54 lines
2.5 KiB
Plaintext
54 lines
2.5 KiB
Plaintext
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shader_type sky;
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uniform float star_size: hint_range(50.0, 500.0) = 120.0;
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uniform sampler2D star_colors: hint_default_white;
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uniform sampler2D sky_gradient: hint_default_black, repeat_disable;
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uniform sampler2D nebula_gradient: hint_default_black, repeat_disable;
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uniform float nebula_offset;
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uniform sampler2D universe_background: hint_default_black;
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// https://github.com/Norrox/GodotShaders/blob/master/Shaders/Voronoi-Worley/Voronoi.shader
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vec3 RNGV3(vec3 p) {
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vec3 a = fract(vec3(p.x, p.y, p.z) * vec3(111.11,333.33,444.44));
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a += dot(a, a+33.51);
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return fract(vec3(a.x*a.y, a.y*a.z, a.z*a.x)); //outputs a random vec2 between 0 and 1
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}
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vec4 voronoy(vec3 loc, float scale){
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loc = loc*scale;
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vec4 output = vec4(0., 0., 0., 10.);
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for(float y=-1.; y<=1.; y++){
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for(float x=-1.; x<=1.; x++){
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for(float z=-1.; z<=1.; z++){
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vec3 offs = vec3(x,y,z);
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vec3 n = RNGV3(floor(loc)+offs)*2.0-1.0;
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vec3 p = offs+sin(n) * .5;
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float d = length((fract(loc)-0.5)-p);
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if(d<output.q){
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vec3 rng = RNGV3(floor(loc)+offs);
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output = vec4(rng.x, rng.y, rng.z, d);
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}
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}
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}
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}
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return output;
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}
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void sky() {
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vec4 star_noise = voronoy(EYEDIR, star_size);
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vec3 stars = pow(max((0.25-star_noise.q)*4.0, 0), 0.3) * texture(star_colors, vec2(star_noise.x)).xyz * pow(star_noise.z, 2.2);
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stars *= float(star_noise.y*4.0 < pow(texture(universe_background, SKY_COORDS).z, 2.0));
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stars *= (0.7 + sin(TIME*(star_noise.z*1.5+0.2)) * 0.5);
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vec2 moving_noise = (texture(universe_background, SKY_COORDS + TIME * vec2(0.001, .0)).xy - 0.5) * 0.1;
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COLOR = pow(texture(sky_gradient, pow(moving_noise + EYEDIR.yy, vec2(0.8))).xyz, vec3(2.2));
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vec4 nebula = texture(nebula_gradient, //selecting the correct color
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pow(vec2(texture(universe_background, SKY_COORDS).z), vec2(0.8+nebula_offset)) * nebula_offset //setting the base gradient
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* 1.5 * texture(universe_background, -SKY_COORDS + TIME * vec2(0.001, 0) + moving_noise).xy // adding distortion
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);
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//COLOR += pow(texture(nebula_gradient, vec2(texture(universe_background, SKY_COORDS).z + nebula_offset * texture(universe_background, -SKY_COORDS + TIME * vec2(0.0005, 0) + moving_noise).z + 0.1)).xyz, vec3(2.0));
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COLOR = COLOR * (1.0-nebula.q) + nebula.xyz + stars;
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//COLOR = texture(universe_background, SKY_COORDS).zzz;
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}
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