| 25 Jul 2021 |
 pythonesque | In case people were wondering about progress | 23:44:55 |
| 26 Jul 2021 |
 kvark | alright, I'm going to finish the DX12 sprint on https://github.com/gfx-rs/wgpu/pull/1724 | 06:07:15 |
| kvark | I'm sure there are bugs hiding, incomplete Naga backend details, etc. But conceptually, we are miles ahead. A few months ago we were running the complex gfx-backend-dx12 on SPIRV-Cross. And now we are on a slick wgpu-hal-dx12 with pure Rust all the way. | 06:08:36 |
| kvark | time to catch up on the numerous issues Veloren team discovered | 06:09:41 |
| kvark | btw, together DX12 API backend + HLSL shader backend are 8K LOC. | 06:11:21 |
 cwfitzgerald | That's great to hear | 06:19:15 |
| cwfitzgerald | 8k is _tiny_ | 06:19:21 |
|  jonboj changed their display name from Jonas Bojesen to jonboj. | 06:20:42 |
| kvark | forgot that I still need that firstVetex/firstInstance logic, so I guess one more thing to do be fore switching off | 13:36:31 |
 niklaskorz | Following the progress of wgpu has always been super exciting 😄 looking forward to using it for my master thesis next semester | 13:55:30 |
| cwfitzgerald | In reply to @kvark:matrix.org
forgot that I still need that firstVetex/firstInstance logic, so I guess one more thing to do be fore switching off how're you going to deal with indirect? | 15:11:58 |
| kvark | great question! | 15:12:17 |
 Kangz | When doing validation you'd can copy into a larger buffer that also sets a root constant | 15:16:15 |
| kvark | how do you set it as a root constant if it's in a buffer? | 15:16:39 |
| cwfitzgerald | the validation compute shader would be copying to an internal buffer | 15:17:21 |
| kvark | the base instance is not allowed in WebGPU in indirect buffers, that's a bit helpful | 15:17:35 |
| kvark | we'd need the run-time to have a switch: "am I an indirect draw call?" and then picking either the root-overridden value or the other one... | 15:18:10 |
| cwfitzgerald | well wouldn't we be shipping the offset in a root constant anyway | 15:18:41 |
| kvark | we will, but we can't know this offset for indirect buffer call | 15:19:02 |
| kvark | so we'd have 2 different pieces of data in the shader: one set by root constants, and one coming in a buffer (CBV, I suppose). | 15:19:27 |
| Kangz | In D3D12 you can have indirect commands that are several commands. So in this case it would be "SetRootConstant" then "Draw" | 15:19:54 |
| kvark | the CBV part would be coming from the indirect call itself | 15:20:00 |
| cwfitzgerald | you could use execute indirect's ability to set root constants | 15:20:02 |
| kvark | I'm very not excited about using the indirect command buffers for this | 15:20:41 |
| cwfitzgerald | I am also very not excited about inserting validation compute shaders at all, especially for multi-draw-indirect | 15:23:44 |
| cwfitzgerald | what's your concern with using indirect? | 15:24:53 |
| kvark | I just wasn't sure how it would work | 15:29:36 |
| kvark | now looking at it again, maybe it's ok | 15:29:43 |
| kvark | we already use the indirect commands for ... indirect draws | 15:29:55 |
| kvark | so it's just a matter of making them more complex | 15:30:07 |
