You cannot select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
117 lines
2.9 KiB
GLSL
117 lines
2.9 KiB
GLSL
// Author @patriciogv - 2015 - patriciogonzalezvivo.com
|
|
|
|
#ifdef GL_OES_standard_derivatives
|
|
#extension GL_OES_standard_derivatives : enable
|
|
#endif
|
|
|
|
#ifdef GL_ES
|
|
precision mediump float;
|
|
#endif
|
|
|
|
uniform vec2 u_resolution;
|
|
uniform vec2 u_mouse;
|
|
uniform float u_time;
|
|
|
|
vec2 skew (vec2 st) {
|
|
vec2 r = vec2(0.0);
|
|
r.x = 1.1547*st.x;
|
|
r.y = st.y+0.5*r.x;
|
|
return r;
|
|
}
|
|
|
|
vec3 simplexGrid (vec2 st) {
|
|
vec3 xyz = vec3(0.0);
|
|
|
|
vec2 p = fract(skew(st));
|
|
if (p.x > p.y) {
|
|
xyz.xy = 1.0-vec2(p.x,p.y-p.x);
|
|
xyz.z = p.y;
|
|
} else {
|
|
// xyz.yz = 1.0-vec2(p.x-p.y,p.y);
|
|
// xyz.x = p.x;
|
|
xyz.zx = 1.-vec2(p.x-p.y,p.y);
|
|
xyz.y = p.x;
|
|
}
|
|
|
|
return fract(xyz);
|
|
}
|
|
|
|
vec3 starS (vec3 S) {
|
|
S += max(dot(S.xxx,S.zzz),max(dot(S.yyy,S.xxx),dot(S.yyy,S.zzz)));
|
|
return S;
|
|
}
|
|
|
|
vec3 sakuraS (vec3 S) {
|
|
return S + min(dot(S.xxx,S.zzz),min(dot(S.yyy,S.xxx),dot(S.yyy,S.zzz)));
|
|
}
|
|
|
|
float warpDF (vec3 S) {
|
|
return dot(S.xy,S.yx);
|
|
}
|
|
|
|
float circleDF (vec3 S) {
|
|
return dot(S,S);
|
|
}
|
|
|
|
float triangleDF (vec3 S) {
|
|
S -= 1.04;
|
|
return abs(min(dot(S.zz,S.yy),min(dot(S.zz,S.xx),dot(S.xx,S.yy))));
|
|
}
|
|
|
|
float lotusDF (vec3 S, float petals_size, float roundness) {
|
|
S = 1.-(S)*petals_size; // above 1.
|
|
S = pow(S,vec3(roundness));
|
|
S = max(starS(S),sakuraS(S));
|
|
return 1.0-fract(triangleDF(S));
|
|
}
|
|
|
|
// Antialiazed Step function
|
|
// from http://webstaff.itn.liu.se/~stegu/webglshadertutorial/shadertutorial.html
|
|
float aastep(float threshold, float value) {
|
|
#ifdef GL_OES_standard_derivatives
|
|
float afwidth = 0.7 * length(vec2(dFdx(value), dFdy(value)));
|
|
return smoothstep(threshold-afwidth, threshold+afwidth, value);
|
|
#else
|
|
return step(threshold, value);
|
|
#endif
|
|
}
|
|
|
|
void main() {
|
|
vec2 st = gl_FragCoord.xy/u_resolution.xy;
|
|
st.x *= u_resolution.x/u_resolution.y;
|
|
vec3 color = vec3(0.0);
|
|
float t = smoothstep(0.,1.,abs(sin(u_time*0.4)));
|
|
|
|
// Scale the space to see the grid
|
|
st *= 1.733;
|
|
st *= 2.;
|
|
vec3 S = simplexGrid(st);
|
|
|
|
// Triangles
|
|
// ------------
|
|
// color += aastep(t,triangleDF(S));
|
|
// color += aastep(0.5,triangleDF(smoothstep(vec3(.3,.3,.7),vec3(1.),S)));
|
|
// color += aastep(0.99,triangleDF(pow(S,vec3(3.,3.,1.))));
|
|
// color += aastep(1.,triangleDF(S*20.));
|
|
// color += aastep(0.1,triangleDF(S*5.+dot(S,S)));
|
|
// color += aastep(t*.5,triangleDF(sakuraS(S)));
|
|
// color += aastep(-.1t*.2,triangleDF(starS(S)) );
|
|
// color += aastep(t,triangleDF(sakuraS(starS(S))));
|
|
color += aastep(t,triangleDF(starS(sakuraS(S))));
|
|
|
|
// Warp
|
|
// color += aastep(t,warpDF(sakuraS(S)));
|
|
// color += aastep(t,warpDF(starS(S)));
|
|
|
|
// Lotus
|
|
// -------------
|
|
// color += aastep(.5,lotusDF(S,2.12,0.001+t*0.6));
|
|
// color += aastep(.5,lotusDF(S,3.,.1+t*.1));
|
|
// color += aastep(.5,lotusDF(S,3.,.3+t*.2));
|
|
// color += aastep(.5,lotusDF(S,5.,.1+t*.1));
|
|
// color += aastep(.5,lotusDF(S,12.,.0001+t*.04));
|
|
|
|
|
|
|
|
gl_FragColor = vec4(color,1.0);
|
|
} |