diff --git a/README.md b/README.md
index b6a2058..294eb2f 100644
--- a/README.md
+++ b/README.md
@@ -91,7 +91,7 @@ vkCmdSetStencilCompareMask                       | ✅ Implemented
 vkCmdSetStencilReference                         | ✅ Implemented
 vkCmdSetStencilWriteMask                         | ✅ Implemented
 vkCmdSetViewport                                 | ✅ Implemented
-vkCmdUpdateBuffer                                | ⚙️ WIP
+vkCmdUpdateBuffer                                | ✅ Implemented
 vkCmdWaitEvents                                  | ✅ Implemented
 vkCmdWriteTimestamp                              | ⚙️ WIP
 vkCreateBuffer                                   | ✅ Implemented
diff --git a/src/soft/SoftBinarySemaphore.zig b/src/soft/SoftBinarySemaphore.zig
index 880d694..7fe5aca 100644
--- a/src/soft/SoftBinarySemaphore.zig
+++ b/src/soft/SoftBinarySemaphore.zig
@@ -9,6 +9,9 @@ const Self = @This();
 pub const Interface = base.BinarySemaphore;
 
 interface: Interface,
+mutex: std.Io.Mutex,
+condition: std.Io.Condition,
+is_signaled: bool,
 
 pub fn create(device: *base.Device, allocator: std.mem.Allocator, info: *const vk.SemaphoreCreateInfo) VkError!*Self {
     const self = allocator.create(Self) catch return VkError.OutOfHostMemory;
@@ -18,10 +21,15 @@ pub fn create(device: *base.Device, allocator: std.mem.Allocator, info: *const v
 
     interface.vtable = &.{
         .destroy = destroy,
+        .signal = signal,
+        .wait = wait,
     };
 
     self.* = .{
         .interface = interface,
+        .mutex = .init,
+        .condition = .init,
+        .is_signaled = false,
     };
     return self;
 }
@@ -30,3 +38,27 @@ pub fn destroy(interface: *Interface, allocator: std.mem.Allocator) void {
     const self: *Self = @alignCast(@fieldParentPtr("interface", interface));
     allocator.destroy(self);
 }
+
+pub fn signal(interface: *Interface) VkError!void {
+    const self: *Self = @alignCast(@fieldParentPtr("interface", interface));
+    const io = interface.owner.io();
+
+    self.mutex.lock(io) catch return VkError.DeviceLost;
+    defer self.mutex.unlock(io);
+
+    self.is_signaled = true;
+    self.condition.broadcast(io);
+}
+
+pub fn wait(interface: *Interface) VkError!void {
+    const self: *Self = @alignCast(@fieldParentPtr("interface", interface));
+    const io = interface.owner.io();
+
+    self.mutex.lock(io) catch return VkError.DeviceLost;
+    defer self.mutex.unlock(io);
+
+    while (!self.is_signaled) {
+        self.condition.wait(io, &self.mutex) catch return VkError.DeviceLost;
+    }
+    self.is_signaled = false;
+}
diff --git a/src/soft/SoftBuffer.zig b/src/soft/SoftBuffer.zig
index 4f8cb06..aa85bd1 100644
--- a/src/soft/SoftBuffer.zig
+++ b/src/soft/SoftBuffer.zig
@@ -57,10 +57,10 @@ pub fn copyBuffer(self: *const Self, dst: *Self, regions: []const vk.BufferCopy)
 }
 
 pub fn fillBuffer(self: *Self, offset: vk.DeviceSize, size: vk.DeviceSize, data: u32) VkError!void {
-    const memory = if (self.interface.memory) |memory| memory else return VkError.InvalidDeviceMemoryDrv;
-    var bytes = if (size == vk.WHOLE_SIZE) memory.size - offset else size;
+    if (self.interface.memory == null) return VkError.InvalidDeviceMemoryDrv;
+    var bytes = if (size == vk.WHOLE_SIZE) self.interface.size - offset else size;
 
-    const map = try self.mapAsSliceWithOffset(u32, offset, @divFloor(bytes, @sizeOf(u32)) * @sizeOf(u32));
+    const map = try self.mapAsSliceWithAddedOffset(u32, offset, @divFloor(bytes, @sizeOf(u32)) * @sizeOf(u32));
 
     var i: usize = 0;
     while (bytes >= 4) : ({
diff --git a/src/soft/SoftCommandBuffer.zig b/src/soft/SoftCommandBuffer.zig
index 87456e3..934f392 100644
--- a/src/soft/SoftCommandBuffer.zig
+++ b/src/soft/SoftCommandBuffer.zig
@@ -85,6 +85,7 @@ pub fn create(device: *base.Device, allocator: std.mem.Allocator, info: *const v
         .setStencilReference = setStencilReference,
         .setStencilWriteMask = setStencilWriteMask,
         .setViewport = setViewport,
+        .updateBuffer = updateBuffer,
         .waitEvent = waitEvent,
     };
 
@@ -819,7 +820,7 @@ pub fn dispatchIndirect(interface: *Interface, buffer: *base.Buffer, offset: vk.
 
         pub fn execute(context: *anyopaque, device: *ExecutionDevice) VkError!void {
             const impl: *Impl = @ptrCast(@alignCast(context));
-            const command = try impl.buffer.mapAsWithOffset(vk.DispatchIndirectCommand, impl.offset);
+            const command = try impl.buffer.mapToWithAddedOffset(vk.DispatchIndirectCommand, impl.offset);
             try device.compute.dispatch(command.x, command.y, command.z);
         }
     };
@@ -908,7 +909,7 @@ pub fn drawIndexedIndirect(interface: *Interface, buffer: *base.Buffer, offset:
         pub fn execute(context: *anyopaque, device: *ExecutionDevice) VkError!void {
             const impl: *Impl = @ptrCast(@alignCast(context));
             for (0..impl.count) |index| {
-                const command = try impl.buffer.mapAsWithOffset(vk.DrawIndexedIndirectCommand, impl.offset + index * impl.stride);
+                const command = try impl.buffer.mapToWithAddedOffset(vk.DrawIndexedIndirectCommand, impl.offset + index * impl.stride);
                 try device.renderer.drawIndexed(command.index_count, command.instance_count, command.first_index, command.first_instance, command.vertex_offset);
             }
         }
@@ -940,7 +941,7 @@ pub fn drawIndirect(interface: *Interface, buffer: *base.Buffer, offset: usize,
         pub fn execute(context: *anyopaque, device: *ExecutionDevice) VkError!void {
             const impl: *Impl = @ptrCast(@alignCast(context));
             for (0..impl.count) |index| {
-                const command = try impl.buffer.mapAsWithOffset(vk.DrawIndirectCommand, impl.offset + index * impl.stride);
+                const command = try impl.buffer.mapToWithAddedOffset(vk.DrawIndirectCommand, impl.offset + index * impl.stride);
                 try device.renderer.draw(command.vertex_count, command.instance_count, command.first_vertex, command.first_instance);
             }
         }
@@ -1028,6 +1029,36 @@ pub fn fillBuffer(interface: *Interface, buffer: *base.Buffer, offset: vk.Device
     self.commands.append(allocator, .{ .ptr = cmd, .vtable = &.{ .execute = CommandImpl.execute } }) catch return VkError.OutOfHostMemory;
 }
 
+pub fn updateBuffer(interface: *Interface, buffer: *base.Buffer, offset: vk.DeviceSize, data: []const u8) VkError!void {
+    const self: *Self = @alignCast(@fieldParentPtr("interface", interface));
+    const allocator = self.command_allocator.allocator();
+
+    const CommandImpl = struct {
+        const Impl = @This();
+
+        buffer: *SoftBuffer,
+        offset: vk.DeviceSize,
+        data: []const u8,
+
+        pub fn execute(context: *anyopaque, _: *ExecutionDevice) VkError!void {
+            const impl: *Impl = @ptrCast(@alignCast(context));
+            const map = try impl.buffer.mapAsSliceWithAddedOffset(u8, impl.offset, impl.data.len);
+            @memcpy(map, impl.data);
+        }
+    };
+
+    const cmd = allocator.create(CommandImpl) catch return VkError.OutOfHostMemory;
+    errdefer allocator.destroy(cmd);
+
+    const data_copy = allocator.dupe(u8, data) catch return VkError.OutOfHostMemory;
+    cmd.* = .{
+        .buffer = @alignCast(@fieldParentPtr("interface", buffer)),
+        .offset = offset,
+        .data = data_copy,
+    };
+    self.commands.append(allocator, .{ .ptr = cmd, .vtable = &.{ .execute = CommandImpl.execute } }) catch return VkError.OutOfHostMemory;
+}
+
 pub fn nextSubpass(interface: *Interface, _: vk.SubpassContents) VkError!void {
     const self: *Self = @alignCast(@fieldParentPtr("interface", interface));
     const allocator = self.command_allocator.allocator();
diff --git a/src/soft/SoftQueue.zig b/src/soft/SoftQueue.zig
index 6d27283..1a60687 100644
--- a/src/soft/SoftQueue.zig
+++ b/src/soft/SoftQueue.zig
@@ -2,8 +2,6 @@ const std = @import("std");
 const vk = @import("vulkan");
 const base = @import("base");
 
-const RefCounter = base.RefCounter;
-
 const ExecutionDevice = @import("device/Device.zig");
 const Dispatchable = base.Dispatchable;
 
@@ -18,6 +16,18 @@ pub const Interface = base.Queue;
 
 interface: Interface,
 group: std.Io.Group,
+mutex: std.Io.Mutex,
+condition: std.Io.Condition,
+next_sequence: usize,
+executing_sequence: usize,
+
+const TaskData = struct {
+    queue: *Self,
+    soft_device: *SoftDevice,
+    sequence: usize,
+    infos: std.ArrayList(Interface.SubmitInfo),
+    fence: ?*base.Fence,
+};
 
 pub fn create(allocator: std.mem.Allocator, device: *base.Device, index: u32, family_index: u32, flags: vk.DeviceQueueCreateFlags) VkError!*Interface {
     const self = allocator.create(Self) catch return VkError.OutOfHostMemory;
@@ -34,6 +44,10 @@ pub fn create(allocator: std.mem.Allocator, device: *base.Device, index: u32, fa
     self.* = .{
         .interface = interface,
         .group = .init,
+        .mutex = .init,
+        .condition = .init,
+        .next_sequence = 0,
+        .executing_sequence = 0,
     };
     return &self.interface;
 }
@@ -54,22 +68,34 @@ pub fn bindSparse(interface: *Interface, info: []const vk.BindSparseInfo, fence:
 pub fn submit(interface: *Interface, infos: []Interface.SubmitInfo, p_fence: ?*base.Fence) VkError!void {
     const self: *Self = @alignCast(@fieldParentPtr("interface", interface));
     const soft_device: *SoftDevice = @alignCast(@fieldParentPtr("interface", interface.owner));
-
     const allocator = soft_device.device_allocator.allocator();
-    const io = soft_device.interface.io();
+    const io = interface.owner.io();
 
-    const runners_counter = allocator.create(RefCounter) catch return VkError.OutOfDeviceMemory;
-    errdefer allocator.destroy(runners_counter);
-    runners_counter.* = .init;
-    runners_counter.setRef(infos.len);
+    const task_data = allocator.create(TaskData) catch return VkError.OutOfDeviceMemory;
+    errdefer allocator.destroy(task_data);
 
-    for (infos) |info| {
-        // Cloning info to keep them alive until command execution ends
-        const cloned_info: Interface.SubmitInfo = .{
-            .command_buffers = info.command_buffers.clone(allocator) catch return VkError.OutOfDeviceMemory,
-        };
-        self.group.async(io, Self.taskRunner, .{ self, cloned_info, p_fence, runners_counter });
-    }
+    var cloned_infos = try cloneSubmitInfos(allocator, infos);
+    errdefer deinitSubmitInfos(allocator, &cloned_infos);
+
+    const sequence = blk: {
+        self.mutex.lock(io) catch return VkError.DeviceLost;
+        defer self.mutex.unlock(io);
+
+        const seq = self.next_sequence;
+        self.next_sequence += 1;
+
+        break :blk seq;
+    };
+
+    task_data.* = .{
+        .queue = self,
+        .soft_device = soft_device,
+        .sequence = sequence,
+        .infos = cloned_infos,
+        .fence = p_fence,
+    };
+
+    self.group.async(io, Self.taskRunner, .{task_data});
 }
 
 pub fn waitIdle(interface: *Interface) VkError!void {
@@ -78,20 +104,9 @@ pub fn waitIdle(interface: *Interface) VkError!void {
     self.group.await(io) catch return VkError.DeviceLost;
 }
 
-fn taskRunner(self: *Self, info: Interface.SubmitInfo, p_fence: ?*base.Fence, runners_counter: *RefCounter) void {
-    defer {
-        runners_counter.unref();
-        if (!runners_counter.hasRefs()) {
-            const soft_device: *SoftDevice = @alignCast(@fieldParentPtr("interface", self.interface.owner));
-            const allocator = soft_device.device_allocator.allocator();
-            allocator.destroy(runners_counter);
-        }
-    }
-
-    var soft_device: *SoftDevice = @alignCast(@fieldParentPtr("interface", self.interface.owner));
-    defer {
-        var command_buffers = info.command_buffers;
-        command_buffers.deinit(soft_device.device_allocator.allocator());
+fn executeSubmitInfo(soft_device: *SoftDevice, info: Interface.SubmitInfo) VkError!void {
+    for (info.wait_semaphores.items) |semaphore| {
+        try semaphore.wait();
     }
 
     var execution_device: ExecutionDevice = undefined;
@@ -103,9 +118,81 @@ fn taskRunner(self: *Self, info: Interface.SubmitInfo, p_fence: ?*base.Fence, ru
         soft_command_buffer.execute(&execution_device);
     }
 
-    if (p_fence) |fence| {
-        if (runners_counter.getRefsCount() == 1) {
-            fence.signal() catch {};
-        }
+    for (info.signal_semaphores.items) |semaphore| {
+        try semaphore.signal();
     }
 }
+
+fn taskRunner(data: *TaskData) void {
+    const io = data.queue.interface.owner.io();
+    const allocator = data.soft_device.device_allocator.allocator();
+    defer {
+        deinitSubmitInfos(allocator, &data.infos);
+        allocator.destroy(data);
+    }
+
+    {
+        data.queue.mutex.lock(io) catch return;
+        defer data.queue.mutex.unlock(io);
+
+        while (data.sequence != data.queue.executing_sequence) {
+            data.queue.condition.wait(io, &data.queue.mutex) catch return;
+        }
+    }
+
+    var submit_err: ?VkError = null;
+    for (data.infos.items) |info| {
+        executeSubmitInfo(data.soft_device, info) catch |err| {
+            submit_err = err;
+            break;
+        };
+    }
+
+    if (submit_err) |err| {
+        std.log.scoped(.SoftQueue).err("Queue submit failed with '{s}'", .{@errorName(err)});
+    }
+
+    if (data.fence) |fence| {
+        fence.signal() catch |err| {
+            std.log.scoped(.SoftQueue).err("Queue submit fence signal failed with '{s}'", .{@errorName(err)});
+        };
+    }
+
+    data.queue.mutex.lock(io) catch return;
+    data.queue.executing_sequence += 1;
+    data.queue.condition.broadcast(io);
+    data.queue.mutex.unlock(io);
+}
+
+fn cloneSubmitInfos(allocator: std.mem.Allocator, infos: []Interface.SubmitInfo) VkError!std.ArrayList(Interface.SubmitInfo) {
+    var cloned_infos = std.ArrayList(Interface.SubmitInfo).initCapacity(allocator, infos.len) catch return VkError.OutOfDeviceMemory;
+    errdefer deinitSubmitInfos(allocator, &cloned_infos);
+
+    for (infos) |info| {
+        var wait_semaphores = info.wait_semaphores.clone(allocator) catch return VkError.OutOfDeviceMemory;
+        errdefer wait_semaphores.deinit(allocator);
+
+        var command_buffers = info.command_buffers.clone(allocator) catch return VkError.OutOfDeviceMemory;
+        errdefer command_buffers.deinit(allocator);
+
+        var signal_semaphores = info.signal_semaphores.clone(allocator) catch return VkError.OutOfDeviceMemory;
+        errdefer signal_semaphores.deinit(allocator);
+
+        cloned_infos.append(allocator, .{
+            .wait_semaphores = wait_semaphores,
+            .command_buffers = command_buffers,
+            .signal_semaphores = signal_semaphores,
+        }) catch return VkError.OutOfDeviceMemory;
+    }
+
+    return cloned_infos;
+}
+
+fn deinitSubmitInfos(allocator: std.mem.Allocator, infos: *std.ArrayList(Interface.SubmitInfo)) void {
+    for (infos.items) |*info| {
+        info.wait_semaphores.deinit(allocator);
+        info.command_buffers.deinit(allocator);
+        info.signal_semaphores.deinit(allocator);
+    }
+    infos.deinit(allocator);
+}
diff --git a/src/soft/device/ComputeDispatcher.zig b/src/soft/device/ComputeDispatcher.zig
index 9c46e9b..abf6354 100644
--- a/src/soft/device/ComputeDispatcher.zig
+++ b/src/soft/device/ComputeDispatcher.zig
@@ -47,7 +47,8 @@ pub fn init(device: *SoftDevice, state: *PipelineState) Self {
 }
 
 pub fn dispatch(self: *Self, group_count_x: u32, group_count_y: u32, group_count_z: u32) VkError!void {
-    const group_count: usize = @intCast(group_count_x * group_count_y * group_count_z);
+    const group_count_xy = std.math.mul(usize, group_count_x, group_count_y) catch return VkError.ValidationFailed;
+    const group_count = std.math.mul(usize, group_count_xy, group_count_z) catch return VkError.ValidationFailed;
 
     const pipeline = self.state.pipeline orelse return VkError.InvalidPipelineDrv;
     const shader = pipeline.stages.getPtr(.compute) orelse return VkError.InvalidPipelineDrv;
diff --git a/src/vulkan/BinarySemaphore.zig b/src/vulkan/BinarySemaphore.zig
index 4a913bc..173f813 100644
--- a/src/vulkan/BinarySemaphore.zig
+++ b/src/vulkan/BinarySemaphore.zig
@@ -16,6 +16,8 @@ vtable: *const VTable,
 
 pub const VTable = struct {
     destroy: *const fn (*Self, std.mem.Allocator) void,
+    signal: *const fn (*Self) VkError!void,
+    wait: *const fn (*Self) VkError!void,
 };
 
 pub fn init(device: *Device, allocator: std.mem.Allocator, info: *const vk.SemaphoreCreateInfo) VkError!Self {
@@ -30,3 +32,11 @@ pub fn init(device: *Device, allocator: std.mem.Allocator, info: *const vk.Semap
 pub inline fn destroy(self: *Self, allocator: std.mem.Allocator) void {
     self.vtable.destroy(self, allocator);
 }
+
+pub inline fn signal(self: *Self) VkError!void {
+    try self.vtable.signal(self);
+}
+
+pub inline fn wait(self: *Self) VkError!void {
+    try self.vtable.wait(self);
+}
diff --git a/src/vulkan/CommandBuffer.zig b/src/vulkan/CommandBuffer.zig
index 43db33b..d9b1449 100644
--- a/src/vulkan/CommandBuffer.zig
+++ b/src/vulkan/CommandBuffer.zig
@@ -80,6 +80,7 @@ pub const DispatchTable = struct {
     setStencilReference: *const fn (*Self, vk.StencilFaceFlags, u32) VkError!void,
     setStencilWriteMask: *const fn (*Self, vk.StencilFaceFlags, u32) VkError!void,
     setViewport: *const fn (*Self, u32, []const vk.Viewport) VkError!void,
+    updateBuffer: *const fn (*Self, *Buffer, vk.DeviceSize, []const u8) VkError!void,
     waitEvent: *const fn (*Self, *Event, vk.PipelineStageFlags, vk.PipelineStageFlags, []const vk.MemoryBarrier, []const vk.BufferMemoryBarrier, []const vk.ImageMemoryBarrier) VkError!void,
 };
 
@@ -245,6 +246,10 @@ pub inline fn dispatchIndirect(self: *Self, buffer: *Buffer, offset: vk.DeviceSi
     try self.dispatch_table.dispatchIndirect(self, buffer, offset);
 }
 
+pub inline fn updateBuffer(self: *Self, buffer: *Buffer, offset: vk.DeviceSize, data: []const u8) VkError!void {
+    try self.dispatch_table.updateBuffer(self, buffer, offset, data);
+}
+
 pub inline fn draw(self: *Self, vertex_count: usize, instance_count: usize, first_vertex: usize, first_instance: usize) VkError!void {
     try self.dispatch_table.draw(self, vertex_count, instance_count, first_vertex, first_instance);
 }
diff --git a/src/vulkan/Queue.zig b/src/vulkan/Queue.zig
index 0da0517..11621f0 100644
--- a/src/vulkan/Queue.zig
+++ b/src/vulkan/Queue.zig
@@ -34,23 +34,43 @@ pub const DispatchTable = struct {
 };
 
 pub const SubmitInfo = struct {
+    wait_semaphores: std.ArrayList(*BinarySemaphore),
     command_buffers: std.ArrayList(*CommandBuffer),
+    signal_semaphores: std.ArrayList(*BinarySemaphore),
     // TODO: complete
 
     fn initBlob(allocator: std.mem.Allocator, infos: []const vk.SubmitInfo) VkError!std.ArrayList(SubmitInfo) {
         var self = std.ArrayList(SubmitInfo).initCapacity(allocator, infos.len) catch return VkError.OutOfHostMemory;
-        errdefer self.deinit(allocator);
+        errdefer deinitBlob(allocator, &self);
 
         loop: for (infos) |info| {
-            if (info.command_buffer_count == 0) continue :loop;
-            if (info.p_command_buffers == null) continue :loop;
+            if (info.wait_semaphore_count == 0 and info.command_buffer_count == 0 and info.signal_semaphore_count == 0) continue :loop;
 
             var submit_info: SubmitInfo = .{
+                .wait_semaphores = std.ArrayList(*BinarySemaphore).initCapacity(allocator, info.wait_semaphore_count) catch return VkError.OutOfHostMemory,
                 .command_buffers = std.ArrayList(*CommandBuffer).initCapacity(allocator, info.command_buffer_count) catch return VkError.OutOfHostMemory,
+                .signal_semaphores = std.ArrayList(*BinarySemaphore).initCapacity(allocator, info.signal_semaphore_count) catch return VkError.OutOfHostMemory,
             };
+            errdefer submit_info.wait_semaphores.deinit(allocator);
+            errdefer submit_info.command_buffers.deinit(allocator);
+            errdefer submit_info.signal_semaphores.deinit(allocator);
 
-            for (info.p_command_buffers.?[0..info.command_buffer_count]) |vk_command_buffer| {
-                submit_info.command_buffers.append(allocator, try Dispatchable(CommandBuffer).fromHandleObject(vk_command_buffer)) catch return VkError.OutOfHostMemory;
+            if (info.p_wait_semaphores) |p_wait_semaphores| {
+                for (p_wait_semaphores[0..info.wait_semaphore_count]) |p_semaphore| {
+                    submit_info.wait_semaphores.append(allocator, try NonDispatchable(BinarySemaphore).fromHandleObject(p_semaphore)) catch return VkError.OutOfHostMemory;
+                }
+            }
+
+            if (info.p_command_buffers) |p_command_buffers| {
+                for (p_command_buffers[0..info.command_buffer_count]) |vk_command_buffer| {
+                    submit_info.command_buffers.append(allocator, try Dispatchable(CommandBuffer).fromHandleObject(vk_command_buffer)) catch return VkError.OutOfHostMemory;
+                }
+            }
+
+            if (info.p_signal_semaphores) |p_signal_semaphores| {
+                for (p_signal_semaphores[0..info.signal_semaphore_count]) |p_semaphore| {
+                    submit_info.signal_semaphores.append(allocator, try NonDispatchable(BinarySemaphore).fromHandleObject(p_semaphore)) catch return VkError.OutOfHostMemory;
+                }
             }
 
             self.append(allocator, submit_info) catch return VkError.OutOfHostMemory;
@@ -60,7 +80,9 @@ pub const SubmitInfo = struct {
 
     fn deinitBlob(allocator: std.mem.Allocator, self: *std.ArrayList(SubmitInfo)) void {
         for (self.items) |*submit_info| {
+            submit_info.wait_semaphores.deinit(allocator);
             submit_info.command_buffers.deinit(allocator);
+            submit_info.signal_semaphores.deinit(allocator);
         }
         self.deinit(allocator);
     }
@@ -95,15 +117,21 @@ pub fn submit(self: *Self, infos: []const vk.SubmitInfo, p_fence: ?*Fence) VkErr
     var submit_infos = try SubmitInfo.initBlob(allocator, infos);
     defer SubmitInfo.deinitBlob(allocator, &submit_infos);
 
+    if (submit_infos.items.len == 0) {
+        if (p_fence) |fence| {
+            try fence.signal();
+        }
+        return;
+    }
+
     try self.dispatch_table.submit(self, submit_infos.items, p_fence);
 }
 
 pub fn presentKHR(_: *Self, info: *const vk.PresentInfoKHR) VkError!void {
     if (info.p_wait_semaphores) |p_wait_semaphores| {
-        for (p_wait_semaphores[0..], 0..info.wait_semaphore_count) |p_semaphore, _| {
+        for (p_wait_semaphores[0..info.wait_semaphore_count]) |p_semaphore| {
             const semaphore = try NonDispatchable(BinarySemaphore).fromHandleObject(p_semaphore);
-            // TODO: handle semaphores
-            _ = semaphore;
+            try semaphore.wait();
         }
     }
 
diff --git a/src/vulkan/lib.zig b/src/vulkan/lib.zig
index 12bee5f..384188a 100644
--- a/src/vulkan/lib.zig
+++ b/src/vulkan/lib.zig
@@ -52,7 +52,7 @@ pub const ShaderModule = @import("ShaderModule.zig");
 pub const SurfaceKHR = @import("wsi/SurfaceKHR.zig");
 pub const SwapchainKHR = @import("wsi/SwapchainKHR.zig");
 
-pub const VULKAN_VENDOR_ID = @typeInfo(vk.VendorId).@"enum".fields[@typeInfo(vk.VendorId).@"enum".fields.len - 1].value + 1;
+pub const VULKAN_VENDOR_ID = 0x10008;
 
 /// Default driver name
 pub const DRIVER_NAME = "Unnamed Ape Driver";
@@ -60,10 +60,10 @@ pub const DRIVER_NAME = "Unnamed Ape Driver";
 pub const VULKAN_VERSION = vk.makeApiVersion(0, 1, 0, 0);
 
 /// Maximum number of descriptor sets per pipeline
-pub const VULKAN_MAX_DESCRIPTOR_SETS = 4;
+pub const VULKAN_MAX_DESCRIPTOR_SETS = 8;
 
 /// The number of push constant ranges is effectively bounded
-/// by the number of possible shader stages.  Not the number of stages that can
+/// by the number of possible shader stages. Not the number of stages that can
 /// be compiled together (a pipeline layout can be used in multiple pipelnes
 /// wth different sets of shaders) but the total number of stage bits supported
 /// by the implementation. Currently, those are
@@ -73,15 +73,7 @@ pub const VULKAN_MAX_DESCRIPTOR_SETS = 4;
 /// - VK_SHADER_STAGE_GEOMETRY_BIT
 /// - VK_SHADER_STAGE_FRAGMENT_BIT
 /// - VK_SHADER_STAGE_COMPUTE_BIT
-/// - VK_SHADER_STAGE_RAYGEN_BIT_KHR
-/// - VK_SHADER_STAGE_ANY_HIT_BIT_KHR
-/// - VK_SHADER_STAGE_CLOSEST_HIT_BIT_KHR
-/// - VK_SHADER_STAGE_MISS_BIT_KHR
-/// - VK_SHADER_STAGE_INTERSECTION_BIT_KHR
-/// - VK_SHADER_STAGE_CALLABLE_BIT_KHR
-/// - VK_SHADER_STAGE_TASK_BIT_EXT
-/// - VK_SHADER_STAGE_MESH_BIT_EXT
-pub const VULKAN_MAX_PUSH_CONSTANT_RANGES = 14;
+pub const VULKAN_MAX_PUSH_CONSTANT_RANGES = 6;
 
 pub const std_options: std.Options = .{
     .log_level = .debug,
diff --git a/src/vulkan/lib_vulkan.zig b/src/vulkan/lib_vulkan.zig
index d879dce..795134a 100644
--- a/src/vulkan/lib_vulkan.zig
+++ b/src/vulkan/lib_vulkan.zig
@@ -2069,15 +2069,9 @@ pub export fn apeCmdUpdateBuffer(p_cmd: vk.CommandBuffer, p_buffer: vk.Buffer, o
     defer entryPointEndLogTrace();
 
     const cmd = Dispatchable(CommandBuffer).fromHandleObject(p_cmd) catch |err| return errorLogger(err);
-    const buffer = Dispatchable(Buffer).fromHandleObject(p_buffer) catch |err| return errorLogger(err);
-
-    notImplementedWarning();
-
-    _ = cmd;
-    _ = buffer;
-    _ = offset;
-    _ = size;
-    _ = data;
+    const buffer = NonDispatchable(Buffer).fromHandleObject(p_buffer) catch |err| return errorLogger(err);
+    const data_bytes: [*]const u8 = @ptrCast(data);
+    cmd.updateBuffer(buffer, offset, data_bytes[0..size]) catch |err| return errorLogger(err);
 }
 
 pub export fn apeCmdWaitEvents(