playcanvas
Version:
PlayCanvas WebGL game engine
78 lines (76 loc) • 1.68 kB
JavaScript
class AnimBlend {
static dot(a, b) {
var len = a.length;
var result = 0;
for(var i = 0; i < len; ++i){
result += a[i] * b[i];
}
return result;
}
static normalize(a) {
var l = AnimBlend.dot(a, a);
if (l > 0) {
l = 1.0 / Math.sqrt(l);
var len = a.length;
for(var i = 0; i < len; ++i){
a[i] *= l;
}
}
}
static set(a, b, type) {
var len = a.length;
if (type === 'quaternion') {
var l = AnimBlend.dot(b, b);
if (l > 0) {
l = 1.0 / Math.sqrt(l);
}
for(var i = 0; i < len; ++i){
a[i] = b[i] * l;
}
} else {
for(var i1 = 0; i1 < len; ++i1){
a[i1] = b[i1];
}
}
}
static blendVec(a, b, t, additive) {
var it = additive ? 1.0 : 1.0 - t;
var len = a.length;
for(var i = 0; i < len; ++i){
a[i] = a[i] * it + b[i] * t;
}
}
static blendQuat(a, b, t, additive) {
var len = a.length;
var it = additive ? 1.0 : 1.0 - t;
if (AnimBlend.dot(a, b) < 0) {
t = -t;
}
for(var i = 0; i < len; ++i){
a[i] = a[i] * it + b[i] * t;
}
if (!additive) {
AnimBlend.normalize(a);
}
}
static blend(a, b, t, type, additive) {
if (type === 'quaternion') {
AnimBlend.blendQuat(a, b, t, additive);
} else {
AnimBlend.blendVec(a, b, t, additive);
}
}
static stableSort(a, lessFunc) {
var len = a.length;
for(var i = 0; i < len - 1; ++i){
for(var j = i + 1; j < len; ++j){
if (lessFunc(a[j], a[i])) {
var tmp = a[i];
a[i] = a[j];
a[j] = tmp;
}
}
}
}
}
export { AnimBlend };