DECLARATION  
  in int gl_SampleMaskIn[] ;.SH
    "DESCRIPTION" 
  gl_SampleMaskIn  is a fragment language that indicates the
    set of samples covered by the primitive generating the fragment during
    multisample rasterization. It has a sample bit set if and only if the sample
    is considered covered for this fragment shader invocation. Bit  B  of
    mask  gl_SampleMask[M]  corresponds to sample 32 *  M  +  B .
    The array has  ceil ( s  / 32) elements where  s  is the
    maximum number of color samples supported by the implementation. 
 
  VERSION
  SUPPORT  
  
   
        
        OpenGL Shading
      Language Version  
   
   
        Variable Name  
        1.10  
        1.20  
        1.30  
        1.40  
        1.50  
        3.30  
        4.00  
        4.10  
        4.20  
        4.30  
        4.40  
        4.50  
   
   
     gl_SampleMaskIn 
     - 
     - 
     - 
     - 
     - 
     - 
     ✔ 
     ✔ 
     ✔ 
     ✔ 
     ✔ 
     ✔ 
   
 
  
 
  SEE
  ALSO  
   gl_SampleMask (),  gl_SampleID (),
     gl_SamplePosition (),  gl_FragCoord () 
 
  COPYRIGHT  
  Copyright © 2011-2014 Khronos Group. 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/ . 
 
  COPYRIGHT  
  Copyright © 2011-2014 Khronos Group