带有SDL2和Lisp的多个图形窗口？

Question

我试图使用cl-sdl2和Clozure Common Lisp（在MS-Windows上，尽管我认为它应该在其他平台和编译器上按原样工作）绘制到两个单独的图形窗口。当我尝试下面的代码：

(ql:quickload "sdl2") 
(require :sdl2) 

(defun make-two-SDL-2-windows() 
    (let* ((win1 (sdl2:create-window :title "Win 1" :w 400 :h 400)) 
     (ren1 (sdl2:create-renderer win1)) 
     (win2 (sdl2:create-window :title "Win 2" :w 300 :h 300)) 
     (ren2 (sdl2:create-renderer win2))) 
    (sdl2:with-event-loop (:method :poll) 
     (:keyup 
     (:keysym keysym) 
     (when (sdl2:scancode= (sdl2:scancode-value keysym) :scancode-escape) 
      (sdl2:push-event :quit))) 
     (:idle() 
     (progn 
      (sdl2:render-present ren1) 
      (sdl2:render-present ren2))) 
     (:quit() 
     (progn 
      (sdl2:destroy-renderer ren1) 
      (sdl2:destroy-renderer ren2) 
      (sdl2:destroy-window win1) 
      (sdl2:destroy-window win2) 
      t))))) 

(defun main() 
    (sdl2:init :everything) 
    ;;;Clozure... 
    (process-run-function "window" #'make-two-SDL-2-windows)) 

(main) 

...既创造了“挂起”的新窗口，并且不响应/重绘按键或鼠标移动。我试图根据我在SDL2 examples中找到的内容来做这个片段。我必须误解如何在事件循环中使用cl-sdl2包装或类似的东西。有没有人在Common Lisp中使用多个窗口和SDL2？

---

这里有一个工作版本，得益于睿帮助：

(defun make-two-SDL-2-windows() 
    (sdl2:with-init (:everything) 
    (sdl2:with-window (win1 :title "Win1" :flags '(:shown)) 
     (sdl2:with-window (win2 :title "Win2" :flags '(:shown)) 
     (sdl2:with-renderer (ren1 win1 :flags '(:renderer-accelerated)) 
      (sdl2:with-renderer (ren2 win2 :flags '(:renderer-accelerated)) 
      (sdl2:with-event-loop (:method :poll) 
       (:keyup 
       (:keysym keysym) 
        (when (sdl2:scancode= (sdl2:scancode-value keysym) :scancode-escape) 
         (sdl2:push-event :quit))) 
       (:idle 
        () 
        (progn 
        (sdl2:set-render-draw-color ren1 0 0 255 255) 
        (sdl2:set-render-draw-color ren2 0 255 0 255) 
        (sdl2:render-draw-line ren1 150 20 100 300) 
        (sdl2:render-draw-line ren2 20 20 150 150) 
        (sdl2:render-present ren1) 
        (sdl2:render-present ren2))) 
       (:quit() t)))))))) 

Answer 1

你定义了两个窗口和渲染，而不在事件循环实际使用的时候;使用sdl2：with-renderer和sdl2：with-window来绑定它们。