127 lines
3.2 KiB
Nim
127 lines
3.2 KiB
Nim
import def, cpu
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import sdl2
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const TIMER_TICK = 1 / 60
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type SDLException = object of Defect
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template sdlFailIf(condition: typed, reason: string) =
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if condition: raise SDLException.newException(
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reason & ", SDL error " & $getError()
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)
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proc setKey(c: var CPU, key: Scancode, pressed: bool) =
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let keysym: uint8 =
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case key:
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of SDL_SCANCODE_0, SDL_SCANCODE_KP_0: 0
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of SDL_SCANCODE_1, SDL_SCANCODE_KP_1: 1
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of SDL_SCANCODE_2, SDL_SCANCODE_KP_2: 2
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of SDL_SCANCODE_3, SDL_SCANCODE_KP_3: 3
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of SDL_SCANCODE_4, SDL_SCANCODE_KP_4: 4
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of SDL_SCANCODE_5, SDL_SCANCODE_KP_5: 5
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of SDL_SCANCODE_6, SDL_SCANCODE_KP_6: 6
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of SDL_SCANCODE_7, SDL_SCANCODE_KP_7: 7
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of SDL_SCANCODE_8, SDL_SCANCODE_KP_8: 8
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of SDL_SCANCODE_9, SDL_SCANCODE_KP_9: 9
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of SDL_SCANCODE_A: 0xA
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of SDL_SCANCODE_B: 0xB
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of SDL_SCANCODE_C: 0xC
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of SDL_SCANCODE_D: 0xD
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of SDL_SCANCODE_E: 0xE
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of SDL_SCANCODE_F: 0xF
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else: return
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c.keys[keysym] = pressed
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if pressed and c.reading_key != NOT_READING:
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c.reg[c.reading_key] = keysym
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c.reading_key = NOT_READING
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proc draw(c: var CPU, renderer: RendererPtr, texture: TexturePtr) =
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texture.updateTexture(
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rect = nil,
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pixels = addr c.fb,
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pitch = SCR_WIDTH * uint32.sizeof
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)
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renderer.copy(
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texture = texture,
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srcrect = nil,
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dstrect = nil
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)
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renderer.present
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c.needs_draw = false
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proc spawn*(c: var CPU) =
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sdlFailIf(not sdl2.init(INIT_VIDEO or INIT_TIMER or INIT_EVENTS)):
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"SDL2 initialization failed"
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defer: sdl2.quit()
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let window = createWindow(
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title = "nim-chip8",
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x = SDL_WINDOWPOS_CENTERED,
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y = SDL_WINDOWPOS_CENTERED,
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w = SCR_WIDTH * 10,
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h = SCR_HEIGHT * 10,
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flags = SDL_WINDOW_SHOWN
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)
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sdlFailIf window.isNil: "window could not be created"
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defer: window.destroy()
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let renderer = createRenderer(
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window = window,
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index = -1,
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flags = Renderer_Accelerated or Renderer_PresentVsync or Renderer_TargetTexture
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)
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sdlFailIf renderer.isNil: "renderer could not be created"
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defer: renderer.destroy
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let texture = createTexture(
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renderer = renderer,
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format = SDL_PIXELFORMAT_ARGB8888,
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access = SDL_TEXTUREACCESS_STATIC,
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w = SCR_WIDTH,
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h = SCR_HEIGHT
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)
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sdlFailIf texture.isNil: "texture could not be created"
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defer: texture.destroy
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var
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running = true
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counter = getPerformanceCounter()
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dt: float32
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tt: float32
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previousCounter: uint64
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while running:
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previousCounter = counter
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counter = getPerformanceCounter()
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dt = (counter - previousCounter).float / getPerformanceFrequency().float
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tt += dt
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if tt > TIMER_TICK:
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if c.dt != 0: c.dt.dec
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if c.st != 0: c.st.dec
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tt = 0
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var event = defaultEvent
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while event.pollEvent:
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case event.kind
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of QuitEvent:
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running = false
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break
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of KeyDown:
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c.setKey event.key.keysym.scancode, true
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of KeyUp:
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c.setKey event.key.keysym.scancode, false
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else: discard
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if c.needs_draw: c.draw renderer, texture
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if c.reading_key == NOT_READING: c.step
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