glPrimitiveRestartIndex — specify the primitive restart index
glPrimitiveRestartIndex specifies a vertex array element that is treated specially when
primitive restarting is enabled. This is known as the primitive restart index.
When one of the
Draw* commands transfers a set of generic attribute array elements to
the GL, if the index within the vertex arrays corresponding to that set is equal to the primitive restart
index, then the GL does not process those elements as a vertex. Instead, it is as if the drawing command
ended with the immediately preceding transfer, and another drawing command is immediately started with
the same parameters, but only transferring the immediately following element through the end of the
originally specified elements.
When either glDrawElementsBaseVertex, glDrawElementsInstancedBaseVertex or glMultiDrawElementsBaseVertex is used, the primitive restart comparison occurs before the basevertex offset is added to the array index.
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