From 4f3144472ad72e8e4e7526ebbeb9872c98c8f360 Mon Sep 17 00:00:00 2001
From: "Skyth (Asilkan)"
 <19259897+blueskythlikesclouds@users.noreply.github.com>
Date: Thu, 13 Feb 2025 18:25:42 +0300
Subject: [PATCH] Fix model explosion in Temple Entrance cutscene. (#395)

---
 UnleashedRecomp/patches/inspire_patches.cpp | 31 +++++++++++++++++++++
 UnleashedRecompLib/config/SWA.toml          |  5 ++++
 2 files changed, 36 insertions(+)

diff --git a/UnleashedRecomp/patches/inspire_patches.cpp b/UnleashedRecomp/patches/inspire_patches.cpp
index a918936..4e493bc 100644
--- a/UnleashedRecomp/patches/inspire_patches.cpp
+++ b/UnleashedRecomp/patches/inspire_patches.cpp
@@ -32,6 +32,11 @@ static std::unordered_map<std::string_view, std::pair<float, float>> g_evilSonic
     { "evrt_m8_04", { 0, 2314 } }             // Dark Gaia Appears
 };
 
+// Sonic's mouth EXPLODES for a single frame in Temple Entrance cutscene. 
+// Looks very nasty. Let's hide morph models inbetween certain frames to solve it.
+static bool g_loadedMouthExplosionAnimation;
+static bool g_hideMorphModels;
+
 // SWA::Inspire::CScene
 PPC_FUNC_IMPL(__imp__sub_82B98D80);
 PPC_FUNC(sub_82B98D80)
@@ -53,6 +58,9 @@ PPC_FUNC(sub_82B98D30)
     InspirePatches::s_sceneName.clear();
 
     SDL_User_EvilSonic(App::s_isWerehog);
+
+    g_loadedMouthExplosionAnimation = false;
+    g_hideMorphModels = false;
 }
 
 PPC_FUNC_IMPL(__imp__sub_82B9BA98);
@@ -65,6 +73,26 @@ PPC_FUNC(sub_82B9BA98)
     __imp__sub_82B9BA98(ctx, base);
 }
 
+void AnimationDataMakeMidAsmHook(PPCRegister& r31, PPCRegister& r29, PPCRegister& r28)
+{
+    uint8_t* base = g_memory.base;
+
+    if (r28.u32 == 0x222E0 &&
+        strcmp(reinterpret_cast<const char*>(base + PPC_LOAD_U32(r31.u32)), "t0_04_SN") == 0 &&
+        XXH3_64bits(base + r29.u32, r28.u32) == 0xEC634F0F379F478A)
+    {
+        g_loadedMouthExplosionAnimation = true;
+    }
+}
+
+// Hedgehog::Mirage::CSingleMorphElement::Render
+PPC_FUNC_IMPL(__imp__sub_82E32048);
+PPC_FUNC(sub_82E32048)
+{
+    if (!g_hideMorphModels)
+        __imp__sub_82E32048(ctx, base);
+}
+
 void InspirePatches::DrawDebug()
 {
     if (!g_pScene)
@@ -101,6 +129,9 @@ void InspirePatches::Update()
     if (!g_pScene || !InspirePatches::s_sceneName.size())
         return;
 
+    g_hideMorphModels = g_loadedMouthExplosionAnimation && g_pScene->m_pData->Frame >= 185.0f &&
+        g_pScene->m_pData->Frame < 195.0f && InspirePatches::s_sceneName == "evrt_t0_04";
+
     if (!g_isFirstFrameChecked && std::find(g_alwaysEvilSonic.begin(), g_alwaysEvilSonic.end(), InspirePatches::s_sceneName) != g_alwaysEvilSonic.end())
     {
         SDL_User_EvilSonic(true);
diff --git a/UnleashedRecompLib/config/SWA.toml b/UnleashedRecompLib/config/SWA.toml
index 09ccfee..509134d 100644
--- a/UnleashedRecompLib/config/SWA.toml
+++ b/UnleashedRecompLib/config/SWA.toml
@@ -1056,3 +1056,8 @@ registers = ["v62"]
 name = "BossEggDragoonDrillMissileCMissileSetRotationMidAsmHook"
 address = 0x82A9BADC
 registers = ["r4"]
+
+[[midasm_hook]]
+name = "AnimationDataMakeMidAsmHook"
+address = 0x82BB38E4
+registers = ["r31", "r29", "r28"]