-
Notifications
You must be signed in to change notification settings - Fork 0
/
adaptive-sharpen.glsl
246 lines (197 loc) · 11 KB
/
adaptive-sharpen.glsl
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
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
// Copyright (c) 2015-2018, bacondither
// All rights reserved.
//
// Redistribution and use in source and binary forms, with or without
// modification, are permitted provided that the following conditions
// are met:
// 1. Redistributions of source code must retain the above copyright
// notice, this list of conditions and the following disclaimer
// in this position and unchanged.
// 2. Redistributions in binary form must reproduce the above copyright
// notice, this list of conditions and the following disclaimer in the
// documentation and/or other materials provided with the distribution.
//
// THIS SOFTWARE IS PROVIDED BY THE AUTHORS ``AS IS'' AND ANY EXPRESS OR
// IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
// OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
// IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
// INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
// NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
// THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
// Adaptive sharpen - version 2018-04-14 - (requires ps >= 3.0)
// Tuned for use post resize
//!HOOK SCALED
//!BIND HOOKED
//!SAVE ASSD
//!COMPONENTS 2
//!DESC adaptive-sharpen
//--------------------------------------- Settings ------------------------------------------------
#define curve_height 1.3 // Main control of sharpening strength [>0]
// 0.3 <-> 2.0 is a reasonable range of values
// Defined values under this row are "optimal" DO NOT CHANGE IF YOU DO NOT KNOW WHAT YOU ARE DOING!
#define curveslope 0.5 // Sharpening curve slope, high edge values
#define L_overshoot 0.003 // Max light overshoot before compression [>0.001]
#define L_compr_low 0.167 // Light compression, default (0.169=~9x)
#define L_compr_high 0.334 // Light compression, surrounded by edges (0.337=~4x)
#define D_overshoot 0.009 // Max dark overshoot before compression [>0.001]
#define D_compr_low 0.250 // Dark compression, default (0.253=~6x)
#define D_compr_high 0.500 // Dark compression, surrounded by edges (0.504=~2.5x)
#define scale_lim 0.1 // Abs max change before compression (0.1=+-10%)
#define scale_cs 0.056 // Compression slope above scale_lim
#define pm_p sat(1.0/curve_height) // Power mean p-value [>0-1.0]
//-------------------------------------------------------------------------------------------------
// Soft limit
#define soft_lim(v,s) ( (exp(2.0*min(abs(v), s*24.0)/s) - 1.0)/(exp(2.0*min(abs(v), s*24.0)/s) + 1.0)*s )
// Weighted power mean
#define wpmean(a,b,c) ( pow((c*pow(abs(a), pm_p) + (1.0-c)*pow(b, pm_p)), (1.0/pm_p)) )
// Get destination pixel values
#define get(x,y) ( HOOKED_texOff(vec2(x, y)).rgb )
#define sat(x) ( clamp(x, 0.0, 1.0) )
// Colour to luma, fast approx gamma, avg of rec. 709 & 601 luma coeffs
#define CtL(RGB) ( sqrt(dot(vec3(0.2558, 0.6511, 0.0931), pow(sat(RGB), vec3(2.0)))) )
// Center pixel diff
#define mdiff(a,b,c,d,e,f,g) ( abs(luma[g]-luma[a]) + abs(luma[g]-luma[b]) \
+ abs(luma[g]-luma[c]) + abs(luma[g]-luma[d]) \
+ 0.5*(abs(luma[g]-luma[e]) + abs(luma[g]-luma[f])) )
#define b_diff(pix) ( abs(blur-c[pix]) )
vec4 hook() {
vec4 o = HOOKED_tex(HOOKED_pos);
// Get points, saturate colour data in c[0]
// [ c22 ]
// [ c24, c9, c23 ]
// [ c21, c1, c2, c3, c18 ]
// [ c19, c10, c4, c0, c5, c11, c16 ]
// [ c20, c6, c7, c8, c17 ]
// [ c15, c12, c14 ]
// [ c13 ]
vec3 c[25] = vec3[](sat(o.rgb), get(-1,-1), get( 0,-1), get( 1,-1), get(-1, 0),
get( 1, 0), get(-1, 1), get( 0, 1), get( 1, 1), get( 0,-2),
get(-2, 0), get( 2, 0), get( 0, 2), get( 0, 3), get( 1, 2),
get(-1, 2), get( 3, 0), get( 2, 1), get( 2,-1), get(-3, 0),
get(-2, 1), get(-2,-1), get( 0,-3), get( 1,-2), get(-1,-2));
// Blur, gauss 3x3
vec3 blur = (2.0 * (c[2]+c[4]+c[5]+c[7]) + (c[1]+c[3]+c[6]+c[8]) + 4.0 * c[0]) / 16.0;
// Contrast compression, center = 0.5, scaled to 1/3
float c_comp = sat(0.266666681f + 0.9*exp2(dot(blur, vec3(-7.4/3.0))));
// Edge detection
// Relative matrix weights
// [ 1 ]
// [ 4, 5, 4 ]
// [ 1, 5, 6, 5, 1 ]
// [ 4, 5, 4 ]
// [ 1 ]
float edge = length( 1.38*b_diff(0)
+ 1.15*(b_diff(2) + b_diff(4) + b_diff(5) + b_diff(7))
+ 0.92*(b_diff(1) + b_diff(3) + b_diff(6) + b_diff(8))
+ 0.23*(b_diff(9) + b_diff(10) + b_diff(11) + b_diff(12)) ) * c_comp;
// RGB to luma
float c0_Y = CtL(c[0]);
float luma[25] = float[](c0_Y, CtL(c[1]), CtL(c[2]), CtL(c[3]), CtL(c[4]), CtL(c[5]), CtL(c[6]),
CtL(c[7]), CtL(c[8]), CtL(c[9]), CtL(c[10]), CtL(c[11]), CtL(c[12]),
CtL(c[13]), CtL(c[14]), CtL(c[15]), CtL(c[16]), CtL(c[17]), CtL(c[18]),
CtL(c[19]), CtL(c[20]), CtL(c[21]), CtL(c[22]), CtL(c[23]), CtL(c[24]));
// Precalculated default squared kernel weights
const vec3 w1 = vec3(0.5, 1.0, 1.41421356237); // 0.25, 1.0, 2.0
const vec3 w2 = vec3(0.86602540378, 1.0, 0.54772255751); // 0.75, 1.0, 0.3
// Transition to a concave kernel if the center edge val is above thr
vec3 dW = pow(mix( w1, w2, smoothstep( 0.3, 0.8, edge)), vec3(2.0));
float mdiff_c0 = 0.02 + 3.0*( abs(luma[0]-luma[2]) + abs(luma[0]-luma[4])
+ abs(luma[0]-luma[5]) + abs(luma[0]-luma[7])
+ 0.25*(abs(luma[0]-luma[1]) + abs(luma[0]-luma[3])
+abs(luma[0]-luma[6]) + abs(luma[0]-luma[8])) );
// Use lower weights for pixels in a more active area relative to center pixel area
// This results in narrower and less visible overshoots around sharp edges
float weights[12] = float[](( min((mdiff_c0/mdiff(24, 21, 2, 4, 9, 10, 1)), dW.y) ),
( dW.x ),
( min((mdiff_c0/mdiff(23, 18, 5, 2, 9, 11, 3)), dW.y) ),
( dW.x ),
( dW.x ),
( min((mdiff_c0/mdiff(4, 20, 15, 7, 10, 12, 6)), dW.y) ),
( dW.x ),
( min((mdiff_c0/mdiff(5, 7, 17, 14, 12, 11, 8)), dW.y) ),
( min((mdiff_c0/mdiff(2, 24, 23, 22, 1, 3, 9)), dW.z) ),
( min((mdiff_c0/mdiff(20, 19, 21, 4, 1, 6, 10)), dW.z) ),
( min((mdiff_c0/mdiff(17, 5, 18, 16, 3, 8, 11)), dW.z) ),
( min((mdiff_c0/mdiff(13, 15, 7, 14, 6, 8, 12)), dW.z) ));
weights[0] = (max(max((weights[8] + weights[9])/4.0, weights[0]), 0.25) + weights[0])/2.0;
weights[2] = (max(max((weights[8] + weights[10])/4.0, weights[2]), 0.25) + weights[2])/2.0;
weights[5] = (max(max((weights[9] + weights[11])/4.0, weights[5]), 0.25) + weights[5])/2.0;
weights[7] = (max(max((weights[10] + weights[11])/4.0, weights[7]), 0.25) + weights[7])/2.0;
// Calculate the negative part of the laplace kernel
float weightsum = 0.0;
float neg_laplace = 0.0;
for (int pix = 0; pix < 12; ++pix)
{
neg_laplace += luma[pix+1]*weights[pix];
weightsum += weights[pix];
}
neg_laplace = neg_laplace / weightsum;
// Compute sharpening magnitude function
float sharpen_val = (curve_height/(curve_height*curveslope*pow((edge), 3.5) + 0.625));
// Calculate sharpening diff and scale
float sharpdiff = (c0_Y - neg_laplace)*(sharpen_val + 0.01);
// Calculate local near min & max, partial sort
float temp;
for (int i1 = 0; i1 < 24; i1 += 2)
{
temp = luma[i1];
luma[i1] = min(luma[i1], luma[i1+1]);
luma[i1+1] = max(temp, luma[i1+1]);
}
for (int i2 = 24; i2 > 0; i2 -= 2)
{
temp = luma[0];
luma[0] = min(luma[0], luma[i2]);
luma[i2] = max(temp, luma[i2]);
temp = luma[24];
luma[24] = max(luma[24], luma[i2-1]);
luma[i2-1] = min(temp, luma[i2-1]);
}
for (int i1 = 1; i1 < 24-1; i1 += 2)
{
temp = luma[i1];
luma[i1] = min(luma[i1], luma[i1+1]);
luma[i1+1] = max(temp, luma[i1+1]);
}
for (int i2 = 24-1; i2 > 1; i2 -= 2)
{
temp = luma[1];
luma[1] = min(luma[1], luma[i2]);
luma[i2] = max(temp, luma[i2]);
temp = luma[24-1];
luma[24-1] = max(luma[24-1], luma[i2-1]);
luma[i2-1] = min(temp, luma[i2-1]);
}
float nmax = (max(luma[23], c0_Y)*3.0 + luma[24])/4.0;
float nmin = (min(luma[1], c0_Y)*3.0 + luma[0])/4.0;
// Calculate tanh scale factors
float min_dist = min(abs(nmax - c0_Y), abs(c0_Y - nmin));
float pos_scale = min_dist + min(L_overshoot, 1.0001 - min_dist - c0_Y);
float neg_scale = min_dist + min(D_overshoot, 0.0001 + c0_Y - min_dist);
pos_scale = min(pos_scale, scale_lim*(1.0 - scale_cs) + pos_scale*scale_cs);
neg_scale = min(neg_scale, scale_lim*(1.0 - scale_cs) + neg_scale*scale_cs);
// Soft limited anti-ringing with tanh, wpmean to control compression slope
sharpdiff = wpmean(max(sharpdiff, 0.0), soft_lim( max(sharpdiff, 0.0), pos_scale ), L_compr_low )
- wpmean(min(sharpdiff, 0.0), soft_lim( min(sharpdiff, 0.0), neg_scale ), D_compr_low );
return vec4(sharpdiff, c0_Y, 0, 1);
}
//!HOOK SCALED
//!BIND HOOKED
//!BIND ASSD
//!DESC adaptive-sharpen equalization
#define video_level_out false // True to preserve BTB & WTW (minor summation error)
// Normally it should be set to false
#define SD(x,y) ASSD_texOff(vec2(x,y)).r
vec4 hook() {
vec4 o = HOOKED_texOff(0);
float sharpdiff = SD( 0, 0) - 0.6 * 0.25 * (SD(-0.5,-0.5) + SD( 0.5,-0.5) + SD(-0.5, 0.5) + SD( 0.5, 0.5));
float c0_Y = ASSD_texOff(vec2(0)).g;
float sharpdiff_lim = clamp(c0_Y + sharpdiff, 0.0, 1.0) - c0_Y;
float satmul = (c0_Y + max(sharpdiff_lim*0.9, sharpdiff_lim)*1.03 + 0.03)/(c0_Y + 0.03);
vec3 res = c0_Y + (sharpdiff_lim*3 + sharpdiff)/4 + (clamp(o.rgb, 0.0, 1.0) - c0_Y)*satmul;
o.rgb = video_level_out == true ? res + o.rgb - clamp(o.rgb, 0.0, 1.0) : res;
return o;
}