[Webkit-unassigned] [Bug 222790] New: WebGL2: Red flickering when using copyTexImage2D()

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=222790

            Bug ID: 222790
           Summary: WebGL2: Red flickering when using copyTexImage2D()
           Product: WebKit
           Version: Safari Technology Preview
          Hardware: Unspecified
                OS: Unspecified
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: WebGL
          Assignee: webkit-unassigned at lists.webkit.org
          Reporter: michael.herzog at human-interactive.org
                CC: dino at apple.com, kbr at google.com

I've enabled WebGL 2 in Safari Technology Preview Release 121 (Safari 14.2, WebKit 15612.1.4.3) on macOS 10.15.7.

Please open https://threejs.org/examples/#webgl_framebuffer_texture

The demo renders a scene and then copies a portion of the framebuffer into a texture (via copyTexImage2D()). This texture is then used for a sprite which is rendered at the top-left corner of the screen with an additional render pass.

When you now hover with the mouse over the links in the left menu bar, the sprite starts to flicker red.

This does not happen when using WebGL1 and not with latest Firefox and Chrome.

When using stable Safari (Version 14.0 15610.1.28.1.9, 15610) and WebGL 2, there is only a signle red flicker right when loading the page (but not when hovering links).

My system:

iMac (Retina 5K, 27'', ultimo 2014)
4 GHz Quad-Core Intel Core i7
16 GB 1600 MHz DDR3
AMD Radeon R9 M295X 4 GB

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