tests/autodiff/backward-diff-check.slang


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//TEST(compute):COMPARE_COMPUTE_EX:-slang -compute -shaderobj -output-using-type
//TEST(compute, vulkan):COMPARE_COMPUTE_EX:-vk -compute -shaderobj -output-using-type

//TEST_INPUT:ubuffer(data=[0 0 0 0 0], stride=4):out,name=outputBuffer
RWStructuredBuffer<float> outputBuffer;

typedef DifferentialPair<float> dpfloat;
typedef float.Differential dfloat;

[BackwardDifferentiable]
float test()
{
    return 2.0f;
}

float noDiffFunc(float x) { return x; }
[BackwardDerivativeOf(test)]
void d_test(float dOut)
{
    outputBuffer[0] = noDiffFunc(dOut);
}

[numthreads(1, 1, 1)]
void computeMain(uint3 dispatchThreadID : SV_DispatchThreadID)
{
    __bwd_diff(test)(3.0f);
}