yum-mirror/slang

Making it easier to work with shaders

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

Sai Praveen BangaruAssorted auto-diff enhancements for increased performance & more streamlined auto-diff results (#5394)b61be5e6f

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1//TEST(compute):COMPARE_COMPUTE_EX:-cpu -compute -output-using-type -shaderobj
2//TEST(compute):COMPARE_COMPUTE_EX:-vk -compute -shaderobj -output-using-type
3//TEST(compute):COMPARE_COMPUTE_EX:-cuda -compute -shaderobj -output-using-type
4//TEST(compute):COMPARE_COMPUTE_EX:-dx12 -compute -shaderobj -output-using-type
5
6
7//TEST_INPUT:ubuffer(data=[0 0 0 0], stride=4):out,name=outputBuffer
8RWStructuredBuffer<float> outputBuffer;
9
10struct A : IDifferentiable
11{
12    float x;
13    int nx;
14}
15
16[BackwardDifferentiable]
17float f(A x)
18{
19    A rs;
20    rs.x = 1.0;
21    for (int i = 0; i < 2; i++)
22        rs.x = rs.x * x.x;
23    return rs.x;
24}
25
26[BackwardDifferentiable]
27float outerF(A x)
28{
29    A nx;
30    nx.x = 1.0;
31    int i = 0;
32    [MaxIters(3)]
33    do
34    {
35        nx.x = nx.x * x.x;
36        i++;
37    }
38    while (i < 2);
39    nx.nx = 2;//x.nx;
40    return f(nx);
41}
42
43[BackwardDifferentiable]
44float df(A x)
45{
46    A.Differential ad;
47    ad.x = 0.0;
48    var p = diffPair(x, ad);
49    __bwd_diff(outerF)(p, 1.0);
50    return p.d.x;
51}
52
53[numthreads(1, 1, 1)]
54void computeMain(uint3 dispatchThreadID : SV_DispatchThreadID)
55{
56    // Given f(x) = x^4,
57    // f''(x) = 12 * x^2
58    // Expect f''(4) = 192
59    A a;
60    a.x = 4.0;
61    a.nx = 54;
62    A.Differential ad;
63    ad.x = 1.0;
64    var p = diffPair(a, ad);
65    outputBuffer[0] = __fwd_diff(df)(p).d;
66}