gl_InstanceID — contains the index of the current primitive in an instanced draw command
in highp int gl_InstanceID ;
gl_InstanceID is a vertex language input variable that
holds the integer index of the current primitive in an instanced draw
command such as
glDrawArraysInstanced. If the current
primitive does not originate from an instanced draw command, the value
gl_InstanceID is zero.
|OpenGL ES Shading Language Version|
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