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