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;;;; -*- Mode: Lisp -*-
;;;; Author: Matthew Danish <mrd@debian.org>
;;;; 2D graphics test
;;;;
;;;; Displays a BMP on the screen
;;;; You can click to move the BMP around, or use the A,S,D,W keys.
;;;; Q quits.
(defpackage #:2D-GRAPHICS-TEST
(:use #:common-lisp)
(:nicknames #:2dt)
(:export #:start))
(in-package #:2D-GRAPHICS-TEST)
(defvar *bot-x* 270)
(defvar *bot-y* 190)
(defvar *bot-vx* 0)
(defvar *bot-vy* 0)
(defparameter *image* (sdl-data:data-file "cl-sdl" "bmp"))
(defvar *image-surface*)
(defvar *joysticks*)
(defun init-sdl ()
(sdl:init (logior sdl:+init-video+))
(let ((surface (sdl:set-video-mode 640 480 16
(logior sdl:+resizable+
sdl:+swsurface+
sdl:+doublebuf+))))
(when (sgum:null-pointer-p surface)
(error "Unable to set video mode"))
(sdl:wm-set-caption "SDL Test" nil)
surface))
(defun open-joysticks ()
(sdl:init-subsystem (logior sdl:+init-joystick+))
(setq *joysticks* (make-array (sdl:num-joysticks)))
(dotimes (i (sdl:num-joysticks))
(let ((joystick (sdl:joystick-open i)))
(when (sgum:null-pointer-p joystick)
(warn "Unable to acquire joystick ~A" i))
(setf (aref *joysticks* i) joystick))))
(defun run-sdl-event-loop (surface update-fn)
(sdl:event-loop
(:key-down (scan-code key mod unicode)
(cond ((= key (char-code #\q))
(return))
((= key (char-code #\w))
(setf *bot-vy* -1))
((= key (char-code #\s))
(setf *bot-vy* 1))
((= key (char-code #\d))
(setf *bot-vx* 1))
((= key (char-code #\a))
(setf *bot-vx* -1))))
(:key-up (scan-code key mod unicode)
(cond ((= key (char-code #\q))
(return))
((= key (char-code #\w))
(setf *bot-vy* 0))
((= key (char-code #\s))
(setf *bot-vy* 0))
((= key (char-code #\d))
(setf *bot-vx* 0))
((= key (char-code #\a))
(setf *bot-vx* 0))))
(:mouse-button-up (button x y)
(format t "Mouse button up: ~A (~A, ~A)~%" button x y)
(setf *bot-x* x
*bot-y* y))
(:mouse-button-down (button x y)
(format t "Mouse button dn: ~A (~A, ~A)~%" button x y))
(:joy-axis-motion (joystick axis value)
(format t "~&Joystick ~A axis ~A at ~A.~%" joystick axis value))
(:joy-ball-motion (joystick ball xrel yrel)
(format t "~&Joystick ~A ball ~A moved (~A, ~A).~%" joystick ball xrel yrel))
(:joy-hat-motion (joystick hat state)
(format t "~&Joystick ~A hat ~A at ~A.~%" joystick hat state))
(:joy-button-up (joystick button)
(format t "~&Joystick ~A button ~A up.~%" joystick button))
(:joy-button-down (joystick button)
(format t "~&Joystick ~A button ~A down.~%" joystick button))
(:quit ()
(return))
(:resize (width height)
(format t "Resized width = ~A height = ~A~%" width height))
(:idle ()
(funcall update-fn))))
(defun add-within-bounds (value delta lower-bound upper-bound)
(max lower-bound (min upper-bound (+ value delta))))
(defun make-update-fn (surface)
(let* ((num-rectangles 0)
(start-time (get-universal-time))
(prev-time start-time))
#'(lambda ()
(cl-sdl:clear-screen surface :update-p nil)
(sgum:with-foreign-objects ((rect sdl:rect))
(setf (sdl:rect-x rect) *bot-x*
(sdl:rect-y rect) *bot-y*)
(sdl:blit-surface *image-surface* sgum:+null-pointer+
surface rect))
(sdl:flip surface)
(setf *bot-x* (add-within-bounds *bot-x* *bot-vx* 0 539)
*bot-y* (add-within-bounds *bot-y* *bot-vy* 0 380))
(incf num-rectangles)
(let ((cur-time (get-universal-time)))
(when (> (- cur-time prev-time) 1)
(format t "~&Rectangles per second: ~A~%"
(float (/ num-rectangles (- cur-time prev-time))))
(setf prev-time cur-time
num-rectangles 0))))))
(defun start ()
(setf *bot-x* 270
*bot-y* 190
*bot-vx* 0
*bot-vy* 0)
(let ((*image-surface* (cl-sdl:load-bmp *image*)))
(unwind-protect
(let ((surface (init-sdl)))
(open-joysticks)
(run-sdl-event-loop surface (make-update-fn surface)))
(progn
(sdl:free-surface *image-surface*)
(sdl:quit)))))
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