From 765fe3a7cd668ad88e56ebb8e5f29c9ce99ab2ff Mon Sep 17 00:00:00 2001
From: Hans-Kristian Arntzen <maister@archlinux.us>
Date: Sat, 26 Mar 2016 18:27:36 +0100
Subject: [PATCH] Test for non-causal detection.

---
 test/feedback-noncausal.slang  | 37 ++++++++++++++++++++++++++++++++++
 test/feedback-noncausal.slangp |  5 +++++
 2 files changed, 42 insertions(+)
 create mode 100644 test/feedback-noncausal.slang
 create mode 100644 test/feedback-noncausal.slangp

diff --git a/test/feedback-noncausal.slang b/test/feedback-noncausal.slang
new file mode 100644
index 0000000..d93a2a7
--- /dev/null
+++ b/test/feedback-noncausal.slang
@@ -0,0 +1,37 @@
+#version 450
+
+layout(std140, set = 0, binding = 0) uniform UBO
+{
+   mat4 MVP;
+   vec4 SourceSize;
+   vec4 PassOutputSize0;
+} global;
+
+#pragma stage vertex
+layout(location = 0) in vec4 Position;
+layout(location = 1) in vec2 TexCoord;
+layout(location = 0) out vec2 vTexCoord;
+
+void main()
+{
+   gl_Position = global.MVP * Position;
+   vTexCoord = TexCoord;
+}
+
+#pragma stage fragment
+layout(location = 0) in vec2 vTexCoord;
+layout(location = 0) out vec4 FragColor;
+layout(set = 0, binding = 1) uniform sampler2D Source;
+
+// This should intentionally fail to validate in the frontend.
+layout(set = 0, binding = 2) uniform sampler2D PassOutput0;
+
+void main()
+{
+   vec2 tex = floor(global.PassOutputSize0.xy * vTexCoord);
+   tex = (tex + 0.5) * global.PassOutputSize0.zw;
+
+   vec3 current = texture(Source, tex).rgb;
+   vec3 prev = texture(PassOutput0, tex).rgb;
+   FragColor = vec4(mix(current, prev, 0.8), 1.0);
+}
diff --git a/test/feedback-noncausal.slangp b/test/feedback-noncausal.slangp
new file mode 100644
index 0000000..e5e99a1
--- /dev/null
+++ b/test/feedback-noncausal.slangp
@@ -0,0 +1,5 @@
+shaders = 1
+shader0 = feedback-noncausal.slang
+scale_type0 = source
+scale0 = 1.0
+filter_linear0 = false