John Parsaie

LunarG at XDC 2025: KosmicKrisp Overview - LunarG At XDC 2025 in Vienna, LunarG's Aitor Camacho Larrondo presented an overview of KosmicKrisp, a new Vulkan-to-Metal Mesa driver.

Try KosmicKrisp (upcoming MoltenVK replacement 🙂) and tell us how it is!

www.lunarg.com/lunarg-at-xd...

For a while I was going 100% Vulkan and using MoltenVK to reach macOS for a project, but switched to NRI a couple years ago and have had a good time. The maintainer is also really responsive.

New blog post! In "Billions of triangles in minutes" we'll walk through hierarchical cluster level of detail generation of, well, billions of triangles in minutes. Reposts welcome!

zeux.io/2025/09/30/b...

That feeling when the superluminal trace is a green wall

RenderDoc v1.40 is now available! This version includes support for VK_EXT_descriptor_buffer, and vulkan 1.4, as well as some other bug fixes an quality of life improvements.

Full release notes: github.com/baldurk/rend...

Binary builds: renderdoc.org/builds

Symbol look up happens at creation time (just using backtrace-cpp lib for that. C++23 did bring <stacktrace> but it wasn’t very stable for me)

I will dust it off and publish it soon, I have been meaning to do something similar for DRED breadcrumbs as well for better GPU hang analysis

Finally snapped: made a Vulkan layer that auto-labels objects with a stack trace at creation time. Now the validation layer can just tell me what I forgot to release on vkDestroyDevice :)

#SIGGRAPH2025 Advances talks slides sharing: "Strand-based hair and fur rendering in Indiana Jones and the Great Circle" by Sergei Kulikov from Machine games is now online advances.realtimerendering.com/s2025/index....

a man in a suit and tie with his arms in the air and the words it 's happening ALT: a man in a suit and tie with his arms in the air and the words it 's happening

Downloading pre-compiled shaders on PC????

devblogs.microsoft.com/directx/intr...

As the date for the 20th anniversary of Advances is coming, I realized some content was missing.
Posted 2007 and 2008 courses online - check them out!

advances.realtimerendering.com

Quick! Back to ImGui!

Probably the most important Vulkan update since dynamic rendering is live!

docs.vulkan.org/features/lat...

Modern strand-based hair systems typically offer a length-wise per-strand UV coordinate, so it's technically doable. You would somehow need to parameterize the texture lookup based on a function of <strand ID, strand UV>

I just published my new article:
The Secrets of Floating-Point Numbers
asawicki.info/articles/sec...

Same for Vulkan and the VVL!

Oh I was on the southbound one, just realized in the screenshot you are walking north

I am literally on this exact bus right now

C++ Dynamic Debugging: Full Debuggability for Optimized Builds - C++ Team Blog Over the past 5 years, we’ve had many incredible opportunities to engage with game developers. From AAA studios to indie developers, the passion for slashing iteration times is significant. Amidst all...

Never building debug binaries again :)

devblogs.microsoft.com/cppblog/cpp-...

My next hobby path tracer will require an internet connection and draw random samples from www.random.org/decimal-frac... (/s)

"Thus one nit is one lux per steradian is one candela per square meter is on lumen per square meter per steradian. Got it?" - Jim Kajiya

(Annual reread of PBRT Radiometry chapter because I keep forgetting)

GitHub - FFmpeg/asm-lessons: FFMPEG Assembly Language Lessons FFMPEG Assembly Language Lessons. Contribute to FFmpeg/asm-lessons development by creating an account on GitHub.

TIL that because the FFmpeg project has gained so much experience in hand-writing assembly code to provide huge speedups, they now are putting together a series of lessons for learning assembly:

Vibe coding is fun and all, but this is probably a better use of time!

github.com/FFmpeg/asm-l...

This rocks

This is the amount of shader ISA code the compiler produces for a single atan2(). Avoid using it for time critical code.

Well, it wound up taking nearly the rest of my holiday, but I finished adding multi-pass support to my image quality reference tool's ShaderToy input mode.

Debugging multi-pass support at the moment, exposed an option to write the HLSL to disk with spirv-cross. We normally go straight from SPIR-V to DXIL for the cross compilation but it can be helpful to look at the intermediate HLSL to sort out some issues.

Debugging multi-pass support at the moment, exposed an option to write the HLSL to disk with spirv-cross. We normally go straight from SPIR-V to DXIL for the cross compilation but it can be helpful to look at the intermediate HLSL to sort out some issues.

Publicly available graphics debugging tools are getting very good. However, I have not found any like GPUView, which allow viewing sw/hw queues from ETL traces. Sadly the UI is very poor. The Superluminal devs are probably in the best position to make a modern version of GPUView.

Sample Application for Direct3D 12 Flip Model Swap Chains D3D12 supports only flip model swap chains. This article helps you understand the parameters in a flip model swap chain, links to an application that lets you play with these parameters, and points yo...

This live visualization of queued CPU/GPU/Present timelines in this Intel demo app is neat:

www.intel.com/content/www/...

Actually, in the video the ymin=0, and the ymax=200%, however I changed them to the previous tweet since it looks a bit less jittery.