Added OBJ suport

.vscode/settings.json

@@ -4,6 +4,77 @@
         "*.js": "javascript",
         "*.c": "c",
         "*.scene": "yaml",
-        "iostream": "cpp"
+        "iostream": "cpp",
+        "any": "cpp",
+        "array": "cpp",
+        "atomic": "cpp",
+        "bit": "cpp",
+        "*.tcc": "cpp",
+        "bitset": "cpp",
+        "cctype": "cpp",
+        "charconv": "cpp",
+        "chrono": "cpp",
+        "cinttypes": "cpp",
+        "clocale": "cpp",
+        "cmath": "cpp",
+        "compare": "cpp",
+        "concepts": "cpp",
+        "condition_variable": "cpp",
+        "cstdarg": "cpp",
+        "cstddef": "cpp",
+        "cstdint": "cpp",
+        "cstdio": "cpp",
+        "cstdlib": "cpp",
+        "cstring": "cpp",
+        "ctime": "cpp",
+        "cwchar": "cpp",
+        "cwctype": "cpp",
+        "deque": "cpp",
+        "forward_list": "cpp",
+        "list": "cpp",
+        "map": "cpp",
+        "set": "cpp",
+        "string": "cpp",
+        "unordered_map": "cpp",
+        "unordered_set": "cpp",
+        "vector": "cpp",
+        "exception": "cpp",
+        "algorithm": "cpp",
+        "functional": "cpp",
+        "iterator": "cpp",
+        "memory": "cpp",
+        "memory_resource": "cpp",
+        "numeric": "cpp",
+        "optional": "cpp",
+        "random": "cpp",
+        "ratio": "cpp",
+        "regex": "cpp",
+        "string_view": "cpp",
+        "system_error": "cpp",
+        "tuple": "cpp",
+        "type_traits": "cpp",
+        "utility": "cpp",
+        "format": "cpp",
+        "fstream": "cpp",
+        "initializer_list": "cpp",
+        "iomanip": "cpp",
+        "iosfwd": "cpp",
+        "istream": "cpp",
+        "limits": "cpp",
+        "mutex": "cpp",
+        "new": "cpp",
+        "numbers": "cpp",
+        "ostream": "cpp",
+        "semaphore": "cpp",
+        "shared_mutex": "cpp",
+        "span": "cpp",
+        "sstream": "cpp",
+        "stdexcept": "cpp",
+        "stop_token": "cpp",
+        "streambuf": "cpp",
+        "text_encoding": "cpp",
+        "thread": "cpp",
+        "typeinfo": "cpp",
+        "variant": "cpp"
     }
 }

Engine/Components/ModelComponent.cpp

@@ -1,183 +1,46 @@
 #include "ModelComponent.h"
 #include "stb_image.h"
+#define TINYOBJLOADER_IMPLEMENTATION
+#include "tiny_obj_loader.h"
+
 #include <iostream>
+#include <sstream>
+#include <map>
+#include <algorithm>
 
-// Constructor: initialize material defaults, create default cube mesh, and load default textures.
+// Constructor: initialize default values.
 ModelComponent::ModelComponent()
-    : diffuseColor(1.0f, 1.0f, 1.0f),
+    : modelPath("./assets/models/sponza.obj"),
+      diffuseColor(1.0f, 1.0f, 1.0f),
       specularColor(1.0f, 1.0f, 1.0f),
-      shininess(32.0f),
+      shininess(32.0f)
-      VAO(0), VBO(0), EBO(0),
-      diffuseTexture(0), normalTexture(0)
 {
-    // Clear any previous data.
+    // Load the model on construction.
-    vertices.clear();
+    LoadModel(modelPath);
-    indices.clear();
-
-    // Create 24 vertices for a cube.
-    // Front face (z = 0.5)
-    Vertex v;
-    v.Normal = glm::vec3(0, 0, 1);
-    v.Tangent = glm::vec3(1, 0, 0);
-    // Top-left
-    v.Position = glm::vec3(-0.5f,  0.5f, 0.5f);
-    v.TexCoords = glm::vec2(0.0f, 1.0f);
-    vertices.push_back(v);
-    // Bottom-left
-    v.Position = glm::vec3(-0.5f, -0.5f, 0.5f);
-    v.TexCoords = glm::vec2(0.0f, 0.0f);
-    vertices.push_back(v);
-    // Bottom-right
-    v.Position = glm::vec3( 0.5f, -0.5f, 0.5f);
-    v.TexCoords = glm::vec2(1.0f, 0.0f);
-    vertices.push_back(v);
-    // Top-right
-    v.Position = glm::vec3( 0.5f,  0.5f, 0.5f);
-    v.TexCoords = glm::vec2(1.0f, 1.0f);
-    vertices.push_back(v);
-
-    // Right face (x = 0.5)
-    v.Normal = glm::vec3(1, 0, 0);
-    v.Tangent = glm::vec3(0, 0, -1);
-    // Top-left
-    v.Position = glm::vec3(0.5f,  0.5f,  0.5f);
-    v.TexCoords = glm::vec2(0.0f, 1.0f);
-    vertices.push_back(v);
-    // Bottom-left
-    v.Position = glm::vec3(0.5f, -0.5f,  0.5f);
-    v.TexCoords = glm::vec2(0.0f, 0.0f);
-    vertices.push_back(v);
-    // Bottom-right
-    v.Position = glm::vec3(0.5f, -0.5f, -0.5f);
-    v.TexCoords = glm::vec2(1.0f, 0.0f);
-    vertices.push_back(v);
-    // Top-right
-    v.Position = glm::vec3(0.5f,  0.5f, -0.5f);
-    v.TexCoords = glm::vec2(1.0f, 1.0f);
-    vertices.push_back(v);
-
-    // Back face (z = -0.5)
-    v.Normal = glm::vec3(0, 0, -1);
-    v.Tangent = glm::vec3(-1, 0, 0);
-    // Top-left
-    v.Position = glm::vec3( 0.5f,  0.5f, -0.5f);
-    v.TexCoords = glm::vec2(0.0f, 1.0f);
-    vertices.push_back(v);
-    // Bottom-left
-    v.Position = glm::vec3( 0.5f, -0.5f, -0.5f);
-    v.TexCoords = glm::vec2(0.0f, 0.0f);
-    vertices.push_back(v);
-    // Bottom-right
-    v.Position = glm::vec3(-0.5f, -0.5f, -0.5f);
-    v.TexCoords = glm::vec2(1.0f, 0.0f);
-    vertices.push_back(v);
-    // Top-right
-    v.Position = glm::vec3(-0.5f,  0.5f, -0.5f);
-    v.TexCoords = glm::vec2(1.0f, 1.0f);
-    vertices.push_back(v);
-
-    // Left face (x = -0.5)
-    v.Normal = glm::vec3(-1, 0, 0);
-    v.Tangent = glm::vec3(0, 0, 1);
-    // Top-left
-    v.Position = glm::vec3(-0.5f,  0.5f, -0.5f);
-    v.TexCoords = glm::vec2(0.0f, 1.0f);
-    vertices.push_back(v);
-    // Bottom-left
-    v.Position = glm::vec3(-0.5f, -0.5f, -0.5f);
-    v.TexCoords = glm::vec2(0.0f, 0.0f);
-    vertices.push_back(v);
-    // Bottom-right
-    v.Position = glm::vec3(-0.5f, -0.5f,  0.5f);
-    v.TexCoords = glm::vec2(1.0f, 0.0f);
-    vertices.push_back(v);
-    // Top-right
-    v.Position = glm::vec3(-0.5f,  0.5f,  0.5f);
-    v.TexCoords = glm::vec2(1.0f, 1.0f);
-    vertices.push_back(v);
-
-    // Top face (y = 0.5)
-    v.Normal = glm::vec3(0, 1, 0);
-    v.Tangent = glm::vec3(1, 0, 0);
-    // Top-left
-    v.Position = glm::vec3(-0.5f, 0.5f, -0.5f);
-    v.TexCoords = glm::vec2(0.0f, 1.0f);
-    vertices.push_back(v);
-    // Bottom-left
-    v.Position = glm::vec3(-0.5f, 0.5f,  0.5f);
-    v.TexCoords = glm::vec2(0.0f, 0.0f);
-    vertices.push_back(v);
-    // Bottom-right
-    v.Position = glm::vec3( 0.5f, 0.5f,  0.5f);
-    v.TexCoords = glm::vec2(1.0f, 0.0f);
-    vertices.push_back(v);
-    // Top-right
-    v.Position = glm::vec3( 0.5f, 0.5f, -0.5f);
-    v.TexCoords = glm::vec2(1.0f, 1.0f);
-    vertices.push_back(v);
-
-    // Bottom face (y = -0.5)
-    v.Normal = glm::vec3(0, -1, 0);
-    v.Tangent = glm::vec3(1, 0, 0);
-    // Top-left
-    v.Position = glm::vec3(-0.5f, -0.5f,  0.5f);
-    v.TexCoords = glm::vec2(0.0f, 1.0f);
-    vertices.push_back(v);
-    // Bottom-left
-    v.Position = glm::vec3(-0.5f, -0.5f, -0.5f);
-    v.TexCoords = glm::vec2(0.0f, 0.0f);
-    vertices.push_back(v);
-    // Bottom-right
-    v.Position = glm::vec3( 0.5f, -0.5f, -0.5f);
-    v.TexCoords = glm::vec2(1.0f, 0.0f);
-    vertices.push_back(v);
-    // Top-right
-    v.Position = glm::vec3( 0.5f, -0.5f,  0.5f);
-    v.TexCoords = glm::vec2(1.0f, 1.0f);
-    vertices.push_back(v);
-
-    // Define indices: 6 faces, 2 triangles per face, 3 indices per triangle.
-    indices = {
-        0,  1,  2,  0,  2,  3,        // Front face
-        4,  5,  6,  4,  6,  7,        // Right face
-        8,  9, 10,  8, 10, 11,        // Back face
-        12, 13, 14, 12, 14, 15,        // Left face
-        16, 17, 18, 16, 18, 19,        // Top face
-        20, 21, 22, 20, 22, 23         // Bottom face
-    };
-
-    // Setup mesh with the new vertex/index data.
-    SetupMesh();
-
-    // Load default textures.
-    if(!LoadDiffuseTexture("./assets/bricks.png")) {
-         std::cout << "Warning: Failed to load default diffuse texture 'bricks.png'\n";
-    }
-    if(!LoadNormalTexture("./assets/normal.png")) {
-         std::cout << "Warning: Failed to load default normal texture 'normal.png'\n";
-    }
 }
 
 ModelComponent::~ModelComponent() {
-    if(VAO) glDeleteVertexArrays(1, &VAO);
+    // Clean up each submesh.
-    if(VBO) glDeleteBuffers(1, &VBO);
+    for (auto &mesh : meshes) {
-    if(EBO) glDeleteBuffers(1, &EBO);
+        if(mesh.VAO) glDeleteVertexArrays(1, &mesh.VAO);
-    if(diffuseTexture) glDeleteTextures(1, &diffuseTexture);
+        if(mesh.VBO) glDeleteBuffers(1, &mesh.VBO);
-    if(normalTexture) glDeleteTextures(1, &normalTexture);
+        if(mesh.EBO) glDeleteBuffers(1, &mesh.EBO);
+        if(mesh.diffuseTexture) glDeleteTextures(1, &mesh.diffuseTexture);
+    }
 }
 
-void ModelComponent::SetupMesh() {
+void ModelComponent::SetupMesh(SubMesh &mesh) {
-    glGenVertexArrays(1, &VAO);
+    glGenVertexArrays(1, &mesh.VAO);
-    glGenBuffers(1, &VBO);
+    glGenBuffers(1, &mesh.VBO);
-    glGenBuffers(1, &EBO);
+    glGenBuffers(1, &mesh.EBO);
     
-    glBindVertexArray(VAO);
+    glBindVertexArray(mesh.VAO);
     
-    glBindBuffer(GL_ARRAY_BUFFER, VBO);
+    glBindBuffer(GL_ARRAY_BUFFER, mesh.VBO);
-    glBufferData(GL_ARRAY_BUFFER, vertices.size() * sizeof(Vertex), &vertices[0], GL_STATIC_DRAW);
+    glBufferData(GL_ARRAY_BUFFER, mesh.vertices.size() * sizeof(Vertex), &mesh.vertices[0], GL_STATIC_DRAW);
     
-    glBindBuffer(GL_ELEMENT_ARRAY_BUFFER, EBO);
+    glBindBuffer(GL_ELEMENT_ARRAY_BUFFER, mesh.EBO);
-    glBufferData(GL_ELEMENT_ARRAY_BUFFER, indices.size() * sizeof(GLuint), &indices[0], GL_STATIC_DRAW);
+    glBufferData(GL_ELEMENT_ARRAY_BUFFER, mesh.indices.size() * sizeof(GLuint), &mesh.indices[0], GL_STATIC_DRAW);
     
     // Vertex attributes:
     // Positions.
@@ -196,16 +59,15 @@ void ModelComponent::SetupMesh() {
     glBindVertexArray(0);
 }
 
-// LoadDiffuseTexture loads a diffuse texture from file.
+bool ModelComponent::LoadDiffuseTexture(const std::string &filepath, GLuint &textureID) {
-bool ModelComponent::LoadDiffuseTexture(const std::string &filepath) {
     int w, h, channels;
     unsigned char* data = stbi_load(filepath.c_str(), &w, &h, &channels, 0);
     if (!data) {
         std::cout << "Failed to load diffuse texture: " << filepath << std::endl;
         return false;
     }
-    glGenTextures(1, &diffuseTexture);
+    glGenTextures(1, &textureID);
-    glBindTexture(GL_TEXTURE_2D, diffuseTexture);
+    glBindTexture(GL_TEXTURE_2D, textureID);
     GLenum format = (channels == 3) ? GL_RGB : GL_RGBA;
     glTexImage2D(GL_TEXTURE_2D, 0, format, w, h, 0, format, GL_UNSIGNED_BYTE, data);
     glGenerateMipmap(GL_TEXTURE_2D);
@@ -217,30 +79,133 @@ bool ModelComponent::LoadDiffuseTexture(const std::string &filepath) {
     return true;
 }
 
-// LoadNormalTexture loads a normal map texture from file.
 bool ModelComponent::LoadNormalTexture(const std::string &filepath) {
-    int w, h, channels;
+    // Similar to LoadDiffuseTexture but for normalTexture; not used in this submesh example.
-    unsigned char* data = stbi_load(filepath.c_str(), &w, &h, &channels, 0);
+    return true;
-    if (!data) {
+}
-        std::cout << "Failed to load normal texture: " << filepath << std::endl;
+
+// Loads a model using tiny_obj_loader and groups faces by material.
+bool ModelComponent::LoadModel(const std::string &filepath) {
+    modelPath = filepath;
+    tinyobj::attrib_t attrib;
+    std::vector<tinyobj::shape_t> shapes;
+    std::vector<tinyobj::material_t> materials;
+    std::string warn, err;
+
+    // Get the directory of the OBJ file.
+    std::string baseDir = "";
+    size_t lastSlash = filepath.find_last_of("/\\");
+    if (lastSlash != std::string::npos) {
+        baseDir = filepath.substr(0, lastSlash + 1);
+    }
+
+    bool ret = tinyobj::LoadObj(&attrib, &shapes, &materials, &warn, &err, filepath.c_str(), baseDir.c_str());
+    if (!warn.empty()) {
+        std::cout << "[Warning] " << warn << std::endl;
+    }
+    if (!err.empty()) {
+        std::cerr << "[Error] " << err << std::endl;
+    }
+    if (!ret) {
+        std::cerr << "[Error] Failed to load/parse OBJ file: " << filepath << std::endl;
         return false;
     }
-    glGenTextures(1, &normalTexture);
+
-    glBindTexture(GL_TEXTURE_2D, normalTexture);
+    // Clear any existing submeshes.
-    GLenum format = (channels == 3) ? GL_RGB : GL_RGBA;
+    meshes.clear();
-    glTexImage2D(GL_TEXTURE_2D, 0, format, w, h, 0, format, GL_UNSIGNED_BYTE, data);
+
-    glGenerateMipmap(GL_TEXTURE_2D);
+    // For each shape in the OBJ file.
-    glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_REPEAT);
+    for (size_t s = 0; s < shapes.size(); s++) {
-    glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_REPEAT);
+        // Use a map to group faces by material ID.
-    glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR_MIPMAP_LINEAR);
+        std::map<int, SubMesh> submeshMap;
-    glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR);
+        size_t index_offset = 0;
-    stbi_image_free(data);
+        // Iterate over each face.
+        for (size_t f = 0; f < shapes[s].mesh.num_face_vertices.size(); f++) {
+            std::cout << "[Info] AssetManager: Loading Mesh: "<< i << std::endl;
+            int fv = shapes[s].mesh.num_face_vertices[f];
+            // Get material ID for this face.
+            int matID = -1;
+            if (shapes[s].mesh.material_ids.size() > f)
+                matID = shapes[s].mesh.material_ids[f];
+            // If submesh for this material does not exist, create it.
+            if (submeshMap.find(matID) == submeshMap.end())
+                submeshMap[matID] = SubMesh();
+            
+            SubMesh &currentMesh = submeshMap[matID];
+            // Process each vertex in the face.
+            for (size_t v = 0; v < fv; v++) {
+                tinyobj::index_t idx = shapes[s].mesh.indices[index_offset + v];
+                Vertex vertex;
+                // Position.
+                vertex.Position = glm::vec3(
+                    attrib.vertices[3 * idx.vertex_index + 0],
+                    attrib.vertices[3 * idx.vertex_index + 1],
+                    attrib.vertices[3 * idx.vertex_index + 2]
+                );
+                // Normal.
+                if (idx.normal_index >= 0 && 3 * idx.normal_index + 2 < attrib.normals.size()) {
+                    vertex.Normal = glm::vec3(
+                        attrib.normals[3 * idx.normal_index + 0],
+                        attrib.normals[3 * idx.normal_index + 1],
+                        attrib.normals[3 * idx.normal_index + 2]
+                    );
+                } else {
+                    vertex.Normal = glm::vec3(0.0f);
+                }
+                // Texture Coordinates.
+                if (idx.texcoord_index >= 0 && 2 * idx.texcoord_index + 1 < attrib.texcoords.size()) {
+                    vertex.TexCoords = glm::vec2(
+                        attrib.texcoords[2 * idx.texcoord_index + 0],
+                        attrib.texcoords[2 * idx.texcoord_index + 1]
+                    );
+                } else {
+                    vertex.TexCoords = glm::vec2(0.0f);
+                }
+                // Tangent not provided.
+                vertex.Tangent = glm::vec3(0.0f);
+                
+                // Add vertex and index.
+                currentMesh.vertices.push_back(vertex);
+                currentMesh.indices.push_back(static_cast<GLuint>(currentMesh.vertices.size() - 1));
+            }
+            index_offset += fv;
+        }
+
+        // For each group (submesh) in this shape, set material properties and create buffers.
+        for (auto &pair : submeshMap) {
+            int matID = pair.first;
+            SubMesh &subMesh = pair.second;
+            // If there is a valid material, assign its properties.
+            if (matID >= 0 && matID < static_cast<int>(materials.size())) {
+                tinyobj::material_t mat = materials[matID];
+                subMesh.diffuseColor = glm::vec3(mat.diffuse[0], mat.diffuse[1], mat.diffuse[2]);
+                subMesh.specularColor = glm::vec3(mat.specular[0], mat.specular[1], mat.specular[2]);
+                subMesh.shininess = mat.shininess;
+                if (!mat.diffuse_texname.empty()) {
+                    std::string texturePath = baseDir + mat.diffuse_texname;
+                    LoadDiffuseTexture(texturePath, subMesh.diffuseTexture);
+                }
+            }
+            // Setup the OpenGL buffers for this submesh.
+            SetupMesh(subMesh);
+            // Add submesh to our model.
+            meshes.push_back(subMesh);
+        }
+    }
+
     return true;
 }
 
-// Draw the mesh using its VAO.
+// Draws the entire model by drawing each submesh.
 void ModelComponent::Draw() {
-    glBindVertexArray(VAO);
+    for (auto &mesh : meshes) {
-    glDrawElements(GL_TRIANGLES, static_cast<GLsizei>(indices.size()), GL_UNSIGNED_INT, 0);
+        // Bind the appropriate texture if available.
+        if(mesh.diffuseTexture) {
+            glActiveTexture(GL_TEXTURE0);
+            glBindTexture(GL_TEXTURE_2D, mesh.diffuseTexture);
+        }
+        glBindVertexArray(mesh.VAO);
+        glDrawElements(GL_TRIANGLES, static_cast<GLsizei>(mesh.indices.size()), GL_UNSIGNED_INT, 0);
         glBindVertexArray(0);
+    }
 }

Engine/Components/ModelComponent.h

@@ -14,36 +14,50 @@ struct Vertex {
     glm::vec3 Tangent;
 };
 
+// Structure representing a sub-mesh (a group of faces sharing the same material)
+struct SubMesh {
+    std::vector<Vertex> vertices;
+    std::vector<GLuint> indices;
+    glm::vec3 diffuseColor;
+    glm::vec3 specularColor;
+    float shininess;
+    GLuint diffuseTexture;
+    GLuint VAO, VBO, EBO;
+
+    SubMesh()
+        : diffuseColor(1.0f,1.0f,1.0f),
+          specularColor(1.0f,1.0f,1.0f),
+          shininess(32.0f),
+          diffuseTexture(0),
+          VAO(0), VBO(0), EBO(0)
+    {}
+};
+
 class ModelComponent {
 public:
     ModelComponent();
     ~ModelComponent();
 
-    // Material properties.
+    // Base model path.
+    std::string modelPath;
+    // Submeshes
+    std::vector<SubMesh> meshes;
+
+    // Functions.
+    bool LoadModel(const std::string &filepath);
+    void Draw();
+
+    // Texture loading.
+    bool LoadDiffuseTexture(const std::string &filepath, GLuint &textureID);
+    bool LoadNormalTexture(const std::string &filepath);
+    
+    // Setup mesh for a submesh.
+    void SetupMesh(SubMesh &mesh);
+    
+    // (Optional) Global material properties if needed.
     glm::vec3 diffuseColor;
     glm::vec3 specularColor;
     float shininess;
-
-    // Mesh data.
-    std::vector<Vertex> vertices;
-    std::vector<GLuint> indices;
-
-    // OpenGL buffers.
-    GLuint VAO, VBO, EBO;
-
-    // Texture handles.
-    GLuint diffuseTexture;
-    GLuint normalTexture;
-
-    // Set up the mesh by creating VAO, VBO, and EBO.
-    void SetupMesh();
-
-    // Load textures from file.
-    bool LoadDiffuseTexture(const std::string &filepath);
-    bool LoadNormalTexture(const std::string &filepath);
-
-    // Draw the mesh.
-    void Draw();
 };
 
 #endif // MODEL_COMPONENT_H

Makefile

@@ -1,12 +1,12 @@
 # Compiler and flags
 CXX := g++
-CXXFLAGS := -std=c++20 -Wall -Wextra -O2 -I/c/msys64/mingw64/include -Ivendor/imgui-docking -Ivendor/stb
+CXXFLAGS := -std=c++20 -Wall -Wextra -O2 -I/c/msys64/mingw64/include -Ivendor/imgui-docking -Ivendor/stb -Ivendor/tini_obj 
 
 # Use this to link against the correct import lib
 LDFLAGS := -Llib -lglfw3 -lopengl32 -lglew32 -lglu32
 
 # Source and build directories (including vendor folder)
-SRC_DIRS := . Editor Engine vendor/imgui-docking Engine/Components Engine/Entity
+SRC_DIRS := . Editor Engine vendor/imgui-docking Engine/Components Engine/Entity Engine/utils
 BUILD_DIR := build
 
 # Find all source files

assets/models/sponza.mtl

@@ -0,0 +1,306 @@
+# Blender MTL File: 'None'
+# Material Count: 25
+
+newmtl Material__25
+Ns 7.843137
+Ka 0.000000 0.000000 0.000000
+Kd 0.470400 0.470400 0.470400
+Ks 0.000000 0.000000 0.000000
+Ni 1.000000
+d 0.000000
+illum 2
+map_Kd textures/lion.tga
+map_Disp textures/lion_ddn.tga
+map_Ka textures/lion.tga
+
+newmtl Material__298
+Ns 7.843137
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