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.
67 lines
1.3 KiB
GLSL
67 lines
1.3 KiB
GLSL
// Title: Marx
|
|
// Author Leo Coogan - 2025 - existential.beauty
|
|
// Based on: https://thebookofshaders.com/edit.php#11/simplex-grid.frag
|
|
// Author @patriciogv - 2015 - patriciogonzalezvivo.com
|
|
|
|
#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 = r.x+0.5*st.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;
|
|
}
|
|
|
|
return fract(xyz);
|
|
}
|
|
|
|
void main() {
|
|
vec2 st = gl_FragCoord.xy/u_resolution.xy;
|
|
vec3 color = vec3(0.0);
|
|
|
|
// Scale the space to see the grid
|
|
st *= 30. + u_mouse * sin(0.0001 + u_time );
|
|
|
|
// Show the 2D grid
|
|
color.rb = abs(st * sin(st.y));
|
|
color.rg = fract(st * sin(st.x * 0.1));
|
|
|
|
|
|
|
|
// Skew the 2D grid
|
|
//color.rg = fract(skew(st));
|
|
|
|
// Subdivide the grid into to equilateral triangles
|
|
//color = simplexGrid(st);
|
|
|
|
// vec3 pos = vec3(st*5.0,u_time*0.5);
|
|
|
|
// color = vec3(cnoise(pos));
|
|
// vec4 ixy = permute(permute(ix) + iy);
|
|
|
|
|
|
|
|
gl_FragColor = vec4(color,1.0);
|
|
}
|
|
|