9 files changed, 167 insertions, 4 deletions
diff --git a/lib/core/c++/abstract/templates.hpp b/lib/core/c++/abstract/templates.hpp
index f675a99..d9d9faa 100644
--- a/lib/core/c++/abstract/templates.hpp
+++ b/lib/core/c++/abstract/templates.hpp
@@ -2,6 +2,7 @@
 
 namespace kel {
 namespace lbm {
-
+template<typename... T>
+constexpr bool always_false = false;
 }
 }
diff --git a/lib/core/c++/environment.hpp b/lib/core/c++/environment.hpp
index 27d8f3a..d8aa9ae 100644
--- a/lib/core/c++/environment.hpp
+++ b/lib/core/c++/environment.hpp
@@ -8,11 +8,13 @@ namespace kel {
 namespace lbm {
 
 struct environment {
+	std::string name;
+	
 	std::filesystem::path lbm_dir;
 	std::filesystem::path data_dir;
 };
 
-saw::error_or<environment> lbm_directory(){
+saw::error_or<environment> setup_lbm_env(const std::string_view name){
 	namespace fs = std::filesystem;
 
 	const char* home_dir = std::getenv("HOME");
@@ -25,6 +27,7 @@ saw::error_or<environment> lbm_directory(){
 	env.lbm_dir = std::filesystem::path{home_dir} / ".lbm";
 
 	{
+		// Set default data location to "${lbm_dir}/data"
 		env.data_dir = env.lbm_dir / "data";
 		// LBM Data Location
 		auto lbm_dir_config = env.lbm_dir / "data_dir_location.txt";
diff --git a/lib/core/c++/hlbm.hpp b/lib/core/c++/hlbm.hpp
index 726f2d8..18c32a5 100644
--- a/lib/core/c++/hlbm.hpp
+++ b/lib/core/c++/hlbm.hpp
@@ -14,6 +14,8 @@ namespace cmpt {
 struct HlbmInit {}; 
 struct Hlbm {};
 struct HlbmParticle {};
+
+struct HlbmOneParticleMomentumExchange {};
 }
 
 template<typename T, typename Descriptor, typename Encode>
@@ -153,5 +155,14 @@ public:
 
 	}
 };
+
+template<typename T, typename Desc, typename Encode>
+class component<T, Desc, cmpt::HlbmOneParticleMomentumExchange, Encode> final {
+public:
+	template<typename CellFieldSchema, typename MacroFieldSchema, typename ParticleSchema>
+	void apply(const saw::data<CellFieldSchema, Encode>& field, const saw::data<MacroFieldSchema,Encode>& macros, const saw::data<ParticleSchema,Encode>& part_group, saw::data<sch::FixedArray<sch::UInt64,1u>> index, saw::data<sch::UInt64> time_step) const {
+		//
+	}
+};
 }
 }
diff --git a/lib/core/tests/particles.cpp b/lib/core/tests/particles.cpp
index de9477c..133c343 100644
--- a/lib/core/tests/particles.cpp
+++ b/lib/core/tests/particles.cpp
@@ -273,9 +273,9 @@ SAW_TEST("Verlet integration test 2D"){
 }
 */
 
-SAW_TEST("Particle / AABB"){
+SAW_TEST("Spheroid Particle / AABB"){
 	using namespace kel;
 
-
+	
 }
 }
diff --git a/lib/png/.nix/derivation.nix b/lib/png/.nix/derivation.nix
new file mode 100644
index 0000000..6e52083
--- /dev/null
+++ b/lib/png/.nix/derivation.nix
@@ -0,0 +1,38 @@
+{ lib
+, stdenv
+, scons
+, clang-tools
+, pname
+, version
+, forstio
+, kel-lbm
+, adaptive-cpp
+}:
+
+stdenv.mkDerivation {
+	pname = "${pname}-png";
+	inherit version;
+	src = ./..;
+
+	nativeBuildInputs = [
+		scons
+		clang-tools
+	];
+
+	buildInputs = [
+		forstio.core
+		forstio.async
+		forstio.codec
+		kel-lbm.core
+	];
+
+	doCheck = true;
+	checkPhase = ''
+		scons test
+		./bin/tests
+	'';
+
+	preferLocalBuild = true;
+
+	outputs = [ "out" "dev" ];
+}
diff --git a/lib/png/SConstruct b/lib/png/SConstruct
new file mode 100644
index 0000000..8b3ab01
--- /dev/null
+++ b/lib/png/SConstruct
@@ -0,0 +1,75 @@
+#!/usr/bin/env python3
+
+import sys
+import os
+import os.path
+import glob
+import re
+
+
+if sys.version_info < (3,):
+    def isbasestring(s):
+        return isinstance(s,basestring)
+else:
+    def isbasestring(s):
+        return isinstance(s, (str,bytes))
+
+def add_kel_source_files(self, sources, filetype, lib_env=None, shared=False, target_post=""):
+
+    if isbasestring(filetype):
+        dir_path = self.Dir('.').abspath
+        filetype = sorted(glob.glob(dir_path+"/"+filetype))
+
+    for path in filetype:
+        target_name = re.sub( r'(.*?)(\.cpp|\.c\+\+)', r'\1' + target_post, path )
+        if shared:
+            target_name+='.os'
+            sources.append( self.SharedObject( target=target_name, source=path ) )
+        else:
+            target_name+='.o'
+            sources.append( self.StaticObject( target=target_name, source=path ) )
+    pass
+
+def isAbsolutePath(key, dirname, env):
+	assert os.path.isabs(dirname), "%r must have absolute path syntax" % (key,)
+
+env_vars = Variables(
+	args=ARGUMENTS
+)
+
+env_vars.Add('prefix',
+	help='Installation target location of build results and headers',
+	default='/usr/local/',
+	validator=isAbsolutePath
+)
+
+env=Environment(ENV=os.environ, variables=env_vars, CPPPATH=[],
+    CPPDEFINES=['SAW_UNIX'],
+    CXXFLAGS=[
+        '-std=c++20',
+        '-g',
+        '-Wall',
+        '-Wextra'
+    ],
+    LIBS=[
+        'forstio-core'
+    ]
+);
+env.__class__.add_source_files = add_kel_source_files
+env.Tool('compilation_db');
+env.cdb = env.CompilationDatabase('compile_commands.json');
+
+env.objects = [];
+env.sources = [];
+env.headers = [];
+env.targets = [];
+
+Export('env')
+SConscript('c++/SConscript')
+SConscript('tests/SConscript')
+
+env.Alias('cdb', env.cdb);
+env.Alias('all', [env.targets]);
+env.Default('all');
+
+env.Alias('install', '$prefix')
diff --git a/lib/png/c++/SConscript b/lib/png/c++/SConscript
new file mode 100644
index 0000000..75b8645
--- /dev/null
+++ b/lib/png/c++/SConscript
@@ -0,0 +1,27 @@
+#!/bin/false
+
+import os
+import os.path
+import glob
+
+
+Import('env')
+
+dir_path = Dir('.').abspath
+
+# Environment for base library
+png_env = env.Clone();
+
+png_env.sources = sorted(glob.glob(dir_path + "/*.cpp"));
+png_env.headers = sorted(glob.glob(dir_path + "/*.hpp"));
+
+env.sources += png_env.sources;
+env.headers += png_env.headers;
+
+## Static lib
+objects = []
+png_env.add_source_files(objects, png_env.sources, shared=False);
+env.library_static = png_env.StaticLibrary('#build/kel-lbm-png', [objects]);
+
+env.Install('$prefix/lib/', env.library_static);
+env.Install('$prefix/include/kel/lbm/png/', png_env.headers);
diff --git a/lib/png/c++/png.cpp b/lib/png/c++/png.cpp
new file mode 100644
index 0000000..248a8a5
--- /dev/null
+++ b/lib/png/c++/png.cpp
@@ -0,0 +1 @@
+#include "png.hpp"
diff --git a/lib/png/c++/png.hpp b/lib/png/c++/png.hpp
new file mode 100644
index 0000000..f675a99
--- /dev/null
+++ b/lib/png/c++/png.hpp
@@ -0,0 +1,7 @@
+#pragma once
+
+namespace kel {
+namespace lbm {
+
+}
+}