Struct glium::draw_parameters::PrimitivesGeneratedQuery
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[src]
pub struct PrimitivesGeneratedQuery {
// some fields omitted
}Query that allows you to know the number of primitives generated by the geometry shader.
Will stay at 0 if you use it without any active geometry shader.
Methods
impl PrimitivesGeneratedQuery
fn new<F>(facade: &F) -> Result<PrimitivesGeneratedQuery, QueryCreationError> where F: Facade
Builds a new query.
impl PrimitivesGeneratedQuery
fn is_ready(&self) -> bool
Queries the counter to see if the result is already available.
fn get(self) -> u32
Returns the value of the query. Blocks until it is available.
This function doesn't block if is_ready would return true.
Note that you are strongly discouraged from calling this in the middle of the rendering process, as it may block for a long time.
Queries should either have their result written into a buffer, be used for conditional rendering, or stored and checked during the next frame.