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webgl-noise
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removed div by zero error. clean up.

master
ijm 2011-03-15 19:07:00 -07:00
parent 5e7b0cadc7
commit d907d3daaa
1 changed files with 11 additions and 11 deletions
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22
noise.glsl
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@ -186,12 +186,12 @@ float simplexNoise3(vec3 v)
dot(p2,x2), dot(p3,x3) ) );
}
vec4 grad4(float j, vec4 ip, float iw)
vec4 grad4(float j, vec4 ip)
{
const vec4 ones = vec4(1.,1.,1.,-1.);
vec4 p,s;
p.xyz = floor( fract (vec3(j) * ip.xyz) *pParam.w) * iw -1.0;
p.xyz = floor( fract (vec3(j) * ip.xyz) *pParam.w) * ip.z -1.0;
p.w = 1.5 - dot(abs(p.xyz), ones.xyz);
s = vec4(lessThan(p,vec4(0.)));
p.xyz = p.xyz + (s.xyz*2.-1.) * s.www;
@ -246,16 +246,16 @@ float simplexNoise4(vec4 v)
+ i.x + vec4(i1.x, i2.x, i3.x, 1. ), pParam.xyz);
// Gradients
// ( N*N*N points uniformly over a cube, mapped onto a 4-octohedron.)
vec4 ip = 1.0 / vec4(pParam.w*pParam.w*pParam.w,
pParam.w*pParam.w,
pParam.w,0.);
float iw = 2.0 * ip.z ;
vec4 ip = pParam ;
ip.xy *= pParam.w ;
ip.x *= pParam.w ;
ip = vec4(1.,1.,1.,2.) / ip ;
vec4 p0 = grad4(j0, ip, iw);
vec4 p1 = grad4(j1.x, ip, iw);
vec4 p2 = grad4(j1.y, ip, iw);
vec4 p3 = grad4(j1.z, ip, iw);
vec4 p4 = grad4(j1.w, ip, iw);
vec4 p0 = grad4(j0, ip);
vec4 p1 = grad4(j1.x, ip);
vec4 p2 = grad4(j1.y, ip);
vec4 p3 = grad4(j1.z, ip);
vec4 p4 = grad4(j1.w, ip);
#ifdef NORMALISE_GRADIENTS
p0 *= taylorInvSqrt(dot(p0,p0));