Merge branch 'precomputedbonematrices' into 'master'

Precompute bone matrices before skinning

See merge request OpenMW/openmw!4467

components/sceneutil/riggeometry.cpp

@@ -170,18 +170,26 @@ namespace SceneUtil
         osg::Vec3Array* normalDst = static_cast<osg::Vec3Array*>(geom.getNormalArray());
         osg::Vec4Array* tangentDst = static_cast<osg::Vec4Array*>(geom.getTexCoordArray(7));
 
+        std::vector<osg::Matrixf> boneMatrices(mNodes.size());
+        std::vector<Bone*>::const_iterator bone = mNodes.begin();
+        std::vector<BoneInfo>::const_iterator boneInfo = mData->mBones.begin();
+        for (osg::Matrixf& boneMat : boneMatrices)
+        {
+            if (*bone != nullptr)
+                boneMat = boneInfo->mInvBindMatrix * (*bone)->mMatrixInSkeletonSpace;
+            ++bone;
+            ++boneInfo;
+        }
+
         for (const auto& [influences, vertices] : mData->mInfluences)
         {
             osg::Matrixf resultMat(0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 1);
 
             for (const auto& [index, weight] : influences)
             {
-                const Bone* bone = mNodes[index];
-                if (bone == nullptr)
+                if (mNodes[index] == nullptr)
                     continue;
-
-                osg::Matrixf boneMat = mData->mBones[index].mInvBindMatrix * bone->mMatrixInSkeletonSpace;
-                float* boneMatPtr = boneMat.ptr();
+                const float* boneMatPtr = boneMatrices[index].ptr();
                 float* resultMatPtr = resultMat.ptr();
                 for (int i = 0; i < 16; ++i, ++resultMatPtr, ++boneMatPtr)
                     if (i % 4 != 3)