From 1d1407646881c4f6b8d41f4d634a12acee7e3041 Mon Sep 17 00:00:00 2001 From: irrlicht Date: Fri, 18 Sep 2026 23:40:52 +0200 Subject: [PATCH] Drop the chunk palette; chunks are plain u16 tile arrays MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit The 64-entry per-chunk palette was a wire-format artifact and capped a chunk at 64 distinct tiles. A Chunk is now Box<[u16; 1024]> with flags derived from the id on lookup — the same layout a binary on-disk format would use. Map path becomes the first CLI argument; assets/map_large is a generated 256×256 stress map (loads in ~0.5 ms release). The snapshot test takes SNAPSHOT_MAP. Co-Authored-By: Claude Opus 5 --- assets/map_large | 256 +++++++++++++++++++++++++++++++++++++++++ game/src/game.rs | 18 +-- game/src/main.rs | 4 +- notes/07-map-loader.md | 10 +- notes/roadmap.md | 6 +- sim/src/chunk.rs | 91 ++++----------- sim/src/lib.rs | 14 +-- sim/src/map.rs | 6 +- sim/src/sim.rs | 10 +- sim/src/world.rs | 6 +- 10 files changed, 317 insertions(+), 104 deletions(-) create mode 100644 assets/map_large diff --git a/assets/map_large b/assets/map_large new file mode 100644 index 0000000..dbfb0bc --- /dev/null +++ b/assets/map_large @@ -0,0 +1,256 @@ 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start() -> Self { + pub fn start(map_path: &str) -> Self { let tileset = Image::from_png("assets/tilesets/overworld.png").to_tileset(); let entity_tileset = Image::from_png("assets/tilesets/entities.png").to_tileset(); - let map = TileMap::from_csv("assets/map_test"); - println!("loaded map {}×{} ({} tiles)", map.width, map.height, map.tiles.len()); - let mut sim = Sim::new(load_world(&map)); + let t0 = std::time::Instant::now(); + let map = TileMap::from_csv(map_path); + let world = load_world(&map); + println!("loaded {map_path}: {}×{} tiles in {:.1} ms", + map.width, map.height, t0.elapsed().as_secs_f64() * 1e3); + let mut sim = Sim::new(world); let player_id = sim.world.spawn_entity(0, (0, 0), 100); let mut game = Game { @@ -338,7 +341,7 @@ impl Game { let (ccx, ccy) = sim::world::tile_to_chunk(wx as i16, wy as i16); let (lx, ly) = sim::world::tile_to_local(wx as i16, wy as i16); let tile_id = self.sim.world.chunk(ccx, ccy) - .map(|c| c.get_tile(lx, ly).tile_id) + .map(|c| c.get_tile(lx, ly)) .unwrap_or(0); let px = sx + vx * TILE_PX; let py = sy + vy * TILE_PX; @@ -389,13 +392,14 @@ impl Game { #[cfg(test)] mod snapshot { /// Renders the first frame headlessly to the PNG named by `$SNAPSHOT` — a way to - /// eyeball the renderer without a window: + /// eyeball the renderer without a window. `$SNAPSHOT_MAP` picks the map: /// `SNAPSHOT=/tmp/frame.png cargo test -p game snapshot -- --ignored` #[test] #[ignore] fn dump_frame() { std::env::set_current_dir("..").unwrap(); - let mut g = super::Game::start(); + let map = std::env::var("SNAPSHOT_MAP").unwrap_or_else(|_| "assets/map_test".into()); + let mut g = super::Game::start(&map); let input = crate::input::InputState::new(); let mut frame = vec![0u16; 320 * 240]; g.update(&mut frame, 0, &input); diff --git a/game/src/main.rs b/game/src/main.rs index 045c7bf..6e8584b 100755 --- a/game/src/main.rs +++ b/game/src/main.rs @@ -19,7 +19,9 @@ fn main() { let input_map = input::InputMap::new(); let mut input_state = input::InputState::new(); let mut last_update = Instant::now(); - let mut game = game::Game::start(); + // Optional map path: `game assets/map_large`. + let map_path = std::env::args().nth(1).unwrap_or_else(|| "assets/map_test".into()); + let mut game = game::Game::start(&map_path); while !plat.should_close() { plat.poll_events(Some(Duration::from_millis(20))); diff --git a/notes/07-map-loader.md b/notes/07-map-loader.md index 9ded346..22f797a 100644 --- a/notes/07-map-loader.md +++ b/notes/07-map-loader.md @@ -38,7 +38,7 @@ therefore shows up in the CSV as a large *negative* decimal when read as `i32`. The loader parses each field as `i64`, reinterprets the low 32 bits as `u32`, and strips the flip flags with `& 0x1FFF_FFFF`, leaving the bare tile id. **Flip orientation is discarded for now** — flipped tiles render unflipped. Real flipping would need a flip-aware `blit_tile` plus -the flags carried through the chunk palette; deferred to the camera/sprite pass (09). +a flip flag next to the tile id in the chunk; deferred to the camera/sprite pass (09). --- @@ -57,8 +57,12 @@ No `firstgid` subtraction: the authored ids already line up with `overworld.png` ## World assembly -`load_world` slices the map into 32×32 chunks via `Chunk::generate`, which builds each chunk's -6-bit palette automatically. The map's top-left tile sits at world (0, 0). +`load_world` slices the map into 32×32 chunks via `Chunk::generate`. A chunk is a plain +`[u16; 1024]` of tile ids; flags are derived from the id on lookup (`map::tile_flags`). That +array is also the natural on-disk layout should chunks ever be streamed from disk (RLE over +the `u16`s would do) — the CSV stays the interchange format for external tooling. The map's +top-left tile sits at world (0, 0). Loading a 256×256 map takes well under a millisecond in +release; the map path is the game's first CLI argument (`game assets/map_large`). **Edge border:** a 30×30 map only fills part of chunk (0,0) (which spans tiles 0–31). Tiles inside a loaded chunk but outside the authored map are emitted as an *invisible solid border* diff --git a/notes/roadmap.md b/notes/roadmap.md index 7d08e5b..f81d69f 100755 --- a/notes/roadmap.md +++ b/notes/roadmap.md @@ -24,8 +24,10 @@ crate's `tick`/`set_action` interface is the seam a server could be wrapped arou - [x] Pixel helpers: `set_pixel`, `extract`, `blit`, `blit_tile` in `game/src/game/pixelhelper.rs` — signed `i32` offsets, clip against all four framebuffer edges, per-tile opacity mask - [x] Input system: `GameAction`, `InputMap`, `InputState` in `game/src/input.rs` (over `pbio::Key`) -- [x] World model: `World` of 32×32 palette-compressed `Chunk`s (64-entry `TileDef` palette, - 6-bit tile indices), entities indexed per chunk, `entities_in_viewport` +- [x] World model: `World` of 32×32 `Chunk`s (plain `[u16; 1024]` tile ids, flags derived + on lookup — the network-era 64-entry palette is gone), entities indexed per chunk, + `entities_in_viewport`. Map path is the first CLI argument; `assets/map_large` is a + generated 256×256 stress map - [x] Map loader: Tiled-CSV parser in `sim/src/map.rs` (flip-flag masking, content-derived dimensions), `load_world` slices it into chunks, invisible solid border at the map rim. See `notes/07-map-loader.md` diff --git a/sim/src/chunk.rs b/sim/src/chunk.rs index 12d34c0..c727262 100755 --- a/sim/src/chunk.rs +++ b/sim/src/chunk.rs @@ -1,3 +1,4 @@ +/// Gameplay properties of a tile, derived from its id (see `map::tile_flags`). #[derive(Clone, Copy, Default, Debug, PartialEq, Eq)] pub struct TileFlags(pub u8); @@ -11,92 +12,42 @@ impl TileFlags { pub fn liquid(self) -> bool { self.0 & Self::LIQUID != 0 } } -#[derive(Clone, Copy, Default, Debug, PartialEq, Eq)] -pub struct TileDef { pub tile_id: u16, pub flags: TileFlags } - -#[derive(Debug)] -pub struct PaletteFullError; +pub const CHUNK_SIZE: usize = 32; +pub const CHUNK_TILES: usize = CHUNK_SIZE * CHUNK_SIZE; +/// A 32×32 block of tile ids, row-major. This is the whole chunk: flags are derived from +/// the id on lookup, so the in-memory layout is already the plain `u16` array a binary +/// on-disk format would store. pub struct Chunk { - pub palette: [TileDef; 64], - pub pal_count: u8, - pub tiles: Box<[u8; 1024]>, - pub version: u16, + pub tiles: Box<[u16; CHUNK_TILES]>, } impl Chunk { - /// Runtime use: all tiles empty, pal_count=1, version=1. - /// Clients with version=0 will always request this chunk. + /// All tiles id 0 (empty / solid border). pub fn new() -> Self { - Self { - palette: [TileDef::default(); 64], - pal_count: 1, - tiles: Box::new([0u8; 1024]), - version: 1, - } + Self { tiles: Box::new([0; CHUNK_TILES]) } } - /// Find existing palette entry or insert a new one. - /// Index 0 is always the null sentinel; this short-circuits for default TileDef. - /// Returns (palette_index, was_new). Does NOT bump version. - fn find_or_insert_raw(&mut self, def: TileDef) -> Result<(u8, bool), PaletteFullError> { - if def == TileDef::default() { - return Ok((0, false)); - } - for i in 1..self.pal_count as usize { - if self.palette[i] == def { - return Ok((i as u8, false)); + /// World gen path. Calls the closure for every local tile coordinate. + pub fn generate(f: impl Fn(u8, u8) -> u16) -> Self { + let mut chunk = Self::new(); + for ly in 0..CHUNK_SIZE { + for lx in 0..CHUNK_SIZE { + chunk.tiles[ly * CHUNK_SIZE + lx] = f(lx as u8, ly as u8); } } - if self.pal_count >= 64 { - return Err(PaletteFullError); - } - let idx = self.pal_count; - self.palette[idx as usize] = def; - self.pal_count += 1; - Ok((idx, true)) + chunk } - /// World gen path. Calls the closure for every tile coordinate. - /// version=0 so the first StatePacket causes all clients to request it. - pub fn generate(f: impl Fn(u8, u8) -> TileDef) -> Result { - let mut chunk = Self { - palette: [TileDef::default(); 64], - pal_count: 1, - tiles: Box::new([0u8; 1024]), - version: 0, - }; - for ly in 0u8..32 { - for lx in 0u8..32 { - let def = f(lx, ly); - let (idx, _) = chunk.find_or_insert_raw(def)?; - chunk.tiles[ly as usize * 32 + lx as usize] = idx; - } - } - chunk.version = 1; - Ok(chunk) + pub fn set_tile(&mut self, lx: u8, ly: u8, id: u16) { + self.tiles[ly as usize * CHUNK_SIZE + lx as usize] = id; } - /// Set a tile at local coords. Bumps version if tile index or palette changed. - pub fn set_tile(&mut self, lx: u8, ly: u8, def: TileDef) -> Result<(), PaletteFullError> { - let (idx, was_new) = self.find_or_insert_raw(def)?; - let slot = &mut self.tiles[ly as usize * 32 + lx as usize]; - let changed = *slot != idx; - *slot = idx; - if changed || was_new { - self.version = self.version.wrapping_add(1); - if self.version == 0 { - self.version = 1; - } - } - Ok(()) - } - - pub fn get_tile(&self, lx: u8, ly: u8) -> TileDef { - self.palette[self.tiles[ly as usize * 32 + lx as usize] as usize] + pub fn get_tile(&self, lx: u8, ly: u8) -> u16 { + self.tiles[ly as usize * CHUNK_SIZE + lx as usize] } pub fn tile_flags(&self, lx: u8, ly: u8) -> TileFlags { - self.get_tile(lx, ly).flags + crate::map::tile_flags(self.get_tile(lx, ly)) } } diff --git a/sim/src/lib.rs b/sim/src/lib.rs index 4fd7bf2..2eae2bc 100644 --- a/sim/src/lib.rs +++ b/sim/src/lib.rs @@ -9,7 +9,7 @@ mod sim; pub use sim::Sim; -use chunk::{Chunk, TileDef, TileFlags}; +use chunk::Chunk; use map::TileMap; use world::World; @@ -99,8 +99,8 @@ pub fn tile_collidable(tile_id: u16) -> bool { /// Build a world from a loaded tile map. The map's top-left tile sits at world (0, 0); the /// map is sliced into 32×32 chunks. Tiles inside a loaded chunk but outside the authored map -/// become an invisible solid border (id 0, collidable), so the walkable world edge sits flush -/// with the visible map rim instead of with the larger chunk boundary. +/// get id 0 (solid, see `tile_collidable`), so the walkable world edge sits flush with the +/// visible map rim instead of with the larger chunk boundary. pub fn load_world(map: &TileMap) -> World { let mut w = World::new(); let max_cx = (map.width.saturating_sub(1) >> 5) as i16; @@ -109,12 +109,8 @@ pub fn load_world(map: &TileMap) -> World { for cx in 0..=max_cx { let chunk = Chunk::generate(|lx, ly| { let (wx, wy) = world::local_to_tile(cx, cy, lx, ly); - if wx < 0 || wy < 0 || wx >= map.width as i16 || wy >= map.height as i16 { - return TileDef { tile_id: 0, flags: TileFlags(TileFlags::COLLIDABLE) }; - } - let id = map.tile(wx, wy); - TileDef { tile_id: id, flags: map::tile_flags(id) } - }).expect("palette overflow during world gen"); + map.tile(wx, wy) // 0 outside the map + }); w.set_chunk(cx, cy, chunk); } } diff --git a/sim/src/map.rs b/sim/src/map.rs index 274ddf4..d135728 100644 --- a/sim/src/map.rs +++ b/sim/src/map.rs @@ -64,9 +64,9 @@ impl TileMap { } } -/// Gameplay flags for a global tile id. Collision comes from the shared movement -/// vocabulary (`crate::tile_collidable`) so the client can predict it identically; -/// other flags (opaque, …) stay sim-side. Tile ids index into `overworld.tga`. +/// Gameplay flags for a global tile id. Collision comes from the movement vocabulary +/// (`crate::tile_collidable`) so the pathfinder predicts it identically; other flags +/// (opaque, …) will join here. Tile ids index into `overworld.png`. pub fn tile_flags(tile_id: u16) -> TileFlags { let mut bits = 0u8; if crate::tile_collidable(tile_id) { diff --git a/sim/src/sim.rs b/sim/src/sim.rs index dabb25d..9a0b939 100755 --- a/sim/src/sim.rs +++ b/sim/src/sim.rs @@ -69,16 +69,14 @@ impl Sim { #[cfg(test)] mod tests { use super::*; - use crate::chunk::{Chunk, TileDef, TileFlags}; + use crate::chunk::Chunk; use crate::player_action; + /// Open floor (id 1) with a single wall tile at (5, 4) — id 146 is collidable in + /// the tile vocabulary. fn open_world() -> World { let mut w = World::new(); - w.set_chunk(0, 0, Chunk::generate(|lx, ly| { - // A single wall tile at (5, 4). - let flags = if (lx, ly) == (5, 4) { TileFlags::COLLIDABLE } else { 0 }; - TileDef { tile_id: 1, flags: TileFlags(flags) } - }).unwrap()); + w.set_chunk(0, 0, Chunk::generate(|lx, ly| if (lx, ly) == (5, 4) { 146 } else { 1 })); w } diff --git a/sim/src/world.rs b/sim/src/world.rs index 3929514..25d7360 100755 --- a/sim/src/world.rs +++ b/sim/src/world.rs @@ -1,5 +1,5 @@ use std::collections::HashMap; -use crate::chunk::{Chunk, TileDef, TileFlags, PaletteFullError}; +use crate::chunk::{Chunk, TileFlags}; use crate::entity::Entity; pub fn tile_to_chunk(tx: i16, ty: i16) -> (i16, i16) { @@ -45,11 +45,11 @@ impl World { self.chunks.get(&(cx, cy)).map(|c| c.tile_flags(lx, ly)) } - pub fn set_tile(&mut self, wx: i16, wy: i16, def: TileDef) -> Result<(), PaletteFullError> { + pub fn set_tile(&mut self, wx: i16, wy: i16, id: u16) { let (cx, cy) = tile_to_chunk(wx, wy); let (lx, ly) = tile_to_local(wx, wy); let chunk = self.chunks.entry((cx, cy)).or_insert_with(Chunk::new); - chunk.set_tile(lx, ly, def) + chunk.set_tile(lx, ly, id); } pub fn spawn_entity(&mut self, type_id: u16, pos: (i16, i16), hp: u16) -> u32 {