Ole André Vadla Ravnås
a1508524a0
A scene the image holds by handle and changes; the host draws it. Each drawable carries its own vertex and fragment stages, its own attribute layout, named uniforms, buffers, a transform and a visibility flag -- described as objects rather than staged globals. A value says what it should do, ramp or oscillate, rather than what it is each frame: nothing crosses per frame, since the image has no business in the frame path any more than in the audio callback. Both renderers work it out on the clock that draws it.
41 lines
1.4 KiB
Swift
41 lines
1.4 KiB
Swift
import Foundation
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/// What the pointer and keyboard are doing over a scene, as the frontends
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/// report it. Read rather than delivered: whoever drives the scene asks when
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/// it suits them, so neither renderer has to reach into the image.
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public struct CanvasInput: Sendable, Equatable {
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/// Where the pointer sits in clip space: -1 to 1, y upwards, so it lands
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/// in the same coordinates the vertices were given in.
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public var pointerX: Float = 0
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public var pointerY: Float = 0
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public var isPointerInside = false
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/// Bit 0 primary, bit 1 secondary, bit 2 middle.
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public var buttons: Int32 = 0
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public var keysDown: Set<Int32> = []
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public init() {}
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public func isDown(_ key: CanvasKey) -> Bool {
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keysDown.contains(key.rawValue)
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}
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}
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/// The keys a scene can be asked about, named so a frontend can map its own
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/// codes onto them once. Printable keys are their own lowercase character, so
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/// only the rest need naming.
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public enum CanvasKey: Int32, Sendable {
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case left = 1
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case right = 2
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case up = 3
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case down = 4
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case space = 32
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case enter = 13
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case escape = 27
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/// What a typed character answers to, so `isDown: $a` needs no table.
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public static func code(for character: Character) -> Int32 {
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guard let scalar = character.lowercased().unicodeScalars.first else { return 0 }
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return Int32(scalar.value)
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}
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}
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