From a725685ddaa2eaa0711ceb51e1f74d09349d618e Mon Sep 17 00:00:00 2001
From: Adrian Kummerlaender
Date: Tue, 29 Oct 2019 21:04:53 +0100
Subject: Add example for C++ target

---
 ldc_2d/cpp/CMakeLists.txt | 37 +++++++++++++++++++++++++++++++++++++
 ldc_2d/cpp/generate.py    | 24 ++++++++++++++++++++++++
 ldc_2d/cpp/ldc_2d.cc      | 12 ++++++++++++
 ldc_2d/cpp/shell.nix      | 42 ++++++++++++++++++++++++++++++++++++++++++
 4 files changed, 115 insertions(+)
 create mode 100644 ldc_2d/cpp/CMakeLists.txt
 create mode 100755 ldc_2d/cpp/generate.py
 create mode 100644 ldc_2d/cpp/ldc_2d.cc
 create mode 100644 ldc_2d/cpp/shell.nix

diff --git a/ldc_2d/cpp/CMakeLists.txt b/ldc_2d/cpp/CMakeLists.txt
new file mode 100644
index 0000000..fe04297
--- /dev/null
+++ b/ldc_2d/cpp/CMakeLists.txt
@@ -0,0 +1,37 @@
+cmake_minimum_required(VERSION 3.10)
+project(ldc_2d LANGUAGES CXX)
+
+add_custom_target(
+	boltzgen_kernel
+	COMMAND
+		${CMAKE_CURRENT_SOURCE_DIR}/generate.py
+)
+
+include_directories(
+	${CMAKE_BINARY_DIR}
+)
+
+add_executable(
+	ldc_2d
+		ldc_2d.cc
+)
+
+add_dependencies(
+	ldc_2d
+		boltzgen_kernel
+)
+
+target_compile_features(
+	ldc_2d
+	PUBLIC
+		cxx_std_17
+)
+
+find_package(OpenMP)
+if(OpenMP_CXX_FOUND)
+	target_link_libraries(
+		ldc_2d
+		PUBLIC
+			OpenMP::OpenMP_CXX
+	)
+endif()
diff --git a/ldc_2d/cpp/generate.py b/ldc_2d/cpp/generate.py
new file mode 100755
index 0000000..a1aa561
--- /dev/null
+++ b/ldc_2d/cpp/generate.py
@@ -0,0 +1,24 @@
+#!/usr/bin/env python
+
+from boltzgen import LBM, Generator, Geometry
+from boltzgen.lbm.model import D2Q9
+
+geometry = Geometry(256, 256)
+
+functions = ['collide_and_stream', 'equilibrilize', 'collect_moments', 'momenta_boundary', 'example']
+extras    = ['omp_parallel_for', 'moments_vtk']
+
+precision = 'double'
+
+lbm = LBM(D2Q9)
+generator = Generator(
+    descriptor = D2Q9,
+    moments    = lbm.moments(),
+    collision  = lbm.bgk(f_eq = lbm.equilibrium(), tau = 0.52),
+    target     = 'cpp',
+    precision  = precision,
+    index      = 'XYZ',
+    layout     = 'AOS')
+
+with open("kernel.h", "w") as kernel:
+    kernel.write(generator.kernel(geometry, functions, extras))
diff --git a/ldc_2d/cpp/ldc_2d.cc b/ldc_2d/cpp/ldc_2d.cc
new file mode 100644
index 0000000..d519490
--- /dev/null
+++ b/ldc_2d/cpp/ldc_2d.cc
@@ -0,0 +1,12 @@
+#include <cstdint>
+#include <memory>
+#include <vector>
+#include <chrono>
+#include <iostream>
+#include <fstream>
+
+#include "kernel.h"
+
+int main() {
+	test_ldc(10000);
+}
diff --git a/ldc_2d/cpp/shell.nix b/ldc_2d/cpp/shell.nix
new file mode 100644
index 0000000..0b9db9f
--- /dev/null
+++ b/ldc_2d/cpp/shell.nix
@@ -0,0 +1,42 @@
+{ pkgs ? import <nixpkgs> { }, ... }:
+
+pkgs.stdenvNoCC.mkDerivation rec {
+  name = "boltzgen-env";
+  env = pkgs.buildEnv { name = name; paths = buildInputs; };
+
+  buildInputs = let
+    boltzgen = pkgs.python3.pkgs.buildPythonPackage rec {
+      pname = "boltzgen";
+      version = "0.1";
+
+      src = pkgs.fetchFromGitHub {
+        owner  = "KnairdA";
+        repo   = "boltzgen";
+        rev    = "v0.1.1";
+        sha256 = "03fv7krhgc43gfjill8wb4aafr8xi69i2yh9zr68knnmrkrb8vpi";
+      };
+
+      propagatedBuildInputs = with pkgs.python37Packages; [
+        sympy
+        numpy
+        Mako
+      ];
+
+      doCheck = false;
+    };
+
+    local-python = pkgs.python3.withPackages (python-packages: with python-packages; [
+      boltzgen
+    ]);
+
+  in [
+    local-python
+    pkgs.gcc9
+    pkgs.cmake
+  ];
+
+  shellHook = ''
+    export NIX_SHELL_NAME="${name}"
+    export PYTHONPATH="$PWD:$PYTHONPATH"
+  '';
+}
-- 
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