IntroductionI have written a post explaining SPPM and implemented a DXR version of photon mapping (Screen Space Photon Mapping) based on the ray tracing gems. The purpose of this post is to describe h

OverviewGPUs use SIMT (single-instruction, multiple-thread) to execute the same instructions in several threads. GPGPU-Sim uses SIMT stack to simulate SIMT. SIMT stack is a single-path stack execution

IntroductionWe implement a GI algorithm combining ReSTIR and spatiotemporal filtering based on Unreal Engine and ReSTIR GI(SiGG 20). At first, we initial the reservoir samples using hardware raytracin

OverviewAMD Graphics driver has four levels. The first level is GNM application level. This level is implemented by the game engine or the game developer. After that, the user mode driver translates t

OverviewPSET4 is a tiny PlayStation 4 emulator. I wrote this project for graphics driver learning. There are many open source PS4 emulators, such as FPCS4 and GPCS4. These projects helped me greatly d

Acceleration Structure ConstructionBoth DXR and Vulkan RayTracing use bounding volume hierarchies (BVH) as acceleration structure, which is also commonly used for offline ray tracing. BVH is an object

OverviewASTC is a fixed-rate, lossy texture compression system that is designed to offer an unusual degree of flexibility and to support a very wide range of use cases, while providing better image qu

IntroductionThis project is part of HWRTL. HWRTL is a single file hardware ray tracing library containing GI baking, HLOD texture generation and DXR PVS generation. Firstly, we pack the lightmaps of e

IntroductionThis is a simplified Unreal Lumen GI implementation (SimLumen) based on Unreal’s Lumen GI. We have implemented most of Unreal Lumen’s features. To perform fast ray tracing, SimLumen builds