glBlendColor — set the blend color
void glBlendColor( | GLclampf | red, |
GLclampf | green, | |
GLclampf | blue, | |
GLclampf | alpha) ; |
The GL_BLEND_COLOR
may be used to calculate the source and destination
blending factors. The color components are clamped to the range
GL_BLEND_COLOR
is set to (0, 0, 0, 0).
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.
GL_INVALID_OPERATION
is generated if glBlendColor
is executed
between the execution of glBegin and the corresponding
execution of glEnd.
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/.