Refactor tutorial 08

08-geometry-rendering.lisp

@@ -0,0 +1,60 @@
+(defpackage #:sdl2-tutorial-08-geometry-rendering
+  (:use :cl)
+  (:export :run))
+
+(in-package :sdl2-tutorial-08-geometry-rendering)
+
+(defparameter *screen-width* 640)
+(defparameter *screen-height* 480)
+
+(defmacro with-window-renderer ((window renderer) &body body)
+  `(sdl2:with-init (:video)
+     (sdl2:with-window (,window
+                        :title "SDL2 Tutorial 08"
+                        :w *screen-width*
+                        :h *screen-height*
+                        :flags '(:shown))
+       (sdl2:with-renderer (,renderer ,window :index -1 :flags '(:accelerated))
+         ,@body))))
+
+(defun run ()
+  (with-window-renderer (window renderer)
+    (sdl2-image:init '(:png))
+    (sdl2:with-event-loop (:method :poll)
+      (:quit () t)
+      (:idle ()
+             ;; Clear screen
+             (sdl2:set-render-draw-color renderer #xFF #xFF #xFF #xFF)
+             (sdl2:render-clear renderer)
+
+             ;; Render red filled quad
+             (sdl2:with-rects ((fill-rect (/ *screen-width* 4)
+                                          (/ *screen-height* 4)
+                                          (/ *screen-width* 2)
+                                          (/ *screen-height* 2)))
+               (sdl2:set-render-draw-color renderer #xFF #x00 #x00 #xFF)
+               (sdl2:render-fill-rect renderer fill-rect))
+
+             ;; Render green outlined quad
+             (sdl2:with-rects ((outline-rect (round (/ *screen-width* 6))
+                                             (round (/ *screen-height* 8))
+                                             (round (* 2/3 *screen-width*))
+                                             (round (* 2/3 *screen-height*))))
+               (sdl2:set-render-draw-color renderer #x00 #xFF #x00 #xFF)
+               (sdl2:render-draw-rect renderer outline-rect))
+
+             ;; Draw blue horizontal line
+             (sdl2:set-render-draw-color renderer #x00 #x00 #xFF #xFF)
+             (sdl2:render-draw-line renderer
+                                    0
+                                    (/ *screen-height* 2)
+                                    *screen-width*
+                                    (/ *screen-height* 2))
+
+             ;; Draw vertical line of yellow dots
+             (sdl2:set-render-draw-color renderer #xFF #xFF #x00 #xFF)
+             (loop for i from 0 below *screen-height* by 4
+                   do (sdl2::render-draw-point renderer (/ *screen-width* 2) i))
+
+             ;; Update screen
+             (sdl2:render-present renderer)))))

sdl2-tutorial.asd

@@ -10,7 +10,7 @@
                (:file "05-optimized-surface-loading-and-soft-stretching")
                (:file "06-extension-libraries-and-loading-other-image-formats.lisp")
                (:file "07-texture-loading-and-rendering.lisp")
-               (:file "08/tutorial-08")
+               (:file "08-geometry-rendering")
                (:file "09/tutorial-09")
                (:file "10/tutorial-10")
                (:file "11/tutorial-11")