From 6c55d262edb28cbaf37988107e3ba51a2faa8f80 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Th=C3=A9ophile=20Bastian?= <contact@tobast.fr>
Date: Sun, 28 Jan 2018 23:03:57 +0100
Subject: [PATCH] Add parser for obj mesh format

---
 Makefile           |  3 ++-
 util/ObjParser.cpp | 32 ++++++++++++++++++++++++++++++++
 util/ObjParser.hpp | 16 ++++++++++++++++
 3 files changed, 50 insertions(+), 1 deletion(-)
 create mode 100644 util/ObjParser.cpp
 create mode 100644 util/ObjParser.hpp

diff --git a/Makefile b/Makefile
index 2074d0d..7b08b8f 100644
--- a/Makefile
+++ b/Makefile
@@ -7,7 +7,8 @@ CXXLIBS=
 TARGETS=
 
 OBJS=Implicit.o \
-	 Mesh.o
+	 Mesh.o \
+	 util/ObjParser.o
 
 all: $(TARGETS:=.bin)
 
diff --git a/util/ObjParser.cpp b/util/ObjParser.cpp
new file mode 100644
index 0000000..c62bfc1
--- /dev/null
+++ b/util/ObjParser.cpp
@@ -0,0 +1,32 @@
+#include "ObjParser.hpp"
+
+ObjParser::ObjParser(const std::string& path)
+    : path(path)
+{}
+
+Mesh ObjParser::parse() {
+    std::ifstream handle(path);
+    Mesh output;
+
+    if(!handle.is_open())
+       throw std::runtime_error(std::string("Cannot open the file ") + path);
+
+    while(!handle.eof()) {
+        char type;
+        handle >> type;
+        if(type == 'v') { // vertice
+            double x, y, z;
+            handle >> x >> y >> z;
+            output.add_vertice(Point(x, y, z));
+        }
+        else {
+            int v1, v2, v3;
+            handle >> v1 >> v2 >> v3;
+            output.add_face(Face(v1, v2, v3));
+        }
+
+        handle.ignore('\n');
+    }
+
+    return output;
+}
diff --git a/util/ObjParser.hpp b/util/ObjParser.hpp
new file mode 100644
index 0000000..5fa697b
--- /dev/null
+++ b/util/ObjParser.hpp
@@ -0,0 +1,16 @@
+/** Parses .obj mesh files, outputting a `Mesh` */
+
+#include <fstream>
+#include <string>
+#include <stdexcept>
+
+#include "../Mesh.hpp"
+
+class ObjParser {
+    public:
+        ObjParser(const std::string& path);
+        Mesh parse();
+
+    private:
+        std::string path;
+};