GL_OES_draw_buffers_indexed
https://www.khronos.org/registry/OpenGL/extensions/OES/OES_draw_buffers_indexed.txt
GL_OES_draw_buffers_indexed

	void glBlendEquationSeparateiOES (GLuint buf, GLenum modeRGB, GLenum modeAlpha)
	void glBlendEquationiOES (GLuint buf, GLenum mode)
	void glBlendFuncSeparateiOES (GLuint buf, GLenum srcRGB, GLenum dstRGB, GLenum srcAlpha, GLenum dstAlpha)
	void glBlendFunciOES (GLuint buf, GLenum src, GLenum dst)
	void glColorMaskiOES (GLuint buf, GLboolean r, GLboolean g, GLboolean b, GLboolean a)
	void glDisableiOES (GLenum target, GLuint index)
	void glEnableiOES (GLenum target, GLuint index)
	GLboolean glIsEnablediOES (GLenum target, GLuint index)