forked from LukasBanana/LLGL
-
Notifications
You must be signed in to change notification settings - Fork 0
/
Blur.frag
47 lines (37 loc) · 1.43 KB
/
Blur.frag
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
// GLSL blur fragment shader
#version 140
#ifdef GL_ES
precision mediump float;
#endif
layout(std140) uniform BlurSettings
{
vec2 blurShift;
};
uniform sampler2D glossMap;
in vec2 vTexCoord;
out vec4 fragColor;
// Static values for the 1-dimensional gaussian kernel (sigma = 2.2, size = 11)
// see http://dev.theomader.com/gaussian-kernel-calculator/
#define GAUSSIAN_KERNEL_1 0.014374
#define GAUSSIAN_KERNEL_2 0.035855
#define GAUSSIAN_KERNEL_3 0.072994
#define GAUSSIAN_KERNEL_4 0.121281
#define GAUSSIAN_KERNEL_5 0.164472
#define GAUSSIAN_KERNEL_6 0.182049
void main()
{
// Accumulate the samples with the gaussian kernel
vec4 c = vec4(0);
c += texture(glossMap, vTexCoord - blurShift*5.0) * GAUSSIAN_KERNEL_1;
c += texture(glossMap, vTexCoord - blurShift*4.0) * GAUSSIAN_KERNEL_2;
c += texture(glossMap, vTexCoord - blurShift*3.0) * GAUSSIAN_KERNEL_3;
c += texture(glossMap, vTexCoord - blurShift*2.0) * GAUSSIAN_KERNEL_4;
c += texture(glossMap, vTexCoord - blurShift ) * GAUSSIAN_KERNEL_5;
c += texture(glossMap, vTexCoord ) * GAUSSIAN_KERNEL_6;
c += texture(glossMap, vTexCoord + blurShift ) * GAUSSIAN_KERNEL_5;
c += texture(glossMap, vTexCoord + blurShift*2.0) * GAUSSIAN_KERNEL_4;
c += texture(glossMap, vTexCoord + blurShift*3.0) * GAUSSIAN_KERNEL_3;
c += texture(glossMap, vTexCoord + blurShift*4.0) * GAUSSIAN_KERNEL_2;
c += texture(glossMap, vTexCoord + blurShift*5.0) * GAUSSIAN_KERNEL_1;
fragColor = c;
}