Vulkan Flickering in Intel GPU

[Joilnen]

compiled in intel arch linux, ogre commit 3f0a656
see the video from screen capture

output1.mp4

[paroj]

try setting this to 1

ogre/RenderSystems/Vulkan/src/OgreVulkanRenderSystem.cpp

Line 55 in 3f0a656

#define USE_VALIDATION_LAYERS 0

there should be some output of what is going wrong

[Joilnen]

I got this with that set on 1, running the same sample in the video

Texture 'sdk_button_over.png': Loading 1 faces(PF_A8B8G8R8,128x32x1) with 7 generated mipmaps from Image. Internal format is PF_A8B8G8R8,128x32x1.
Texture 'sdk_button_down.png': Loading 1 faces(PF_A8B8G8R8,128x32x1) with 7 generated mipmaps from Image. Internal format is PF_A8B8G8R8,128x32x1.
Texture 'rockwall.tga': Loading 1 faces(PF_B8G8R8,256x256x1) with 8 generated mipmaps from Image. Internal format is PF_X8B8G8R8,256x256x1.
Mesh: Loading Sinbad.mesh.
Skeleton: Loading Sinbad.skeleton
Texture 'sinbad_body.tga': Loading 1 faces(PF_B8G8R8,512x512x1) with 9 generated mipmaps from Image. Internal format is PF_X8B8G8R8,512x512x1.
Texture 'sinbad_clothes.tga': Loading 1 faces(PF_B8G8R8,512x512x1) with 9 generated mipmaps from Image. Internal format is PF_X8B8G8R8,512x512x1.
Texture 'sinbad_sword.tga': Loading 1 faces(PF_B8G8R8,256x256x1) with 8 generated mipmaps from Image. Internal format is PF_X8B8G8R8,256x256x1.
Warning: the mesh 'Sinbad.mesh' includes vertices with more than 4 bone assignments. The lowest weighted assignments beyond this limit have been removed, so your animation may look slightly different. To eliminate this, reduce the number of bone assignments per vertex on your mesh to 4.
Creating swords
Mesh: Loading Sword.mesh.
Creating the chains
Texture 'ribbonband.png': Loading 1 faces(PF_B8G8R8,128x1x1) with 7 generated mipmaps from Image. Internal format is PF_X8B8G8R8,128x1x1.
ERROR: [Validation] Code 0 : Validation Error: [ VUID-VkSubpassDependency-dstAccessMask-00869 ] | MessageID = 0x8ab30c42 | vkCreateRenderPass(): pDependencies[0].dstAccessMask bit VK_ACCESS_DEPTH_STENCIL_ATTACHMENT_WRITE_BIT is not supported by stage mask (VK_PIPELINE_STAGE_COLOR_ATTACHMENT_OUTPUT_BIT). The Vulkan spec states: Any access flag included in dstAccessMask must be supported by one of the pipeline stages in dstStageMask, as specified in the table of supported access types (https://www.khronos.org/registry/vulkan/specs/1.3-extensions/html/vkspec.html#VUID-VkSubpassDependency-dstAccessMask-00869)
ERROR: [Validation] Code 0 : Validation Error: [ VUID-VkSubpassDependency-srcAccessMask-00868 ] | MessageID = 0x2ef6351e | vkCreateRenderPass(): pDependencies[1].srcAccessMask bit VK_ACCESS_DEPTH_STENCIL_ATTACHMENT_WRITE_BIT is not supported by stage mask (VK_PIPELINE_STAGE_COLOR_ATTACHMENT_OUTPUT_BIT). The Vulkan spec states: Any access flag included in srcAccessMask must be supported by one of the pipeline stages in srcStageMask, as specified in the table of supported access types (https://www.khronos.org/registry/vulkan/specs/1.3-extensions/html/vkspec.html#VUID-VkSubpassDependency-srcAccessMask-00868)
PERFORMANCE WARNING: [Validation] Code 0 : Validation Performance Warning: [ UNASSIGNED-CoreValidation-Shader-OutputNotConsumed ] Object 0: handle = 0x19a1f80000001478, type = VK_OBJECT_TYPE_SHADER_MODULE; | MessageID = 0x609a13b | vkCreateGraphicsPipelines(): pCreateInfos[0] Vertex attribute at location 8 not consumed by vertex shader
PERFORMANCE WARNING: [Validation] Code 0 : Validation Performance Warning: [ UNASSIGNED-CoreValidation-Shader-OutputNotConsumed ] Object 0: handle = 0x19a1f80000001478, type = VK_OBJECT_TYPE_SHADER_MODULE; | MessageID = 0x609a13b | vkCreateGraphicsPipelines(): pCreateInfos[0] Vertex attribute at location 8 not consumed by vertex shader

[paroj]

the error seem to be unrelated to the visual artifact. My guess would be that this is something with how we do HBL_DISCARD on Vulkan.

However all works for me with Mesa/ amdgpu. What Mesa version are you using?

[paroj]

to further help debug this, you could try getting a https://renderdoc.org/ capture of a broken frame.

[Joilnen]

mesa 1:23.1
will try renderdoc and report here

[Joilnen]

Screen captures made in renderdoc
caps.zip

[paroj]

will have to reproduce this locally at some point, I guess..

[paroj]

I have just updated the ogre snap https://snapcraft.io/ogre such that it works with mesa vulkan drivers. could you check whether it produces the same errors for you?