diff --git a/src/d3d9/d3d9_mem.cpp b/src/d3d9/d3d9_mem.cpp
index c288fd3ac..ec2562469 100644
--- a/src/d3d9/d3d9_mem.cpp
+++ b/src/d3d9/d3d9_mem.cpp
@@ -7,6 +7,8 @@
 
 #ifdef D3D9_ALLOW_UNMAPPING
 #include <sysinfoapi.h>
+#else
+#include <stdlib.h>
 #endif
 
 namespace dxvk {
@@ -287,6 +289,59 @@ namespace dxvk {
     return m_ptr;
   }
 
+#else
+
+  D3D9Memory D3D9MemoryAllocator::Alloc(uint32_t Size) {
+    D3D9Memory memory(this, Size);
+    m_allocatedMemory += Size;
+    return memory;
+  }
+
+  uint32_t D3D9MemoryAllocator::MappedMemory() {
+    return m_allocatedMemory.load();
+  }
+
+  uint32_t D3D9MemoryAllocator::UsedMemory() {
+    return m_allocatedMemory.load();
+  }
+
+  uint32_t D3D9MemoryAllocator::AllocatedMemory() {
+    return m_allocatedMemory.load();
+  }
+
+  D3D9Memory::D3D9Memory(D3D9MemoryAllocator* pAllocator, size_t Size)
+    : m_allocator (pAllocator),
+      m_ptr       (malloc(Size)),
+      m_size      (Size) {}
+
+  D3D9Memory::D3D9Memory(D3D9Memory&& other)
+    : m_allocator(std::exchange(other.m_allocator, nullptr)),
+      m_ptr(std::exchange(other.m_ptr, nullptr)),
+      m_size(std::exchange(other.m_size, 0)) {}
+
+  D3D9Memory::~D3D9Memory() {
+    this->Free();
+  }
+
+  D3D9Memory& D3D9Memory::operator = (D3D9Memory&& other) {
+    this->Free();
+
+    m_allocator = std::exchange(other.m_allocator, nullptr);
+    m_ptr = std::exchange(other.m_ptr, nullptr);
+    m_size = std::exchange(other.m_size, 0);
+    return *this;
+  }
+
+  void D3D9Memory::Free() {
+    if (m_ptr == nullptr)
+      return;
+
+    free(m_ptr);
+    m_ptr = nullptr;
+    m_allocator->NotifyFreed(m_size);
+  }
+
+
 #endif
 
 }
diff --git a/src/d3d9/d3d9_mem.h b/src/d3d9/d3d9_mem.h
index b0d61f053..1da862653 100644
--- a/src/d3d9/d3d9_mem.h
+++ b/src/d3d9/d3d9_mem.h
@@ -126,25 +126,49 @@ namespace dxvk {
   };
 
 #else
-    class D3D9Memory {
+  class D3D9Memory {
+    friend D3D9MemoryAllocator;
+
     public:
-      operator bool() const { return false; }
+      D3D9Memory() {}
+      ~D3D9Memory();
+
+      D3D9Memory             (const D3D9Memory&) = delete;
+      D3D9Memory& operator = (const D3D9Memory&) = delete;
+
+      D3D9Memory             (D3D9Memory&& other);
+      D3D9Memory& operator = (D3D9Memory&& other);
+
+      operator bool() const { return m_ptr != nullptr; }
 
       void Map() {}
       void Unmap() {}
-      void* Ptr() { return nullptr; }
+      void* Ptr() { return m_ptr; }
+      size_t GetSize() const { return m_size; }
 
     private:
+      D3D9Memory(D3D9MemoryAllocator* pAllocator, size_t Size);
       void Free();
+
+      D3D9MemoryAllocator* m_allocator = nullptr;
+      void* m_ptr                      = nullptr;
+      size_t m_size                    = 0;
     };
 
     class D3D9MemoryAllocator {
 
     public:
-      D3D9Memory Alloc(uint32_t Size) { return { }; }
-      uint32_t MappedMemory() { return 0; }
-      uint32_t UsedMemory() { return 0; }
-      uint32_t AllocatedMemory() { return 0; }
+      D3D9Memory Alloc(uint32_t Size);
+      uint32_t MappedMemory();
+      uint32_t UsedMemory();
+      uint32_t AllocatedMemory();
+      void NotifyFreed(uint32_t Size) {
+        m_allocatedMemory -= Size;
+      }
+
+    private:
+      std::atomic<size_t> m_allocatedMemory = 0;
+
     };
 
 #endif