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/*
Copyright (c) 2019 The Khronos Group Inc.
Use of this source code is governed by an MIT-style license that can be
found in the LICENSE.txt file.
*/
attribute vec4 gtf_Vertex;
uniform mat4 gtf_ModelViewProjectionMatrix;
varying vec4 color;
// Function declaration.
int function(inout int par);
void main (void)
{
int par = 1;
int ret = 0;
float gray = 0.0;
ret = function(par);
// The parameter should be changed by the function and the function should return 1.
if((par == 0) && (ret == 1))
{
gray = 1.0;
}
color = vec4(gray, gray, gray, 1.0);
gl_Position = gtf_ModelViewProjectionMatrix * gtf_Vertex;
}
// Function definition.
int function(inout int par)
{
// Return the value of the parameter.
if(par == 1)
{
// Test parameter qualifier (default is "in").
par = 0;
return 1;
}
else
return 0;
}
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