GLSL VS vulkan-guide

You're looking for this repo

You have access to physical (u64) global memory pointers through buffer_reference in GLSL, note you should be using buffer_reference2

On April 27, 2023 the Vulkan® Ray Tracing TSG released the VK_KHR_ray_tracing_position_fetch extension, which exposes the ability to fetch vertex positions from an acceleration structure hit when tracing rays. The SPIR-V SPV_KHR_ray_tracing_position_fetch and GLSL GL_EXT_ray_tracing_position_fetch extensions have also been released to provide SPIR-V and GLSL support for this functionality.

You can also have general extensions that are only supported on some hardware, for instance NVIDIA supports all of these extensions on OpenGL that add support for Vulkan's thread subgroup operations while AMD only supports these extensions and a few others that add support for similar features to the extension that NVIDIA supports, but with way more restrictions.

GL_NV_ray_tracing is a vendor extension, but it does exist.

According to this document, one should be able to extract those values through

The reports of my death are greatly exaggerated

https://github.com/KhronosGroup/GLSL/blob/master/extensions/...

I don't think there's away. For Vulkan, there's GL_EXT_nonuniform_qualifier which allows you to index with gl_InstanceIndex but AFAIK it's not available for OpenGL.

AMD hardware works a little differently, and for that you have to write a waterfall loop with subgroup instructions to get the correct behavior (since GL_EXT_nonuniform_qualifier doesn't exist in OpenGL GLSL). The loop might look like this (you would use it the same way as NonUniformEXT in Vulkan GLSL).

I totally agree, and so do the people working on it as well as some of the volunteers who write tutorials.

There's an ongoing effort to create beginner friendly introductory material which was discussed in the recent Vulkanised conference. And an effort to make a better documentation site that's easier to browse than the specification.

On the volunteer front, there's a Vulkan 1.3 -based introductory tutorial (work in progress) over at https://vkguide.dev/

I think there should be a Vulkan tutorial that doesn't start with the boring stuff of initialization and window creation. It's stuff that you write once and forget about, and nothing particularly interesting happens in it.

Looking at my hobby project, excluding the boring stuff (which is reusable), a "hello compute" example is around 100 LOC and a "hello triangle" around 120 LOC. GLSL shader sources included.

Maybe someday I'll get around to writing a "learn Vulkan the hard way" blog post with examples.

Also, use https://vkguide.dev/ rather than vulkan-tutorial.

Once you're beyond the "introductory" phase, resources become more specialized based on what you'd like to learn -- there are Vulkan tutorials like https://vkguide.dev/ which will teach you the API and also give a bit more insight in how modern GPU hardware is structured, there are books like the "GPU Zen" series that do deep-dives on specific techniques, and there are tons of recorded GDC and SIGGRAPH talks on interesting new techniques. :)

Personally, I'm a hands on learner who actually wants to use this stuff in my career, so I'd recommend these tutorials: https://learnopengl.com/ https://vulkan-tutorial.com/Overview https://vkguide.dev/

vkguide teaches some good practices regarding code/renderer structure, but I'm afraid it doesn't go as deep as you'd like. It's certainly deeper than most other tutorials, though.

https://vkguide.dev/ This is my favorite.