With the release of Apple's macOS Catalina, every creative professional will need to decide if updating is right for them. More often than not, the initial jump to a new OS will do very little, if anything, to benefit the creative artist. Changes to the OS and improvements in technology are more likely to have a negative effect on your software, hardware, and workflow; at least at first.
To enable the extension and allow the driver, navigate to System Preferences > Security & Privacy. Restart the computer first if this is necessary to complete the driver installation. Under the General tab, look for the "System software from developer "(driver developer)" was blocked from loading."
Hardware acceleration is based on an OpenGL context. Usually, this means it isprocessed by video hardware. However, software-based OpenGL implementationsexist which means there is no guarantee for hardware processing. It depends onthe respective OSX.
Otherwise, a device must be provided. Create new hardware surfaces on thatdevice for the output, then map them back to the software format at the inputand give those frames to the preceding filter. This will then act like thehwupload filter, but may be able to avoid an additional copy whenthe input is already in a compatible format.
GNU Guix1 is a packagemanagement tool for and distribution of the GNU system.Guix makes it easy for unprivilegedusers to install, upgrade, or remove software packages, to roll back to aprevious package set, to build packages from source, and generallyassists with the creation and maintenance of software environments.
Guix provides a command-line package management interface(see Package Management), tools to help with software development(see Development), command-line utilities for more advanced usage(see Utilities), as well as Scheme programming interfaces(see Programming Interface).Its build daemon is responsible for building packages on behalf ofusers (see Setting Up the Daemon) and for downloading pre-builtbinaries from authorized sources (see Substitutes).
Guix comes with a distribution of the GNU system consisting entirely offree software3. Thedistribution can be installed on its own (see System Installation),but it is also possible to install Guix as a package manager on top ofan installed GNU/Linux system (see Installation). When we need todistinguish between the two, we refer to the standalone distribution asGuix System.
Our goal is to provide a practical 100% free software distribution ofLinux-based and other variants of GNU, with a focus on the promotion andtight integration of GNU components, and an emphasis on programs andtools that help users exert that freedom.
Note: We recommend the use of thisshell installer script to install Guix on top of a running GNU/Linux system,thereafter called a foreign distro.4 The script automates thedownload, installation, and initial configuration of Guix. It should be runas the root user.
If you prefer to perform the installation steps manually or want to tweakthem, you may find the following subsections useful. They describe thesoftware requirements of Guix, as well as how to install it manually and getready to use it.
Note: We recommend the use of thisshell installer script. The script automates the download, installation, andinitial configuration steps described below. It should be run as the rootuser. As root, you can thus run this:
This section lists requirements when building Guix from source. Thebuild procedure for Guix is the same as for other GNU software, and isnot covered here. Please see the files README and INSTALLin the Guix source tree for additional details.
The daemon also honors the http_proxy and https_proxyenvironment variables for HTTP and HTTPS downloads it performs, be itfor fixed-output derivations (see Derivations) or for substitutes(see Substitutes).
In this way, setting --gc-keep-derivations to yes causesliveness to flow from outputs to derivations, and setting--gc-keep-outputs to yes causes liveness to flow fromderivations to outputs. When both are set to yes, the effect isto keep all the build prerequisites (the sources, compiler, libraries,and other build-time tools) of live objects in the store, regardless ofwhether these prerequisites are reachable from a GC root. This isconvenient for developers since it saves rebuilds or downloads.
This makes /gnu/store copy-on-write, such that packages added to itduring the installation phase are written to the target disk on /mntrather than kept in memory. This is necessary because the first phase ofthe guix system init command (see below) entails downloads orbuilds to /gnu/store which, initially, is an in-memory file system.
This copies all the necessary files and installs GRUB on/dev/sdX, unless you pass the --no-bootloader option. Formore information, see Invoking guix system. This command may triggerdownloads or builds of missing packages, which can take some time.
As you run this command, you will see that binaries are downloaded (orperhaps some packages are built), and eventually you end up with theupgraded packages. Should one of these upgraded packages not be to yourliking, remember you can always roll back!
The purpose of GNU Guix is to allow users to easily install, upgrade, andremove software packages, without having to know about their buildprocedures or dependencies. Guix also goes beyond this obvious set offeatures.
To allow Guix to download substitutes from ci.guix.gnu.org, bordeaux.guix.gnu.org or a mirror, youmust add the relevant public key to the access control list (ACL) of archiveimports, using the guix archive command (see Invoking guix archive). Doing so implies that you trust the substitute server to notbe compromised and to serve genuine substitutes.
There is one exception though: if an unauthorized server providessubstitutes that are bit-for-bit identical to those provided byan authorized server, then the unauthorized server becomes eligible fordownloads. For example, assume we have chosen two substitute serverswith this option:
Substitutes are downloaded over HTTP or HTTPS. The http_proxy andhttps_proxy environment variables can be set in the environment ofguix-daemon and are honored for downloads of substitutes.Note that the value of those environment variables in the environmentwhere guix build, guix package, and other clientcommands are run has absolutely no effect.
Packages are installed or upgraded to the latest version available inthe distribution currently available on your local machine. To updatethat distribution, along with the Guix tools, you must run guixpull: the command downloads the latest Guix source code and packagedescriptions, and deploys it. Source code is downloaded from aGit repository, by default the officialGNU Guix repository, though this can be customized. guixpull ensures that the code it downloads is authentic byverifying that commits are signed by Guix developers.
By default, guix pull authenticates code downloaded fromchannels by verifying that its commits are signed by authorizeddevelopers, and raises an error if this is not the case. This optioninstructs it to not perform any such verification.
Note: The history of Guix is immutable and guix time-machineprovides the exact same software as they are in a specific Guixrevision. Naturally, no security fixes are provided for old versionsof Guix or its channels. A careless use of guix time-machineopens the door to security vulnerabilities. See --allow-downgrades.
Guix and its package collection are updated by running guix pull(see Invoking guix pull). By default guix pull downloads anddeploys Guix itself from the official GNU Guix repository. This can becustomized by defining channels in the~/.config/guix/channels.scm file. A channel specifies a URL and branchof a Git repository to be deployed, and guix pull can be instructedto pull from one or more channels. In other words, channels can be usedto customize and to extend Guix, as we will see below.Guix is able to take into account security concerns and deal with authenticatedupdates.
The guix shell command provides a convenient way to set upone-off software environments, be it for development purposes or to runa command without installing it in your profile. The guixpack command allows you to create application bundles that can beeasily distributed to users who do not run Guix.
When this option is omitted, the environment is protected from garbagecollection only for the duration of the guix environmentsession. This means that next time you recreate the same environment,you could have to rebuild or re-download packages. See Invoking guix gc, for more on GC roots.
An object containing the URI of the source. The object type depends onthe method (see below). For example, when using theurl-fetch method of (guix download), the valid urivalues are: a URL represented as a string, or a list thereof.
Return a fixed-output derivation that fetches data from url (astring, or a list of strings denoting alternate URLs), which is expectedto have hash hash of type hash-algo (a symbol). By default,the file name is the base name of URL; optionally, name canspecify a different file name. When executable? is true, make thedownloaded file executable.
Likewise, the (guix git-download) module defines thegit-fetch origin method, which fetches data from a Git versioncontrol repository, and the git-reference data type to describethe repository and revision to fetch.
Other objects are defined to support otherconventions and tools used by free software packages. They inherit mostof gnu-build-system, and differ mainly in the set of inputsimplicitly added to the build process, and in the list of phasesexecuted. Some of these build systems are listed below.
This variable is exported by (guix build-system maven). It implementsa build procedure for Maven packages. Mavenis a dependency and lifecycle management tool for Java. A user of Mavenspecifies dependencies and plugins in a pom.xml file that Maven reads.When Maven does not have one of the dependencies or plugins in its repository,it will download them and use them to build the package. 2b1af7f3a8