Determining which vertex of a triangle one is computing in openGL ES vertex shader -


i'm writing webgl program draws bunch of triangles screen. i'm using indirect addressing, this:

gl.drawelements(gl.triangles, list.length, gl.unsigned_short, 0);

is there way vertex shader know vertex of triangle processing? (among 3 vertices in order given list, i.e., first, second or last)

you can use additional integer attribute in stride alongside vertex coordinates, texture coordinates, normal, etc. check id of vertex.


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