From 76e6f086417f2be78caa49a867d39d903ce77b45 Mon Sep 17 00:00:00 2001
From: lghassen <feeldapowa@hotmail.com>
Date: Sat, 15 May 2021 21:52:02 +0200
Subject: [PATCH] reduce ocean jittering in RSS

---
 .../Proland/Ocean/OceanCameraUpdateHook.cs    | 16 +++++++---
 scatterer/Scatterer.cs                        |  4 +--
 .../Shadows/DoublePrecisionEmulation.cginc    | 30 +++++++++++++++++++
 3 files changed, 44 insertions(+), 6 deletions(-)

diff --git a/scatterer/Effects/Proland/Ocean/OceanCameraUpdateHook.cs b/scatterer/Effects/Proland/Ocean/OceanCameraUpdateHook.cs
index b57d1c4d..6bbe6ae8 100644
--- a/scatterer/Effects/Proland/Ocean/OceanCameraUpdateHook.cs
+++ b/scatterer/Effects/Proland/Ocean/OceanCameraUpdateHook.cs
@@ -55,10 +55,18 @@ public void updateCameraSpecificUniforms (Material oceanMaterial, Camera inCamer
 			                                           ctol1.m10, ctol1.m11, ctol1.m12, ctol1.m13,
 			                                           ctol1.m20, ctol1.m21, ctol1.m22, ctol1.m23,
 			                                           ctol1.m30, ctol1.m31, ctol1.m32, ctol1.m33);
-			
-			Vector3d translation = oceanNode.m_manager.parentLocalTransform.position;
-			
-			
+
+			Vector3d translation;
+
+			if (HighLogic.LoadedScene == GameScenes.SPACECENTER)
+			{
+				translation = oceanNode.m_manager.parentLocalTransform.position;	//have to use this in space center or get the tsunami bug
+			}
+			else
+			{
+				translation = oceanNode.m_manager.parentCelestialBody.position;		//more precise, especially with RSS, but breaks a bit in KSC
+			}
+
 			Matrix4x4d worldToLocal = new Matrix4x4d(1, 0, 0, -translation.x,
 			                                         0, 1, 0, -translation.y,
 			                                         0, 0, 1, -translation.z,
diff --git a/scatterer/Scatterer.cs b/scatterer/Scatterer.cs
index ed79d0a2..03c9318c 100644
--- a/scatterer/Scatterer.cs
+++ b/scatterer/Scatterer.cs
@@ -11,7 +11,7 @@
 using UnityEngine;
 using UnityEngine.Rendering;
 
-[assembly:AssemblyVersion("0.0769")]
+[assembly:AssemblyVersion("0.0770")]
 namespace scatterer
 {
 	[KSPAddon(KSPAddon.Startup.EveryScene, false)]
@@ -54,7 +54,7 @@ public class Scatterer: MonoBehaviour
 		bool coreInitiated = false;
 		public bool isActive = false;
 		public bool unifiedCameraMode = false;
-		public string versionNumber = "0.0769 dev";
+		public string versionNumber = "0.0770";
 
 		public List<GenericAntiAliasing> antiAliasingScripts = new List<GenericAntiAliasing>();
 
diff --git a/scatterer/Shaders/scattererShaders/Assets/Shaders/Shadows/DoublePrecisionEmulation.cginc b/scatterer/Shaders/scattererShaders/Assets/Shaders/Shadows/DoublePrecisionEmulation.cginc
index 33adb2b1..9702e6a2 100644
--- a/scatterer/Shaders/scattererShaders/Assets/Shaders/Shadows/DoublePrecisionEmulation.cginc
+++ b/scatterer/Shaders/scattererShaders/Assets/Shaders/Shadows/DoublePrecisionEmulation.cginc
@@ -137,4 +137,34 @@ float2 ds_div (float2 dsa, float2 dsb) {
 	dsc.y = minus_frc(s2, minus_frc(dsc.x, s1));
 
 	return dsc;
+}
+
+
+float2 ds_sqrt (float2 dsa) {
+	float2 dsb;
+
+	float t1, t2, t3;
+	float2 f, s0, s1;
+
+	if (dsa.x == 0.0)
+	{
+		return float2(0.0,0.0);
+	}
+
+	t1 = div_frc(1.0, sqrt(dsa.x));
+	t2 = times_frc(dsa.x, t1);
+
+	s0 = ds_mul(ds_set(t2),ds_set(t2));
+	s1 = ds_sub(dsa, s0);
+
+	t3 = times_frc(0.5, times_frc(s1.x,t1));
+
+	s0.x = t2;
+	s0.y = 0.0;
+	s1.x = t3;
+	s1.y = 0.0;
+
+	dsb = ds_add(s0, s1);
+
+	return dsb;
 }
\ No newline at end of file