android - OpenGL ES performance of different blending modes -

android - OpenGL ES performance of different blending modes -

i need apply full-screen photographic-like vignette effect on rendered scene. obviously, have utilize blending accomplish this. take fastest possible blending mode because applied screen space.

do blending modes in opengl es work faster another? or blending mode work @ same fill-rate? far haven't found resources on net saying blending modes slower or faster ones, decided inquire question on so.

this android app, understand of course of study behavior can depend on gpu vendor, maybe there mutual considerations faster blending?

the 1 single slow part of blending reading pixels backbuffer(doesn't matter alpha or rgb or both). long it's 'real' blending using dst color/alpha(i.e. not using degenerate blend func glblendfunc(gl_one, gl_zero)or glblendfunc(gl_zero, gl_one) or similar) - there's no performance difference.

android performance opengl-es opengl-es-2.0