Rakarake/glonkers
1
0
Fork 0
Code Issues Pull requests Projects Releases Packages Wiki Activity Actions

nice wavey pattern

Browse source
This commit is contained in:
Rakarake 2025-12-27 16:46:33 +01:00
parent d5829527c1
commit 1e0c44cc3d
1 changed files with 22 additions and 11 deletions
Download patch file Download diff file Expand all files Collapse all files

33
fragment.glsl
View file

@ -29,14 +29,15 @@ float rand(vec2 v, vec2 offset) {
return float(hash) * (1.0/float(0xffffffffu));
}
float cell_size = 0.01;
float cell_size = 0.04;
#define PI 3.1415926538
// whatever that corner contributes
float c_dot(vec2 point, vec2 corner) {
// vector_offset and angle_offset are optional variation variables
float c_dot(vec2 point, vec2 corner, vec2 vector_offset, float angle_offset) {
vec2 c = vec2(ivec2(round(corner * 100.0)));
float angle = rand(c, vec2(0.0, 0.0)) * 2.0*PI;
vec2 random_corner_vec = vec2(cos(angle), sin(angle));
float angle = rand(c, vec2(0.0, 0.0)) * 2.0*PI + angle_offset;
vec2 random_corner_vec = vec2(cos(angle), sin(angle)) + vector_offset;
vec2 offset = (point - corner) / cell_size;
float dot_product = dot(random_corner_vec, offset);
// for now just return something
@ -48,17 +49,17 @@ float fade(float t) {
return ((6.0*t - 15.0)*t + 10.0)*t*t*t;
}
float perlin_noise(vec2 uv) {
float perlin_noise(vec2 uv, vec2 vector_offset, float angle_offset) {
vec2 grid_edge_offset = mod(uv, cell_size);
// c: corner
vec2 c_tl = uv - grid_edge_offset;
vec2 c_tr = uv - grid_edge_offset + vec2(cell_size, 0);
vec2 c_bl = uv - grid_edge_offset + vec2(0, cell_size);
vec2 c_br = uv - grid_edge_offset + vec2(cell_size, cell_size);
float c_tl_dot = c_dot(uv, c_tl);
float c_tr_dot = c_dot(uv, c_tr);
float c_bl_dot = c_dot(uv, c_bl);
float c_br_dot = c_dot(uv, c_br);
float c_tl_dot = c_dot(uv, c_tl, vector_offset, angle_offset);
float c_tr_dot = c_dot(uv, c_tr, vector_offset, angle_offset);
float c_bl_dot = c_dot(uv, c_bl, vector_offset, angle_offset);
float c_br_dot = c_dot(uv, c_br, vector_offset, angle_offset);
// the uv within the tile (0 to 1)
vec2 tile_uv = (uv - c_tl) / cell_size;
@ -76,6 +77,16 @@ void main() {
// We'll make origin in the top-left.
uv.y = 1.0 - uv.y;
uv.x *= WindowSize.x / WindowSize.y;
float out_val = perlin_noise(uv);
color = vec4(out_val, out_val, out_val, 1.0);
uv.y += sin(uv.x * 2.0 + time * 0.2) * 0.47;
uv.y += sin(uv.x * 4.3 + time * 1.34) * 0.09;
uv += 100.0;
//uv.x += time / 20.0;
float out_val = perlin_noise(uv, vec2(0.0, 0.0), time / 1.0);
float min = 0.42;
float max = 0.58;
out_val = out_val + sin(uv.y + time) / 15.2;
out_val = clamp(out_val, min, max);
out_val -= min;
out_val *= (1.0 - (max - min)) / (max - min);
color = vec4(out_val, 0.4, 0.8, 1.0);
}