add pocketfft

Makefile

@@ -4,7 +4,7 @@ SOURCES += $(IMGUI_DIR)/imgui.cpp $(IMGUI_DIR)/imgui_demo.cpp $(IMGUI_DIR)/imgui
 SOURCES += $(IMGUI_DIR)/backends/imgui_impl_glfw.cpp $(IMGUI_DIR)/backends/imgui_impl_opengl3.cpp
 OBJS = $(addsuffix .o, $(basename $(notdir $(SOURCES))))
 
-CXXFLAGS = -std=c++14 -I$(IMGUI_DIR) -I$(IMGUI_DIR)/backends
+CXXFLAGS = -std=c++14 -I$(IMGUI_DIR) -I$(IMGUI_DIR)/backends -I$(POCKETFFT_DIR)
 CXXFLAGS += -g -Wall -Wformat -O2
 LIBS = -L$(TINYALSA_DIR)/lib
 

flake.nix

@@ -7,6 +7,11 @@
     let
       pkgs = import nixpkgs { system = "x86_64-linux"; };
       imgui_dir = "${pkgs.imgui}/include/imgui";
+      pocketfft = pkgs.fetchgit {
+        url = "https://gitlab.mpcdf.mpg.de/mtr/pocketfft.git";
+        rev = "ecd78caa1c862e18fb1a55bcd4e30a05430b01f6";
+        hash = "sha256-xl7Tr1A1cqXhAL1Bljfk68R3AB1xOgkH15LHKxjYoSc=";
+      };
     in rec {
       packages.x86_64-linux.microsa = pkgs.stdenv.mkDerivation {
         name = "microsa";
@@ -15,6 +20,7 @@
         propagatedBuildInputs = [ pkgs.wayland pkgs.glfw-wayland pkgs.libffi pkgs.alsa-lib ];
         preBuild = ''
           export IMGUI_DIR=${imgui_dir}
+          export POCKETFFT_DIR=${pocketfft}
         '';
         installPhase = ''
           mkdir -p $out/bin

main.cpp

@@ -14,6 +14,9 @@
 
 #include <alsa/asoundlib.h>
 
+#include <pocketfft_hdronly.h>
+
+
 static std::atomic<bool> terminate_dsp;
 
 static snd_pcm_t* pcm;