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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(compute):COMPARE_COMPUTE_EX:-cpu -compute -output-using-type -shaderobj
//TEST_INPUT:ubuffer(data=[0 0 0 0 0], stride=4):out,name=outputBuffer
RWStructuredBuffer<float> outputBuffer;
// This test checks to ensure that expressions of the form FieldExtract(MakeStruct(...))
// are handled correctly in the presence of differentiation.
// Such expressions are often optimized out, and the non-differentiability of the struct
// type can be accidentally overlooked.
//
typedef DifferentialPair<float> dpfloat;
typedef float.Differential dfloat;
struct Data
{
[PreferRecompute]
__init(float tin)
{
this.t = tin;
}
float t;
};
[BackwardDifferentiable]
float test_make_struct(float y)
{
Data d = { y };
return d.t;
}
[numthreads(1, 1, 1)]
void computeMain(uint3 dispatchThreadID : SV_DispatchThreadID)
{
{
dpfloat dpa = dpfloat(1.0, 0.0);
bwd_diff(test_make_struct)(dpa, 1.0f);
outputBuffer[0] = dpa.d; // Expect: 0.0
}
}
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