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shm.lisp
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(in-package :pure-x11)
;; shm code
(defconstant +ipc-creat+ #o1000)
(defconstant +ipc-private+ 0)
(sb-alien:define-alien-routine shmget
sb-alien:int
(key sb-alien:int)
(size sb-alien:long)
(shmflg sb-alien:int))
(sb-alien:define-alien-routine shmat
(* sb-alien:unsigned-char)
(shmid sb-alien:int)
(shmaddr (* sb-alien:unsigned-char))
(shmflg sb-alien:int))
(sb-alien:define-alien-routine shmdt
sb-alien:int
(shmaddr (* sb-alien:unsigned-char)))
(defparameter *shm-id* nil)
(defparameter *at* nil)
(defun init-shm ()
(setf *shm-id* (shmget +ipc-private+
(* 255 256 4)
(logior +ipc-creat+ #o777))
*at* (shmat *shm-id*
(sb-sys:int-sap 0)
0))
(shm-attach *shm-id*))
#+nil
(shmdt *at*)
(defparameter *lut*
(make-array 256
:element-type 'single-float))
(defun init-lut ()
(setf (aref *lut* 0) 0s0)
(loop for i from 1 below (length *lut*) do
(setf (aref *lut* i) (log i))))
(defun log-lut (v)
(declare ((unsigned-byte 8) v)
(values single-float &optional))
(aref *lut* v))
(defun clamp (v)
(cond ((< v 0s0) 0)
((< 255s0 v) 255)
(t (floor v))))
(defun clone-screen ()
(let ((w 256)
(h 255))
(shm-get-image 30 80 w h)
(sleep .02)
(let* ((a (make-array (list h w 4)
:element-type '(unsigned-byte 8)))
(a1 (sb-ext:array-storage-vector a)))
(sb-sys:with-pinned-objects (a a1)
(sb-impl::%byte-blt (sb-alien:alien-sap *at*) 0
a1 0 (* 255 256 4)))
(let* ((b (make-array (array-dimensions a)
:element-type 'single-float))
(b1 (sb-ext:array-storage-vector b))
(edge (make-array (array-dimensions a)
:element-type '(unsigned-byte 8)))
(spread (make-array (array-dimensions a)
:element-type '(unsigned-byte 8))))
(dotimes (i (length a1))
(setf (aref b1 i) (log-lut (aref a1 i))
#+nil(let ((v (aref a1 i)))
(if (/= 0 v)
(log v)
0s0))))
(dotimes (k 3)
(loop for j from 1 below (1- h) do
(loop for i from 1 below (1- w) do
(dotimes (k 3)
(let ((v 0)
(mi -.2)
(ma .07))
(declare ((unsigned-byte 8) v))
(when (< mi
(- (aref b j (1+ i) k)
(aref b j (1- i) k))
ma)
(setf v 1))
(when (< mi
(- (aref b (1+ j) i k)
(aref b (1- j) i k))
ma)
(setf v (logior v 2)))
(setf (aref edge j i k) v))))))
#+nil (dotimes (k 3)
(dotimes (j h)
(let ((current (floor (aref a j 0 k) 2)))
(dotimes (i w)
(when (= 1 (logand 1 (aref edge j i k)))
(setf current (floor (aref a j i k) 2)))
(setf (aref spread j i k) current)))))
(dotimes (k 3)
(dotimes (i w)
(let ((current (floor (aref a 0 i k) 2)))
(dotimes (j h)
(when (= 1 (logand 2 (aref edge j i k)))
(setf current (floor (aref a j i k) 2)))
(incf (aref spread j i k) current)))))
(put-image-big-req spread)))))
#+nil
(init-lut)
#+nil
(dotimes (i 100)
(clone-screen))
#+nil
(progn
(connect)
(parse-initial-response *resp*)
(make-window)
(init-shm))
;; X11/extensions/shmproto.h
(defun shm-attach (shmid)
(setf *shmseg* (1+ *gc*))
(with-packet
(card8 139) ; shm req code
(card8 1) ; shm req type
(card16 4) ; length
(card32 *shmseg*) ; shmseg e.g. #x2e0001
(card32 shmid) ; shmid, result of shmget
(card8 0) ; read only
(card8 0) ; pad0
(card16 0) ; pad1
)
(force-output *s*))
(defun shm-get-image (x y w h)
(with-packet
(card8 139) ; shm req code
(card8 4) ; shm req type
(card16 8) ; length
(card32 *root*) ; drawable
(card16 x)
(card16 y)
(card16 w)
(card16 h)
(card32 #x00ffffff) ; plane mask
(card8 2) ; format = z
(card8 0) ; pad0
(card8 0) ; pad1
(card8 0) ; pad2
(card32 *shmseg*) ; shmseg
(card32 0) ; offset
)
(force-output *s*))