glIsShader 3G
glIsShader determine if a name corresponds to a shader object

## C Specification

GLboolean `glIsShader` GLuint shader

## Parameters

shader

  Specifies a potential shader object.

## Description

`glIsShader` returns `GL_TRUE` if shader is the name of a shader object previously created with glCreateShader and not yet deleted with glDeleteShader. If shader is zero or a non-zero value that is not the name of a shader object, or if an error occurs, `glIsShader` returns `GL_FALSE`.

## Notes

No error is generated if shader is not a valid shader object name.

A shader object marked for deletion with glDeleteShader but still attached to a program object is still considered a shader object and `glIsShader` will return `GL_TRUE`.

## See Also

glCreateShader, glDeleteShader

## Copyright

Copyright 2003-2005 3Dlabs Inc. Ltd. This material may be distributed subject to the terms and conditions set forth in the Open Publication License, v 1.0, 8 June 1999. http://opencontent.org/openpub/.