Module rt 

The ray tracing pipeline’s operations. WGSL has no ray tracing pipeline and naga’s has no ReportHit, IgnoreHit, CallShader or hit-group indices, so a ray tracing program (see crate::stage_functions) does what the pipeline does for it by calling functions of its own module that have no body: the call is the operation, the arguments its operands, and a consumer that traces rays reads the calls. A stub’s body is empty (a function that returns a value returns false), so nothing that runs the module as written runs the pipeline.

name	arguments	result
TRACE_RAY	acceleration structure, ray flags, instance mask, hit group offset, hit group stride, miss index, origin (vec3<f32>), t min, direction (vec3<f32>), t max, pointer to the payload
REPORT_HIT	t (f32), hit kind (u32), pointer to the attributes	whether the hit was accepted (bool)
CALL_SHADER	shader index (u32), pointer to the parameter
IGNORE_HIT		(the program ends)
ACCEPT_HIT_AND_END_SEARCH		(the program ends)

Constants

ACCEPT_HIT_AND_END_SEARCH

AcceptHitAndEndSearch: an any-hit program accepts the hit, stops the search and ends.

CALL_SHADER

CallShader: run a callable program.

IGNORE_HIT

IgnoreHit: an any-hit program rejects the candidate hit and ends.

OPERATIONS

Every operation, by name.

REPORT_HIT

ReportHit: an intersection program reports a hit at t.

TRACE_RAY

TraceRay: shoot a ray into an acceleration structure; the payload is read and written by the programs it runs.