Vulkan stress test flicker.

[Dorian]

Hi,

There is a flickering corruption on Vulkan stress demo.
I think the issue is the same as in my previous topic: https://www.geeks3d.com/forums/index.php/topic,6552.0.html

Looking at init.lua sources of test, I see single uniform buffer updated in every frame:

Code Select Expand

function update_scene(time)
  gh_camera.set_position(camera, 0, 0, 20)
  gh_camera.set_lookat(camera, 0, 0, 0, 1)
  UpdateCameraTransform(ub1, camera) 
  Update_Meshes(g_num_x, g_num_y, time)
end 

So I guess, the same fix as in tesselation demo has to be applied.

GPU is a Intel Ice Lake.

[JeGX]

Yes it's the same problem: one uniform buffer shared by several command buffers.
I will update the demo asap.

[JeGX]

I updated the Vulkan demopack with a new demo that should fix your glitch:

- Vulkan demopack: https://www.geeks3d.com/dl/show/50102

- demo: geexlab-demopack-vulkan/vk2/06-stress-test/vulkan-v2/

Tested with latest GeeXLab 0.37.0.

On a Coffee Lake GPU (core i7 8700K, UHD 630), I see no corruption (same thing for the tessellation demo). Looks like the driver for Ice Lake architecture handles Vulkan differently than Coffee Lake arch.