Why are glBlendEquation() and glBlendColor() part of the GL_VERSION_1_4
set and not part of GL_ARB_imaging core set. These two functions are
part of the imaging subset included as part of OpenGL 1.2.
I am using OpenGL 1.3 with GL_ARB_imaging extension support. The
glBlendEquation() works correctly. When I link in the glew library,
this function is no longer defined because it is associated with
GL_VERSION_1_4 and not GL_ARB_imaging.