https://developer.mozilla.org/en-US/docs/Web/API/OES_draw_buffers_indexed/blendEquationSeparateiOES
OES_draw_buffers_indexed: blendEquationSeparateiOES() method - Web APIs | MDN
The blendEquationSeparateiOES() method of the OES_draw_buffers_indexed WebGL extension sets the RGB and alpha blend equations separately for a particular draw...
web apisoesdrawbuffersindexed