Struct nannou::ui::backend::glium::glium::draw_parameters::TimeElapsedQuery
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pub struct TimeElapsedQuery { /* fields omitted */ }
A query that allows you to know the number of nanoseconds that have elapsed during the draw operations.
TODO: not sure that it's nanoseconds
Methods
impl TimeElapsedQuery
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pub fn new<F>(facade: &F) -> Result<TimeElapsedQuery, QueryCreationError> where
F: Facade + ?Sized,
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F: Facade + ?Sized,
Builds a new query.
impl TimeElapsedQuery
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pub fn is_ready(&self) -> bool
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Queries the counter to see if the result is already available.
pub 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.
pub fn to_buffer_u32(
&self,
target: BufferSlice<u32>
) -> Result<(), ToBufferError>
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&self,
target: BufferSlice<u32>
) -> Result<(), ToBufferError>
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 GlObject for TimeElapsedQuery
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type Id = u32
The type of identifier for this object.
fn get_id(&self) -> u32
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Returns the id of the object.