blob: 4e5aa218a478ced868e31be6c7398d1df6550ed8 (
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
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
|
#version 330
in vec2 texcoord; // texture coordinate of the fragment
uniform sampler2D tex; // texture of the window
ivec2 window_size = textureSize(tex, 0); // Size of the window
ivec2 window_center = ivec2(window_size.x/2, window_size.y/2);
uniform float shadow_cutoff = 1; // How "early" the shadow starts affecting
// pixels close to the edges
// I'd keep this value very close to 1
uniform int shadow_intensity = 3; // Intensity level of the shadow effect (from 1 to 5)
// Default window post-processing:
// 1) invert color
// 2) opacity / transparency
// 3) max-brightness clamping
// 4) rounded corners
vec4 default_post_processing(vec4 c);
// Darkens a pixels near the edges
vec4 calc_opacity(vec4 color, vec2 coords)
{
// If shadow intensity is 0, change nothing
if (shadow_intensity == 0)
{
return color;
}
// Get how far the coords are from the center
vec2 distances_from_center = abs(window_center - coords);
// Darken pixels close to the edges of the screen in a polynomial fashion
float opacity = 1;
opacity *= -pow((distances_from_center.y/window_center.y)*shadow_cutoff,
(5/shadow_intensity)*2)+1;
opacity *= -pow((distances_from_center.x/window_center.x)*shadow_cutoff,
(5/shadow_intensity)*2)+1;
color.w *= opacity;
color.w = max(1 - color.w, 0.8);
return color;
}
// Default window shader:
// 1) fetch the specified pixel
// 2) apply default post-processing
vec4 window_shader() {
vec4 c = texelFetch(tex, ivec2(texcoord), 0);
if (c.x +c.y + c.z < 0.6)
{
c.w = 1;
c = calc_opacity(c,texcoord);
}
return default_post_processing(c);
}
|
