feat: push constants + UBO descriptor sets — rotating triangle with VP matrix

- Push constants: rotation angle (float) sent to vertex shader via vkCmdPushConstants
- UBO + descriptor sets: VP matrix (mat4) in uniform buffer, bound via VkDescriptorSet
- New Vulkan functions: vkCreateDescriptorSetLayout, vkCreateDescriptorPool,
  vkAllocateDescriptorSets, vkUpdateDescriptorSets, vkCmdBindDescriptorSets,
  vkCmdPushConstants
- New structs: VkPushConstantRange, VkDescriptorSetLayoutBinding,
  VkDescriptorSetLayoutCreateInfo, VkDescriptorPoolCreateInfo,
  VkDescriptorPoolSize, VkDescriptorSetAllocateInfo, VkWriteDescriptorSet,
  VkDescriptorBufferInfo
- Per-frame UBO buffers (HOST_VISIBLE|HOST_COHERENT, 64 bytes each)
- Perspective projection + look-at camera (static, no ECS yet)
- Cleaned up debug logging in VulkanContext
- Zero validation errors

src/Engine.Graphics.Vulkan/Shaders/triangle.vert

@@ -6,7 +6,22 @@ layout(location = 2) in vec3 inNormal;
 
 layout(location = 0) out vec3 fragColor;
 
+layout(row_major, set = 0, binding = 0) uniform CameraUBO {
+    mat4 vp;
+};
+
+layout(push_constant) uniform PC {
+    float angle;
+} pc;
+
 void main() {
-    gl_Position = vec4(inPosition, 1.0);
+    float c = cos(pc.angle);
+    float s = sin(pc.angle);
+    vec3 rotated = vec3(
+        inPosition.x * c - inPosition.y * s,
+        inPosition.x * s + inPosition.y * c,
+        inPosition.z
+    );
+    gl_Position = vp * vec4(rotated, 1.0);
     fragColor = inColor;
 }

src/Engine.Graphics.Vulkan/Vk.cs

@@ -62,6 +62,14 @@ internal static unsafe class Vk
     public delegate void VkCmdEndRendering(VkCommandBuffer commandBuffer);
     public delegate void VkCmdPipelineBarrier2(VkCommandBuffer commandBuffer, VkDependencyInfo* pDependencyInfo);
     public delegate void VkCmdCopyBuffer(VkCommandBuffer commandBuffer, VkBuffer srcBuffer, VkBuffer dstBuffer, uint regionCount, VkBufferCopy* pRegions);
+    public delegate void VkCmdPushConstants(VkCommandBuffer commandBuffer, VkPipelineLayout layout, VkShaderStageFlags stageFlags, uint offset, uint size, void* pValues);
+    public delegate void VkCmdBindDescriptorSets(VkCommandBuffer commandBuffer, VkPipelineBindPoint pipelineBindPoint, VkPipelineLayout layout, uint firstSet, uint descriptorSetCount, VkDescriptorSet* pDescriptorSets, uint dynamicOffsetCount, uint* pDynamicOffsets);
+    public delegate VkResult VkCreateDescriptorSetLayout(VkDevice device, VkDescriptorSetLayoutCreateInfo* pCreateInfo, nint pAllocator, VkDescriptorSetLayout* pSetLayout);
+    public delegate void VkDestroyDescriptorSetLayout(VkDevice device, VkDescriptorSetLayout descriptorSetLayout, nint pAllocator);
+    public delegate VkResult VkCreateDescriptorPool(VkDevice device, VkDescriptorPoolCreateInfo* pCreateInfo, nint pAllocator, VkDescriptorPool* pDescriptorPool);
+    public delegate void VkDestroyDescriptorPool(VkDevice device, VkDescriptorPool descriptorPool, nint pAllocator);
+    public delegate VkResult VkAllocateDescriptorSets(VkDevice device, VkDescriptorSetAllocateInfo* pAllocateInfo, VkDescriptorSet* pDescriptorSets);
+    public delegate void VkUpdateDescriptorSets(VkDevice device, uint descriptorWriteCount, VkWriteDescriptorSet* pDescriptorWrites, uint descriptorCopyCount, nint pDescriptorCopies);
     public delegate VkResult VkAcquireNextImageKHR(VkDevice device, VkSwapchainKHR swapchain, ulong timeout, VkSemaphore semaphore, VkFence fence, uint* pImageIndex);
     public delegate VkResult VkQueueSubmit2(VkQueue queue, uint submitCount, VkSubmitInfo2* pSubmits, VkFence fence);
     public delegate VkResult VkQueuePresentKHR(VkQueue queue, VkPresentInfoKHR* pPresentInfo);
@@ -129,6 +137,14 @@ internal static unsafe class Vk
     public static VkCmdEndRendering vkCmdEndRendering;
     public static VkCmdPipelineBarrier2 vkCmdPipelineBarrier2;
     public static VkCmdCopyBuffer vkCmdCopyBuffer;
+    public static VkCmdPushConstants vkCmdPushConstants;
+    public static VkCmdBindDescriptorSets vkCmdBindDescriptorSets;
+    public static VkCreateDescriptorSetLayout vkCreateDescriptorSetLayout;
+    public static VkDestroyDescriptorSetLayout vkDestroyDescriptorSetLayout;
+    public static VkCreateDescriptorPool vkCreateDescriptorPool;
+    public static VkDestroyDescriptorPool vkDestroyDescriptorPool;
+    public static VkAllocateDescriptorSets vkAllocateDescriptorSets;
+    public static VkUpdateDescriptorSets vkUpdateDescriptorSets;
     public static VkAcquireNextImageKHR vkAcquireNextImageKHR;
     public static VkQueueSubmit2 vkQueueSubmit2;
     public static VkQueuePresentKHR vkQueuePresentKHR;
@@ -203,6 +219,14 @@ internal static unsafe class Vk
         vkCmdEndRendering = LoadDev<VkCmdEndRendering>(p, "vkCmdEndRendering");
         vkCmdPipelineBarrier2 = LoadDev<VkCmdPipelineBarrier2>(p, "vkCmdPipelineBarrier2");
         vkCmdCopyBuffer = LoadDev<VkCmdCopyBuffer>(p, "vkCmdCopyBuffer");
+        vkCmdPushConstants = LoadDev<VkCmdPushConstants>(p, "vkCmdPushConstants");
+        vkCmdBindDescriptorSets = LoadDev<VkCmdBindDescriptorSets>(p, "vkCmdBindDescriptorSets");
+        vkCreateDescriptorSetLayout = LoadDev<VkCreateDescriptorSetLayout>(p, "vkCreateDescriptorSetLayout");
+        vkDestroyDescriptorSetLayout = LoadDev<VkDestroyDescriptorSetLayout>(p, "vkDestroyDescriptorSetLayout");
+        vkCreateDescriptorPool = LoadDev<VkCreateDescriptorPool>(p, "vkCreateDescriptorPool");
+        vkDestroyDescriptorPool = LoadDev<VkDestroyDescriptorPool>(p, "vkDestroyDescriptorPool");
+        vkAllocateDescriptorSets = LoadDev<VkAllocateDescriptorSets>(p, "vkAllocateDescriptorSets");
+        vkUpdateDescriptorSets = LoadDev<VkUpdateDescriptorSets>(p, "vkUpdateDescriptorSets");
         vkAcquireNextImageKHR = LoadDev<VkAcquireNextImageKHR>(p, "vkAcquireNextImageKHR");
         vkQueueSubmit2 = LoadDev<VkQueueSubmit2>(p, "vkQueueSubmit2");
         vkQueuePresentKHR = LoadDev<VkQueuePresentKHR>(p, "vkQueuePresentKHR");

src/Engine.Graphics.Vulkan/VulkanContext.cs

@@ -241,12 +241,13 @@ internal sealed unsafe class VulkanContext : IDisposable
             var nameLen = Array.IndexOf(nameBytes, (byte)0);
             if (nameLen < 0) nameLen = 256;
             var devType = (VkPhysicalDeviceType)Marshal.ReadInt32((nint)propsBytes, 16);
-            Console.WriteLine($"[Vulkan] GPU {i}: {System.Text.Encoding.UTF8.GetString(nameBytes, 0, nameLen)} (type={devType})");
+            var gpuName = System.Text.Encoding.UTF8.GetString(nameBytes, 0, nameLen);
 
             if (best.Handle == 0 || (devType == VkPhysicalDeviceType.DiscreteGpu && bestType != VkPhysicalDeviceType.DiscreteGpu))
             {
                 best = devices[(int)i];
                 bestType = devType;
+                Console.WriteLine($"[Vulkan] Selected GPU: {gpuName} (type={devType})");
             }
         }
 
@@ -373,7 +374,6 @@ internal sealed unsafe class VulkanContext : IDisposable
             SurfaceColorSpace = formats[0].colorSpace;
         }
 
-        Console.WriteLine($"[Vulkan] Surface format: {SurfaceFormat}, color space: {SurfaceColorSpace}");
     }
 
     public uint FindMemoryType(uint memoryTypeBits, VkMemoryPropertyFlags desiredFlags)

src/Engine.Graphics.Vulkan/VulkanEnums.cs

@@ -39,6 +39,10 @@ public enum VkStructureType : int
     MemoryAllocateInfo = 5,
     BufferCreateInfo = 12,
     ShaderModuleCreateInfo = 16,
+    DescriptorSetLayoutCreateInfo = 32,
+    DescriptorPoolCreateInfo = 33,
+    DescriptorSetAllocateInfo = 34,
+    WriteDescriptorSet = 35,
     PipelineShaderStageCreateInfo = 18,
     PipelineVertexInputStateCreateInfo = 19,
     PipelineInputAssemblyStateCreateInfo = 20,

src/Engine.Graphics.Vulkan/VulkanFrameResources.cs

@@ -1,8 +1,11 @@
+using System.Runtime.InteropServices;
+
 namespace Engine.Graphics.Vulkan;
 
 internal sealed unsafe class VulkanFrameResources : IDisposable
 {
     public const int MaxFramesInFlight = 2;
+    public const ulong UboSize = 64;
 
     public VkCommandPool CommandPool;
     public VkCommandBuffer[] CommandBuffers = new VkCommandBuffer[MaxFramesInFlight];
@@ -10,10 +13,17 @@ internal sealed unsafe class VulkanFrameResources : IDisposable
     public VkSemaphore[] AcquireSemaphores = new VkSemaphore[MaxFramesInFlight];
     public VkSemaphore[] SubmitSemaphores = Array.Empty<VkSemaphore>();
 
+    public VkBuffer[] UboBuffers = new VkBuffer[MaxFramesInFlight];
+    public VkDeviceMemory[] UboMemories = new VkDeviceMemory[MaxFramesInFlight];
+    public VkDescriptorSet[] DescriptorSets = new VkDescriptorSet[MaxFramesInFlight];
+
+    public VkDescriptorPool DescriptorPool;
+
     private readonly VkDevice _device;
     private bool _disposed;
 
-    public VulkanFrameResources(VkDevice device, uint queueFamilyIndex, uint swapchainImageCount)
+    public VulkanFrameResources(VkDevice device, uint queueFamilyIndex, uint swapchainImageCount,
+        VulkanContext ctx, VkDescriptorSetLayout descriptorSetLayout)
     {
         _device = device;
 
@@ -24,12 +34,11 @@ internal sealed unsafe class VulkanFrameResources : IDisposable
             queueFamilyIndex = queueFamilyIndex,
         };
 
-        fixed (VkCommandPool* poolPtr = &CommandPool)
-        {
-            var result = Vk.vkCreateCommandPool(_device, &poolInfo, 0, poolPtr);
-            if (result != VkResult.Success)
-                throw new InvalidOperationException($"vkCreateCommandPool failed: {result}");
-        }
+        var cmdPool = VkCommandPool.Null;
+        var result = Vk.vkCreateCommandPool(_device, &poolInfo, 0, &cmdPool);
+        if (result != VkResult.Success)
+            throw new InvalidOperationException($"vkCreateCommandPool failed: {result}");
+        CommandPool = cmdPool;
 
         var allocInfo = new VkCommandBufferAllocateInfo
         {
@@ -41,7 +50,7 @@ internal sealed unsafe class VulkanFrameResources : IDisposable
 
         fixed (VkCommandBuffer* cmdPtr = CommandBuffers)
         {
-            var result = Vk.vkAllocateCommandBuffers(_device, &allocInfo, cmdPtr);
+            result = Vk.vkAllocateCommandBuffers(_device, &allocInfo, cmdPtr);
             if (result != VkResult.Success)
                 throw new InvalidOperationException($"vkAllocateCommandBuffers failed: {result}");
         }
@@ -60,7 +69,7 @@ internal sealed unsafe class VulkanFrameResources : IDisposable
         for (int i = 0; i < MaxFramesInFlight; i++)
         {
             var fence = VkFence.Null;
-            var result = Vk.vkCreateFence(_device, &fenceInfo, 0, &fence);
+            result = Vk.vkCreateFence(_device, &fenceInfo, 0, &fence);
             if (result != VkResult.Success)
                 throw new InvalidOperationException($"vkCreateFence failed: {result}");
             FrameFences[i] = fence;
@@ -76,15 +85,133 @@ internal sealed unsafe class VulkanFrameResources : IDisposable
         for (int i = 0; i < swapchainImageCount; i++)
         {
             var sem = VkSemaphore.Null;
-            var result = Vk.vkCreateSemaphore(_device, &semInfo, 0, &sem);
+            result = Vk.vkCreateSemaphore(_device, &semInfo, 0, &sem);
             if (result != VkResult.Success)
                 throw new InvalidOperationException($"vkCreateSemaphore (submit) failed: {result}");
             SubmitSemaphores[i] = sem;
         }
 
+        CreateUniformBuffers(ctx);
+        CreateDescriptorPoolAndSets(descriptorSetLayout);
+
         Console.WriteLine($"[Vulkan] Frame resources: {MaxFramesInFlight} frames in flight, {swapchainImageCount} submit semaphores");
     }
 
+    private void CreateUniformBuffers(VulkanContext ctx)
+    {
+        for (int i = 0; i < MaxFramesInFlight; i++)
+        {
+            var info = new VkBufferCreateInfo
+            {
+                sType = VkStructureType.BufferCreateInfo,
+                size = UboSize,
+                usage = VkBufferUsageFlags.UniformBuffer,
+                sharingMode = VkSharingMode.Exclusive,
+            };
+
+            var buf = VkBuffer.Null;
+            var result = Vk.vkCreateBuffer(_device, &info, 0, &buf);
+            if (result != VkResult.Success)
+                throw new InvalidOperationException($"vkCreateBuffer (UBO) failed: {result}");
+            UboBuffers[i] = buf;
+
+            var reqs = new VkMemoryRequirements();
+            Vk.vkGetBufferMemoryRequirements(_device, buf, &reqs);
+
+            var memTypeIndex = ctx.FindMemoryType(reqs.memoryTypeBits,
+                VkMemoryPropertyFlags.HostVisible | VkMemoryPropertyFlags.HostCoherent);
+
+            var allocInfo = new VkMemoryAllocateInfo
+            {
+                sType = VkStructureType.MemoryAllocateInfo,
+                allocationSize = reqs.size,
+                memoryTypeIndex = memTypeIndex,
+            };
+
+            var mem = VkDeviceMemory.Null;
+            result = Vk.vkAllocateMemory(_device, &allocInfo, 0, &mem);
+            if (result != VkResult.Success)
+                throw new InvalidOperationException($"vkAllocateMemory (UBO) failed: {result}");
+            UboMemories[i] = mem;
+
+            Vk.vkBindBufferMemory(_device, buf, mem, 0);
+        }
+    }
+
+    private void CreateDescriptorPoolAndSets(VkDescriptorSetLayout layout)
+    {
+        var poolSize = new VkDescriptorPoolSize
+        {
+            type = VkDescriptorType.UniformBuffer,
+            descriptorCount = MaxFramesInFlight,
+        };
+
+        var poolInfo = new VkDescriptorPoolCreateInfo
+        {
+            sType = VkStructureType.DescriptorPoolCreateInfo,
+            flags = VkDescriptorPoolCreateFlags.FreeDescriptorSet,
+            maxSets = MaxFramesInFlight,
+            poolSizeCount = 1,
+            pPoolSizes = &poolSize,
+        };
+
+        var descPool = VkDescriptorPool.Null;
+        var result = Vk.vkCreateDescriptorPool(_device, &poolInfo, 0, &descPool);
+        if (result != VkResult.Success)
+            throw new InvalidOperationException($"vkCreateDescriptorPool failed: {result}");
+        DescriptorPool = descPool;
+
+        var layouts = stackalloc VkDescriptorSetLayout[MaxFramesInFlight];
+        for (int i = 0; i < MaxFramesInFlight; i++)
+            layouts[i] = layout;
+
+        var allocInfo = new VkDescriptorSetAllocateInfo
+        {
+            sType = VkStructureType.DescriptorSetAllocateInfo,
+            descriptorPool = DescriptorPool,
+            descriptorSetCount = MaxFramesInFlight,
+            pSetLayouts = layouts,
+        };
+
+        fixed (VkDescriptorSet* setPtr = DescriptorSets)
+        {
+            result = Vk.vkAllocateDescriptorSets(_device, &allocInfo, setPtr);
+            if (result != VkResult.Success)
+                throw new InvalidOperationException($"vkAllocateDescriptorSets failed: {result}");
+        }
+
+        for (int i = 0; i < MaxFramesInFlight; i++)
+        {
+            var bufferInfo = new VkDescriptorBufferInfo
+            {
+                buffer = UboBuffers[i],
+                offset = 0,
+                range = UboSize,
+            };
+
+            var write = new VkWriteDescriptorSet
+            {
+                sType = VkStructureType.WriteDescriptorSet,
+                dstSet = DescriptorSets[i],
+                dstBinding = 0,
+                dstArrayElement = 0,
+                descriptorCount = 1,
+                descriptorType = VkDescriptorType.UniformBuffer,
+                pBufferInfo = &bufferInfo,
+            };
+
+            Vk.vkUpdateDescriptorSets(_device, 1, &write, 0, 0);
+        }
+    }
+
+    public void UpdateUbo(int frameIndex, void* data, ulong size)
+    {
+        void* pData = null;
+        Vk.vkMapMemory(_device, UboMemories[frameIndex], 0, size, 0, &pData);
+        System.Buffer.MemoryCopy(data, pData, (long)size, (long)size);
+        Vk.vkUnmapMemory(_device, UboMemories[frameIndex]);
+    }
+
     public void WaitFrame(int frameIndex)
     {
         fixed (VkFence* fencePtr = &FrameFences[frameIndex])
@@ -105,6 +232,8 @@ internal sealed unsafe class VulkanFrameResources : IDisposable
         {
             if (FrameFences[i].Handle != 0) Vk.vkDestroyFence(_device, FrameFences[i], 0);
             if (AcquireSemaphores[i].Handle != 0) Vk.vkDestroySemaphore(_device, AcquireSemaphores[i], 0);
+            if (UboBuffers[i].Handle != 0) Vk.vkDestroyBuffer(_device, UboBuffers[i], 0);
+            if (UboMemories[i].Handle != 0) Vk.vkFreeMemory(_device, UboMemories[i], 0);
         }
 
         for (int i = 0; i < SubmitSemaphores.Length; i++)
@@ -112,6 +241,7 @@ internal sealed unsafe class VulkanFrameResources : IDisposable
             if (SubmitSemaphores[i].Handle != 0) Vk.vkDestroySemaphore(_device, SubmitSemaphores[i], 0);
         }
 
+        if (DescriptorPool.Handle != 0) Vk.vkDestroyDescriptorPool(_device, DescriptorPool, 0);
         if (CommandPool.Handle != 0) Vk.vkDestroyCommandPool(_device, CommandPool, 0);
     }
 }

src/Engine.Graphics.Vulkan/VulkanPipeline.cs

@@ -9,6 +9,7 @@ internal sealed unsafe class VulkanPipeline : IDisposable
     public VkPipeline Pipeline;
     public VkShaderModule VertModule;
     public VkShaderModule FragModule;
+    public VkDescriptorSetLayout DescriptorSetLayout;
 
     private readonly VkDevice _device;
     private bool _disposed;
@@ -19,6 +20,8 @@ internal sealed unsafe class VulkanPipeline : IDisposable
         VertModule = CreateShaderModule(vertSpv);
         FragModule = CreateShaderModule(fragSpv);
 
+        CreateDescriptorSetLayout();
+
         fixed (byte* pName = "main\0"u8)
         {
             var stages = stackalloc VkPipelineShaderStageCreateInfo[2];
@@ -137,11 +140,21 @@ internal sealed unsafe class VulkanPipeline : IDisposable
                 pDynamicStates = dynamicStates,
             };
 
+            var pushConstantRange = new VkPushConstantRange
+            {
+                stageFlags = VkShaderStageFlags.Vertex,
+                offset = 0,
+                size = 4,
+            };
+
+            var descLayout = DescriptorSetLayout;
             var layoutInfo = new VkPipelineLayoutCreateInfo
             {
                 sType = VkStructureType.PipelineLayoutCreateInfo,
-                setLayoutCount = 0,
-                pushConstantRangeCount = 0,
+                setLayoutCount = 1,
+                pSetLayouts = &descLayout,
+                pushConstantRangeCount = 1,
+                pPushConstantRanges = (nint)(&pushConstantRange),
             };
 
             fixed (VkPipelineLayout* layoutPtr = &PipelineLayout)
@@ -187,6 +200,30 @@ internal sealed unsafe class VulkanPipeline : IDisposable
         Console.WriteLine("[Vulkan] Graphics pipeline created (dynamic rendering)");
     }
 
+    private void CreateDescriptorSetLayout()
+    {
+        var binding = new VkDescriptorSetLayoutBinding
+        {
+            binding = 0,
+            descriptorType = VkDescriptorType.UniformBuffer,
+            descriptorCount = 1,
+            stageFlags = VkShaderStageFlags.Vertex,
+        };
+
+        var info = new VkDescriptorSetLayoutCreateInfo
+        {
+            sType = VkStructureType.DescriptorSetLayoutCreateInfo,
+            bindingCount = 1,
+            pBindings = &binding,
+        };
+
+        var descLayout = VkDescriptorSetLayout.Null;
+        var result = Vk.vkCreateDescriptorSetLayout(_device, &info, 0, &descLayout);
+        if (result != VkResult.Success)
+            throw new InvalidOperationException($"vkCreateDescriptorSetLayout failed: {result}");
+        DescriptorSetLayout = descLayout;
+    }
+
     private VkShaderModule CreateShaderModule(byte[] spv)
     {
         fixed (byte* pCode = spv)
@@ -213,6 +250,7 @@ internal sealed unsafe class VulkanPipeline : IDisposable
 
         if (Pipeline.Handle != 0) Vk.vkDestroyPipeline(_device, Pipeline, 0);
         if (PipelineLayout.Handle != 0) Vk.vkDestroyPipelineLayout(_device, PipelineLayout, 0);
+        if (DescriptorSetLayout.Handle != 0) Vk.vkDestroyDescriptorSetLayout(_device, DescriptorSetLayout, 0);
         if (FragModule.Handle != 0) Vk.vkDestroyShaderModule(_device, FragModule, 0);
         if (VertModule.Handle != 0) Vk.vkDestroyShaderModule(_device, VertModule, 0);
     }

src/Engine.Graphics.Vulkan/VulkanRenderer.cs

@@ -18,6 +18,7 @@ internal sealed unsafe class VulkanRenderer : IRenderer, Engine.Graphics.IScreen
     private bool _disposed;
     private bool _screenshotRequested;
     private string? _screenshotPath;
+    private float _totalTime;
 
     public bool IsScreenshotRequested => _screenshotRequested;
     public IScreenshotProvider ScreenshotProvider => this;
@@ -32,7 +33,8 @@ internal sealed unsafe class VulkanRenderer : IRenderer, Engine.Graphics.IScreen
 
         _pipeline = new VulkanPipeline(ctx.Device, swapchain.Format, vertSpv, fragSpv);
 
-        _frameResources = new VulkanFrameResources(ctx.Device, ctx.GraphicsQueueFamilyIndex, swapchain.ImageCount);
+        _frameResources = new VulkanFrameResources(ctx.Device, ctx.GraphicsQueueFamilyIndex,
+            swapchain.ImageCount, ctx, _pipeline.DescriptorSetLayout);
 
         var vertices = new Vertex[]
         {
@@ -69,6 +71,11 @@ internal sealed unsafe class VulkanRenderer : IRenderer, Engine.Graphics.IScreen
         if (acquireResult != VkResult.Success)
             throw new InvalidOperationException($"vkAcquireNextImageKHR failed: {acquireResult}");
 
+        _totalTime += 0.016f;
+
+        var vp = ComputeViewProjection();
+        _frameResources.UpdateUbo(_frameIndex, &vp, VulkanFrameResources.UboSize);
+
         var cmd = _frameResources.CommandBuffers[_frameIndex];
         Vk.vkResetCommandBuffer(cmd, 0);
 
@@ -132,10 +139,17 @@ internal sealed unsafe class VulkanRenderer : IRenderer, Engine.Graphics.IScreen
         };
         Vk.vkCmdSetScissor(cmd, 0, 1, &scissor);
 
+        var descSet = _frameResources.DescriptorSets[_frameIndex];
+        Vk.vkCmdBindDescriptorSets(cmd, VkPipelineBindPoint.Graphics, _pipeline.PipelineLayout,
+            0, 1, &descSet, 0, null);
+
         var bufferHandle = _vertexBuffer.Buffer;
         ulong offset = 0;
         Vk.vkCmdBindVertexBuffers(cmd, 0, 1, &bufferHandle, &offset);
 
+        var angle = _totalTime;
+        Vk.vkCmdPushConstants(cmd, _pipeline.PipelineLayout, VkShaderStageFlags.Vertex, 0, 4, &angle);
+
         Vk.vkCmdDraw(cmd, 3, 1, 0, 0);
 
         Vk.vkCmdEndRendering(cmd);
@@ -207,6 +221,14 @@ internal sealed unsafe class VulkanRenderer : IRenderer, Engine.Graphics.IScreen
         _frameIndex = (_frameIndex + 1) % VulkanFrameResources.MaxFramesInFlight;
     }
 
+    private Matrix4x4 ComputeViewProjection()
+    {
+        var aspect = (float)_swapchain.Extent.Width / (float)_swapchain.Extent.Height;
+        var proj = Matrix4x4.CreatePerspectiveFieldOfView(MathF.PI / 4f, aspect, 0.1f, 100f);
+        var view = Matrix4x4.CreateLookAt(new Vector3(0, 0, -2), Vector3.Zero, Vector3.UnitY);
+        return view * proj;
+    }
+
     private static void TransitionImageLayout(VkCommandBuffer cmd, VkImage image,
         VkImageLayout oldLayout, VkImageLayout newLayout,
         ulong srcStage, ulong srcAccess,

src/Engine.Graphics.Vulkan/VulkanStructs.cs

@@ -907,3 +907,82 @@ public unsafe struct VkDebugUtilsMessengerCallbackDataEXT
     public uint objectCount;
     public nint pObjects;
 }
+
+[StructLayout(LayoutKind.Sequential)]
+public unsafe struct VkPushConstantRange
+{
+    public VkShaderStageFlags stageFlags;
+    public uint offset;
+    public uint size;
+}
+
+[StructLayout(LayoutKind.Sequential)]
+public unsafe struct VkDescriptorSetLayoutBinding
+{
+    public uint binding;
+    public VkDescriptorType descriptorType;
+    public uint descriptorCount;
+    public VkShaderStageFlags stageFlags;
+    public nint pImmutableSamplers;
+}
+
+[StructLayout(LayoutKind.Sequential)]
+public unsafe struct VkDescriptorSetLayoutCreateInfo
+{
+    public VkStructureType sType;
+    public nint pNext;
+    public uint flags;
+    public uint bindingCount;
+    public VkDescriptorSetLayoutBinding* pBindings;
+}
+
+[StructLayout(LayoutKind.Sequential)]
+public unsafe struct VkDescriptorPoolSize
+{
+    public VkDescriptorType type;
+    public uint descriptorCount;
+}
+
+[StructLayout(LayoutKind.Sequential)]
+public unsafe struct VkDescriptorPoolCreateInfo
+{
+    public VkStructureType sType;
+    public nint pNext;
+    public VkDescriptorPoolCreateFlags flags;
+    public uint maxSets;
+    public uint poolSizeCount;
+    public VkDescriptorPoolSize* pPoolSizes;
+}
+
+[StructLayout(LayoutKind.Sequential)]
+public unsafe struct VkDescriptorSetAllocateInfo
+{
+    public VkStructureType sType;
+    public nint pNext;
+    public VkDescriptorPool descriptorPool;
+    public uint descriptorSetCount;
+    public VkDescriptorSetLayout* pSetLayouts;
+}
+
+[StructLayout(LayoutKind.Sequential)]
+public unsafe struct VkDescriptorBufferInfo
+{
+    public VkBuffer buffer;
+    public ulong offset;
+    public ulong range;
+}
+
+[StructLayout(LayoutKind.Sequential)]
+public unsafe struct VkWriteDescriptorSet
+{
+    public VkStructureType sType;
+    public nint pNext;
+    public VkDescriptorSet dstSet;
+    public uint dstBinding;
+    public uint dstArrayElement;
+    public uint descriptorCount;
+    public VkDescriptorType descriptorType;
+    public nint pImageInfo;
+    public VkDescriptorBufferInfo* pBufferInfo;
+    public nint pTexelBufferView;
+}