Struct glium::draw_parameters::PrimitivesGeneratedQuery

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.

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 necessarly supported everywhere.

Trait Implementations

impl Debug for PrimitivesGeneratedQuery

fn fmt(&self, __arg_0: &mut Formatter) -> Result

Formats the value using the given formatter.

impl GlObject for PrimitivesGeneratedQuery

type Id = GLuint

The type of identifier for this object.

fn get_id(&self) -> GLuint

Returns the id of the object.