From bcaf98f2f1e9da3fcdb8b736045615c844f95019 Mon Sep 17 00:00:00 2001
From: Kai Blaschke <kai.blaschke@kb-dev.net>
Date: Tue, 24 Jan 2023 17:56:12 +0100
Subject: [PATCH] Rename USE_THREADS to PROJECTM_USE_THREADS and export it in
 the package config file.

PROJECTM_USE_THREADS is only exported if ENABLE_CXX_INTERFACE is ON.
---
 CMakeLists.txt                 |  2 +-
 config.h.cmake.in              |  4 ++--
 src/libprojectM/CMakeLists.txt |  7 +++++++
 src/libprojectM/ProjectM.cpp   | 14 +++++++-------
 src/libprojectM/ProjectM.hpp   |  6 +++---
 5 files changed, 20 insertions(+), 13 deletions(-)

diff --git a/CMakeLists.txt b/CMakeLists.txt
index 4ef0bfa08..1a357106f 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -161,7 +161,7 @@ else()
 
     if(ENABLE_THREADING)
         find_package(Threads REQUIRED)
-        set(USE_THREADS YES)
+        set(PROJECTM_USE_THREADS YES)
     endif()
 
     if(ENABLE_LLVM)
diff --git a/config.h.cmake.in b/config.h.cmake.in
index c56b0d1c1..2ce1710b1 100644
--- a/config.h.cmake.in
+++ b/config.h.cmake.in
@@ -66,8 +66,8 @@
 /* Define USE_GLES */
 #cmakedefine01 USE_GLES
 
-/* Define USE_THREADS */
-#cmakedefine01 USE_THREADS
+/* Define PROJECTM_USE_THREADS */
+#cmakedefine01 PROJECTM_USE_THREADS
 
 /* Version number of package */
 #define VERSION "@PROJECT_VERSION@"
diff --git a/src/libprojectM/CMakeLists.txt b/src/libprojectM/CMakeLists.txt
index af2174772..8f67f907a 100644
--- a/src/libprojectM/CMakeLists.txt
+++ b/src/libprojectM/CMakeLists.txt
@@ -170,6 +170,13 @@ install(TARGETS projectM
         )
 
 if(ENABLE_CXX_INTERFACE)
+    if(ENABLE_THREADING)
+        target_compile_definitions(projectM
+                INTERFACE
+                PROJECTM_USE_THREADS
+                )
+    endif()
+
     set_source_files_properties(ProjectM.cpp PCM.cpp PROPERTIES
             COMPILE_DEFINITIONS projectM_api_EXPORTS
             )
diff --git a/src/libprojectM/ProjectM.cpp b/src/libprojectM/ProjectM.cpp
index 0d66db825..a7b934fc4 100644
--- a/src/libprojectM/ProjectM.cpp
+++ b/src/libprojectM/ProjectM.cpp
@@ -30,7 +30,7 @@
 #include "Renderer/PipelineContext.hpp"
 #include "TimeKeeper.hpp"
 
-#if USE_THREADS
+#if PROJECTM_USE_THREADS
 
 #include "libprojectM/BackgroundWorker.hpp"
 
@@ -40,7 +40,7 @@ ProjectM::ProjectM()
     : m_presetFactoryManager(std::make_unique<PresetFactoryManager>())
     , m_pipelineContext(std::make_unique<class PipelineContext>())
     , m_pipelineContext2(std::make_unique<class PipelineContext>())
-#if USE_THREADS
+#if PROJECTM_USE_THREADS
     , m_workerSync(std::make_unique<BackgroundWorkerSync>())
 #endif
 {
@@ -49,7 +49,7 @@ ProjectM::ProjectM()
 
 ProjectM::~ProjectM()
 {
-#if USE_THREADS
+#if PROJECTM_USE_THREADS
     m_workerSync->FinishUp();
     m_workerThread.join();
 #endif
@@ -120,7 +120,7 @@ void ProjectM::DumpDebugImageOnNextFrame()
     m_renderer->writeNextFrameToFile = true;
 }
 
-#if USE_THREADS
+#if PROJECTM_USE_THREADS
 
 void ProjectM::ThreadWorker()
 {
@@ -166,7 +166,7 @@ void ProjectM::RenderFrame()
 
 auto ProjectM::RenderFrameOnlyPass1(Pipeline* pipeline) -> Pipeline*
 {
-#if USE_THREADS
+#if PROJECTM_USE_THREADS
     std::lock_guard<std::recursive_mutex> guard(m_presetSwitchMutex);
 #endif
 
@@ -202,7 +202,7 @@ auto ProjectM::RenderFrameOnlyPass1(Pipeline* pipeline) -> Pipeline*
 
     if (m_timeKeeper->IsSmoothing() && m_transitioningPreset != nullptr)
     {
-#if USE_THREADS
+#if PROJECTM_USE_THREADS
         m_workerSync->WakeUpBackgroundTask();
         // FIXME: Instead of waiting after a single render pass, check every frame if it's done.
         m_workerSync->WaitForBackgroundTaskToFinish();
@@ -310,7 +310,7 @@ void ProjectM::Initialize()
     ResetEngine();
     LoadIdlePreset();
 
-#if USE_THREADS
+#if PROJECTM_USE_THREADS
     m_workerSync->Reset();
     m_workerThread = std::thread(&ProjectM::ThreadWorker, this);
 #endif
diff --git a/src/libprojectM/ProjectM.hpp b/src/libprojectM/ProjectM.hpp
index b2e6d719f..8579989b0 100644
--- a/src/libprojectM/ProjectM.hpp
+++ b/src/libprojectM/ProjectM.hpp
@@ -39,7 +39,7 @@
 #include <string>
 #include <vector>
 
-#if USE_THREADS
+#if PROJECTM_USE_THREADS
 
 #include <mutex>
 #include <thread>
@@ -240,7 +240,7 @@ private:
 
     void LoadIdlePreset();
 
-#if USE_THREADS
+#if PROJECTM_USE_THREADS
 
     void ThreadWorker();
 
@@ -282,7 +282,7 @@ private:
     std::unique_ptr<Preset> m_transitioningPreset; //!< Destination preset when smooth preset switching.
     std::unique_ptr<TimeKeeper> m_timeKeeper;      //!< Keeps the different timers used to render and switch presets.
 
-#if USE_THREADS
+#if PROJECTM_USE_THREADS
     mutable std::recursive_mutex m_presetSwitchMutex;   //!< Mutex for locking preset switching while rendering and vice versa.
     std::thread m_workerThread;                         //!< Background worker for preloading presets.
     std::unique_ptr<BackgroundWorkerSync> m_workerSync; //!< Background work synchronizer.