[Webkit-unassigned] [Bug 227585] For large WebGL contexts, WebGL is spending a lot of time in allocating new Metal textures for default frame buffer backing store

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=227585

--- Comment #3 from Kimmo Kinnunen <kkinnunen at apple.com> ---
Sample Count, Samples %, Normalized CPU %, Symbol
1367, 8.7%, 1.8%, WebCore::Document::prepareCanvasesForDisplayIfNeeded() (in WebCore)
1234, 7.8%, 1.6%,     WebCore::GraphicsContextGLOpenGL::prepareForDisplay() (in WebCore)
1100, 7.0%, 1.4%,         WebCore::GraphicsContextGLOpenGL::allocateAndBindDisplayBufferBacking() (in WebCore)
1100, 7.0%, 1.4%,             EGL_BindTexImage (in libANGLE-shared.dylib)
1100, 7.0%, 1.4%,                 egl::Surface::bindTexImage(gl::Context*, gl::Texture*, int) (in libANGLE-shared.dylib)
1063, 6.7%, 1.4%,                     rx::IOSurfaceSurfaceMtl::bindTexImage(gl::Context const*, gl::Texture*, int) (in libANGLE-shared.dylib)
1054, 6.7%, 1.4%,                         rx::IOSurfaceSurfaceMtl::ensureColorTextureCreated(gl::Context const*) (in libANGLE-shared.dylib)
1004, 6.4%, 1.3%,                             -[MTL..AccelDevice newTextureWithDescriptor:iosurface:plane:] (in ....)

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