[Piglit] [PATCH] arb_tessellation_shader: Test unmatched TCS output usage

[Danylo Piliaiev]

Test that TCS per-vertex outputs which are used only in
TCS stage are not converted to local variables and indeed
share data within the patch.

Bugzilla: https://bugs.freedesktop.org/show_bug.cgi?id=104297
Signed-off-by: Danylo Piliaiev <danylo.piliaiev at globallogic.com>
---
 .../tcs-output-unmatched.shader_test          | 65 +++++++++++++++++++
 1 file changed, 65 insertions(+)
 create mode 100644 tests/spec/arb_tessellation_shader/execution/tcs-output-unmatched.shader_test

diff --git a/tests/spec/arb_tessellation_shader/execution/tcs-output-unmatched.shader_test b/tests/spec/arb_tessellation_shader/execution/tcs-output-unmatched.shader_test
new file mode 100644
index 000000000..de1b0143b
--- /dev/null
+++ b/tests/spec/arb_tessellation_shader/execution/tcs-output-unmatched.shader_test
@@ -0,0 +1,65 @@
+# Test that TCS per-vertex outputs which are used only in
+# TCS stage are not converted to local variables
+# and indeed share data within the patch.
+
+[require]
+GLSL >= 1.50
+GL_ARB_tessellation_shader
+GL_ARB_separate_shader_objects
+
+[vertex shader passthrough]
+
+
+[tessellation control shader]
+#extension GL_ARB_tessellation_shader: require
+#extension GL_ARB_separate_shader_objects: require
+#extension GL_ARB_shader_atomic_counters: require
+#extension GL_ARB_shader_atomic_counter_ops: require
+layout(vertices = 3) out;
+
+layout(location=0) out vec4 out_unused_in_tes[];
+
+layout(binding = 0) uniform atomic_uint mismatches;
+
+void main() {
+	out_unused_in_tes[gl_InvocationID] = gl_in[gl_InvocationID].gl_Position;
+
+	barrier();
+
+	if(out_unused_in_tes[0] != gl_in[0].gl_Position ||
+	   out_unused_in_tes[1] != gl_in[1].gl_Position ||
+	   out_unused_in_tes[2] != gl_in[2].gl_Position) {
+		atomicCounterIncrement(mismatches);
+     }
+}
+
+
+[tessellation evaluation shader]
+#extension GL_ARB_tessellation_shader: require
+layout(triangles) in;
+
+void main() {
+	gl_Position = vec4(0);
+}
+
+
+[fragment shader]
+
+void main()
+{
+	gl_FragColor = vec4(1.0);
+}
+
+[vertex data]
+piglit_vertex/float/4
+1 1 1 1
+2 2 2 2
+3 3 3 3
+
+[test]
+atomic counters 1
+
+patch parameter vertices 3
+draw arrays GL_PATCHES 0 3
+
+probe atomic counter 0 == 0
-- 
2.20.1