allow building Furnace without SDL2 and libsndfile

for eventual libfurnace

CMakeLists.txt

@@ -18,6 +18,8 @@ set(CMAKE_PROJECT_VERSION_MINOR 6)
 set(CMAKE_PROJECT_VERSION_PATCH 0)
 
 set(BUILD_GUI_DEFAULT ON)
+set(USE_SDL2_DEFAULT ON)
+set(USE_SNDFILE_DEFAULT ON)
 set(SYSTEM_SDL2_DEFAULT OFF)
 
 if (ANDROID)
@@ -35,7 +37,9 @@ else()
 endif()
 
 option(BUILD_GUI "Build the tracker (disable to build only a headless player)" ${BUILD_GUI_DEFAULT})
-option(USE_RTMIDI "Build with MIDI support using RtMidi. Currently unfinished." ${USE_RTMIDI_DEFAULT})
+option(USE_RTMIDI "Build with MIDI support using RtMidi." ${USE_RTMIDI_DEFAULT})
+option(USE_SDL2 "Build with SDL2. Required to build with GUI." ${USE_SDL2_DEFAULT})
+option(USE_SNDFILE "Build with libsndfile. Required in order to work with audio files." ${USE_SNDFILE_DEFAULT})
 option(WITH_JACK "Whether to build with JACK support. Auto-detects if JACK is available" ${WITH_JACK_DEFAULT})
 option(SYSTEM_FMT "Use a system-installed version of fmt instead of the vendored one" OFF)
 option(SYSTEM_LIBSNDFILE "Use a system-installed version of libsndfile instead of the vendored one" OFF)
@@ -93,6 +97,8 @@ else()
   message(STATUS "Using vendored fmt")
 endif()
 
+if (USE_SNDFILE)
+  list(APPEND DEPENDENCIES_DEFINES HAVE_SNDFILE)
   if (SYSTEM_LIBSNDFILE)
     find_package(PkgConfig REQUIRED)
     pkg_check_modules(LIBSNDFILE REQUIRED sndfile)
@@ -113,6 +119,9 @@ else()
     list(APPEND DEPENDENCIES_LIBRARIES sndfile)
     message(STATUS "Using vendored libsndfile")
   endif()
+else()
+  message(STATUS "Not using libsndfile")
+endif()
 
 if (USE_RTMIDI)
   if (SYSTEM_RTMIDI)
@@ -154,10 +163,12 @@ else()
   message(STATUS "Using vendored zlib")
 endif()
 
+if (USE_SDL2)
   if (SYSTEM_SDL2)
     if (PKG_CONFIG_FOUND)
       pkg_check_modules(SDL2 sdl2>=${SYSTEM_SDL_MIN_VER})
       if (SDL2_FOUND)
+        list(APPEND DEPENDENCIES_DEFINES HAVE_SDL2)
         list(APPEND DEPENDENCIES_INCLUDE_DIRS ${SDL2_INCLUDE_DIRS})
         list(APPEND DEPENDENCIES_COMPILE_OPTIONS ${SDL2_CFLAGS_OTHER})
         list(APPEND DEPENDENCIES_LIBRARIES ${SDL2_LIBRARIES})
@@ -168,6 +179,7 @@ if (SYSTEM_SDL2)
     endif()
     if (NOT SDL2_FOUND)
       find_package(SDL2 ${SYSTEM_SDL_MIN_VER} REQUIRED)
+      list(APPEND DEPENDENCIES_DEFINES HAVE_SDL2)
       list(APPEND DEPENDENCIES_INCLUDE_DIRS ${SDL2_INCLUDE_DIR})
       list(APPEND DEPENDENCIES_LIBRARIES ${SDL2_LIBRARY})
     endif()
@@ -186,6 +198,7 @@ else()
     #   This should probably go in a FAQ.
     set(SDL_LIBC ON CACHE BOOL "Tell SDL that we want it to use our C runtime (required for proper static linking)" FORCE)
     add_subdirectory(extern/SDL EXCLUDE_FROM_ALL)
+    list(APPEND DEPENDENCIES_DEFINES HAVE_SDL2)
     list(APPEND DEPENDENCIES_INCLUDE_DIRS extern/SDL/include)
     if (ANDROID)
       list(APPEND DEPENDENCIES_LIBRARIES SDL2)
@@ -198,13 +211,22 @@ else()
     endif()
     message(STATUS "Using vendored SDL2")
   endif()
+else()
+  message(STATUS "Not using SDL2")
+  if (BUILD_GUI)
+    message(FATAL_ERROR "SDL2 is required in order to build with GUI! Disable BUILD_GUI otherwise.")
+  endif()
+endif()
 
 set(AUDIO_SOURCES
 src/audio/abstract.cpp
 src/audio/midi.cpp
-src/audio/sdl.cpp
 )
 
+if (USE_SDL2)
+  list(APPEND AUDIO_SOURCES src/audio/sdl.cpp)
+endif()
+
 if (WITH_JACK)
   find_package(PkgConfig REQUIRED)
   pkg_check_modules(JACK REQUIRED jack)

src/engine/engine.cpp

@@ -23,7 +23,9 @@
 #include "safeReader.h"
 #include "../ta-log.h"
 #include "../fileutils.h"
+#ifdef HAVE_SDL2
 #include "../audio/sdl.h"
+#endif
 #include <stdexcept>
 #ifndef _WIN32
 #include <unistd.h>
@@ -34,7 +36,9 @@
 #include "../audio/jack.h"
 #endif
 #include <math.h>
+#ifdef HAVE_SNDFILE
 #include <sndfile.h>
+#endif
 #include <fmt/printf.h>
 
 void process(void* u, float** in, float** out, int inChans, int outChans, unsigned int size) {
@@ -187,6 +191,7 @@ bool DivEngine::isExporting() {
 
 #define EXPORT_BUFSIZE 2048
 
+#ifdef HAVE_SNDFILE
 void DivEngine::runExportThread() {
   switch (exportMode) {
     case DIV_EXPORT_MODE_ONE: {
@@ -438,8 +443,16 @@ void DivEngine::runExportThread() {
   }
   stopExport=false;
 }
+#else
+void DivEngine::runExportThread() {
+}
+#endif
 
 bool DivEngine::saveAudio(const char* path, int loops, DivAudioExportModes mode) {
+#ifndef HAVE_SNDFILE
+  logE("Furnace was not compiled with libsndfile. cannot export!");
+  return false;
+#else
   exportPath=path;
   exportMode=mode;
   if (exportMode!=DIV_EXPORT_MODE_ONE) {
@@ -461,6 +474,7 @@ bool DivEngine::saveAudio(const char* path, int loops, DivAudioExportModes mode)
   remainingLoops=loops;
   exportThread=new std::thread(_runExportThread,this);
   return true;
+#endif
 }
 
 void DivEngine::waitAudioFile() {
@@ -2015,6 +2029,10 @@ int DivEngine::addSampleFromFile(const char* path) {
     }
   }
 
+#ifndef HAVE_SNDFILE
+  lastError="Furnace was not compiled with libsndfile!";
+  return -1;
+#else
   SF_INFO si;
   SNDFILE* f=sf_open(path,SFM_READ,&si);
   if (f==NULL) {
@@ -2093,6 +2111,7 @@ int DivEngine::addSampleFromFile(const char* path) {
   renderSamples();
   BUSY_END;
   return sampleCount;
+#endif
 }
 
 void DivEngine::delSample(int index) {
@@ -2743,13 +2762,23 @@ bool DivEngine::initAudioBackend() {
       logE("Furnace was not compiled with JACK support!");
       setConf("audioEngine","SDL");
       saveConf();
+#ifdef HAVE_SDL2
       output=new TAAudioSDL;
+#else
+      logE("Furnace was not compiled with SDL support either!");
+      output=new TAAudio;
+#endif
 #else
       output=new TAAudioJACK;
 #endif
       break;
     case DIV_AUDIO_SDL:
+#ifdef HAVE_SDL2
       output=new TAAudioSDL;
+#else
+      logE("Furnace was not compiled with SDL support!");
+      output=new TAAudio;
+#endif
       break;
     case DIV_AUDIO_DUMMY:
       output=new TAAudio;
@@ -2844,7 +2873,7 @@ bool DivEngine::init() {
   // init config
 #ifdef _WIN32
   configPath=getWinConfigPath();
-#elif defined(ANDROID)
+#elif defined(IS_MOBILE)
   configPath=SDL_GetPrefPath("tildearrow","furnace");
 #else
   struct stat st;

src/engine/playback.cpp

@@ -23,7 +23,9 @@
 #include "engine.h"
 #include "../ta-log.h"
 #include <math.h>
+#ifdef HAVE_SNDFILE
 #include <sndfile.h>
+#endif
 
 constexpr int MASTER_CLOCK_PREC=(sizeof(void*)==8)?8:0;
 

src/engine/sample.cpp

@@ -21,7 +21,9 @@
 #include "../ta-log.h"
 #include <math.h>
 #include <string.h>
+#ifdef HAVE_SNDFILE
 #include <sndfile.h>
+#endif
 #include "filter.h"
 
 extern "C" {
@@ -37,6 +39,10 @@ DivSampleHistory::~DivSampleHistory() {
 }
 
 bool DivSample::save(const char* path) {
+#ifndef HAVE_SNDFILE
+  logE("Furnace was not compiled with libsndfile!");
+  return false;
+#else
   SNDFILE* f;
   SF_INFO si;
   memset(&si,0,sizeof(SF_INFO));
@@ -76,6 +82,7 @@ bool DivSample::save(const char* path) {
   sf_close(f);
 
   return true;
+#endif
 }
 
 // 16-bit memory is padded to 512, to make things easier for ADPCM-A/B.