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//go:build ignore
//kage:unit pixels
package main
var Time float
var Ex float
var Ey float
func height(uv vec2) float {
return imageSrc0UnsafeAt(uv).b*imageSrc0UnsafeAt((uv+vec2(0.0,Time*0.1))*imageSrc0Size()).b;
}
func normal(uv vec2) vec3 {
NE := vec2(0.05,0.0);
return normalize(vec3(height(uv+NE.xy)-height(uv-NE.xy),
0.0,
height(uv+NE.yx)-height(uv-NE.yx)));
}
func Fragment(dstPos vec4, srcPos vec2, color vec4) vec4 {
//lightDir := normalize(vec3(10.0,15.0,5.0));
uv := srcPos / imageSrc0Size()
//uv.y *= imageSrc0Size().y/imageSrc0Size().x;
dist := length(uv);
angle := atan(uv.y/uv.x);
ruv := uv;
uv = vec2(cos(angle+dist*3.),dist+(Time*0.2));
//h := height(uv);
norm := normal(uv);
return mix(vec4(0.), mix(
imageSrc0UnsafeAt(uv),
imageSrc0UnsafeAt((norm.xz*0.5+0.5)*imageSrc0Size()),0.3),min(1.,length(ruv)*10.));
}
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