gistfile1.nim

## Bare-bones SDL2 example
import sdl2, sdl2/gfx

discard sdl2.init(INIT_EVERYTHING)

var
  window: WindowPtr
  render: RendererPtr

window = createWindow("SDL Skeleton", 100, 100, 640,480, SDL_WINDOW_SHOWN)
render = createRenderer(window, -1, Renderer_Accelerated or Renderer_PresentVsync or Renderer_TargetTexture)

var
  pix: pointer
  surf = loadBMP("duck.bmp")
  formattedSurface = convertSurfaceFormat(surf, window.getPixelFormat, 0)
  tex = createTexture(render, window.getPixelFormat, 
    SDL_TEXTUREACCESS_STREAMING, formattedSurface.w, formattedSurface.h )
  rect = rect(0,0, formattedSurface.w, formattedSurface.h)
  pitch = formattedSurface.pitch
lockTexture(tex, rect.addr, pix.addr, pitch.addr)
#                memcpy( mPixels, formattedSurface->pixels, formattedSurface->pitch * formattedSurface->h );
copyMem(pix, formattedSurface.pixels, formattedSurface.pitch*formattedSurface.h)
unlockTexture(tex)

var
  evt = sdl2.defaultEvent
  runGame = true
  fpsman: FpsManager
fpsman.init

while runGame:
  while pollEvent(evt):
    if evt.kind == QuitEvent:
      runGame = false
      break

  let dt = fpsman.getFramerate() / 1000

  render.setDrawColor 0,0,0,255
  render.clear

  render.copy tex, rect.addr, rect.addr

  render.present
  fpsman.delay

destroy render
destroy window