Joseph Ferano
25f56c24a8
vendor/raylib/modes.flan: five macros over the five pairs the package binds -- with-drawing, with-mode-2d, with-mode-3d, with-texture-mode, with-scissor-mode. A second file with no declare-c in it, split out on vector.flan's reasoning: raylib.flan is the package's statement about C and nothing here names C, so nothing here can be made wrong by raylib changing. Each expands to (do (begin-... args) body... (end-...)) -- the calls the author used to type, in the order they typed them. No let, no gensym: nothing binds a name, so there is nothing for a caller's name to collide with. What it removes is the End* that is missing, wrong, or no longer beside its Begin*. What it cannot remove is a body leaving through the unwind path: a return or an invoke-restart skips the rest of the do and the End* with it. defer is the obvious fix and is refused inside a loop body, which is where a pair always lives -- checked, not assumed. So sand.flan's discipline stays: keep the restart boundary outside the pair. 35 call sites converted across examples/ and sand.flan. The one left is core-scissor-test.flan, whose Begin and End sit in two separate `when`s with the drawing between them -- a conditional pair is a shape a bracketing macro cannot express. test/programs/rl-with.flan covers with-scissor-mode, which no example can, with a frame function unreachable from main so it needs no libraylib; rl-with-reject.flan is the arity half.
118 lines
5.0 KiB
Plaintext
118 lines
5.0 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. Two of the three are a fixed number of
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;;;; decimal places, which `f64->bytes` cannot do — it is "%g" — so they
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;;;; still go through examples/digits.flan. The integer one does too, only
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;;;; because its width is needed to put the next piece after it; the draw
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;;;; itself is now (string (i64->bytes n)) and one draw-text.
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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/with-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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