE70);
     static auto& entity_restore_mesh = addr_as_ref<void(Entity *ep, const char *mesh_name)>(0x0042C570);
+    static auto entity_blood_throw_gibs = addr_as_ref<void(int)>(0x0042E3C0);
+    static auto& game_do_explosion = addr_as_ref<void(int vclip, rf::GRoom* src_room, rf::Vector3* src_pos,
+        Vector3* pos, float radius, float damage_scale, rf::Vector3* dir)>(0x00436490);
 
     static auto& entity_list = addr_as_ref<Entity>(0x005CB060);
     static auto& local_player_entity = addr_as_ref<Entity*>(0x005CB054);

game_patch/rf/object.h

@@ -134,6 +134,9 @@ namespace rf
     static auto& obj_light_calculate = addr_as_ref<void()>(0x0048B0E0);
 
     static auto& object_list = addr_as_ref<Object>(0x0073D880);
+
+    static auto& debris_spawn_from_object = addr_as_ref<void __cdecl(rf::Object* objp, const char* debris_v3d_filename,
+        int explode_index, int max_lifetime_ms, float velocity, rf::String* cust_snd_set)>(0x004133C0);
 }
 
 template<>

resources/CMakeLists.txt

@@ -44,6 +44,7 @@ add_packfile(dashfaction.vpp
     images/bullet_icon_powercell_1.tga
     images/bullet_icon_rocket_1.tga
     images/bullet_icon_shotgun_1.tga
+    images/df_gore1.tga
     images/enviro0_1.tga
     images/enviro10_1.tga
     images/enviro20_1.tga
@@ -87,6 +88,7 @@ add_packfile(dashfaction.vpp
     meshes/Vat1.v3m
     meshes/coffeesmokedtbl2.v3m
     meshes/coffeesmokedtblAlt.v3m
+    meshes/df_meatchunks0.v3m
 
     standard_vs:${CMAKE_BINARY_DIR}/shaders/standard_vs.bin
     character_vs:${CMAKE_BINARY_DIR}/shaders/character_vs.bin