Limitless Engine is a 3D graphics engine, focused on high-performance, low-overhead rendering with modern OpenGL & C++17.

Core Features

• OpenGL state caching for reducing driver overhead
• Multithreaded OpenGL context resource sharing
• Shader Compiler & Shader Program introspection
• Indexed buffers automatic binding
• Textures automatic binding
• Texture Compression support
• Time queries
• Buffer data streaming: Orphaning, Unsynchonized, Persistent, Coherent, TrippleBuffering, Explicit synchronization
• Extension support:
  • GL_ARB_buffer_storage
  • GL_ARB_direct_state_access
  • GL_ARB_shader_storage_buffer_object
  • GL_ARB_shading_language_420pack
  • GL_ARB_explicit_uniform_location
  • GL_ARB_tessellation_shader
  • GL_ARB_program_interface_query
  • GL_ARB_texture_storage
  • GL_ARB_bindless_texture
  • GL_EXT_texture_filter_anisotropic
  • GL_EXT_texture_compression_s3tc
  • GL_ARB_texture_compression_bptc
  • GL_ARB_texture_compression_rgtc

https://github.com/hotstreams/limitless-engine/assets/37740577/89b6e76b-e033-4644-829c-9abc744a2341

https://github.com/hotstreams/limitless-engine/assets/37740577/e8ac6aed-a6f1-4125-b2bc-b67584bbaf93

Rendering

• Forward & Deferred rendering
• Cook-Torrance microfacet specular BRDF
• Lambertian diffuse BRDF
• Roughness-Metallic workflow
• Translucent materials
• Normal mapping
• Ambient occlusion mapping
• Dynamic directional light, point lights and spot lights
• Directional Cascade Shadow maps
• Percentage-Closer Filtering
• Skybox
• Screen space ambient occlusion
• Screen space reflections
• Screen space refraction
• Tone mapping
• Gamma correction
• HDR Bloom
• FXAA
• Deferred Decals
• Instancing

Material System

• Lit, unlit shading models
• Base color (scalar, texture)
• Metallic (scalar, texture)
• Roughness (scalar, texture)
• Refraction
• Normal
• Emissive color
• Emissive mask
• Blend mask
• Ambient occlusion
• Transparency: Translucent, Additive, Modulate
• Material layering
• Custom materials via GLSL snippets that allow you to create whatever material you want
• All properties are run-time changeable

Effect System

• Sprite, Mesh, Beam emitters
• Initial, By life modules types
• Const, Range value distributions
• Interoperation with material custom properties
• Modules:
  • Color
  • Location
  • Velocity
  • Acceleration
  • Size
  • Lifetime
  • Mesh location
  • Mesh attachment
  • Rotation
  • Rotation rate
  • Custom material
  • Beam targets, speed, offset, rebuild, displacement

Examples

Build

This project requires C++17 compiler and CMake.

1. After cloning this Git repo, initialize its Git submodules, which contain 3rd party dependencies and build glew extensions:

git submodule init
git submodule update
cd thirdparty/glew
make extensions

2. Create a new directory for resulting build and start it:

mkdir build && cd build
cmake ..
make -j12 limitless-materials limitless-effects limitless-lighting

Dependencies

• glfw3
• glew
• OpenGL
• glm
• stb_image
• stb_image_resize
• freetype