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Beppe Vanrolleghem
2024-06-03 19:34:58 +02:00
parent 7bea59d29a
commit b0c3bfad0e
2 changed files with 40 additions and 5 deletions
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9
experiments/perlin/main.frag
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@@ -125,19 +125,18 @@ void main() {
st.x *= u_resolution.x/u_resolution.y;
st = st -.5;
st *= 2.;
// vec3 color = vec3(0.0,0.0,0.0);
float color = 0.;
float d = length(st);
float alpha = 1.0;
float s = u_time*8.;
float f_amount = 4.;
vec2 f_st = fract(st*f_amount);
f_st = rotate(f_st,dot(st,st)+(s*d));
f_st = rotate(f_st,sin(dot(f_st,f_st)+(s*dot(st,st))));
float t = triSDF(f_st);
//color += stroke(t, .5,.1);
color += stroke(t, .8,.2);
color *= pnoise(st*s, f_st*s)+.5;
color += stroke(t, 1.-(sin(dot(st,f_st)+s)*.5),.2);
color *= pnoise(st*s, f_st*s)*(sin(s)+2.);
gl_FragColor = vec4(vec3(color), alpha);
gl_FragColor = vec4(cosPalette(color), alpha);
}

36
learning/PixelSpirit/the_empress.frag Normal file
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@@ -0,0 +1,36 @@
#ifdef GL_ES
precision mediump float;
#endif
uniform vec2 u_resolution;
uniform vec2 u_mouse;
uniform float u_time;
#define PI 3.14159265359
const vec3 uAColor = vec3(.5,.5,.5);
const vec3 uBColor = vec3(.5,.5,.5);
const vec3 uCColor = vec3(1.,1.,1.);
const vec3 uDColor = vec3(.0,.33,.67);
//get colors from http://dev.thi.ng/gradients/
vec3 cosPalette(float t) { return uAColor + uBColor*cos(6.28318*(uCColor*t+uDColor)); }
float fill(float x, float size) { return 1.-step(size, x); }
float polySDF(vec2 st, float angles) {
st = st*2.-1.;
float a = atan(st.x,st.y)+PI;
float r = length(st);
float v = (2.*PI)/angles;
return cos(floor(.5+a/v)*v-a)*r;
}
void main() {
vec2 st = gl_FragCoord.xy/u_resolution;
vec3 color = vec3(0.0,0.0,0.0);
float alpha = 1.0;
color += fill(polySDF(st, 5),.3);
gl_FragColor = vec4(color, alpha);
}