[Piglit] [PATCH 09/10] arb_enhanced_layouts: add another xfb_stride overflow test

[Andres Gomez]

Additional check to address a bug in mesa in which a stride which
is a divisor of the declared offset for an overflowing varying
won't fail.

>From the GL_ARB_enhanced_layouts spec:

  " It is a compile-time or link-time error to have any *xfb_offset*
    that overflows *xfb_stride*, whether stated on declarations before
    or after the *xfb_stride*, or in different compilation units."

Cc: Timothy Arceri <tarceri at itsqueeze.com>
Signed-off-by: Andres Gomez <agomez at igalia.com>
---
 .../xfb_stride/variable-stride-overflow2.vert | 28 +++++++++++++++++++
 1 file changed, 28 insertions(+)
 create mode 100644 tests/spec/arb_enhanced_layouts/compiler/transform-feedback-layout-qualifiers/xfb_stride/variable-stride-overflow2.vert

diff --git a/tests/spec/arb_enhanced_layouts/compiler/transform-feedback-layout-qualifiers/xfb_stride/variable-stride-overflow2.vert b/tests/spec/arb_enhanced_layouts/compiler/transform-feedback-layout-qualifiers/xfb_stride/variable-stride-overflow2.vert
new file mode 100644
index 000000000..469c5e430
--- /dev/null
+++ b/tests/spec/arb_enhanced_layouts/compiler/transform-feedback-layout-qualifiers/xfb_stride/variable-stride-overflow2.vert
@@ -0,0 +1,28 @@
+// [config]
+// expect_result: fail
+// glsl_version: 1.40
+// check_link: true
+// require_extensions: GL_ARB_enhanced_layouts
+// [end config]
+//
+// Additional check to address a bug in mesa in which a stride which
+// is a divisor of the declared offset for an overflowing varying
+// won't fail.
+//
+// From the GL_ARB_enhanced_layouts spec:
+//
+//    "It is a compile-time or link-time error to have any *xfb_offset*
+//    that overflows *xfb_stride*, whether stated on declarations before or
+//    after the *xfb_stride*, or in different compilation units."
+
+#version 140
+#extension GL_ARB_enhanced_layouts: require
+
+layout(xfb_stride = 16) out vec4 var;
+layout(xfb_offset = 16) out vec4 var2;
+
+void main()
+{
+  var = vec4(1.0);
+  var2 = vec4(0.0);
+}
-- 
2.20.1