msalph(3G)msalph(3G)NAMEmsalph - 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.
Page 1
