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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 declaration.
ivec4 function(ivec4 par);
bool is_all(const in ivec4 par, const in int value);
void set_all(out ivec4 par, const in int value);
void main (void)
{
ivec4 par = ivec4(1, 1, 1, 1);
ivec4 ret = ivec4(0, 0, 0, 0);
float gray = 0.0;
ret = function(par);
// The parameter should remain unchanged by the function and the function should return 1.
if(is_all(par, 1) && is_all(ret, 1))
{
gray = 1.0;
}
gl_FragColor = vec4(gray, gray, gray, 1.0);
}
// Function definition.
ivec4 function(ivec4 par)
{
// Return the value of the parameter.
if(is_all(par, 1))
{
// Test parameter qualifier (default is "in").
set_all(par, 0);
return ivec4(1, 1, 1, 1);
}
else
return ivec4(0, 0, 0, 0);
}
bool is_all(const in ivec4 par, const in int value)
{
bool ret = true;
if(par[0] != value)
ret = false;
if(par[1] != value)
ret = false;
if(par[2] != value)
ret = false;
if(par[3] != value)
ret = false;
return ret;
}
void set_all(out ivec4 par, const in int value)
{
par[0] = value;
par[1] = value;
par[2] = value;
par[3] = value;
}
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