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//TEST(compute, vulkan):COMPARE_COMPUTE_EX:-vk -compute -shaderobj -output-using-type
//TEST(compute):COMPARE_COMPUTE_EX:-cuda -compute -shaderobj -output-using-type
//TEST_INPUT:ubuffer(data=[0 0 0 0], stride=4):out,name=outputBuffer
RWStructuredBuffer<float> outputBuffer;
[BackwardDifferentiable]
float bsdf()
{
return 0.5;
}
[ForwardDerivativeOf(bsdf)]
DifferentialPair<float> d_bsdf()
{
return diffPair(0.5f, 1.0f);
}
[BackwardDerivativeOf(bsdf)]
void d_bsdf(float dOut)
{
outputBuffer[0] += dOut;
}
[BackwardDifferentiable]
float tracePath()
{
float thp = 1.0;
float L = 0.0;
uint depth = 0;
for (int i = 0; i < 3; ++i)
{
if (depth <= 2)
{
thp = thp * bsdf();
L = thp * 1.0;
if (depth >= 2) break;
depth = depth + 1;
}
else
{
L = 0.0;
}
}
return L;
}
[numthreads(1, 1, 1)]
void computeMain(uint3 dispatchThreadID: SV_DispatchThreadID)
{
{
__bwd_diff(tracePath)(1.0); // Expect: 1.0 in outputBuffer[0]
}
}
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