Joseph Ferano
afec482722
The first ten of raylib's core list, ported. Seven new bindings and the named colour palette; nothing else was added, because a binding called by nothing is the same as not having bound it. The gaps they found are the point. No number reaches draw-text: i64->bytes answers [u8], draw-text wants a string, and nothing bridges — five of the ten wanted TextFormat and got a glyph table instead. And an enum parameter cannot be driven by a loop variable: the index is an i32, the parameter is an enum, neither converts, and a second declare-c with an i32 face is refused because one C function gets one binding. Two correct rules that compose into a wall. None of the gaps expected blocked anything: no generics, no allocator, no Vec, no escaping closure, no block-scoped defer. These are input-and-draw programs over fixed-size state, which is the shape the language has.
116 lines
4.7 KiB
Plaintext
116 lines
4.7 KiB
Plaintext
;;;; raylib [core] example - delta time
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;;;;
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;;;; examples/core/core_delta_time.c. Needed get-mouse-wheel-move and get-fps,
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;;;; both now bound — draw-fps was already there, but it puts the number on the
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;;;; screen itself and this example wants to compare it against the target it
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;;;; set, so it needs the number back.
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;;;;
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;;;; Three TextFormats in the C, all drawn here by examples/digits.flan.
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;;;;
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;;;; One faithfulness note that is a bug in the C and is kept anyway: it draws
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;;;; `TextFormat("Frame time: %02.02f ms", GetFrameTime())` — GetFrameTime is
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;;;; in SECONDS, so at 60 fps the C's own screen reads "0.02 ms" for what is
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;;;; really 16.7 ms. Porting it as-is means the two programs show the same
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;;;; thing, which is what a port is for; the milliseconds are drawn beside it
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;;;; here rather than instead of it, so the file is not quietly asserting that
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;;;; the original was right.
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;;;;
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;;;; The two circle positions are `defvar`s for the usual reason: they are
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;;;; state between frames and a `let` inside the loop would reset them.
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(import rl "vendor:raylib")
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(import d "digits.flan")
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(defconst screen-width 800)
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(defconst screen-height 450)
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(defconst speed f32 10.0)
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(defconst circle-radius f32 32.0)
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(defvar delta-circle rl/Vector2)
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(defvar frame-circle rl/Vector2)
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(defvar current-fps i32)
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(defn main []
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(rl/init-window screen-width screen-height
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"raylib [core] example - delta time")
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(defer (rl/close-window))
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(set current-fps 60)
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(set delta-circle (rl/Vector2 {:x 0.0 :y (/ (f32 screen-height) 3.0)}))
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(set frame-circle (rl/Vector2 {:x 0.0
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:y (* (f32 screen-height) (/ 2.0 3.0))}))
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(rl/set-target-fps current-fps)
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(until (rl/window-should-close?)
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;; Update
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(let [wheel (rl/get-mouse-wheel-move)]
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(unless (= wheel 0.0)
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(set current-fps (+ current-fps (i32 wheel)))
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(when (< current-fps 0) (set current-fps 0))
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(rl/set-target-fps current-fps)))
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;; The whole point of the example: one circle is scaled by the frame time
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;; and one is not, so lowering the target with the wheel makes the second
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;; one crawl while the first keeps its speed.
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(set (.x delta-circle)
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(+ (.x delta-circle) (* (rl/get-frame-time) (* 6.0 speed))))
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(set (.x frame-circle) (+ (.x frame-circle) (* 0.1 speed)))
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(when (> (.x delta-circle) (f32 screen-width)) (set (.x delta-circle) 0.0))
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(when (> (.x frame-circle) (f32 screen-width)) (set (.x frame-circle) 0.0))
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(when (rl/key-pressed? :r)
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(set (.x delta-circle) 0.0)
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(set (.x frame-circle) 0.0))
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;; Draw
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(rl/begin-drawing)
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(rl/clear-background rl/raywhite)
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(rl/draw-circle-v delta-circle circle-radius rl/red)
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(rl/draw-circle-v frame-circle circle-radius rl/blue)
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;; "FPS: unlimited (%i)" when the target is 0, "FPS: %i (target: %i)"
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;; otherwise — the C's own branch, reassembled out of literals and
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;; draw-int. `x` walks along the line as each piece is drawn, which is what
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;; the returned width from draw-int is for.
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(if (<= current-fps 0)
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(let [x 10]
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(rl/draw-text "FPS: unlimited (" x 10 20 rl/darkgray)
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(set x (+ x (rl/measure-text "FPS: unlimited (" 20)))
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(set x (+ x (d/draw-int (rl/get-fps) x 10 20 rl/darkgray)))
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(rl/draw-text ")" x 10 20 rl/darkgray))
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(let [x 10]
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(rl/draw-text "FPS: " x 10 20 rl/darkgray)
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(set x (+ x (rl/measure-text "FPS: " 20)))
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(set x (+ x (d/draw-int (rl/get-fps) x 10 20 rl/darkgray)))
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(rl/draw-text " (target: " x 10 20 rl/darkgray)
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(set x (+ x (rl/measure-text " (target: " 20)))
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(set x (+ x (d/draw-int current-fps x 10 20 rl/darkgray)))
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(rl/draw-text ")" x 10 20 rl/darkgray)))
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;; The C's line, kept exactly — seconds, labelled ms.
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(let [x 10]
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(rl/draw-text "Frame time: " x 30 20 rl/darkgray)
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(set x (+ x (rl/measure-text "Frame time: " 20)))
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(set x (+ x (d/draw-f32 (rl/get-frame-time) 2 x 30 20 rl/darkgray)))
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(rl/draw-text " ms" x 30 20 rl/darkgray))
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;; And the same number in the unit the label claims, so the file does not
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;; have to be read to notice.
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(let [x 10]
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(rl/draw-text "(really " x 50 20 rl/lightgray)
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(set x (+ x (rl/measure-text "(really " 20)))
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(set x (+ x (d/draw-f32 (* (rl/get-frame-time) 1000.0) 2 x 50 20
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rl/lightgray)))
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(rl/draw-text " ms)" x 50 20 rl/lightgray))
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(rl/draw-text "Use the scroll wheel to change the fps limit, r to reset"
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10 70 20 rl/darkgray)
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(rl/draw-text "FUNC: x += GetFrameTime()*speed" 10 110 20 rl/red)
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(rl/draw-text "FUNC: x += speed" 10 260 20 rl/blue)
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(rl/end-drawing)))
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