ProjectArcade
275 строк · 14.7 Кб
1// 4xBRZ shader - Copyright (C) 2014-2016 DeSmuME team (GPL2+)
2// Hyllians xBR-vertex code and texel mapping
3// Copyright (C) 2011/2016 Hyllian - sergiogdb@gmail.com
4#define BLEND_ALPHA 1
5#define BLEND_NONE 0
6#define BLEND_NORMAL 1
7#define BLEND_DOMINANT 2
8#define LUMINANCE_WEIGHT 1.0
9#define EQUAL_COLOR_TOLERANCE 30.0/255.0
10#define STEEP_DIRECTION_THRESHOLD 2.2
11#define DOMINANT_DIRECTION_THRESHOLD 3.6
12
13// TODO: Replace this with something cheaper.
14float DistYCbCr(vec4 pixA, vec4 pixB) {
15// https://en.wikipedia.org/wiki/YCbCr#ITU-R_BT.2020_conversion
16const vec3 K = vec3(0.2627, 0.6780, 0.0593);
17const mat3 MATRIX = mat3(K,
18-.5 * K.r / (1.0 - K.b), -.5 * K.g / (1.0 - K.b), .5,
19.5, -.5 * K.g / (1.0 - K.r), -.5 * K.b / (1.0 - K.r));
20vec4 diff = pixA - pixB;
21vec3 YCbCr = diff.rgb * MATRIX;
22YCbCr.x *= LUMINANCE_WEIGHT;
23float d = dot(YCbCr, YCbCr);
24return sqrt(pixA.a * pixB.a * d + diff.a * diff.a);
25}
26
27bool IsPixEqual(const vec4 pixA, const vec4 pixB) {
28return (DistYCbCr(pixA, pixB) < EQUAL_COLOR_TOLERANCE);
29}
30
31bool IsBlendingNeeded(const ivec4 blend) {
32ivec4 diff = blend - ivec4(BLEND_NONE);
33return diff.x != 0 || diff.y != 0 || diff.z != 0 || diff.w != 0;
34}
35
36uint readInputu(uvec2 coord) {
37return readColoru(uvec2(clamp(coord.x, 0, params.width - 1), clamp(coord.y, 0, params.height - 1)));
38}
39
40vec4 readInput(uvec2 coord) {
41return readColorf(uvec2(clamp(coord.x, 0, params.width - 1), clamp(coord.y, 0, params.height - 1)));
42}
43
44void applyScaling(uvec2 origxy) {
45// A1 B1 C1
46// A0 A B C C4
47// D0 D E F F4
48// G0 G H I I4
49// G5 H5 I5
50
51uvec4 t1 = uvec4(origxy.x - 1, origxy.x, origxy.x + 1, origxy.y - 2); // A1 B1 C1
52uvec4 t2 = uvec4(origxy.x - 1, origxy.x, origxy.x + 1, origxy.y - 1); // A B C
53uvec4 t3 = uvec4(origxy.x - 1, origxy.x, origxy.x + 1, origxy.y + 0); // D E F
54uvec4 t4 = uvec4(origxy.x - 1, origxy.x, origxy.x + 1, origxy.y + 1); // G H I
55uvec4 t5 = uvec4(origxy.x - 1, origxy.x, origxy.x + 1, origxy.y + 2); // G5 H5 I5
56uvec4 t6 = uvec4(origxy.x - 2, origxy.y - 1, origxy.y, origxy.y + 1); // A0 D0 G0
57uvec4 t7 = uvec4(origxy.x + 2, origxy.y - 1, origxy.y, origxy.y + 1); // C4 F4 I4
58
59//---------------------------------------
60// Input Pixel Mapping: |21|22|23|
61// 19|06|07|08|09
62// 18|05|00|01|10
63// 17|04|03|02|11
64// |15|14|13|
65
66uint v[9];
67v[0] = readInputu(t3.yw);
68v[1] = readInputu(t3.zw);
69v[2] = readInputu(t4.zw);
70v[3] = readInputu(t4.yw);
71v[4] = readInputu(t4.xw);
72v[5] = readInputu(t3.xw);
73v[6] = readInputu(t2.xw);
74v[7] = readInputu(t2.yw);
75v[8] = readInputu(t2.zw);
76
77vec4 src[25];
78
79src[21] = readInput(t1.xw);
80src[22] = readInput(t1.yw);
81src[23] = readInput(t1.zw);
82src[ 6] = unpackUnorm4x8(v[6]);
83src[ 7] = unpackUnorm4x8(v[7]);
84src[ 8] = unpackUnorm4x8(v[8]);
85src[ 5] = unpackUnorm4x8(v[5]);
86src[ 0] = unpackUnorm4x8(v[0]);
87src[ 1] = unpackUnorm4x8(v[1]);
88src[ 4] = unpackUnorm4x8(v[4]);
89src[ 3] = unpackUnorm4x8(v[3]);
90src[ 2] = unpackUnorm4x8(v[2]);
91src[15] = readInput(t5.xw);
92src[14] = readInput(t5.yw);
93src[13] = readInput(t5.zw);
94src[19] = readInput(t6.xy);
95src[18] = readInput(t6.xz);
96src[17] = readInput(t6.xw);
97src[ 9] = readInput(t7.xy);
98src[10] = readInput(t7.xz);
99src[11] = readInput(t7.xw);
100
101ivec4 blendResult = ivec4(BLEND_NONE);
102
103// Preprocess corners
104// Pixel Tap Mapping: --|--|--|--|--
105// --|--|07|08|--
106// --|05|00|01|10
107// --|04|03|02|11
108// --|--|14|13|--
109// Corner (1, 1)
110if ( ((v[0] == v[1] && v[3] == v[2]) || (v[0] == v[3] && v[1] == v[2])) == false) {
111float dist_03_01 = DistYCbCr(src[ 4], src[ 0]) + DistYCbCr(src[ 0], src[ 8]) + DistYCbCr(src[14], src[ 2]) + DistYCbCr(src[ 2], src[10]) + (4.0 * DistYCbCr(src[ 3], src[ 1]));
112float dist_00_02 = DistYCbCr(src[ 5], src[ 3]) + DistYCbCr(src[ 3], src[13]) + DistYCbCr(src[ 7], src[ 1]) + DistYCbCr(src[ 1], src[11]) + (4.0 * DistYCbCr(src[ 0], src[ 2]));
113bool dominantGradient = (DOMINANT_DIRECTION_THRESHOLD * dist_03_01) < dist_00_02;
114blendResult[2] = ((dist_03_01 < dist_00_02) && (v[0] != v[1]) && (v[0] != v[3])) ? ((dominantGradient) ? BLEND_DOMINANT : BLEND_NORMAL) : BLEND_NONE;
115}
116
117// Pixel Tap Mapping: --|--|--|--|--
118// --|06|07|--|--
119// 18|05|00|01|--
120// 17|04|03|02|--
121// --|15|14|--|--
122// Corner (0, 1)
123if ( ((v[5] == v[0] && v[4] == v[3]) || (v[5] == v[4] && v[0] == v[3])) == false) {
124float dist_04_00 = DistYCbCr(src[17], src[ 5]) + DistYCbCr(src[ 5], src[ 7]) + DistYCbCr(src[15], src[ 3]) + DistYCbCr(src[ 3], src[ 1]) + (4.0 * DistYCbCr(src[ 4], src[ 0]));
125float dist_05_03 = DistYCbCr(src[18], src[ 4]) + DistYCbCr(src[ 4], src[14]) + DistYCbCr(src[ 6], src[ 0]) + DistYCbCr(src[ 0], src[ 2]) + (4.0 * DistYCbCr(src[ 5], src[ 3]));
126bool dominantGradient = (DOMINANT_DIRECTION_THRESHOLD * dist_05_03) < dist_04_00;
127blendResult[3] = ((dist_04_00 > dist_05_03) && (v[0] != v[5]) && (v[0] != v[3])) ? ((dominantGradient) ? BLEND_DOMINANT : BLEND_NORMAL) : BLEND_NONE;
128}
129
130// Pixel Tap Mapping: --|--|22|23|--
131// --|06|07|08|09
132// --|05|00|01|10
133// --|--|03|02|--
134// --|--|--|--|--
135// Corner (1, 0)
136if ( ((v[7] == v[8] && v[0] == v[1]) || (v[7] == v[0] && v[8] == v[1])) == false) {
137float dist_00_08 = DistYCbCr(src[ 5], src[ 7]) + DistYCbCr(src[ 7], src[23]) + DistYCbCr(src[ 3], src[ 1]) + DistYCbCr(src[ 1], src[ 9]) + (4.0 * DistYCbCr(src[ 0], src[ 8]));
138float dist_07_01 = DistYCbCr(src[ 6], src[ 0]) + DistYCbCr(src[ 0], src[ 2]) + DistYCbCr(src[22], src[ 8]) + DistYCbCr(src[ 8], src[10]) + (4.0 * DistYCbCr(src[ 7], src[ 1]));
139bool dominantGradient = (DOMINANT_DIRECTION_THRESHOLD * dist_07_01) < dist_00_08;
140blendResult[1] = ((dist_00_08 > dist_07_01) && (v[0] != v[7]) && (v[0] != v[1])) ? ((dominantGradient) ? BLEND_DOMINANT : BLEND_NORMAL) : BLEND_NONE;
141}
142
143// Pixel Tap Mapping: --|21|22|--|--
144// 19|06|07|08|--
145// 18|05|00|01|--
146// --|04|03|--|--
147// --|--|--|--|--
148// Corner (0, 0)
149if ( ((v[6] == v[7] && v[5] == v[0]) || (v[6] == v[5] && v[7] == v[0])) == false) {
150float dist_05_07 = DistYCbCr(src[18], src[ 6]) + DistYCbCr(src[ 6], src[22]) + DistYCbCr(src[ 4], src[ 0]) + DistYCbCr(src[ 0], src[ 8]) + (4.0 * DistYCbCr(src[ 5], src[ 7]));
151float dist_06_00 = DistYCbCr(src[19], src[ 5]) + DistYCbCr(src[ 5], src[ 3]) + DistYCbCr(src[21], src[ 7]) + DistYCbCr(src[ 7], src[ 1]) + (4.0 * DistYCbCr(src[ 6], src[ 0]));
152bool dominantGradient = (DOMINANT_DIRECTION_THRESHOLD * dist_05_07) < dist_06_00;
153blendResult[0] = ((dist_05_07 < dist_06_00) && (v[0] != v[5]) && (v[0] != v[7])) ? ((dominantGradient) ? BLEND_DOMINANT : BLEND_NORMAL) : BLEND_NONE;
154}
155
156vec4 dst[16];
157dst[ 0] = src[0];
158dst[ 1] = src[0];
159dst[ 2] = src[0];
160dst[ 3] = src[0];
161dst[ 4] = src[0];
162dst[ 5] = src[0];
163dst[ 6] = src[0];
164dst[ 7] = src[0];
165dst[ 8] = src[0];
166dst[ 9] = src[0];
167dst[10] = src[0];
168dst[11] = src[0];
169dst[12] = src[0];
170dst[13] = src[0];
171dst[14] = src[0];
172dst[15] = src[0];
173
174// Scale pixel
175if (IsBlendingNeeded(blendResult) == true) {
176float dist_01_04 = DistYCbCr(src[1], src[4]);
177float dist_03_08 = DistYCbCr(src[3], src[8]);
178bool haveShallowLine = (STEEP_DIRECTION_THRESHOLD * dist_01_04 <= dist_03_08) && (v[0] != v[4]) && (v[5] != v[4]);
179bool haveSteepLine = (STEEP_DIRECTION_THRESHOLD * dist_03_08 <= dist_01_04) && (v[0] != v[8]) && (v[7] != v[8]);
180bool needBlend = (blendResult[2] != BLEND_NONE);
181bool doLineBlend = ( blendResult[2] >= BLEND_DOMINANT ||
182((blendResult[1] != BLEND_NONE && !IsPixEqual(src[0], src[4])) ||
183(blendResult[3] != BLEND_NONE && !IsPixEqual(src[0], src[8])) ||
184(IsPixEqual(src[4], src[3]) && IsPixEqual(src[3], src[2]) && IsPixEqual(src[2], src[1]) && IsPixEqual(src[1], src[8]) && IsPixEqual(src[0], src[2]) == false) ) == false );
185
186vec4 blendPix = ( DistYCbCr(src[0], src[1]) <= DistYCbCr(src[0], src[3]) ) ? src[1] : src[3];
187dst[ 2] = mix(dst[ 2], blendPix, (needBlend && doLineBlend) ? ((haveShallowLine) ? ((haveSteepLine) ? 1.0/3.0 : 0.25) : ((haveSteepLine) ? 0.25 : 0.00)) : 0.00);
188dst[ 9] = mix(dst[ 9], blendPix, (needBlend && doLineBlend && haveSteepLine) ? 0.25 : 0.00);
189dst[10] = mix(dst[10], blendPix, (needBlend && doLineBlend && haveSteepLine) ? 0.75 : 0.00);
190dst[11] = mix(dst[11], blendPix, (needBlend) ? ((doLineBlend) ? ((haveSteepLine) ? 1.00 : ((haveShallowLine) ? 0.75 : 0.50)) : 0.08677704501) : 0.00);
191dst[12] = mix(dst[12], blendPix, (needBlend) ? ((doLineBlend) ? 1.00 : 0.6848532563) : 0.00);
192dst[13] = mix(dst[13], blendPix, (needBlend) ? ((doLineBlend) ? ((haveShallowLine) ? 1.00 : ((haveSteepLine) ? 0.75 : 0.50)) : 0.08677704501) : 0.00);
193dst[14] = mix(dst[14], blendPix, (needBlend && doLineBlend && haveShallowLine) ? 0.75 : 0.00);
194dst[15] = mix(dst[15], blendPix, (needBlend && doLineBlend && haveShallowLine) ? 0.25 : 0.00);
195
196dist_01_04 = DistYCbCr(src[7], src[2]);
197dist_03_08 = DistYCbCr(src[1], src[6]);
198haveShallowLine = (STEEP_DIRECTION_THRESHOLD * dist_01_04 <= dist_03_08) && (v[0] != v[2]) && (v[3] != v[2]);
199haveSteepLine = (STEEP_DIRECTION_THRESHOLD * dist_03_08 <= dist_01_04) && (v[0] != v[6]) && (v[5] != v[6]);
200needBlend = (blendResult[1] != BLEND_NONE);
201doLineBlend = ( blendResult[1] >= BLEND_DOMINANT ||
202!((blendResult[0] != BLEND_NONE && !IsPixEqual(src[0], src[2])) ||
203(blendResult[2] != BLEND_NONE && !IsPixEqual(src[0], src[6])) ||
204(IsPixEqual(src[2], src[1]) && IsPixEqual(src[1], src[8]) && IsPixEqual(src[8], src[7]) && IsPixEqual(src[7], src[6]) && !IsPixEqual(src[0], src[8])) ) );
205
206blendPix = ( DistYCbCr(src[0], src[7]) <= DistYCbCr(src[0], src[1]) ) ? src[7] : src[1];
207dst[ 1] = mix(dst[ 1], blendPix, (needBlend && doLineBlend) ? ((haveShallowLine) ? ((haveSteepLine) ? 1.0/3.0 : 0.25) : ((haveSteepLine) ? 0.25 : 0.00)) : 0.00);
208dst[ 6] = mix(dst[ 6], blendPix, (needBlend && doLineBlend && haveSteepLine) ? 0.25 : 0.00);
209dst[ 7] = mix(dst[ 7], blendPix, (needBlend && doLineBlend && haveSteepLine) ? 0.75 : 0.00);
210dst[ 8] = mix(dst[ 8], blendPix, (needBlend) ? ((doLineBlend) ? ((haveSteepLine) ? 1.00 : ((haveShallowLine) ? 0.75 : 0.50)) : 0.08677704501) : 0.00);
211dst[ 9] = mix(dst[ 9], blendPix, (needBlend) ? ((doLineBlend) ? 1.00 : 0.6848532563) : 0.00);
212dst[10] = mix(dst[10], blendPix, (needBlend) ? ((doLineBlend) ? ((haveShallowLine) ? 1.00 : ((haveSteepLine) ? 0.75 : 0.50)) : 0.08677704501) : 0.00);
213dst[11] = mix(dst[11], blendPix, (needBlend && doLineBlend && haveShallowLine) ? 0.75 : 0.00);
214dst[12] = mix(dst[12], blendPix, (needBlend && doLineBlend && haveShallowLine) ? 0.25 : 0.00);
215
216dist_01_04 = DistYCbCr(src[5], src[8]);
217dist_03_08 = DistYCbCr(src[7], src[4]);
218haveShallowLine = (STEEP_DIRECTION_THRESHOLD * dist_01_04 <= dist_03_08) && (v[0] != v[8]) && (v[1] != v[8]);
219haveSteepLine = (STEEP_DIRECTION_THRESHOLD * dist_03_08 <= dist_01_04) && (v[0] != v[4]) && (v[3] != v[4]);
220needBlend = (blendResult[0] != BLEND_NONE);
221doLineBlend = ( blendResult[0] >= BLEND_DOMINANT ||
222!((blendResult[3] != BLEND_NONE && !IsPixEqual(src[0], src[8])) ||
223(blendResult[1] != BLEND_NONE && !IsPixEqual(src[0], src[4])) ||
224(IsPixEqual(src[8], src[7]) && IsPixEqual(src[7], src[6]) && IsPixEqual(src[6], src[5]) && IsPixEqual(src[5], src[4]) && !IsPixEqual(src[0], src[6])) ) );
225
226blendPix = ( DistYCbCr(src[0], src[5]) <= DistYCbCr(src[0], src[7]) ) ? src[5] : src[7];
227dst[ 0] = mix(dst[ 0], blendPix, (needBlend && doLineBlend) ? ((haveShallowLine) ? ((haveSteepLine) ? 1.0/3.0 : 0.25) : ((haveSteepLine) ? 0.25 : 0.00)) : 0.00);
228dst[15] = mix(dst[15], blendPix, (needBlend && doLineBlend && haveSteepLine) ? 0.25 : 0.00);
229dst[ 4] = mix(dst[ 4], blendPix, (needBlend && doLineBlend && haveSteepLine) ? 0.75 : 0.00);
230dst[ 5] = mix(dst[ 5], blendPix, (needBlend) ? ((doLineBlend) ? ((haveSteepLine) ? 1.00 : ((haveShallowLine) ? 0.75 : 0.50)) : 0.08677704501) : 0.00);
231dst[ 6] = mix(dst[ 6], blendPix, (needBlend) ? ((doLineBlend) ? 1.00 : 0.6848532563) : 0.00);
232dst[ 7] = mix(dst[ 7], blendPix, (needBlend) ? ((doLineBlend) ? ((haveShallowLine) ? 1.00 : ((haveSteepLine) ? 0.75 : 0.50)) : 0.08677704501) : 0.00);
233dst[ 8] = mix(dst[ 8], blendPix, (needBlend && doLineBlend && haveShallowLine) ? 0.75 : 0.00);
234dst[ 9] = mix(dst[ 9], blendPix, (needBlend && doLineBlend && haveShallowLine) ? 0.25 : 0.00);
235
236dist_01_04 = DistYCbCr(src[3], src[6]);
237dist_03_08 = DistYCbCr(src[5], src[2]);
238haveShallowLine = (STEEP_DIRECTION_THRESHOLD * dist_01_04 <= dist_03_08) && (v[0] != v[6]) && (v[7] != v[6]);
239haveSteepLine = (STEEP_DIRECTION_THRESHOLD * dist_03_08 <= dist_01_04) && (v[0] != v[2]) && (v[1] != v[2]);
240needBlend = (blendResult[3] != BLEND_NONE);
241doLineBlend = ( blendResult[3] >= BLEND_DOMINANT ||
242!((blendResult[2] != BLEND_NONE && !IsPixEqual(src[0], src[6])) ||
243(blendResult[0] != BLEND_NONE && !IsPixEqual(src[0], src[2])) ||
244(IsPixEqual(src[6], src[5]) && IsPixEqual(src[5], src[4]) && IsPixEqual(src[4], src[3]) && IsPixEqual(src[3], src[2]) && !IsPixEqual(src[0], src[4])) ) );
245
246blendPix = ( DistYCbCr(src[0], src[3]) <= DistYCbCr(src[0], src[5]) ) ? src[3] : src[5];
247dst[ 3] = mix(dst[ 3], blendPix, (needBlend && doLineBlend) ? ((haveShallowLine) ? ((haveSteepLine) ? 1.0/3.0 : 0.25) : ((haveSteepLine) ? 0.25 : 0.00)) : 0.00);
248dst[12] = mix(dst[12], blendPix, (needBlend && doLineBlend && haveSteepLine) ? 0.25 : 0.00);
249dst[13] = mix(dst[13], blendPix, (needBlend && doLineBlend && haveSteepLine) ? 0.75 : 0.00);
250dst[14] = mix(dst[14], blendPix, (needBlend) ? ((doLineBlend) ? ((haveSteepLine) ? 1.00 : ((haveShallowLine) ? 0.75 : 0.50)) : 0.08677704501) : 0.00);
251dst[15] = mix(dst[15], blendPix, (needBlend) ? ((doLineBlend) ? 1.00 : 0.6848532563) : 0.00);
252dst[ 4] = mix(dst[ 4], blendPix, (needBlend) ? ((doLineBlend) ? ((haveShallowLine) ? 1.00 : ((haveSteepLine) ? 0.75 : 0.50)) : 0.08677704501) : 0.00);
253dst[ 5] = mix(dst[ 5], blendPix, (needBlend && doLineBlend && haveShallowLine) ? 0.75 : 0.00);
254dst[ 6] = mix(dst[ 6], blendPix, (needBlend && doLineBlend && haveShallowLine) ? 0.25 : 0.00);
255}
256
257// This is the only difference from tex_4xbrz.csh:
258
259// Output Pixel Mapping:
260// 06|07|08|09
261// 05|00|01|10
262// 04|03|02|11
263// 15|14|13|12
264// Write all 16 output pixels.
265ivec2 destXY = ivec2(origxy) * 2;
266
267vec4 topLeft = dst[6] + dst[7] + dst[5] + dst[0];
268vec4 topRight = dst[8] + dst[9] + dst[1] + dst[10];
269vec4 bottomLeft = dst[4] + dst[3] + dst[15] + dst[14];
270vec4 bottomRight = dst[2] + dst[11] + dst[13] + dst[12];
271writeColorf(destXY, topLeft * 0.25);
272writeColorf(destXY + ivec2(1, 0), topRight * 0.25);
273writeColorf(destXY + ivec2(0, 1), bottomLeft * 0.25);
274writeColorf(destXY + ivec2(1, 1), bottomRight * 0.25);
275}
276