[dxvk] Add helper to get size of memory/image in bytes

src/dxvk/dxvk_image.h

@@ -264,6 +264,15 @@ namespace dxvk {
       return result;
     }
 
+    /**
+     * \brief Memory size
+     * 
+     * \returns The memory size of the image
+     */
+    VkDeviceSize memSize() const {
+      return m_memory.length();
+    }
+    
   private:
     
     Rc<vk::DeviceFn>      m_vkd;

src/dxvk/dxvk_memory.h

@@ -122,6 +122,15 @@ namespace dxvk {
       return reinterpret_cast<char*>(m_mapPtr) + offset;
     }
 
+    /**
+     * \brief Returns length of memory allocated
+     * 
+     * \returns Memory size
+     */
+    VkDeviceSize length() const {
+      return m_length;
+    }
+
     /**
      * \brief Checks whether the memory slice is defined
      *