generated from krampus/template-godot4
53 lines
1.6 KiB
Plaintext
53 lines
1.6 KiB
Plaintext
/* Speed Lines effect
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* Adapted from https://godotshaders.com/shader/speed-lines-shader-for-godot-4/
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*/
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shader_type canvas_item;
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uniform sampler2D noise: repeat_enable;
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uniform float line_count: hint_range(0.0, 2.0, 0.05) = 0.5;
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uniform float line_density: hint_range(0.0, 1.0) = 0.5;
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uniform float line_falloff: hint_range(0.0, 1.0) = 0.25;
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uniform float mask_size: hint_range(0.0, 1.0) = 0.1;
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uniform float mask_edge: hint_range(0.0, 1.0) = 0.5;
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uniform float animation_speed: hint_range(1.0, 20.0) = 0.5;
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uniform sampler2D screen_texture: hint_screen_texture;
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float inv_lerp(float from, float to, float value) {
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return (value - from) / (to - from);
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}
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vec2 polar_coordinates(vec2 uv, vec2 center, float zoom, float repeat) {
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vec2 dir = uv - center;
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float radius = length(dir) * 2.0;
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float angle = atan(dir.y, dir.x) * 1.0 / (PI * 2.0);
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return mod(vec2(radius * zoom, angle * repeat), 1.0);
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}
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vec2 rotate_uv(vec2 uv, vec2 pivot, float rotation) {
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float cosa = cos(rotation);
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float sina = sin(rotation);
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uv -= pivot;
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return vec2(
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cosa * uv.x - sina * uv.y,
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cosa * uv.y + sina * uv.x
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) + pivot;
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}
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void fragment() {
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vec2 polar_uv = polar_coordinates(rotate_uv(UV, vec2(0.5), floor(fract(TIME) * animation_speed)), vec2(0.5), 0.01, line_count);
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vec3 lines = texture(noise, polar_uv).rgb;
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float mask_value = length(UV - vec2(0.5));
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float mask = inv_lerp(mask_size, mask_edge, mask_value);
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float result = 1.0 - (mask * line_density);
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result = smoothstep(result, result + line_falloff, lines.r);
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vec3 screen_color = texture(screen_texture, SCREEN_UV).rgb;
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COLOR.rgb = 1.0 - screen_color.rgb;
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COLOR.a = min(1.0, result);
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}
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