Geometry Shader Functions
These functions are available only in geometry shaders to manage the output data streams created by this stage.
The function EmitStreamVertex specifies that a vertex is completed. A vertex is added to the current output primitive in vertex stream stream using the current values of all output variables associated with stream. These include gl_PointSize, gl_ClipDistance[], gl_Layer, gl_Position, gl_PrimitiveID, and gl_ViewportIndex. The values of all output variables for all output streams are undefined after a call to EmitStreamVertex. If a geometry shader invocation has emitted more vertices than permitted by the output layout qualifier max_vertices, the results of calling EmitStreamVertex are undefined.
The function ...
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