1 files changed, 11 insertions, 8 deletions

diff --git a/indra/newview/gltf/primitive.cpp b/indra/newview/gltf/primitive.cpp
index 4cff0622b3..dd37b5b4d0 100644
--- a/indra/newview/gltf/primitive.cpp
+++ b/indra/newview/gltf/primitive.cpp
@@ -56,7 +56,7 @@ struct MikktMesh
     bool copy(const Primitive* prim)
     {
         bool indexed = !prim->mIndexArray.empty();
-        U32 vert_count = indexed ? prim->mIndexArray.size() : prim->mPositions.size();
+        auto vert_count = indexed ? prim->mIndexArray.size() : prim->mPositions.size();
 
         U32 triangle_count = 0;
 
@@ -171,8 +171,8 @@ struct MikktMesh
 
     void genNormals()
     {
-        U32 tri_count = p.size() / 3;
-        for (U32 i = 0; i < tri_count; ++i)
+        size_t tri_count = p.size() / 3;
+        for (size_t i = 0; i < tri_count; ++i)
         {
             LLVector3 v0 = p[i * 3];
             LLVector3 v1 = p[i * 3 + 1];
@@ -240,7 +240,7 @@ struct MikktMesh
                     {
             prim->mTexCoords1.resize(vert_count);
         }
-        
+
         prim->mIndexArray.resize(remap.size());
 
         for (int i = 0; i < remap.size(); ++i)
@@ -511,7 +511,10 @@ bool Primitive::prep(Asset& asset)
     }
 
     mVertexBuffer = new LLVertexBuffer(mask);
-    mVertexBuffer->allocateBuffer(mPositions.size(), mIndexArray.size() * 2); // double the size of the index buffer for 32-bit indices
+    // we store these buffer sizes as S32 elsewhere
+    llassert(mPositions.size() <= size_t(S32_MAX));
+    llassert(mIndexArray.size() <= size_t(S32_MAX / 2));
+    mVertexBuffer->allocateBuffer(U32(mPositions.size()), U32(mIndexArray.size() * 2)); // double the size of the index buffer for 32-bit indices
 
     mVertexBuffer->setBuffer();
     mVertexBuffer->setPositionData(mPositions.data());
@@ -544,7 +547,7 @@ bool Primitive::prep(Asset& asset)
         mVertexBuffer->setTexCoord1Data(mTexCoords1.data());
         vertical_flip(mTexCoords1);
     }
-    
+
 
     if (!mIndexArray.empty())
     {
@@ -724,8 +727,8 @@ const LLVolumeTriangle* Primitive::lineSegmentIntersect(const LLVector4a& start,
     face.mTangents = mTangents.data();
     face.mIndices = nullptr; // unreferenced
 
-    face.mNumIndices = mIndexArray.size();
-    face.mNumVertices = mPositions.size();
+    face.mNumIndices = S32(mIndexArray.size());
+    face.mNumVertices = S32(mPositions.size());
 
     LLOctreeTriangleRayIntersect intersect(start, dir, &face, &closest_t, intersection, tex_coord, normal, tangent_out);
     intersect.traverse(mOctree);