Joseph Ferano
0a8dc1d82b
The colours were the report: edited, re-evaluated, unchanged, because defvar had said init-once and meant it. They are a def now, and so is gravity, which is a number to turn while the sand falls, and game-data, which is a file to edit and see re-read. The grid, the velocity field and the arena stay defonce: they are what the running game is, and a re-run that emptied them would be a restart wearing a re-run's name. current-color is the same argument about a smaller thing -- a brush you picked is a brush you keep.
133 lines
4.0 KiB
Plaintext
133 lines
4.0 KiB
Plaintext
(import rl "vendor:raylib")
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(import agent "vendor:agent")
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(import edn "vendor:edn")
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(defconst screen-width 900)
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(defconst screen-height 600)
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(defconst cell-size 5)
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(defconst rows (/ screen-height cell-size))
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(defconst cols (/ screen-width cell-size))
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(defconst brush-size 10)
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(defn dyn->f64 [v f64] f64 v)
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(defn dyn->u32 [v i64] u32 (u32 v))
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(def gravity dyn 0.05)
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(def colors dyn
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(let [v (vec-new dyn)]
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(push v 0xFFF00FFF)
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(push v 0x3B6E8CFF)
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(push v 0xA83232FF)
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(push v 0xCC6B1FFF)
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v))
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(defonce grid [rows [cols u32]])
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(defonce velocity [rows [cols f32]])
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(defonce current-color dyn 0)
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(defn clear-grid [] ()
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(set grid (zeroed))
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(set velocity (zeroed)))
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(defn next-color [] ()
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(set current-color (% (+ current-color 1) (len colors))))
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(defn paint-at [row i32 col i32] ()
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(let [half (/ brush-size 2)]
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(dotimes [x brush-size]
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(dotimes [y brush-size]
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(let [r (+ y (- row half))
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c (+ x (- col half))]
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(when (and (>= r 0) (< r (- rows 1))
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(>= c 0) (< c (- cols 1))
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(= 0 (at grid r c))
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(< (rand-f32) 0.5))
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(set (at grid r c) (dyn->u32 (at colors current-color)))
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(set (at velocity r c) 1.0)))))))
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(defn settle [row i32 col i32] ()
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(let [vel (+ (f32 (dyn->f64 gravity)) (at velocity row col))
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y (min (- rows 1) (+ row (i32 vel)))]
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(while (> y row)
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(when (= 0 (at grid y col))
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(set (at grid y col) (at grid row col))
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(set (at grid row col) 0)
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(set (at velocity y col) vel)
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(set (at velocity row col) 0.0)
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(return))
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(let [left? (and (> col 0) (= 0 (at grid y (- col 1))))
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right? (and (< col (- cols 1)) (= 0 (at grid y (+ col 1))))]
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(when (or left? right?)
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(let [side (cond
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(not left?) 1
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(not right?) -1
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:else (if (< (rand-f32) 0.5) 1 -1))]
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(set (at grid y (+ col side)) (at grid row col))
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(set (at grid row col) 0)
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(set (at velocity y (+ col side)) vel)
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(set (at velocity row col) 0.0)
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(return))))
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(set y (- y 1)))
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(set (at velocity row col) 0.0)))
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(defn step [] ()
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(let [row (- rows 2)]
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(while (>= row 0)
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(dotimes [col cols]
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(unless (= 0 (at grid row col))
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(settle row col)))
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(set row (- row 1)))))
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(defconst fnv-offset u64 0xcbf29ce484222325)
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(defconst fnv-prime u64 1099511628211)
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(defn hash-grid [] u64
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(let [h fnv-offset]
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(dotimes [row rows]
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(dotimes [col cols]
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(let [c (at grid row col)]
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(dotimes [b 4]
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(set h (bit-xor h (u64 (bit-and (>> c (u32 (* b 8))) 255))))
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(set h (* h fnv-prime))))))
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h))
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(defn game-update [] ()
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(when (rl/key-pressed? :key-r) (clear-grid))
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(when (rl/mouse-button-down? :mouse-left)
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(let [m (rl/get-mouse-position)]
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(paint-at (/ (i32 (.y m)) cell-size)
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(/ (i32 (.x m)) cell-size))))
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(when (rl/mouse-button-released? :mouse-left) (next-color))
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(step))
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(defn game-draw [] ()
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(rl/clear-background rl/black)
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(dotimes [row rows]
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(dotimes [col cols]
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(let [c (at grid row col)]
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(unless (= 0 c)
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(rl/draw-rectangle (i32 (* col cell-size))
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(i32 (* row cell-size))
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cell-size cell-size
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(rl/get-color c))))))
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(rl/draw-fps 20 20))
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(defonce frame Allocator (arena-new 262144))
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(def game-data dyn
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(handler-case (edn/read-file "game-data.edn")
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[(FileError [c] nil)]))
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(defn main [] ()
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(rl/set-trace-log-level :warning)
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(rl/init-window screen-width screen-height "SAND")
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(defer (rl/close-window))
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(rl/set-target-fps 120)
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(agent/start "/tmp/flan-sand.sock")
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(until (rl/window-should-close?)
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(restart-case
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(do (agent/poll)
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(game-update))
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(continue [] (do)))
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(rl/with-drawing
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(game-draw))))
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