64 lines
2.5 KiB
Plaintext
64 lines
2.5 KiB
Plaintext
shader_type sky;
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#include "res://addons/rokojori_action_library/Runtime/Shading/Library/Math.gdshaderinc"
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#include "res://addons/rokojori_action_library/Runtime/Shading/Library/Transform.gdshaderinc"
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#include "res://addons/rokojori_action_library/Runtime/Shading/Library/Noise.gdshaderinc"
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uniform int vertical_sections = 21;
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uniform float star_size = 0.02;
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uniform float star_falloff = 4.;
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uniform float margin = 0.05; // How far the star is from the edge of it's section. Avoids artifacts at the edge of sections.
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uniform sampler2D verticalColor: source_color;
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uniform float starOpacity = 0;
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uniform float starsNoiseScale = 1;
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uniform vec3 starsNoiseOffset =vec3(0,0,0);
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uniform float starsNoiseScale2 = 1;
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uniform vec3 starsNoiseOffset2 =vec3(0,0,0);
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uniform float starsOverlayOpacity = 0.1;
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uniform float starsOverlayOffset = -0.5;
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vec2 get_partition( vec2 sky_coords )
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{
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// Separate the sphere into sections of roughly equal width and height.
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float y = sky_coords.y * 2. - 1.;
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float section_y = ceil(abs(y) * float(vertical_sections)) / float(vertical_sections);
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float horizontal_sections = max(4., ceil(float(vertical_sections) * 4. * cos(section_y * PI / 2.)));
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horizontal_sections = horizontal_sections > 0. ? horizontal_sections : 1.;
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return vec2(sky_coords.x * horizontal_sections, y * float(vertical_sections));
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}
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vec2 rand_vec2(vec2 xy)
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{
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float rand1 = fract(sin(dot(xy, vec2(11.9131, 81.2317))) * 57183.77193);
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float rand2 = fract(sin(dot(xy, vec2(16.8131, 91.2327))) * 37113.66193);
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return vec2(rand1, rand2) * ( 1. - margin * 2.) + margin;
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}
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float star_brightness(vec2 sky_coords)
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{
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vec2 partitions = get_partition(sky_coords);
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vec2 partition_index = floor(partitions);
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vec2 inner_coord = fract(partitions);
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vec2 star_coord = rand_vec2(partition_index);
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float dist = length(inner_coord - star_coord);
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return pow(star_size / dist, star_falloff);
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}
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void sky()
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{
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float stars = clamp( star_brightness( SKY_COORDS )/1000.0,0, 1);
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float starsLight = perlin3D( ( starsNoiseOffset * TIME + EYEDIR.xzy ) * starsNoiseScale );
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float starsLight2 = perlin3D( ( starsNoiseOffset2 * TIME + EYEDIR.xzy ) * starsNoiseScale2 );
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starsLight2 = clamp( starsLight2 + starsOverlayOffset, 0,1 ) * starsOverlayOpacity;
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COLOR = stars* starOpacity * starsLight + texture( verticalColor, SKY_COORDS ).rgb + starsLight2;
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//COLOR = vec3(1,1,1) * ( starsLight );
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//float angleXZ = mod( atan( EYEDIR.z, EYEDIR.x ), PI * 2.0 );
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//COLOR = vec3( angleXZ / ( PI * 2.0 ), 0, 0 );
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// vec3( star_brightness( SKY_COORDS ) );
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}
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