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Reimagined/shaderpacks/Reimagined - Low/shaders/lib/atmospherics/auroraBorealis.glsl
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Leonid Pershin 84fb173ea8 first commit
2026-05-07 21:38:27 +03:00

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#if !defined AURORA_BOREALIS_GLSL
#define AURORA_BOREALIS_GLSL
#ifdef ATM_COLOR_MULTS
#include "/lib/colors/colorMultipliers.glsl"
#endif
#include "/lib/util/colorConversion.glsl"
#define AURORA_CONDITION 3 //[-1 0 1 2 3 4]
#define AURORA_COLOR_PRESET 0 //[-1 0 1 2 3 4 5 6 7 8 9 10 11 12 13 14] // 0 is manual and default, 1 is daily, 2 is monthly and 3 is one color preset same with all numbers after
#define AURORA_UP_R 112 //[0 4 8 12 16 20 24 28 32 36 40 44 48 52 56 60 64 68 72 76 80 84 88 92 96 100 104 108 112 116 120 124 128 132 136 140 144 148 152 156 160 164 168 172 176 180 184 188 192 196 200 204 208 212 216 220 224 228 232 236 240 244 248 252 255]
#define AURORA_UP_G 36 //[0 4 8 12 16 20 24 28 32 36 40 44 48 52 56 60 64 68 72 76 80 84 88 92 96 100 104 108 112 116 120 124 128 132 136 140 144 148 152 156 160 164 168 172 176 180 184 188 192 196 200 204 208 212 216 220 224 228 232 236 240 244 248 252 255]
#define AURORA_UP_B 192 //[0 4 8 12 16 20 24 28 32 36 40 44 48 52 56 60 64 68 72 76 80 84 88 92 96 100 104 108 112 116 120 124 128 132 136 140 144 148 152 156 160 164 168 172 176 180 184 188 192 196 200 204 208 212 216 220 224 228 232 236 240 244 248 252 255]
#define AURORA_UP_I 33 //[0 3 5 8 10 13 15 18 20 23 25 28 30 33 35 38 40 43 45 48 50 53 55 58 60 63 65 68 70 73 75 78 80 83 85 88 90 93 95 98 100]
#define AURORA_DOWN_R 96 //[0 4 8 12 16 20 24 28 32 36 40 44 48 52 56 60 64 68 72 76 80 84 88 92 96 100 104 108 112 116 120 124 128 132 136 140 144 148 152 156 160 164 168 172 176 180 184 188 192 196 200 204 208 212 216 220 224 228 232 236 240 244 248 252 255]
#define AURORA_DOWN_G 255 //[0 4 8 12 16 20 24 28 32 36 40 44 48 52 56 60 64 68 72 76 80 84 88 92 96 100 104 108 112 116 120 124 128 132 136 140 144 148 152 156 160 164 168 172 176 180 184 188 192 196 200 204 208 212 216 220 224 228 232 236 240 244 248 252 255]
#define AURORA_DOWN_B 192 //[0 4 8 12 16 20 24 28 32 36 40 44 48 52 56 60 64 68 72 76 80 84 88 92 96 100 104 108 112 116 120 124 128 132 136 140 144 148 152 156 160 164 168 172 176 180 184 188 192 196 200 204 208 212 216 220 224 228 232 236 240 244 248 252 255]
#define AURORA_DOWN_I 33 //[0 3 5 8 10 13 15 18 20 23 25 28 30 33 35 38 40 43 45 48 50 53 55 58 60 63 65 68 70 73 75 78 80 83 85 88 90 93 95 98 100]
#define AURORA_SIZE 1.00 //[0.00 0.05 0.10 0.15 0.20 0.25 0.30 0.35 0.40 0.45 0.50 0.55 0.60 0.65 0.70 0.75 0.80 0.85 0.90 0.95 1.00 1.05 1.10 1.15 1.20 1.25 1.30 1.35 1.40 1.45 1.50 1.55 1.60 1.65 1.70 1.75 1.80 1.85 1.90 1.95 2.00 2.05 2.10 2.15 2.20 2.25 2.30 2.35 2.40 2.45 2.50 2.55 2.60 2.65 2.70 2.75 2.80 2.85 2.90 2.95 3.00]
#define AURORA_DRAW_DISTANCE 0.65 //[0.00 0.05 0.10 0.15 0.20 0.25 0.30 0.35 0.40 0.45 0.50 0.55 0.60 0.65 0.70 0.75 0.80 0.85 0.90 0.95 1.00 1.05 1.10 1.15 1.20 1.25 1.30 1.35 1.40 1.45 1.50 1.55 1.60 1.65 1.70 1.75 1.80 1.85 1.90 1.95 2.00]
#define RANDOM_AURORA 0 //[0 1 2 3 4 5 6 7 8 9]
//#define RGB_AURORA
#define AURORA_CLOUD_INFLUENCE_INTENSITY 1.00 //[0.00 0.25 0.50 0.75 1.00 1.25 1.50 1.75 2.00 2.50 3.00]
#define AURORA_TERRAIN_INFLUENCE_INTENSITY 1.00 //[0.00 0.25 0.50 0.75 1.00 1.25 1.50]
#define AURORA_NOISE_SCALE 1.00 //[0.10 0.15 0.20 0.25 0.30 0.35 0.40 0.45 0.50 0.55 0.60 0.65 0.70 0.75 0.80 0.85 0.90 0.95 1.00 1.05 1.10 1.15 1.20 1.25 1.30 1.35 1.40 1.45 1.50 1.55 1.60 1.65 1.70 1.75 1.80 1.85 1.90 1.95 2.00 2.05 2.10 2.15 2.20 2.25 2.30 2.35 2.40 2.45 2.50 2.55 2.60 2.65 2.70 2.75 2.80 2.85 2.90 2.95 3.00 3.05 3.10 3.15 3.20 3.25 3.30 3.35 3.40 3.45 3.50 3.55 3.60 3.65 3.70 3.75 3.80 3.85 3.90 3.95 4.00 4.05 4.10 4.15 4.20 4.25 4.30 4.35 4.40 4.45 4.50 4.55 4.60 4.65 4.70 4.75 4.80 4.85 4.90 4.95 5.00]
#define AURORA_PATTERN_WARP 0 //[0 1 2 3 4 5 6 7 8 9 10]
#define AURORA_SATURATION 10 //[0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20]
#define AURORA_COLOR_MIX_POWER 2.0 //[0.5 1.0 1.5 2.0 2.5 3.0 3.5 4.0 4.5 5.0]
float GetAuroraVisibility(in float VdotU, float VdotUAmount) {
float visibility = sqrt1(clamp01(mix(1.0, VdotU, VdotUAmount) * (AURORA_DRAW_DISTANCE * 1.125 + 0.75) - 0.225)) - sunVisibility - maxBlindnessDarkness;
#ifdef CLEAR_SKY_WHEN_RAINING
visibility -= rainFactor * 0.5;
#else
visibility -= rainFactor;
#endif
visibility *= 1.0 - VdotU * 0.9 * VdotUAmount;
#if AURORA_CONDITION == 1 || AURORA_CONDITION == 3
visibility -= moonPhase;
#endif
#if AURORA_CONDITION == 2 || AURORA_CONDITION == 3
visibility *= inSnowy;
#endif
#if AURORA_CONDITION == 4
visibility = max(visibility * inSnowy, visibility - moonPhase);
#endif
#if AURORA_CONDITION == -1 // Always except new moon
visibility *= clamp01(max(moonPhase, 1) % 4);
#endif
#if RANDOM_AURORA > 0
float randomValue = hash11(float(worldDay));
if (randomValue > RANDOM_AURORA * 0.1) {
visibility = -1.0; // Disable aurora this day
}
#endif
return visibility;
}
vec3 auroraUpA[] = vec3[](
vec3(112.0, 36.0, 192.0), // [1] [2] Complementary
vec3(112.0, 80.0, 255.0), // [3] Legacy Complementary (v4)
vec3(168.0, 36.0, 88.0), // [4] permafrost
vec3(255.0, 68.0, 124.0), // [5] Blossoming Lights (Pink)
vec3(72.0, 96.0, 192.0), // [6] Nebula
vec3(24.0, 255.0, 140.0), // [7] Celestial Dance
vec3(255.0, 220.0, 255.0), // [8] Green Flash
vec3(64.0, 255.0, 255.0), // [9] Ethereal Lights
vec3(0.0, 20.0, 60.0), // [10] Glacial Blessing
vec3(132.0, 0.0, 200.0), // [11] Mythical Lights
vec3(120.0, 212.0, 56.0), // [12] watermelon
vec3(0.0, 255.0, 255.0), // [13] blood bath
vec3(255.0, 80.0, 112.0) // [14] Ghost
);
vec3 auroraDownA[] = vec3[](
vec3(96.0, 255.0, 192.0), // [1] [2] Complementary
vec3(80.0, 255.0, 180.0), // [3] Legacy Complementary (v4)
vec3(60.0, 184.0, 152.0), // [4] permafrost
vec3(160.0, 96.0, 255.0), // [5] Blossoming Lights (Pink)
vec3(172.0, 44.0, 88.0), // [6] Nebula
vec3(108.0, 72.0, 255.0), // [7] Celestial Dance
vec3(68.0, 255.0, 72.0), // [8] Green Flash
vec3(128.0, 64.0, 128.0), // [9] Ethereal Lights
vec3(0.0, 24.0, 36.0), // [10] Glacial Blessing
vec3(56.0, 168.0, 255.0), // [11] Mythical Lights
vec3(176.0, 88.0, 72.0), // [12] watermelon
vec3(180.0, 0.0, 0.0), // [13] blood bath
vec3(80.0, 255.0, 180.0) // [14] Ghost
);
vec2 warpAuroraCoords(vec2 coord, float warpAmount) {
float angle = texture2D(noisetex, coord * 0.5).r * 6.28318 * warpAmount;
float strength = texture2D(noisetex, coord * 0.7 + 0.5).r * warpAmount;
vec2 offset = vec2(cos(angle), sin(angle)) * strength;
return coord + offset;
}
void GetAuroraColor(in vec2 wpos, out vec3 auroraUp, out vec3 auroraDown) {
#ifdef RGB_AURORA
auroraUp = getRainbowColor(wpos, 0.06);
auroraDown = getRainbowColor(wpos, 0.05);
#elif AURORA_COLOR_PRESET == 0
auroraUp = vec3(AURORA_UP_R, AURORA_UP_G, AURORA_UP_B);
auroraDown = vec3(AURORA_DOWN_R, AURORA_DOWN_G, AURORA_DOWN_B);
#elif AURORA_COLOR_PRESET == -1
float randomValue = hash11(float(worldDay));
randomValue = pow(randomValue, 0.7); // Bias towards higher values (more transitions)
float transitionsPerNight = min(randomValue * 2.0, 1.75);
float idx, frac = modf(nightFactor * transitionsPerNight, idx);
int dayOffset = worldDay % auroraUpA.length();
int colorsCount = auroraUpA.length();
int i0 = (int(idx) + dayOffset) % colorsCount;
int i1 = (i0 + 1) % colorsCount;
// Interpolate in OKLab color space for perceptually uniform transitions
vec3 oklabUp0 = rgb2oklab(auroraUpA[i0] / 255.0);
vec3 oklabUp1 = rgb2oklab(auroraUpA[i1] / 255.0);
vec3 oklabDown0 = rgb2oklab(auroraDownA[i0] / 255.0);
vec3 oklabDown1 = rgb2oklab(auroraDownA[i1] / 255.0);
auroraUp = oklab2rgb(mix(oklabUp0, oklabUp1, frac)) * 255.0;
auroraDown = oklab2rgb(mix(oklabDown0, oklabDown1, frac)) * 255.0;
#else
#if AURORA_COLOR_PRESET == 1
int p = worldDay % auroraUpA.length();
#elif AURORA_COLOR_PRESET == 2
int p = worldDay % (auroraUpA.length() * 8) / 8;
#else
const int p = AURORA_COLOR_PRESET - 2;
#endif
auroraUp = auroraUpA[p];
auroraDown = auroraDownA[p];
#endif
auroraUp = max(auroraUp, vec3(0.001));
auroraDown = max(auroraDown, vec3(0.001));
auroraUp *= (AURORA_UP_I * 0.093 + 3.1) / GetLuminance(auroraUp);
auroraDown *= (AURORA_DOWN_I * 0.245 + 8.15) / GetLuminance(auroraDown);
#if AURORA_SATURATION != 10
auroraUp = rgb2hsv(auroraUp);
auroraUp.g *= AURORA_SATURATION * 0.1;
auroraUp = hsv2rgb(auroraUp);
auroraDown = rgb2hsv(auroraDown);
auroraDown.g *= AURORA_SATURATION * 0.1;
auroraDown = hsv2rgb(auroraDown);
#endif
}
vec3 getAuroraAmbientColor(vec3 color, vec3 viewPos, float multiplier, float influence, float VdotUAmount) {
float visibility = GetAuroraVisibility(0.5, VdotUAmount);
if (visibility > 0) {
vec3 wpos = (gbufferModelViewInverse * vec4(viewPos, 1.0)).xyz;
wpos.xz /= (abs(wpos.y) + length(wpos.xz));
vec3 auroraUp, auroraDown;
GetAuroraColor(wpos.xz, auroraUp, auroraDown);
vec3 auroraColor = mix(auroraUp, auroraDown, 0.8);
#ifdef COMPOSITE1
visibility *= influence;
return mix(color, auroraColor, visibility);
#endif
auroraColor *= multiplier;
visibility *= influence;
#ifdef DEFERRED1
return mix(color, saturateColors(auroraColor, 0.8) * visibility * 0.45, visibility);
#endif
float luminanceColor = GetLuminance(color);
vec3 newColor = mix(color, mix(color, vec3(luminanceColor), 0.88), visibility);
newColor *= mix(vec3(1.0), auroraColor * luminanceColor * 10.0, visibility);
return clamp01(newColor);
// return mix(color, color * auroraColor, visibility); // old, keep it for now
}
return color;
}
vec3 GetAuroraBorealis(vec3 viewPos, float VdotU, float dither) {
float visibility = GetAuroraVisibility(VdotU, 1.0);
if (visibility > 0.0) {
vec3 aurora = vec3(0.0);
vec3 wpos = mat3(gbufferModelViewInverse) * viewPos;
wpos.xz /= wpos.y;
vec2 cameraPositionM = cameraPosition.xz * 0.0075;
cameraPositionM.x += syncedTime * 0.04;
#ifdef DEFERRED1
int sampleCount = 25;
int sampleCountP = sampleCount + 5;
#else
int sampleCount = 10;
int sampleCountP = sampleCount + 10;
#endif
float ditherM = dither + 5.0;
float auroraAnimate = frameTimeCounter * 0.001;
vec3 auroraUp, auroraDown;
GetAuroraColor(wpos.xz, auroraUp, auroraDown);
for (int i = 0; i < sampleCount; i++) {
float current = pow2((i + ditherM) / sampleCountP);
vec2 planePos = wpos.xz * (AURORA_SIZE * 0.8 + current) * 11.0 * AURORA_NOISE_SCALE + cameraPositionM;
#if AURORA_STYLE == 1
planePos = floor(planePos) * 0.0007;
#if AURORA_PATTERN_WARP > 0
planePos = warpAuroraCoords(planePos, AURORA_PATTERN_WARP * 0.0057);
#endif
float noise = texture2DLod(noisetex, planePos, 0.0).b;
noise = pow2(pow2(pow2(pow2(1.0 - 2.0 * abs(noise - 0.5)))));
noise *= pow1_5(texture2DLod(noisetex, planePos * 100.0 + auroraAnimate, 0.0).b);
#else
planePos *= 0.0007;
#if AURORA_PATTERN_WARP > 0
planePos = warpAuroraCoords(planePos, AURORA_PATTERN_WARP * 0.0082);
#endif
float noise = texture2DLod(noisetex, planePos, 0.0).r;
noise = pow2(pow2(pow2(pow2(1.0 - 2.0 * abs(noise - 0.5)))));
noise *= texture2DLod(noisetex, planePos * 3.0 + auroraAnimate, 0.0).b;
noise *= texture2DLod(noisetex, planePos * 5.0 - auroraAnimate, 0.0).b;
#endif
float currentM = 1.0 - current;
aurora += noise * currentM * mix(auroraUp, auroraDown, pow(pow2(currentM), AURORA_COLOR_MIX_POWER));
}
#if AURORA_STYLE == 1
aurora *= 1.3;
#else
aurora *= 1.8;
#endif
#ifdef ATM_COLOR_MULTS
aurora *= sqrtAtmColorMult; // C72380KD - Reduced atmColorMult impact on some things
#endif
return aurora * visibility / sampleCount;
}
return vec3(0.0);
}
#endif
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