We're hiring!
*

Zink: Summer Update & SIGGRAPH 2019

Erik Faye-Lund avatar

Erik Faye-Lund
July 25, 2019

Share this post:

Here's an overview of the recent changes in Zink since the previous post, as well as an exciting announcement!

What's new in the world of Zink?

OK, so I haven't been as good at making frequent updates on as I was hoping, but let's try to make up for it:

Since last time, there's quite a lot of things that has been resolved:

  • We now do proper control-flow. This means things like if-statements, for-loops etc. There might be some control-flow primitives missing still, but that's because I haven't encountered any use yet.
  • Alpha testing has been implemented.
  • Client-defined clip-planes has been implemented.
  • Support for gl_FrontFacing has been implemented.
  • Lowering of glPointSize() to gl_PointSize has been implemented. This means you can use glPointSize() to specify sizes instead of having to write the gl_PointSize-output from the vertex shader.
  • Support for gl_FragDepth has been implemented.
  • Two-sided lighting has been implemented.
  • Shadow-samplers has been implemented.
  • Support for 8-bit primitive indices has been implemented.
  • Occlusion queries has been implemented correctly across command buffers. This includes the ability to pause / restore queries.
  • The compiler has been ported to C.
  • The compiler no longer lowers IO, but instead process derefs directly.
  • The compiler now handles booleans properly. It's no longer lowering them to floats.
  • David Airlie has contributed lowering of glShadeModel(GL_FLAT) to flat interpolation qualifiers. This still doesn't give us the right result, because Vulkan only supports the first vertex as the provoking vertex, and OpenGL defaults to the last one. To resolve this in a reasonable way, we need to inject a geometry shader that reorders the vertices, but this hasn't been implemented yet. You can read more about this in this ticket.
  • … and a boat-load of smaller fixes. There's just too many to mention, really.

In addition to this, there's been a pretty significant rewrite, changing the overall design of Zink. The reason for this, was that I made some early design-mistakes, and after having piled a bit too many features on top of this, I decided that it would be better to get the fundamentals right first.

Sadly, not all features have been brought forward since the rewrite, so we're currently back to OpenGL 2.1 support. Fixing this is on my list of things I want to do, but I suspect that cleaning things up and upstreaming will take presedence over OpenGL 3.0 support.

And just to give you something neat to look at, here's Blender running using Zink:

Screenshot of Blender running Zink.

Khronos Vulkan BoF at SIGGRAPH 2019

Khronos has been nice enough to give me a slot in their Vulkan Sessions at the Khronos BoFs during SIGGRAPH 2019!

The talk will be a slightly less tech-heavy introduction to Zink, what it does and what the future holds. It will focus more on the motivation and use cases than the underlying technical difficulties compared to my previous talks.

So, if you're in the area please drop by! A conference pass is not required to attend the BoF, as it's not part of the official SIGGRAPH program


Visit Erik's blog.

Comments (2)

  1. QwertyChouskie:
    Jul 26, 2019 at 11:18 PM

    I'm curious to know if SuperTuxKart still runs properly after the re-write. It would be pretty cool to have STK running on next-gen consoles using Zink :)

    Reply to this comment

    Reply to this comment

    1. Erik Faye-Lund:
      Aug 08, 2019 at 06:57 PM

      Hi, sorry for not noticing this post before! Yeah, SuperTuxKart works like a charm for me, even faster than before :)

      Reply to this comment

      Reply to this comment


Add a Comment






Allowed tags: <b><i><br>Add a new comment:


Search the newsroom

Latest Blog Posts

ROCK Pi and an easy place: Panfrost & Wayland on a Rockchip board

06/08/2019

Ongoing work on the reverse-engineered Panfrost OpenGL ES driver for Arm Mali GPUs has turned the RK3399 SoC into a very attractive platform…

What's new in OpenXR 1.0 & Monado?

02/08/2019

As part of its unwavering commitment to open source and open standards, Collabora is proud to be part of bringing the recently-released…

Zink: Summer Update & SIGGRAPH 2019

25/07/2019

There's been quite a few updates to Zink, an OpenGL implementation on top of Vulkan, since I last wrote about it. Here's an overview of…

GStreamer in Oslo

18/07/2019

A little over a month and a half ago, Collaborans including Aaron Boxer, George Kiagiadakis, Guillaume Desmottes, Stéphane Cerveau and myself…

GNOME meets Panfrost

26/06/2019

In my last Panfrost blog post, I announced my internship goal: improve Panfrost to run GNOME3. GNOME is a popular Linux desktop making heavy…

Using dummy-hcd to play with USB gadgets

24/06/2019

Dummy_hcd which consists of a software-emulated host controller and a UDC chip. In other words, this means you can play with USB gadgets…

Open Since 2005 logo

We use cookies on this website to ensure that you get the best experience. By continuing to use this website you are consenting to the use of these cookies. To find out more please follow this link.

Collabora Ltd © 2005-2019. All rights reserved. Website sitemap.