60 lines
2.5 KiB
Scheme
60 lines
2.5 KiB
Scheme
(define-module (game level)
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#:use-module (game actors)
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#:use-module (goblins core)
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#:use-module (hoot bytevectors)
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#:use-module (ice-9 match)
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#:use-module (srfi srfi-9)
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#:export (make-level
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level?
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level-background
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level-actor
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level-player))
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;; Client-side rendering info coupled with level actor that contains
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;; game state.
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(define-record-type <level>
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(%make-level background actor player)
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level?
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(background level-background)
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(actor level-actor)
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(player level-player))
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(define (make-level width height background objects spawn-gem?)
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(let ((level* (spawn ^level width height))
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(len (bytevector-length objects)))
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;; Parsed packed object data and spawn objects, making special
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;; note of the player.
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(let lp ((i 0) (player #f))
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(if (< i len)
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(let* ((x (bytevector-u8-ref objects i))
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(y (bytevector-u8-ref objects (+ i 1)))
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(id (bytevector-u8-ref objects (+ i 2)))
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(obj (match id
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(1 (spawn ^wall x y 'brick))
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(2 (spawn ^wall x y 'copper))
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(3 (spawn ^player x y))
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(4 (spawn ^exit x y))
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(5 (spawn ^block x y 'copper))
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(6 (spawn ^block x y 'crate))
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(7 (spawn ^clock-emitter x y 4))
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(8 (let ((target-x (bytevector-u8-ref objects (+ i 3)))
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(target-y (bytevector-u8-ref objects (+ i 4))))
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(spawn ^floor-switch x y target-x target-y)))
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(9 (and spawn-gem? (spawn ^gem x y)))
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(10 (spawn ^gate x y))
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(11 (spawn ^and-gate x y))
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(12 (let ((target-x (bytevector-u8-ref objects (+ i 3)))
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(target-y (bytevector-u8-ref objects (+ i 4))))
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(spawn ^electric-switch x y target-x target-y)))
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(13 (spawn ^xor-gate x y))
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(id (error "invalid level object" id))))
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(i* (+ i (match id
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;; floor-switch or electric-switch
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((or 8 12) 5)
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(_ 3)))))
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(when obj
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($ level* 'add-object obj))
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(if (= id 3) ; player-spawn
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(lp i* obj)
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(lp i* player)))
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(%make-level background level* player)))))
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