fglBlendColor(3G)

NAME
     fglBlendColor - set the blend color


FORTRAN SPECIFICATION
     SUBROUTINE fglBlendColor( REAL*4 red,
                               REAL*4 green,
                               REAL*4 blue,
                               REAL*4 alpha )


PARAMETERS
     red, green, blue, alpha
                           specify the components of GL_BLEND_COLOR

DESCRIPTION
     The GL_BLEND_COLOR may be used to calculate the source and destination
     blending factors. The color components are clamped to the range [0, 1]
     before being stored. See fglBlendFunc for a complete description of the
     blending operations.  Initially the GL_BLEND_COLOR is set to (0, 0, 0,
     0).

NOTES
     fglBlendColor is part of the GL_ARB_imaging subset. fglBlendColor is
     present only if GL_ARB_imaging is returned when fglGetString is called
     with GL_EXTENSIONS as its argument.

ERRORS
     GL_INVALID_OPERATION is generated if fglBlendColor is executed between
     the execution of fglBegin and the corresponding execution of fglEnd.

ASSOCIATED GETS
     fglGet with an argument of GL_BLEND_COLOR


SEE ALSO
     fglBlendEquation, fglBlendFunc, fglGetString