41 lines
1004 B
Plaintext
41 lines
1004 B
Plaintext
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shader_type canvas_item;
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uniform vec4 bottom_color: source_color = vec4(1.0);
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uniform vec4 top_color: source_color = vec4(vec3(0.0), 1.0);
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uniform sampler2D tex;
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uniform int layer_count: hint_range(2, 80, 1);
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uniform float time_scale: hint_range(0.0, 1.0) = 0.2;
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uniform float base_intensity: hint_range(0.0, 1.0) = 0.5;
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uniform float size: hint_range(0.00001, 1.0) = 0.1;
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vec4 lerp(vec4 a, vec4 b, float w) {
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return a + w * (b - a);
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}
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float fmod(float x, float y) {
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return x - floor(x / y) * y;
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}
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float rand(float n){return fract(sin(n) * 43758.5453123);}
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bool cloud_layer(float x, float y, float h) {
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return y - sqrt((1.0 - pow(y - h, 2.0))) * base_intensity * texture(tex, vec2(fmod(x / size + rand(h), 1.0), fmod(y / size - TIME * time_scale, 1.0))).r < h;
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}
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void fragment() {
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float y = 1.0 - UV.y;
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for (int i = 0; i < layer_count; i++) {
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float h = float(i) / float(layer_count - 1);
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if (cloud_layer(UV.x, y, h)) {
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COLOR = lerp(bottom_color, top_color, h);
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break;
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}
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}
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}
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