loading obj files working.

headers/camera.hpp

@@ -11,6 +11,7 @@ public:
   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;

headers/mesh.hpp

@@ -8,6 +8,7 @@
 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);

headers/obj.hpp

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

src/camera.cpp

@@ -52,6 +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

@@ -1,11 +1,10 @@
 #include "camera.hpp"
-#include <glad/glad.h> /*Must be before GLFW*/
+#include "glad/glad.h"
 #include <GLFW/glfw3.h>
 #include <cassert>
 #include <glm/glm.hpp>
 #include <mesh.hpp>
 #include <shader.hpp>
-#include <shapes.h>
 #include <texture.hpp>
 
 #define UNUSED(x) (void)(x)
@@ -37,21 +36,11 @@ GLFWwindow *init() {
   return window;
 }
 
-unsigned int meshInit() {
-  unsigned int VBO, VAO;
-  glGenVertexArrays(1, &VAO);
-  glBindVertexArray(VAO);
-
-  glGenBuffers(1, &VBO);
-  glBindBuffer(GL_ARRAY_BUFFER, VBO);
-  glBufferData(GL_ARRAY_BUFFER, sizeof(uvcube), uvcube, GL_STATIC_DRAW);
-
-  glVertexAttribPointer(0, 3, GL_FLOAT, GL_FALSE, 6 * sizeof(float), (void *)0);
-  glVertexAttribPointer(1, 3, GL_FLOAT, GL_FALSE, 6 * sizeof(float),
-                        (void *)(3 * sizeof(float)));
-  glEnableVertexAttribArray(0);
-  glEnableVertexAttribArray(1);
-  return VAO;
+void showFPS(GLFWwindow *window, double delta) {
+  char title[22];
+  title[21] = '\0';
+  snprintf(title, 20, "OpenGl FPS: [%3.2f]", (1 / delta));
+  glfwSetWindowTitle(window, title);
 }
 
 int main(void) {
@@ -67,9 +56,8 @@ int main(void) {
   Shader *lightShader = new Shader("./shaders/lighting/Vert.glsl",
                                    "./shaders/lighting/LightFrag.glsl");
 
-  uint VAO = meshInit();
-  Mesh *cube = new Mesh(cubeShader, VAO, 36);
-  Mesh *light = new Mesh(lightShader, VAO, 36);
+  Mesh *cube = new Mesh(cubeShader, "./cube.obj");
+  Mesh *light = new Mesh(lightShader, "./cube.obj");
   cube->setOwnedShader(true);
   light->setOwnedShader(true);
 
@@ -79,9 +67,10 @@ int main(void) {
   glEnable(GL_DEPTH_TEST);
   float lastFrame = 0;
   while (!glfwWindowShouldClose(window)) {
-    float currentFrame = static_cast<float>(glfwGetTime());
+    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);
@@ -91,7 +80,7 @@ int main(void) {
     s->setVec3("lightColor", lightColor);
     s->setVec3("ourColor", glm::vec3(0.24725, 0.1995, 0.0745));
     s->setVec3("lightPos", lightPos);
-    s->setVec3("viewPos", glm::vec3(0.0, 0.0, 5.0));
+    s->setVec3("viewPos", cam->getPos());
 
     s->setVec3("light.ambient", glm::vec3(0.2));
     s->setVec3("light.diffuse", glm::vec3(0.5));

src/mesh.cpp

@@ -1,12 +1,24 @@
 #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;
@@ -18,7 +30,7 @@ Mesh::~Mesh() {
 
 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());
@@ -26,7 +38,7 @@ void Mesh::draw(Camera *c) {
   model = glm::scale(model, scale);
   model = model * glm::mat4_cast(rotation);
   shader->setMat4("model", model);
-  glDrawArrays(GL_TRIANGLES, 0, 36);
+  glDrawArrays(GL_TRIANGLES, 0, count);
 }
 
 void Mesh::setPosition(glm::vec3 p) { position = p; }
@@ -40,3 +52,27 @@ 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();
+}