mirror of
https://github.com/marinho/godot-visual-effects.git
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54 lines
1.3 KiB
Plaintext
54 lines
1.3 KiB
Plaintext
shader_type canvas_item;
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#include "res://shaders/trigonometry.gdshaderinc"
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uniform sampler2D SCREEN_TEXTURE : hint_screen_texture, filter_linear_mipmap;
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// based on: https://godotshaders.com/shader/2d-radial-distortion-fisheye-barrel/
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/////////////////////////////////
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// 2D Radial Distortion Shader //
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/////////////////////////////////
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// Screen space shader for Godot, based on: https://gist.github.com/aggregate1166877/a889083801d67917c26c12a98e7f57a7
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uniform float aspect = 1.0;
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uniform float distortion = 1.0;
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uniform float radius = 1.0;
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uniform float alpha = 1.0;
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uniform float crop = 1.0;
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uniform vec4 crop_color : source_color = vec4(.0,.0,.0,1.0);
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vec2 distort(vec2 p)
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{
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float d = length(p);
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float z = sqrt(distortion + d * d * -distortion);
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float r = atan(d, z) / 3.1415926535;
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float phi = atan(p.y, p.x);
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return vec2(r * cos(phi) * (1.0 / aspect) + 0.5, r * sin(phi) + 0.5);
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}
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void fragment()
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{
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vec2 xy = (SCREEN_UV * 2.0 - 1.0); // move origin of UV coordinates to center of screen
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xy = vec2(xy.x * aspect, xy.y); // adjust aspect ratio
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float d = length(xy); // distance from center
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vec4 tex;
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if (d < radius)
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{
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xy = distort(xy);
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tex = texture(SCREEN_TEXTURE, xy);
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COLOR = tex;
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COLOR.a = alpha;
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}
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// radial crop
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if (d > crop)
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{
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COLOR = crop_color;
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}
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} |