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parser:: ../ for spline interpolation

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This commit is contained in:
Zeno Rogue 2020-04-09 08:09:11 +02:00
parent 64914067dc
commit ac6548684c
1 changed files with 31 additions and 5 deletions
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36
util.cpp
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@ -64,6 +64,10 @@ EX ld lerp(ld a0, ld a1, ld x) {
return a0 + (a1-a0) * x;
}
EX cld lerp(cld a0, cld a1, ld x) {
return a0 + (a1-a0) * x;
}
EX ld ilerp(ld a0, ld a1, ld x) {
return (x-a0) / (a1-a0);
}
@ -340,21 +344,43 @@ cld exp_parser::parse(int prio) {
while(true) {
#if CAP_ANIMATIONS
if(next() == '.' && next(1) == '.' && prio == 0) {
vector<pair<cld, cld>> rest = { {res, res} };
static const cld NO_DERIVATIVE(3.1, 2.5);
vector<array<cld, 4>> rest = { make_array(res, NO_DERIVATIVE, res, NO_DERIVATIVE) };
bool second = true;
while(next() == '.' && next(1) == '.') {
if(next(2) == '|') {
/* spline interpolation */
if(next(2) == '/') {
at += 3;
rest.back().second = parse(10);
rest.back()[second ? 3 : 1] = parse(10);
continue;
}
/* sharp end */
else if(next(2) == '|') {
at += 3;
rest.back()[2] = parse(10);
rest.back()[3] = NO_DERIVATIVE;
second = true;
}
at += 2;
auto val = parse(10);
rest.emplace_back(val, val);
rest.emplace_back(make_array(val, NO_DERIVATIVE, val, NO_DERIVATIVE));
second = false;
}
ld v = ticks * (isize(rest)-1.) / anims::period;
int vf = v;
v -= vf;
vf %= (isize(rest)-1);
res = rest[vf].second + (rest[vf+1].first - rest[vf].second) * v;
auto& lft = rest[vf];
auto& rgt = rest[vf+1];
if(lft[3] == NO_DERIVATIVE && rgt[1] == NO_DERIVATIVE)
res = lerp(lft[2], rgt[0], v);
else if(rgt[1] == NO_DERIVATIVE)
res = lerp(lft[2] + lft[3] * v, rgt[0], v*v);
else if(lft[3] == NO_DERIVATIVE)
res = lerp(lft[2], rgt[0] + rgt[1] * (v-1), (2-v)*v);
else {
res = lerp(lft[2] + lft[3] * v, rgt[0] + rgt[1] * (v-1), v*v*(3-2*v));
}
return res;
}
else