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#pragma once
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// Std. Includes
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#include <string>
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#include <fstream>
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#include <sstream>
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#include <iostream>
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#include <map>
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#include <vector>
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using namespace std;
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// GL Includes
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#include <GL/glew.h> // Contains all the necessery OpenGL includes
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#include <glm/glm.hpp>
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#include <glm/gtc/matrix_transform.hpp>
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#include <SOIL.h>
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#include <assimp/Importer.hpp>
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#include <assimp/scene.h>
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#include <assimp/postprocess.h>
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#include "Mesh.h"
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GLint TextureFromFile(const char* path, string directory);
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class Model
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{
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public:
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/* Functions */
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// Constructor, expects a filepath to a 3D model.
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Model(GLchar* path)
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{
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this->loadModel(path);
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}
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// Draws the model, and thus all its meshes
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void Draw(Shader shader)
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{
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for (GLuint i = 0; i < this->meshes.size(); i++)
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this->meshes[i].Draw(shader);
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}
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private:
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/* Model Data */
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vector<Mesh> meshes;
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string directory;
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vector<Texture> textures_loaded; // Stores all the textures loaded so far, optimization to make sure textures aren't loaded more than once.
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/* Functions */
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// Loads a model with supported ASSIMP extensions from file and stores the resulting meshes in the meshes vector.
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void loadModel(string path)
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{
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// Read file via ASSIMP
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Assimp::Importer importer;
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const aiScene* scene = importer.ReadFile(path, aiProcess_Triangulate | aiProcess_FlipUVs);
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// Check for errors
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if (!scene || scene->mFlags == AI_SCENE_FLAGS_INCOMPLETE || !scene->mRootNode) // if is Not Zero
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{
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cout << "ERROR::ASSIMP:: " << importer.GetErrorString() << endl;
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return;
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}
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// Retrieve the directory path of the filepath
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this->directory = path.substr(0, path.find_last_of('/'));
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// Process ASSIMP's root node recursively
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this->processNode(scene->mRootNode, scene);
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}
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// Processes a node in a recursive fashion. Processes each individual mesh located at the node and repeats this process on its children nodes (if any).
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void processNode(aiNode* node, const aiScene* scene)
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{
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// Process each mesh located at the current node
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for (GLuint i = 0; i < node->mNumMeshes; i++)
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{
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// The node object only contains indices to index the actual objects in the scene.
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// The scene contains all the data, node is just to keep stuff organized (like relations between nodes).
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aiMesh* mesh = scene->mMeshes[node->mMeshes[i]];
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this->meshes.push_back(this->processMesh(mesh, scene));
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}
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// After we've processed all of the meshes (if any) we then recursively process each of the children nodes
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for (GLuint i = 0; i < node->mNumChildren; i++)
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{
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this->processNode(node->mChildren[i], scene);
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}
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}
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Mesh processMesh(aiMesh* mesh, const aiScene* scene)
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{
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// Data to fill
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vector<Vertex> vertices;
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vector<GLuint> indices;
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vector<Texture> textures;
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// Walk through each of the mesh's vertices
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for (GLuint i = 0; i < mesh->mNumVertices; i++)
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{
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Vertex vertex;
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glm::vec3 vector; // We declare a placeholder vector since assimp uses its own vector class that doesn't directly convert to glm's vec3 class so we transfer the data to this placeholder glm::vec3 first.
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// Positions
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vector.x = mesh->mVertices[i].x;
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vector.y = mesh->mVertices[i].y;
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vector.z = mesh->mVertices[i].z;
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vertex.Position = vector;
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// Normals
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vector.x = mesh->mNormals[i].x;
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vector.y = mesh->mNormals[i].y;
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vector.z = mesh->mNormals[i].z;
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vertex.Normal = vector;
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// Texture Coordinates
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if (mesh->mTextureCoords[0]) // Does the mesh contain texture coordinates?
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{
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glm::vec2 vec;
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// A vertex can contain up to 8 different texture coordinates. We thus make the assumption that we won't
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// use models where a vertex can have multiple texture coordinates so we always take the first set (0).
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vec.x = mesh->mTextureCoords[0][i].x;
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vec.y = mesh->mTextureCoords[0][i].y;
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vertex.TexCoords = vec;
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}
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else
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vertex.TexCoords = glm::vec2(0.0f, 0.0f);
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vertices.push_back(vertex);
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}
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// Now wak through each of the mesh's faces (a face is a mesh its triangle) and retrieve the corresponding vertex indices.
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for (GLuint i = 0; i < mesh->mNumFaces; i++)
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{
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aiFace face = mesh->mFaces[i];
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// Retrieve all indices of the face and store them in the indices vector
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for (GLuint j = 0; j < face.mNumIndices; j++)
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indices.push_back(face.mIndices[j]);
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}
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// Process materials
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if (mesh->mMaterialIndex >= 0)
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{
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aiMaterial* material = scene->mMaterials[mesh->mMaterialIndex];
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// We assume a convention for sampler names in the shaders. Each diffuse texture should be named
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// as 'texture_diffuseN' where N is a sequential number ranging from 1 to MAX_SAMPLER_NUMBER.
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// Same applies to other texture as the following list summarizes:
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// Diffuse: texture_diffuseN
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// Specular: texture_specularN
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// Normal: texture_normalN
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// 1. Diffuse maps
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vector<Texture> diffuseMaps = this->loadMaterialTextures(material, aiTextureType_DIFFUSE, "texture_diffuse");
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textures.insert(textures.end(), diffuseMaps.begin(), diffuseMaps.end());
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// 2. Specular maps
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vector<Texture> specularMaps = this->loadMaterialTextures(material, aiTextureType_SPECULAR, "texture_specular");
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textures.insert(textures.end(), specularMaps.begin(), specularMaps.end());
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}
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// Return a mesh object created from the extracted mesh data
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return Mesh(vertices, indices, textures);
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}
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// Checks all material textures of a given type and loads the textures if they're not loaded yet.
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// The required info is returned as a Texture struct.
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vector<Texture> loadMaterialTextures(aiMaterial* mat, aiTextureType type, string typeName)
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{
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vector<Texture> textures;
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for (GLuint i = 0; i < mat->GetTextureCount(type); i++)
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{
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aiString str;
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mat->GetTexture(type, i, &str);
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// Check if texture was loaded before and if so, continue to next iteration: skip loading a new texture
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GLboolean skip = false;
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for (GLuint j = 0; j < textures_loaded.size(); j++)
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{
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if (textures_loaded[j].path == str)
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{
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textures.push_back(textures_loaded[j]);
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skip = true; // A texture with the same filepath has already been loaded, continue to next one. (optimization)
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break;
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}
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}
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if (!skip)
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{ // If texture hasn't been loaded already, load it
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Texture texture;
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texture.id = TextureFromFile(str.C_Str(), this->directory);
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texture.type = typeName;
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texture.path = str;
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textures.push_back(texture);
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this->textures_loaded.push_back(texture); // Store it as texture loaded for entire model, to ensure we won't unnecesery load duplicate textures.
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}
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}
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return textures;
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}
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};
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GLint TextureFromFile(const char* path, string directory)
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{
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//Generate texture ID and load texture data
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string filename = string(path);
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filename = directory + '/' + filename;
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GLuint textureID;
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glGenTextures(1, &textureID);
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int width, height;
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unsigned char* image = SOIL_load_image(filename.c_str(), &width, &height, 0, SOIL_LOAD_RGB);
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// Assign texture to ID
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glBindTexture(GL_TEXTURE_2D, textureID);
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glTexImage2D(GL_TEXTURE_2D, 0, GL_RGB, width, height, 0, GL_RGB, GL_UNSIGNED_BYTE, image);
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glGenerateMipmap(GL_TEXTURE_2D);
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// Parameters
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glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_REPEAT);
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glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_REPEAT);
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glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR_MIPMAP_LINEAR);
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glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR);
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glBindTexture(GL_TEXTURE_2D, 0);
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SOIL_free_image_data(image);
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return textureID;
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}
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