package/qt5base: add vulkan option

Notes:
  - eglfs/vulkan is only implemented for eglfs_viv
    (see stub implementation for QEglFSDeviceIntegration::createPlatformVulkanInstance()
    in src/plugins/platforms/eglfs/api/qeglfsdeviceintegration.cpp and
    real implementation for QEglFSVivIntegration::createPlatformVulkanInstance()
    in src/plugins/platforms/eglfs/deviceintegration/eglfs_viv/qeglfsvivintegration.cpp)
  - or for xcb (see QXcbIntegration::createPlatformVulkanInstance()
    in src/plugins/platforms/xcb/qxcbintegration.cpp)
Signed-off-by: Adam Duskett <aduskett@gmail.com>
Signed-off-by: Thomas Petazzoni <thomas.petazzoni@bootlin.com>

package/qt5/qt5base/Config.in

@@ -180,6 +180,16 @@ config BR2_PACKAGE_QT5BASE_OPENGL_LIB
 
 endif
 
+config BR2_PACKAGE_QT5BASE_VULKAN
+	bool "Vulkan support"
+	depends on BR2_INSTALL_LIBSTDCPP # vulkan-loader
+	depends on !BR2_STATIC_LIBS # vulkan-loader
+	depends on BR2_TOOLCHAIN_HAS_THREADS # vulkan-loader
+	select BR2_PACKAGE_VULKAN_HEADERS
+	select BR2_PACKAGE_VULKAN_LOADER
+	help
+	  This option enables Vulkan support.
+
 config BR2_PACKAGE_QT5BASE_LINUXFB
 	bool "linuxfb support"
 

package/qt5/qt5base/qt5base.mk

@@ -206,6 +206,13 @@ else
 QT5BASE_CONFIGURE_OPTS += -no-opengl
 endif
 
+ifeq ($(BR2_PACKAGE_QT5BASE_VULKAN),y)
+QT5BASE_CONFIGURE_OPTS += -feature-vulkan
+QT5BASE_DEPENDENCIES   += vulkan-headers vulkan-loader
+else
+QT5BASE_CONFIGURE_OPTS += -no-feature-vulkan
+endif
+
 QT5BASE_DEFAULT_QPA = $(call qstrip,$(BR2_PACKAGE_QT5BASE_DEFAULT_QPA))
 QT5BASE_CONFIGURE_OPTS += $(if $(QT5BASE_DEFAULT_QPA),-qpa $(QT5BASE_DEFAULT_QPA))