From 568776bbf6f4b391b70ad4ae18f24c6fce358468 Mon Sep 17 00:00:00 2001
From: Elizabeth Figura <zfigura@codeweavers.com>
Date: Mon, 28 Oct 2024 10:37:52 -0500
Subject: [PATCH] tests: Add a test for uninitialized varyings.

---
 Makefile.am                                   |  1 +
 tests/hlsl/uninitialized-varyings.shader_test | 46 +++++++++++++++++++
 2 files changed, 47 insertions(+)
 create mode 100644 tests/hlsl/uninitialized-varyings.shader_test

diff --git a/Makefile.am b/Makefile.am
index ff42613d..88aa8d65 100644
--- a/Makefile.am
+++ b/Makefile.am
@@ -268,6 +268,7 @@ vkd3d_shader_tests = \
 	tests/hlsl/unbounded-array-5.1.shader_test \
 	tests/hlsl/uniform-parameters.shader_test \
 	tests/hlsl/uniform-semantics.shader_test \
+	tests/hlsl/uninitialized-varyings.shader_test \
 	tests/hlsl/unorm-snorm.shader_test \
 	tests/hlsl/unroll.shader_test \
 	tests/hlsl/unsigned.shader_test \
diff --git a/tests/hlsl/uninitialized-varyings.shader_test b/tests/hlsl/uninitialized-varyings.shader_test
new file mode 100644
index 00000000..6d4d1b0b
--- /dev/null
+++ b/tests/hlsl/uninitialized-varyings.shader_test
@@ -0,0 +1,46 @@
+% Uninitialized varyings behave generally quite different across different
+% drivers. This test is limited to what is more or less consistent.
+
+[require]
+shader model < 4.0
+
+[pixel shader]
+% The alpha channel is not consistent here.
+float4 main(float4 v : texcoord0) : sv_target
+{
+    return float4(v.xyz, 1);
+}
+
+[test]
+clear rtv 0  1 0 0 1
+todo draw quad
+probe (0, 0) rgba (0, 0, 0, 1)
+
+
+[pixel shader]
+float4 main(float2 v : texcoord3, float3 w : texcoord1) : sv_target
+{
+    return float4(v.xy, w.yz);
+}
+
+[test]
+clear rtv 0  1 0 0 1
+todo draw quad
+probe (0, 0) rgba (0, 0, 0, 0)
+
+
+[require]
+% 2.0 consistently yields white. 3.0 has no consistent results.
+% color1 also has no consistent results in 2.0 or 3.0.
+shader model < 3.0
+
+[pixel shader]
+float4 main(float4 v : color0) : sv_target
+{
+    return v;
+}
+
+[test]
+clear rtv 0  1 0 0 1
+todo draw quad
+probe (0, 0) rgba (1, 1, 1, 1)