From 4984ba1bb3c79ecacb13c5dbe0797daaf2587aba Mon Sep 17 00:00:00 2001
From: Wojtek Figat <wojtek@figat.pl>
Date: Fri, 13 Aug 2021 09:58:57 +0200
Subject: [PATCH] Add `CookCollision` to collision data with triangles as
 `int32`

---
 Source/Engine/Physics/CollisionData.cpp | 15 +++++++++++++++
 Source/Engine/Physics/CollisionData.h   | 13 +++++++++++++
 2 files changed, 28 insertions(+)

diff --git a/Source/Engine/Physics/CollisionData.cpp b/Source/Engine/Physics/CollisionData.cpp
index 14396bf6a..10dc38e6b 100644
--- a/Source/Engine/Physics/CollisionData.cpp
+++ b/Source/Engine/Physics/CollisionData.cpp
@@ -78,6 +78,21 @@ bool CollisionData::CookCollision(CollisionDataType type, const Span<Vector3>& v
     return CookCollision(type, &modelData, convexFlags, convexVertexLimit);
 }
 
+bool CollisionData::CookCollision(CollisionDataType type, const Span<Vector3>& vertices, const Span<int32>& triangles, ConvexMeshGenerationFlags convexFlags, int32 convexVertexLimit)
+{
+    CHECK_RETURN(vertices.Length() != 0, true);
+    CHECK_RETURN(triangles.Length() != 0 && triangles.Length() % 3 == 0, true);
+    ModelData modelData;
+    modelData.LODs.Resize(1);
+    auto meshData = New<MeshData>();
+    modelData.LODs[0].Meshes.Add(meshData);
+    meshData->Positions.Set(vertices.Get(), vertices.Length());
+    meshData->Indices.Resize(triangles.Length());
+    for (int32 i = 0; i < triangles.Length(); i++)
+        meshData->Indices.Get()[i] = triangles.Get()[i];
+    return CookCollision(type, &modelData, convexFlags, convexVertexLimit);
+}
+
 bool CollisionData::CookCollision(CollisionDataType type, ModelData* modelData, ConvexMeshGenerationFlags convexFlags, int32 convexVertexLimit)
 {
     // Validate state
diff --git a/Source/Engine/Physics/CollisionData.h b/Source/Engine/Physics/CollisionData.h
index 9436ac80d..19c1efa03 100644
--- a/Source/Engine/Physics/CollisionData.h
+++ b/Source/Engine/Physics/CollisionData.h
@@ -223,6 +223,19 @@ public:
     /// <param name="convexVertexLimit">The convex mesh vertex limit. Use values in range [8;255]</param>
     API_FUNCTION() bool CookCollision(CollisionDataType type, const Span<Vector3>& vertices, const Span<uint32>& triangles, ConvexMeshGenerationFlags convexFlags = ConvexMeshGenerationFlags::None, int32 convexVertexLimit = 255);
 
+    /// <summary>
+    /// Cooks the mesh collision data and updates the virtual asset. action cannot be performed on a main thread.
+    /// </summary>
+    /// <remarks>
+    /// Can be used only for virtual assets (see <see cref="Asset.IsVirtual"/> and <see cref="Content.CreateVirtualAsset{T}"/>).
+    /// </remarks>
+    /// <param name="type">The collision data type.</param>
+    /// <param name="vertices">The source geometry vertex buffer with vertices positions. Cannot be empty.</param>
+    /// <param name="triangles">The source data index buffer (triangles list). Uses 32-bit stride buffer. Cannot be empty. Length must be multiple of 3 (as 3 vertices build a triangle).</param>
+    /// <param name="convexFlags">The convex mesh generation flags.</param>
+    /// <param name="convexVertexLimit">The convex mesh vertex limit. Use values in range [8;255]</param>
+    API_FUNCTION() bool CookCollision(CollisionDataType type, const Span<Vector3>& vertices, const Span<int32>& triangles, ConvexMeshGenerationFlags convexFlags = ConvexMeshGenerationFlags::None, int32 convexVertexLimit = 255);
+
     /// <summary>
     /// Cooks the mesh collision data and updates the virtual asset. action cannot be performed on a main thread.
     /// </summary>