/* Copyright 2000, Silicon Graphics, Inc. All Rights Reserved. Copyright 2015, Google Inc. All Rights Reserved. Permission is hereby granted, free of charge, to any person obtaining a copy of this software and associated documentation files (the "Software"), to deal in the Software without restriction, including without limitation the rights to use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of the Software, and to permit persons to whom the Software is furnished to do so, subject to the following conditions: The above copyright notice including the dates of first publication and either this permission notice or a reference to http://oss.sgi.com/projects/FreeB/ shall be included in all copies or substantial portions of the Software. THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL SILICON GRAPHICS, INC. BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE. Original Code. The Original Code is: OpenGL Sample Implementation, Version 1.2.1, released January 26, 2000, developed by Silicon Graphics, Inc. The Original Code is Copyright (c) 1991-2000 Silicon Graphics, Inc. Copyright in any portions created by third parties is as indicated elsewhere herein. All Rights Reserved. */ 'use strict';var n;function t(a,b){return a.b===b.b&&a.a===b.a}function u(a,b){return a.ba?0:a;c=0>c?0:c;return a<=c?0===c?(b+d)/2:b+a/(a+c)*(d-b):d+c/(a+c)*(b-d)};function ea(a){var b=B(a.b);C(b,a.c);C(b.b,a.c);D(b,a.a);return b}function E(a,b){var c=!1,d=!1;a!==b&&(b.a!==a.a&&(d=!0,F(b.a,a.a)),b.d!==a.d&&(c=!0,G(b.d,a.d)),H(b,a),d||(C(b,a.a),a.a.c=a),c||(D(b,a.d),a.d.a=a))}function I(a){var b=a.b,c=!1;a.d!==a.b.d&&(c=!0,G(a.d,a.b.d));a.c===a?F(a.a,null):(a.b.d.a=J(a),a.a.c=a.c,H(a,J(a)),c||D(a,a.d));b.c===b?(F(b.a,null),G(b.d,null)):(a.d.a=J(b),b.a.c=b.c,H(b,J(b)));fa(a)} function K(a){var b=B(a),c=b.b;H(b,a.e);b.a=a.b.a;C(c,b.a);b.d=c.d=a.d;b=b.b;H(a.b,J(a.b));H(a.b,b);a.b.a=b.a;b.b.a.c=b.b;b.b.d=a.b.d;b.f=a.f;b.b.f=a.b.f;return b}function L(a,b){var c=!1,d=B(a),e=d.b;b.d!==a.d&&(c=!0,G(b.d,a.d));H(d,a.e);H(e,b);d.a=a.b.a;e.a=b.a;d.d=e.d=a.d;a.d.a=e;c||D(d,a.d);return d}function B(a){var b=new M,c=new M,d=a.b.h;c.h=d;d.b.h=b;b.h=a;a.b.h=c;b.b=c;b.c=b;b.e=c;c.b=b;c.c=c;return c.e=b}function H(a,b){var c=a.c,d=b.c;c.b.e=b;d.b.e=a;a.c=d;b.c=c} function C(a,b){var c=b.f,d=new N(b,c);c.e=d;b.f=d;c=d.c=a;do c.a=d,c=c.c;while(c!==a)}function D(a,b){var c=b.d,d=new ga(b,c);c.b=d;b.d=d;d.a=a;d.c=b.c;c=a;do c.d=d,c=c.e;while(c!==a)}function fa(a){var b=a.h;a=a.b.h;b.b.h=a;a.b.h=b}function F(a,b){var c=a.c,d=c;do d.a=b,d=d.c;while(d!==c);c=a.f;d=a.e;d.f=c;c.e=d}function G(a,b){var c=a.a,d=c;do d.d=b,d=d.e;while(d!==c);c=a.d;d=a.b;d.d=c;c.b=d};function ha(a){var b=0;Math.abs(a[1])>Math.abs(a[0])&&(b=1);Math.abs(a[2])>Math.abs(a[b])&&(b=2);return b};var O=4*1E150;function P(a,b){a.f+=b.f;a.b.f+=b.b.f}function ia(a,b,c){a=a.a;b=b.a;c=c.a;if(b.b.a===a)return c.b.a===a?u(b.a,c.a)?0>=x(c.b.a,b.a,c.a):0<=x(b.b.a,c.a,b.a):0>=x(c.b.a,a,c.a);if(c.b.a===a)return 0<=x(b.b.a,a,b.a);b=v(b.b.a,a,b.a);a=v(c.b.a,a,c.a);return b>=a}function Q(a){a.a.i=null;var b=a.e;b.a.c=b.c;b.c.a=b.a;a.e=null}function ja(a,b){I(a.a);a.c=!1;a.a=b;b.i=a}function ka(a){var b=a.a.a;do a=R(a);while(a.a.a===b);a.c&&(b=L(S(a).a.b,a.a.e),ja(a,b),a=R(a));return a} function la(a,b,c){var d=new ma;d.a=c;d.e=na(a.f,b.e,d);return c.i=d}function oa(a,b){switch(a.s){case 100130:return 0!==(b&1);case 100131:return 0!==b;case 100132:return 0b;case 100134:return 2<=b||-2>=b}return!1}function pa(a){var b=a.a,c=b.d;c.c=a.d;c.a=b;Q(a)}function T(a,b,c){a=b;for(b=b.a;a!==c;){a.c=!1;var d=S(a),e=d.a;if(e.a!==b.a){if(!d.c){pa(a);break}e=L(b.c.b,e.b);ja(d,e)}b.c!==e&&(E(J(e),e),E(b,e));pa(a);b=d.a;a=d}return b} function U(a,b,c,d,e,f){var g=!0;do la(a,b,c.b),c=c.c;while(c!==d);for(null===e&&(e=S(b).a.b.c);;){d=S(b);c=d.a.b;if(c.a!==e.a)break;c.c!==e&&(E(J(c),c),E(J(e),c));d.f=b.f-c.f;d.d=oa(a,d.f);b.b=!0;!g&&qa(a,b)&&(P(c,e),Q(b),I(e));g=!1;b=d;e=c}b.b=!0;f&&ra(a,b)}function sa(a,b,c,d,e){var f=[b.g[0],b.g[1],b.g[2]];b.d=null;b.d=a.o?a.o(f,c,d,a.c)||null:null;null===b.d&&(e?a.n||(V(a,100156),a.n=!0):b.d=c[0])} function ta(a,b,c){var d=[null,null,null,null];d[0]=b.a.d;d[1]=c.a.d;sa(a,b.a,d,[.5,.5,0,0],!1);E(b,c)}function ua(a,b,c,d,e){var f=Math.abs(b.b-a.b)+Math.abs(b.a-a.a),g=Math.abs(c.b-a.b)+Math.abs(c.a-a.a),h=e+1;d[e]=.5*g/(f+g);d[h]=.5*f/(f+g);a.g[0]+=d[e]*b.g[0]+d[h]*c.g[0];a.g[1]+=d[e]*b.g[1]+d[h]*c.g[1];a.g[2]+=d[e]*b.g[2]+d[h]*c.g[2]} function qa(a,b){var c=S(b),d=b.a,e=c.a;if(u(d.a,e.a)){if(0=l?W(c,l):u(h[g[l>>1]],h[g[l]])?W(c,l):va(c,l));h[f]=null;k[f]=c.b;c.b=f}else for(c.c[-(f+1)]=null;0x(d.b.a,e.a,d.a))return!1;R(b).b=b.b=!0;K(d.b);E(J(e),d)}return!0} function wa(a,b){var c=S(b),d=b.a,e=c.a,f=d.a,g=e.a,h=d.b.a,k=e.b.a,l=new N;x(h,a.a,f);x(k,a.a,g);if(f===g||Math.min(f.a,h.a)>Math.max(g.a,k.a))return!1;if(u(f,g)){if(0x(h,g,f))return!1;var r=h,p=f,q=k,y=g,m,w;u(r,p)||(m=r,r=p,p=m);u(q,y)||(m=q,q=y,y=m);u(r,q)||(m=r,r=q,q=m,m=p,p=y,y=m);u(q,p)?u(p,y)?(m=v(r,q,p),w=v(q,p,y),0>m+w&&(m=-m,w=-w),l.b=A(m,q.b,w,p.b)):(m=x(r,q,p),w=-x(r,y,p),0>m+w&&(m=-m,w=-w),l.b=A(m,q.b,w,y.b)):l.b=(q.b+p.b)/2;z(r,p)||(m=r,r=p,p=m);z(q,y)|| (m=q,q=y,y=m);z(r,q)||(m=r,r=q,q=m,m=p,p=y,y=m);z(q,p)?z(p,y)?(m=aa(r,q,p),w=aa(q,p,y),0>m+w&&(m=-m,w=-w),l.a=A(m,q.a,w,p.a)):(m=ba(r,q,p),w=-ba(r,y,p),0>m+w&&(m=-m,w=-w),l.a=A(m,q.a,w,y.a)):l.a=(q.a+p.a)/2;u(l,a.a)&&(l.b=a.a.b,l.a=a.a.a);r=u(f,g)?f:g;u(r,l)&&(l.b=r.b,l.a=r.a);if(t(l,f)||t(l,g))return qa(a,b),!1;if(!t(h,a.a)&&0<=x(h,a.a,l)||!t(k,a.a)&&0>=x(k,a.a,l)){if(k===a.a)return K(d.b),E(e.b,d),b=ka(b),d=S(b).a,T(a,S(b),c),U(a,b,J(d),d,d,!0),!0;if(h===a.a){K(e.b);E(d.e,J(e));f=c=b;g=f.a.b.a; 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