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Approximate sea HScroll

This commit is contained in:
Luke Hubmayer-Werner 2023-07-28 17:01:24 +09:30
parent 17523985bd
commit 544ca5be0b
1 changed files with 9 additions and 2 deletions
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11
shaders/worldmap_shader.gdshader
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@ -27,9 +27,16 @@ vec2 get_tile_atlas_uv(float tile_id, vec2 uv) {
if (all(greaterThanEqual(out_uv, sea_tile_uv)) && all(lessThan(out_uv, sea_tile_uv_end))) {
vec2 sea_tile_uv_diff = out_uv - sea_tile_uv;
vec2 pos = sea_tile_uv_diff * sea_tile_size_inv;
// Silly warpy effects
// pos.x = fract(pos.x + fract(TIME*0.4) + cos(pos.y*0.5) + 20.0*sin(uv.y*20.0));
pos.x = fract(pos.x + fract(TIME*0.4) + 20.0*sin(uv.y*20.0));
pos.y = fract(pos.y + 0.5*sin(sin(TIME*0.5 + 32.0*uv.x)));
// pos.x = fract(pos.x + fract(TIME*0.4) + 20.0*sin(uv.y*20.0));
// pos.y = fract(pos.y + 0.5*sin(sin(TIME*0.5 + 32.0*uv.x)));
// Real animation seems to scroll in a cycle of shift row 1px, next frame, increment by 9 rows, shift that one, repeat
// i.e. every 16 frames it will have scrolled all rows 1px
// every 256 frames it will have performed a full scroll
// At 60fps this is one full scroll every 4.266... seconds
pos.x = fract(pos.x - TIME/4.267 + (pos.y * (9.0/16.0)));
out_uv = mix(sea_tile_uv, sea_tile_uv_end, pos);
}
// TODO: waterfall VScroll UV modulation