[PATCH] winevulkan: Fix vkEnumerateInstanceExtensionProperties() behavior when no Vulkan driver is present.

[Liam Middlebrook]

Signed-off-by: Liam Middlebrook <lmiddlebrook at nvidia.com>

On 8/14/20 3:43 PM, Brendan Shanks wrote:
> Signed-off-by: Brendan Shanks <bshanks at codeweavers.com>
> ---
> 
> This is compliant with the spec and matches the behavior of the
> official Vulkan loader after a recent change, see
> <https://github.com/KhronosGroup/Vulkan-Loader/pull/423>.
> 
>   dlls/winevulkan/vulkan.c | 5 ++++-
>   1 file changed, 4 insertions(+), 1 deletion(-)
> 
> diff --git a/dlls/winevulkan/vulkan.c b/dlls/winevulkan/vulkan.c
> index 1b359d22c8c..9f8e2451ad9 100644
> --- a/dlls/winevulkan/vulkan.c
> +++ b/dlls/winevulkan/vulkan.c
> @@ -793,7 +793,10 @@ VkResult WINAPI wine_vkEnumerateInstanceExtensionProperties(const char *layer_na
>   
>       wine_vk_init_once();
>       if (!vk_funcs)
> -        return VK_ERROR_INITIALIZATION_FAILED;
> +    {
> +        *count = 0;
> +        return VK_SUCCESS;
> +    }
>   
>       res = vk_funcs->p_vkEnumerateInstanceExtensionProperties(NULL, &num_host_properties, NULL);
>       if (res != VK_SUCCESS)
>