Vulkan: Remove MoltenVK

Blender had some support for using MoltenVK. However there are some key
issues why MotlenVK cannot be used. Bugs have been reported up-stream.
As it doesn't work and holds back regular developments it will be removed
from the main branch.

Any efforts on making Vulkan run on Apple (including KosmicKrisp)
is considered a community effort and can be done in a development
branch.

Pull Request: https://projects.blender.org/blender/blender/pulls/144602

intern/ghost/CMakeLists.txt

@@ -90,16 +90,6 @@ if(WITH_OPENGL_BACKEND)
 endif()
 
 if(WITH_VULKAN_BACKEND)
-  if(WITH_VULKAN_MOLTENVK)
-    list(APPEND INC_SYS
-      PUBLIC ${MOLTENVK_INCLUDE_DIRS}
-    )
-
-    list(APPEND LIB
-      ${MOLTENVK_LIBRARIES}
-    )
-  endif()
-
   list(APPEND SRC
     intern/GHOST_ContextVK.cc
 

intern/ghost/GHOST_Types.h

@@ -12,11 +12,7 @@
 #include <string>
 
 #ifdef WITH_VULKAN_BACKEND
-#  ifdef __APPLE__
-#    include <MoltenVK/vk_mvk_moltenvk.h>
-#  else
-#    include <vulkan/vulkan_core.h>
-#  endif
+#  include <vulkan/vulkan_core.h>
 #endif
 
 /* This is used by `GHOST_C-api.h` too, cannot use C++ conventions. */

intern/ghost/intern/GHOST_ContextVK.cc

@@ -10,8 +10,6 @@
 
 #ifdef _WIN32
 #  include <vulkan/vulkan_win32.h>
-#elif defined(__APPLE__)
-#  include <MoltenVK/vk_mvk_moltenvk.h>
 #else /* X11/WAYLAND. */
 #  ifdef WITH_GHOST_X11
 #    include <vulkan/vulkan_xlib.h>
@@ -279,11 +277,8 @@ class GHOST_DeviceVK {
     queue_create_infos.push_back(graphic_queue_create_info);
 
     VkPhysicalDeviceFeatures device_features = {};
-#ifndef __APPLE__
     device_features.geometryShader = VK_TRUE;
-    /* MoltenVK supports logicOp, needs to be build with MVK_USE_METAL_PRIVATE_API. */
     device_features.logicOp = VK_TRUE;
-#endif
     device_features.dualSrcBlend = VK_TRUE;
     device_features.imageCubeArray = VK_TRUE;
     device_features.multiDrawIndirect = VK_TRUE;