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Coffee Engine

·594 words·3 mins·
C++ OpenGL Game Engine
Table of Contents

Coffee Engine is a small game engine made from scratch by Hugo Planell Moreno and myself as a personal and academic project, with the purpose of learning more in-depth about how game engines work.

This project started as a summer experiment and later became the foundation for the Game Engine course in the third year of the CITM Game Design and Development Bachelor’s Degree. The project received the highest distinction in the course (Matrícula de Honor), achieving a perfect score (10/10).

It was also selected as the official engine for the entire class of 40 students to develop a game as part of the Project 3 subject. To learn more about that project, you can read the post about Warhammer 40,000: The Last Marine here.

Features
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Architecture
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  • CoffeeEngine Core Library: Modular engine architecture
  • CoffeeEditor: Full-featured game editor
  • Cross-Platform Support: Windows and Linux compatibility

Rendering
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3D Rendering
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  • Forward Rendering Pipeline: Modern Renderer3D implementation
  • PBR Materials: Physically-based rendering workflow
  • Shader Materials: Custom shader support
  • Textures: Complete texture loading and management
  • Skybox: HDR environment mapping
  • HDR Rendering: High dynamic range pipeline

Post-Processing
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  • FXAA: Fast approximate anti-aliasing
  • Bloom: Physically Based Bloom
  • Fog: Atmospheric depth rendering
  • Tone Mapping: AgX tone mapping for cinematic color

Lighting & Shadows
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  • Directional Lights: Sun-like lighting with shadows
  • Point Lights (Omni): 360-degree light sources
  • Spot Lights: Cone-based directional lighting
  • Directional Shadows: Real-time shadow mapping
  • Image-Based Lighting (IBL): Environment lighting
  • Frustum Culling: Octree-based optimization

2D Rendering
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  • Renderer2D: Optimized 2D sprite rendering
  • 2D Batching: Automatic draw call optimization

Game Systems
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Entity Component System (ECS)
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  • EnTT Integration: High-performance entity management
  • Scene Tree: Hierarchical scene organization
  • Component System: Modular game object composition
  • Model Loading: 3D asset import and management

Animation System
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  • 3D Skeletal Animation: Bone-based character animation
  • Animation Blending: Smooth state transitions
  • Partial Animation Blending: Layer-based body part animation

Prefab System
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  • Reusable Templates: Component-based game object templates
  • Hierarchy Preservation: Parent-child relationships
  • Cross-Component References: Automatic reference integrity
  • Human-Readable Serialization: .prefab format with version control
  • Runtime Instantiation: Dynamic prefab spawning

Audio
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  • Wwise Integration: Professional audio middleware
  • 3D Spatial Audio: Positional audio with distance attenuation
  • RTPCs: Real-time parameter controls
  • Audio Banks & Events: Organized audio asset management
  • Auxiliary Sends: Game-defined audio routing

Navigation#

  • Pathfinding System: AI navigation with obstacle avoidance
  • Navmesh Generation: Automatic navigation mesh creation

Physics
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  • Bullet Physics Integration: Industry-standard physics simulation
  • Rigid Body System: Static, dynamic, and kinematic bodies
  • Collision Detection: Enter/stay/exit events with manifolds
  • Multiple Collider Types: Box, Sphere, Capsule, Cylinder, Cone
  • Raycasting API: Single/multiple hit detection
  • Physics Debugging: Visual collision shapes and raycast debug

Scripting
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  • Lua Integration: Sol2-powered C++/Lua interoperability
  • Advanced Bindings: Automatic type conversions and error handling
  • IntelliSense Support: Auto-generated stub files
  • Language-Agnostic Design: Extensible for additional languages
  • Entity Integration: Direct script binding to game objects

Development Tools
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Resource Management
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  • Asset Pipeline: Automatic import and processing
  • Resource Caching: Intelligent asset loading
  • Hot Reloading: Real-time asset updates

Editor Features
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  • Scene Hierarchy: Visual scene graph management
  • Component Inspectors: Real-time property editing
  • Asset Browser: Resource management interface
  • Viewport: 3D scene visualization

Profiling & Debugging
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  • Tracy Integration: Real-time performance profiling
  • Debug Rendering: Visual debugging systems
  • Console & Logging: Integrated debugging tools

Serialization & Persistence
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  • Scene Serialization: Complete scene save/load system
  • Cereal Library: Robust versioned serialization

Technologies Used
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  • C++
  • OpenGL
  • Assimp
  • EnTT
  • GLM
  • ImGuizmo
  • NativeFileDialog-Extended
  • Sol2
  • Tracy
  • Cereal
  • FMT
  • ImGui
  • Lua
  • SDL3
  • SPDLOG
  • Bullet3
  • Wwise

Explore the Project
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You can find more about the project on various platforms:

Thank you for exploring Coffee Engine!