Starting the refactor session on day 14. Moved the glad and KHR dirs into src to start.

14-refactor/src/model.cpp

@@ -0,0 +1,171 @@
+#include "model.hpp"
+#include "dbc.hpp"
+
+unsigned int TextureFromFile(const std::string& path, const std::string& directory, bool gamma)
+{
+  std::string filename = path + "/" + filename;
+
+  unsigned int textureID;
+  glGenTextures(1, &textureID);
+
+  int width = 0;
+  int height = 0;
+  int nrComponents = 0;
+
+  unsigned char *data = stbi_load(filename.c_str(), &width, &height, &nrComponents, 0);
+  dbc::check(data != nullptr, $F("Failed to load texture {}", filename));
+
+  GLenum format = GL_RGB;
+
+  if (nrComponents == 1) {
+    format = GL_RED;
+  } else if (nrComponents == 3) {
+    format = GL_RGB;
+  } else if (nrComponents == 4) {
+    format = GL_RGBA;
+  }
+
+  glBindTexture(GL_TEXTURE_2D, textureID);
+  glTexImage2D(GL_TEXTURE_2D, 0, format, width, height, 0, format, GL_UNSIGNED_BYTE, data);
+  glGenerateMipmap(GL_TEXTURE_2D);
+
+  glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_REPEAT);
+  glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_REPEAT);
+  glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR_MIPMAP_LINEAR);
+  glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR);
+
+  stbi_image_free(data);
+
+  return textureID;
+}
+
+void Model::Draw(Shader &shader) {
+  for(unsigned int i = 0; i < meshes.size(); i++) {
+    meshes[i].Draw(shader);
+  }
+}
+
+void Model::loadModel(std::string path) {
+  Assimp::Importer importer;
+  const aiScene* scene = importer.ReadFile(path, aiProcess_Triangulate | aiProcess_GenSmoothNormals | aiProcess_FlipUVs | aiProcess_CalcTangentSpace);
+
+  dbc::check(scene != nullptr, "Assimp ReadFile return null");
+  dbc::check(!(scene->mFlags & AI_SCENE_FLAGS_INCOMPLETE), "Assimp says incomplete.");
+  dbc::check(scene->mRootNode != nullptr, "Assimp loaded scene doesn't have a root node");
+
+  directory = path.substr(0, path.find_last_of('/'));
+
+  processNode(scene->mRootNode, scene);
+}
+
+void Model::processNode(aiNode *node, const aiScene *scene) {
+  for(unsigned int i = 0; i < node->mNumMeshes; i++) {
+    aiMesh* mesh = scene->mMeshes[node->mMeshes[i]];
+    meshes.push_back(processMesh(mesh, scene));
+  }
+
+  for(unsigned int i = 0; i < node->mNumChildren; i++) {
+    processNode(node->mChildren[i], scene);
+  }
+}
+
+Mesh Model::processMesh(aiMesh *mesh, const aiScene *scene) {
+  std::vector<Vertex> vertices;
+  std::vector<unsigned int> indices;
+  std::vector<Texture> textures;
+
+  for(unsigned int i = 0; i < mesh->mNumVertices; i++) {
+    Vertex vertex;
+    vertex.Position = glm::vec3(
+      mesh->mVertices[i].x,
+      mesh->mVertices[i].y,
+      mesh->mVertices[i].z);
+
+    if(mesh->HasNormals()) {
+      vertex.Normal = glm::vec3(
+        mesh->mNormals[i].x,
+        mesh->mNormals[i].y,
+        mesh->mNormals[i].z);
+    }
+
+    if(mesh->mTextureCoords[0]) {
+      vertex.TexCoords = glm::vec2(
+          mesh->mTextureCoords[0][i].x,
+          mesh->mTextureCoords[0][i].y
+      );
+    } else {
+      vertex.TexCoords = glm::vec2(0.0f, 0.0f);
+    }
+
+    vertices.push_back(vertex);
+  }
+
+  for(unsigned int i = 0; i < mesh->mNumFaces; i++) {
+    aiFace face = mesh->mFaces[i];
+
+    for(unsigned int j = 0; j < face.mNumIndices; j++) {
+      indices.push_back(face.mIndices[j]);
+    }
+  }
+
+  aiMaterial* material = scene->mMaterials[mesh->mMaterialIndex];
+
+  // we assume a convention for sampler names in the shaders. Each diffuse texture should be named
+  // as 'texture_diffuseN' where N is a sequential number ranging from 1 to MAX_SAMPLER_NUMBER.
+  // Same applies to other texture as the following list summarizes:
+  // diffuse: texture_diffuseN
+  // specular: texture_specularN
+  // normal: texture_normalN
+
+  // 1. diffuse maps
+  std::vector<Texture> diffuseMaps = loadMaterialTextures(material, aiTextureType_DIFFUSE, "texture_diffuse");
+  textures.insert(textures.end(), diffuseMaps.begin(), diffuseMaps.end());
+
+  // 2. specular maps
+  std::vector<Texture> specularMaps = loadMaterialTextures(material, aiTextureType_SPECULAR, "texture_specular");
+  textures.insert(textures.end(), specularMaps.begin(), specularMaps.end());
+
+  // 3. normal maps
+  std::vector<Texture> normalMaps = loadMaterialTextures(material, aiTextureType_HEIGHT, "texture_normal");
+  textures.insert(textures.end(), normalMaps.begin(), normalMaps.end());
+
+  // 4. height maps
+  std::vector<Texture> heightMaps = loadMaterialTextures(material, aiTextureType_AMBIENT, "texture_height");
+  textures.insert(textures.end(), heightMaps.begin(), heightMaps.end());
+
+  return Mesh(vertices, indices, textures);
+}
+
+std::vector<Texture> Model::loadMaterialTextures(aiMaterial *mat, aiTextureType type, std::string typeName)
+{
+  fmt::println("TEXTURE COUNT: {}, {}, {}", (int)type, typeName, mat->GetTextureCount(type));
+
+  std::vector<Texture> textures;
+  for(unsigned int i = 0; i < mat->GetTextureCount(type); i++) {
+    aiString str;
+    mat->GetTexture(type, i, &str);
+    std::string tx_str{str.C_Str()};
+
+    bool skip = false;
+    for(unsigned int j = 0; j < textures_loaded.size(); j++) {
+      if(textures_loaded[j].path == tx_str) {
+        textures.push_back(textures_loaded[j]);
+        skip = true;
+        break;
+      }
+    }
+
+    if(!skip) {
+      Texture texture{
+        .id = TextureFromFile(tx_str, directory),
+        .type = typeName,
+        .path = tx_str,
+      };
+
+      textures.push_back(texture);
+      textures_loaded.push_back(texture);
+    }
+  }
+
+  return textures;
+}