GLEngine

GLEngine is a C++ OpenGL graphics engine which aimed to be a skill, knowledge and possibly graphical showcase. It will support many graphical features, from something as basic as textures and shaders to deferred rendering, PBR and such.

Link to the demo reel : https://vimeo.com/200574427

Screenshots

• Example using Image-Based Lighting :

* G-Buffer structure :

Features

• Camera :

  • Movements
  • Zoom in/out
  • Exposure :
    • Aperture
    • Shutter speed
    • ISO
  • TODO : Other physically based camera parameters

• Textures :

  • Init/loading/binding from anywhere
  • Anisotropic Filtering
  • HDR
  • Cubemap

• Material :

  • PBR material pipeline :
    • Albedo
    • Normal
    • Roughness
    • Metalness
    • AO
  • TODO : Informations seamlessly sent to the G-Buffer

• Models/Meshes :

  • External models loading (.obj)
  • TODO : PBR material pipeline compliant
  • TODO : Revamp & debug to support kinda buggy models

• Basic Shapes :

  • Simple shape generation (quad, plane, cube)
  • Predefined array based
  • TODO : Shape topology computation (sphere...)

• Shaders :

  • Init/loading/binding from anywhere
  • G-Buffer support
  • PBR material pipeline compliant
  • TODO : UBOs

• Skybox :

  • 6-faced cubemap based
  • Screenquad based
  • Equirectangular/spherical maps
  • HDR
  • Deferred Rendering compliant

• Resources Manager :

  • TODO : Resources (textures, shaders, models, materials...) centralization

• Lights :

  • Point light
  • Directional light
  • TODO : Spot light

• Lighting :

  • Cook-Torrance BRDF
  • Deferred Rendering
  • TODO : Shadow-mapping (PCF/Variance)
  • TODO : Tiled Deferred Rendering (Compute shaders ?)

• PBR Pipeline :

  • BRDF :
    • Cook-Torrance model
    • Diffuse : Lambertian/Disney
    • Fresnel term : Schlick
    • Microfacet distribution : GGX
    • Geometry attenuation : GGX-Smith
  • Material pipeline using a roughness/metalness workflow
  • Image-Based Lighting (Epic split-sum method) :
    • Diffuse irradiance
    • Specular radiance

• Post-processing :

  • Scalable Ambient Obscurance (SAO)
  • FXAA
  • Motion Blur (camera/per-fragment)
  • Tonemapping (Reinhard, Filmic, Uncharted)
  • TODO : Bloom
  • TODO : Depth of Field
  • TODO : Screen-Space Reflections
  • TODO : Lens Flare
  • TODO : Eye Adaptation

• Utility :

  • GUI using ImGui
  • Basic/naive GPU profiling
  • G-Buffer visualization for debugging purpose
  • Borderless Fullscreen
  • TODO : Logging
  • TODO : CPU profiling
  • TODO : G-Buffer export as .png
  • TODO : GUI using Qt5 (which imply a whole project revamping)

How to use

GLEngine was written using Linux, QtCreator as the IDE, CMake 3.0+ as the building tool, OpenGL 4.0+ as the Graphics API and a C++11 compiler in mind.

Download the source, open the CMakeList.txt file with QtCreator, build the project, and everything should be ready to use.

• In GLEngine :
  • Hold the right mouse button to use the camera and its features
  • Toggle between the different buffers using the 1-9 buttons

Dependencies (included)

• Window & Input system : GLFW
• OpenGL Function Loader : GLAD
• OpenGL Mathematic Functions : GLM
• Image Loading : stb
• Mesh Loading : Assimp

Credits

• Joey de Vries (LearnOpenGL)
• Kevin Fung (Glitter)