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https://stackoverflow.com/questions/27407774/get-supported-glsl-versions
Jan 04, 2019 · Since GL 4.3, you can simply query the list of all of the supported GLSL versions via glGetStringi(GL_SHADING_LANGUAGE_VERSION,...). For versions prior to that, you have to check the GL version number and the extension string(s) to deduce which versions are guaranteed to be supported (but the implementation might still support more).
https://support.esri.com/en/technical-article/000011375
Jun 27, 2019 · OpenGL drivers are usually installed together with the rest of the graphics driver and support software (such as DirectX). Procedure. Instructions provided describe how to check what type of graphics card is installed on the system and which version of OpenGL is running. Check the graphics card type (Windows):
https://plugins.jetbrains.com/plugin/6993-glsl-support
Support for GLSL - the OpenGL Shading Language.
https://devtalk.nvidia.com/default/topic/522914/opengl/checking-glsl-driver-support/
Nov 03, 2012 · Checking GLSL Driver Support To put it simple, we often come across that a user say that they are unable to or that their computer is unable to compile our shaders, but their GPU can clearly handle it, it’s just that they are using an old driver and need to update.
https://www.khronos.org/opengl/wiki/Detecting_the_Shader_Model
Earlier GLSL versions for OpenGL 3.x provide subsets of this functionality, based on the available functionality in the OpenGL version, though 1.50 is almost feature-identical to SM4. Direct3D Shader Model 5.0 is equivalent to GLSL version 4.30. For earlier shader models, GLSL versions less than 1.30 are used.
https://www.khronos.org/opengl/wiki/Core_Language_(GLSL)
The OpenGL Shading Language is a C-style language, so it covers most of the features you would expect with such a language. Control structures (for-loops, if-else statements, etc) exist in GLSL, including the switch statement. This section will not cover the entire language in detail; the GLSL specification can handle that. This Wiki page will note the differences between GLSL …
https://community.khronos.org/t/which-graphics-cards-support-glsl/51916
Mar 17, 2019 · All cards that support DirectX 8 (pixel shader 1.1 or higher) support programmable vertex shaders and some form of programmable pixel processing. The GL vertex program extension deals with vertices, but the per-pixel processing varies by vendor; you can check each vendor’s extension registry for specific model support.
https://buffered.com/support/solve-opengl-error/
All that sounds complicated, but the info will help you understand how manufacturers provide driver support to Linux users, and why you need to get the right driver update to fix OpenGL errors. While some only offer support for Open Source efforts through the DRI, others only rely on closed source frameworks.
https://www.khronos.org/registry/OpenGL-Refpages/gl4/html/isnan.xhtml
Description. For each element i of the result, isnan returns true if x[i] is posititve or negative floating point NaN (Not a Number) and false otherwise.
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