OpenGL Shading Language: Difference between revisions

Revision as of 13:58, 23 April 2020

Revision as of 19:20, 26 April 2020

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The two languages are similar but different. They can be interconverted through [[Standard Portable Intermediate Representation|SPIR-Cross]].<ref>{{Citation|last=|first=|title=KhronosGroup/SPIRV-Cross|date=2019-09-06|url=https://github.com/KhronosGroup/SPIRV-Cross|volume=|pages=|publisher=The Khronos Group|access-date=2019-09-08}}</ref>

==Operators Language ==

===Operators===

GLSL contains same operators as the [[operators in C and C++]], with the exception of [[Pointer (computer programming)|pointer]]s. [[Bitwise operators]] were added in version 1.30.

===Functions and control structures===

Similar to the [[C (programming language)|C programming language]], GLSL supports loops and branching, for instance: if-else, for, switch, etc. Recursion is forbidden and checked for during compilation.

User-defined functions are supported and built-in functions are provided. The graphics card manufacturer may optimize built-in functions at the hardware level. Many of these functions are similar to those in the math library of the C programming language while others are specific to graphics programming.

=== Preprocessor ===

GLSL defines a subset of the [[C preprocessor]] (CPP), combined with its own special directives for specifying versions and OpenGL extensions. The parts removed from CPP are those relating to file names such as {{code|#include}} and {{code|__FILE__}}.

==Compilation and execution==