/// <summary>
/// Returns global extension properties.
/// </summary>
/// <param name="layerName">
/// Is either <c>null</c> or a unicode string naming the layer to retrieve extensions from.
/// When parameter is <c>null</c>, only extensions provided by the Vulkan implementation or
/// by implicitly enabled layers are returned.
/// </param>
/// <returns>Properties of available extensions for layer.</returns>
/// <exception cref="VulkanException">Vulkan returns an error code.</exception>
public static ExtensionProperties[] EnumerateExtensionProperties(string layerName = null)
{
int dstLayerNameByteCount = Interop.String.GetMaxByteCount(layerName);
var dstLayerNamePtr = stackalloc byte[dstLayerNameByteCount];
Interop.String.ToPointer(layerName, dstLayerNamePtr, dstLayerNameByteCount);
int count;
Result result = vkEnumerateInstanceExtensionProperties(dstLayerNamePtr, &count, null);
VulkanException.ThrowForInvalidResult(result);
var propertiesPtr = stackalloc ExtensionProperties.Native[count];
result = vkEnumerateInstanceExtensionProperties(dstLayerNamePtr, &count, propertiesPtr);
VulkanException.ThrowForInvalidResult(result);
var properties = new ExtensionProperties[count];
for (int i = 0; i < count; i++)
{
ExtensionProperties.FromNative(ref propertiesPtr[i], out properties[i]);
}
return(properties);
}
internal static void FromNative(ref Native native, out ExtensionProperties managed)
{
fixed(byte *extensionNamePtr = native.ExtensionName)
{
managed = new ExtensionProperties
{
ExtensionName = Interop.String.FromPointer(extensionNamePtr),
SpecVersion = native.SpecVersion
};
}
}
