From bda30a003b07bfc179f906e9cbd0fd0e9946bbbb Mon Sep 17 00:00:00 2001
From: Henrique Gemignani Passos Lima <henrique@gemignani.org>
Date: Mon, 17 Oct 2022 01:32:15 +0300
Subject: [PATCH] Add CRipple::CRipple

---
 include/MetroidPrime/CFluidPlane.hpp |  2 ++
 include/MetroidPrime/CRipple.hpp     | 28 ++++++++++++++++++
 src/MetroidPrime/CRipple.cpp         | 44 ++++++++++++++++++++++++++++
 3 files changed, 74 insertions(+)
 create mode 100644 include/MetroidPrime/CRipple.hpp
 create mode 100644 src/MetroidPrime/CRipple.cpp

diff --git a/include/MetroidPrime/CFluidPlane.hpp b/include/MetroidPrime/CFluidPlane.hpp
index 93d39757..734ac44a 100644
--- a/include/MetroidPrime/CFluidPlane.hpp
+++ b/include/MetroidPrime/CFluidPlane.hpp
@@ -8,6 +8,8 @@
 class CScriptWater;
 class CStateManager;
 
+extern "C" uint sub_8012f098();
+
 class CFluidPlaneCPURender {
 public:
   struct SPatchInfo {};
diff --git a/include/MetroidPrime/CRipple.hpp b/include/MetroidPrime/CRipple.hpp
new file mode 100644
index 00000000..82cba493
--- /dev/null
+++ b/include/MetroidPrime/CRipple.hpp
@@ -0,0 +1,28 @@
+#ifndef _CRIPPLE
+#define _CRIPPLE
+
+#include "MetroidPrime/TGameTypes.hpp"
+
+#include "Kyoto/Math/CVector3f.hpp"
+
+class CRipple {
+  TUniqueId x0_id;
+  float x4_time;
+  CVector3f x8_center;
+  float x14_timeFalloff;
+  float x18_distFalloff;
+  float x1c_frequency;
+  float x20_amplitude;
+  float x24_lookupAmplitude;
+  float x28_ooTimeFalloff;
+  float x2c_ooDistFalloff;
+  float x30_ooPhase;
+  float x34_phase;
+  float x38_lookupPhase;
+  uint x3c_;
+
+public:
+  CRipple(TUniqueId id, const CVector3f& center, float intensity);
+};
+
+#endif // _CRIPPLE
diff --git a/src/MetroidPrime/CRipple.cpp b/src/MetroidPrime/CRipple.cpp
new file mode 100644
index 00000000..70ce7f10
--- /dev/null
+++ b/src/MetroidPrime/CRipple.cpp
@@ -0,0 +1,44 @@
+#include "MetroidPrime/CRipple.hpp"
+
+#include "MetroidPrime/CFluidPlane.hpp"
+
+#include "Kyoto/CRandom16.hpp"
+#include "Kyoto/Math/CMath.hpp"
+
+#include "rstl/math.hpp"
+
+CRipple::CRipple(TUniqueId id, const CVector3f& center, float intensity)
+  : x0_id(id)
+  , x4_time(0.f)
+  , x8_center(center)
+  , x14_timeFalloff(2.f)
+  , x18_distFalloff(12.f)
+  , x1c_frequency(3.f)
+  , x20_amplitude(0.25f)
+  , x24_lookupAmplitude(0.00098039221f)
+  , x28_ooTimeFalloff(0.f)
+  , x2c_ooDistFalloff(0.f)
+  , x30_ooPhase(0.f)
+  , x34_phase(0.f)
+  , x38_lookupPhase(0.f)
+  , x3c_(sub_8012f098())
+{
+  if (0.f < intensity && intensity < 1.f) {
+    static CRandom16 sRippleRandom(0xABBA);
+
+    float value1 = (intensity * (sRippleRandom.Float() - 0.5f)) * 2.f * 0.1f + intensity;
+    float tmp = 2.f * (0.0f < value1 ? (1.0f < value1 ? 1.0f : value1) : 0.0f);
+
+    x14_timeFalloff = 0.5f * tmp + 1.5f;
+    x18_distFalloff = 4.f * tmp + 8.f;
+    x1c_frequency = 2.f + tmp;
+    x20_amplitude = 0.15f * tmp + 0.1f;
+    x24_lookupAmplitude = x20_amplitude / 255.f;
+  }
+
+  x28_ooTimeFalloff = 1.f / x14_timeFalloff;
+  x2c_ooDistFalloff = 1.f / x18_distFalloff;
+  x30_ooPhase = x18_distFalloff / 2.5f;
+  x34_phase = 1.f / x30_ooPhase;
+  x38_lookupPhase = 256.f * x34_phase;
+}