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
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
|
#define COLOR_LOW 0.45
#define COLOR_HIGH 1.0
#define VERTICAL_BORDER_DEPTH 0.6
#define SCANLINE_DEPTH 0.55
#define CURVENESS 0.3
STATIC vec4 scale(sampler2D image, vec2 position, vec2 input_resolution, vec2 output_resolution)
{
/* Curve and pixel ratio */
float y_curve = cos(position.x - 0.5) * CURVENESS + (1.0 - CURVENESS);
float y_multiplier = 8.0 / 7.0 / y_curve;
position.y *= y_multiplier;
position.y -= (y_multiplier - 1.0) / 2.0;
if (position.y < 0.0) return vec4(0,0,0,0);
if (position.y > 1.0) return vec4(0,0,0,0);
float x_curve = cos(position.y - 0.5) * CURVENESS + (1.0 - CURVENESS);
float x_multiplier = 1.0/x_curve;
position.x *= x_multiplier;
position.x -= (x_multiplier - 1.0) / 2.0;
if (position.x < 0.0) return vec4(0,0,0,0);
if (position.x > 1.0) return vec4(0,0,0,0);
/* Setting up common vars */
vec2 pos = fract(position * input_resolution);
vec2 sub_pos = pos * 6.0;
vec4 center = texture_relative(image, position, vec2(0, 0));
vec4 left = texture_relative(image, position, vec2(-1, 0));
vec4 right = texture_relative(image, position, vec2(1, 0));
/* Vertical blurring */
if (sub_pos.y < 1.0) {
center = mix(center, texture_relative(image, position, vec2( 0, -1)), 0.5 - sub_pos.y / 2.0);
left = mix(left, texture_relative(image, position, vec2(-1, -1)), 0.5 - sub_pos.y / 2.0);
right = mix(right, texture_relative(image, position, vec2( 1, -1)), 0.5 - sub_pos.y / 2.0);
}
else if (sub_pos.y > 5.0) {
center = mix(center, texture_relative(image, position, vec2( 0, 1)), (sub_pos.y - 5.0) / 2.0);
left = mix(left, texture_relative(image, position, vec2(-1, 1)), (sub_pos.y - 5.0) / 2.0);
right = mix(right, texture_relative(image, position, vec2( 1, 1)), (sub_pos.y - 5.0) / 2.0);
}
/* Scanlines */
float scanline_multiplier;
if (pos.y < 0.5) {
scanline_multiplier = (pos.y * 2.0) * SCANLINE_DEPTH + (1.0 - SCANLINE_DEPTH);
}
else {
scanline_multiplier = ((1.0 - pos.y) * 2.0) * SCANLINE_DEPTH + (1.0 - SCANLINE_DEPTH);
}
center *= scanline_multiplier;
left *= scanline_multiplier;
right *= scanline_multiplier;
/* Vertical seperator for shadow masks */
bool odd = bool(int((position * input_resolution).x) & 1);
if (odd) {
pos.y += 0.5;
pos.y = fract(pos.y);
}
if (pos.y < 1.0 / 3.0) {
float gradient_position = pos.y * 3.0;
center *= gradient_position * VERTICAL_BORDER_DEPTH + (1.0 - VERTICAL_BORDER_DEPTH);
left *= gradient_position * VERTICAL_BORDER_DEPTH + (1.0 - VERTICAL_BORDER_DEPTH);
right *= gradient_position * VERTICAL_BORDER_DEPTH + (1.0 - VERTICAL_BORDER_DEPTH);
}
else if (pos.y > 2.0 / 3.0) {
float gradient_position = (1.0 - pos.y) * 3.0;
center *= gradient_position * VERTICAL_BORDER_DEPTH + (1.0 - VERTICAL_BORDER_DEPTH);
left *= gradient_position * VERTICAL_BORDER_DEPTH + (1.0 - VERTICAL_BORDER_DEPTH);
right *= gradient_position * VERTICAL_BORDER_DEPTH + (1.0 - VERTICAL_BORDER_DEPTH);
}
/* Blur the edges of the separators of adjacent columns */
if (sub_pos.x < 1.0 || sub_pos.x > 5.0) {
pos.y += 0.5;
pos.y = fract(pos.y);
if (pos.y < 1.0 / 3.0) {
float gradient_position = pos.y * 3.0;
if (pos.x < 0.5) {
gradient_position = 1.0 - (1.0 - gradient_position) * (1.0 - (pos.x) * 6.0);
}
else {
gradient_position = 1.0 - (1.0 - gradient_position) * (1.0 - (1.0 - pos.x) * 6.0);
}
center *= gradient_position * VERTICAL_BORDER_DEPTH + (1.0 - VERTICAL_BORDER_DEPTH);
left *= gradient_position * VERTICAL_BORDER_DEPTH + (1.0 - VERTICAL_BORDER_DEPTH);
right *= gradient_position * VERTICAL_BORDER_DEPTH + (1.0 - VERTICAL_BORDER_DEPTH);
}
else if (pos.y > 2.0 / 3.0) {
float gradient_position = (1.0 - pos.y) * 3.0;
if (pos.x < 0.5) {
gradient_position = 1.0 - (1.0 - gradient_position) * (1.0 - (pos.x) * 6.0);
}
else {
gradient_position = 1.0 - (1.0 - gradient_position) * (1.0 - (1.0 - pos.x) * 6.0);
}
center *= gradient_position * VERTICAL_BORDER_DEPTH + (1.0 - VERTICAL_BORDER_DEPTH);
left *= gradient_position * VERTICAL_BORDER_DEPTH + (1.0 - VERTICAL_BORDER_DEPTH);
right *= gradient_position * VERTICAL_BORDER_DEPTH + (1.0 - VERTICAL_BORDER_DEPTH);
}
}
/* Subpixel blurring, like LCD filter*/
vec4 midleft = mix(left, center, 0.5);
vec4 midright = mix(right, center, 0.5);
vec4 ret;
if (sub_pos.x < 1.0) {
ret = mix(vec4(COLOR_HIGH * center.r, COLOR_LOW * center.g, COLOR_HIGH * left.b, 1),
vec4(COLOR_HIGH * center.r, COLOR_LOW * center.g, COLOR_LOW * left.b, 1),
sub_pos.x);
}
else if (sub_pos.x < 2.0) {
ret = mix(vec4(COLOR_HIGH * center.r, COLOR_LOW * center.g, COLOR_LOW * left.b, 1),
vec4(COLOR_HIGH * center.r, COLOR_HIGH * center.g, COLOR_LOW * midleft.b, 1),
sub_pos.x - 1.0);
}
else if (sub_pos.x < 3.0) {
ret = mix(vec4(COLOR_HIGH * center.r , COLOR_HIGH * center.g, COLOR_LOW * midleft.b, 1),
vec4(COLOR_LOW * midright.r, COLOR_HIGH * center.g, COLOR_LOW * center.b, 1),
sub_pos.x - 2.0);
}
else if (sub_pos.x < 4.0) {
ret = mix(vec4(COLOR_LOW * midright.r, COLOR_HIGH * center.g , COLOR_LOW * center.b, 1),
vec4(COLOR_LOW * right.r , COLOR_HIGH * center.g, COLOR_HIGH * center.b, 1),
sub_pos.x - 3.0);
}
else if (sub_pos.x < 5.0) {
ret = mix(vec4(COLOR_LOW * right.r, COLOR_HIGH * center.g , COLOR_HIGH * center.b, 1),
vec4(COLOR_LOW * right.r, COLOR_LOW * midright.g, COLOR_HIGH * center.b, 1),
sub_pos.x - 4.0);
}
else {
ret = mix(vec4(COLOR_LOW * right.r, COLOR_LOW * midright.g, COLOR_HIGH * center.b, 1),
vec4(COLOR_HIGH * right.r, COLOR_LOW * right.g , COLOR_HIGH * center.b, 1),
sub_pos.x - 5.0);
}
/* Anti alias the curve */
vec2 pixel_position = position * output_resolution;
if (pixel_position.x < 1.0) {
ret *= pixel_position.x;
}
else if (pixel_position.x > output_resolution.x - 1.0) {
ret *= output_resolution.x - pixel_position.x;
}
if (pixel_position.y < 1.0) {
ret *= pixel_position.y;
}
else if (pixel_position.y > output_resolution.y - 1.0) {
ret *= output_resolution.y - pixel_position.y;
}
return ret;
}
|
