3 files changed, 19 insertions, 16 deletions

diff --git a/indra/newview/gltf/accessor.cpp b/indra/newview/gltf/accessor.cpp
index 9f1cb0c1cd..2ef9237f2d 100644
--- a/indra/newview/gltf/accessor.cpp
+++ b/indra/newview/gltf/accessor.cpp
@@ -108,7 +108,8 @@ void Buffer::erase(Asset& asset, S32 offset, S32 length)
 
     mData.erase(mData.begin() + offset, mData.begin() + offset + length);
 
-    mByteLength = mData.size();
+    llassert(mData.size() <= size_t(INT_MAX));
+    mByteLength = S32(mData.size());
 
     for (BufferView& view : asset.mBufferViews)
     {
@@ -141,7 +142,7 @@ bool Buffer::prep(Asset& asset)
         }
 
         mData.resize(mByteLength);
-        if (!file.read((U8*)mData.data(), mData.size()))
+        if (!file.read((U8*)mData.data(), mByteLength))
         {
             LL_WARNS("GLTF") << "Failed to load buffer data from asset: " << id << LL_ENDL;
             return false;
diff --git a/indra/newview/gltf/animation.cpp b/indra/newview/gltf/animation.cpp
index 45e9e1ddef..8f53c28539 100644
--- a/indra/newview/gltf/animation.cpp
+++ b/indra/newview/gltf/animation.cpp
@@ -189,16 +189,15 @@ void Animation::Sampler::getFrameInfo(Asset& asset, F32 time, U32& frameIndex, F
 
     if (mFrameTimes.size() > 1)
     {
+        llassert(mFrameTimes.size() <= size_t(U32_MAX));
+        frameIndex = U32(mFrameTimes.size()) - 2;
+        t = 1.f;
+
         if (time > mMaxTime)
         {
-            frameIndex = mFrameTimes.size() - 2;
-            t = 1.0f;
             return;
         }
 
-        frameIndex = mFrameTimes.size() - 2;
-        t = 1.f;
-
         for (U32 i = 0; i < mFrameTimes.size() - 1; i++)
         {
             if (time >= mFrameTimes[i] && time < mFrameTimes[i + 1])
@@ -382,7 +381,7 @@ void Skin::uploadMatrixPalette(Asset& asset)
         glGenBuffers(1, &mUBO);
     }
 
-    U32 joint_count = llmin(max_joints, mJoints.size());
+    size_t joint_count = llmin<size_t>(max_joints, mJoints.size());
 
     std::vector<mat4> t_mp;
 
diff --git a/indra/newview/gltf/primitive.cpp b/indra/newview/gltf/primitive.cpp
index bc333aff69..197ffb68e8 100644
--- a/indra/newview/gltf/primitive.cpp
+++ b/indra/newview/gltf/primitive.cpp
@@ -55,7 +55,7 @@ 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();
 
         if (prim->mMode != Primitive::Mode::TRIANGLES)
         {
@@ -85,7 +85,7 @@ struct MikktMesh
             j.resize(vert_count);
         }
 
-        for (int i = 0; i < vert_count; ++i)
+        for (U32 i = 0; i < vert_count; ++i)
         {
             U32 idx = indexed ? prim->mIndexArray[i] : i;
 
@@ -110,8 +110,8 @@ 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];
@@ -166,7 +166,7 @@ struct MikktMesh
             prim->mWeights.resize(vert_count);
             prim->mJoints.resize(vert_count);
         }
-        
+
         prim->mIndexArray.resize(remap.size());
 
         for (int i = 0; i < remap.size(); ++i)
@@ -411,7 +411,10 @@ 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());
@@ -619,8 +622,8 @@ 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);