3 static std::string get_blend_glsl()
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5 static std::string glsl =
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7 "\n ** Photoshop & misc math "
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8 "\n ** Blending modes, RGB/HSL/Contrast/Desaturate, levels control "
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10 "\n ** Romain Dura | Romz "
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11 "\n ** Blog: http://blog.mouaif.org "
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12 "\n ** Post: http://blog.mouaif.org/?p=94 "
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17 "\n ** Desaturation "
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20 "\n vec4 Desaturate(vec3 color, float Desaturation) "
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22 "\n vec3 grayXfer = vec3(0.3, 0.59, 0.11); "
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23 "\n vec3 gray = vec3(dot(grayXfer, color)); "
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24 "\n return vec4(mix(color, gray, Desaturation), 1.0); "
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29 "\n ** Hue, saturation, luminance "
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32 "\n vec3 RGBToHSL(vec3 color) "
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36 "\n float fmin = min(min(color.r, color.g), color.b); "
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37 "\n float fmax = max(max(color.r, color.g), color.b); "
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38 "\n float delta = fmax - fmin; "
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40 "\n hsl.z = (fmax + fmin) / 2.0; "
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42 "\n if (delta == 0.0) "
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49 "\n if (hsl.z < 0.5) "
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50 "\n hsl.y = delta / (fmax + fmin); "
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52 "\n hsl.y = delta / (2.0 - fmax - fmin); "
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54 "\n float deltaR = (((fmax - color.r) / 6.0) + (delta / 2.0)) / delta; "
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55 "\n float deltaG = (((fmax - color.g) / 6.0) + (delta / 2.0)) / delta; "
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56 "\n float deltaB = (((fmax - color.b) / 6.0) + (delta / 2.0)) / delta; "
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58 "\n if (color.r == fmax ) "
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59 "\n hsl.x = deltaB - deltaG; "
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60 "\n else if (color.g == fmax) "
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61 "\n hsl.x = (1.0 / 3.0) + deltaR - deltaB; "
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62 "\n else if (color.b == fmax) "
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63 "\n hsl.x = (2.0 / 3.0) + deltaG - deltaR; "
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65 "\n if (hsl.x < 0.0) "
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67 "\n else if (hsl.x > 1.0) "
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74 "\n float HueToRGB(float f1, float f2, float hue) "
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76 "\n if (hue < 0.0) "
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78 "\n else if (hue > 1.0) "
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81 "\n if ((6.0 * hue) < 1.0) "
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82 "\n res = f1 + (f2 - f1) * 6.0 * hue; "
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83 "\n else if ((2.0 * hue) < 1.0) "
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85 "\n else if ((3.0 * hue) < 2.0) "
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86 "\n res = f1 + (f2 - f1) * ((2.0 / 3.0) - hue) * 6.0; "
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92 "\n vec3 HSLToRGB(vec3 hsl) "
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96 "\n if (hsl.y == 0.0) "
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97 "\n rgb = vec3(hsl.z); "
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102 "\n if (hsl.z < 0.5) "
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103 "\n f2 = hsl.z * (1.0 + hsl.y); "
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105 "\n f2 = (hsl.z + hsl.y) - (hsl.y * hsl.z); "
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107 "\n float f1 = 2.0 * hsl.z - f2; "
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109 "\n rgb.r = HueToRGB(f1, f2, hsl.x + (1.0/3.0)); "
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110 "\n rgb.g = HueToRGB(f1, f2, hsl.x); "
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111 "\n rgb.b= HueToRGB(f1, f2, hsl.x - (1.0/3.0)); "
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119 "\n ** Contrast, saturation, brightness "
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120 "\n ** Code of this function is from TGM's shader pack "
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121 "\n ** http://irrlicht.sourceforge.net/phpBB2/viewtopic.php?t=21057 "
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124 "\n vec3 ContrastSaturationBrightness(vec3 color, float brt, float sat, float con) "
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126 "\n const float AvgLumR = 0.5; "
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127 "\n const float AvgLumG = 0.5; "
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128 "\n const float AvgLumB = 0.5; "
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130 "\n const vec3 LumCoeff = vec3(0.2125, 0.7154, 0.0721); "
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132 "\n vec3 AvgLumin = vec3(AvgLumR, AvgLumG, AvgLumB); "
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133 "\n vec3 brtColor = color * brt; "
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134 "\n vec3 intensity = vec3(dot(brtColor, LumCoeff)); "
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135 "\n vec3 satColor = mix(intensity, brtColor, sat); "
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136 "\n vec3 conColor = mix(AvgLumin, satColor, con); "
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137 "\n return conColor; "
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142 "\n ** Float blending modes "
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143 "\n ** Adapted from here: http://www.nathanm.com/photoshop-blending-math/ "
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144 "\n ** But I modified the HardMix (wrong condition), Overlay, SoftLight, ColorDodge, ColorBurn, VividLight, PinLight (inverted layers) ones to have correct results "
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147 "\n#define BlendLinearDodgef BlendAddf \n "
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148 "\n#define BlendLinearBurnf BlendSubstractf \n "
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149 "\n#define BlendAddf(base, blend) min(base + blend, 1.0) \n "
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150 "\n#define BlendSubstractf(base, blend) max(base + blend - 1.0, 0.0) \n "
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151 "\n#define BlendLightenf(base, blend) max(blend, base) \n "
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152 "\n#define BlendDarkenf(base, blend) min(blend, base) \n "
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153 "\n#define BlendLinearLightf(base, blend) (blend < 0.5 ? BlendLinearBurnf(base, (2.0 * blend)) : BlendLinearDodgef(base, (2.0 * (blend - 0.5)))) \n "
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154 "\n#define BlendScreenf(base, blend) (1.0 - ((1.0 - base) * (1.0 - blend))) \n "
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155 "\n#define BlendOverlayf(base, blend) (base < 0.5 ? (2.0 * base * blend) : (1.0 - 2.0 * (1.0 - base) * (1.0 - blend))) \n "
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156 "\n#define BlendSoftLightf(base, blend) ((blend < 0.5) ? (2.0 * base * blend + base * base * (1.0 - 2.0 * blend)) : (sqrt(base) * (2.0 * blend - 1.0) + 2.0 * base * (1.0 - blend))) \n "
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157 "\n#define BlendColorDodgef(base, blend) ((blend == 1.0) ? blend : min(base / (1.0 - blend), 1.0)) \n "
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158 "\n#define BlendColorBurnf(base, blend) ((blend == 0.0) ? blend : max((1.0 - ((1.0 - base) / blend)), 0.0)) \n "
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159 "\n#define BlendVividLightf(base, blend) ((blend < 0.5) ? BlendColorBurnf(base, (2.0 * blend)) : BlendColorDodgef(base, (2.0 * (blend - 0.5)))) \n "
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160 "\n#define BlendPinLightf(base, blend) ((blend < 0.5) ? BlendDarkenf(base, (2.0 * blend)) : BlendLightenf(base, (2.0 *(blend - 0.5)))) \n "
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161 "\n#define BlendHardMixf(base, blend) ((BlendVividLightf(base, blend) < 0.5) ? 0.0 : 1.0) \n "
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162 "\n#define BlendReflectf(base, blend) ((blend == 1.0) ? blend : min(base * base / (1.0 - blend), 1.0)) \n "
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166 "\n ** Vector3 blending modes "
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169 "\n#define Blend(base, blend, funcf) vec3(funcf(base.r, blend.r), funcf(base.g, blend.g), funcf(base.b, blend.b)) \n "
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171 "\n#define BlendNormal(base, blend) (blend) \n "
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172 "\n#define BlendLighten BlendLightenf \n "
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173 "\n#define BlendDarken BlendDarkenf \n "
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174 "\n#define BlendMultiply(base, blend) (base * blend) \n "
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175 "\n#define BlendAverage(base, blend) ((base + blend) / 2.0) \n "
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176 "\n#define BlendAdd(base, blend) min(base + blend, vec3(1.0)) \n "
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177 "\n#define BlendSubstract(base, blend) max(base + blend - vec3(1.0), vec3(0.0)) \n "
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178 "\n#define BlendDifference(base, blend) abs(base - blend) \n "
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179 "\n#define BlendNegation(base, blend) (vec3(1.0) - abs(vec3(1.0) - base - blend)) \n "
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180 "\n#define BlendExclusion(base, blend) (base + blend - 2.0 * base * blend) \n "
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181 "\n#define BlendScreen(base, blend) Blend(base, blend, BlendScreenf) \n "
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182 "\n#define BlendOverlay(base, blend) Blend(base, blend, BlendOverlayf) \n "
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183 "\n#define BlendSoftLight(base, blend) Blend(base, blend, BlendSoftLightf) \n "
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184 "\n#define BlendHardLight(base, blend) BlendOverlay(blend, base) \n "
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185 "\n#define BlendColorDodge(base, blend) Blend(base, blend, BlendColorDodgef) \n "
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186 "\n#define BlendColorBurn(base, blend) Blend(base, blend, BlendColorBurnf) \n "
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187 "\n#define BlendLinearDodge BlendAdd \n "
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188 "\n#define BlendLinearBurn BlendSubstract \n "
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189 "\n#define BlendLinearLight(base, blend) Blend(base, blend, BlendLinearLightf) \n "
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190 "\n#define BlendVividLight(base, blend) Blend(base, blend, BlendVividLightf) \n "
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191 "\n#define BlendPinLight(base, blend) Blend(base, blend, BlendPinLightf) \n "
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192 "\n#define BlendHardMix(base, blend) Blend(base, blend, BlendHardMixf) \n "
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193 "\n#define BlendReflect(base, blend) Blend(base, blend, BlendReflectf) \n "
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194 "\n#define BlendGlow(base, blend) BlendReflect(blend, base) \n "
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195 "\n#define BlendPhoenix(base, blend) (min(base, blend) - max(base, blend) + vec3(1.0)) \n "
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196 "\n#define BlendOpacity(base, blend, F, O) (F(base, blend) * O + blend * (1.0 - O)) \n "
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199 "\n vec3 BlendHue(vec3 base, vec3 blend) "
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201 "\n vec3 baseHSL = RGBToHSL(base); "
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202 "\n return HSLToRGB(vec3(RGBToHSL(blend).r, baseHSL.g, baseHSL.b)); "
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205 "\n vec3 BlendSaturation(vec3 base, vec3 blend) "
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207 "\n vec3 baseHSL = RGBToHSL(base); "
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208 "\n return HSLToRGB(vec3(baseHSL.r, RGBToHSL(blend).g, baseHSL.b)); "
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211 "\n vec3 BlendColor(vec3 base, vec3 blend) "
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213 "\n vec3 blendHSL = RGBToHSL(blend); "
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214 "\n return HSLToRGB(vec3(blendHSL.r, blendHSL.g, RGBToHSL(base).b)); "
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217 "\n vec3 BlendLuminosity(vec3 base, vec3 blend) "
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219 "\n vec3 baseHSL = RGBToHSL(base); "
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220 "\n return HSLToRGB(vec3(baseHSL.r, baseHSL.g, RGBToHSL(blend).b)); "
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225 "\n ** Gamma correction "
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226 "\n ** Details: http://blog.mouaif.org/2009/01/22/photoshop-gamma-correction-shader/ "
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229 "\n#define GammaCorrection(color, gamma) pow(color, 1.0 / gamma) \n "
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232 "\n ** Levels control (input (+gamma), output) "
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233 "\n ** Details: http://blog.mouaif.org/2009/01/28/levels-control-shader/ "
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236 "\n#define LevelsControlInputRange(color, minInput, maxInput) min(max(color - vec3(minInput), vec3(0.0)) / (vec3(maxInput) - vec3(minInput)), vec3(1.0)) \n "
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237 "\n#define LevelsControlInput(color, minInput, gamma, maxInput) GammaCorrection(LevelsControlInputRange(color, minInput, maxInput), gamma) \n "
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238 "\n#define LevelsControlOutputRange(color, minOutput, maxOutput) mix(vec3(minOutput), vec3(maxOutput), color) \n "
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239 "\n#define LevelsControl(color, minInput, gamma, maxInput, minOutput, maxOutput) LevelsControlOutputRange(LevelsControlInput(color, minInput, gamma, maxInput), minOutput, maxOutput) \n "
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