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|
(define-module (bytepusher)
#:use-module (rnrs bytevectors)
#:use-module (srfi srfi-1)
#:use-module (ice-9 binary-ports)
#:use-module (sdl2)
#:use-module (sdl2 render)
#:use-module (sdl2 surface)
#:use-module (sdl2 events)
#:use-module (sdl2 video)
#:use-module (sdl2 rect)
#:use-module (sdl2 image))
(define width 256)
(define height 256)
(define keys (make-bitvector 16 #f))
(define memory (make-bytevector (* 1024 1024 16)))
;; key control ----
(define (set-key! index)
(bitvector-set-bit! keys index))
(define (clear-keys!)
(bitvector-clear-all-bits! keys))
(define (keys->half)
(let loop ((i 0)
(acc 0))
(if (= i (bitvector-length keys))
acc
(loop (+ 1 i)
(+ acc (if (bitvector-bit-set? keys i) (expt 2 i) 0))))))
;; ---- key control
;; memory ----
(define (get-pc)
(+ (bytevector-u16-ref memory 3 (endianness big))
(ash (bytevector-u8-ref memory 2) 16)))
(define (set-pc! value)
(let ((pc value))
(bytevector-u16-set! memory 2 (ash pc -8) (endianness big))
(bytevector-u8-set! memory 4 (ash pc -16))))
(define (get-addr pos)
(+ (bytevector-u16-ref memory (+ 1 pos) (endianness big))
(ash (bytevector-u8-ref memory pos) 16)))
(define (get-initial-pixel)
(ash (bytevector-u8-ref memory 5) 16))
(define (get-sample)
(bytevector-u16-ref memory 6 (endianness big)))
(define (get-byte n)
(bytevector-u8-ref memory n))
(define (set-byte! n v)
(bytevector-u8-set! memory n v))
;; ---- memory
;; colors ----
; Only used to set the colormap, use the faster version is below
(define (pixel->color pixel)
(if (> pixel 216)
0
(let* ((b (modulo pixel 6))
(g (modulo (/ (- pixel (modulo pixel 6)) 6) 6))
(r (modulo (/ (- pixel (modulo pixel 36)) 36) 6)))
(+ #xFF (ash (* #x33 (+ (ash r 16) (ash g 8) b)) 8)))))
(define colormap
(uint-list->bytevector
(map pixel->color (iota 256))
(endianness big)
4))
(define (pixel->color-fast pixel)
(bytevector-u32-ref colormap (* 4 pixel) (endianness big)))
;; ---- colors
;; debug ----
(define (get-pixels)
(let* ((initial (get-initial-pixel))
(len (* width height))
(base (make-bytevector len)))
(bytevector-copy! memory initial base 0 len)
(uint-list->bytevector
(map pixel->color-fast (bytevector->u8-list base))
(endianness big)
4)))
(define (peek-memory start end)
(for-each (lambda (i) (display "0x")
(display (number->string i 16))
(newline))
(take (drop (bytevector->u8-list memory) start) (- end start))))
(define (display-state)
(sdl-init)
(call-with-window
(make-window #:title "BytePusher"
#:size (list (* 4 width) (* 4 height)))
(lambda (w)
(call-with-renderer
(make-renderer w)
(lambda (renderer)
(set-renderer-scale! renderer 4 4)
(clear-renderer renderer)
(render-copy renderer
(surface->texture
renderer
(bytevector->surface (get-pixels)
width
height
32
(* width 4))))
(present-renderer renderer)
(sleep 10)))))
(sdl-quit))
;; ---- debug
;; main operation ----
(define (load-program! path)
(call-with-input-file path
(lambda (p)
(let ((program (get-bytevector-all p)))
(bytevector-copy! program 0 memory 0 (bytevector-length program))))))
(define (execute! instruction-addr)
(let ((a (get-addr (+ 0 instruction-addr)))
(b (get-addr (+ 3 instruction-addr)))
(c (get-addr (+ 6 instruction-addr))))
(set-byte! b (get-byte a))
(set-pc! c)))
(define (loop-frame!)
(let loop ((count 65536))
(execute! (get-pc))
(unless (= count 0) (loop (- count 1)))))
(define (loop! renderer)
(set-renderer-scale! renderer 4 4)
(let loop ()
(let ((t0 (sdl-ticks)))
(loop-frame!)
(clear-renderer renderer)
;; TODO: Too many copies, improve upstream in Guile-SDL2
(render-copy renderer
(surface->texture
renderer
(bytevector->surface (get-pixels)
width
height
32
(* width 4))))
(present-renderer renderer)
(let ((t1 (sdl-ticks)))
(unless (> t1 (+ t0 1000/60))
(usleep (floor (* 1000 (- (+ t0 1000/60) t1))))))
(display (string-append
"FPS: "
(number->string
(exact->inexact (/ 1000 (- (sdl-ticks) t0)))) "\n")))
(loop)))
(define (main)
(load-program! "tests/palette.bp")
(sdl-init)
(call-with-window (make-window #:title "BytePusher"
#:size (list (* 4 width) (* 4 height)))
(lambda (w)
(call-with-renderer (make-renderer w) loop!)))
(sdl-quit))
;; ---- main operation
|
