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| layout: post | ||
| title: Psychtoolbox updated | ||
| categories: news | ||
| author: kleinerm | ||
| --- | ||
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| Psychtoolbox 3.0.19 update "Last free lunch" was released at 3rd November 2024. | ||
| The complete development history can be found in our GitHub repository. | ||
| The release tag is “3.0.19.15”, with the full tree and commit logs under the URL: | ||
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| <https://github.com/Psychtoolbox-3/Psychtoolbox-3/tree/3.0.19.15> | ||
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| ### Compatibility changes wrt. Psychtoolbox 3.0.19.14: | ||
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| - None. | ||
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| ### Highlights: | ||
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| - None. Only bug fixes for various 3rd party components, and small improvements. | ||
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| ### All: | ||
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| - Change enumeration order of video capture devices. This should avoid | ||
| selection of suboptimal capture devices by preferring more optimal ones, | ||
| especially on modern Ubuntu 22.04-LTS and later Linux distributions, which | ||
| often choose the new but immature pipewiresrc as video source plugin for a | ||
| camera instead of the old and proven/mature more optimal v4l2src as video | ||
| source. Specifically we hope to avoid VideoRecordingDemo.m problems like | ||
| the ones encountered in the following thread: | ||
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| https://psychtoolbox.discourse.group/t/codecs-in-videorecordingdemo-not-working-on-linux/5441 | ||
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| - PsychImaging: Fix HDR mode with types of PsychColorCorrection() that involve | ||
| lookup tables and only use one color correction operation in total. E.g, | ||
| standard LUT based correction, 3D LUT based correction or application of | ||
| per-pixel gain matrices. See: | ||
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| https://psychtoolbox.discourse.group/t/best-approach-for-gamma-correction-in-hdr10/5515 | ||
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| - CI release scripts: Disable building of .mltbx files for releases for now. | ||
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| The current approach contributed by Mathworks team is broken. It includes the | ||
| whole Psychtoolbox-3 tree for some utterly unclear reason, although the project | ||
| file only specified the Psychtoolbox/ subfolder. Worse, it adds toolbox folders | ||
| to the Matlab path in randomized (!?!) order, so our carefully selected ordering | ||
| of MatlabWindowsFilesR2007a/ folder wrt. PsychBasic folder gets screwed up and mex | ||
| files can't be found on MS-Windows anymore. Even worse, if SetupPsychtoolbox() fixes | ||
| it, then the Matlab Add-On Manager undos the fix every single time Matlab restarts! | ||
| This leads to issues like the following linked one: | ||
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| https://psychtoolbox.discourse.group/t/problem-with-screen-function-ptb-just-installed/5451/9 | ||
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| Apart from that, the Add On manager doesn't allow toolbox updates, and doesn't | ||
| set things like the Matlab Java path, doesn't deal with GStreamer etc. It has | ||
| zero benefit for our users, but is a source of hazarads and extra support overhead. | ||
| Drop it. | ||
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| - Add Psychtoolbox/PsychBasic/PsychPlugins/ to the search path for dynamic shared | ||
| libraries for all operating systems, so PTB specific plugin libraries can be found | ||
| during mex file load time. | ||
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| ### Linux: | ||
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| - Psychtoolbox was built and tested against Matlab R2024a and Octave 5.2 and later. | ||
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| - PsychImaging: Update 'EnableNative16BitFramebuffer' help text for year 2024. | ||
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| - Screen: Fix Vulkan display backend support with Mesa versions 23.3 and later | ||
| and thereby for Ubuntu 24.04-LTS and later. The same problem that affected the | ||
| Broadcom VideoCore 6 of the RaspberryPi 4 and later under Mesa 23.3 now affects | ||
| at least Intel and AMD under Mesa 24.0 with Ubuntu 24.04.0-LTS. | ||
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| It appears a slightly broken GL_EXT_direct_state_access implementation | ||
| in Mesa was introduced in Mesa 23.3 and later. Work around this in an effective | ||
| and safe way. | ||
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| - PsychVulkan: Add workaround against an AMDVLK bug that causes crash if the used | ||
| Vulkan display monitor has more than 64 video modes. A proper fix, especially | ||
| for multi-display setups, can only be done in a future AMDVLK driver from AMD's | ||
| Vulkan team, but for single display stimulation this workaround should prevent | ||
| crashes and problems, and on some multi-display setups things may still work | ||
| with a sprinkle of dumb luck - no guarantees for multi-display though! | ||
| Note that the AMDVLK driver is only used on AMD gpu's if a color depth of more | ||
| than standard 8 bpc (aka "deep color") or HDR-10 display mode is requested. For | ||
| other Vulkan use cases, the high quality Mesa radv Vulkan driver is used, which | ||
| does not suffer such a problem. For context see: | ||
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| https://psychtoolbox.discourse.group/t/vulkan-breaks-with-stack-smashing-detected-terminated/5501 | ||
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| - XOrgConfCreator: Adapt to Ubuntu 24.04-LTS changes in /dev/dri/card enumeration. | ||
| This broke hybrid graphics laptop detection, at least on three single gpu | ||
| laptops with AMD gpu's. It reported a dual-gpu config when there was not any. | ||
| Since Ubuntu 24.04-LTS, or more likely with a recent Linux 6.8 kernel shipping | ||
| in both Ubuntu 24.04-LTS and in Ubuntu 22.04.5-LTS with HWE stack, the first | ||
| (and only) gpu on a single gpu machine now has a /dev/dri/card1 device file, | ||
| instead of a /dev/dri/card0 device file, ie. device file indexing now starts | ||
| at 1 instead of 0. On multi-gpu machines, the second gpu is now associated | ||
| with /dev/dri/card2 and so on. This broke some hard-coded assumptions about | ||
| 0-based device numbering. We now use a more robust detection logic for hybrid | ||
| gpu detection. The fix was successfully tested on single-gpu AMD and Intel | ||
| graphics machines, and on a dual-gpu Intel + AMD laptop for each gpu and in | ||
| prime render offload mode. | ||
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| - Add braces for NetWM reporting to make compiler happier. It caused a weird | ||
| problem in the Screen mex build for Matlab, in which the "PTB-INFO: ..." lines | ||
| about the used flip timestamping mechanism are not printed! No clue why, looks | ||
| like some compiler bug, but adding the - technically not needed - braces fixes | ||
| it. | ||
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| ### Windows: | ||
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| - Psychtoolbox was built and lightly tested against Matlab R2024a and Octave 7.3. | ||
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| - VideoRecordingDemo.m: Remove special case MS-Windows path. It does not seem to | ||
| be as necessary anymore with the future default MediaFoundation path for capture | ||
| and recording. Also added some cleanups and ability to specify video capture | ||
| device as argument. | ||
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| ### macOS: | ||
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| - Psychtoolbox was built and tested against Matlab R2024a and against Octave 9.2 | ||
| from HomeBrew. | ||
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| Enjoy! |