Rakarake/glonkers
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Rakarake 2025-12-12 16:30:24 +01:00
parent 589386fd63
commit 8ea152a924
1 changed files with 8 additions and 6 deletions
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14
fragment.glsl
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@ -3,7 +3,7 @@ out vec4 FragColor;
uniform vec2 WindowSize;
uniform float time;
float rand(vec2 co){
float rand(ivec2 co) {
return fract(sin(dot(co, vec2(12.9898, 78.233))) * 43758.5453);
}
@ -13,7 +13,8 @@ float cell_size = 0.1;
// whatever that corner contributes
float c_dot(vec2 point, vec2 corner) {
float angle = rand(corner) * 2*PI;
ivec2 c = ivec2(round(corner * 10000));
float angle = rand(c) * 2*PI;
vec2 random_corner_vec = vec2(cos(angle), sin(angle));
vec2 offset = (point - corner) / cell_size;
float dot_product = dot(random_corner_vec, offset);
@ -25,6 +26,7 @@ float lerp(float a, float b, float x) {
return a + x*(b-a);
}
// better than built in smoothstep.
float fade(float t) {
return ((6*t - 15)*t + 10)*t*t*t;
}
@ -48,12 +50,12 @@ void main() {
vec2 tile_uv = (uv - c_tl) / cell_size;
// lerp index
//float u = fade(tile_uv.x);
//float v = fade(tile_uv.y);
float u = fade(tile_uv.x);
float v = fade(tile_uv.y);
//float u = tile_uv.x;
//float v = tile_uv.y;
float u = smoothstep(0, 1, tile_uv.x);
float v = smoothstep(0, 1, tile_uv.y);
//float u = smoothstep(0, 1, tile_uv.x);
//float v = smoothstep(0, 1, tile_uv.y);
//float val = smoothstep(tile_uv.x, smoothstep(tile_uv.y, c_bl_dot, c_tl_dot), smoothstep(tile_uv.y, c_br_dot, c_tr_dot));
float val = lerp(lerp(c_tl_dot, c_bl_dot, v), lerp(c_tr_dot, c_br_dot, v), u);
//float val = tile_uv.y;