# Psychtoolbox 3.0.19.4 release “Virtuality!” SP4 released **URL:** \ **Category:** Announcements\ **Tags:** release\ **Created:** [October 27, 2023, 5:57pm UTC](https://psychtoolbox.discourse.group/t/psychtoolbox-3-0-19-4-release-virtuality-sp4-released/5148 "2023-10-27T17:57:33Z")\ **Posts on this page:** 1\ **Page:** 1
**Author:** ![mariokleiner](https://avatars.discourse-cdn.com/v4/letter/m/13edae/32.png) [@mariokleiner](https://psychtoolbox.discourse.group/u/mariokleiner)\ **Post date:** [October 27, 2023, 5:57pm UTC](https://psychtoolbox.discourse.group/t/psychtoolbox-3-0-19-4-release-virtuality-sp4-released/5148/1 "2023-10-27T17:57:33Z")
Psychtoolbox 3.0.19 Beta update “Virtuality” SP4 was released at 27th October 2023. As usual, the complete development history can be found in our GitHub repository. The release tag is “3.0.19.4”, with the full tree and commit logs under the URL: [https://github.com/Psychtoolbox-3/Psychtoolbox-3/tree/3.0.19.4](https://github.com/Psychtoolbox-3/Psychtoolbox-3/tree/3.0.19.4) This Psychtoolbox release was partially sponsored by [Mathworks under the year 2023/2024 contract.](https://www.mathworks.com/solutions/neuroscience.html) ### Compatibility changes wrt. Psychtoolbox 3.0.19.3: - On MS-Windows, GStreamer 1.22 is now required, the latest lightly tested version is GStreamer 1.22.5. With the older GStreamer 1.20, text rendering with the high quality drawtext plugin will no longer work, and the fallback GDI text renderer would be used, which is officially unsupported in case of trouble and has lower performance/quality/features/reliability. - On macOS if using Octave, Octave 8.3 is now recommended and tested, but older Octave versions back to v6.3 are expected (but not tested) to continue to work. ### Highlights: None, just a large grab bag of various minor and major fixes and improvements. ### All: - Some Unix file permission cleanup contributed by Yaroslav from NeuroDebian. - CalibrateMonSpd(): Fix some fallout from previous fixes. Set cal.describe.dacsize also if g\_usebitspp is already set. Reference: [https://github.com/kleinerm/Psychtoolbox-3/issues/252](https://github.com/kleinerm/Psychtoolbox-3/issues/252) - DegreesToRetinalEccentricityMM(): Fix typo in code that prevented replacement of small angles by the linear approximation. Contributed by Stella Prins. - MakeSineImage(): Allow passing of center (0 phase) position of the sinusoid. Contributed by David Brainard. - ComputePhotopigmentBleaching(): Add constants from Wyszecki and Stiles. Contributed by David Brainard. - New touchscreen demo: MultiTouchPinchDemo.m, to show detection and handling of two finger pinch gestures on touchscreens. - Output info message with potential troubleshooting tips if drawtext init takes unusually long, hinting at potential fontconfig cache rebuild (problems) on MS-Windows. May or may not help anybody, but probably doesn’t hurt. Suggested by GitHub user @mirh. - DrawFormattedText(): Add new keyword ‘left’ to use for the ‘sx’ parameter. It will left-align drawn text to the left border of an optionally provided ‘winRect’, similar to the ‘right’ keyword for right-alignment. Improvement contributed by GitHub user @SVNKoch. - PsychPortAudio: Add potential workaround to deal with temperamental / weird audio sound cards. Add a new optional parameter to the tweaking command `PsychPortAudio('EngineTunables', ...., workarounds);`, which allows to specify a non-default (ie. non-zero) workarounds bitmask to selectively disable or enable workarounds. The currently defined workaround bits are the following, which modify how the Portaudio audio format test function Pa\_IsFormatSupported is handled: - Snd(): Switch fallback method from use of sound() to use of audioplayer(). Both modern Octave and Matlab implement sound() as a wrapper around their audioplayer() objects, so using audioplayer() directly gives us more control for a better Snd() fallback implementation. Also use the fallback method as new default by default. Iow. unless specified otherwise, Snd() will play via audioplayer(). This provides good interop with other audio clients and with Screen()'s GStreamer based movie playback engine. - Beeper(): Formatting/Indentation fixes, refine soundvector calculation. - BitsPlusIdentityClutTest: Disable encoder test if Vulkan display is used. Current design lead to the tests running before the Vulkan backend is fully in charge, so we display the PTB welcome screen or pixeltrash during the test, instead of the test stims, which leads to false-positive test failure. Just don’t offer the test option under Vulkan. DatapixxGPUDitherpatternTest is an alternative working way to test with Vulkan at the moment. - PsychOpenHMDVR: Use correct ipd/2 instead of ipd for warp-mesh setup in our OpenHMD driver. - Minor bug fixes, documentation updates and improvements. ### Linux: - Psychtoolbox was built and lightly tested against Matlab R2022b. - RPiGPIOMex: Various bug fixes and improvements. Also merged two alternative implementations of the file co-written by Steve Van Hooser and myself. These reimplement functionality by using the pigpio library instead of the old and deprecated wiringPi library. This should be more future-proof and maintainable. For now, the original file based on wiringPi is still used though, until we decide which of the two new variants is the better choice. - Fix exception handling on Octave for RaspberryPi on RaspberryPi OS, so errors only abort the users script and don’t terminate the whole Octave application. ### Windows: - Psychtoolbox was built and lightly tested against Matlab R2022b. - GStreamer 1.22 is now required, GStreamer 1.20 will have limitations. - Fix drawtext plugin again, so it no longer breaks under Matlab with GStreamer 1.22 on some systems. This will now require the installation of GStreamer 1.22, the older GStreamer 1.20 will no longer work with the drawtext plugin. - Windows: Remove support for building 32-Bit mex files. Matlab is 64-Bit only since a long time on Windows, Octave is about to remove 32-Bit support as well. Windows-10 - the last MS 32-Bit operating system is on the way to final retirement. Ergo, no need for 32-Bit builds in the future anymore. - Make Screen(‘Openwindow’) timing startup tests and calibrations more robust. This by disabling processor idling during the tests, ie. ACPI C-State processor power management transitions out of C0 (active). Such transitions can induce latency / variability in code execution timing bad enough to affect timing tests on some setups. If and how much this helps in practice remains to be seen. Based on investigations / measurements by GitHub user @mirh, see GitHub isse #793 for reference. If this new optimization causes trouble or interop problems with cpu performance tweaking tools, e.g., the Windows tools “throttlestop”, it can be disabled by use of the command before the first time you try to open an onscreen window in your experiment script: ### macOS: - Psychtoolbox was built and lightly tested against Matlab R2022b and Octave 8.3 from HomeBrew. - Screen(): Add iMac20,1 and iMac20,2 aka year 2020 iMacs to timing fixup lut, so the visual timing fixes also apply to these final Intel iMac models with AMD Navi graphics chips. As the PsychtoolboxKernelDriver does not support AMD Navi graphics, our visual timestamping and our diagnostic for visual timing problems on these machines will be more limited than on older machines, but the untested expectation is that this should fix timing on 2020 iMac internal displays. - Screen(): Remove conserveVRAM flag kPsychDontCacheTextures. It was useless and even buggy since years, so let it die. - Screen(): Add new conserveVRAM preference flag 2 == kPsychDontSwitchToOptimalVidMode. May or may not help fullscreen display on connected external video splitters like the Matrox DualHead2Go. This is based on a hunch, not on proper root causing. Cfe. [Open window can't set to a specified rect size on macOS With Matrox Dualhead2Go](https://psychtoolbox.discourse.group/t/open-window-cant-set-to-a-specified-rect-size-on-macos-with-matrox-dualhead2go/5061) Enjoy!