[Webkit-unassigned] [Bug 280386] New: [GTK] Blank webview when running on LLVMpipe: Failed to create DMA-BUF texture of size 1024x693: Unsupported dmabuf format: XR24:0xffffffffffffff

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=280386

            Bug ID: 280386
           Summary: [GTK] Blank webview when running on LLVMpipe: Failed
                    to create DMA-BUF texture of size 1024x693:
                    Unsupported dmabuf format: XR24:0xffffffffffffff
           Product: WebKit
           Version: WebKit Nightly Build
          Hardware: PC
                OS: Linux
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: WebKitGTK
          Assignee: webkit-unassigned at lists.webkit.org
          Reporter: nekohayo at gmail.com
                CC: bugs-noreply at webkitgtk.org

Created attachment 472685

  --> https://bugs.webkit.org/attachment.cgi?id=472685&action=review

MiniBrowser output when running with software rendering via LLVMpipe

With minibrowser 2.45.91, as well as Epiphany 47 (and previously 46) from the Fedora 41 repositories, when testing with an old Dell Inspiron machine that apparently runs everything on LLVMpipe (according to the GTK Inspector's vulkan renderer info, and the fact that GSK renderer = Cairo), any page I try to load (including internal pages like about:gpu) renders blank, even though you can interact with it.

This is a bit similar to bug #272980 but the frequent error code here is different, XR24 instead of AR24... it looks roughly like this:

(MiniBrowser:5353): Gsk-WARNING **: 21:49:21.950: Linking failure in shader:
error: Exceeded max TGSI temps (38/16)

(MiniBrowser:5353): Gsk-WARNING **: 21:49:22.226: Linking failure in shader:
error: Exceeded max TGSI temps (38/16)

(MiniBrowser:5353): Gdk-WARNING **: 21:49:22.227: Failed to realize GL renderer: Linking failure in shader: error: Exceeded max TGSI temps (38/16)
Failed to create DMA-BUF texture of size 1024x693: Unsupported dmabuf format: XR24:0xffffffffffffff
Failed to create DMA-BUF texture of size 1024x693: Unsupported dmabuf format: XR24:0xffffffffffffff
Failed to create DMA-BUF texture of size 1024x693: Unsupported dmabuf format: XR24:0xffffffffffffff
Failed to create DMA-BUF texture of size 1024x693: Unsupported dmabuf format: XR24:0xffffffffffffff


I am attaching the more detailed log output.

Unlike bug #277684 which seems to have a random occurrence aspect to it, the bug here is happening 100% of the time on that computer that seems to be running LLVMpipe.

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