new file mode 100644
@@ -0,0 +1,42 @@
+# Fill the window with red, then green, then blue.
+
+[require]
+GL >= 2.0 es
+
+[vertex shader]
+#version 100
+
+attribute vec4 vertex;
+
+void main() {
+ gl_Position = vertex;
+}
+
+[fragment shader]
+#version 100
+
+uniform vec4 u_color;
+
+void main() {
+ gl_FragColor = u_color;
+}
+
+[vertex data]
+vertex/float/2
+-1.0 -1.0
+ 1.0 -1.0
+ 1.0 1.0
+-1.0 1.0
+
+[test]
+uniform vec4 u_color 1.0 0.0 0.0 1.0
+draw arrays GL_TRIANGLE_FAN 0 4
+probe all rgba 1.0 0.0 0.0 1.0
+
+uniform vec4 u_color 0.0 1.0 0.0 1.0
+draw arrays GL_TRIANGLE_FAN 0 4
+probe all rgba 0.0 1.0 0.0 1.0
+
+uniform vec4 u_color 0.0 0.0 1.0 1.0
+draw arrays GL_TRIANGLE_FAN 0 4
+probe all rgba 0.0 0.0 1.0 1.0