[HOpenGL] GL_BLEND

[Sven Panne]

Glynn Clements wrote:
> Does this rely upon the underlying OpenGL implementation/driver
> supporting glBlendEquation() (i.e. OpenGL 1.3 or 1.2+GL_ARB_imaging)?

Yes, blendEquation depends on the glBlendEquationEXT extension function.
If the extension is not supported, an exception with the message

    unknown OpenGL call glBlendEquationEXT, check for GL_EXT_blend_minmax or GL_EXT_blend_subtract or OpenGL 1.4

should be thrown, not a segfault. This is a bit mysterious...

Cheers,
    S.