steaklive / DXR-Sandbox-GI

Simple DirectX 12 toy framework for testing Global Illumination: Reflective Shadow Mapping, Light Propagation Volume, Voxel Cone Tracing, DXR

About

Simple C++/DX12 framework for my bachelor thesis "Dynamic real-time global illumination algorithms on modern GPU hardware and software" (paper).

Video: https://youtu.be/4YUWw8x4XXc

Features

• Deferred Rendering
• Shadow Mapping
• GI w/ Reflective Shadow Mapping (indirect diffuse)
• GI w/ Light Propagation Volume (indirect diffuse)
• GI w/ Voxel Cone Tracing (indirect diffuse + specular + AO)
• SSAO
• Asynchronous compute
• DXR: Reflections + Blur, Ambient Occlusion + Blur

Optimizations

Reflective Shadow Mapping:

• main pass in compute (+async)
• efficient upsample & blur of main pass' output in compute (+async)

Light Propagation Volumes:

• flux downsample in compute
• DX12 bundle for propagation passes

Voxel Cone Tracing:

• main pass in compute (+async)
• anisotropic mipmapping passes in compute (+async)
• efficient upsample & blur of main pass' output in compute (+async)

SSAO:

• TODO: downscaled version
• TODO: move to compute with LDS optimizations
• TODO: move to async

RTAO:

• TODO: replace blur with proper filtering

Comparison

No GI -> RSM -> LPV -> VCT -> offline path-tracer

Additional screenshots

Dependencies

• Assimp
• DirectXTK12
• ImGUI

Requirements

• VS2019
• DirectX12
• Windows 10 (1809+)
• latest Windows SDK
• NVIDIA GPU with RTX support (if using DXR)