yum-mirror/slang

Making it easier to work with shaders

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

Harsh Aggarwal (NVIDIA)Fix 7723 - Add autodiff tests (#7919)d10732742

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1// Test calling differentiable function through dynamic dispatch.
2
3//TEST(compute):COMPARE_COMPUTE_EX:-slang -compute -shaderobj -output-using-type
4//TEST(compute):COMPARE_COMPUTE_EX:-cuda -compute -shaderobj -output-using-type
5//TEST(compute, vulkan):COMPARE_COMPUTE_EX:-vk -compute -shaderobj -output-using-type
6
7//TEST_INPUT:ubuffer(data=[0 0 0 0 0], stride=4):out,name=outputBuffer
8RWStructuredBuffer<float> outputBuffer;
9
10[anyValueSize(16)]
11interface IInterface
12{
13    static float calc(float x);
14}
15
16struct A : IInterface
17{
18    static float calc(float x) { return 1.0; }
19};
20
21struct B : IInterface
22{
23    static float calc(float x) { return 2.0; }
24};
25
26void dsqr<T:IInterface>(T obj, inout DifferentialPair<float> x, float dOut)
27{
28    float diff = 2.0 * x.p * dOut;
29    updateDiff(x, diff);
30}
31
32[BackwardDerivative(dsqr)]
33float sqr<T:IInterface>(T obj, float x)
34{
35    return no_diff(obj.calc(x)) + x * x;
36}
37
38// Use automatically differentiated outer function to triger the primal/propagate func generation logic
39// on a function that has user provided backward derivative.
40[BackwardDifferentiable]
41float sqr_outter<T:IInterface>(T obj, float x)
42{
43    return sqr(obj, x);
44}
45
46//TEST_INPUT: type_conformance A:IInterface = 0
47//TEST_INPUT: type_conformance B:IInterface = 1
48
49
50[numthreads(1, 1, 1)]
51void computeMain(uint3 dispatchThreadID : SV_DispatchThreadID)
52{
53    var obj = createDynamicObject<IInterface>(dispatchThreadID.x, 0); // A
54    var p = DifferentialPair<float>(2.0, 1.0);
55    __bwd_diff(sqr_outter)(obj, p, 1.0); // A.calc, expect 4
56    outputBuffer[0] = p.d;
57
58    obj = createDynamicObject<IInterface>(dispatchThreadID.x + 1, 0); // B
59    p = DifferentialPair<float>(1.5, 1.0);
60    __bwd_diff(sqr)(obj, p, 1.0);                                                     // A.calc, expect 4
61    outputBuffer[1] = p.d; // B.calc, expect 3
62}