110 lines
2.7 KiB
Plaintext
110 lines
2.7 KiB
Plaintext
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shader_type sky;
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#include "res://vfx/util.gdshaderinc"
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const vec3 COLOR_DAY = vec3(0.0, 0.41, 0.8);
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const vec3 COLOR_TWILIGHT = vec3(1.0, 0.29, 0.0);
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const vec3 COLOR_NIGHT = vec3(0.01, 0.0, 0.03);
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const vec3 COLOR_CLOUDS_LIGHT = vec3(2.0);
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const vec3 COLOR_CLOUDS_HEAVY = vec3(0.25);
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const vec3 COLOR_STARS = vec3(1.0);
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const vec3 RADIANCE_DAY = vec3(0.625);
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const vec3 RADIANCE_TWILIGHT = COLOR_TWILIGHT/2.0;
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const vec3 RADIANCE_NIGHT = 3.0*COLOR_NIGHT;
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const float RADIANCE_OVERCAST = 0.875;
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uniform sampler2D cloud_map: TEXTURE_HINTS;
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uniform sampler2D star_map: TEXTURE_HINTS;
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uniform float night = 0.0;
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uniform float overcast = 0.25;
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uniform float windy = 0.25;
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uniform float bright = 0.25;
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uniform float twist = 0.0;
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uniform float psychedelic = 0.0;
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float index_cloud_map(vec2 uv) {
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return mix(texture(cloud_map, uv).r, 0.0, 2.0*abs(0.5 - uv.y))*overcast;
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}
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float index_star_map(vec2 uv) {
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return mix(texture(star_map, uv).r, 0.0, 2.0*abs(0.5 - uv.y));
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}
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vec4 clouds(vec2 uv) {
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float m = index_cloud_map(uv);
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return vec4(
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vec3(mix(
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COLOR_CLOUDS_LIGHT,
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COLOR_CLOUDS_HEAVY,
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overcast
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))*mix(1.0, 0.125, night)*(m + 3.0)/4.0,
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mix(m, 1.0,
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mix(overcast,
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overcast*overcast*overcast*overcast*overcast,
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night))
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);
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}
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vec4 stars(vec2 uv) {
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return vec4(COLOR_STARS, mix(0.0, index_star_map(uv), night))*bright*4.0;
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}
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vec4 psychedelic_overlay(vec2 uv) {
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return vec4(
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hsv2rgb(vec3(
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fract(uv.x),
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mix(0.5, 0.0, 2.0*(0.5 - uv.y)*(0.5 - uv.y)),
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2.0*abs(0.5 - uv.y)
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)).rgb,
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psychedelic
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);
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}
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vec3 bgcolor(float y) {
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vec3 top = mix(COLOR_DAY, COLOR_NIGHT, night);
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vec3 bottom = mix(top, COLOR_TWILIGHT, 1.0 - abs(0.5 - night)*2.0);
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return mix(top, bottom, y);
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}
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vec3 radiance() {
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return mix(
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mix(RADIANCE_DAY, RADIANCE_NIGHT, night),
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RADIANCE_TWILIGHT,
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0.5 - abs(0.5 - night)
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)*mix(1.0, RADIANCE_OVERCAST, overcast)*bright*4.0;
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}
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vec3 composite(vec2 uv) {
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float wind_factor = TIME*windy*windy*0.25;
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vec2 uv_after_twist = vec2(
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fract(uv.x + sin(TIME*uv.y*twist/180.0)),
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uv.y
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);
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vec2 uv_after_wind = vec2(fract(uv.x + wind_factor), uv.y);
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vec2 uv_after_both = vec2(
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fract(uv.x + sin(TIME*uv.y*twist/180.0) + wind_factor),
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uv.y
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);
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vec4 color = vec4(bgcolor(uv.y), 1.0);
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color = alpha_blend(stars(
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mix(mix(uv, uv_after_wind, psychedelic), uv_after_both, twist)
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), color);
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color = alpha_blend(clouds(uv_after_wind), color);
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//color = alpha_blend(psychedelic_overlay(uv_after_both), color);
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vec4 psych = psychedelic_overlay(uv_after_both);
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color = vec4(mix(color.rgb, mix(
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color.rgb*psych.rgb,
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color.rgb + psych.rgb,
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night
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), psych.a), 1.0);
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return color.rgb;
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}
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void sky() {
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vec2 uv = SKY_COORDS;
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if (AT_CUBEMAP_PASS) {
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COLOR = radiance();
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} else {
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COLOR = composite(uv);
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}
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}
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