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Task/Window-creation/Nim/window-creation-2.nim

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+import
+  sdl, sdl_image, colors
+
+var
+  screen, greeting: PSurface
+  r: TRect
+  event: TEvent
+  bgColor = colChocolate.int32
+
+if init(INIT_VIDEO) != 0:
+  quit "SDL failed to initialize!"
+
+screen = SetVideoMode(640, 480, 16, SWSURFACE or ANYFORMAT)
+if screen.isNil:
+  quit($sdl.getError())
+
+greeting = IMG_load("tux.png")
+if greeting.isNil:
+  echo "Failed to load tux.png"
+else:
+  ## convert the image to alpha and free the old one
+  var s = greeting.displayFormatAlpha()
+  swap(greeting, s)
+  s.freeSurface()
+
+r.x = 0
+r.y = 0
+
+block game_loop:
+  while true:
+
+    while pollEvent(addr event) > 0:
+      case event.kind
+      of QUITEV:
+        break game_loop
+      of KEYDOWN:
+        if EvKeyboard(addr event).keysym.sym == K_ESCAPE:
+          break game_loop
+      else:
+        discard
+
+    discard fillRect(screen, nil, bgColor)
+    discard blitSurface(greeting, nil, screen, addr r)
+    discard flip(screen)
+
+greeting.freeSurface()
+screen.freeSurface()
+sdl.Quit()