ProjectArcade

1
// Natural Vision Shader, modified to use in PPSSPP.
2

3
// by ShadX (Modded by SimoneT)
4
// http://forums.ngemu.com/showthread.php?t=76098
5

6
#ifdef GL_ES
7
precision mediump float;
8
precision mediump int;
9
#endif
10

11
uniform sampler2D sampler0;
12
varying vec4 v_texcoord0;
13
varying vec4 v_texcoord1;
14
varying vec4 v_texcoord2;
15
varying vec4 v_texcoord3;
16

17
const mat3 RGBtoYIQ = mat3(0.299, 0.596, 0.212, 
18
                           0.587,-0.275,-0.523, 
19
                           0.114,-0.321, 0.311);
20

21
const mat3 YIQtoRGB = mat3(1.0, 1.0, 1.0,
22
                           0.95568806036115671171,-0.27158179694405859326,-1.1081773266826619523,
23
                           0.61985809445637075388,-0.64687381613840131330, 1.7050645599191817149);
24

25
const vec3 val00 = vec3( 1.2, 1.2, 1.2);
26

27
void main()
28
{
29
vec3 c0,c1;
30

31
c0 = texture2D(sampler0,v_texcoord0.xy).xyz;
32
c0+=(texture2D(sampler0,v_texcoord0.zy).xyz)*0.25;
33
c0+=(texture2D(sampler0,v_texcoord0.xw).xyz)*0.25;
34
c0+=(texture2D(sampler0,v_texcoord0.zw).xyz)*0.125;
35

36
c0+= texture2D(sampler0,v_texcoord1.xy).xyz;
37
c0+=(texture2D(sampler0,v_texcoord1.zy).xyz)*0.25;
38
c0+=(texture2D(sampler0,v_texcoord1.xw).xyz)*0.25;
39
c0+=(texture2D(sampler0,v_texcoord1.zw).xyz)*0.125;
40

41
c0+= texture2D(sampler0,v_texcoord2.xy).xyz;
42
c0+=(texture2D(sampler0,v_texcoord2.zy).xyz)*0.25;
43
c0+=(texture2D(sampler0,v_texcoord2.xw).xyz)*0.25;
44
c0+=(texture2D(sampler0,v_texcoord2.zw).xyz)*0.125;
45

46
c0+= texture2D(sampler0,v_texcoord3.xy).xyz;
47
c0+=(texture2D(sampler0,v_texcoord3.zy).xyz)*0.25;
48
c0+=(texture2D(sampler0,v_texcoord3.xw).xyz)*0.25;
49
c0+=(texture2D(sampler0,v_texcoord3.zw).xyz)*0.125;
50
c0*=0.153846153846;
51

52
c1=RGBtoYIQ*c0;
53

54
c1=vec3(pow(c1.x,val00.x),c1.yz*val00.yz);
55

56
gl_FragColor.rgb=YIQtoRGB*c1;
57
gl_FragColor.a = 1.0;
58
}
59