irrlichtandClaude Opus 5
c512bf49da
The camera target was the sim tile, which jumps 8 px per movement window, and the follow was a constant-speed chase that stopped abruptly. Now the target is the render-side lerp position and the camera closes the gap exponentially, so it accelerates and settles smoothly. Also spawns the first NPC and switches the game to World::blocked. Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>
158 lines
8.2 KiB
Markdown
Executable File
158 lines
8.2 KiB
Markdown
Executable File
# Roadmap
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Local single-player roguelike with a continuously simulated, tick-based world.
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Workspace layout: `sim/` (headless world simulation — tiles, entities, movement rules,
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tick loop; no platform dependencies, unit-testable) and `game/` (the executable — window,
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rendering, input, pathfinding, camera; owns a `Sim` and drives it). The platform layer —
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window, GPU, input, RGB565 framebuffer — lives in the external `pbio` crate (git dependency,
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branch `truecolor16`),
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not in this repo.
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History: this fork started from a client/server multiplayer architecture (authoritative UDP
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server, thin client with prediction). The scope was cut to single player in September 2026;
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the sim kept its authoritative shape, everything network-related was removed. The `sim`
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crate's `tick`/`set_action` interface is the seam a server could be wrapped around again.
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---
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## Achieved milestones
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- [x] PNG loader: `Image::from_png` (via the `png` crate, quantized to RGB565 on load, alpha
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mask), `to_tileset` → `Vec<Tile>` in `game/src/assets.rs`. Framebuffer is 16-bit
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truecolor (`pbio` branch `truecolor16`)
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- [x] Pixel helpers: `set_pixel`, `extract`, `blit`, `blit_tile` in `game/src/game/pixelhelper.rs`
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— signed `i32` offsets, clip against all four framebuffer edges, per-tile opacity mask
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- [x] Input system: `GameAction`, `InputMap`, `InputState` in `game/src/input.rs` (over `pbio::Key`)
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- [x] World model: `World` of 32×32 `Chunk`s (plain `[u16; 1024]` tile ids, flags derived
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on lookup — the network-era 64-entry palette is gone), entities indexed per chunk,
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`entities_in_viewport`. Map path is the first CLI argument; `assets/map_large` is a
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generated 256×256 stress map
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- [x] Map loader: Tiled-CSV parser in `sim/src/map.rs` (flip-flag masking, content-derived
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dimensions), `load_world` slices it into chunks, invisible solid border at the map rim.
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See `notes/07-map-loader.md`
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- [x] Tile rendering: chunk-based world rendering straight from `World` (`render_viewport`)
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- [x] Sprite-based entity rendering: entity `type_id` → tile in `entities.png`, blitted with transparency
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- [x] Hybrid tick loop: 24 Hz base tick, movement in `entity_tick` every 4th tick (6 Hz);
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the game loop drives the sim with a fixed-timestep accumulator. See `notes/06-hybrid-tick-loop.md`
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- [x] Intent model: one scheduled action per entity per movement window (`Sim::set_action`),
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replaced on re-set, consumed on execution. Headless tests in `sim/src/sim.rs`
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- [x] 8-directional movement in chessboard geometry: world physics use the Chebyshev
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metric — diagonal and cardinal steps are the same distance, a "circle" is a square
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of tiles, matching the square viewport. The single-step rule lives in
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`sim::step_allowed` (king move onto a free tile, diagonals additionally need both
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orthogonal neighbors free — no corner cutting) and is the one function used by the
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sim and the A*. Two held keys walk diagonally.
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- [x] Collision vocabulary seeded with test values (`sim::tile_collidable`): id 146
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(trees/rocks) and id 0 (empty / the invisible world border). A proper tile-data file
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format replaces this table later.
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- [x] Click-to-move: framebuffer click → world tile, A* over the world
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(`game/src/game/pathfind.rs`, 8-connected, Chebyshev heuristic), route fed into the
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sim one step per movement window. Keyboard input cancels the route; each step is
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re-validated at scheduling time and a blocked step replans toward the persistent
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goal. Click-and-hold steers continuously: while the button is held the route keeps
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replanning toward the tile under the cursor (only when that tile changes — cursor
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or camera movement), sweeping across blocked tiles keeps the current route.
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- [x] Smooth camera follow: the camera is a float pixel position (`cam` in `game.rs`)
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that eases toward the player's *interpolated* render position (exponential
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approach, τ = 120 ms), snapping only to whole pixels at render time (and outright
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on teleport-sized corrections). The viewport renders with sub-tile offsets
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(31×31 tile pass + right-strip clip).
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- [x] Entity blocking: `World::blocked` (solid tile ∨ out of world ∨ occupied) is the
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one predicate the sim's `entity_tick` and the pathfinder share. Intents execute
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in id order, so the player (id 1) wins a contested tile deterministically.
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- [x] First NPC: `EntityKind { Player, Npc }` on `Entity`; `Sim::think` runs before
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every movement window and schedules a random king move for each NPC one window
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in four (seeded xorshift in `Sim`). Sprite = tile 1 in `entities.png` (a hen from
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the Mini-Medieval pack). One is spawned at (6, 6) in `Game::start`.
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- [x] Entity interpolation: per-id lerp table (`EntityLerp` in `game.rs`) — previous/current
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tile plus a clock, rendered as a pixel lerp over one movement interval. Jumps of
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more than one tile (Chebyshev) snap. Purely cosmetic; game logic keeps using the
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sim's tile positions.
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---
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## Upcoming work
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### 06 — Hybrid tick loop *(partially done)*
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Design of record: **`notes/06-hybrid-tick-loop.md`**.
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- [x] 24 Hz base loop driven from the game loop
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- [x] Stride layout settled: `entity_tick` at `%4` (6 Hz, sets movement rate)
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- [ ] Action-point model (`energy` / `speed` per entity, act when `energy >= ACTION_COST`).
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Removed from `entity.rs` for now as premature — reintroduce when NPCs (08) actually need it.
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Then `entity_tick` can move to `%2` (12 Hz) and `speed` sets the effective movement rate.
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---
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### 07 — Tiled map loader *(done — see Achieved / `notes/07-map-loader.md`)*
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Remaining follow-ups when the need is concrete:
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- Collision vocabulary: seeded with test values (0, 146) in `sim::tile_collidable`.
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Decide on a proper file format for tile data (collision, opacity, …) instead of a
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hardcoded match.
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- Tile flipping: orientation is discarded on load; revisit with the sprite pass (09).
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- Multiple / object layers (spawns, triggers) — not yet parsed. The player currently
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spawns at (0, 0).
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---
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### 08 — Basic NPC entity + AI budget *(wanderer done — see Achieved)*
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The wandering NPC and entity blocking have landed; `Sim::think` is the hook where the
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budget model goes once there are enough NPCs to need it. The action-point model from
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06 is still pending and only matters once NPC speeds should differ.
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- [x] `EntityKind::Npc`, `Sim::think` scheduling intents through the same intent table
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- Bump-to-attack: a step onto an occupied tile becomes an attack instead of a refused move
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- Per sim-tick: distribute a fixed `think_budget` across entities ordered by player proximity
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- Complex entities consume more budget; simple ones less. Loop breaks at zero — natural load shedding.
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- No framework. No trait objects yet. A match on `EntityKind` is fine.
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```rust
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let mut budget: u32 = BASE_BUDGET;
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for entity in entities_by_player_proximity() {
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if budget == 0 { break; }
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budget = budget.saturating_sub(entity.think(&mut world));
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}
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```
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---
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### 09 — Client camera *(done — see Achieved)*
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Sprite rendering, camera follow and entity interpolation have all landed.
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---
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### Later — UI / HUD
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- Bitmap font renderer: 8×8 glyph sheet PNG, `draw_text(frame, font, x, y, color, text)` — see `notes/04`
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- UI primitives in `game/src/ui.rs`: `fill_rect`, `draw_rect`, `draw_hbar` — see `notes/05`
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- HUD layout (320×240): HP bar + player name bottom 16px, message log right panel
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- A real clip-rect on the blit primitives belongs here — once the viewport and HUD panels are
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two distinct regions, the abstraction earns its keep. Not before.
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---
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### Later — Distribution
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- Asset embedding: `include_bytes!` for single-binary distribution (assets are currently
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read relative to the working directory)
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- Save / load: the world is a plain `Sim` value — serialize it. Roguelike convention is a
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single save slot deleted on load
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---
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### Later — World depth
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Once the simulation architecture is stable and a real level exists:
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- Doors, interactive objects
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- Combat: melee range check, HP, death, permadeath
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- Inventory
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- Day/night and weather on the slow tick (`% 192`) — affect visibility, spawns
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- Procedural dungeon generation (BSP or cellular automata feeding into the same tile format)
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