Make vulkan build as optional (google#4814)

Add option WITH_VULKAN, which is ON by default.
If set to OFF, modules OrbitTriggerCaptureVulkanLayer, OrbitVulkanLayer,
and VulkanTutorial won't be built

CMakeLists.txt

@@ -67,6 +67,14 @@ set(CMAKE_EXPORT_COMPILE_COMMANDS ON)
 
 option(WITH_GUI "Setting this option will enable the Qt-based UI client." ON)
 
+if(NOT WIN32)
+  option(WITH_VULKAN "Setting this option will enable Vulkan" ON)
+
+  if(WITH_VULKAN)
+    add_definitions(-DVULKAN_ENABLED)
+  endif()
+endif()
+
 # This is only for designated initializers
 if(WIN32)
   set(CMAKE_CXX_STANDARD 20 CACHE STRING "C++ Standard" FORCE)
@@ -127,9 +135,11 @@ else()
   find_package(libbase REQUIRED)
   find_package(liblog REQUIRED)
   find_package(libprocinfo REQUIRED)
-  find_package(volk REQUIRED)
-  find_package(VulkanHeaders REQUIRED)
-  find_package(vulkan-validationlayers REQUIRED)
+  if(WITH_VULKAN)
+    find_package(volk REQUIRED)
+    find_package(VulkanHeaders REQUIRED)
+    find_package(vulkan-validationlayers REQUIRED)
+  endif()
 endif()
 
 include("cmake/protobuf.cmake")
@@ -173,13 +183,15 @@ else()
   add_subdirectory(src/OrbitClientGgp)
   add_subdirectory(src/OrbitCaptureGgpClient)
   add_subdirectory(src/OrbitCaptureGgpService)
-  add_subdirectory(src/OrbitTriggerCaptureVulkanLayer)
-  add_subdirectory(src/OrbitVulkanLayer)
   add_subdirectory(src/ProcessService)
   add_subdirectory(src/TracepointService)
   add_subdirectory(src/UserSpaceInstrumentation)
-  add_subdirectory(src/VulkanTutorial)
   add_subdirectory(third_party/libunwindstack)
+  if(WITH_VULKAN)
+    add_subdirectory(src/OrbitTriggerCaptureVulkanLayer)
+    add_subdirectory(src/OrbitVulkanLayer)
+    add_subdirectory(src/VulkanTutorial)
+  endif()
 endif()
 
 add_subdirectory(src/Api)

src/LinuxTracingIntegrationTests/CMakeLists.txt

@@ -35,14 +35,17 @@ target_link_libraries(IntegrationTestCommons PUBLIC
         ModuleUtils
         ObjectUtils
         OrbitBase
-        OffscreenRenderingVulkanTutorialLib
         GTest::gtest
         absl::base
         absl::time
         absl::flat_hash_set
         absl::strings
         absl::synchronization)
 
+if(WITH_VULKAN)
+  target_link_libraries(IntegrationTestCommons PUBLIC OffscreenRenderingVulkanTutorialLib)
+endif()
+
 
 add_executable(LinuxTracingIntegrationTests)
 

src/LinuxTracingIntegrationTests/IntegrationTestPuppet.cpp

@@ -19,7 +19,9 @@
 #include "OrbitBase/ExecutablePath.h"
 #include "OrbitBase/Logging.h"
 #include "OrbitBase/ThreadUtils.h"
+#ifdef VULKAN_ENABLED
 #include "VulkanTutorial/OffscreenRenderingVulkanTutorial.h"
+#endif
 
 // This executable is used by LinuxTracingIntegrationTest to test the generation of specific
 // perf_event_open events. The behavior is controlled by commands sent on standard input.
@@ -104,10 +106,12 @@ static void LoadSoWithDlopenAndCallFunction() {
   ORBIT_LOG("Function call completed: %f", function());
 }
 
+#ifdef VULKAN_ENABLED
 static void RunVulkanTutorial() {
   orbit_vulkan_tutorial::OffscreenRenderingVulkanTutorial tutorial;
   tutorial.Run(PuppetConstants::kFrameCount);
 }
+#endif
 
 extern "C" __attribute__((noinline)) void UseOrbitApi() {
   for (uint64_t i = 0; i < PuppetConstants::kOrbitApiUsageCount; ++i) {
@@ -194,7 +198,11 @@ int IntegrationTestPuppetMain() {
     } else if (command == PuppetConstants::kDlopenCommand) {
       LoadSoWithDlopenAndCallFunction();
     } else if (command == PuppetConstants::kVulkanTutorialCommand) {
+#ifdef VULKAN_ENABLED
       RunVulkanTutorial();
+#else
+      ORBIT_ERROR("Vulkan isn't enabled. Build with WITH_VULKAN=ON");
+#endif
     } else if (command == PuppetConstants::kOrbitApiCommand) {
       UseOrbitApi();
     } else if (command == PuppetConstants::kIncreaseRssCommand) {