From cc6fb8c33637566a7b116d46440e6063f016deea Mon Sep 17 00:00:00 2001
From: vimene <vincent.menegaux@gmail.com>
Date: Tue, 31 Dec 2024 03:40:14 +0100
Subject: various improvements

- added quaternions and rewrote all rotations to use them
- added transforms to put all object transforms in a single place
- added Wavefront .obj file parser
- removed frame buffer's abstract class
- improved vectors, matrices, triangles, vertices and vertices data by putting all code in header file
- added vector's operations
- changed from NULL to nullptr
- miscellaneous improvements
---
 src/obj_parser.cpp | 81 ++++++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 81 insertions(+)
 create mode 100644 src/obj_parser.cpp

(limited to 'src/obj_parser.cpp')

diff --git a/src/obj_parser.cpp b/src/obj_parser.cpp
new file mode 100644
index 0000000..7791678
--- /dev/null
+++ b/src/obj_parser.cpp
@@ -0,0 +1,81 @@
+#include "obj_parser.h"
+
+#include <iostream>
+#include <fstream>
+#include <string>
+#include <vector>
+#include <cstddef>
+#include <array>
+#include "math/vector.h"
+#include "o3d/mesh.h"
+#include "o3d/vertex_data.h"
+
+namespace engine {
+
+namespace {
+
+std::vector<std::string> split(const std::string& s, char sep) {
+    std::vector<std::string> res;
+    std::string::size_type last_ind = 0;
+    for (std::string::size_type ind = 0; ind < s.length(); ind++) {
+        if (s[ind] == sep) {
+            res.push_back(s.substr(last_ind, ind - last_ind));
+            last_ind = ind + 1;
+        }
+    }
+    res.push_back(s.substr(last_ind));
+    return res;
+}
+
+}
+
+o3d::Mesh parse_object(const std::string& obj_path) {
+    o3d::Mesh mesh;
+    mesh.vertices_data.push_back(o3d::VertexData(0.f, 0.f));
+    std::ifstream obj_file(obj_path);
+    std::string line;
+    while (std::getline(obj_file, line)) {
+        if (line.length() == 0 || line[0] == '#')
+            continue;
+        if (line.rfind("o ", 0) == 0) {
+            std::cout << "Object: " << line.substr(2) << std::endl;
+        } else if (line.rfind("v ", 0) == 0) {
+            auto s_coords = split(line.substr(2), ' ');
+            math::Vector3 v{std::stof(s_coords[0]), std::stof(s_coords[1]), std::stof(s_coords[2])};
+            std::cout << "Vertex x: " << v.x << " y: " << v.y << " z: " << v.z << std::endl;
+            mesh.vertices.push_back(v);
+        } else if (line.rfind("vn ", 0) == 0) {
+            auto s_coords = split(line.substr(3), ' ');
+            math::Vector3 vn{std::stof(s_coords[0]), std::stof(s_coords[1]), std::stof(s_coords[2])};
+            std::cout << "Vertex normal x: " << vn.x << " y: " << vn.y << " z: " << vn.z << std::endl;
+            mesh.normals.push_back(vn);
+        } else if (line.rfind("s ", 0) == 0) {
+            auto smooth = false;
+            auto s_smooth = line.substr(2);
+            if (s_smooth == "0" || s_smooth == "off") {
+                smooth = false;
+            } else if (s_smooth == "1" || s_smooth == "on") {
+                smooth = true;
+            }
+            std::cout << "Smooth: " << std::boolalpha << smooth << std::endl;
+        } else if (line.rfind("f ", 0) == 0) {
+            std::array<std::array<std::size_t, 3>, 3> indices;
+            auto line_split = split(line.substr(2), ' ');
+            for (int i = 0; i < 3; i++) {
+                auto indices_s_group = split(line_split[i], '/');
+                indices[i][0] = std::stoi(indices_s_group[0]) - 1;
+                indices[i][1] = std::stoi(indices_s_group[2]) - 1;
+                indices[i][2] = 0;
+            }
+            std::cout << "Face:"
+                << " 1: vertex: " << indices[0][0] << " normal: " << indices[0][1]
+                << " 2: vertex: " << indices[1][0] << " normal: " << indices[1][1]
+                << " 3: vertex: " << indices[2][0] << " normal: " << indices[2][1]
+                << std::endl;
+            mesh.indices.push_back(indices);
+        }
+    }
+    return mesh;
+}
+
+}
-- 
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