Struct glium::draw_parameters::TimeElapsedQuery
source · pub struct TimeElapsedQuery { /* private fields */ }
Expand description
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
Implementations§
source§impl TimeElapsedQuery
impl TimeElapsedQuery
sourcepub fn new<F>(facade: &F) -> Result<TimeElapsedQuery, QueryCreationError>where
F: Facade + ?Sized,
pub fn new<F>(facade: &F) -> Result<TimeElapsedQuery, QueryCreationError>where F: Facade + ?Sized,
Builds a new query.
source§impl TimeElapsedQuery
impl TimeElapsedQuery
sourcepub fn get(self) -> u32
pub 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.
sourcepub fn to_buffer_u32(
&self,
target: BufferSlice<'_, u32>
) -> Result<(), ToBufferError>
pub fn to_buffer_u32( &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.