Giovanni Mascellani : tests: Check that derivatives are still computed after discarding.

[Alexandre Julliard]

Module: vkd3d
Branch: master
Commit: 7196484e5920992f8786f58acfc3b086d0a85423
URL:    https://gitlab.winehq.org/wine/vkd3d/-/commit/7196484e5920992f8786f58acfc3b0...

Author: Giovanni Mascellani <gmascellani(a)codeweavers.com>
Date:   Fri Apr 12 14:06:36 2024 +0200

tests: Check that derivatives are still computed after discarding.

---

 tests/hlsl/discard.shader_test | 24 ++++++++++++++++++++++++
 1 file changed, 24 insertions(+)

diff --git a/tests/hlsl/discard.shader_test b/tests/hlsl/discard.shader_test
index 69272b58..152a3a0d 100644
--- a/tests/hlsl/discard.shader_test
+++ b/tests/hlsl/discard.shader_test
@@ -16,6 +16,30 @@ uniform 0 float4 9 8 7 6
 todo(sm<4 | glsl) draw quad
 probe all rgba (1, 2, 3, 4)
 
+[require]
+shader model >= 3.0
+
+% Check that derivatives are still computed after discarding
+% other pixels in the same quad
+[pixel shader todo(sm<4)]
+float4 main(float4 pos : sv_position) : sv_target
+{
+    if (frac((floor(pos.x) + floor(pos.y)) / 2) == 0.5)
+        discard;
+    return float4(ddx(pos.x), ddx(pos.y), ddy(pos.x), ddy(pos.y));
+}
+
+[test]
+todo(sm<4 | glsl) draw quad
+probe (0, 0) rgba (1, 0, 0, 1)
+probe (1, 0) rgba (1, 2, 3, 4)
+probe (0, 1) rgba (1, 2, 3, 4)
+probe (1, 1) rgba (1, 0, 0, 1)
+probe (2, 0) rgba (1, 0, 0, 1)
+probe (3, 0) rgba (1, 2, 3, 4)
+probe (2, 1) rgba (1, 2, 3, 4)
+probe (3, 1) rgba (1, 0, 0, 1)
+
 [require]
 shader model >= 5.0