File size: 6,384 Bytes
3ce1a40 | 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 | #include "animation.h"
#include "../serialization/stream.h"
#include <algorithm>
#include <cmath>
namespace unify {
float Track::sample(float t) const {
if (keys.empty()) return 0;
if (t <= keys.front().time) return keys.front().value;
if (t >= keys.back().time) return keys.back().value;
auto it = std::upper_bound(keys.begin(), keys.end(), t, [](float x, const Keyframe& k) { return x < k.time; });
const Keyframe& b = *it;
const Keyframe& a = *(it - 1);
float span = b.time - a.time;
return span > 0 ? a.value + (b.value - a.value) * ((t - a.time) / span) : b.value;
}
float AnimationClip::length() const {
float frames_len = 0;
for (auto& f : frames) frames_len += f.duration;
float track_len = 0;
for (auto& t : tracks) if (!t.keys.empty()) track_len = std::max(track_len, t.keys.back().time);
return std::max(frames_len, track_len);
}
void AnimationSystem::add_clip(AnimationClip c) { clips_[c.name] = std::move(c); }
const AnimationClip* AnimationSystem::clip(const std::string& name) const {
auto it = clips_.find(name);
return it == clips_.end() ? nullptr : &it->second;
}
uint32_t AnimationSystem::create_player(const std::string& clip) {
uint32_t id;
if (!free_.empty()) { id = free_.back(); free_.pop_back(); }
else { id = uint32_t(players_.size()); players_.emplace_back(); live_.push_back(0); }
players_[id] = AnimationPlayer{};
players_[id].clip = clip;
live_[id] = 1;
return id + 1; // 0 means "no player"
}
bool AnimationSystem::destroy_player(uint32_t id) {
if (id == 0 || id > players_.size() || !live_[id - 1]) return false;
live_[id - 1] = 0;
free_.push_back(id - 1);
return true;
}
AnimationPlayer* AnimationSystem::player(uint32_t id) {
return (id == 0 || id > players_.size() || !live_[id - 1]) ? nullptr : &players_[id - 1];
}
size_t AnimationSystem::live_players() const { return size_t(std::count(live_.begin(), live_.end(), 1)); }
void AnimationSystem::play(uint32_t id, const std::string& name, float blend_seconds, bool restart) {
AnimationPlayer* p = player(id);
if (!p) return;
if (p->clip == name && !restart) return;
if (blend_seconds > 0) {
p->from_clip = p->clip;
p->from_time = p->time;
p->blend = 0;
p->blend_duration = blend_seconds;
} else {
p->from_clip.clear();
p->blend = 1;
}
p->clip = name;
p->time = 0;
p->finished = false;
}
// Maps an unbounded play time into clip time according to the play mode.
float AnimationSystem::wrap(const AnimationClip& c, float t, bool* finished) {
float len = c.length();
if (len <= 0) return 0;
switch (c.mode) {
case PlayMode::Once:
if (t >= len) { if (finished) *finished = true; return len; }
return t;
case PlayMode::Loop: return std::fmod(t, len);
case PlayMode::PingPong: {
float m = std::fmod(t, 2 * len);
return m <= len ? m : 2 * len - m;
}
}
return t;
}
void AnimationSystem::advance(float dt) {
for (size_t i = 0; i < players_.size(); i++) {
if (!live_[i]) continue;
AnimationPlayer& p = players_[i];
const AnimationClip* c = clip(p.clip);
if (!c) continue;
if (!p.finished) {
p.time += dt * p.speed;
if (c->mode == PlayMode::Once && p.time >= c->length()) { p.time = c->length(); p.finished = true; }
// Keep loop time bounded so float precision does not degrade over long sessions.
if (c->mode == PlayMode::Loop && c->length() > 0) p.time = std::fmod(p.time, c->length());
if (c->mode == PlayMode::PingPong && c->length() > 0) p.time = std::fmod(p.time, 2 * c->length());
}
if (p.blend < 1) {
p.from_time += dt * p.speed;
p.blend = p.blend_duration > 0 ? std::min(1.0f, p.blend + dt / p.blend_duration) : 1.0f;
if (p.blend >= 1) p.from_clip.clear();
}
}
}
uint32_t AnimationSystem::sprite_region(uint32_t id) const {
const AnimationPlayer* p = const_cast<AnimationSystem*>(this)->player(id);
if (!p) return 0;
const AnimationClip* c = clip(p->clip);
if (!c || c->frames.empty()) return 0;
float t = wrap(*c, p->time, nullptr);
float acc = 0;
for (auto& f : c->frames) {
acc += f.duration;
if (t < acc) return f.region;
}
return c->frames.back().region;
}
float AnimationSystem::value(uint32_t id, const std::string& property, float fallback) const {
const AnimationPlayer* p = const_cast<AnimationSystem*>(this)->player(id);
if (!p) return fallback;
auto sample = [&](const std::string& name, float time, bool& found) {
const AnimationClip* c = clip(name);
if (!c) return fallback;
for (auto& tr : c->tracks)
if (tr.property == property) { found = true; return tr.sample(wrap(*c, time, nullptr)); }
return fallback;
};
bool found_to = false, found_from = false;
float to = sample(p->clip, p->time, found_to);
if (p->blend >= 1 || p->from_clip.empty()) return to;
float from = sample(p->from_clip, p->from_time, found_from);
if (!found_to && !found_from) return fallback;
return from + (to - from) * p->blend;
}
void AnimationSystem::serialize(BinaryWriter& w) const {
w.u32(uint32_t(players_.size()));
for (size_t i = 0; i < players_.size(); i++) {
w.u8(live_[i]);
if (!live_[i]) continue;
const AnimationPlayer& p = players_[i];
w.str(p.clip); w.f32(p.time); w.f32(p.speed); w.boolean(p.finished);
w.str(p.from_clip); w.f32(p.from_time); w.f32(p.blend); w.f32(p.blend_duration);
}
w.u32(uint32_t(free_.size()));
for (uint32_t f : free_) w.u32(f);
}
void AnimationSystem::deserialize(BinaryReader& r) {
uint32_t n = r.u32();
players_.assign(n, AnimationPlayer{});
live_.assign(n, 0);
for (uint32_t i = 0; i < n; i++) {
live_[i] = r.u8();
if (!live_[i]) continue;
AnimationPlayer& p = players_[i];
p.clip = r.str(); p.time = r.f32(); p.speed = r.f32(); p.finished = r.boolean();
p.from_clip = r.str(); p.from_time = r.f32(); p.blend = r.f32(); p.blend_duration = r.f32();
}
free_.resize(r.u32());
for (auto& f : free_) f = r.u32();
}
} // namespace unify
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