Revised: Update iOS build to support future standarization of FindVulkan.cmake (#1516)

* Update iOS build to support future standarization of FindVulkan.cmake

* Update to Vulkan SDK 1.4.341.1 for iOS CI builds to match project

Author: SRSaunders

.github/workflows/build.yml

@@ -187,9 +187,9 @@ jobs:
       - name: retrieve VulkanSDK
         if: steps.VulkanSDK.outputs.cache-hit != 'true'
         run: |
-          wget https://sdk.lunarg.com/sdk/download/1.4.304.1/mac/vulkansdk-macos-1.4.304.1.zip
-          unzip vulkansdk-macos-1.4.304.1.zip
-          sudo InstallVulkan-1.4.304.1.app/Contents/MacOS/InstallVulkan-1.4.304.1 --root ~/VulkanSDK --accept-licenses --default-answer --confirm-command install com.lunarg.vulkan.ios
+          wget https://sdk.lunarg.com/sdk/download/1.4.341.1/mac/vulkansdk-macos-1.4.341.1.zip
+          unzip vulkansdk-macos-1.4.341.1.zip
+          sudo vulkansdk-macOS-1.4.341.1.app/Contents/MacOS/vulkansdk-macOS-1.4.341.1 --root ~/VulkanSDK --accept-licenses --default-answer --confirm-command install com.lunarg.vulkan.ios
 
       - name: build_ios
         run: |

CMakeLists.txt

@@ -1,6 +1,6 @@
-# Copyright (c) 2020-2025, Arm Limited and Contributors
-# Copyright (c) 2024-2025, Mobica Limited
-# Copyright (c) 2024-2025, Sascha Willems
+# Copyright (c) 2020-2026, Arm Limited and Contributors
+# Copyright (c) 2024-2026, Mobica Limited
+# Copyright (c) 2024-2026, Sascha Willems
 #
 # SPDX-License-Identifier: Apache-2.0
 #
@@ -40,6 +40,11 @@ project(vulkan_samples)
 if(VKB_GENERATE_ANTORA_SITE)
     add_subdirectory(antora)
 else ()
+# On IOS we define CMAKE_FIND_ROOT_PATH to allow find_package(Vulkan) to locate the Vulkan frameworks for iOS
+if(IOS)
+	set(CMAKE_FIND_ROOT_PATH "$ENV{VULKAN_SDK}")
+endif()
+
 # search for Vulkan SDK
 find_package(Vulkan)
 

app/CMakeLists.txt

@@ -139,6 +139,7 @@ if(IOS)
     endif ()
     # Vulkan cache variables already defined by main project CMakeLists and updated on Apple platforms by global_options.cmake
     if(Vulkan_LIBRARY AND ${Vulkan_VERSION} VERSION_GREATER_EQUAL 1.3.278)
+        get_filename_component(Vulkan_Target_SDK "$ENV{VULKAN_SDK}/.." REALPATH)
         target_sources(${PROJECT_NAME} PRIVATE
                 ${Vulkan_Target_SDK}/iOS/share/vulkan
         )

bldsys/cmake/global_options.cmake

@@ -1,5 +1,5 @@
 #[[
- Copyright (c) 2019-2025, Arm Limited and Contributors
+ Copyright (c) 2019-2026, Arm Limited and Contributors
 
  SPDX-License-Identifier: Apache-2.0
 
@@ -78,10 +78,10 @@ if(APPLE)
 		else()
 			message(FATAL_ERROR "Can't find MoltenVK library. Please install the Vulkan SDK or MoltenVK project and set VULKAN_SDK.")
 		endif()
-	#elseif(OTHER_VULKAN_DRIVER)
-		# handle any special processing here for other Vulkan driver (e.g. KosmicKrisp) for standalone usage on macOS or deployment to iOS
-		# would likely require extensions to CMake find_package() OPTIONAL_COMPONENTS and library variables to identify & use other driver
-	#else()
+	elseif(IOS AND NOT Vulkan_Layer_VALIDATION)
+		# if building for iOS devices (not iOS Simulator as above) and Vulkan_Layer_VALIDATION is not defined or found, search in the Vulkan SDK
+		find_library(Vulkan_Layer_VALIDATION NAMES VkLayer_khronos_validation HINTS "$ENV{VULKAN_SDK}/lib")
+	else()
 		# if not using standalone driver, retain find_package() results for Vulkan driver, Vulkan loader, and Validation Layer library variables
 		# no need to override with _HPP_VULKAN_LIBRARY in this case since Vulkan DynamicLoader will find/load Vulkan library on macOS & iOS
 	endif()