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var tessy = (function initTesselator() {
// function called for each vertex of tesselator output
function vertexCallback(data, polyVertArray) {
// console.log(data[0], data[1]);
polyVertArray[polyVertArray.length] = data[0];
polyVertArray[polyVertArray.length] = data[1];
}
function begincallback(type) {
if (type !== libtess.primitiveType.GL_TRIANGLES) {
console.log('expected TRIANGLES but got type: ' + type);
}
}
function errorcallback(errno) {
console.log('error callback');
console.log('error number: ' + errno);
}
// callback for when segments intersect and must be split
function combinecallback(coords, data, weight) {
// console.log('combine callback');
return [coords[0], coords[1], coords[2]];
}
function edgeCallback(flag) {
// don't really care about the flag, but need no-strip/no-fan behavior
// console.log('edge flag: ' + flag);
}
var tessy = new libtess.GluTesselator();
// tessy.gluTessProperty(libtess.gluEnum.GLU_TESS_WINDING_RULE, libtess.windingRule.GLU_TESS_WINDING_POSITIVE);
tessy.gluTessCallback(libtess.gluEnum.GLU_TESS_VERTEX_DATA, vertexCallback);
tessy.gluTessCallback(libtess.gluEnum.GLU_TESS_BEGIN, begincallback);
tessy.gluTessCallback(libtess.gluEnum.GLU_TESS_ERROR, errorcallback);
tessy.gluTessCallback(libtess.gluEnum.GLU_TESS_COMBINE, combinecallback);
tessy.gluTessCallback(libtess.gluEnum.GLU_TESS_EDGE_FLAG, edgeCallback);
return tessy;
})();