GL_EXT_draw_buffers_indexed
https://www.khronos.org/registry/OpenGL/extensions/EXT/EXT_draw_buffers_indexed.txt
GL_EXT_draw_buffers_indexed

	void glBlendEquationSeparateiEXT (GLuint buf, GLenum modeRGB, GLenum modeAlpha)
	void glBlendEquationiEXT (GLuint buf, GLenum mode)
	void glBlendFuncSeparateiEXT (GLuint buf, GLenum srcRGB, GLenum dstRGB, GLenum srcAlpha, GLenum dstAlpha)
	void glBlendFunciEXT (GLuint buf, GLenum src, GLenum dst)
	void glColorMaskiEXT (GLuint buf, GLboolean r, GLboolean g, GLboolean b, GLboolean a)
	void glDisableiEXT (GLenum target, GLuint index)
	void glEnableiEXT (GLenum target, GLuint index)
	GLboolean glIsEnablediEXT (GLenum target, GLuint index)