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Pavel Dobryakov
2017-08-08 17:30:29 +03:00
parent 72d30d2854
commit 9cd5dcbd66
1 changed files with 14 additions and 7 deletions
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21
script.js
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@@ -192,21 +192,28 @@ const advectionShader = compileShader(gl.FRAGMENT_SHADER, `
uniform float dt;
uniform float dissipation;
// https://github.com/mharrys/fluids-2d/blob/master/shaders/advect.fs
vec4 bilerp (sampler2D sam, vec2 p)
{
vec2 res = 1.0 / wh_inv.xy;
// vec2 st = p * res - 0.5;
// vec2 iuv = floor(st);
// vec2 fuv = fract(st);
vec4 st;
st.xy = floor(p - 0.5) + 0.5;
st.zw = st.xy + 1.0;
vec4 uv = st / res.xyxy;
vec2 f = p - floor(p);
p = floor(p);
vec4 a = texture2D(sam, p);
vec4 b = texture2D(sam, p + vec2(wh_inv.x, 0.0));
vec4 c = texture2D(sam, p + vec2(0.0, wh_inv.y));
vec4 d = texture2D(sam, p + wh_inv.xy);
// vec2 f = p - floor(p);
// p = floor(p);
vec4 a = texture2D(sam, uv.xy);
vec4 b = texture2D(sam, uv.zy);
vec4 c = texture2D(sam, uv.xw);
vec4 d = texture2D(sam, uv.zw);
vec2 f = p - st.xy;
return mix(mix(a, b, f.x), mix(c, d, f.x), f.y);
}