Struct glium::draw_parameters::SamplesPassedQuery
source · pub struct SamplesPassedQuery { /* private fields */ }
Expand description
A query that allows you to know the number of samples written to the output during the draw operations where this query was active.
If you just want to know whether or not some samples have been written, you should use
a AnySamplesPassedQuery
query instead.
Implementations§
source§impl SamplesPassedQuery
impl SamplesPassedQuery
sourcepub fn new<F>(facade: &F) -> Result<SamplesPassedQuery, QueryCreationError>where
F: Facade + ?Sized,
pub fn new<F>(facade: &F) -> Result<SamplesPassedQuery, QueryCreationError>where F: Facade + ?Sized,
Builds a new query.
source§impl SamplesPassedQuery
impl SamplesPassedQuery
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.