msalph(3G)

NAME
     msalph - specifies treatment of alpha values during multisample rendering

FORTRAN 77 SPECIFICATION
     subroutine msalph(mode)
     integer*4 mode

PARAMETERS
     mode   is a symbolic constant.  MSAMAS and MSAMAO indicates that alpha
            values are to be converted to multisample mask values just prior
            to the alpha test.  MSAALP indicates that no such conversion is to
            be done.  The default is MSAALP.

DESCRIPTION
     When msalpha is set to MSAMAS or MSAMAO while multisampling is enabled,
     source alpha values generated by rasterization are converted to
     multisample masks immediately prior to the per-pixel alpha tests.  At
     each pixel the resulting multisample mask is logically ANDed with the
     mask specified by msmask.  Only multisample locations enabled by the
     resulting mask are considered for modification.

     When msalpha is set to MSAMAO, the source alpha becomes 1.0 after the
     mask has been generated.

     When msalpha is set to MSAALP, no change is made to the alpha values
     generated by rasterization or to the mask specified by msmask.

     msalph has no effect when multisample is not enabled.

SEE ALSO
     msmask, mspatt, mssize, multis

NOTE
     IRIS-4D G, GT, GTX, VGX, and VGXT models, the Personal Iris, Indigo
     Entry, Indy, XL, XS, XS24, XZ, Elan and Extreme systems do not support
     msalph.