yum-mirror/slang

Making it easier to work with shaders

git clone https://git.yummers.dev/yum-mirror/slang

Theresa FoleyAdd warning on mutation of function parameter (#3067)0b2d7533d

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1// ray-query-subroutine.slang
2
3// Regression test for passing a `RayQuery` value into a subroutine.
4
5//TEST:CROSS_COMPILE: -profile sm_6_5 -stage compute -entry computeMain -target dxil-assembly
6
7RWStructuredBuffer<int> gOutput;
8RaytracingAccelerationStructure gScene;
9
10float3 helper<let N : uint>(inout RayQuery<N> q)
11{
12    RayDesc ray;
13    ray.Origin = 0;
14    ray.Direction = 0;
15    ray.TMin = 0;
16    ray.TMax = 1000.0;
17    q.TraceRayInline(
18        /* accellerationStructure: */   gScene,
19        /* rayFlags: */                 N,
20        /* instanceInclusionmask: */    0xFFFFFFFF,
21        /* ray: */                      ray );
22
23    return q.WorldRayDirection();
24}
25
26[shader("compute")]
27void computeMain(uint tid : SV_DispatchThreadID)
28{
29    // Note: The original issue was due to "folding" of an instruction
30    // into use sites as part of emitting high-level-language code.
31    //
32    // In this case, the initial value of `rayQuery` has only a single
33    // use (in the call to `helper()`) and as a result was subject to
34    // "folding" during emit, because it had no side-effects.
35
36    RayQuery<0> rayQuery;
37    let result = helper(rayQuery);
38
39    gOutput[tid.x] = int(result.x);
40}