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// intersection.slang
//TEST:SIMPLE(filecheck=CHECK): -profile glsl_460+GL_NV_ray_tracing -stage intersection -entry main -target spirv-assembly
//TEST:SIMPLE(filecheck=CHECK): -emit-spirv-directly -stage intersection -entry main -target spirv-assembly
struct Sphere
{
float3 position;
float radius;
};
struct SphereHitAttributes
{
float3 normal;
};
bool rayIntersectsSphere(
RayDesc ray,
Sphere sphere,
out float tHit,
out SphereHitAttributes attrs)
{
// HACK: this is obviously incorrect,
// but we just need some code for testing
tHit = sphere.radius;
attrs.normal = sphere.position;
return tHit >= ray.TMin;
}
cbuffer U
{
Sphere gSphere;
}
void main()
{
RayDesc ray;
ray.Origin = ObjectRayOrigin();
ray.Direction = ObjectRayDirection();
ray.TMin = RayTMin();
ray.TMax = RayTCurrent();
float tHit;
SphereHitAttributes attrs;
if(rayIntersectsSphere(ray, gSphere, tHit, attrs))
{
ReportHit(tHit, 0, attrs);
}
}
// CHECK: OpEntryPoint Intersection{{NV|KHR}} %main "main"
// CHECK: OpDecorate %{{[a-zA-Z0-9_]+}} BuiltIn RayTmin{{NV|KHR}}
// CHECK-DAG: %[[ATTR:[A-Za-z0-9_]+]] = OpVariable %_ptr_HitAttribute{{NV|KHR}}_SphereHitAttributes{{.*}} HitAttribute{{NV|KHR}}
// CHECK-DAG: %[[VAL:[A-Za-z0-9_]+]] = Op{{.+}} %SphereHitAttributes{{.*}} {{.*}}
// CHECK-DAG: OpStore %[[ATTR]] %[[VAL]]
// CHECK-DAG: OpReportIntersectionKHR
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