adding base Buffer, refactoring of unnecessary device layer functions

src/vulkan/Buffer.zig

@@ -18,6 +18,7 @@ allowed_memory_types: u32,
 vtable: *const VTable,
 
 pub const VTable = struct {
+    destroy: *const fn (*Self, std.mem.Allocator) void,
     getMemoryRequirements: *const fn (*Self, *vk.MemoryRequirements) void,
 };
 
@@ -34,6 +35,10 @@ pub fn init(device: *Device, allocator: std.mem.Allocator, info: *const vk.Buffe
     };
 }
 
+pub inline fn destroy(self: *Self, allocator: std.mem.Allocator) void {
+    self.vtable.destroy(self, allocator);
+}
+
 pub inline fn bindMemory(self: *Self, memory: *DeviceMemory, offset: vk.DeviceSize) VkError!void {
     if (offset >= self.size or self.allowed_memory_types & memory.memory_type_index == 0) {
         return VkError.ValidationFailed;
@@ -41,3 +46,9 @@ pub inline fn bindMemory(self: *Self, memory: *DeviceMemory, offset: vk.DeviceSi
     self.memory = memory;
     self.offset = offset;
 }
+
+pub inline fn getMemoryRequirements(self: *Self, requirements: *vk.MemoryRequirements) void {
+    requirements.size = self.size;
+    requirements.memory_type_bits = self.allowed_memory_types;
+    self.vtable.getMemoryRequirements(self, requirements);
+}