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+# Copyright 2019 Google LLC.
+# Copyright 2019 The Khronos Group Inc.
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+# https://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+
+[vertex shader]
+#version 430
+
+layout(location = 0) in vec4 position_in;
+layout(location = 1) in vec4 color_in;
+layout(location = 0) flat out vec4 color_out;
+
+void main() {
+ gl_Position = position_in;
+ color_out = color_in;
+}
+
+[fragment shader]
+#version 430
+
+layout(location = 0) flat in vec4 color_in;
+layout(location = 0) out vec4 color_out;
+
+void main() {
+ color_out = color_in;
+}
+
+[vertex data]
+# Provoking vertices are all red.
+0/R32G32B32_SFLOAT 1/R8G8B8A8_UNORM
+-1.0 -0.5 0.0 255 0 0 255 # line 0
+ 1.0 -0.5 0.0 0 255 0 255
+-1.0 0.5 0.0 255 0 0 255 # line 1
+ 1.0 0.5 0.0 0 255 0 255
+
+[test]
+# Clear color buffer to red and check the drawing doesn't
+# add any other colors from non-provoking vertices.
+clear color 255 0 0 255
+clear
+draw arrays LINE_LIST 0 4
+probe all rgb 1.0, 0.0, 0.0