From 5012d4432e762ba22ce8b250b560cef131c73076 Mon Sep 17 00:00:00 2001
From: Wojtek Figat <wojtek@figat.pl>
Date: Mon, 17 Jul 2023 18:22:40 +0200
Subject: [PATCH] Add NvCloth for Linux

---
 Source/Engine/Physics/Actors/Cloth.cpp                    | 2 ++
 .../Platforms/Linux/Binaries/ThirdParty/x64/libNvCloth.a  | 3 +++
 Source/ThirdParty/NvCloth/NvCloth.Build.cs                | 1 +
 Source/Tools/Flax.Build/Deps/Dependencies/NvCloth.cs      | 8 ++++++++
 4 files changed, 14 insertions(+)
 create mode 100644 Source/Platforms/Linux/Binaries/ThirdParty/x64/libNvCloth.a

diff --git a/Source/Engine/Physics/Actors/Cloth.cpp b/Source/Engine/Physics/Actors/Cloth.cpp
index a7ab5fe0e..5dc53af8b 100644
--- a/Source/Engine/Physics/Actors/Cloth.cpp
+++ b/Source/Engine/Physics/Actors/Cloth.cpp
@@ -724,6 +724,7 @@ void Cloth::CalculateInvMasses(Array<float>& invMasses)
 
 void Cloth::OnPreUpdate()
 {
+#if WITH_CLOTH
     // Get current skinned mesh pose for the simulation of the non-kinematic vertices
     if (auto* animatedModel = Cast<AnimatedModel>(GetParent()))
     {
@@ -806,6 +807,7 @@ void Cloth::OnPreUpdate()
 
         PhysicsBackend::UnlockClothParticles(_cloth);
     }
+#endif
 }
 
 void Cloth::OnPostUpdate()
diff --git a/Source/Platforms/Linux/Binaries/ThirdParty/x64/libNvCloth.a b/Source/Platforms/Linux/Binaries/ThirdParty/x64/libNvCloth.a
new file mode 100644
index 000000000..573dfb245
--- /dev/null
+++ b/Source/Platforms/Linux/Binaries/ThirdParty/x64/libNvCloth.a
@@ -0,0 +1,3 @@
+version https://git-lfs.github.com/spec/v1
+oid sha256:6234ee8e0cea08be467f8d13994fee8b94dfa2ed2147460a3268dbe6cfeb87a6
+size 553518
diff --git a/Source/ThirdParty/NvCloth/NvCloth.Build.cs b/Source/ThirdParty/NvCloth/NvCloth.Build.cs
index 3be1e903e..a28d619af 100644
--- a/Source/ThirdParty/NvCloth/NvCloth.Build.cs
+++ b/Source/ThirdParty/NvCloth/NvCloth.Build.cs
@@ -37,6 +37,7 @@ public class NvCloth : DepsModule
         case TargetPlatform.Android:
         case TargetPlatform.Mac:
         case TargetPlatform.iOS:
+        case TargetPlatform.Linux:
             libName = "NvCloth";
             break;
         case TargetPlatform.Switch:
diff --git a/Source/Tools/Flax.Build/Deps/Dependencies/NvCloth.cs b/Source/Tools/Flax.Build/Deps/Dependencies/NvCloth.cs
index b096eef24..6e565b94c 100644
--- a/Source/Tools/Flax.Build/Deps/Dependencies/NvCloth.cs
+++ b/Source/Tools/Flax.Build/Deps/Dependencies/NvCloth.cs
@@ -89,6 +89,9 @@ namespace Flax.Deps.Dependencies
                 case TargetPlatform.iOS:
                     Build(options, platform, TargetArchitecture.ARM64);
                     break;
+                case TargetPlatform.Linux:
+                    Build(options, platform, TargetArchitecture.x64);
+                    break;
                 }
             }
 
@@ -157,6 +160,11 @@ namespace Flax.Deps.Dependencies
                 cmakeName = "ios";
                 binariesPrefix = "lib";
                 break;
+            case TargetPlatform.Linux:
+                cmakeArgs += " -DTARGET_BUILD_PLATFORM=linux";
+                cmakeName = "linux";
+                binariesPrefix = "lib";
+                break;
             default: throw new InvalidPlatformException(platform);
             }
             var cmakeFolder = Path.Combine(nvCloth, "compiler", "cmake", cmakeName);