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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.
*/
#ifdef GL_ES
precision mediump float;
#endif
varying vec4 color;
// Function declarations.
int function(inout int par[3]);
bool is_all(const in int array[3], const in int value);
void set_all(out int array[3], const in int value);
void main (void)
{
int par[3];
int ret = 0;
float gray = 0.0;
// Initialize the entire array to 1.
set_all(par, 1);
ret = function(par);
// The parameter should be changed by the function and the function should return 1.
if(is_all(par, 0) && (ret == 1))
{
gray = 1.0;
}
gl_FragColor = vec4(gray, gray, gray, 1.0);
}
// Function definition.
int function(inout int par[3])
{
// Return the value of the array.
if(is_all(par, 1))
{
// Test parameter qualifier (default is "in").
set_all(par, 0);
return 1;
}
else
return 0;
}
bool is_all(const in int array[3], const in int value)
{
bool ret = true;
if(array[0] != value)
ret = false;
if(array[1] != value)
ret = false;
if(array[2] != value)
ret = false;
return ret;
}
void set_all(out int array[3], const in int value)
{
array[0] = value;
array[1] = value;
array[2] = value;
}
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