Revision History

In macOS App Sandbox settings, added read/write permission for user-selected files.

Runs on macOS as well as iOS and iPadOS.

Exports PNG images as Mail, Messages, AirDrop, Save to Files, Copy, etc

Updated for iOS 17+

Full Swift 6 Concurrency.

Entire app re-written in Swift and SwiftUI.

Added Polish translation, thanks to Marcin Pilarski.

Added Turkish translation, thanks to Süleyman Saltuk Güngör.

(legacy iOS) Changed iOS Deployment Target to iOS 14, because Apple has stopped supporting iOS 12. Thus, in particular, I no longer have a maintainable iOS 12 device to test on.

(legacy iOS) Added UINavigationBarAppearance so that navigation bars will have an opaque background when running on iOS 15.

(macOS) Runs natively on both Apple Silicon and Intel Macs.

Changed various GPU uniforms, colors in buffers, etc. to half-precision (__fp16 and faux_simd_half4) where appropriate.

Removed workaround for bug that function-constant assignments like
constant bool gFoo [[ function_constant(0) ]];
constant bool gBar = ! gFoo;
used to work as expected on iOS but fail on macOS. They now work correctly on both OS’s.

Added Portuguese translation, thanks to Nuno Fernandes

Renders Maze colors as fully-saturated Display P3, when available.

Renders to Wide Color (Display P3) when available.

Some of the shared code that won't be needed in the upcoming SwiftUI versions of the Geometry Games apps has been migrated to "-LEGACY" files, to allow the SwiftUI versions to include desired utilities without including legacy cruft like PixelRGBA, ImageRGBA, etc.

(iOS) Converted launch screen format from .xib to .storyboard to comply with new App Store requirements.

(iOS) Toolbar self-adjusts at runtime to default height for device (iPad or iPhone).

(iOS) Made toolbar opaque to make it brighter.

Replaced functions deprecated in iOS 13 or macOS 10.15 with non-deprecated alternatives.

(iOS) Updated for compatibility with iOS 13. In particular, it delays the presentation of the initial popover until after the base view controller has finished setting up.

(macOS) Enabled Hardened Runtime to allow Notarization by Apple.

(iOS) Added screenshots for iPad Pro (3rd Gen).

(iOS) Enabled Extra Hard mazes on iPhones, primarily for use on newer, larger phones.

(iOS) Table images, toolbar icons and other images re-created at @1x, @2x and @3x. Source files for those images all simplified and tidied up (now mostly as iDraw files).

(iOS) Toolbar icons resized to 24pt, which is the new recommended size.

(iOS) Now Metal-only. Removed all OpenGL ES code.

(macOS) On multi-GPU systems, selects the GPU that's already running the displays attached to the main computer (but ignores any externally attached removable GPUs). If the system switches to a different GPU, this app switches to that GPU as well.

(macOS) No longer calls [[NSNotificationCenter defaultCenter] removeObserver:self] because it's no longer necessary.

(macOS) Main content view is now layer-backed. When going fullscreen, avoids macOS 10.13.4 bug.

CPU code consistently uses "double" (rather than "float") for essentially everything.

(Mac) Completed Metal version for macOS.

(Mac) Mac version is now Metal-only. Reason: The Mac OpenGL version of the Geometry Games uses an older approach that would have been very time-consuming to rewrite using a CAOpenGLLayer to bring it into line with iOS OpenGL, iOS Metal and Mac Metal versions. It hardly seemed worth investing that much time into OpenGL code that would soon get phased out anyhow. In any case, users of older Macs will always be able to download an older, OpenGL-compatible version of each app.

(Mac) Given that the Mac version is now Metal-only, it now requires macOS 10.12 or later. Reason: macOS 10.12 is the only version I can test the apps on, and I prefer not to release an app for earlier versions of the operating system, on which it's never been tested.

Created a single project document with targets for iOS and macOS.

Created that single project document from scratch, to get rid of years of legacy cruft.

Retired the Android code.

(iOS) 4D Maze is now "device-assignable" for easy installation on school iPads via MDM.

(iOS) Rewrote graphics using Metal. Falls back to OpenGL ES on older devices (pre-A7).

Separated OpenGL(ES)-specific data and code from graphics-system-independent data and code, in preparation for a migration from OpenGL(ES) to Metal on iOS and Mac (and maybe eventually to Vulkan on Android and to DX12 on Windows).

(Android) Disabled COMPILE_ANDROID_FOR_GLES2, so app now requires OpenGL ES 3 on Android.

(iOS) Updated for iOS 8/9. Extensive internal changes.

(Mac) Updated code for Mac OS X 10.10, replacing all deprecated method calls. Requires OpenGL 3.3.

(iOS, Mac) Converted memory management from Manual Retain-Release (MRR) to Automatic Reference Counting (ARC).

Suppressed the Language menu to avoid displaying UniHan characters incorrectly (and also because the Language menu wasn't really useful except in the Torus Games).

(iOS) Updated to require iOS 6. Removed -viewDidUnload and -shouldAutorotateToInterfaceOrientation.

(iOS) Improved German Help file
(Mac, Win and Android versions already have it)

(Mac) Added 4D Shear slider

(Android) Added 4D Shear slider

Italian translation added, thanks to Daniela Bigatti

German translation added, thanks to Bernd Macheleidt and Sascha Gritzbach
(with some help from Frank Lutz and Sonja Meyr)

(iOS) Added 4D Shear slider

Russian translation added, thanks to Maria Trnkova

iOS version added

Android version added

Windows version added

Japanese translation added, thanks to Tatsu Takeuchi

Initial public release