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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 declarations.
bvec4 function(out bvec4 par[3]);
bool is_all(const in bvec4 par, const in bool value);
bool is_all(const in bvec4 array[3], const in bvec4 value);
void set_all(out bvec4 array[3], const in bvec4 value);
void main (void)
{
bvec4 par[3];
bvec4 ret = bvec4(false, false, false, false);
float gray = 0.0;
// Initialize the entire array to true.
set_all(par, bvec4(true, true, true, true));
ret = function(par);
// The parameter should be changed by the function and the function should return true.
if(is_all(par, bvec4(false, false, false, false)) && is_all(ret, true))
{
gray = 1.0;
}
color = vec4(gray, gray, gray, 1.0);
gl_Position = gtf_ModelViewProjectionMatrix * gtf_Vertex;
}
// Function definitions.
bvec4 function(out bvec4 par[3])
{
// Test parameter qualifier (default is "in").
set_all(par, bvec4(false, false, false, false));
return bvec4(true, true, true, true);
}
bool is_all(const in bvec4 par, const in bool 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;
}
bool is_all(const in bvec4 array[3], const in bvec4 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 bvec4 array[3], const in bvec4 value)
{
array[0] = value;
array[1] = value;
array[2] = value;
}
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