From 1d9d39328d9b1cdbde81fa78b6581d4d09ae4176 Mon Sep 17 00:00:00 2001
From: UbitUmarov <ajlduarte@sapo.pt>
Date: Tue, 4 Jun 2024 09:05:03 +0100
Subject: [PATCH] add osTemperatureToLinearColor()

---
 .../Shared/Api/Implementation/OSSL_Api.cs     | 34 +++++++++++++++++++
 .../Shared/Api/Interface/IOSSL_Api.cs         |  1 +
 .../Shared/Api/Runtime/OSSL_Stub.cs           |  6 ++++
 3 files changed, 41 insertions(+)

diff --git a/OpenSim/Region/ScriptEngine/Shared/Api/Implementation/OSSL_Api.cs b/OpenSim/Region/ScriptEngine/Shared/Api/Implementation/OSSL_Api.cs
index 6604c15d14..5b83c0f83f 100644
--- a/OpenSim/Region/ScriptEngine/Shared/Api/Implementation/OSSL_Api.cs
+++ b/OpenSim/Region/ScriptEngine/Shared/Api/Implementation/OSSL_Api.cs
@@ -6589,5 +6589,39 @@ namespace OpenSim.Region.ScriptEngine.Shared.Api
 
             return LSL_Vector.Zero;
         }
+
+        public LSL_Vector osTemperatureToLinearColor(LSL_Float dtemp)
+        {
+            float temp = (float)dtemp.value;
+            if (temp <= 1000f)
+                return new LSL_Vector(1.0, 0.0401, 0);
+            else if (temp >= 40000f)
+                return new LSL_Vector(0.3277, 0.5022, 1.0);
+
+            float green;
+            if (temp < 6600f)
+            {
+                green = temp - 1000f;
+                green = ((((-7.87308e-13f * green) - 7.10085e-9f) * green) + 0.00022693f) * green + 0.0374249f;
+                green = Math.Clamp(green, 0, 1.0f);
+
+                if (temp <= 19.0f)
+                    return new LSL_Vector(1.0, green, 0);
+
+                float blue = temp - 1900f;
+                blue = ((((-5.97E-12f * blue) + 5.49E-08f) * blue) + 8.85465E-05f) * blue - 0.0058959f;
+                blue = Math.Clamp(blue, 0f, 1.0f);
+
+                return new LSL_Vector(1.0, green, blue);
+            }
+
+            temp = 0.01f * (temp - 6000f);
+            float red = 1.897315f * MathF.Pow(temp, -0.346837f) + 0.0622044f;
+            red = Math.Clamp(red, 0, 1.0f);
+
+            green = 1.261989f * MathF.Pow(temp, -0.251708f) + 0.200836f;
+            green = Math.Clamp(green, 0, 1.0f);
+            return new LSL_Vector(red, green, 1.0f);
+        }
     }
 }
\ No newline at end of file
diff --git a/OpenSim/Region/ScriptEngine/Shared/Api/Interface/IOSSL_Api.cs b/OpenSim/Region/ScriptEngine/Shared/Api/Interface/IOSSL_Api.cs
index ea38af8a65..259717059a 100644
--- a/OpenSim/Region/ScriptEngine/Shared/Api/Interface/IOSSL_Api.cs
+++ b/OpenSim/Region/ScriptEngine/Shared/Api/Interface/IOSSL_Api.cs
@@ -627,5 +627,6 @@ namespace OpenSim.Region.ScriptEngine.Shared.Api.Interfaces
         LSL_String osAESDecrypt(string secret, string encryptedText);
         LSL_String osAESDecryptFrom(string secret, string encryptedText, string ivString);
             vector osGetLinkColor(LSL_Integer linknum, LSL_Integer face);
+            vector osTemperatureToLinearColor(LSL_Float dtemp);
     }
 }
diff --git a/OpenSim/Region/ScriptEngine/Shared/Api/Runtime/OSSL_Stub.cs b/OpenSim/Region/ScriptEngine/Shared/Api/Runtime/OSSL_Stub.cs
index a76385c48d..36eb3a7275 100644
--- a/OpenSim/Region/ScriptEngine/Shared/Api/Runtime/OSSL_Stub.cs
+++ b/OpenSim/Region/ScriptEngine/Shared/Api/Runtime/OSSL_Stub.cs
@@ -1807,5 +1807,11 @@ namespace OpenSim.Region.ScriptEngine.Shared.ScriptBase
         {
             return m_OSSL_Functions.osGetLinkColor(link, face);
         }
+
+        [MethodImpl(MethodImplOptions.AggressiveInlining)]
+        public vector osTemperatureToLinearColor(LSL_Float dtemp)
+        {
+            return m_OSSL_Functions.osTemperatureToLinearColor(dtemp);
+        }
     }
 }