loading obj files working.

still bad tho. we leak a-lot. idrc it's a testing repo.

.gitea/workflows/nix-check.yaml

@@ -8,4 +8,6 @@ jobs:
     steps:
       - uses: actions/checkout@v4
       - uses: cachix/install-nix-action@v30
+        with:
+          nix_path: nixpkgs=channel:nixos-24.11
       - run: nix-shell shell.nix --run make

headers/camera.hpp

@@ -7,9 +7,14 @@ public:
   Camera(glm::vec3 pos, float yaw, float pitch, float fov, float aspect);
   ~Camera();
   void setPos(glm::vec3 pos);
+  void addPos(glm::vec3 pos);
+  void addFPos(glm::vec3 pos);
   void setRotate(float yaw, float pitch);
+  void addRotate(float yaw, float pitch);
+  glm::vec3 getPos();
   glm::mat4 getView();
   glm::mat4 getProjection();
+  float aspect;
 
 private:
   void update();
@@ -20,6 +25,5 @@ private:
   float yaw;
   float pitch;
   float fov;
-  float aspect;
 };
 #endif

headers/mesh.hpp

@@ -0,0 +1,31 @@
+#ifndef MESH_H
+#define MESH_H
+#include "camera.hpp"
+#include "shader.hpp"
+#include <glm/glm.hpp>
+#include <glm/gtc/quaternion.hpp>
+
+class Mesh {
+public:
+  Mesh(Shader *s, unsigned int VAO, int count);
+  Mesh(Shader *s, std::string path);
+  ~Mesh();
+  void draw(Camera *c);
+  void setPosition(glm::vec3 p);
+  void setScale(glm::vec3 s);
+  void setRotation(glm::quat r);
+  void setOwnedBuffers(bool o);
+  void setOwnedShader(bool o);
+  Shader *getShader();
+
+private:
+  bool buffersOwned;
+  bool shaderOwned;
+  int count;
+  unsigned int VAO;
+  Shader *shader;
+  glm::vec3 position; /*0,0,0*/
+  glm::vec3 scale;    /*1,1,1*/
+  glm::quat rotation; /*1,0,0,0*/
+};
+#endif

headers/obj.hpp

@@ -0,0 +1,4 @@
+#include <glm/glm.hpp>
+#include <vector>
+
+unsigned int loadOBJ(const char *path, std::vector<float> *out_vertices);

headers/shader.hpp

@@ -11,6 +11,7 @@ public:
   void use();
   void setInt(const std::string &name, int value);
   void setFloat(const std::string &name, float value);
+  void setVec3(const std::string &name, glm::vec3 value);
   void setMat4(const std::string &name, glm::mat4 value);
 
 private:

headers/shapes.h

@@ -75,6 +75,50 @@ float cube_vertices[] = {
     -0.5f, 0.5f,  -0.5f, 0.0f, 1.0f  /**/
 };
 
+float uvcube[] = {
+  -0.5f, -0.5f, -0.5f,  0.0f,  0.0f, -1.0f,
+  0.5f, -0.5f, -0.5f,  0.0f,  0.0f, -1.0f,
+  0.5f,  0.5f, -0.5f,  0.0f,  0.0f, -1.0f,
+  0.5f,  0.5f, -0.5f,  0.0f,  0.0f, -1.0f,
+  -0.5f,  0.5f, -0.5f,  0.0f,  0.0f, -1.0f,
+  -0.5f, -0.5f, -0.5f,  0.0f,  0.0f, -1.0f,
+
+  -0.5f, -0.5f,  0.5f,  0.0f,  0.0f, 1.0f,
+  0.5f, -0.5f,  0.5f,  0.0f,  0.0f, 1.0f,
+  0.5f,  0.5f,  0.5f,  0.0f,  0.0f, 1.0f,
+  0.5f,  0.5f,  0.5f,  0.0f,  0.0f, 1.0f,
+  -0.5f,  0.5f,  0.5f,  0.0f,  0.0f, 1.0f,
+  -0.5f, -0.5f,  0.5f,  0.0f,  0.0f, 1.0f,
+
+  -0.5f,  0.5f,  0.5f, -1.0f,  0.0f,  0.0f,
+  -0.5f,  0.5f, -0.5f, -1.0f,  0.0f,  0.0f,
+  -0.5f, -0.5f, -0.5f, -1.0f,  0.0f,  0.0f,
+  -0.5f, -0.5f, -0.5f, -1.0f,  0.0f,  0.0f,
+  -0.5f, -0.5f,  0.5f, -1.0f,  0.0f,  0.0f,
+  -0.5f,  0.5f,  0.5f, -1.0f,  0.0f,  0.0f,
+
+  0.5f,  0.5f,  0.5f,  1.0f,  0.0f,  0.0f,
+  0.5f,  0.5f, -0.5f,  1.0f,  0.0f,  0.0f,
+  0.5f, -0.5f, -0.5f,  1.0f,  0.0f,  0.0f,
+  0.5f, -0.5f, -0.5f,  1.0f,  0.0f,  0.0f,
+  0.5f, -0.5f,  0.5f,  1.0f,  0.0f,  0.0f,
+  0.5f,  0.5f,  0.5f,  1.0f,  0.0f,  0.0f,
+
+  -0.5f, -0.5f, -0.5f,  0.0f, -1.0f,  0.0f,
+  0.5f, -0.5f, -0.5f,  0.0f, -1.0f,  0.0f,
+  0.5f, -0.5f,  0.5f,  0.0f, -1.0f,  0.0f,
+  0.5f, -0.5f,  0.5f,  0.0f, -1.0f,  0.0f,
+  -0.5f, -0.5f,  0.5f,  0.0f, -1.0f,  0.0f,
+  -0.5f, -0.5f, -0.5f,  0.0f, -1.0f,  0.0f,
+
+  -0.5f,  0.5f, -0.5f,  0.0f,  1.0f,  0.0f,
+  0.5f,  0.5f, -0.5f,  0.0f,  1.0f,  0.0f,
+  0.5f,  0.5f,  0.5f,  0.0f,  1.0f,  0.0f,
+  0.5f,  0.5f,  0.5f,  0.0f,  1.0f,  0.0f,
+  -0.5f,  0.5f,  0.5f,  0.0f,  1.0f,  0.0f,
+  -0.5f,  0.5f, -0.5f,  0.0f,  1.0f,  0.0f
+};
+
 const char *basicVertexShaderSource =
     "#version 330 core\n"
     "layout (location = 0) in vec3 aPos;\n"

shaders/MVPTexNoRGBVert.glsl

@@ -0,0 +1,15 @@
+#version 330 core
+layout (location = 0) in vec3 aPos;
+layout (location = 1) in vec2 aTexCoord;
+
+out vec2 TexCoord;
+
+uniform mat4 model;
+uniform mat4 view;
+uniform mat4 projection;
+
+void main()
+{
+    gl_Position = projection * view * model * vec4(aPos, 1.0);
+    TexCoord = aTexCoord;
+}

shaders/TexNoRGBFrag.glsl

@@ -0,0 +1,12 @@
+#version 330 core
+out vec4 FragColor;
+
+in vec3 ourColor;
+in vec2 TexCoord;
+
+uniform sampler2D tex0;
+
+void main()
+{
+    FragColor = texture(tex0, TexCoord);
+}

shaders/lighting/Frag.glsl

@@ -0,0 +1,50 @@
+#version 330 core
+struct Material {
+  vec3 ambient;
+  vec3 diffuse;
+  vec3 specular;
+  float shininess;
+};
+
+
+struct Light {
+    vec3 position;
+    vec3 ambient;
+    vec3 diffuse;
+    vec3 specular;
+};
+
+
+out vec4 FragColor;
+
+in vec3 FragPos;
+in vec3 Normal;
+
+uniform vec3 ourColor;
+uniform vec3 viewPos;
+uniform Material material;
+uniform Light light;
+
+void main()
+{
+  //misc
+  vec3 norm = normalize(Normal);
+  vec3 lightDir = normalize(light.position - FragPos);
+
+  // ambient
+  vec3 ambient = light.ambient * material.ambient;
+
+  // diffuse
+  float diff = max(dot(norm, lightDir), 0.0);
+  vec3 diffuse = light.diffuse * (diff * material.diffuse);
+
+  // specular
+  vec3 viewDir = normalize(viewPos - FragPos);
+  vec3 reflectDir = reflect(-lightDir, norm);
+  float spec = pow(max(dot(viewDir, reflectDir), 0.0), material.shininess);
+  vec3 specular = light.specular * (spec * material.specular);
+
+  //out
+  vec3 result = ambient + diffuse + specular;
+  FragColor = vec4(result, 1.0);
+}

shaders/lighting/LightFrag.glsl

@@ -0,0 +1,9 @@
+#version 330 core
+out vec4 FragColor;
+
+uniform vec3 ourColor;
+
+void main()
+{
+  FragColor = vec4(ourColor, 1.0);
+}

shaders/lighting/Vert.glsl

@@ -0,0 +1,18 @@
+#version 330 core
+layout (location = 0) in vec3 aPos;
+layout (location = 1) in vec3 aNormal;
+
+out vec3 FragPos;
+out vec3 Normal;
+
+uniform mat4 model;
+uniform mat4 view;
+uniform mat4 projection;
+
+void main()
+{
+  gl_Position = projection * view * model * vec4(aPos, 1.0);
+  FragPos = vec3(model * vec4(aPos, 1.0));
+  Normal = aNormal;
+  //Normal = mat3(transpose(inverse(model))) * aNormal;//if non unifrom scale
+}

src/camera.cpp

@@ -3,8 +3,8 @@
 #include <glm/ext/matrix_transform.hpp>
 
 Camera::Camera(glm::vec3 pos, float yaw, float pitch, float fov, float aspect)
-    : up(glm::vec3(0, 1, 0)), pos(pos), yaw(yaw), pitch(pitch), fov(fov),
+    : aspect(aspect), up(glm::vec3(0, 1, 0)), pos(pos), yaw(yaw), pitch(pitch),
-      aspect(aspect) {
+      fov(fov) {
   update();
 }
 
@@ -16,8 +16,28 @@ void Camera::setRotate(float yaw, float pitch) {
   update();
 }
 
+void Camera::addRotate(float yaw, float pitch) {
+  this->yaw += yaw;
+  this->pitch += pitch;
+  if (this->pitch > 89.0f)
+    this->pitch = 89.0f;
+  if (this->pitch < -89.0f)
+    this->pitch = -89.0f;
+  update();
+}
+
 void Camera::setPos(glm::vec3 pos) { this->pos = pos; }
 
+void Camera::addPos(glm::vec3 pos) { this->pos += pos; }
+
+void Camera::addFPos(glm::vec3 pos) {
+  glm::vec3 f = glm::normalize(glm::vec3(front.x, 0, front.z));
+  glm::vec3 r = glm::normalize(glm::cross(f, up));
+  this->pos += f * pos.x;
+  this->pos += up * pos.y;
+  this->pos += r * pos.z;
+}
+
 void Camera::update() {
   glm::vec3 direction;
   direction.x = cos(glm::radians(yaw)) * cos(glm::radians(pitch));
@@ -32,6 +52,8 @@ glm::mat4 Camera::getView() {
   return view;
 }
 
+glm::vec3 Camera::getPos() { return pos; }
+
 glm::mat4 Camera::getProjection() {
   return glm::perspective(glm::radians(fov), aspect, 0.1f, 100.0f);
 }

src/main.cpp

@@ -1,27 +1,21 @@
-#include <glad/glad.h> /*Must be before GLFW*/
 #include "camera.hpp"
+#include "glad/glad.h"
 #include <GLFW/glfw3.h>
 #include <cassert>
 #include <glm/glm.hpp>
-#include <glm/gtc/matrix_transform.hpp>
+#include <mesh.hpp>
-#include <glm/gtc/type_ptr.hpp>
 #include <shader.hpp>
-#include <shapes.h>
 #include <texture.hpp>
 
 #define UNUSED(x) (void)(x)
 
-void processInput(GLFWwindow *window);
+glm::vec3 processInput(GLFWwindow *window);
 void framebuffer_size_callback(GLFWwindow *window, int width, int height);
+void mouse_callback(GLFWwindow *window, double xpos, double ypos);
 
-glm::vec3 cubePositions[] = {
+float deltaTime = 0;
-    glm::vec3(0.0f, 0.0f, 0.0f),    glm::vec3(2.0f, 5.0f, -15.0f),
-    glm::vec3(-1.5f, -2.2f, -2.5f), glm::vec3(-3.8f, -2.0f, -12.3f),
-    glm::vec3(2.4f, -0.4f, -3.5f),  glm::vec3(-1.7f, 3.0f, -7.5f),
-    glm::vec3(1.3f, -2.0f, -2.5f),  glm::vec3(1.5f, 2.0f, -2.5f),
-    glm::vec3(1.5f, 0.2f, -1.5f),   glm::vec3(-1.3f, 1.0f, -1.5f)};
 
-int main(void) {
+GLFWwindow *init() {
   glfwInit();
   glfwWindowHint(GLFW_CONTEXT_VERSION_MAJOR, 3);
   glfwWindowHint(GLFW_CONTEXT_VERSION_MINOR, 3);
@@ -34,79 +28,133 @@ int main(void) {
   int is_ok = 0;
   is_ok = gladLoadGLLoader((GLADloadproc)glfwGetProcAddress);
   assert(is_ok && "Failed to init glad");
+  glfwSetInputMode(window, GLFW_CURSOR, GLFW_CURSOR_DISABLED);
 
   glViewport(0, 0, 800, 600);
   glfwSetFramebufferSizeCallback(window, framebuffer_size_callback);
+  glfwSetCursorPosCallback(window, mouse_callback);
+  return window;
+}
 
-  unsigned int VBO, VAO;
+void showFPS(GLFWwindow *window, double delta) {
-  glGenVertexArrays(1, &VAO);
+  char title[22];
-  glBindVertexArray(VAO);
+  title[21] = '\0';
+  snprintf(title, 20, "OpenGl FPS: [%3.2f]", (1 / delta));
+  glfwSetWindowTitle(window, title);
+}
 
-  glGenBuffers(1, &VBO);
+int main(void) {
-  glBindBuffer(GL_ARRAY_BUFFER, VBO);
+  glm::vec3 lightPos = glm::vec3(1, 2.0f, 1);
-  glBufferData(GL_ARRAY_BUFFER, sizeof(cube_vertices), cube_vertices,
+  glm::vec3 lightColor = glm::vec3(1);
-               GL_STATIC_DRAW);
 
-  glVertexAttribPointer(0, 3, GL_FLOAT, GL_FALSE, 5 * sizeof(float), (void *)0);
+  GLFWwindow *window = init();
-  glVertexAttribPointer(1, 3, GL_FLOAT, GL_FALSE, 5 * sizeof(float), (void *)0);
+  Camera *cam = new Camera(glm::vec3(0), 0, 0, 45, 800.0 / 600);
-  glVertexAttribPointer(2, 2, GL_FLOAT, GL_FALSE, 5 * sizeof(float),
+  glfwSetWindowUserPointer(window, cam);
-                        (void *)(3 * sizeof(float)));
 
-  glEnableVertexAttribArray(0); /*pos*/
+  Shader *cubeShader = new Shader("./shaders/lighting/Vert.glsl",
-  glEnableVertexAttribArray(1); /*rgb*/
+                                  "./shaders/lighting/Frag.glsl");
-  glEnableVertexAttribArray(2); /*tex_cord*/
+  Shader *lightShader = new Shader("./shaders/lighting/Vert.glsl",
+                                   "./shaders/lighting/LightFrag.glsl");
 
-  Shader *shaderProgram =
+  Mesh *cube = new Mesh(cubeShader, "./cube.obj");
-    new Shader("./shaders/MVPTexVert.glsl", "./shaders/TexFrag.glsl");
+  Mesh *light = new Mesh(lightShader, "./cube.obj");
+  cube->setOwnedShader(true);
+  light->setOwnedShader(true);
 
-  Texture *texture = new Texture(GL_TEXTURE_2D, "./texture/container.jpg");
+  light->setPosition(lightPos);
-
+  light->setScale(glm::vec3(.3));
-  Camera *cam = new Camera(glm::vec3(0.0, 0.0, 5.0),-90.0f, 0.0f,45.0,800.0/600);
 
+  glEnable(GL_DEPTH_TEST);
+  float lastFrame = 0;
   while (!glfwWindowShouldClose(window)) {
+    float currentFrame = (float)glfwGetTime();
+    deltaTime = currentFrame - lastFrame;
+    lastFrame = currentFrame;
+    showFPS(window, deltaTime);
 
     glClearColor(0.2f, 0.3f, 0.3f, 1.0f);
     glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
 
-    shaderProgram->use();
+    Shader *s = cube->getShader();
-    shaderProgram->setInt("Tex0", 0);
+    s->use();
-    shaderProgram->setMat4("view", cam->getView());
+    s->setVec3("lightColor", lightColor);
-    shaderProgram->setMat4("projection", cam->getProjection());
+    s->setVec3("ourColor", glm::vec3(0.24725, 0.1995, 0.0745));
-    texture->bind(GL_TEXTURE0);
+    s->setVec3("lightPos", lightPos);
+    s->setVec3("viewPos", cam->getPos());
 
-    glBindVertexArray(VAO);
+    s->setVec3("light.ambient", glm::vec3(0.2));
-    glEnable(GL_DEPTH_TEST);
+    s->setVec3("light.diffuse", glm::vec3(0.5));
+    s->setVec3("light.specular", glm::vec3(1));
+    s->setVec3("light.position", lightPos);
 
-    for (unsigned int i = 0; i < 10; i++) {
+    s->setVec3("material.ambient", glm::vec3(1.0, 0.5, 0.31));
-      glm::mat4 model = glm::mat4(1.0f);
+    s->setVec3("material.diffuse", glm::vec3(1.0, 0.5, 0.31));
-      model = glm::translate(model, cubePositions[i]);
+    s->setVec3("material.specular", glm::vec3(0.5));
+    s->setFloat("material.shininess", 32);
+    cube->draw(cam);
 
-      float angle = 20.0f * i;
+    s = light->getShader();
-      model =
+    s->use();
-          glm::rotate(model, glm::radians(angle), glm::vec3(1.0f, 0.3f, 0.5f));
+    s->setVec3("ourColor", lightColor);
-      model = glm::rotate(model, (float)glfwGetTime() * glm::radians(55.0f),
+    light->draw(cam);
-                          glm::vec3(1.0f, 0.5f, 0.0f));
-
-      shaderProgram->setMat4("model", model);
-      glDrawArrays(GL_TRIANGLES, 0, 36);
-    }
 
     glfwSwapBuffers(window);
     glfwPollEvents();
-    processInput(window);
+    glm::vec3 mov = processInput(window);
+    mov *= deltaTime;
+    cam->addFPos(mov);
   }
 
-  delete (shaderProgram);
+  delete cam;
+  delete cube;
+  delete light;
   glfwTerminate();
   return 0;
 }
 
-void processInput(GLFWwindow *window) {
+glm::vec3 processInput(GLFWwindow *window) {
+  glm::vec3 mov = glm::vec3(0);
   if (glfwGetKey(window, GLFW_KEY_ESCAPE) == GLFW_PRESS)
     glfwSetWindowShouldClose(window, true);
+
+  if (glfwGetKey(window, GLFW_KEY_W) == GLFW_PRESS)
+    mov += glm::vec3(1, 0, 0);
+  if (glfwGetKey(window, GLFW_KEY_S) == GLFW_PRESS)
+    mov -= glm::vec3(1, 0, 0);
+  if (glfwGetKey(window, GLFW_KEY_D) == GLFW_PRESS)
+    mov += glm::vec3(0, 0, 1);
+  if (glfwGetKey(window, GLFW_KEY_A) == GLFW_PRESS)
+    mov -= glm::vec3(0, 0, 1);
+  if (glfwGetKey(window, GLFW_KEY_Q) == GLFW_PRESS)
+    mov += glm::vec3(0, 1, 0);
+  if (glfwGetKey(window, GLFW_KEY_E) == GLFW_PRESS)
+    mov -= glm::vec3(0, 1, 0);
+
+  mov *= 5;
+  return mov;
 }
 
 void framebuffer_size_callback(GLFWwindow *window, int width, int height) {
   UNUSED(window);
   glViewport(0, 0, width, height);
+  Camera *cam = (Camera *)glfwGetWindowUserPointer(window);
+  if (cam)
+    cam->aspect = (float)width / height;
+}
+
+void mouse_callback(GLFWwindow *window, double xpos, double ypos) {
+  static float xprev = 0.0, yprev = 0.0;
+
+  float xchange = xpos - xprev;
+  float ychange = yprev - ypos;
+  xprev = xpos;
+  yprev = ypos;
+
+  float sensitivity = 0.1f;
+  xchange *= sensitivity;
+  ychange *= sensitivity;
+
+  Camera *cam = (Camera *)glfwGetWindowUserPointer(window);
+  if (cam)
+    cam->addRotate(xchange, ychange);
 }

src/mesh.cpp

@@ -0,0 +1,78 @@
+#include "camera.hpp"
+#include "obj.hpp"
+#include "shader.hpp"
+#include <mesh.hpp>
+#include <vector>
+
+unsigned int meshInit(std::string path, std::vector<float> &data);
+
+Mesh::Mesh(Shader *s, unsigned int VAO, int count)
+    : buffersOwned(false), shaderOwned(false), count(count), VAO(VAO),
+      shader(s), position(glm::vec3(0)), scale(glm::vec3(1)),
+      rotation(glm::quat(1.0f, 0.0f, 0.0f, 0.0f)) {}
+
+Mesh::Mesh(Shader *s, std::string path)
+    : buffersOwned(true), shaderOwned(false), shader(s), position(glm::vec3(0)),
+      scale(glm::vec3(1)), rotation(glm::quat(1.0f, 0.0f, 0.0f, 0.0f)) {
+  std::vector<float> data;
+  VAO = meshInit(path, data);
+  count = data.size() / 8;
+}
+
+Mesh::~Mesh() {
+  if (shaderOwned)
+    delete shader;
+  if (buffersOwned) {
+    glDeleteVertexArrays(1, &VAO);
+    // TODO vbo, ibo
+  }
+}
+
+void Mesh::draw(Camera *c) {
+  glm::mat4 model = glm::mat4(1);
+  glBindVertexArray(VAO);
+  shader->use();
+  shader->setMat4("view", c->getView());
+  shader->setMat4("projection", c->getProjection());
+  model = glm::translate(model, position);
+  model = glm::scale(model, scale);
+  model = model * glm::mat4_cast(rotation);
+  shader->setMat4("model", model);
+  glDrawArrays(GL_TRIANGLES, 0, count);
+}
+
+void Mesh::setPosition(glm::vec3 p) { position = p; }
+
+void Mesh::setScale(glm::vec3 s) { scale = s; }
+
+void Mesh::setRotation(glm::quat r) { rotation = r; }
+
+void Mesh::setOwnedBuffers(bool o) { buffersOwned = o; }
+
+void Mesh::setOwnedShader(bool o) { shaderOwned = o; }
+
+Shader *Mesh::getShader() { return shader; }
+
+unsigned int meshInit(std::string path, std::vector<float> &data) {
+  unsigned int VBO, VAO;
+  glGenVertexArrays(1, &VAO);
+  glBindVertexArray(VAO);
+
+  glGenBuffers(1, &VBO);
+  glBindBuffer(GL_ARRAY_BUFFER, VBO);
+
+  loadOBJ(path.c_str(), &data);
+  glBufferData(GL_ARRAY_BUFFER, data.size() * sizeof(float), data.data(),
+               GL_STATIC_DRAW);
+  glVertexAttribPointer(0, 3, GL_FLOAT, GL_FALSE, 8 * sizeof(float), (void *)0);
+  glVertexAttribPointer(1, 3, GL_FLOAT, GL_FALSE, 8 * sizeof(float),
+                        (void *)(3 * sizeof(float)));
+  glVertexAttribPointer(2, 2, GL_FLOAT, GL_FALSE, 8 * sizeof(float),
+                        (void *)(6 * sizeof(float)));
+
+  glEnableVertexAttribArray(0);
+  glEnableVertexAttribArray(1);
+  glEnableVertexAttribArray(2); // not in use
+  glBindVertexArray(0);
+  return VAO;
+}

src/obj.cpp

@@ -0,0 +1,66 @@
+#include "obj.hpp"
+#include <cassert>
+#include <cstddef>
+#include <cstdio>
+#include <cstring>
+
+/*this is ugly but works*/
+unsigned int loadOBJ(const char *path, std::vector<float> *out_vertices) {
+  std::vector<glm::vec3> verts, norms;
+  std::vector<glm::vec2> uvs;
+
+  FILE *file = fopen(path, "r");
+  assert(file && "file not found");
+
+  int tmp = 0;
+  while (1) {
+    char lineHeader[128];
+    int res = fscanf(file, "%s", lineHeader);
+    if (res == EOF)
+      break;
+    if (strcmp(lineHeader, "v") == 0) {
+      glm::vec3 vert;
+      tmp = fscanf(file, "%f %f %f\n", &vert.x, &vert.y, &vert.z);
+      assert(tmp == 3 && "bad vert");
+      verts.push_back(vert);
+    } else if (strcmp(lineHeader, "vt") == 0) {
+      glm::vec2 uv;
+      tmp = fscanf(file, "%f %f\n", &uv.x, &uv.y);
+      assert(tmp == 2 && "bad uv");
+      uvs.push_back(uv);
+    } else if (strcmp(lineHeader, "vn") == 0) {
+      glm::vec3 norm;
+      tmp = fscanf(file, "%f %f %f\n", &norm.x, &norm.y, &norm.z);
+      assert(tmp == 3 && "bad norm");
+      norms.push_back(norm);
+    } else if (strcmp(lineHeader, "f") == 0) {
+      unsigned int vIndex[3], uvIndex[3], nIndex[3];
+      tmp = fscanf(file, "%d/%d/%d %d/%d/%d %d/%d/%d\n", &vIndex[0],
+                   &uvIndex[0], &nIndex[0], &vIndex[1], &uvIndex[1], &nIndex[1],
+                   &vIndex[2], &uvIndex[2], &nIndex[2]);
+      assert(tmp == 9 && "bad face");
+
+      for (size_t i = 0; i < 3; ++i) {
+        size_t vi, ni, ui;
+        vi = (vIndex[i] - 1);
+        ni = (nIndex[i] - 1);
+        ui = (uvIndex[i] - 1);
+        assert(verts.size() > vi);
+        assert(norms.size() > ni);
+        assert(uvs.size() > ui);
+        auto vert = verts[vi];
+        auto norm = norms[ni];
+        auto uv = uvs[ui];
+        out_vertices->push_back(vert.x);
+        out_vertices->push_back(vert.y);
+        out_vertices->push_back(vert.z);
+        out_vertices->push_back(norm.x);
+        out_vertices->push_back(norm.y);
+        out_vertices->push_back(norm.z);
+        out_vertices->push_back(uv.x);
+        out_vertices->push_back(uv.y);
+      }
+    }
+  }
+  return verts.size();
+}

src/shader.cpp

@@ -45,6 +45,11 @@ void Shader::setFloat(const std::string &name, float value) {
   glUniform1f(glGetUniformLocation(ID, name.c_str()), value);
 }
 
+void Shader::setVec3(const std::string &name, glm::vec3 value) {
+  glUniform3fv(glGetUniformLocation(ID, name.c_str()), 1,
+               glm::value_ptr(value));
+}
+
 void Shader::setMat4(const std::string &name, glm::mat4 value) {
   glUniformMatrix4fv(glGetUniformLocation(ID, name.c_str()), 1, GL_FALSE,
                      glm::value_ptr(value));

src/texture.cpp

@@ -25,7 +25,7 @@ Texture::Texture(GLenum type, const char *path) : type(type) {
   stbi_image_free(data);
 };
 
-Texture::~Texture() {}
+Texture::~Texture() {glDeleteTextures(1, &ID);}
 
 void Texture::bind(GLenum texture) {
   glActiveTexture(texture);