Excessive screen tearing about borderlessmining HOT 11 OPEN

Sorry, I've been rather busy the past few months! I'll let you know when I've got something you can test. I've created #19 to keep everything relating to the changes I'm working on in one place.

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This doesn't seem to occur when there is no external display connected.

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I have the same problem on integrated AMD graphics (Ryzen 3 3200G with Vega 8) running at 1440p. Can share my machine for testing if needed. Maybe Vsync doesn't work?

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Went and bought a proper card... also happens on a Radeon RX 570.

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Update: tearing still happens with Radeon Enhanced Sync and/or OpenGL Triple Buffering. Also, another datapoint: I'm running Optifine 1.15.2 pre21.

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I'm experiencing screen tearing on an GTX 980Ti with V-Sync on. I'm using Optifine 1.16.1 pre2 on fabric. Please help.

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Does this still happen without Optifine?

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This seems to be related to GLFW calling DwmFlush() in windowed mode - I'm testing new methods of creating a borderless fullscreen window, which seem to fix the issue.

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Is there a test build?

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Not yet, I'm going to add a comment here when there is one.

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Did you ever figure this out?

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