Metal (API)

Metal is a low-level, low-overhead hardware-accelerated graphics and compute application programming interface (API) that debuted in iOS 8. It combines functionality similar to OpenGL and OpenCL under one API. It is intended to bring to iOS some of the performance benefits of similar APIs on other platforms, such as Khronos Group's cross-platform Vulkan and Microsoft's Direct3D 12 for Windows. Since June 8, 2015, Metal is available for iOS devices using the Apple A7 or later, as well as Macs (2012 models or later) running OS X El Capitan. Metal also further improves the capabilities of GPGPU programming by introducing compute shaders.

Metal uses a new shading language based on C++11; this is implemented using Clang and LLVM.

Support for Metal on OS X was announced at WWDC 2015.

Performance

Metal should have better performance than OpenGL, for several reasons:

Application programming interface

In computer programming, an application programming interface (API) is a set of routines, protocols, and tools for building software and applications.

An API expresses a software component in terms of its operations, inputs, outputs, and underlying types, defining functionalities that are independent of their respective implementations, which allows definitions and implementations to vary without compromising the interface. A good API makes it easier to develop a program by providing all the building blocks, which are then put together by the programmer.

An API may be for a web-based system, operating system, or database system, and it provides facilities to develop applications for that system using a given programming language. As an example, a programmer who develops apps for Android may use an Android API to interact with hardware, like the front camera of an Android-based device.

In addition to accessing databases or computer hardware like hard disk drives or video cards, an API can ease the work of programming GUI components. For example, an API can facilitate integration of new features into existing applications (a so-called "plug-in API"). An API can also assist otherwise distinct applications with sharing data, which can help to integrate and enhance the functionalities of the applications.

API gravity

The American Petroleum Institute gravity, or API gravity, is a measure of how heavy or light a petroleum liquid is compared to water: if its API gravity is greater than 10, it is lighter and floats on water; if less than 10, it is heavier and sinks.

API gravity is thus an inverse measure of a petroleum liquid's density relative to that of water (also known as specific gravity). It is used to compare densities of petroleum liquids. For example, if one petroleum liquid is less dense than another, it has a greater API gravity. Although mathematically, API gravity is a dimensionless quantity, see the formula below, it is referred to as being in 'degrees'. API gravity is gradated in degrees on a hydrometer instrument. API gravity values of most petroleum liquids fall between 10 and 70 degrees.

History of development

In 1916, the U.S. National Bureau of Standards accepted the Baumé scale, which had been developed in France in 1768, as the U.S. standard for measuring the specific gravity of liquids less dense than water. Investigation by the U.S. National Academy of Sciences found major errors in salinity and temperature controls that had caused serious variations in published values. Hydrometers in the U.S. had been manufactured and distributed widely with a modulus of 141.5 instead of the Baumé scale modulus of 140. The scale was so firmly established that, by 1921, the remedy implemented by the American Petroleum Institute was to create the API gravity scale, recognizing the scale that was actually being used.

6-(2-Aminopropyl)indole

6-(2-Aminopropyl)indole (6-API, 6-IT) is an indole derivative with no history of use in humans. The analogue 5-API is known to be psychoactive, indicating 6-API may also be psychoactive by the same structure-activity relationship that links 5-APB and 6-APB.

Alexander Shulgin says in his book TiHKAL "From the normal 3-position to the 2, the 4, the 5, the 6 or the 7-positions. All five alpha-methyltryptamine isomers are known, but only one is known to be active in man as a CNS active material. This is the 5-isomer, 5-(2-aminopropyl)indole or 5-IT".

Studies in dogs have also shown the drug to increase hemoglobin levels in the bloodstream.

Legality

Metal: A Headbanger's Journey

Metal: A Headbanger's Journey is a 2005 documentary directed by Sam Dunn with Scot McFadyen and Jessica Wise. The film follows 31-year-old Dunn, a Canadian anthropologist, who has been a heavy metal fan since the age of 12. Dunn sets out across the world to uncover the various opinions on heavy metal music, including its origins, culture, controversy, and the reasons it is loved by so many people. The film made its debut at the 2005 Toronto International Film Festival, and was released as a two-disc special edition DVD in the US on September 19, 2006.

A follow-up to the film titled Global Metal premiered at the Bergen International Film Festival on October 17, 2007, and saw limited release in theatres in June 2008. Dunn has also elaborated upon his "Heavy Metal Family Tree" in the VH1 series Metal Evolution, which focuses on one subgenre per episode.

Contents

The film discusses the traits and originators of some of metal's many subgenres, including the New Wave of British Heavy Metal, power metal, nu metal, glam metal, thrash metal, black metal, and death metal. Dunn uses a family-tree-type flowchart to document some of the most popular metal subgenres. The film also explores various aspects of heavy metal culture. Notable segments include Dunn taking a trip to the Wacken Open Air festival, an interview with Dee Snider providing an analysis of the PMRC attack on heavy metal music, and an interview with several Norwegian black metal bands.

Metal (Wu Xing)

Metal (Chinese: 金; pinyin: jīn), the fourth phase of the Chinese philosophy of Wu Xing, is the decline of the matter, or the matter's decline stage. Metal is yin in character, its motion is inwards and its energy is contracting. It is associated with the autumn, the west, old age, the planet Venus, the color white, dry weather, and the White Tiger (Bai Hu) in Four Symbols. The archetypal metals are silver and gold.

Attributes

In Chinese Taoist thought, Metal attributes are considered to be firmness, rigidity, persistence, strength, and determination. The metal person is controlling, ambitious, forceful, and set in their ways as metal is very strong. They are self-reliant and prefer to handle their problems alone. The metal person is also wise, business-oriented, and good at organization and stability. However, the metal person can also appreciate luxury and enjoy the good things in life. Just as metal can conduct electricity, the metal person has strong impulses and generative powers and can bring about changes and transformations for those who come into contact with them. The metal person is patient, as well as a good person with a strong will.

Metal (Manilla Road album)

Metal is an album released by heavy metal band Manilla Road in 1982.

Track listing

Credits

References