macOS: Experimental Vulkan support via MoltenVK

Add support for QSurface::VulkanSurface and QVulkanWindow.

Usage:
  1) Build MoltenVK according to instructions
  2) Configure Qt: ./configure -I /path/to/MoltenVK/Package/Release/MoltenVK/include
  3) export QT_VULKAN_LIB=/path/to/MoltenVK/Package/Release/MoltenVK/macOS/libMoltenVK.

Implement support for QSurface::VulkanSurface by enabling
layer mode for QNSView and then creating a CAMetalLayer,
which the MoltenVK translation layer can run on.

MoltenVK provides an implementation of the Vulcan API,
which means that the platform integration is similar
to other platforms: implement a QCocoaVulkanInstance
where we pass the QNSView instance to the vkCreateMacOSSurfaceMVK
Vulkan surface constructor function.

Using Vulkan directly without QVulkanWindow is possible, but not
tested.

We currently load libMoltenVK at run-time and use the
existing QT_VULKAN_LIB environment variable to set its
path. For deployment purposes it would be better to
link against MoltenVK.frameworkm, but this

Task-number: QTBUG-66966
Change-Id: I04ec6289c40b199dca9fed32902b5d2ad4e9c030
Reviewed-by: Morten Johan Sørvig <morten.sorvig@qt.io>

1 files changed, 7 insertions, 1 deletions

diff --git a/src/plugins/platforms/cocoa/cocoa.pro b/src/plugins/platforms/cocoa/cocoa.pro
index 072012dee1..fd6dae8107 100644
--- a/src/plugins/platforms/cocoa/cocoa.pro
+++ b/src/plugins/platforms/cocoa/cocoa.pro
@@ -72,10 +72,14 @@ HEADERS += qcocoaintegration.h \
 
 qtConfig(opengl.*) {
     SOURCES += qcocoaglcontext.mm
-
     HEADERS += qcocoaglcontext.h
 }
 
+qtConfig(vulkan) {
+    SOURCES += qcocoavulkaninstance.mm
+    HEADERS += qcocoavulkaninstance.h
+}
+
 RESOURCES += qcocoaresources.qrc
 
 LIBS += -framework AppKit -framework CoreServices -framework Carbon -framework IOKit -framework QuartzCore -framework Metal -lcups
@@ -85,6 +89,8 @@ QT += \
     accessibility_support-private clipboard_support-private theme_support-private \
     fontdatabase_support-private graphics_support-private
 
+qtConfig(vulkan): QT += vulkan_support-private
+
 CONFIG += no_app_extension_api_only
 
 qtHaveModule(widgets) {