Ethan Lee : tests: Add tests for ddx(), ddy() intrinsics.

[Alexandre Julliard]

Module: vkd3d
Branch: master
Commit: d3876e49bc8df422c0446e5fa3174b510f79364b
URL:    https://gitlab.winehq.org/wine/vkd3d/-/commit/d3876e49bc8df422c0446e5fa3174b...

Author: Ethan Lee 
Date:   Wed Apr 26 10:29:14 2023 -0400

tests: Add tests for ddx(), ddy() intrinsics.

Thanks to Giovanni for the second set of tests! Note that the
tolerance for the final pixel was set much higher than the others;
this test seems to be an issue for some devices (in my case, a 7900
XTX running RADV).

Co-authored-by: Giovanni Mascellani 
Signed-off-by: Ethan Lee

---

Makefile.am              |  1 +
 tests/ddxddy.shader_test | 26 ++++++++++++++++++++++++++
 2 files changed, 27 insertions(+)

diff --git a/Makefile.am b/Makefile.am
index 3f1ec171..8e94658d 100644
--- a/Makefile.am
+++ b/Makefile.am
@@ -63,6 +63,7 @@ vkd3d_shader_tests = \
    tests/cbuffer.shader_test \
    tests/compute.shader_test \
    tests/conditional.shader_test \
+	tests/ddxddy.shader_test \
    tests/distance.shader_test \
    tests/entry-point-semantics.shader_test \
    tests/exp.shader_test \
diff --git a/tests/ddxddy.shader_test b/tests/ddxddy.shader_test
new file mode 100644
index 00000000..6efb5ab6
--- /dev/null
+++ b/tests/ddxddy.shader_test
@@ -0,0 +1,26 @@
+[pixel shader]
+float4 main(float4 pos : sv_position) : sv_target
+{
+    return float4(ddx(pos.x), ddy(pos.y), 0, 0);
+}
+
+[test]
+draw quad
+probe all rgba (1.0, 1.0, 0.0, 0.0)
+
+[pixel shader]
+float4 main(float4 pos : sv_position) : sv_target
+{
+    pos /= 10.0;
+    float nonlinear = pos.x * pos.y - pos.x * (pos.x + 0.5);
+    return float4(nonlinear, ddx(nonlinear), ddy(nonlinear), 0.0);
+}
+
+[test]
+draw quad
+probe (10, 10) rgba (-0.524999976, -0.164999843, 0.104999900, 0.0) 8
+probe (11, 10) rgba (-0.689999819, -0.164999843, 0.104999900, 0.0) 8
+probe (10, 11) rgba (-0.420000076, -0.164999843, 0.104999900, 0.0) 8
+probe (11, 11) rgba (-0.574999928, -0.164999843, 0.104999900, 0.0) 8
+probe (12, 10) rgba (-0.874999881, -0.205000162, 0.124999881, 0.0) 8
+probe (150, 150) rgba (-7.52500916, -1.56500244, 1.50500488, 0.0) 40