ashima/webgl-noise
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Fixed 4D seaming bug.

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This commit is contained in:
ijm 2011-02-27 04:00:57 -08:00
parent 126ff001c2
commit 1962580737
1 changed files with 8 additions and 5 deletions
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13
noise.glsl
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@ -198,9 +198,12 @@ float simplexNoise4(vec4 v)
vec4 x0 = v - i + dot(i, C.xxxx); vec4 x0 = v - i + dot(i, C.xxxx);
// Other corners // Other corners
// Force existance of strict total ordering in sort.
vec4 q0 = floor(x0 * 1024.0) + vec4( 0., 1./4., 2./4. , 3./4.);
vec4 q1; vec4 q1;
q1.xy = max(x0.xy,x0.zw); // x:z y:w q1.xy = max(q0.xy,q0.zw); // x:z y:w
q1.zw = min(x0.xy,x0.zw); q1.zw = min(q0.xy,q0.zw);
vec4 q2; vec4 q2;
q2.xz = max(q1.xz,q1.yw); // x:y z:w q2.xz = max(q1.xz,q1.yw); // x:y z:w
@ -211,9 +214,9 @@ float simplexNoise4(vec4 v)
q3.z = min(q2.y,q2.z); q3.z = min(q2.y,q2.z);
q3.xw = q2.xw; q3.xw = q2.xw;
vec4 i1 = vec4(equal(q3.xxxx, x0)); vec4 i1 = vec4(lessThanEqual(q3.xxxx, q0));
vec4 i2 = i1 + vec4(equal(q3.yyyy, x0)); vec4 i2 = vec4(lessThanEqual(q3.yyyy, q0));
vec4 i3 = i2 + vec4(equal(q3.zzzz, x0)); vec4 i3 = vec4(lessThanEqual(q3.zzzz, q0));
// x0 = x0 - 0. + 0. * C // x0 = x0 - 0. + 0. * C
vec4 x1 = x0 - i1 + 1. * C.xxxx; vec4 x1 = x0 - i1 + 1. * C.xxxx;