Added support for differentiating calls to basic functions, as well as arithmetic on the float3 type (#2313)

* Added support for differentiating calls to basic functions, as well as arithmetic on the float3 type

* Added test expected result

7 files changed, 99 insertions, 0 deletions

diff --git a/tests/autodiff/redecl-custom-jvp.slang b/tests/autodiff/local-redecl-custom-jvp.slang
index 2bc7cd582..2bc7cd582 100644
--- a/tests/autodiff/redecl-custom-jvp.slang
+++ b/tests/autodiff/local-redecl-custom-jvp.slang
diff --git a/tests/autodiff/redecl-custom-jvp.slang.expected.txt b/tests/autodiff/local-redecl-custom-jvp.slang.expected.txt
index 965f2cb48..965f2cb48 100644
--- a/tests/autodiff/redecl-custom-jvp.slang.expected.txt
+++ b/tests/autodiff/local-redecl-custom-jvp.slang.expected.txt
diff --git a/tests/autodiff/nested-jvp.slang b/tests/autodiff/nested-jvp.slang
new file mode 100644
index 000000000..c37641c91
--- /dev/null
+++ b/tests/autodiff/nested-jvp.slang
@@ -0,0 +1,54 @@
+//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], stride=4):out,name=outputBuffer
+RWStructuredBuffer<float> outputBuffer;
+
+[__custom_jvp(pow_jvp)]
+float pow_(float x, float n)
+{
+    return pow<float>(x, n);
+}
+
+
+[__custom_jvp(max_jvp)]
+float max_(float x, float y)
+{
+    return max<float>(x, y);
+}
+
+
+float pow_jvp(float x, float n, float dx, float dn)
+{
+    return dx * n * pow(x, n-1) + dn * pow(x, n) * log(x);
+}
+
+
+float max_jvp(float x, float y, float dx, float dy)
+{
+    return (x > y) ? dx : dy;
+}
+
+
+/* Fresnel Schlick example */
+__differentiate_jvp float3 fresnel(float3 f0, float3 f90, float cosTheta)
+{
+    return f0 + (f90 - f0) * pow_(max_(1 - cosTheta, 0.0), 5);
+}
+
+
+[numthreads(1, 1, 1)]
+void computeMain(uint3 dispatchThreadID : SV_DispatchThreadID)
+{
+     {
+        float3 f0 = float3(0.2, 0.2, 0.2);
+        float3 f90 = float3(0.7, 0.7, 0.7);
+        float cosTheta = 0.5;
+
+        float3 d_f0 = float3(0.1, 0.1, 0.1);
+        float3 d_f90 = float3(0.9, 0.9, 0.9);
+        float d_cosTheta = 1.0;
+
+        outputBuffer[0] = __jvp(fresnel)(f0, f90, cosTheta, d_f0, d_f90, d_cosTheta).y; // Expect: -0.031250
+    }
+}
diff --git a/tests/autodiff/nested-jvp.slang.expected.txt b/tests/autodiff/nested-jvp.slang.expected.txt
new file mode 100644
index 000000000..107153351
--- /dev/null
+++ b/tests/autodiff/nested-jvp.slang.expected.txt
@@ -0,0 +1,5 @@
+type: float
+-0.031250
+0.0
+0.0
+0.0
\ No newline at end of file
diff --git a/tests/autodiff/test-intrinsics.slang b/tests/autodiff/test-intrinsics.slang
index 3fa53e85a..189004543 100644
--- a/tests/autodiff/test-intrinsics.slang
+++ b/tests/autodiff/test-intrinsics.slang
@@ -4,3 +4,8 @@ float pow_(float x, float n)
 {
     return pow(x, n);
 }
+
+float max_(float x, float y)
+{
+    return max(x, y);
+}
\ No newline at end of file
diff --git a/tests/autodiff/vector-arithmetic-jvp.slang b/tests/autodiff/vector-arithmetic-jvp.slang
new file mode 100644
index 000000000..5852b49a7
--- /dev/null
+++ b/tests/autodiff/vector-arithmetic-jvp.slang
@@ -0,0 +1,30 @@
+//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], stride=4):out,name=outputBuffer
+RWStructuredBuffer<float> outputBuffer;
+
+__differentiate_jvp float3 f(float3 x)
+{
+    return x;
+}
+
+__differentiate_jvp float3 g(float3 x, float3 y)
+{
+    float3 a = x + y;
+    float3 b = x - y;
+    return a * b + 2 * x * y;
+}
+
+[numthreads(1, 1, 1)]
+void computeMain(uint3 dispatchThreadID : SV_DispatchThreadID)
+{
+     {
+        float3 a = float3(2.0, 2.0, 2.0);
+        float3 b = float3(1.5, 1.5, 1.5);
+        float3 da = float3(1.0, 1.0, 1.0);
+
+        outputBuffer[0] = __jvp(f)(a, da).z;                          // Expect: 1
+        outputBuffer[1] = __jvp(g)(a, b, da, float3(2.0, 1.0, 0.0)).y;       // Expect: 8
+    }
+}
diff --git a/tests/autodiff/vector-arithmetic-jvp.slang.expected.txt b/tests/autodiff/vector-arithmetic-jvp.slang.expected.txt
new file mode 100644
index 000000000..adbb9a448
--- /dev/null
+++ b/tests/autodiff/vector-arithmetic-jvp.slang.expected.txt
@@ -0,0 +1,5 @@
+type: float
+1.0
+8.0
+0.0
+0.0
\ No newline at end of file