Change structure member sType to non-const to allow default assignment operator. Make copy constructor and copy assignment default. The latter is required for C++20 designated initializers. Delegate the constructor from C-type to the copy constructor by casting rhs accordingly. Fix warnings on gcc/clang.

samples/utils/math.hpp

@@ -25,8 +25,18 @@
 #include <vulkan/vulkan.hpp>
 
 #define GLM_FORCE_RADIANS
+
+#if defined( _MSC_VER )
+#  pragma warning( push )
+#  pragma warning( disable : 4127 )  // conditional expression is constant (glm)
+#endif
+
 #include <glm/gtc/matrix_transform.hpp>
 
+#if defined( _MSC_VER )
+#  pragma warning( pop )
+#endif
+
 namespace vk
 {
   namespace su