jpbruyere / vk.net

Vulkan binding for .net

Auto-generated low level Vulkan bindings for .NET.

vk.net is designed to be used with vke.net to ease building vulkan applications in c#.

The nuget package is available under the name Vulkan.

Compiling Options:

-p:AutoSetSType=true

vk.net's Issues

Enum arrays are not blittable on windows.

Running vke on windows cause Unhandled exception when trying to allocate a GCHandle for enum arrays. This should be solve in future version of ms .net runtimes. But in current development version of ms runtime (5.0.0-dev), enum isn't already blittale.

vkEnumerateInstanceLayerProperties always gives AccessViolationException

So I will start by saying I'm not sure what I'm about to say is right but please stick with me.

This is the code I'm using to call the vkEnumerateInstanceLayerProperties

if (vkEnumerateInstanceLayerProperties(out var count, IntPtr.Zero) != VkResult.Success) return;
var sizeStruct = Marshal.SizeOf<VkLayerProperties>();
var ptrSupLayers = Marshal.AllocHGlobal(sizeStruct * (int) count);
if (vkEnumerateInstanceLayerProperties(out count, ptrSupLayers) != VkResult.Success) return;
var result = new string[count];
var tmp = ptrSupLayers;
for (var i = 0; i < count; i++) {
    result[i] = Marshal.PtrToStringAnsi(tmp);
    tmp += sizeStruct;
}
Marshal.FreeHGlobal(ptrSupLayers);

This is effectivally your code from VKE for vkEnumerateInstanceExtensionProperties but for Layers.

Looking at the generated code

[CalliRewrite]
public static unsafe VkResult vkEnumerateInstanceLayerProperties(out uint pPropertyCount, IntPtr pProperties)
{
    fixed (uint* numPtr = &pPropertyCount)
    {
        IntPtr num = pProperties;
        // ISSUE: cast to a function pointer type
        // ISSUE: function pointer call
        return __calli((__FnPtr<VkResult (uint*, IntPtr)>) Vk.vkEnumerateInstanceLayerProperties_ptr)((IntPtr) numPtr, (uint*) num);
    }
}

To my unaware of how such things work but learning mind this looks like things are the wrong cast in that

return __calli((__FnPtr<VkResult (uint*, IntPtr)>) Vk.vkEnumerateInstanceLayerProperties_ptr)((IntPtr) numPtr, (uint*) num);

should be

return __calli((__FnPtr<VkResult (uint*, IntPtr)>) Vk.vkEnumerateInstanceLayerProperties_ptr)((uint*) numPtr, (IntPtr) num);

But I'm happy to accept if I'm wrong please let me know

Crash on call to Vk.vkEnumeratePhysicalDevices

Hi, my code crashes when I try to use the Vk.vkEnumeratePhysicalDevices function.
Here is my code:

---

        VkInstance inst = CreateInstance();
        
        uint deviceCount = 0;
        Assert(Vk.vkEnumeratePhysicalDevices(inst, (IntPtr)(&deviceCount), IntPtr.Zero));

        VkPhysicalDevice[] physicalDevices = new VkPhysicalDevice[deviceCount];

        fixed (VkPhysicalDevice* devPtr = &physicalDevices[0])
        {
            Assert(Vk.vkEnumeratePhysicalDevices(inst, (IntPtr)(&deviceCount), (IntPtr)devPtr));
        }

        VkPhysicalDevice physicalDevice = _PickPhysicsDevice(physicalDevices, deviceCount);

---

Am I using the api the correct way? Or else why is it crashing inside of Vk.vkEnumeratePhysicalDevices?