Add CMake find modules for FFTW, LibSampleratae and LibSndFile.

Removes reliance on pkg-config for finding these libraries.

cmake/modules/FindFFTW.cmake

@@ -0,0 +1,47 @@
+# FindFFTW.cmake - Try to find FFTW3
+# Copyright (c) 2018 Lukas W <lukaswhl/at/gmail.com>
+# This file is MIT licensed.
+# See http://opensource.org/licenses/MIT
+
+# Try pkgconfig for hints
+find_package(PkgConfig QUIET)
+
+if(NOT FFTW_FIND_COMPONENTS)
+	set(FFTW_FIND_COMPONENTS fftw3f fftw3 fftwl)
+endif()
+
+if(PKG_CONFIG_FOUND)
+	pkg_check_modules(FFTW_PKG fftw>=3.0.0)
+	pkg_check_modules(FFTW3_PKG fftw3>=3.0.0)
+endif()
+
+find_path(FFTW_INCLUDE_DIR
+	NAMES fftw3.h
+	PATHS ${FFTW_PKG_INCLUDE_DIRS} ${FFTW3_PKG_INCLUDE_DIRS}
+)
+
+set(check_list)
+
+foreach(comp ${FFTW_FIND_COMPONENTS})
+	string(TOUPPER ${comp} COMP)
+	if(PKG_CONFIG_FOUND)
+		pkg_check_modules(${COMP}_PKG REQUIRED ${comp}>=3.0.0)
+	endif()
+
+	find_library(${COMP}_LIBRARY
+		NAMES ${comp}
+		PATHS ${comp}_PKG_LIBRARY_DIRS
+ 	)
+ 	list(APPEND check_list ${COMP}_LIBRARY)
+
+	set(${COMP}_LIBRARIES ${${COMP}_LIBRARY} CACHE FILEPATH "${COMP} library path")
+	set(${COMP}_INCLUDE_DIRS ${FFTW_INCLUDE_DIR} CACHE PATH "${COMP} include path")
+	mark_as_advanced(${COMP}_LIBRARIES ${COMP}_INCLUDE_DIRS)
+endforeach()
+
+find_package(PackageHandleStandardArgs)	
+find_package_handle_standard_args(FFTW DEFAULT_MSG FFTW_INCLUDE_DIR ${check_list})
+
+set(FFTW_INCLUDE_DIRS ${FFTW_INCLUDE_DIR})
+
+mark_as_advanced(FFTW_LIBRARY FFTW_LIBRARIES FFTW_INCLUDE_DIR FFTW_INCLUDE_DIRS ${check_list})

cmake/modules/FindSamplerate.cmake

@@ -0,0 +1,34 @@
+# FindFFTW.cmake - Try to find FFTW3
+# Copyright (c) 2018 Lukas W <lukaswhl/at/gmail.com>
+# This file is MIT licensed.
+# See http://opensource.org/licenses/MIT
+
+find_package(PkgConfig QUIET)
+if(PKG_CONFIG_FOUND)
+	pkg_check_modules(SAMPLERATE_PKG samplerate)
+endif()
+
+find_path(SAMPLERATE_INCLUDE_DIR
+	NAMES samplerate.h
+	PATHS ${SAMPLERATE_PKG_INCLUDE_DIRS}
+)
+
+set(SAMPLERATE_NAMES samplerate libsamplerate)
+if(Samplerate_FIND_VERSION_MAJOR)
+	list(APPEND SAMPLERATE_NAMES libsamplerate-${Samplerate_FIND_VERSION_MAJOR})
+else()
+	list(APPEND SAMPLERATE_NAMES libsamplerate-0)
+endif()
+
+find_library(SAMPLERATE_LIBRARY
+	NAMES ${SAMPLERATE_NAMES}
+	PATHS ${SAMPLERATE_PKG_LIBRARY_DIRS}
+)
+
+include(FindPackageHandleStandardArgs)
+find_package_handle_standard_args(SAMPLERATE DEFAULT_MSG SAMPLERATE_LIBRARY SAMPLERATE_INCLUDE_DIR)
+
+mark_as_advanced(SAMPLERATE_INCLUDE_DIR SAMPLERATE_LIBRARY )
+
+set(SAMPLERATE_LIBRARIES ${SAMPLERATE_LIBRARY} )
+set(SAMPLERATE_INCLUDE_DIRS ${SAMPLERATE_INCLUDE_DIR})

cmake/modules/FindSndFile.cmake

@@ -0,0 +1,39 @@
+# FindSndFile.cmake - Try to find libsndfile
+# Copyright (c) 2018 Lukas W <lukaswhl/at/gmail.com>
+# This file is MIT licensed.
+# See http://opensource.org/licenses/MIT
+
+# Try pkgconfig for hints
+find_package(PkgConfig QUIET)
+if(PKG_CONFIG_FOUND)
+	pkg_check_modules(SNDFILE_PKG sndfile)
+endif(PKG_CONFIG_FOUND)
+set(SndFile_DEFINITIONS ${SNDFILE_PKG_CFLAGS_OTHER})
+
+if(WIN32)
+	# Try Vcpkg
+	find_package(LibSndFile ${SndFile_FIND_VERSION} CONFIG QUIET)
+	if(LibSndFile_FOUND)
+		get_target_property(LibSndFile_Location sndfile-shared LOCATION)
+		get_target_property(LibSndFile_Include_Path sndfile-shared INTERFACE_INCLUDE_DIRECTORIES)
+		get_filename_component(LibSndFile_Path LibSndFile_Location PATH)
+	endif()
+endif()
+
+find_path(SNDFILE_INCLUDE_DIR
+	NAMES sndfile.h
+	PATHS ${SNDFILE_PKG_INCLUDE_DIRS} ${LibSndFile_Include_Path}
+)
+
+find_library(SNDFILE_LIBRARY
+	NAMES sndfile libsndfile libsndfile-1
+	PATHS ${SNDFILE_PKG_LIBRARY_DIRS} ${LibSndFile_Path}
+)
+
+find_package(PackageHandleStandardArgs)
+find_package_handle_standard_args(SndFile DEFAULT_MSG SNDFILE_LIBRARY SNDFILE_INCLUDE_DIR)
+
+set(SNDFILE_LIBRARIES ${SNDFILE_LIBRARY})
+set(SNDFILE_INCLUDE_DIRS ${SNDFILE_INCLUDE_DIR})
+
+mark_as_advanced(SNDFILE_LIBRARY SNDFILE_LIBRARIES SNDFILE_INCLUDE_DIR SNDFILE_INCLUDE_DIRS)