From f83a56b17f010785164ecbaaee8f90c74526848c Mon Sep 17 00:00:00 2001
From: GeorgH93 <git@georgh93.eu>
Date: Mon, 27 Nov 2023 09:22:11 +0100
Subject: [PATCH] Add FindMoltenVK module

---
 cmake/SetupVulkan.cmake                       | 13 +---
 cmake/modules/FindMoltenVK.cmake              | 76 +++++++++++++++++++
 examples/main.cpp                             |  1 -
 .../Host/iOS/OpenVulkanoViewController.mm     |  3 +-
 4 files changed, 79 insertions(+), 14 deletions(-)
 create mode 100644 cmake/modules/FindMoltenVK.cmake

diff --git a/cmake/SetupVulkan.cmake b/cmake/SetupVulkan.cmake
index fc8132c..a880584 100644
--- a/cmake/SetupVulkan.cmake
+++ b/cmake/SetupVulkan.cmake
@@ -1,16 +1,7 @@
 function(SetupVulkan TARGET)
     if (APPLE)
-        # Try to find xcframework of MoltenVK
-        cmake_path(SET MoltenVK_path NORMALIZE "$ENV{VULKAN_SDK}/../MoltenVK/")
-        cmake_path(SET MoltenVK_XC_path NORMALIZE "$ENV{VULKAN_SDK}/../MoltenVK/MoltenVK.xcframework")
-        if (EXISTS "${MoltenVK_path}" AND EXISTS "${MoltenVK_XC_path}")
-            if (EXISTS "${MoltenVK_path}/include")
-                set(Vulkan_INCLUDE_DIR "${MoltenVK_path}/include")
-            endif()
-
-            target_link_libraries(MadVoxel_Scan PRIVATE "${MoltenVK_XC_path}/ios-arm64/libMoltenVK.a")
-            message("Found MoltenVK xcframework: ${MoltenVK_XC_path}")
-        endif()
+        find_package(MoltenVK REQUIRED)
+        target_link_libraries(${TARGET} PRIVATE ${MoltenVK_LIBRARIES})
     else ()
         find_package(Vulkan REQUIRED)
         target_link_libraries(${TARGET} PRIVATE Vulkan::Vulkan)
diff --git a/cmake/modules/FindMoltenVK.cmake b/cmake/modules/FindMoltenVK.cmake
new file mode 100644
index 0000000..ae0ad70
--- /dev/null
+++ b/cmake/modules/FindMoltenVK.cmake
@@ -0,0 +1,76 @@
+cmake_minimum_required(VERSION 3.28 FATAL_ERROR)
+
+if (NOT APPLE)
+    message(STATUS "MoltenVK is only available on Apple platforms")
+    return()
+endif ()
+
+option(MOLTENVK_USE_STATIC "Prefer static linked MoltenVK over dynamic linked version" ON)
+option(MOLTENVK_DOWNLOAD "Use FetchContent to download MoltenVK if it failed to find a MoltenVK/Vulkan SDK install" ON)
+
+# Check if environment variable MOLTENVK_SDK is set
+if (NOT DEFINED ENV{MOLTENVK_SDK} AND DEFINED ENV{VULKAN_SDK})
+    message(STATUS "Checking for MoltenVK in Vulkan_SDK path")
+    cmake_path(SET MoltenVK_path NORMALIZE "$ENV{VULKAN_SDK}/../MoltenVK/")
+elseif (DEFINED ENV{MOLTENVK_SDK})
+    cmake_path(SET MoltenVK_path NORMALIZE "$ENV{MOLTENVK_SDK}/")
+endif ()
+if (NOT IS_DIRECTORY ${MoltenVK_path})
+    message(STATUS "${MoltenVK_path} does not exist!")
+    set(MoltenVK_path)
+endif ()
+if (MOLTENVK_DOWNLOAD AND NOT DEFINED MoltenVK_path)
+    message(STATUS "Downloading MoltenVK")
+    include(FetchContent)
+    FetchContent_Declare(MoltenVK_ALL
+                         URL_HASH SHA256=4252fdd71d511b47a12bc859fe3a9f43e20e77006e5d7eeb9c3732447de1b7b5
+                         URL https://github.com/KhronosGroup/MoltenVK/releases/download/v1.2.6/MoltenVK-all.tar
+    )
+    FetchContent_MakeAvailable(MoltenVK_ALL)
+    set(MoltenVK_path "${MoltenVK_ALL-SOURCE_DIR}/MoltenVK/")
+endif ()
+
+if (NOT DEFINED MoltenVK_path)
+    message(WARNING "Unable to find path to MoltenVK!")
+elseif (IS_DIRECTORY ${MoltenVK_path})
+    if (IS_DIRECTORY "${MoltenVK_path}/include")
+        set(Vulkan_INCLUDE_DIR "${MoltenVK_path}/include")
+        message(STATUS "Found MoltenVK includes at: ${Vulkan_INCLUDE_DIR}")
+    endif()
+
+    # Check for framework
+    set(LEGACY_MoltenVK_XC_path "${MoltenVK_path}/MoltenVK.xcframework")
+    set(STATIC_MoltenVK_XC_path "${MoltenVK_path}/static/MoltenVK.xcframework")
+    set(DYNAMIC_MoltenVK_XC_path "${MoltenVK_path}/dynamic/MoltenVK.xcframework")
+    if (IS_DIRECTORY "${LEGACY_MoltenVK_XC_path}")
+        set(MoltenVK_XC_path ${LEGACY_MoltenVK_XC_path})
+    elseif (IS_DIRECTORY "${STATIC_MoltenVK_XC_path}" AND MOLTENVK_USE_STATIC)
+        set(MoltenVK_XC_path ${STATIC_MoltenVK_XC_path})
+    elseif (IS_DIRECTORY "${DYNAMIC_MoltenVK_XC_path}")
+        set(MoltenVK_XC_path ${DYNAMIC_MoltenVK_XC_path})
+    endif ()
+    if (DEFINED MoltenVK_XC_path)
+        message("Found MoltenVK xcframework at: ${MoltenVK_XC_path}")
+        set(Vulkan_LIBRARIES ${MoltenVK_XC_path})
+    endif ()
+else ()
+    message(WARNING "Provided path ${MoltenVK_path} does not exist!")
+endif ()
+
+include(FindPackageHandleStandardArgs)
+#TODO handle version
+find_package_handle_standard_args(MoltenVK
+                                  DEFAULT_MSG
+                                  Vulkan_INCLUDE_DIR
+                                  Vulkan_LIBRARIES
+)
+
+if(MoltenVK_FOUND)
+    set(MoltenVK_INCLUDE_DIRS ${Vulkan_INCLUDE_DIR})
+    set(MoltenVK_LIBRARIES ${Vulkan_LIBRARIES})
+else()
+    set(MoltenVK_INCLUDE_DIRS)
+    set(MoltenVK_LIBRARIES)
+endif()
+
+mark_as_advanced(MoltenVK_path LEGACY_MoltenVK_XC_path STATIC_MoltenVK_XC_path DYNAMIC_MoltenVK_XC_path MoltenVK_XC_path)
\ No newline at end of file
diff --git a/examples/main.cpp b/examples/main.cpp
index ad8ae41..acc1b76 100644
--- a/examples/main.cpp
+++ b/examples/main.cpp
@@ -5,7 +5,6 @@
  */
 
 #include "Host/GraphicsAppManager.hpp"
-#include "Base/EngineConfiguration.hpp"
 #include "ExampleApps/CubesExampleApp.hpp"
 
 using namespace OpenVulkano;
diff --git a/openVulkanoCpp/Host/iOS/OpenVulkanoViewController.mm b/openVulkanoCpp/Host/iOS/OpenVulkanoViewController.mm
index 873bb95..20f6237 100644
--- a/openVulkanoCpp/Host/iOS/OpenVulkanoViewController.mm
+++ b/openVulkanoCpp/Host/iOS/OpenVulkanoViewController.mm
@@ -8,7 +8,6 @@
 
 #include <MoltenVK/mvk_vulkan.h>
 #include "Host/GraphicsAppManager.hpp"
-#include "ExampleApps/CubesExampleApp.hpp"
 #include "Base/UI/IVulkanWindow.hpp"
 
 #import <MetalKit/MTKView.h>
@@ -128,7 +127,7 @@ public:
 }
 
 -(void*) makeGraphicsApp {
-	return CubesExampleApp::Create();
+	return nullptr;
 }
 
 -(void) dealloc {