arb_tessellation_shader: test that redeclared barrier() is unrestricted

Signed-off-by: Chris Forbes <chrisf@ijw.co.nz>
Reviewed-by: Marek Olšák <marek.olsak@amd.com>

1 files changed, 44 insertions, 0 deletions

diff --git a/tests/spec/arb_tessellation_shader/compiler/barrier-redeclared.tesc b/tests/spec/arb_tessellation_shader/compiler/barrier-redeclared.tesc
new file mode 100644
index 000000000..e1ea1095b
--- /dev/null
+++ b/tests/spec/arb_tessellation_shader/compiler/barrier-redeclared.tesc
@@ -0,0 +1,44 @@
+// [config]
+// expect_result: pass
+// glsl_version: 1.50
+// require_extensions: GL_ARB_tessellation_shader
+// check_link: true
+// [end config]
+
+/**
+ * ARB_tessellation_shader imposes tight restrictions on where calls to the
+ * built-in function barrier() may appear.
+ *
+ * If the app provides its own function named 'barrier', then the usual suppression
+ * of the builtin function should apply, and the app-provided function should be
+ * freely callable in any context.
+ */
+
+#version 150
+#extension GL_ARB_tessellation_shader: require
+layout(vertices = 3) out;
+
+void barrier() {}	/* suppresses the builtin */
+
+void calls_barrier() {
+    barrier();		/* in non-main OK */
+}
+
+void main() {
+    gl_out[gl_InvocationID].gl_Position = vec4(0.0);
+
+    for (int i = 0; i < 3; i++)
+        barrier();	/* in loops OK */
+
+    calls_barrier();
+
+    gl_TessLevelOuter = float[4](1.0, 1.0, 1.0, 1.0);
+    gl_TessLevelInner = float[2](1.0, 1.0);
+
+    if (gl_in[0].gl_Position.x < 0) {
+        barrier();	/* in control flow OK */
+        return;
+    }
+
+    barrier();          /* after return OK */
+}