NAME
	  glIsTexture -	determine if a name corresponds	to a texture


     C SPECIFICATION
	  GLboolean glIsTexture( GLuint	texture	)


     PARAMETERS
	  texture  Specifies a value that may be the name of a
		   texture.

     DESCRIPTION
	  glIsTexture returns GL_TRUE if texture is currently the name
	  of a texture.	 If texture is zero, or	is a non-zero value
	  that is not currently	the name of a texture, or if an	error
	  occurs, glIsTexture returns GL_FALSE.

     NOTES
	  glIsTexture is available only	if the GL version is 1.1 or
	  greater.

     ERRORS
	  GL_INVALID_OPERATION is generated if glIsTexture is executed
	  between the execution	of glBegin and the corresponding
	  execution of glEnd.

     SEE ALSO
	  glBindTexture, glCopyTexImage1D, glCopyTexImage2D,
	  glDeleteTextures, glGenTextures, glGet, glGetTexParameter,
	  glTexImage1D,	glTexImage2D,
	  glTexParameter