glBlendColor — set the blend color
GL_BLEND_COLOR may be used to calculate the source and destination blending factors. The color components are clamped to the range 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).
glGet with an argument of
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/.