50 lines
1.3 KiB
Text
50 lines
1.3 KiB
Text
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shader_type canvas_item;
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varying vec2 world_position;
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uniform vec4 color : source_color;
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uniform float radius = 3000;
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uniform float amplitude = 20;
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uniform float tsunami_size = 0;
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uniform float tsunami_angle = 0;
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void vertex() {
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world_position = (MODEL_MATRIX * vec4(VERTEX, 0.0, 1.0)).xy;
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}
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float wave_at(float angle) {
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float wave1 = amplitude/1. * sin(150. * angle + TIME);
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float wave2 = amplitude/2. * sin(90. * angle + 1.6 * TIME);
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float wave3 = amplitude/3. * sin(55. * angle + 2.3 * TIME);
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float wave4 = amplitude/4. * sin(35. * angle + 3.9 * TIME);
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return wave1 + wave2 + wave3 + wave4;
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}
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float tsunami_at(float angle) {
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float angle_diff = angle - tsunami_angle;
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angle_diff = mod(angle_diff + PI + TAU, TAU) - PI;
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float sinc = (sin(20. * angle_diff) / angle_diff/ 20.);
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float wave = pow(abs(sinc), 1.5) * tsunami_size * sign(sinc);
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return wave;
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}
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void fragment() {
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float angle = atan(world_position.y, world_position.x);
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float wave = wave_at(angle);
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float tsunami = tsunami_at(angle);
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if(length(world_position) < radius + wave + tsunami) {
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COLOR = color;
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} else {
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discard;
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}
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}
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//void light() {
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// // Called for every pixel for every light affecting the CanvasItem.
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// // Uncomment to replace the default light processing function with this one.
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//}
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