47 lines
2.7 KiB
Text
47 lines
2.7 KiB
Text
# backend.ludic - the renderer seam: what a renderer draws, and nothing more. Only rect, text and
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# measure are needed; the rest improve on a default (a rounded rect falls back to a square one, an
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# image to nothing). Input is the runtime's own (Input.*), so no renderer has to supply it.
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export property UiBackend {
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rect: fn(float, float, float, float, int, float) -> void = null # x y w h rgb alpha
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round: fn(float, float, float, float, float, int, float) -> void = null # ... radius rgb alpha
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ring: fn(float, float, float, float, float, float, int, float) -> void = null # x y w h radius width rgb alpha
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text: fn(float, float, string, float, int, float) -> void = null # x y text size rgb alpha
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measure: fn(string, float) -> float = null
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image: fn(string, float, float, float, float, int, float) -> void = null # src x y w h tint alpha
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image_w: fn(string) -> float = null # a picture's own size, for object-fit
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image_h: fn(string) -> float = null
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nine: fn(string, float, float, float, float, float, float, int, float) -> void = null # src slice x y w h width tint alpha (ui_nine_cuts)
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clip: fn(float, float, float, float) -> void = null
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unclip: fn() -> void = null
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scale: fn() -> float = null # screen pixels per design pixel
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translate: fn(string) -> string = null # the program's language, for every text a template shows
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sound: fn(string) -> void = null # a control was used: "click", or its sound="..."
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read: fn(string) -> string = null # a template file's text (else Fs.read_text)
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now: fn() -> float = null # seconds, for animation (else frames at 60 a second)
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input: bool = true # false: take no input from Input.* (a test drives it)
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}
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var ui_be: UiBackend = null
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export function ui_backend(b: UiBackend) -> void { ui_be = b }
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function ui_px(v: float) -> float {
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if ui_be != null and ui_be.scale != null { return v * ui_be.scale() }
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return v
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}
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function ui_tr(s: string) -> string {
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if ui_be != null and ui_be.translate != null { return ui_be.translate(s) }
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return s
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}
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function ui_sound(name: string) -> void {
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if ui_be != null and ui_be.sound != null { ui_be.sound(name) }
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}
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# the program's language: every text a template shows goes through `f` before it is measured
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export function ui_translator(f: fn(string) -> string) -> void {
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if ui_be != null { ui_be.translate = f }
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}
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# the program's sounds: "click" when a control is used, or the control's own sound="..."
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export function ui_sounds(f: fn(string) -> void) -> void {
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if ui_be != null { ui_be.sound = f }
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}
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# the program's clock, in seconds, for animation (a game's own time, which a headless run counts)
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export function ui_clock(f: fn() -> float) -> void {
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if ui_be != null { ui_be.now = f }
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}
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