mirror of
https://github.com/marinho/godot-visual-effects.git
synced 2024-12-22 14:37:27 +08:00
62 lines
1.9 KiB
Plaintext
62 lines
1.9 KiB
Plaintext
shader_type canvas_item;
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uniform sampler2D SCREEN_TEXTURE : hint_screen_texture, filter_linear_mipmap;
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uniform float speed : hint_range(0.0, 5.0) = .5;
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uniform float strength : hint_range(0.0, 1.0) = .5;
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uniform float intensity : hint_range(0.0, 1.0) = .5;
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uniform float distortionStrength : hint_range(0.0, 20.0) = 5.0;
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uniform int maximumIterations : hint_range(0, 10) = 5;
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uniform bool showTiling = false;
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uniform bool showYellowLine = false;
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// based on: https://www.shadertoy.com/view/MdlXz8
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#define TAU 6.28318530718
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void fragment() {
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float time = TIME * speed + 23.0;
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// uv should be the 0-1 uv of texture...
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vec2 iResolution = 1.0 / SCREEN_PIXEL_SIZE;
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vec2 uv = FRAGCOORD.xy / iResolution.xy;
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vec2 p;
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if (showTiling) {
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p = mod(uv*TAU*2.0, TAU) - 250.0;
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} else {
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p = mod(uv*TAU, TAU) - 250.0;
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}
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vec2 i = vec2(p);
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float c = 1.0;
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float inten = intensity / 100.0;
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for (int n = 0; n < maximumIterations; n++)
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{
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float t = time * (1.0 - (3.5 / float(n+1)));
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i = p + vec2(cos(t - i.x) + sin(t + i.y), sin(t - i.y) + cos(t + i.x));
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c += 1.0/length(vec2(p.x / (sin(i.x+t)/inten),p.y / (cos(i.y+t)/inten)));
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}
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c /= float(maximumIterations);
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c = 1.17-pow(c, 1.4);
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vec3 colorBase = vec3(pow(abs(c), 8.0));
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vec3 colour = clamp(colorBase + vec3(0.0, 0.35, 0.5), 0.0, 1.0);
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if (showTiling) {
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// Flash tile borders...
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vec2 pixel = 2.0 / iResolution.xy;
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uv *= 2.0;
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float f = floor(mod(TIME * speed, 2.0)); // Flash value.
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vec2 first = step(pixel, uv) * f; // Rule out first screen pixels and flash.
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uv = step(fract(uv), pixel); // Add one line of pixels per tile.
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if (showYellowLine)
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colour = mix(colour, vec3(1.0, 1.0, 0.0), (uv.x + uv.y) * first.x * first.y); // Yellow line
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}
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vec4 pixelColor = textureLod(SCREEN_TEXTURE, UV, colorBase.r * distortionStrength);
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vec3 appliedColor = mix(pixelColor.rgb, colour, strength);
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COLOR = vec4(appliedColor, 1.0);
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}
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