[PATCH 6/7] winevulkan: Allow vkGetDeviceProcAddr to load instance functions for broken games.

[Roderick Colenbrander]

Doom and Wolfenstein II use vkGetDeviceProcAddr to load all their function pointers,
while they are supposed to use vkGetInstanceProcAddr for the instance ones.
For now we need to allow this broken behavior.

Signed-off-by: Roderick Colenbrander <thunderbird2k at gmail.com>
---
 dlls/winevulkan/vulkan.c | 19 +++++++++++++++++++
 1 file changed, 19 insertions(+)

diff --git a/dlls/winevulkan/vulkan.c b/dlls/winevulkan/vulkan.c
index c0fc810a14..202761a1c6 100644
--- a/dlls/winevulkan/vulkan.c
+++ b/dlls/winevulkan/vulkan.c
@@ -902,6 +902,25 @@ PFN_vkVoidFunction WINAPI wine_vkGetDeviceProcAddr(VkDevice device, const char *
     if (func)
         return func;
 
+    /* vkGetDeviceProcAddr was intended for loading device and subdevice functions.
+     * idTech 6 titles such as Doom and Wolfenstein II, however use it also for
+     * loading of instance functions. This is undefined behavior as the specification
+     * disallows using any of the returned function pointers outside of device /
+     * subdevice objects. The games don't actually use the function pointers and if they
+     * did, they would crash as VkInstance / VkPhysicalDevice parameters need unwrapping.
+     * Khronos clarified behavior in the Vulkan spec and expects drivers to get updated,
+     * however it would require both driver and game fixes. Since it are major titles
+     * it is not clear what will happen. At least for now we need the hack below.
+     * https://github.com/KhronosGroup/Vulkan-LoaderAndValidationLayers/issues/2323
+     * https://github.com/KhronosGroup/Vulkan-Docs/issues/655
+     */
+    func = wine_vk_get_instance_proc_addr(name);
+    if (func)
+    {
+        WARN("Application relies on undefined behavior by requesting instance function '%s'!\n", name);
+        return func;
+    }
+
     TRACE("Function %s not found\n", debugstr_a(name));
     return NULL;
 }
-- 
2.14.3