Fix several autodiff bugs. (#2643)

1 files changed, 46 insertions, 0 deletions

diff --git a/tests/autodiff/bsdf/bsdf-sample.slang b/tests/autodiff/bsdf/bsdf-sample.slang
new file mode 100644
index 000000000..8a9508791
--- /dev/null
+++ b/tests/autodiff/bsdf/bsdf-sample.slang
@@ -0,0 +1,46 @@
+//TEST(compute, vulkan):COMPARE_COMPUTE_EX:-vk -compute -shaderobj -output-using-type
+//TEST(compute):COMPARE_COMPUTE_EX:-slang -compute -shaderobj -output-using-type
+
+//TEST_INPUT:ubuffer(data=[0 0 0 0 0 0 0 0 0 0], stride=4):out,name=outputBuffer
+RWStructuredBuffer<float> outputBuffer;
+
+__exported import bsdf_auto_rev;
+
+[numthreads(1, 1, 1)]
+void computeMain(uint3 dispatchThreadID: SV_DispatchThreadID)
+{
+    ShadingData sd;
+    sd.N = float3(0, 0, 1);
+    sd.T = float3(1, 0, 0);
+    sd.B = float3(0, 1, 0);
+    sd.V = normalize(float3(0.3, 0.5, 0.8));
+
+    {
+        DifferentialPair<Auto_Bwd_BSDFParameters> dp_params = DifferentialPair<Auto_Bwd_BSDFParameters>(
+            { float3(0.9, 0.6, 0.4), 0.1 },
+            { float3(0, 0, 0), 0 });
+
+        Auto_Bwd_ScatterSample.Differential dOut = { float3(0, 0, 0), 0, float3(1, 0, 0) };
+        __bwd_diff(bsdfGGXSample)(sd, dp_params, dOut);
+
+        outputBuffer[0] = dp_params.d.albedo[0];
+        outputBuffer[1] = dp_params.d.albedo[1];
+        outputBuffer[2] = dp_params.d.albedo[2];
+        outputBuffer[3] = dp_params.d.roughness;
+    }
+
+    {
+        DifferentialPair<Auto_Bwd_BSDFParameters> dp_params = DifferentialPair<Auto_Bwd_BSDFParameters>(
+            { float3(0.9, 0.6, 0.4), 0.1 },
+            { float3(0, 0, 0), 1.0 });
+        DifferentialPair<Auto_Bwd_ScatterSample> dp_result;
+        __fwd_diff(bsdfGGXSample)(sd, dp_params, dp_result);
+
+        outputBuffer[4] = dp_result.p.weight[0];
+        outputBuffer[5] = dp_result.p.weight[1];
+        outputBuffer[6] = dp_result.p.weight[2];
+        outputBuffer[7] = dp_result.d.weight[0];
+        outputBuffer[8] = dp_result.d.weight[1];
+        outputBuffer[9] = dp_result.d.weight[2];
+    }
+}