Struct nannou::ui::backend::glium::glium::draw_parameters::PrimitivesGeneratedQuery
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pub struct PrimitivesGeneratedQuery { /* 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
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fn new<F>(facade: &F) -> Result<PrimitivesGeneratedQuery, QueryCreationError> where
F: Facade + ?Sized,
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F: Facade + ?Sized,
Builds a new query.
impl PrimitivesGeneratedQuery
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fn is_ready(&self) -> bool
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Queries the counter to see if the result is already available.
fn get(self) -> u32
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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.
fn to_buffer_u32(&self, target: BufferSlice<u32>) -> Result<(), ToBufferError>
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Writes the result of the query to a buffer when it is available.
This function doesn't block. Instead it submits a commands to the GPU's commands queue and orders the GPU to write the result of the query to a buffer.
This operation is not necessarily supported everywhere.
Trait Implementations
impl Debug for PrimitivesGeneratedQuery
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fn fmt(&self, __arg_0: &mut Formatter) -> Result<(), Error>
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Formats the value using the given formatter.