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impl frame timing

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This commit is contained in:
Andrew Glaze 2024-08-22 21:19:11 -04:00
parent 59e7559d77
commit df8be993f7
1 changed files with 15 additions and 1 deletions
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14
Sources/main.swift
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@ -41,8 +41,21 @@ let keyMap = [
]
var frame = Frame()
let time: UnsafeMutablePointer<timespec> = UnsafeMutablePointer<timespec>.allocate(capacity: 1)
clock_gettime(CLOCK_REALTIME, time)
time.pointee.tv_nsec += Int(0.01666 * 1000000000)
let bus = Bus(rom: rom, joypad1: joypad1) { ppu in
Render.render(ppu, frame: frame)
//wait here until 16.66 ms have passed
clock_nanosleep(CLOCK_REALTIME, TIMER_ABSTIME, time, nil)
var nextNSec = time.pointee.tv_nsec + Int(0.01666 * 1000000000)
if nextNSec > 999999999 {
nextNSec -= 999999999
time.pointee.tv_sec += 1
}
time.pointee.tv_nsec = nextNSec
SDL_UpdateTexture(texture, nil, frame.data, 256 * 3)
SDL_RenderCopy(canvas, texture, nil, nil)
SDL_RenderPresent(canvas)
@ -75,3 +88,4 @@ let bus = Bus(rom: rom, joypad1: joypad1) { ppu in
let cpu = CPU(bus: bus)
cpu.reset()
cpu.run()
time.deallocate()