From 60dd654b13c364e2aac53f2cb76a368d388bf070 Mon Sep 17 00:00:00 2001
From: "Claudius \"keldu\" Holeksa" <mail@keldu.de>
Date: Sun, 22 Sep 2024 23:32:40 +0200
Subject: Added basic setup

---
 .nix/derivation.nix |  8 ++++++
 SConstruct          | 68 +++++++++++++++++++++++++++++++++++++++++++++++++++
 c++/SConscript      | 37 ++++++++++++++++++++++++++++
 c++/ico.hpp         | 70 +++++++++++++++++++++++++++++++++++++++++++++++++++++
 default.nix         |  3 +++
 5 files changed, 186 insertions(+)
 create mode 100644 .nix/derivation.nix
 create mode 100644 SConstruct
 create mode 100644 c++/SConscript
 create mode 100644 c++/ico.hpp
 create mode 100644 default.nix

diff --git a/.nix/derivation.nix b/.nix/derivation.nix
new file mode 100644
index 0000000..b318a46
--- /dev/null
+++ b/.nix/derivation.nix
@@ -0,0 +1,8 @@
+{ stdenv
+}:
+stdenv.mkDerivation {
+	pname = "icosahedrical_destruction";
+	version = "0.0.0";
+
+	src = ./..;
+}
diff --git a/SConstruct b/SConstruct
new file mode 100644
index 0000000..c07c9b4
--- /dev/null
+++ b/SConstruct
@@ -0,0 +1,68 @@
+#!/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=[],
+    CXX=['c++'],
+    CPPDEFINES=[],
+    CXXFLAGS=['-std=c++20','-g','-Wall','-Wextra'],
+    LIBS=[])
+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')
+
+# Aliasing
+env.Alias('cdb', env.cdb);
+env.Alias('all', [env.targets]);
+env.Default('all');
+
+env.Alias('install', '$prefix')
diff --git a/c++/SConscript b/c++/SConscript
new file mode 100644
index 0000000..beb41e5
--- /dev/null
+++ b/c++/SConscript
@@ -0,0 +1,37 @@
+#!/bin/false
+
+import os
+import os.path
+import glob
+
+
+Import('env')
+
+dir_path = Dir('.').abspath
+
+# Environment for base library
+core_env = env.Clone();
+
+core_env.sources = sorted(glob.glob(dir_path + "/*.cpp"))
+core_env.headers = sorted(glob.glob(dir_path + "/*.hpp"))
+
+env.sources += core_env.sources;
+env.headers += core_env.headers;
+
+## Shared lib
+objects_shared = []
+core_env.add_source_files(objects_shared, core_env.sources, shared=True);
+env.library_shared = core_env.SharedLibrary('#build/icosahedrical_destruction', [objects_shared]);
+
+# Set Alias
+env.Alias('library', [env.library_shared]);
+
+env.targets += ['library'];
+
+# Install
+env.Install('$prefix/lib/', [env.library_shared]);
+env.Install('$prefix/include/sims/icosahedrical_destruction', [core_env.headers]);
+
+# Test
+# Export('core_env');
+# SConscript('tests/SConscript');
diff --git a/c++/ico.hpp b/c++/ico.hpp
new file mode 100644
index 0000000..0ac1a91
--- /dev/null
+++ b/c++/ico.hpp
@@ -0,0 +1,70 @@
+#pragma once
+
+#include <array>
+#include <cstdint>
+
+namespace kel {
+namespace impl {
+struct ico_surface_helper {
+	/**
+	 * On each triangle we assume a ccw order and we start on the top-left part of the
+	 * triangle. The orientation of the triangle is determined by the horizontal line
+	 * (on the 2D foldout of the icosahedron) which is the down direction.  
+	 */
+	static constexpr std::array<std::array<uint8_t,3u>, 20u> neighbour_map {
+		{1,4,5},//0
+		{2,0,6},//1
+		{3,1,7},//2
+		{4,2,8},//3
+		{0,3,9},//4
+		{14,10,0},//5
+		{10,11,1},//6
+		{11,12,2},//7
+		{12,13,3},//8
+		{13,14,4},//9
+		{6,5,15},//10
+		{7,6,16},//11
+		{8,7,17},//12
+		{9,8,18},//13
+		{5,9,19},//14
+		{19,16,10},//15
+		{15,17,11},//16
+		{16,18,12},//17
+		{17,19,13},//18
+		{18,15,14} //19
+	};
+};
+}
+
+template<uint64_t SubD>
+class ico_addr {
+private:
+	std::array<uint8_t, SubD+1u> vals_;
+public:
+	template<uint64_t Div = 1u>
+	ico_addr<Div> slice() const {
+		return {};
+	}
+};
+
+template<typename T, uint64_t D>
+class ico_triangle {
+private:
+	std::array<ico_triangle<T,D-1u>> subdivs_;
+public:
+};
+
+template<typename T>
+class ico_triangle<T,0u> final {
+private:
+	T val_;
+public:
+};
+
+template<typename T, uint64_t SubD>
+class icosahedron final {
+private:
+	std::array<ico_triangle<T,SubD>,20u> surfaces_;
+public:
+};
+}
diff --git a/default.nix b/default.nix
new file mode 100644
index 0000000..99e112c
--- /dev/null
+++ b/default.nix
@@ -0,0 +1,3 @@
+{ pkgs ? import <nixpkgs> {}
+}:
+pkgs.callPackage ./.nix/derivation.nix {}
-- 
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