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Incorrect viewport size after window resizing on macOS with HDPIMode.Logical

See original GitHub issue

Seems to be caused by commit a5286e70f1ee279859ee8e8cc798b8444d458aaf , specifically where: gl20.glViewport(0, 0, width, height); was replaced with gl20.glViewport(0, 0, getWidth(), getHeight());

This results in the viewport size being set to logical pixels and not true pixels, which results in incorrect dimensions if display scaling is not 1. Some gl operations (viewport, scissor, etc) require true pixels in all cases.

I can reproduce this on my M1 mac (display scale of 2), the viewport renders in the bottom-left quadrant of the window. As a temporary workaround I can call Gdx.gl.glViewport(0, 0, Gdx.graphics.getBackBufferWidth(), Gdx.graphics.getBackBufferHeight()); in my application’s resize method.

Please select the affected platforms

Android
iOS
HTML/GWT
Windows
Linux
macOS

Issue Analytics

State:
Created a year ago
Comments:10 (10 by maintainers)

Top GitHub Comments

1reaction

00-Evancommented, Jun 6, 2022

I’ve tested this on my windows machine and Ubuntu VM now, seems to only affect macOS.

I believe for this issue at least there is no reason to revert all of the changes in a5286e70f1ee279859ee8e8cc798b8444d458aaf. Just changing that one line back (which was presumably done not knowing that there was a functional difference) should correct the issue.

0reactions

00-Evancommented, Jun 19, 2022

Just tested with 1.11.1-SNAPSHOT and the issue seems to be resolved, thanks.