From 44ab0952f0321e2a3b988cc9b3f502c7ab440e5a Mon Sep 17 00:00:00 2001
From: winmad <winmad.wlf@gmail.com>
Date: Wed, 22 Mar 2023 22:04:28 -0700
Subject: Create a simplified Falcor material system in slang test (#2721)

* Duplicate an example of differentiating Falcor's material system

* Add a second BSDF

* WIP: update test; grad didn't pass through

* Finalize test

---------

Co-authored-by: Lifan Wu <lifanw@nvidia.com>
---
 .../material/DiffuseMaterialInstance.slang         | 26 ++++++++++++++++++++++
 1 file changed, 26 insertions(+)
 create mode 100644 tests/autodiff/material/DiffuseMaterialInstance.slang

(limited to 'tests/autodiff/material/DiffuseMaterialInstance.slang')

diff --git a/tests/autodiff/material/DiffuseMaterialInstance.slang b/tests/autodiff/material/DiffuseMaterialInstance.slang
new file mode 100644
index 000000000..ca6bfc69a
--- /dev/null
+++ b/tests/autodiff/material/DiffuseMaterialInstance.slang
@@ -0,0 +1,26 @@
+//TEST_IGNORE_FILE:
+
+__exported import IMaterialInstance;
+__exported import IBSDF;
+
+struct DiffuseBSDF : IBSDF
+{
+    float3 albedo;
+
+    [TreatAsDifferentiable]
+    float3 eval(const float3 wiLocal, const float3 woLocal)
+    {
+        return albedo;
+    }
+};
+
+struct DiffuseMaterialInstance : IMaterialInstance
+{
+    DiffuseBSDF bsdf;
+
+    [TreatAsDifferentiable]
+    float3 eval(const float3 wi, const float3 wo)
+    {
+        return bsdf.eval(wi, wo);
+    }
+};
-- 
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