From af5d17e6af1acf45b26f49040cb4e0e1708a577d Mon Sep 17 00:00:00 2001
From: ohlidalp <petr@ohlidal.cz>
Date: Mon, 27 Jan 2025 01:12:28 +0100
Subject: [PATCH] :ocean: Fixed waves on water not respecting sim time
 (pause/slomo/t.lapse).

---
 source/main/gfx/Water.cpp | 5 ++---
 source/main/gfx/Water.h   | 1 +
 2 files changed, 3 insertions(+), 3 deletions(-)

diff --git a/source/main/gfx/Water.cpp b/source/main/gfx/Water.cpp
index 4d78b985fb..8ff0cdc946 100644
--- a/source/main/gfx/Water.cpp
+++ b/source/main/gfx/Water.cpp
@@ -511,8 +511,6 @@ float Water::CalcWavesHeight(Vector3 pos)
         return m_water_height;
     }
 
-    const float time_sec = (float)(App::GetAppContext()->GetOgreRoot()->getTimer()->getMilliseconds() * 0.001);
-
     // uh, some upper limit?!
     if (pos.y > m_water_height + m_max_ampl)
         return m_water_height;
@@ -528,7 +526,7 @@ float Water::CalcWavesHeight(Vector3 pos)
         float amp = std::min(m_wavetrain_defs[i].amplitude * waveheight, m_wavetrain_defs[i].maxheight);
         // now the main thing:
         // calculate the sinus with the values of the config file and add it to the result
-        result += amp * sin(Math::TWO_PI * ((time_sec * m_wavetrain_defs[i].wavespeed + m_wavetrain_defs[i].dir_sin * pos.x + m_wavetrain_defs[i].dir_cos * pos.z) / m_wavetrain_defs[i].wavelength));
+        result += amp * sin(Math::TWO_PI * ((m_sim_time_counter * m_wavetrain_defs[i].wavespeed + m_wavetrain_defs[i].dir_sin * pos.x + m_wavetrain_defs[i].dir_cos * pos.z) / m_wavetrain_defs[i].wavelength));
     }
     // return the summed up waves
     return result;
@@ -613,6 +611,7 @@ void Water::FrameStepWater(float dt)
     // Update even if game paused to account for camera movement (important for reflections).
     // --------------------------------------------------------------------------------------
     this->UpdateWater();
+    m_sim_time_counter += dt;
 }
 
 void Water::SetForcedCameraTransform(Ogre::Radian fovy, Ogre::Vector3 pos, Ogre::Quaternion rot)
diff --git a/source/main/gfx/Water.h b/source/main/gfx/Water.h
index c7197d1ee5..b9b0d14cf6 100644
--- a/source/main/gfx/Water.h
+++ b/source/main/gfx/Water.h
@@ -108,6 +108,7 @@ class Water : public IWater
     float                 m_max_ampl = 0.f;
     float                 m_waterplane_mesh_scale = 1.f;
     int                   m_frame_counter = 0;
+    float                 m_sim_time_counter = 0.f; //!< Elapsed simulation time in seconds.
     Ogre::Vector3         m_map_size = Ogre::Vector3::ZERO;
     Ogre::Plane           m_water_plane;
     Ogre::MeshPtr         m_waterplane_mesh;