glBlendColor(3G) OpenGL Reference 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 GL_ARB_imaging subset. glBlendColor is
present only if GL_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
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