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tighter packing

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This commit is contained in:
Robin Appelman 2020-10-10 01:12:04 +02:00
commit 84187ebb6a
4 changed files with 1895 additions and 1618 deletions
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16
src/state.rs
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@ -79,7 +79,7 @@ pub struct PlayerState {
impl PlayerState {
const PACKET_SIZE: usize = 8;
pub fn pack(&self, world: &World) -> [u8; 8] {
pub fn pack(&self, world: &World) -> [u8; 7] {
// for the purpose of viewing the demo in the browser we dont really need high accuracy for
// position or angle, so we save a bunch of space by truncating those down to half the number
// of bits
@ -90,21 +90,25 @@ impl PlayerState {
let x = pack_f32(self.position.x, world.boundary_min.x, world.boundary_max.x).to_le_bytes();
let y = pack_f32(self.position.y, world.boundary_min.y, world.boundary_max.y).to_le_bytes();
let team_and_class = ((self.team as u8) << 4) + self.class as u8;
let health_bytes = self.health.to_le_bytes();
// 2 bits for team
// 4 bits for class
// 10 bits for health
let team_class_health =
((self.team as u16) << 14) + ((self.class as u16) << 10) + self.health;
let combined_bytes = team_class_health.to_le_bytes();
[
x[0],
x[1],
y[0],
y[1],
health_bytes[0],
health_bytes[1],
combined_bytes[0],
combined_bytes[1],
self.angle.0,
team_and_class,
]
}
#[allow(dead_code)]
pub fn unpack(bytes: [u8; 8], world: &World) -> Self {
fn unpack_f32(val: u16, min: f32, max: f32) -> f32 {
let ratio = val as f32 / (u16::max_value() as f32);