MeshTools: recognize JointIds and Weights in removeDuplicatesFuzzy().

To be clear -- it would work even without, as it'd fall back to
calculating the range of the weights attribute and choosing an epsilon
based on that, but now it takes a shortcut as Weights are known to be in
a [0, 1] range.

src/Magnum/MeshTools/RemoveDuplicates.cpp

@@ -520,6 +520,7 @@ Trade::MeshData removeDuplicatesFuzzy(const Trade::MeshData& data, const Float f
                    applies), use epsilon as-is */
                 case Trade::MeshAttribute::TextureCoordinates:
                 case Trade::MeshAttribute::Color:
+                case Trade::MeshAttribute::Weights:
                     attributeEpsilon = floatEpsilon;
                     break;
 
@@ -538,6 +539,7 @@ Trade::MeshData removeDuplicatesFuzzy(const Trade::MeshData& data, const Float f
                 /* These shouldn't be floating point */
                 /* LCOV_EXCL_START */
                 case Trade::MeshAttribute::ObjectId:
+                case Trade::MeshAttribute::JointIds:
                     CORRADE_INTERNAL_ASSERT_UNREACHABLE();
                 /* LCOV_EXCL_STOP */
             }

src/Magnum/MeshTools/Test/RemoveDuplicatesTest.cpp

@@ -167,7 +167,31 @@ const struct {
         Trade::MeshAttributeData{Trade::MeshAttribute::TextureCoordinates,
             VertexFormat::Vector2, 4*sizeof(Float), 10, 6*sizeof(Float)}
         /* Fit into the epsilon again */
-    }), 0.0f, 10.0f, 10.0f*Math::TypeTraits<Float>::epsilon(), 7, false}
+    }), 0.0f, 10.0f, 10.0f*Math::TypeTraits<Float>::epsilon(), 7, false},
+    /* Nothing special here, just verifying these (array) attributes get
+       handled properly */
+    {"jointId[3] + weight[3], texcoord", Containers::array({
+        Trade::MeshAttributeData{Trade::MeshAttribute::JointIds,
+            /* It's a float, but interpreting as UnsignedInt. The first 2
+               floats out of 6 are bit-exact so integer comparison should work
+               as well; the second 2 are then with the epsilon.  */
+            VertexFormat::UnsignedInt, 0, 10, 6*sizeof(Float), 2},
+        Trade::MeshAttributeData{Trade::MeshAttribute::Weights,
+            VertexFormat::Float, 2*sizeof(Float), 10, 6*sizeof(Float), 2},
+        Trade::MeshAttributeData{Trade::MeshAttribute::TextureCoordinates,
+            VertexFormat::Vector2, 4*sizeof(Float), 10, 6*sizeof(Float)}
+    }), 0.0f, 1.0f, Math::TypeTraits<Float>::epsilon(), 7, false},
+    {"jointId[3] + weight[3], epsilon 0", Containers::array({
+        Trade::MeshAttributeData{Trade::MeshAttribute::JointIds,
+            /* It's a float, but interpreting as UnsignedInt. The first 2
+               floats out of 6 are bit-exact so integer comparison should work
+               as well; the second 2 are then with the epsilon.  */
+            VertexFormat::UnsignedInt, 0, 10, 6*sizeof(Float), 2},
+        Trade::MeshAttributeData{Trade::MeshAttribute::Weights,
+            VertexFormat::Float, 2*sizeof(Float), 10, 6*sizeof(Float), 2},
+        Trade::MeshAttributeData{Trade::MeshAttribute::TextureCoordinates,
+            VertexFormat::Vector2, 4*sizeof(Float), 10, 6*sizeof(Float)}
+    }), 0.0f, 1.0f, 0.0f, 9, false},
 };
 
 RemoveDuplicatesTest::RemoveDuplicatesTest() {