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Add xBRZ and bandlimit pixel footprint shaders ported by hunterk
author Michael Pavone <pavone@retrodev.com>
date Sun, 28 Apr 2024 23:22:37 -0700
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2495
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1 // xBRZ freescale
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2 // based on :
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3
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4 /*
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5 Hyllian's xBR-vertex code and texel mapping
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6
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7 Copyright (C) 2011/2016 Hyllian - sergiogdb@gmail.com
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8
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9 Permission is hereby granted, free of charge, to any person obtaining a copy
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10 of this software and associated documentation files (the "Software"), to deal
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11 in the Software without restriction, including without limitation the rights
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12 to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
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13 copies of the Software, and to permit persons to whom the Software is
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14 furnished to do so, subject to the following conditions:
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15
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16 The above copyright notice and this permission notice shall be included in
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17 all copies or substantial portions of the Software.
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18
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19 THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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20 IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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21 FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
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22 AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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23 LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
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24 OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
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25 THE SOFTWARE.
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26
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27 */
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28
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29 // This shader also uses code and/or concepts from xBRZ as it appears
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30 // in the Desmume source code. The license for which is as follows:
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31
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32 // ****************************************************************************
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33 // * This file is part of the HqMAME project. It is distributed under *
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34 // * GNU General Public License: http://www.gnu.org/licenses/gpl-3.0 *
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35 // * Copyright (C) Zenju (zenju AT gmx DOT de) - All Rights Reserved *
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36 // * *
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37 // * Additionally and as a special exception, the author gives permission *
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38 // * to link the code of this program with the MAME library (or with modified *
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39 // * versions of MAME that use the same license as MAME), and distribute *
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40 // * linked combinations including the two. You must obey the GNU General *
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41 // * Public License in all respects for all of the code used other than MAME. *
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42 // * If you modify this file, you may extend this exception to your version *
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43 // * of the file, but you are not obligated to do so. If you do not wish to *
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44 // * do so, delete this exception statement from your version. *
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45 // ****************************************************************************
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46 // ported to blastem shader format by hunterk
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47
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48 uniform sampler2D textures[2];
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49 uniform mediump vec2 texsize;
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50 varying mediump vec2 texcoord;
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51
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52 #define BLEND_NONE 0
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53 #define BLEND_NORMAL 1
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54 #define BLEND_DOMINANT 2
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55 #define LUMINANCE_WEIGHT 1.0
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56 #define EQUAL_COLOR_TOLERANCE 30.0/255.0
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57 #define STEEP_DIRECTION_THRESHOLD 2.2
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58 #define DOMINANT_DIRECTION_THRESHOLD 3.6
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59
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60 // this is usually handled automatically but blastem doesn't expose output size?
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61 #define scale vec2(10.0, 10.0)
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62
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63 mediump float DistYCbCr(vec3 pixA, vec3 pixB)
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64 {
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65 const vec3 w = vec3(0.2627, 0.6780, 0.0593);
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66 const float scaleB = 0.5 / (1.0 - w.b);
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67 const float scaleR = 0.5 / (1.0 - w.r);
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68 vec3 diff = pixA - pixB;
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69 float Y = dot(diff.rgb, w);
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70 float Cb = scaleB * (diff.b - Y);
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71 float Cr = scaleR * (diff.r - Y);
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72
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73 return sqrt(((LUMINANCE_WEIGHT * Y) * (LUMINANCE_WEIGHT * Y)) + (Cb * Cb) + (Cr * Cr));
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74 }
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75
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76 bool IsPixEqual(const vec3 pixA, const vec3 pixB)
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77 {
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78 return (DistYCbCr(pixA, pixB) < EQUAL_COLOR_TOLERANCE);
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79 }
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80
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81 mediump float get_left_ratio(vec2 center, vec2 origin, vec2 direction, vec2 scale_)
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82 {
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83 vec2 P0 = center - origin;
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84 vec2 proj = direction * (dot(P0, direction) / dot(direction, direction));
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85 vec2 distv = P0 - proj;
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86 vec2 orth = vec2(-direction.y, direction.x);
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87 float side = sign(dot(P0, orth));
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88 float v = side * length(distv * scale_);
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89
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90 // return step(0, v);
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91 return smoothstep(-sqrt(2.0)/2.0, sqrt(2.0)/2.0, v);
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92 }
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93
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94 #define eq(a,b) (a == b)
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95 #define neq(a,b) (a != b)
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96
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97 #define P(x,y) texture2D(textures[0], coord + (1.0 / texsize) * vec2(x, y)).rgb
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98
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99 void main()
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100 {
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101 //---------------------------------------
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102 // Input Pixel Mapping: -|x|x|x|-
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103 // x|A|B|C|x
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104 // x|D|E|F|x
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105 // x|G|H|I|x
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106 // -|x|x|x|-
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107
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108 vec2 pos = fract(texcoord * texsize.xy) - vec2(0.5, 0.5);
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109 vec2 coord = texcoord - pos * (1.0 / texsize.xy);
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110
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111 vec3 A = P(-1,-1);
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112 vec3 B = P( 0,-1);
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113 vec3 C = P( 1,-1);
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114 vec3 D = P(-1, 0);
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115 vec3 E = P( 0, 0);
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116 vec3 F = P( 1, 0);
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117 vec3 G = P(-1, 1);
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118 vec3 H = P( 0, 1);
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119 vec3 I = P( 1, 1);
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120
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121 // blendResult Mapping: x|y|
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122 // w|z|
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123 ivec4 blendResult = ivec4(BLEND_NONE,BLEND_NONE,BLEND_NONE,BLEND_NONE);
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124
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125 // Preprocess corners
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126 // Pixel Tap Mapping: -|-|-|-|-
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127 // -|-|B|C|-
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128 // -|D|E|F|x
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129 // -|G|H|I|x
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130 // -|-|x|x|-
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131 if (!((eq(E,F) && eq(H,I)) || (eq(E,H) && eq(F,I))))
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132 {
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133 float dist_H_F = DistYCbCr(G, E) + DistYCbCr(E, C) + DistYCbCr(P(0,2), I) + DistYCbCr(I, P(2,0)) + (4.0 * DistYCbCr(H, F));
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134 float dist_E_I = DistYCbCr(D, H) + DistYCbCr(H, P(1,2)) + DistYCbCr(B, F) + DistYCbCr(F, P(2,1)) + (4.0 * DistYCbCr(E, I));
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135 bool dominantGradient = (DOMINANT_DIRECTION_THRESHOLD * dist_H_F) < dist_E_I;
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136 blendResult.z = ((dist_H_F < dist_E_I) && neq(E,F) && neq(E,H)) ? ((dominantGradient) ? BLEND_DOMINANT : BLEND_NORMAL) : BLEND_NONE;
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137 }
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138
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139
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140 // Pixel Tap Mapping: -|-|-|-|-
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141 // -|A|B|-|-
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142 // x|D|E|F|-
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143 // x|G|H|I|-
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144 // -|x|x|-|-
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145 if (!((eq(D,E) && eq(G,H)) || (eq(D,G) && eq(E,H))))
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146 {
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147 float dist_G_E = DistYCbCr(P(-2,1) , D) + DistYCbCr(D, B) + DistYCbCr(P(-1,2), H) + DistYCbCr(H, F) + (4.0 * DistYCbCr(G, E));
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148 float dist_D_H = DistYCbCr(P(-2,0) , G) + DistYCbCr(G, P(0,2)) + DistYCbCr(A, E) + DistYCbCr(E, I) + (4.0 * DistYCbCr(D, H));
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149 bool dominantGradient = (DOMINANT_DIRECTION_THRESHOLD * dist_D_H) < dist_G_E;
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150 blendResult.w = ((dist_G_E > dist_D_H) && neq(E,D) && neq(E,H)) ? ((dominantGradient) ? BLEND_DOMINANT : BLEND_NORMAL) : BLEND_NONE;
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151 }
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152
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153 // Pixel Tap Mapping: -|-|x|x|-
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154 // -|A|B|C|x
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155 // -|D|E|F|x
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156 // -|-|H|I|-
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157 // -|-|-|-|-
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158 if (!((eq(B,C) && eq(E,F)) || (eq(B,E) && eq(C,F))))
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159 {
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160 float dist_E_C = DistYCbCr(D, B) + DistYCbCr(B, P(1,-2)) + DistYCbCr(H, F) + DistYCbCr(F, P(2,-1)) + (4.0 * DistYCbCr(E, C));
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161 float dist_B_F = DistYCbCr(A, E) + DistYCbCr(E, I) + DistYCbCr(P(0,-2), C) + DistYCbCr(C, P(2,0)) + (4.0 * DistYCbCr(B, F));
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162 bool dominantGradient = (DOMINANT_DIRECTION_THRESHOLD * dist_B_F) < dist_E_C;
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163 blendResult.y = ((dist_E_C > dist_B_F) && neq(E,B) && neq(E,F)) ? ((dominantGradient) ? BLEND_DOMINANT : BLEND_NORMAL) : BLEND_NONE;
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164 }
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165
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166 // Pixel Tap Mapping: -|x|x|-|-
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167 // x|A|B|C|-
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168 // x|D|E|F|-
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169 // -|G|H|-|-
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170 // -|-|-|-|-
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171 if (!((eq(A,B) && eq(D,E)) || (eq(A,D) && eq(B,E))))
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172 {
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173 float dist_D_B = DistYCbCr(P(-2,0), A) + DistYCbCr(A, P(0,-2)) + DistYCbCr(G, E) + DistYCbCr(E, C) + (4.0 * DistYCbCr(D, B));
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174 float dist_A_E = DistYCbCr(P(-2,-1), D) + DistYCbCr(D, H) + DistYCbCr(P(-1,-2), B) + DistYCbCr(B, F) + (4.0 * DistYCbCr(A, E));
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175 bool dominantGradient = (DOMINANT_DIRECTION_THRESHOLD * dist_D_B) < dist_A_E;
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176 blendResult.x = ((dist_D_B < dist_A_E) && neq(E,D) && neq(E,B)) ? ((dominantGradient) ? BLEND_DOMINANT : BLEND_NORMAL) : BLEND_NONE;
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177 }
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178
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179 vec3 res = E;
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180
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181 // Pixel Tap Mapping: -|-|-|-|-
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182 // -|-|B|C|-
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183 // -|D|E|F|x
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184 // -|G|H|I|x
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185 // -|-|x|x|-
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186 if(blendResult.z != BLEND_NONE)
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187 {
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188 float dist_F_G = DistYCbCr(F, G);
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189 float dist_H_C = DistYCbCr(H, C);
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190 bool doLineBlend = (blendResult.z == BLEND_DOMINANT ||
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191 !((blendResult.y != BLEND_NONE && !IsPixEqual(E, G)) || (blendResult.w != BLEND_NONE && !IsPixEqual(E, C)) ||
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192 (IsPixEqual(G, H) && IsPixEqual(H, I) && IsPixEqual(I, F) && IsPixEqual(F, C) && !IsPixEqual(E, I))));
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193
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194 vec2 origin = vec2(0.0, 1.0 / sqrt(2.0));
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195 vec2 direction = vec2(1.0, -1.0);
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196 if(doLineBlend)
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197 {
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198 bool haveShallowLine = (STEEP_DIRECTION_THRESHOLD * dist_F_G <= dist_H_C) && neq(E,G) && neq(D,G);
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199 bool haveSteepLine = (STEEP_DIRECTION_THRESHOLD * dist_H_C <= dist_F_G) && neq(E,C) && neq(B,C);
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200 origin = haveShallowLine? vec2(0.0, 0.25) : vec2(0.0, 0.5);
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201 direction.x += haveShallowLine? 1.0: 0.0;
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202 direction.y -= haveSteepLine? 1.0: 0.0;
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203 }
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204
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205 vec3 blendPix = mix(H,F, step(DistYCbCr(E, F), DistYCbCr(E, H)));
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206 res = mix(res, blendPix, get_left_ratio(pos, origin, direction, scale));
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207 }
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208
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209 // Pixel Tap Mapping: -|-|-|-|-
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210 // -|A|B|-|-
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211 // x|D|E|F|-
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212 // x|G|H|I|-
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213 // -|x|x|-|-
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214 if(blendResult.w != BLEND_NONE)
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215 {
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216 float dist_H_A = DistYCbCr(H, A);
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217 float dist_D_I = DistYCbCr(D, I);
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218 bool doLineBlend = (blendResult.w == BLEND_DOMINANT ||
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219 !((blendResult.z != BLEND_NONE && !IsPixEqual(E, A)) || (blendResult.x != BLEND_NONE && !IsPixEqual(E, I)) ||
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220 (IsPixEqual(A, D) && IsPixEqual(D, G) && IsPixEqual(G, H) && IsPixEqual(H, I) && !IsPixEqual(E, G))));
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221
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222 vec2 origin = vec2(-1.0 / sqrt(2.0), 0.0);
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223 vec2 direction = vec2(1.0, 1.0);
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224 if(doLineBlend)
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225 {
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226 bool haveShallowLine = (STEEP_DIRECTION_THRESHOLD * dist_H_A <= dist_D_I) && neq(E,A) && neq(B,A);
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227 bool haveSteepLine = (STEEP_DIRECTION_THRESHOLD * dist_D_I <= dist_H_A) && neq(E,I) && neq(F,I);
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228 origin = haveShallowLine? vec2(-0.25, 0.0) : vec2(-0.5, 0.0);
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229 direction.y += haveShallowLine? 1.0: 0.0;
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230 direction.x += haveSteepLine? 1.0: 0.0;
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231 }
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232 origin = origin;
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233 direction = direction;
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234
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235 vec3 blendPix = mix(H,D, step(DistYCbCr(E, D), DistYCbCr(E, H)));
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236 res = mix(res, blendPix, get_left_ratio(pos, origin, direction, scale));
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237 }
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238
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239 // Pixel Tap Mapping: -|-|x|x|-
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240 // -|A|B|C|x
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241 // -|D|E|F|x
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242 // -|-|H|I|-
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243 // -|-|-|-|-
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244 if(blendResult.y != BLEND_NONE)
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245 {
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246 float dist_B_I = DistYCbCr(B, I);
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247 float dist_F_A = DistYCbCr(F, A);
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248 bool doLineBlend = (blendResult.y == BLEND_DOMINANT ||
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249 !((blendResult.x != BLEND_NONE && !IsPixEqual(E, I)) || (blendResult.z != BLEND_NONE && !IsPixEqual(E, A)) ||
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250 (IsPixEqual(I, F) && IsPixEqual(F, C) && IsPixEqual(C, B) && IsPixEqual(B, A) && !IsPixEqual(E, C))));
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251
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252 vec2 origin = vec2(1.0 / sqrt(2.0), 0.0);
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253 vec2 direction = vec2(-1.0, -1.0);
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254
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255 if(doLineBlend)
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256 {
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257 bool haveShallowLine = (STEEP_DIRECTION_THRESHOLD * dist_B_I <= dist_F_A) && neq(E,I) && neq(H,I);
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258 bool haveSteepLine = (STEEP_DIRECTION_THRESHOLD * dist_F_A <= dist_B_I) && neq(E,A) && neq(D,A);
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259 origin = haveShallowLine? vec2(0.25, 0.0) : vec2(0.5, 0.0);
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260 direction.y -= haveShallowLine? 1.0: 0.0;
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261 direction.x -= haveSteepLine? 1.0: 0.0;
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262 }
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263
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264 vec3 blendPix = mix(F,B, step(DistYCbCr(E, B), DistYCbCr(E, F)));
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265 res = mix(res, blendPix, get_left_ratio(pos, origin, direction, scale));
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266 }
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267
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268 // Pixel Tap Mapping: -|x|x|-|-
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269 // x|A|B|C|-
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270 // x|D|E|F|-
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271 // -|G|H|-|-
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272 // -|-|-|-|-
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273 if(blendResult.x != BLEND_NONE)
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274 {
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275 float dist_D_C = DistYCbCr(D, C);
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276 float dist_B_G = DistYCbCr(B, G);
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277 bool doLineBlend = (blendResult.x == BLEND_DOMINANT ||
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278 !((blendResult.w != BLEND_NONE && !IsPixEqual(E, C)) || (blendResult.y != BLEND_NONE && !IsPixEqual(E, G)) ||
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279 (IsPixEqual(C, B) && IsPixEqual(B, A) && IsPixEqual(A, D) && IsPixEqual(D, G) && !IsPixEqual(E, A))));
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280
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281 vec2 origin = vec2(0.0, -1.0 / sqrt(2.0));
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282 vec2 direction = vec2(-1.0, 1.0);
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283 if(doLineBlend)
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284 {
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285 bool haveShallowLine = (STEEP_DIRECTION_THRESHOLD * dist_D_C <= dist_B_G) && neq(E,C) && neq(F,C);
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286 bool haveSteepLine = (STEEP_DIRECTION_THRESHOLD * dist_B_G <= dist_D_C) && neq(E,G) && neq(H,G);
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287 origin = haveShallowLine? vec2(0.0, -0.25) : vec2(0.0, -0.5);
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288 direction.x -= haveShallowLine? 1.0: 0.0;
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289 direction.y += haveSteepLine? 1.0: 0.0;
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290 }
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291
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292 vec3 blendPix = mix(D,B, step(DistYCbCr(E, B), DistYCbCr(E, D)));
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293 res = mix(res, blendPix, get_left_ratio(pos, origin, direction, scale));
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294 }
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295
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296 gl_FragColor = vec4(res, 1.0);
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297 }