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+
+/*
+** Copyright (c) 2012 The Khronos Group Inc.
+**
+** Permission is hereby granted, free of charge, to any person obtaining a
+** copy of this software and/or associated documentation files (the
+** "Materials"), to deal in the Materials without restriction, including
+** without limitation the rights to use, copy, modify, merge, publish,
+** distribute, sublicense, and/or sell copies of the Materials, and to
+** permit persons to whom the Materials are furnished to do so, subject to
+** the following conditions:
+**
+** The above copyright notice and this permission notice shall be included
+** in all copies or substantial portions of the Materials.
+**
+** THE MATERIALS ARE PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
+** EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
+** MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
+** IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY
+** CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT,
+** TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE
+** MATERIALS OR THE USE OR OTHER DEALINGS IN THE MATERIALS.
+*/
+
+
+#ifdef GL_ES
+precision mediump float;
+#endif
+varying vec4 color;
+
+// Function declaration.
+bool function(inout bool par);
+
+void main (void)
+{
+ bool par = true;
+ bool ret = false;
+
+ float gray = 0.0;
+
+ ret = function(par);
+
+ // The parameter should be changed by the function and the function should return true.
+ if(!par && ret)
+ {
+ gray = 1.0;
+ }
+
+ gl_FragColor = vec4(gray, gray, gray, 1.0);
+}
+
+// Function definition.
+bool function(inout bool par)
+{
+ // Return the value of the parameter.
+ if(par)
+ {
+ // Test parameter qualifier (default is "in").
+ par = false;
+
+ return true;
+ }
+ else
+ return false;
+}