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OpenGL Shading Language (GLSL) is a high-level shading language with a syntax based on the C programming language. It was created by the OpenGL ARB (OpenGL Architecture Review Board) to give developers more direct control of the graphics pipeline without having to use ARB assembly language or hardware-specific languages.
ANGLE, web browsers graphics engine, a cross-platform translator of OpenGL ES calls to DirectX, OpenGL, or Vulkan API calls. Direct3D (a subset of DirectX) Glide a defunct 3D graphics API developed by 3dfx Interactive. Mantle developed by AMD. Metal developed by Apple. OpenGL and the OpenGL Shading Language; OpenGL ES 3D API for embedded devices.
However, their proposal for a C-style shading language was eventually completed, resulting in the current formulation of the OpenGL Shading Language (GLSL or GLslang). Like the assembly-like shading languages it was replacing, it allowed replacing the fixed-function vertex and fragment pipe with shaders , though this time written in a C-like ...
Metal combines functions similar to OpenGL and OpenCL in one API. It is intended to improve performance by offering low-level access to the GPU hardware for apps on iOS, iPadOS, macOS, and tvOS. It can be compared to low-level APIs on other platforms such as Vulkan and DirectX 12.
It was the first major revision to OpenGL since the creation of OpenGL 1.0 in 1992. Some benefits of using GLSL are: Cross-platform compatibility on multiple operating systems, including Linux, macOS and Windows. The ability to write shaders that can be used on any hardware vendor's graphics card that supports the OpenGL Shading Language.
The CPU sends instructions (compiled shading language programs) and geometry data to the graphics processing unit, located on the graphics card. Within the vertex shader, the geometry is transformed. If a geometry shader is in the graphics processing unit and active, some changes of the geometries in the scene are performed.
OpenGL ES 1.1, and OpenGL ES 2.0 support; OpenGL 3.x and 4.x support along with associated OpenGL extensions; Support for Android on tablets and phones; Support for IOS on tablets and phones (end users applications have already been accepted on the App Store) Introduction of Present3D application for immersive 3D presentations
Apple has created a low-level graphics API, called Metal, which runs on most Macs made since 2012, iPhones since the 5S, and iPads since the iPad Air. Metal has its own shading language called Metal Shading Language (MSL), which is based on C++14 and implemented using clang and LLVM. MSL unifies vertex, fragment and compute processing. [12]