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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;
const mat4 mat_ones = mat4(1.0, 1.0, 1.0, 1.0,
1.0, 1.0, 1.0, 1.0,
1.0, 1.0, 1.0, 1.0,
1.0, 1.0, 1.0, 1.0);
const mat4 mat_zeros = mat4(0.0, 0.0, 0.0, 0.0,
0.0, 0.0, 0.0, 0.0,
0.0, 0.0, 0.0, 0.0,
0.0, 0.0, 0.0, 0.0);
// Function declarations.
mat4 function(out mat4 par[2]);
bool is_all(const in mat4 par, const in float value);
bool is_all(const in mat4 array[2], const in mat4 value);
void set_all(out mat4 array[2], const in mat4 value);
void main (void)
{
mat4 par[2];
mat4 ret = mat_zeros;
float gray = 0.0;
// Initialize the entire array to 1.0.
set_all(par, mat_ones);
ret = function(par);
// The parameter should be changed by the function and the function should return 1.0.
if(is_all(par, mat_zeros) && is_all(ret, 1.0))
{
gray = 1.0;
}
color = vec4(gray, gray, gray, 1.0);
gl_Position = gtf_ModelViewProjectionMatrix * gtf_Vertex;
}
// Function definitions.
mat4 function(out mat4 par[2])
{
// Test parameter qualifier (default is "in").
set_all(par, mat_zeros);
return mat_ones;
}
bool is_all(const in mat4 par, const in float value)
{
bool ret = true;
if(par[0][0] != value)
ret = false;
if(par[0][1] != value)
ret = false;
if(par[0][2] != value)
ret = false;
if(par[0][3] != value)
ret = false;
if(par[1][0] != value)
ret = false;
if(par[1][1] != value)
ret = false;
if(par[1][2] != value)
ret = false;
if(par[1][3] != value)
ret = false;
if(par[2][0] != value)
ret = false;
if(par[2][1] != value)
ret = false;
if(par[2][2] != value)
ret = false;
if(par[2][3] != value)
ret = false;
if(par[3][0] != value)
ret = false;
if(par[3][1] != value)
ret = false;
if(par[3][2] != value)
ret = false;
if(par[3][3] != value)
ret = false;
return ret;
}
bool is_all(const in mat4 array[2], const in mat4 value)
{
bool ret = true;
if(array[0] != value)
ret = false;
if(array[1] != value)
ret = false;
return ret;
}
void set_all(out mat4 array[2], const in mat4 value)
{
array[0] = value;
array[1] = value;
}
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