Template:Require glsl

This template is used for inline citations of required OpenGL version numbers and/or extensions. It creates a phrase of the form "OpenGL <Version> or <Extension>". It takes 3 positional parameters:

1. The OpenGL version number. If it's blank, the phrase "OpenGL <Version> or" won't be part of the text.
2. The extension name. If it's blank, the phrase "or <Extension>" won't be part of the text.
3. The prefix of the extension, as for Template:Extref. ARB extensions don't need one.

Examples:

Just OpenGL version	{{require glsl|4.40}}	GLSL 4.40
Just extension	{{require glsl||shader_texture_image_samples}}	ARB_shader_texture_image_samples
Both	{{require glsl|4.50|shader_texture_image_samples}}	GLSL 4.50 or ARB_shader_texture_image_samples