[Webkit-unassigned] [Bug 198683] New: Work around the performance cost of creating bind groups

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=198683

            Bug ID: 198683
           Summary: Work around the performance cost of creating bind
                    groups
           Product: WebKit
           Version: WebKit Nightly Build
          Hardware: Unspecified
                OS: Unspecified
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: WebGPU
          Assignee: webkit-unassigned at lists.webkit.org
          Reporter: mmaxfield at apple.com

We model bind groups as argument buffers, which turn out to be regular MTLBuffers in Metal. On some drivers, creating a MTLBuffer can take a huge amount of time (https://github.com/gpuweb/gpuweb/issues/116#issuecomment-449245367).

Instead, we should try to make one big buffer, and use segments of the same buffer for many bind groups (using the "offset" parameter of -[MTLArgumentEncoder setArgumentBuffer:offset] https://developer.apple.com/documentation/metal/mtlargumentencoder/2915777-setargumentbuffer?language=objc

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