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#include "client/pch.hh"
#include "client/entity/interpolation.hh"
#include "core/math/constexpr.hh"
#include "shared/entity/head.hh"
#include "shared/entity/transform.hh"
#include "shared/world/dimension.hh"
#include "shared/coord.hh"
#include "client/globals.hh"
static void transform_interpolate(float alpha)
{
auto group = globals::dimension->entities.group<entity::client::TransformIntr>(
entt::get<entity::Transform, entity::client::TransformPrev>);
for(auto [entity, interp, current, previous] : group.each()) {
interp.angles[0] = math::lerp(previous.angles[0], current.angles[0], alpha);
interp.angles[1] = math::lerp(previous.angles[1], current.angles[1], alpha);
interp.angles[2] = math::lerp(previous.angles[2], current.angles[2], alpha);
// Figure out previous chunk-local floating-point coordinates transformed
// to the current WorldCoord's chunk domain coordinates; we're interpolating
// against these instead of using previous.position.local to prevent jittering
auto previous_shift = coord::to_relative(current.chunk, current.local, previous.chunk, previous.local);
auto previous_local = current.local + previous_shift;
interp.chunk.x = current.chunk.x;
interp.chunk.y = current.chunk.y;
interp.chunk.z = current.chunk.z;
interp.local.x = math::lerp(previous_local.x, current.local.x, alpha);
interp.local.y = math::lerp(previous_local.y, current.local.y, alpha);
interp.local.z = math::lerp(previous_local.z, current.local.z, alpha);
}
}
static void head_interpolate(float alpha)
{
auto group = globals::dimension->entities.group<entity::client::HeadIntr>(entt::get<entity::Head, entity::client::HeadPrev>);
for(auto [entity, interp, current, previous] : group.each()) {
interp.angles[0] = math::lerp(previous.angles[0], current.angles[0], alpha);
interp.angles[1] = math::lerp(previous.angles[1], current.angles[1], alpha);
interp.angles[2] = math::lerp(previous.angles[2], current.angles[2], alpha);
interp.offset.x = math::lerp(previous.offset.x, current.offset.x, alpha);
interp.offset.y = math::lerp(previous.offset.y, current.offset.y, alpha);
interp.offset.z = math::lerp(previous.offset.z, current.offset.z, alpha);
}
}
void entity::interpolation::update(void)
{
if(globals::dimension) {
auto alpha = static_cast<float>(globals::fixed_accumulator) / static_cast<float>(globals::fixed_frametime_us);
transform_interpolate(alpha);
head_interpolate(alpha);
}
}
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