blob: 0fdecde16d1c81a4ec98faa5611f7df36194f0c5 (
plain)
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
|
/*
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_Color;
attribute vec4 gtf_Vertex;
uniform mat4 gtf_ModelViewProjectionMatrix;
varying vec4 color;
void main (void)
{
const float M_PI = 3.14159265358979323846;
vec3 c = 0.5 * M_PI * 2.0 * (gtf_Color.rgb - 0.5);
vec3 o;
if(abs(c.r) < 0.5) // -45..45
o.r = 0.5 * tan(c.r) + 0.5;
else // 45..90, -45..-90
o.r = 0.5 / tan(c.r) + 0.5;
if(abs(c.g) < 0.5) // -45..45
o.g = 0.5 * tan(c.g) + 0.5;
else // 45..90, -45..-90
o.g = 0.5 / tan(c.g) + 0.5;
if(abs(c.b) < 0.5) // -45..45
o.b = 0.5 * tan(c.b) + 0.5;
else // 45..90, -45..-90
o.b = 0.5 / tan(c.b) + 0.5;
color = vec4(o, 1.0);
gl_Position = gtf_ModelViewProjectionMatrix * gtf_Vertex;
}
|