1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
|
/*
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.
vec4 function(vec4 par[3]);
bool is_all(const in vec4 par, const in float value);
bool is_all(const in vec4 array[3], const in vec4 value);
void set_all(out vec4 array[3], const in vec4 value);
void main (void)
{
vec4 par[3];
vec4 ret = vec4(0.0, 0.0, 0.0, 0.0);
float gray = 0.0;
// Initialize the entire array to 1.0.
set_all(par, vec4(1.0, 1.0, 1.0, 1.0));
ret = function(par);
// The parameter should remain unchanged by the function and the function should return 1.0.
if(is_all(par, vec4(1.0, 1.0, 1.0, 1.0)) && is_all(ret, 1.0))
{
gray = 1.0;
}
color = vec4(gray, gray, gray, 1.0);
gl_Position = gtf_ModelViewProjectionMatrix * gtf_Vertex;
}
// Function definitions.
vec4 function(vec4 par[3])
{
// Return the value of the array.
if(is_all(par, vec4(1.0, 1.0, 1.0, 1.0)))
{
// Test parameter qualifier (default is "in").
set_all(par, vec4(0.0, 0.0, 0.0, 0.0));
return vec4(1.0, 1.0, 1.0, 1.0);
}
else
return vec4(0.0, 0.0, 0.0, 0.0);
}
bool is_all(const in vec4 par, const in float 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 vec4 array[3], const in vec4 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 vec4 array[3], const in vec4 value)
{
array[0] = value;
array[1] = value;
array[2] = value;
}
|
