47 lines
1.7 KiB
GLSL
47 lines
1.7 KiB
GLSL
precision mediump float;
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uniform sampler2D noise_sparse;
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uniform sampler2D noise_fine;
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uniform vec2 iResolution;
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uniform float scroll_speed;
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uniform float warp_boost;
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uniform float warp_opacity;
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uniform float time;
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const float noise_sparse_scale = 0.0007;
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const float noise_fine_scale = 0.003;
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const float warp_clouds_scale = 0.0003;
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const vec2 scroll_dir = vec2(1,0);
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const vec2 blink_scroll = vec2(50.0, 0);
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const float PI = 3.1415;
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void main() {
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vec2 uv=gl_FragCoord.xy/iResolution.xy;
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float scroll = scroll_speed * time;
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float sparse = texture2D(noise_sparse, (gl_FragCoord.xy + scroll_dir * scroll)*noise_sparse_scale).r;
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sparse = ((sparse * sparse) - 0.2) * 1.2;
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float fine = texture2D(noise_fine, (gl_FragCoord.xy + scroll_dir * scroll)*noise_fine_scale).r;
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fine = fine - 0.6;
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if (fine > 0.) {
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fine = fine * 10.0;
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}
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if (fine > 0.3) {
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float fine_blink_fade = texture2D(noise_sparse, (gl_FragCoord.xy + blink_scroll*time)*noise_sparse_scale).r;
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fine = fine - ((fine_blink_fade * fine_blink_fade) - 0.2) * 1.2;
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}
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vec4 clouds = vec4(vec3(0.3, 0.5, 0.7) * sparse, 1.0);
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vec4 stars = vec4(fine);
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vec2 warp_scroll = scroll_dir * scroll;
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vec2 warp_uv = (gl_FragCoord.xy * sin(uv.y * PI) + warp_scroll)*warp_clouds_scale;
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vec2 warp_uv_inv = (gl_FragCoord.xy * sin((abs(uv.y-0.5)) * uv.x * PI) + warp_scroll*0.5)*warp_clouds_scale;
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float warp_clouds_sparse = texture2D(noise_sparse, vec2(0.5,1) * warp_uv).r;
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float warp_clouds_fine = texture2D(noise_sparse, vec2(2,1) * warp_uv_inv).r;
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vec4 warp = vec4(vec3(0), 1);
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warp += vec4(vec3(0.3,0.2,0.9)*warp_clouds_sparse, 0);
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warp += vec4(vec3(0.5,0.0,0.5)*(warp_clouds_fine*0.5+warp_clouds_sparse)*abs(uv.y-0.5), 0);
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gl_FragColor = mix(clouds + stars, warp*warp_boost, warp_opacity);
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} |