Fix: Vulkan Buffer Update Not Visible Without Explicit Flush

Updated uniform buffer; submitted; shader reads stale data.

Use host-coherent memory

Allocate with VK_MEMORY_PROPERTY_HOST_COHERENT_BIT. Writes auto-visible.

Or flush manually

vkFlushMappedMemoryRanges(...);

Explicit; required for non-coherent memory.

Audit memory flags

Each allocation's memory type. Mismatched assumptions = the visibility bug.

“Memory coherency is explicit in Vulkan. Choose deliberately.”

Build a small allocator helper that returns coherent memory by default. Manual flushing surfaces the bug class.

Related reading

• Fix: Vulkan Validation Buffer Device Address Mismatch
• Fix: Vulkan Staging Buffer Too Small Large Asset
• Fix: Vulkan Buffer Device Address Corruption Shader Cache
• Fix: Vulkan Pipeline Cache Binary Rejected By Driver Update