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restructure v2

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This commit is contained in:
Claire Schwarzer 2026-07-08 14:24:34 +02:00
parent e01595e155
commit dc5654ba9a
20 changed files with 910 additions and 791 deletions
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14
CMakeLists.txt
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@ -11,10 +11,11 @@ set(CMAKE_CXX_EXTENSIONS OFF)
set(SOURCES
main.cpp
game/game.cpp
engine/assets/modelLoader.cpp
engine/Assets/modelLoader.cpp
vendor/glad/glad.c
vendor/stb/stb_image.cpp
engine/Backend/Backend.cpp
engine/Backend/Model.cpp
)
set(HEADERS
@ -24,7 +25,16 @@ set(HEADERS
engine/mesh.h
engine/camera.h
game/game.h
engine/assets/modelLoader.h
engine/Assets/modelLoader.h
engine/Backend/Model.h
engine/Backend/Mesh.cpp
engine/Backend/Mesh.h
engine/Backend/Shader.cpp
engine/Backend/Shader.h
engine/Backend/Texture.cpp
engine/Backend/Texture.h
engine/Backend/Camera.cpp
engine/Backend/Camera.h
)
# Create the executable

0
engine/assets/export_embedded_fbx.py → engine/Assets/export_embedded_fbx.py
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4
engine/assets/modelLoader.cpp → engine/Assets/modelLoader.cpp
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@ -1,7 +1,9 @@
#include "modelLoader.h"
namespace engine::assets
#include <iostream>
namespace engine::Assets
{
Model loadBlendModel(const char *path)
{

4
engine/assets/modelLoader.h → engine/Assets/modelLoader.h
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@ -1,8 +1,8 @@
#pragma once
#include "engine/model.h"
#include "engine/Backend/Model.h"
namespace engine::assets
namespace engine::Assets
{
Model loadBlendModel(const char *path);
Model loadModel(const char *path);

107
engine/Backend/Camera.cpp Normal file
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@ -0,0 +1,107 @@
#include "Camera.h"
#include <glm/gtc/matrix_transform.hpp>
// constructor with vectors
Camera::Camera(glm::vec3 newPosition, glm::vec3 up, float newYaw, float newPitch) : front(glm::vec3(0.0f, 0.0f, -1.0f)), movementSpeed(SPEED), mouseSensitivity(SENSITIVITY), zoom(ZOOM)
{
position = newPosition;
worldUp = up;
yaw = newYaw;
pitch = newPitch;
updateCameraVectors();
}
// constructor with scalar values
Camera::Camera(float posX, float posY, float posZ, float upX, float upY, float upZ, float newYaw, float newPitch) : front(glm::vec3(0.0f, 0.0f, -1.0f)), movementSpeed(SPEED), mouseSensitivity(SENSITIVITY), zoom(ZOOM)
{
position = glm::vec3(posX, posY, posZ);
worldUp = glm::vec3(upX, upY, upZ);
yaw = newYaw;
pitch = newPitch;
updateCameraVectors();
}
// returns the view matrix calculated using Euler Angles and the LookAt Matrix
glm::mat4 Camera::GetViewMatrix()
{
return glm::lookAt(position, position + front, up);
}
// processes input received from any keyboard-like input system. Accepts input parameter in the form of camera defined ENUM (to abstract it from windowing systems)
void Camera::processKeyboard(Camera_Movement direction, float deltaTime)
{
float velocity = movementSpeed * deltaTime;
if (sprinting)
velocity *= 8;
if (direction == FORWARD)
position += front * velocity;
if (direction == BACKWARD)
position -= front * velocity;
if (direction == LEFT)
position -= right * velocity;
if (direction == RIGHT)
position += right * velocity;
if (direction == SPRINT)
sprinting = !sprinting;
}
// processes input received from a mouse input system. Expects the offset value in both the x and y direction.
void Camera::processMouseMovement(float xoffset, float yoffset, GLboolean constrainPitch)
{
xoffset *= mouseSensitivity;
yoffset *= mouseSensitivity;
yaw += xoffset;
pitch += yoffset;
// make sure that when pitch is out of bounds, screen doesn't get flipped
if (constrainPitch)
{
if (pitch > 89.0f)
pitch = 89.0f;
if (pitch < -89.0f)
pitch = -89.0f;
}
// update Front, Right and Up Vectors using the updated Euler angles
updateCameraVectors();
}
// processes input received from a mouse scroll-wheel event. Only requires input on the vertical wheel-axis
void Camera::processMouseScroll(float yoffset)
{
zoom -= (float)yoffset;
if (zoom < 1.0f)
zoom = 1.0f;
if (zoom > 45.0f)
zoom = 45.0f;
}
void Camera::Update(Shader shader, int screenWidth, int screenHeight)
{
glm::mat4 projection = glm::perspective(glm::radians(zoom), (float)screenWidth / (float)screenHeight, 0.1f, 100.0f);
shader.setMat4("projection", projection);
shader.setMat4("view", GetViewMatrix());
shader.setVec3("viewPos", position);
}
// calculates the front vector from the Camera's (updated) Euler Angles
void Camera::updateCameraVectors()
{
// calculate the new Front vector
glm::vec3 newFront;
newFront.x = cos(glm::radians(yaw)) * cos(glm::radians(pitch));
newFront.y = sin(glm::radians(pitch));
newFront.z = sin(glm::radians(yaw)) * cos(glm::radians(pitch));
front = glm::normalize(newFront);
// also re-calculate the Right and Up vector
right = glm::normalize(glm::cross(front, worldUp)); // normalize the vectors, because their length gets closer to 0 the more you look up or down which results in slower movement.
up = glm::normalize(glm::cross(right, front));
}

51
engine/Backend/Camera.h Normal file
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@ -0,0 +1,51 @@
#pragma once
#include "Shader.h"
#include <glad/glad.h>
#include <glm/glm.hpp>
// Movement keys/buttons
enum Camera_Movement {
FORWARD,
BACKWARD,
LEFT,
RIGHT,
SPRINT
};
// Default camera values
const float YAW = -90.0f;
const float PITCH = 0.0f;
const float SPEED = 5.5f;
const float SENSITIVITY = 0.1f;
const float ZOOM = 45.0f;
class Camera
{
public:
glm::vec3 position, front, up, right, worldUp;
float yaw, pitch;
float movementSpeed, mouseSensitivity, zoom;
bool sprinting = false;
// constructor with vectors
Camera(glm::vec3 newPosition = glm::vec3(0.0f, 0.0f, 0.0f), glm::vec3 up = glm::vec3(0.0f, 1.0f, 0.0f), float newYaw = YAW, float newPitch = PITCH); // constructor with scalar values
Camera(float posX, float posY, float posZ, float upX, float upY, float upZ, float newYaw, float newPitch);
// returns the view matrix calculated using Euler Angles and the LookAt Matrix
glm::mat4 GetViewMatrix();
// processes input received from any keyboard-like input system. Accepts input parameter in the form of camera defined ENUM (to abstract it from windowing systems)
void processKeyboard(Camera_Movement direction, float deltaTime);
// processes input received from a mouse input system. Expects the offset value in both the x and y direction.
void processMouseMovement(float xoffset, float yoffset, GLboolean constrainPitch = true);
// processes input received from a mouse scroll-wheel event. Only requires input on the vertical wheel-axis
void processMouseScroll(float yoffset);
void Update(Shader shader, int screenWidth, int screenHeight);
private:
// calculates the front vector from the Camera's (updated) Euler Angles
void updateCameraVectors();
};

101
engine/Backend/Mesh.cpp Normal file
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@ -0,0 +1,101 @@
#include "Mesh.h"
#include <glad/glad.h> // holds all OpenGL type declarations
#include <glm/gtc/matrix_transform.hpp>
#include <string>
#include <vector>
// constructor
Mesh::Mesh(vector<Vertex> vertices, vector<unsigned int> indices, vector<Texture> textures)
{
this->vertices = vertices;
this->indices = indices;
this->textures = textures;
// now that we have all the required data, set the vertex buffers and its attribute pointers.
setupMesh();
}
// render the mesh
void Mesh::Draw(Shader &shader)
{
// bind appropriate textures
unsigned int diffuseNr = 1;
unsigned int specularNr = 1;
unsigned int normalNr = 1;
unsigned int heightNr = 1;
for(unsigned int i = 0; i < textures.size(); i++)
{
glActiveTexture(GL_TEXTURE0 + i); // active proper texture unit before binding
// retrieve texture number (the N in diffuse_textureN)
string number;
string name = textures[i].type;
if(name == "texture_diffuse")
number = std::to_string(diffuseNr++);
else if(name == "texture_specular")
number = std::to_string(specularNr++); // transfer unsigned int to string
else if(name == "texture_normal")
number = std::to_string(normalNr++); // transfer unsigned int to string
else if(name == "texture_height")
number = std::to_string(heightNr++); // transfer unsigned int to string
// now set the sampler to the correct texture unit
glUniform1i(glGetUniformLocation(shader.ID, (name + number).c_str()), i);
// and finally bind the texture
glBindTexture(GL_TEXTURE_2D, textures[i].id);
}
// draw mesh
glBindVertexArray(VAO);
glDrawElements(GL_TRIANGLES, static_cast<unsigned int>(indices.size()), GL_UNSIGNED_INT, 0);
glBindVertexArray(0);
// always good practice to set everything back to defaults once configured.
glActiveTexture(GL_TEXTURE0);
}
// initializes all the buffer objects/arrays
void Mesh::setupMesh()
{
// create buffers/arrays
glGenVertexArrays(1, &VAO);
glGenBuffers(1, &VBO);
glGenBuffers(1, &EBO);
glBindVertexArray(VAO);
// load data into vertex buffers
glBindBuffer(GL_ARRAY_BUFFER, VBO);
// A great thing about structs is that their memory layout is sequential for all its items.
// The effect is that we can simply pass a pointer to the struct and it translates perfectly to a glm::vec3/2 array which
// again translates to 3/2 floats which translates to a byte array.
glBufferData(GL_ARRAY_BUFFER, vertices.size() * sizeof(Vertex), &vertices[0], GL_STATIC_DRAW);
glBindBuffer(GL_ELEMENT_ARRAY_BUFFER, EBO);
glBufferData(GL_ELEMENT_ARRAY_BUFFER, indices.size() * sizeof(unsigned int), &indices[0], GL_STATIC_DRAW);
// set the vertex attribute pointers
// vertex Positions
glEnableVertexAttribArray(0);
glVertexAttribPointer(0, 3, GL_FLOAT, GL_FALSE, sizeof(Vertex), (void*)0);
// vertex normals
glEnableVertexAttribArray(1);
glVertexAttribPointer(1, 3, GL_FLOAT, GL_FALSE, sizeof(Vertex), (void*)offsetof(Vertex, Normal));
// vertex texture coords
glEnableVertexAttribArray(2);
glVertexAttribPointer(2, 2, GL_FLOAT, GL_FALSE, sizeof(Vertex), (void*)offsetof(Vertex, TexCoords));
// vertex tangent
glEnableVertexAttribArray(3);
glVertexAttribPointer(3, 3, GL_FLOAT, GL_FALSE, sizeof(Vertex), (void*)offsetof(Vertex, Tangent));
// vertex bitangent
glEnableVertexAttribArray(4);
glVertexAttribPointer(4, 3, GL_FLOAT, GL_FALSE, sizeof(Vertex), (void*)offsetof(Vertex, Bitangent));
// ids
glEnableVertexAttribArray(5);
glVertexAttribIPointer(5, 4, GL_INT, sizeof(Vertex), (void*)offsetof(Vertex, m_BoneIDs));
// weights
glEnableVertexAttribArray(6);
glVertexAttribPointer(6, 4, GL_FLOAT, GL_FALSE, sizeof(Vertex), (void*)offsetof(Vertex, m_Weights));
glBindVertexArray(0);
}

50
engine/Backend/Mesh.h Normal file
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@ -0,0 +1,50 @@
#pragma once
#include <glm/glm.hpp>
#include <engine/Backend/Shader.h>
using namespace std;
#define MAX_BONE_INFLUENCE 4
struct Vertex {
// position
glm::vec3 Position;
// normal
glm::vec3 Normal;
// texCoords
glm::vec2 TexCoords;
// tangent
glm::vec3 Tangent;
// bitangent
glm::vec3 Bitangent;
//bone indexes which will influence this vertex
int m_BoneIDs[MAX_BONE_INFLUENCE];
//weights from each bone
float m_Weights[MAX_BONE_INFLUENCE];
};
struct Texture {
unsigned int id;
string type;
string path;
};
class Mesh {
public:
// mesh Data
vector<Vertex> vertices;
vector<unsigned int> indices;
vector<Texture> textures;
unsigned int VAO;
Mesh(vector<Vertex> vertices, vector<unsigned int> indices, vector<Texture> textures);
void Draw(Shader &shader);
private:
// render data
unsigned int VBO, EBO;
// initializes all the buffer objects/arrays
void setupMesh();
};

240
engine/Backend/Model.cpp Normal file
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@ -0,0 +1,240 @@
#include "Model.h"
#include <glad/glad.h>
#include <glm/glm.hpp>
#include <glm/gtc/matrix_transform.hpp>
#include <stb/stb_image.h>
#include <assimp/postprocess.h>
#include <string>
#include <fstream>
#include <iostream>
#include <map>
#include <vector>
#include <filesystem>
using namespace std;
// constructor, expects a filepath to a 3D model.
Model::Model(string const &path, bool gamma) : gammaCorrection(gamma)
{
loadModel(path);
}
// draws the model, and thus all its meshes
void Model::Draw(Shader &shader)
{
for(unsigned int i = 0; i < meshes.size(); i++)
meshes[i].Draw(shader);
}
// loads a model with supported ASSIMP extensions from file and stores the resulting meshes in the meshes vector.
void Model::loadModel(string const &path)
{
// read file via ASSIMP
Assimp::Importer importer;
const aiScene* scene = importer.ReadFile(path, aiProcess_Triangulate | aiProcess_GenSmoothNormals | aiProcess_FlipUVs | aiProcess_CalcTangentSpace);
// check for errors
if(!scene || scene->mFlags & AI_SCENE_FLAGS_INCOMPLETE || !scene->mRootNode) // if is Not Zero
{
cout << "ERROR::ASSIMP:: " << importer.GetErrorString() << endl;
return;
}
// retrieve the directory path of the filepath
directory = path.substr(0, path.find_last_of('/'));
// process ASSIMP's root node recursively
processNode(scene->mRootNode, scene);
}
// 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).
void Model::processNode(aiNode *node, const aiScene *scene)
{
// process each mesh located at the current node
for(unsigned int i = 0; i < node->mNumMeshes; i++)
{
// the node object only contains indices to index the actual objects in the scene.
// the scene contains all the data, node is just to keep stuff organized (like relations between nodes).
aiMesh* mesh = scene->mMeshes[node->mMeshes[i]];
meshes.push_back(processMesh(mesh, scene));
}
// after we've processed all of the meshes (if any) we then recursively process each of the children nodes
for(unsigned int i = 0; i < node->mNumChildren; i++)
{
processNode(node->mChildren[i], scene);
}
}
Mesh Model::processMesh(aiMesh *mesh, const aiScene *scene)
{
// data to fill
vector<Vertex> vertices;
vector<unsigned int> indices;
vector<Texture> textures;
// walk through each of the mesh's vertices
for(unsigned int i = 0; i < mesh->mNumVertices; i++)
{
Vertex vertex;
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.
// positions
vector.x = mesh->mVertices[i].x;
vector.y = mesh->mVertices[i].y;
vector.z = mesh->mVertices[i].z;
vertex.Position = vector;
// normals
if (mesh->HasNormals())
{
vector.x = mesh->mNormals[i].x;
vector.y = mesh->mNormals[i].y;
vector.z = mesh->mNormals[i].z;
vertex.Normal = vector;
}
// texture coordinates
if(mesh->mTextureCoords[0]) // does the mesh contain texture coordinates?
{
glm::vec2 vec;
// a vertex can contain up to 8 different texture coordinates. We thus make the assumption that we won't
// use models where a vertex can have multiple texture coordinates so we always take the first set (0).
vec.x = mesh->mTextureCoords[0][i].x;
vec.y = mesh->mTextureCoords[0][i].y;
vertex.TexCoords = vec;
// tangent
vector.x = mesh->mTangents[i].x;
vector.y = mesh->mTangents[i].y;
vector.z = mesh->mTangents[i].z;
vertex.Tangent = vector;
// bitangent
vector.x = mesh->mBitangents[i].x;
vector.y = mesh->mBitangents[i].y;
vector.z = mesh->mBitangents[i].z;
vertex.Bitangent = vector;
}
else
vertex.TexCoords = glm::vec2(0.0f, 0.0f);
vertices.push_back(vertex);
}
// now wak through each of the mesh's faces (a face is a mesh its triangle) and retrieve the corresponding vertex indices.
for(unsigned int i = 0; i < mesh->mNumFaces; i++)
{
aiFace face = mesh->mFaces[i];
// retrieve all indices of the face and store them in the indices vector
for(unsigned int j = 0; j < face.mNumIndices; j++)
indices.push_back(face.mIndices[j]);
}
// process materials
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
vector<Texture> diffuseMaps = loadMaterialTextures(material, aiTextureType_DIFFUSE, "texture_diffuse", true);
textures.insert(textures.end(), diffuseMaps.begin(), diffuseMaps.end());
// 2. specular maps
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 a mesh object created from the extracted mesh data
return Mesh(vertices, indices, textures);
}
// checks all material textures of a given type and loads the textures if they're not loaded yet.
// the required info is returned as a Texture struct.
vector<Texture> Model::loadMaterialTextures(aiMaterial *mat, aiTextureType type, string typeName, bool fallback)
{
vector<Texture> textures;
for(unsigned int i = 0; i < mat->GetTextureCount(type); i++)
{
aiString str;
mat->GetTexture(type, i, &str);
// check if texture was loaded before and if so, continue to next iteration: skip loading a new texture
bool skip = false;
for(unsigned int j = 0; j < textures_loaded.size(); j++)
{
if(std::strcmp(textures_loaded[j].path.data(), str.C_Str()) == 0)
{
textures.push_back(textures_loaded[j]);
skip = true; // a texture with the same filepath has already been loaded, continue to next one. (optimization)
break;
}
}
if(!skip)
{ // if texture hasn't been loaded already, load it
Texture texture;
texture.id = TextureFromFile(str.C_Str(), this->directory);
texture.type = typeName;
texture.path = str.C_Str();
textures.push_back(texture);
textures_loaded.push_back(texture); // store it as texture loaded for entire model, to ensure we won't unnecessary load duplicate textures.
}
}
// Load DefaultTexture if there isn't one already
if (mat->GetTextureCount(type) == 0) {
string defaultPath = "DefaultTexture.jpg";
Texture texture;
texture.id = TextureFromFile(defaultPath.c_str(), "assets/");
texture.type = typeName;
texture.path = defaultPath;
textures.push_back(texture);
textures_loaded.push_back(texture);
}
return textures;
}
unsigned inline int TextureFromFile(const char *path, const string &directory, bool gamma)
{
string filename = string(path);
filename = directory + '/' + filename;
unsigned int textureID;
glGenTextures(1, &textureID);
int width, height, nrComponents;
unsigned char *data = stbi_load(filename.c_str(), &width, &height, &nrComponents, 0);
if (data)
{
GLenum format;
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);
}
else
{
std::cout << "Texture failed to load at path: " << path << std::endl;
stbi_image_free(data);
}
return textureID;
}

39
engine/Backend/Model.h Normal file
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#pragma once
#include <assimp/Importer.hpp>
#include <assimp/scene.h>
#include <engine/Backend/Shader.h>
#include <engine/Backend/Mesh.h>
class Model
{
public:
// model data
vector<Texture> textures_loaded; // stores all the textures loaded so far, optimization to make sure textures aren't loaded more than once.
vector<Mesh> meshes;
string directory;
bool gammaCorrection;
// constructor, expects a filepath to a 3D model.
Model(string const &path, bool gamma = false);
// draws the model, and thus all its meshes
void Draw(Shader &shader);
private:
// loads a model with supported ASSIMP extensions from file and stores the resulting meshes in the meshes vector.
void loadModel(string const &path);
// 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).
void processNode(aiNode *node, const aiScene *scene);
Mesh processMesh(aiMesh *mesh, const aiScene *scene);
// checks all material textures of a given type and loads the textures if they're not loaded yet.
// the required info is returned as a Texture struct.
vector<Texture> loadMaterialTextures(aiMaterial *mat, aiTextureType type, string typeName, bool fallback = false);
};
unsigned inline int TextureFromFile(const char *path, const string &directory, bool gamma = false);

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engine/Backend/Shader.cpp Normal file
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#include "Shader.h"
#include <fstream>
#include <sstream>
#include <iostream>
Shader::Shader(const char* vertexPath, const char* fragmentPath)
{
std::string vertexCode, fragmentCode;
std::ifstream vertexFile, fragmentFile;
vertexFile.exceptions (std::ifstream::failbit | std::ifstream::badbit);
fragmentFile.exceptions (std::ifstream::failbit | std::ifstream::badbit);
try
{
// Open the files
vertexFile.open(vertexPath);
fragmentFile.open(fragmentPath);
std::stringstream vertexStream, fragmentStream;
// Save the contents to our streams
vertexStream << vertexFile.rdbuf();
fragmentStream << fragmentFile.rdbuf();
// Close files
vertexFile.close();
fragmentFile.close();
// Save the contents to our strings
vertexCode = vertexStream.str();
fragmentCode = fragmentStream.str();
// Fix encoding issues, specifically for Linux
//vertexCode.erase(std::remove(vertexCode.begin(), vertexCode.end(), '\r'), vertexCode.end());
//fragmentCode.erase(std::remove(fragmentCode.begin(), fragmentCode.end(), '\r'), fragmentCode.end());
}
catch (std::ifstream::failure& e)
{
std::cout << "ERROR::SHADER::FILE_NOT_SUCCESSFULLY_READ: " << e.what() << std::endl;
}
const char* vertexShaderSource = vertexCode.c_str();
const char* fragmentShaderSource = fragmentCode.c_str();
unsigned int vertexShader;
vertexShader = glCreateShader(GL_VERTEX_SHADER);
glShaderSource(vertexShader, 1, &vertexShaderSource, NULL);
glCompileShader(vertexShader);
checkCompileErrors(vertexShader, "VERTEX");
unsigned int fragmentShader;
fragmentShader = glCreateShader(GL_FRAGMENT_SHADER);
glShaderSource(fragmentShader, 1, &fragmentShaderSource, NULL);
glCompileShader(fragmentShader);
checkCompileErrors(fragmentShader, "FRAGMENT");
ID = glCreateProgram();
glAttachShader(ID, vertexShader);
glAttachShader(ID, fragmentShader);
glLinkProgram(ID);
checkCompileErrors(ID, "PROGRAM");
glDeleteShader(vertexShader);
glDeleteShader(fragmentShader);
}
void Shader::Use() const
{
glUseProgram(ID);
};
// Setters
void Shader::setBool(const std::string &name, bool value) const
{
glUniform1i(glGetUniformLocation(ID, name.c_str()), (int)value);
}
// ------------------------------------------------------------------------
void Shader::setInt(const std::string &name, int value) const
{
glUniform1i(glGetUniformLocation(ID, name.c_str()), value);
}
// ------------------------------------------------------------------------
void Shader::setFloat(const std::string &name, float value) const
{
glUniform1f(glGetUniformLocation(ID, name.c_str()), value);
}
// ------------------------------------------------------------------------
void Shader::setVec2(const std::string &name, const glm::vec2 &value) const
{
glUniform2fv(glGetUniformLocation(ID, name.c_str()), 1, &value[0]);
}
void Shader::setVec2(const std::string &name, float x, float y) const
{
glUniform2f(glGetUniformLocation(ID, name.c_str()), x, y);
}
// ------------------------------------------------------------------------
void Shader::setVec3(const std::string &name, const glm::vec3 &value) const
{
glUniform3fv(glGetUniformLocation(ID, name.c_str()), 1, &value[0]);
}
void Shader::setVec3(const std::string &name, float x, float y, float z) const
{
glUniform3f(glGetUniformLocation(ID, name.c_str()), x, y, z);
}
// ------------------------------------------------------------------------
void Shader::setArr(const std::string &name, const GLint value[], const int &count) const
{
glUniform1iv(glGetUniformLocation(ID, name.c_str()), count, value);
}
// ------------------------------------------------------------------------
void Shader::setVec4(const std::string &name, const glm::vec4 &value) const
{
glUniform4fv(glGetUniformLocation(ID, name.c_str()), 1, &value[0]);
}
void Shader::setVec4(const std::string &name, float x, float y, float z, float w) const
{
glUniform4f(glGetUniformLocation(ID, name.c_str()), x, y, z, w);
}
// ------------------------------------------------------------------------
void Shader::setMat2(const std::string &name, const glm::mat2 &mat) const
{
glUniformMatrix2fv(glGetUniformLocation(ID, name.c_str()), 1, GL_FALSE, &mat[0][0]);
}
// ------------------------------------------------------------------------
void Shader::setMat3(const std::string &name, const glm::mat3 &mat) const
{
glUniformMatrix3fv(glGetUniformLocation(ID, name.c_str()), 1, GL_FALSE, &mat[0][0]);
}
// ------------------------------------------------------------------------
void Shader::setMat4(const std::string &name, const glm::mat4 &mat) const
{
glUniformMatrix4fv(glGetUniformLocation(ID, name.c_str()), 1, GL_FALSE, &mat[0][0]);
}
void Shader::setDecal(int index, GLint tex, float opacity, const glm::vec4& uvCoords) const {
std::string indexStr = std::to_string(index);
GLint texLoc = glGetUniformLocation(ID, ("decals[" + indexStr + "].tex").c_str());
if (texLoc != -1) glUniform1i(texLoc, tex);
GLint opLoc = glGetUniformLocation(ID, ("decals[" + indexStr + "].opacity").c_str());
if (opLoc != -1) glUniform1f(opLoc, opacity);
GLint uvLoc = glGetUniformLocation(ID, ("decals[" + indexStr + "].uvCoords").c_str());
if (uvLoc != -1) {
glUniform4fv(uvLoc, 1, &uvCoords[0]);
}
}
void Shader::checkCompileErrors(unsigned int shader, std::string type)
{
int success;
char infoLog[1024];
if (type != "PROGRAM")
{
glGetShaderiv(shader, GL_COMPILE_STATUS, &success);
if (!success)
{
glGetShaderInfoLog(shader, 1024, NULL, infoLog);
std::cout << "ERROR::SHADER_COMPILATION_ERROR of type: " << type << "\n" << infoLog << "\n -- --------------------------------------------------- -- " << std::endl;
}
}
else
{
glGetProgramiv(shader, GL_LINK_STATUS, &success);
if (!success)
{
glGetProgramInfoLog(shader, 1024, NULL, infoLog);
std::cout << "ERROR::PROGRAM_LINKING_ERROR of type: " << type << "\n" << infoLog << "\n -- --------------------------------------------------- -- " << std::endl;
}
}
}

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#pragma once
#include <glad/glad.h>
#include <glm/glm.hpp>
#include <string>
class Shader
{
public:
unsigned int ID;
Shader(const char* vertexPath, const char* fragmentPath);
void Use() const;
// Setters;
void setBool(const std::string &name, bool value) const;
void setInt(const std::string &name, int value) const;
void setFloat(const std::string &name, float value) const;
void setVec2(const std::string &name, const glm::vec2 &value) const;
void setVec2(const std::string &name, float x, float y) const;
void setVec3(const std::string &name, const glm::vec3 &value) const;
void setVec3(const std::string &name, float x, float y, float z) const;
void setArr(const std::string &name, const GLint value[], const int &count) const;
void setVec4(const std::string &name, const glm::vec4 &value) const;
void setVec4(const std::string &name, float x, float y, float z, float w) const;
void setMat2(const std::string &name, const glm::mat2 &mat) const;
void setMat3(const std::string &name, const glm::mat3 &mat) const;
void setMat4(const std::string &name, const glm::mat4 &mat) const;
void setDecal(int index, GLint tex, float opacity, const glm::vec4& uvCoords) const;
private:
void checkCompileErrors(unsigned int shader, std::string type);
};

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#include "Texture.h"
#include <iostream>
#include <glad/glad.h>
#define STB_IMAGE_IMPLEMENTATION
#include <stb/stb_image.h>
Texture::Texture(const char* texturePath, bool flip)
{
// Create the Texture and set our ID
glGenTextures(1, &ID);
glBindTexture(GL_TEXTURE_2D, ID);
// set the texture wrapping/filtering options (on the currently bound texture object)
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_NEAREST);
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_NEAREST);
// Grab the texture from our path
if (flip)
stbi_set_flip_vertically_on_load(true);
unsigned char *data = stbi_load(texturePath, &width, &height, &nrChannels, 0);
if (data)
{
GLenum format = (nrChannels == 4) ? GL_RGBA : GL_RGB;
glTexImage2D(GL_TEXTURE_2D, 0, format, width, height, 0, format, GL_UNSIGNED_BYTE, data);
glGenerateMipmap(GL_TEXTURE_2D);
}
else
{
std::cout << "Failed to load texture" << std::endl;
}
if (flip)
stbi_set_flip_vertically_on_load(false);
stbi_image_free(data);
}
void Texture::Draw() const
{
glActiveTexture(GL_TEXTURE0);
glBindTexture(GL_TEXTURE_2D, ID);
}

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#pragma once
class Texture
{
public:
unsigned int ID;
int width, height, nrChannels;
Texture(const char* texturePath, bool flip = false);
void Draw() const;
};

136
engine/camera.h
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#ifndef ENGINE2026_CAMERA_H
#define ENGINE2026_CAMERA_H
#include <glad/glad.h>
#include <glm/glm.hpp>
#include <glm/gtc/matrix_transform.hpp>
// Movement keys/buttons
enum Camera_Movement {
FORWARD,
BACKWARD,
LEFT,
RIGHT,
SPRINT
};
// Default camera values
const float YAW = -90.0f;
const float PITCH = 0.0f;
const float SPEED = 5.5f;
const float SENSITIVITY = 0.1f;
const float ZOOM = 45.0f;
class Camera
{
public:
glm::vec3 position, front, up, right, worldUp;
float yaw, pitch;
float movementSpeed, mouseSensitivity, zoom;
bool sprinting = false;
// constructor with vectors
Camera(glm::vec3 newPosition = glm::vec3(0.0f, 0.0f, 0.0f), glm::vec3 up = glm::vec3(0.0f, 1.0f, 0.0f), float newYaw = YAW, float newPitch = PITCH) : front(glm::vec3(0.0f, 0.0f, -1.0f)), movementSpeed(SPEED), mouseSensitivity(SENSITIVITY), zoom(ZOOM)
{
position = newPosition;
worldUp = up;
yaw = newYaw;
pitch = newPitch;
updateCameraVectors();
}
// constructor with scalar values
Camera(float posX, float posY, float posZ, float upX, float upY, float upZ, float newYaw, float newPitch) : front(glm::vec3(0.0f, 0.0f, -1.0f)), movementSpeed(SPEED), mouseSensitivity(SENSITIVITY), zoom(ZOOM)
{
position = glm::vec3(posX, posY, posZ);
worldUp = glm::vec3(upX, upY, upZ);
yaw = newYaw;
pitch = newPitch;
updateCameraVectors();
}
// returns the view matrix calculated using Euler Angles and the LookAt Matrix
glm::mat4 GetViewMatrix()
{
return glm::lookAt(position, position + front, up);
}
// processes input received from any keyboard-like input system. Accepts input parameter in the form of camera defined ENUM (to abstract it from windowing systems)
void processKeyboard(Camera_Movement direction, float deltaTime)
{
float velocity = movementSpeed * deltaTime;
if (sprinting)
velocity *= 8;
if (direction == FORWARD)
position += front * velocity;
if (direction == BACKWARD)
position -= front * velocity;
if (direction == LEFT)
position -= right * velocity;
if (direction == RIGHT)
position += right * velocity;
if (direction == SPRINT)
sprinting = !sprinting;
}
// processes input received from a mouse input system. Expects the offset value in both the x and y direction.
void processMouseMovement(float xoffset, float yoffset, GLboolean constrainPitch = true)
{
xoffset *= mouseSensitivity;
yoffset *= mouseSensitivity;
yaw += xoffset;
pitch += yoffset;
// make sure that when pitch is out of bounds, screen doesn't get flipped
if (constrainPitch)
{
if (pitch > 89.0f)
pitch = 89.0f;
if (pitch < -89.0f)
pitch = -89.0f;
}
// update Front, Right and Up Vectors using the updated Euler angles
updateCameraVectors();
}
// processes input received from a mouse scroll-wheel event. Only requires input on the vertical wheel-axis
void processMouseScroll(float yoffset)
{
zoom -= (float)yoffset;
if (zoom < 1.0f)
zoom = 1.0f;
if (zoom > 45.0f)
zoom = 45.0f;
}
void Update(Shader shader, int screenWidth, int screenHeight)
{
glm::mat4 projection = glm::perspective(glm::radians(zoom), (float)screenWidth / (float)screenHeight, 0.1f, 100.0f);
shader.setMat4("projection", projection);
shader.setMat4("view", GetViewMatrix());
shader.setVec3("viewPos", position);
}
private:
// calculates the front vector from the Camera's (updated) Euler Angles
void updateCameraVectors()
{
// calculate the new Front vector
glm::vec3 newFront;
newFront.x = cos(glm::radians(yaw)) * cos(glm::radians(pitch));
newFront.y = sin(glm::radians(pitch));
newFront.z = sin(glm::radians(yaw)) * cos(glm::radians(pitch));
front = glm::normalize(newFront);
// also re-calculate the Right and Up vector
right = glm::normalize(glm::cross(front, worldUp)); // normalize the vectors, because their length gets closer to 0 the more you look up or down which results in slower movement.
up = glm::normalize(glm::cross(right, front));
}
};
#endif

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#ifndef ENGINE2026_MESH_H
#define ENGINE2026_MESH_H
#include <glad/glad.h> // holds all OpenGL type declarations
#include <glm/glm.hpp>
#include <glm/gtc/matrix_transform.hpp>
#include <engine/shader.h>
#include <string>
#include <vector>
using namespace std;
#define MAX_BONE_INFLUENCE 4
struct Vertex {
// position
glm::vec3 Position;
// normal
glm::vec3 Normal;
// texCoords
glm::vec2 TexCoords;
// tangent
glm::vec3 Tangent;
// bitangent
glm::vec3 Bitangent;
//bone indexes which will influence this vertex
int m_BoneIDs[MAX_BONE_INFLUENCE];
//weights from each bone
float m_Weights[MAX_BONE_INFLUENCE];
};
struct Texture {
unsigned int id;
string type;
string path;
};
class Mesh {
public:
// mesh Data
vector<Vertex> vertices;
vector<unsigned int> indices;
vector<Texture> textures;
unsigned int VAO;
// constructor
Mesh(vector<Vertex> vertices, vector<unsigned int> indices, vector<Texture> textures)
{
this->vertices = vertices;
this->indices = indices;
this->textures = textures;
// now that we have all the required data, set the vertex buffers and its attribute pointers.
setupMesh();
}
// render the mesh
void Draw(Shader &shader)
{
// bind appropriate textures
unsigned int diffuseNr = 1;
unsigned int specularNr = 1;
unsigned int normalNr = 1;
unsigned int heightNr = 1;
for(unsigned int i = 0; i < textures.size(); i++)
{
glActiveTexture(GL_TEXTURE0 + i); // active proper texture unit before binding
// retrieve texture number (the N in diffuse_textureN)
string number;
string name = textures[i].type;
if(name == "texture_diffuse")
number = std::to_string(diffuseNr++);
else if(name == "texture_specular")
number = std::to_string(specularNr++); // transfer unsigned int to string
else if(name == "texture_normal")
number = std::to_string(normalNr++); // transfer unsigned int to string
else if(name == "texture_height")
number = std::to_string(heightNr++); // transfer unsigned int to string
// now set the sampler to the correct texture unit
glUniform1i(glGetUniformLocation(shader.ID, (name + number).c_str()), i);
// and finally bind the texture
glBindTexture(GL_TEXTURE_2D, textures[i].id);
}
// draw mesh
glBindVertexArray(VAO);
glDrawElements(GL_TRIANGLES, static_cast<unsigned int>(indices.size()), GL_UNSIGNED_INT, 0);
glBindVertexArray(0);
// always good practice to set everything back to defaults once configured.
glActiveTexture(GL_TEXTURE0);
}
private:
// render data
unsigned int VBO, EBO;
// initializes all the buffer objects/arrays
void setupMesh()
{
// create buffers/arrays
glGenVertexArrays(1, &VAO);
glGenBuffers(1, &VBO);
glGenBuffers(1, &EBO);
glBindVertexArray(VAO);
// load data into vertex buffers
glBindBuffer(GL_ARRAY_BUFFER, VBO);
// A great thing about structs is that their memory layout is sequential for all its items.
// The effect is that we can simply pass a pointer to the struct and it translates perfectly to a glm::vec3/2 array which
// again translates to 3/2 floats which translates to a byte array.
glBufferData(GL_ARRAY_BUFFER, vertices.size() * sizeof(Vertex), &vertices[0], GL_STATIC_DRAW);
glBindBuffer(GL_ELEMENT_ARRAY_BUFFER, EBO);
glBufferData(GL_ELEMENT_ARRAY_BUFFER, indices.size() * sizeof(unsigned int), &indices[0], GL_STATIC_DRAW);
// set the vertex attribute pointers
// vertex Positions
glEnableVertexAttribArray(0);
glVertexAttribPointer(0, 3, GL_FLOAT, GL_FALSE, sizeof(Vertex), (void*)0);
// vertex normals
glEnableVertexAttribArray(1);
glVertexAttribPointer(1, 3, GL_FLOAT, GL_FALSE, sizeof(Vertex), (void*)offsetof(Vertex, Normal));
// vertex texture coords
glEnableVertexAttribArray(2);
glVertexAttribPointer(2, 2, GL_FLOAT, GL_FALSE, sizeof(Vertex), (void*)offsetof(Vertex, TexCoords));
// vertex tangent
glEnableVertexAttribArray(3);
glVertexAttribPointer(3, 3, GL_FLOAT, GL_FALSE, sizeof(Vertex), (void*)offsetof(Vertex, Tangent));
// vertex bitangent
glEnableVertexAttribArray(4);
glVertexAttribPointer(4, 3, GL_FLOAT, GL_FALSE, sizeof(Vertex), (void*)offsetof(Vertex, Bitangent));
// ids
glEnableVertexAttribArray(5);
glVertexAttribIPointer(5, 4, GL_INT, sizeof(Vertex), (void*)offsetof(Vertex, m_BoneIDs));
// weights
glEnableVertexAttribArray(6);
glVertexAttribPointer(6, 4, GL_FLOAT, GL_FALSE, sizeof(Vertex), (void*)offsetof(Vertex, m_Weights));
glBindVertexArray(0);
}
};
#endif //ENGINE2026_MESH_H

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#ifndef ENGINE2026_MODEL_H
#define ENGINE2026_MODEL_H
#include <glad/glad.h>
#include <glm/glm.hpp>
#include <glm/gtc/matrix_transform.hpp>
#include <stb/stb_image.h>
#include <assimp/Importer.hpp>
#include <assimp/scene.h>
#include <assimp/postprocess.h>
#include <engine/mesh.h>
#include <engine/shader.h>
#include <string>
#include <fstream>
#include <sstream>
#include <iostream>
#include <map>
#include <vector>
#include <filesystem>
using namespace std;
unsigned int TextureFromFile(const char *path, const string &directory, bool gamma = false);
class Model
{
public:
// model data
vector<Texture> textures_loaded; // stores all the textures loaded so far, optimization to make sure textures aren't loaded more than once.
vector<Mesh> meshes;
string directory;
bool gammaCorrection;
// constructor, expects a filepath to a 3D model.
Model(string const &path, bool gamma = false) : gammaCorrection(gamma)
{
loadModel(path);
}
// draws the model, and thus all its meshes
void Draw(Shader &shader)
{
for(unsigned int i = 0; i < meshes.size(); i++)
meshes[i].Draw(shader);
}
private:
// loads a model with supported ASSIMP extensions from file and stores the resulting meshes in the meshes vector.
void loadModel(string const &path)
{
// read file via ASSIMP
Assimp::Importer importer;
const aiScene* scene = importer.ReadFile(path, aiProcess_Triangulate | aiProcess_GenSmoothNormals | aiProcess_FlipUVs | aiProcess_CalcTangentSpace);
// check for errors
if(!scene || scene->mFlags & AI_SCENE_FLAGS_INCOMPLETE || !scene->mRootNode) // if is Not Zero
{
cout << "ERROR::ASSIMP:: " << importer.GetErrorString() << endl;
return;
}
// retrieve the directory path of the filepath
directory = path.substr(0, path.find_last_of('/'));
// process ASSIMP's root node recursively
processNode(scene->mRootNode, scene);
}
// 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).
void processNode(aiNode *node, const aiScene *scene)
{
// process each mesh located at the current node
for(unsigned int i = 0; i < node->mNumMeshes; i++)
{
// the node object only contains indices to index the actual objects in the scene.
// the scene contains all the data, node is just to keep stuff organized (like relations between nodes).
aiMesh* mesh = scene->mMeshes[node->mMeshes[i]];
meshes.push_back(processMesh(mesh, scene));
}
// after we've processed all of the meshes (if any) we then recursively process each of the children nodes
for(unsigned int i = 0; i < node->mNumChildren; i++)
{
processNode(node->mChildren[i], scene);
}
}
Mesh processMesh(aiMesh *mesh, const aiScene *scene)
{
// data to fill
vector<Vertex> vertices;
vector<unsigned int> indices;
vector<Texture> textures;
// walk through each of the mesh's vertices
for(unsigned int i = 0; i < mesh->mNumVertices; i++)
{
Vertex vertex;
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.
// positions
vector.x = mesh->mVertices[i].x;
vector.y = mesh->mVertices[i].y;
vector.z = mesh->mVertices[i].z;
vertex.Position = vector;
// normals
if (mesh->HasNormals())
{
vector.x = mesh->mNormals[i].x;
vector.y = mesh->mNormals[i].y;
vector.z = mesh->mNormals[i].z;
vertex.Normal = vector;
}
// texture coordinates
if(mesh->mTextureCoords[0]) // does the mesh contain texture coordinates?
{
glm::vec2 vec;
// a vertex can contain up to 8 different texture coordinates. We thus make the assumption that we won't
// use models where a vertex can have multiple texture coordinates so we always take the first set (0).
vec.x = mesh->mTextureCoords[0][i].x;
vec.y = mesh->mTextureCoords[0][i].y;
vertex.TexCoords = vec;
// tangent
vector.x = mesh->mTangents[i].x;
vector.y = mesh->mTangents[i].y;
vector.z = mesh->mTangents[i].z;
vertex.Tangent = vector;
// bitangent
vector.x = mesh->mBitangents[i].x;
vector.y = mesh->mBitangents[i].y;
vector.z = mesh->mBitangents[i].z;
vertex.Bitangent = vector;
}
else
vertex.TexCoords = glm::vec2(0.0f, 0.0f);
vertices.push_back(vertex);
}
// now wak through each of the mesh's faces (a face is a mesh its triangle) and retrieve the corresponding vertex indices.
for(unsigned int i = 0; i < mesh->mNumFaces; i++)
{
aiFace face = mesh->mFaces[i];
// retrieve all indices of the face and store them in the indices vector
for(unsigned int j = 0; j < face.mNumIndices; j++)
indices.push_back(face.mIndices[j]);
}
// process materials
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
vector<Texture> diffuseMaps = loadMaterialTextures(material, aiTextureType_DIFFUSE, "texture_diffuse", true);
textures.insert(textures.end(), diffuseMaps.begin(), diffuseMaps.end());
// 2. specular maps
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 a mesh object created from the extracted mesh data
return Mesh(vertices, indices, textures);
}
// checks all material textures of a given type and loads the textures if they're not loaded yet.
// the required info is returned as a Texture struct.
vector<Texture> loadMaterialTextures(aiMaterial *mat, aiTextureType type, string typeName, bool fallback = false)
{
vector<Texture> textures;
for(unsigned int i = 0; i < mat->GetTextureCount(type); i++)
{
aiString str;
mat->GetTexture(type, i, &str);
// check if texture was loaded before and if so, continue to next iteration: skip loading a new texture
bool skip = false;
for(unsigned int j = 0; j < textures_loaded.size(); j++)
{
if(std::strcmp(textures_loaded[j].path.data(), str.C_Str()) == 0)
{
textures.push_back(textures_loaded[j]);
skip = true; // a texture with the same filepath has already been loaded, continue to next one. (optimization)
break;
}
}
if(!skip)
{ // if texture hasn't been loaded already, load it
Texture texture;
texture.id = TextureFromFile(str.C_Str(), this->directory);
texture.type = typeName;
texture.path = str.C_Str();
textures.push_back(texture);
textures_loaded.push_back(texture); // store it as texture loaded for entire model, to ensure we won't unnecessary load duplicate textures.
}
}
// Load DefaultTexture if there isn't one already
if (mat->GetTextureCount(type) == 0) {
string defaultPath = "DefaultTexture.jpg";
Texture texture;
texture.id = TextureFromFile(defaultPath.c_str(), "assets/");
texture.type = typeName;
texture.path = defaultPath;
textures.push_back(texture);
textures_loaded.push_back(texture);
}
return textures;
}
};
unsigned inline int TextureFromFile(const char *path, const string &directory, bool gamma)
{
string filename = string(path);
filename = directory + '/' + filename;
unsigned int textureID;
glGenTextures(1, &textureID);
int width, height, nrComponents;
unsigned char *data = stbi_load(filename.c_str(), &width, &height, &nrComponents, 0);
if (data)
{
GLenum format;
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);
}
else
{
std::cout << "Texture failed to load at path: " << path << std::endl;
stbi_image_free(data);
}
return textureID;
}
#endif //ENGINE2026_MODEL_H

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engine/shader.h
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#ifndef SHADER_H
#define SHADER_H
#include <glad/glad.h>
#include <string>
#include <fstream>
#include <sstream>
#include <iostream>
class Shader
{
public:
// Compiled Shader Program ID
unsigned int ID;
Shader(const char* vertexPath, const char* fragmentPath)
{
std::string vertexCode, fragmentCode;
std::ifstream vertexFile, fragmentFile;
vertexFile.exceptions (std::ifstream::failbit | std::ifstream::badbit);
fragmentFile.exceptions (std::ifstream::failbit | std::ifstream::badbit);
try
{
// Open the files
vertexFile.open(vertexPath);
fragmentFile.open(fragmentPath);
std::stringstream vertexStream, fragmentStream;
// Save the contents to our streams
vertexStream << vertexFile.rdbuf();
fragmentStream << fragmentFile.rdbuf();
// Close files
vertexFile.close();
fragmentFile.close();
// Save the contents to our strings
vertexCode = vertexStream.str();
fragmentCode = fragmentStream.str();
// Fix encoding issues, specifically for Linux
//vertexCode.erase(std::remove(vertexCode.begin(), vertexCode.end(), '\r'), vertexCode.end());
//fragmentCode.erase(std::remove(fragmentCode.begin(), fragmentCode.end(), '\r'), fragmentCode.end());
}
catch (std::ifstream::failure& e)
{
std::cout << "ERROR::SHADER::FILE_NOT_SUCCESSFULLY_READ: " << e.what() << std::endl;
}
const char* vertexShaderSource = vertexCode.c_str();
const char* fragmentShaderSource = fragmentCode.c_str();
unsigned int vertexShader;
vertexShader = glCreateShader(GL_VERTEX_SHADER);
glShaderSource(vertexShader, 1, &vertexShaderSource, NULL);
glCompileShader(vertexShader);
checkCompileErrors(vertexShader, "VERTEX");
unsigned int fragmentShader;
fragmentShader = glCreateShader(GL_FRAGMENT_SHADER);
glShaderSource(fragmentShader, 1, &fragmentShaderSource, NULL);
glCompileShader(fragmentShader);
checkCompileErrors(fragmentShader, "FRAGMENT");
ID = glCreateProgram();
glAttachShader(ID, vertexShader);
glAttachShader(ID, fragmentShader);
glLinkProgram(ID);
checkCompileErrors(ID, "PROGRAM");
glDeleteShader(vertexShader);
glDeleteShader(fragmentShader);
}
void Use()
{
glUseProgram(ID);
};
// Setters
void setBool(const std::string &name, bool value) const
{
glUniform1i(glGetUniformLocation(ID, name.c_str()), (int)value);
}
// ------------------------------------------------------------------------
void setInt(const std::string &name, int value) const
{
glUniform1i(glGetUniformLocation(ID, name.c_str()), value);
}
// ------------------------------------------------------------------------
void setFloat(const std::string &name, float value) const
{
glUniform1f(glGetUniformLocation(ID, name.c_str()), value);
}
// ------------------------------------------------------------------------
void setVec2(const std::string &name, const glm::vec2 &value) const
{
glUniform2fv(glGetUniformLocation(ID, name.c_str()), 1, &value[0]);
}
void setVec2(const std::string &name, float x, float y) const
{
glUniform2f(glGetUniformLocation(ID, name.c_str()), x, y);
}
// ------------------------------------------------------------------------
void setVec3(const std::string &name, const glm::vec3 &value) const
{
glUniform3fv(glGetUniformLocation(ID, name.c_str()), 1, &value[0]);
}
void setVec3(const std::string &name, float x, float y, float z) const
{
glUniform3f(glGetUniformLocation(ID, name.c_str()), x, y, z);
}
// ------------------------------------------------------------------------
void setArr(const std::string &name, const GLint value[], const int &count) const
{
glUniform1iv(glGetUniformLocation(ID, name.c_str()), count, value);
}
// ------------------------------------------------------------------------
void setVec4(const std::string &name, const glm::vec4 &value) const
{
glUniform4fv(glGetUniformLocation(ID, name.c_str()), 1, &value[0]);
}
void setVec4(const std::string &name, float x, float y, float z, float w) const
{
glUniform4f(glGetUniformLocation(ID, name.c_str()), x, y, z, w);
}
// ------------------------------------------------------------------------
void setMat2(const std::string &name, const glm::mat2 &mat) const
{
glUniformMatrix2fv(glGetUniformLocation(ID, name.c_str()), 1, GL_FALSE, &mat[0][0]);
}
// ------------------------------------------------------------------------
void setMat3(const std::string &name, const glm::mat3 &mat) const
{
glUniformMatrix3fv(glGetUniformLocation(ID, name.c_str()), 1, GL_FALSE, &mat[0][0]);
}
// ------------------------------------------------------------------------
void setMat4(const std::string &name, const glm::mat4 &mat) const
{
glUniformMatrix4fv(glGetUniformLocation(ID, name.c_str()), 1, GL_FALSE, &mat[0][0]);
}
void setDecal(int index, GLint tex, float opacity, const glm::vec4& uvCoords) const {
std::string indexStr = std::to_string(index);
GLint texLoc = glGetUniformLocation(ID, ("decals[" + indexStr + "].tex").c_str());
if (texLoc != -1) glUniform1i(texLoc, tex);
GLint opLoc = glGetUniformLocation(ID, ("decals[" + indexStr + "].opacity").c_str());
if (opLoc != -1) glUniform1f(opLoc, opacity);
GLint uvLoc = glGetUniformLocation(ID, ("decals[" + indexStr + "].uvCoords").c_str());
if (uvLoc != -1) {
glUniform4fv(uvLoc, 1, &uvCoords[0]);
}
}
private:
void checkCompileErrors(unsigned int shader, std::string type)
{
int success;
char infoLog[1024];
if (type != "PROGRAM")
{
glGetShaderiv(shader, GL_COMPILE_STATUS, &success);
if (!success)
{
glGetShaderInfoLog(shader, 1024, NULL, infoLog);
std::cout << "ERROR::SHADER_COMPILATION_ERROR of type: " << type << "\n" << infoLog << "\n -- --------------------------------------------------- -- " << std::endl;
}
}
else
{
glGetProgramiv(shader, GL_LINK_STATUS, &success);
if (!success)
{
glGetProgramInfoLog(shader, 1024, NULL, infoLog);
std::cout << "ERROR::PROGRAM_LINKING_ERROR of type: " << type << "\n" << infoLog << "\n -- --------------------------------------------------- -- " << std::endl;
}
}
}
};
#endif

53
engine/texture.h
View file

@ -1,53 +0,0 @@

#include <iostream>
#include <glad/glad.h>
#define STB_IMAGE_IMPLEMENTATION
#include <stb/stb_image.h>
class Texture
{
public:
unsigned int ID;
int width, height, nrChannels;
Texture(const char* texturePath, bool flip = false)
{
// Create the Texture and set our ID
glGenTextures(1, &ID);
glBindTexture(GL_TEXTURE_2D, ID);
// set the texture wrapping/filtering options (on the currently bound texture object)
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_NEAREST);
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_NEAREST);
// Grab the texture from our path
if (flip)
stbi_set_flip_vertically_on_load(true);
unsigned char *data = stbi_load(texturePath, &width, &height, &nrChannels, 0);
if (data)
{
GLenum format = (nrChannels == 4) ? GL_RGBA : GL_RGB;
glTexImage2D(GL_TEXTURE_2D, 0, format, width, height, 0, format, GL_UNSIGNED_BYTE, data);
glGenerateMipmap(GL_TEXTURE_2D);
}
else
{
std::cout << "Failed to load texture" << std::endl;
}
if (flip)
stbi_set_flip_vertically_on_load(false);
stbi_image_free(data);
}
void Draw() const
{
glActiveTexture(GL_TEXTURE0);
glBindTexture(GL_TEXTURE_2D, ID);
}
};

40
game/game.cpp
View file

@ -1,23 +1,54 @@
#include <iostream>
#include <engine/Backend/Shader.h>
#include <engine/Backend/Camera.h>
#include <engine/Backend/Model.h>
#include <glad/glad.h>
#include <optional>
#include <glm/gtc/matrix_transform.hpp>
namespace game
{
const int SCREEN_WIDTH = 1366;
const int SCREEN_HEIGHT = 768;
std::optional<Shader> shader;
std::optional<Model> model;
std::optional<Camera> camera;
float lastX = SCREEN_WIDTH / 2.0f;
float lastY = SCREEN_HEIGHT / 2.0f;
bool firstMouse = true;
bool Init()
{
shader.emplace("assets/shaders/basicVertex.vert", "assets/shaders/basicFragment.frag");
shader->Use();
camera.emplace(glm::vec3(0.0f, 0.0f, 0.0f));
model.emplace("assets/models/sponza/Sponza.gltf");
return true;
}
void PreFrame()
{
glClearColor(0.2f, 0.3f, 0.3f, 1.0f);
glClear(GL_COLOR_BUFFER_BIT);
shader->Use();
camera->Update(shader.value(), SCREEN_WIDTH, SCREEN_HEIGHT);
}
void Render()
{
glClearColor(0.2f, 0.3f, 0.3f, 1.0f);
glClear(GL_COLOR_BUFFER_BIT);
glm::mat4 modelTransform = glm::mat4(1.0f);
modelTransform = glm::translate(modelTransform, glm::vec3(0.0f, 0.0f, 0.0f));
modelTransform = glm::scale(modelTransform, glm::vec3(0.02f, 0.02f, 0.02f));
shader->setMat4("model", modelTransform);
model->Draw(shader.value());
}
void Update()
@ -34,4 +65,5 @@ namespace game
{
}
}
}