From f75a170ec04d4cdd8dcda0bb9c4616954f75e2e5 Mon Sep 17 00:00:00 2001
From: ragnarok-clanker <ragnarok-clanker>
Date: Fri, 30 Oct 2026 00:39:25 +0000
Subject: [PATCH] Decompile 4 functions in
 Source/Contents/Effects/EZ2STREffectEx.cpp,
 Source/Contents/Effects/EZ2STREffectEx.h

Batch #4035 by kyoshi: 2 byte-identical, 2 confirmed by peer review.

- fn_06962 CEZ2STREffectEx::CEZ2STREffectEx: logic confirmed by peer review
- fn_06964 CEZ2STREffectEx::Close: byte-identical
- fn_06965 CEZ2STREffectEx::Slot31: byte-identical
- fn_06966 ScreenAngle: logic confirmed by peer review

Peer-reviewed-by: youko, tayoba
Accepted without human review: peers confirmed the logic ("same" ahead by at least 3, with 70% of the votes).
Adds to the build: Source/Contents/Effects/EZ2STREffectEx.cpp
---
 Source/Contents/Effects/EZ2STREffectEx.cpp | 54 ++++++++++++++++++++++
 Source/Contents/Effects/EZ2STREffectEx.h   | 29 ++++++++++++
 data/compile.json                          |  1 +
 3 files changed, 84 insertions(+)
 create mode 100644 Source/Contents/Effects/EZ2STREffectEx.cpp
 create mode 100644 Source/Contents/Effects/EZ2STREffectEx.h

diff --git a/Source/Contents/Effects/EZ2STREffectEx.cpp b/Source/Contents/Effects/EZ2STREffectEx.cpp
new file mode 100644
index 00000000..276d4e60
--- /dev/null
+++ b/Source/Contents/Effects/EZ2STREffectEx.cpp
@@ -0,0 +1,54 @@
+#include "Contents/Effects/EZ2STREffectEx.h"
+
+#include "Contents/Effects/EffectMemoryMgr.h"
+#include "Render/Renderer.h"
+#include "Utility/Math/AffineMatrix.h"
+
+#include <cmath>
+
+// OFFSET: 0x006FF480
+// FUNCTION: fn_06962
+CEZ2STREffectEx::CEZ2STREffectEx() : CEffect(-1), particle(nullptr), finished(0), unknown_00D4(0), unknown_00D8(0) {
+}
+
+// OFFSET: 0x006FF740
+// FUNCTION: fn_06964
+void CEZ2STREffectEx::Close() {
+  if (this->particle) {
+    FreeParticle(this->particle);
+    this->particle = nullptr;
+  }
+}
+
+// OFFSET: 0x006FF770
+// FUNCTION: fn_06965
+void CEZ2STREffectEx::Slot31() {
+  this->finished = 1;
+}
+
+// OFFSET: 0x006FF780
+// FUNCTION: fn_06966
+float ScreenAngle(const float* from, const float* to, const float* matrix) {
+  float fromX;
+  float fromY;
+  float fromDepth = 0.0f;
+  float toX;
+  float toY;
+  float toDepth = 0.0f;
+  g_renderer->ProjectViewport(from, matrix, &fromX, &fromY, &fromDepth);
+  g_renderer->ProjectViewport(to, matrix, &toX, &toY, &toDepth);
+
+  const float dx = toX - fromX;
+  const float dy = toY - fromY;
+  const float length = SquareRoot(dy * dy + dx * dx);
+  if (length == 0.0f) {
+    return 0.0f;
+  }
+
+  const float angle = static_cast<float>(std::acos(static_cast<double>(dx / length))) / 3.141592f * 180.0f;
+  if (fromY > toY) {
+    return 360.0f - angle;
+  }
+
+  return angle;
+}
diff --git a/Source/Contents/Effects/EZ2STREffectEx.h b/Source/Contents/Effects/EZ2STREffectEx.h
new file mode 100644
index 00000000..5fbeb13a
--- /dev/null
+++ b/Source/Contents/Effects/EZ2STREffectEx.h
@@ -0,0 +1,29 @@
+#ifndef RAGNAROK_SOURCE_CONTENTS_EFFECTS_EZ2STREFFECTEX_H
+#define RAGNAROK_SOURCE_CONTENTS_EFFECTS_EZ2STREFFECTEX_H
+
+#include "Contents/Effects/Effect.h"
+
+#include <cstddef>
+
+class CParticle;
+
+class CEZ2STREffectEx : public CEffect {
+public:
+  CEZ2STREffectEx();
+  void Close() override;
+  void Slot31() override;
+
+  /* 00CC */ CParticle* particle;
+  /* 00D0 */ unsigned char finished;
+  /* 00D4 */ int unknown_00D4;
+  /* 00D8 */ unsigned char unknown_00D8;
+};
+
+float ScreenAngle(const float* from, const float* to, const float* matrix);
+
+#if defined(_WIN32) && !defined(_WIN64)
+static_assert(offsetof(CEZ2STREffectEx, particle) == 0xCC);
+static_assert(offsetof(CEZ2STREffectEx, unknown_00D8) == 0xD8);
+#endif
+
+#endif
diff --git a/data/compile.json b/data/compile.json
index a1c1ad2d..93aed984 100644
--- a/data/compile.json
+++ b/data/compile.json
@@ -336,6 +336,7 @@
   "Source/Contents/Effects/CommonFloorEffect.cpp": 4,
   "Source/Contents/Effects/Competentia.cpp": 4,
   "Source/Contents/Effects/CresciveBolt.cpp": 4,
+  "Source/Contents/Effects/EZ2STREffectEx.cpp": 4,
   "Source/Contents/Effects/Effect.cpp": 0,
   "Source/Contents/Effects/EffectActor.cpp": 4,
   "Source/Contents/Effects/EffectAttachments.cpp": 4,