GL_KHR_blend_equation_advanced
http://www.opengl.org/registry/specs/KHR/blend_equation_advanced.txt
GL_KHR_blend_equation_advanced
	GL_BLEND_ADVANCED_COHERENT_KHR 0x9285
	GL_MULTIPLY_KHR 0x9294
	GL_SCREEN_KHR 0x9295
	GL_OVERLAY_KHR 0x9296
	GL_DARKEN_KHR 0x9297
	GL_LIGHTEN_KHR 0x9298
	GL_COLORDODGE_KHR 0x9299
	GL_COLORBURN_KHR 0x929A
	GL_HARDLIGHT_KHR 0x929B
	GL_SOFTLIGHT_KHR 0x929C
	GL_DIFFERENCE_KHR 0x929E
	GL_EXCLUSION_KHR 0x92A0
	GL_HSL_HUE_KHR 0x92AD
	GL_HSL_SATURATION_KHR 0x92AE
	GL_HSL_COLOR_KHR 0x92AF
	GL_HSL_LUMINOSITY_KHR 0x92B0
	void glBlendBarrierKHR (void)
