fixing command pool, adding base command buffer dispatch table

src/vulkan/CommandBuffer.zig

@@ -10,6 +10,12 @@ pub const ObjectType: vk.ObjectType = .command_buffer;
 owner: *Device,
 
 vtable: *const VTable,
+dispatch_table: *const DispatchTable,
+
+pub const DispatchTable = struct {
+    begin: *const fn (*Self, *const vk.CommandBufferBeginInfo) VkError!void,
+    end: *const fn (*Self) VkError!void,
+};
 
 pub const VTable = struct {
     destroy: *const fn (*Self, std.mem.Allocator) void,
@@ -21,9 +27,18 @@ pub fn init(device: *Device, allocator: std.mem.Allocator, info: *const vk.Comma
     return .{
         .owner = device,
         .vtable = undefined,
+        .dispatch_table = undefined,
     };
 }
 
 pub inline fn destroy(self: *Self, allocator: std.mem.Allocator) void {
     self.vtable.destroy(self, allocator);
 }
+
+pub inline fn begin(self: *Self, info: *const vk.CommandBufferBeginInfo) VkError!void {
+    try self.dispatch_table.begin(self, info);
+}
+
+pub inline fn end(self: *Self) VkError!void {
+    try self.dispatch_table.end(self);
+}