From 42a0fbbf4420d4c25e813526e026a39130d133ec Mon Sep 17 00:00:00 2001
From: Lurs <2795933+Lurs@users.noreply.github.com>
Date: Tue, 24 Mar 2026 11:19:58 +0100
Subject: [PATCH] Add toggle for water projection offset. Potentially fixes #77

---
 extern/aurora                    |  2 +-
 src/d/d_kankyo.cpp               | 10 +++++++++-
 src/dusk/imgui/ImGuiConsole.hpp  |  1 +
 src/dusk/imgui/ImGuiMenuGame.cpp |  5 +++++
 src/dusk/imgui/ImGuiMenuGame.hpp |  2 ++
 5 files changed, 18 insertions(+), 2 deletions(-)

diff --git a/extern/aurora b/extern/aurora
index 156f9a65e3..d76b70fc72 160000
--- a/extern/aurora
+++ b/extern/aurora
@@ -1 +1 @@
-Subproject commit 156f9a65e38db18a8fc93b30271703e58fa339f5
+Subproject commit d76b70fc72c6a5904a9e78c0526353f8b8e93c61
diff --git a/src/d/d_kankyo.cpp b/src/d/d_kankyo.cpp
index a74ca3c9db..e6d076c05f 100644
--- a/src/d/d_kankyo.cpp
+++ b/src/d/d_kankyo.cpp
@@ -31,6 +31,9 @@
 #include "JSystem/JKernel/JKRSolidHeap.h"
 #include <cstdlib>
 #include <cstring>
+#if TARGET_PC
+#include "dusk/imgui/ImGuiConsole.hpp"
+#endif
 
 static void GxXFog_set();
 
@@ -11376,7 +11379,12 @@ void dKy_bg_MAxx_proc(void* bg_model_p) {
                             Mtx sp1D8;
                             if (mat_name[6] == '2') {
                                 C_MTXLightPerspective(sp1D8, dComIfGd_getView()->fovy,
-                                                      camera_p->view.aspect, 1.0f, 1.0f, -0.01f, 0.0f);
+                                                      camera_p->view.aspect, 1.0f, 1.0f,
+#if TARGET_PC
+                                                      dusk::g_imguiConsole.isWaterProjectionOffsetEnabled() ? -0.01f : 0.0f, 0.0f);
+#else
+                                                      -0.01f, 0.0f);
+#endif
                             } else {
                                 C_MTXLightPerspective(sp1D8, dComIfGd_getView()->fovy,
                                                       camera_p->view.aspect, 0.49f, -0.49f, 0.5f, 0.5f);
diff --git a/src/dusk/imgui/ImGuiConsole.hpp b/src/dusk/imgui/ImGuiConsole.hpp
index 47fa435626..9f7c497288 100644
--- a/src/dusk/imgui/ImGuiConsole.hpp
+++ b/src/dusk/imgui/ImGuiConsole.hpp
@@ -15,6 +15,7 @@ namespace dusk {
 		void draw();
 
         bool isBloomEnabled() { return m_menuGame.isBloomEnabled(); }
+        bool isWaterProjectionOffsetEnabled() { return m_menuGame.isWaterProjectionOffsetEnabled(); }
 		ImGuiMenuTools::CollisionViewSettings& getCollisionViewSettings() { return m_menuTools.getCollisionViewSettings(); }
 
 		static bool CheckMenuViewToggle(ImGuiKey key, bool& active);
diff --git a/src/dusk/imgui/ImGuiMenuGame.cpp b/src/dusk/imgui/ImGuiMenuGame.cpp
index 3d9af4fdc5..b393005e98 100644
--- a/src/dusk/imgui/ImGuiMenuGame.cpp
+++ b/src/dusk/imgui/ImGuiMenuGame.cpp
@@ -23,6 +23,11 @@ namespace dusk {
 
             if (ImGui::BeginMenu("Graphics")) {
                 ImGui::Checkbox("Native Bloom", &m_graphicsSettings.m_enableBloom);
+                ImGui::Checkbox("Water Projection Offset", &m_graphicsSettings.m_waterProjectionOffset);
+                if (ImGui::IsItemHovered()) {
+                    ImGui::SetTooltip("Adds GC-specific -0.01 transS offset\n"
+                                      "that causes ~6px ghost artifacts in water reflections");
+                }
                 ImGui::EndMenu();
             }
 
diff --git a/src/dusk/imgui/ImGuiMenuGame.hpp b/src/dusk/imgui/ImGuiMenuGame.hpp
index a76a20f7c4..35e7e397aa 100644
--- a/src/dusk/imgui/ImGuiMenuGame.hpp
+++ b/src/dusk/imgui/ImGuiMenuGame.hpp
@@ -13,6 +13,7 @@ namespace dusk {
         ImGuiMenuGame();
         void draw();
         bool isBloomEnabled() { return m_graphicsSettings.m_enableBloom; }
+        bool isWaterProjectionOffsetEnabled() { return m_graphicsSettings.m_waterProjectionOffset; }
 
         void windowInputViewer();
         void windowControllerConfig();
@@ -35,6 +36,7 @@ namespace dusk {
 
         struct {
             bool m_enableBloom = 1;
+            bool m_waterProjectionOffset = false;
         } m_graphicsSettings;
 
         bool m_showControllerConfig = false;