GLBLENDCOLOR(3G)

NAME
glBlendColor - set the blend color

C SPECIFICATION

void glBlendColor(GLclampf red, GLclampf green, GLclampf blue, GLclampf 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 glBlendFunc() for a complete description of the blending operations. Initially the GL_BLEND_COLOR is set to (0, 0, 0, 0).

NOTES

glBlendColor is part of the ARB_imaging subset. glBlendColor is present only if ARB_imaging is returned when glGetString() is called with GL_EXTENSIONS as its argument.

ERRORS

GL_INVALID_OPERATION is generated if glBlendColor is executed between the execution of glBegin() and the corresponding execution of glEnd().

ASSOCIATED GETS

glGet() with an argument of GL_BLEND_COLOR

SEE ALSO

glBlendEquation(), glBlendFunc(), glGetString()

COPYRIGHT

Copyright © 1991-2006 Silicon Graphics, Inc. This document is licensed under the SGI Free Software B License. For details, see http://oss.sgi.com/projects/FreeB/.