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Allow using external libflac

Package developers are usually against using bundled libs.
Lets help them out by providing a way of using the
installed libflac. The default behavior is the same as
before.

--- a/CMakeLists.txt

+++ b/CMakeLists.txt

@@ -2,6 +2,8 @@

 project(ft2-clone)

+option(EXTERNAL_LIBFLAC "use external(system) flac library" OFF)

+

 find_package(SDL2 REQUIRED)

 set(CMAKE_RUNTIME_OUTPUT_DIRECTORY "${ft2-clone_SOURCE_DIR}/release/other/")

@@ -13,7 +15,6 @@

     "${ft2-clone_SOURCE_DIR}/src/scopes/*.c"

     "${ft2-clone_SOURCE_DIR}/src/modloaders/*.c"

     "${ft2-clone_SOURCE_DIR}/src/smploaders/*.c"

-    "${ft2-clone_SOURCE_DIR}/src/libflac/*.c"

 )

 add_executable(ft2-clone ${ft2-clone_SRC})

@@ -33,6 +34,19 @@

     PRIVATE HAS_MIDI

     PRIVATE __LINUX_ALSA__

     PRIVATE HAS_LIBFLAC)

+

+if(EXTERNAL_LIBFLAC)

+    find_package(PkgConfig REQUIRED)

+    pkg_check_modules(FLAC REQUIRED IMPORTED_TARGET flac)

+    target_compile_definitions(ft2-clone

+        PRIVATE EXTERNAL_LIBFLAC)

+    target_link_libraries(ft2-clone

+        PRIVATE PkgConfig::FLAC)

+else()

+    file(GLOB flac_SRCS

+        "${ft2-clone_SOURCE_DIR}/src/libflac/*.c")

+    target_sources(ft2-clone PRIVATE ${flac_SRCS})

+endif()

 install(TARGETS ft2-clone

     RUNTIME DESTINATION bin)

--- a/src/smploaders/ft2_load_flac.c

+++ b/src/smploaders/ft2_load_flac.c

@@ -25,7 +25,12 @@

 #include "../ft2_sample_ed.h"

 #include "../ft2_sysreqs.h"

 #include "../ft2_sample_loader.h"

+

+#ifdef EXTERNAL_LIBFLAC

+#include <FLAC/stream_decoder.h>

+#else

 #include "../libflac/FLAC/stream_decoder.h"

+#endif

 static bool sample16Bit;

 static int16_t stereoSampleLoadMode = -1;