2017-05-13 19:19 GMT+02:00 Jason Ekstrand <ja...@jlekstrand.net>: > Jonas, > > Welcome to mesa-dev! > > On May 11, 2017 12:08:01 PM Jonas Kulla <nyocu...@gmail.com> wrote: > > > Hello everyone, > > > > I'm a student who's looking to create a small Vulkan demo for my computer > > graphics class; my laptop (CPU: Intel N3540) has an integrated Bay Trail > > chip if I looked that up right, which should be capable of supporting > > Vulkan. > > > Yes, that is a Bay Trail which can mostly support Vulkan. (More on that > later.) > > > > I saw that Bay Trail support in anv is marked "experimental", and indeed > > running vulkaninfo crashes with > > > > info.c:518: failed with VK_ERROR_INITIALIZATION_FAILED > > > That doesn't seem right. I don't know that I've ever fired up our driver > on a Bay Trail personally but it should mostly work. I guess you've found > the first step in your project. :-) Getting vulkaninfo working should be > easy. Just set a breakpoint in the driver and figure out why it's throwing > VK_ERROR_INITIALIZATION_FAILED. If you have a debug build it will > probably even print the reason out to stderr for you. >
Yep, was planning on attacking that first. Already noticed that you guys have sprinkled anv_physical_device_init() with lots of helpful error messages hidden behind DEBUG :) > > > I was wondering if someone could comment on how much work would be > > involved in completing the Bay Trail code in anv, and if it's not too > much, > > whether someone would be willing to offer me light mentorship in doing > > so. > > Bay trail should be working basically exactly as well as Ivy Bridge which > means lots of stuff should run though it won't be close to conformant. > What's missing? First off, there's probably a bunch of regular bug-fixing > to do. Most of the gen7 code is shared with gen8 but there are still a > bunch of gen7 bugs that no one has bothered to track down. It shouldn't be > too bad as we do run Haswell in our CI system and it's down to a couple > hundred CTS fails last I checked. Fortunately, the Vulkan test suite is > fully open-source so you can easily download and run it once you get > vulkaninfo working. > > Beyond just bugfixing, there are also a number of core Vulkan features for > which gen7 lacks hardware support. Most of these are features we expose in > GL so we have some sort of workaround. The workarounds will have to be > ported to Vulkan somehow (though it may not be the same workaround in the > end). Off the top of my head: > > - Texture Swizzle > - Stencil Texturing > - Some missing VkFormats > - vkCmdWaitEvent > - Missing the MI_MATH stuff required for queries > > There may be more that I'm just not remembering. > > > > > I'm mostly comfortable with OpenGL and general graphics / GPU concepts, > > but I have no experience in driver code aside from following Mesa > > development > > as a bystander. > > > Everyone starts somewhere. Feel free to dive right in and give it a go! > If you have any questions along the way, the best way to get answers is > probably to ask them on #dri-devel or #intel-gfx on IRC. I'm usually on > (nick: jekstrand) and am happy to answer questions. > > --Jason > Thank you so much Jason! Will probably hit you up in the coming weeks. Jonas
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