60 lines
1.8 KiB
Markdown
60 lines
1.8 KiB
Markdown
# lofivor - build roadmap
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survivor-like optimized for weak hardware. finding the performance ceiling first, then building the game.
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## phase 1: sandbox stress test
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- [x] create sandbox.zig (separate from existing game code)
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- [x] entity struct (x, y, vx, vy, color)
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- [x] flat array storage for entities
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- [x] spawn entities at random screen edges
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- [x] update loop: move toward center, respawn on arrival
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- [x] render: filled circles (4px radius, cyan)
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- [x] metrics overlay (entity count, frame time, update time, render time)
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- [x] controls: +/- 100, shift +/- 1000, space pause, r reset
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## phase 2: find the ceiling
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- [x] test on i5-6500T / HD 530 @ 1280x1024
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- [x] record entity count where 60fps breaks
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- [x] identify bottleneck (CPU update vs GPU render)
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- [x] document findings
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findings (AMD Radeon test):
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- 60fps breaks at ~5000 entities
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- render-bound: update stays <1ms even at 30k entities, render time dominates
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- individual drawCircle calls are the bottleneck
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## phase 3: optimization experiments
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based on phase 2 results:
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- [x] batch rendering via texture blitting (10x improvement)
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- [x] ~~if cpu-bound: SIMD, struct-of-arrays, multithreading~~ (not needed)
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- [x] re-test after each change
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findings:
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- texture blitting: pre-render circle to texture, drawTexture() per entity
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- baseline: 60fps @ ~5k entities
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- optimized: 60fps @ ~50k entities, 30fps @ 100k entities
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- see journal.txt for detailed benchmarks
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## phase 4: add collision
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- [ ] spatial partitioning (grid or quadtree)
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- [ ] projectile-to-enemy collision
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- [ ] measure new ceiling with collision enabled
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## phase 5: game loop
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- [ ] player entity (keyboard controlled)
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- [ ] enemy spawning waves
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- [ ] player attacks / projectiles
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- [ ] enemy death on hit
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- [ ] basic game feel
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## future
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- [ ] different enemy types
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- [ ] player upgrades
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- [ ] actual game design (after we know the constraints)
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