mirror of
https://github.com/irmen/prog8.git
synced 2024-11-04 04:05:00 +00:00
112 lines
2.9 KiB
Lua
112 lines
2.9 KiB
Lua
%import syslib
|
|
%import textio
|
|
%import math
|
|
%zeropage basicsafe
|
|
|
|
; converted from plasma test program for cc65.
|
|
; which is (w)2001 by groepaz/hitmen
|
|
;
|
|
; Cleanup and porting to C by Ullrich von Bassewitz.
|
|
; See https://github.com/cc65/cc65/tree/master/samples/cbm/plasma.c
|
|
;
|
|
; Optimized and Converted to prog8 by Irmen de Jong.
|
|
|
|
|
|
main {
|
|
const uword VERA_CHARSET = $f000 ; $1f000
|
|
const uword VERA_TXTSCREEN = $b000 ; %1b000
|
|
|
|
sub start() {
|
|
txt.color(6)
|
|
txt.clear_screen()
|
|
makechar()
|
|
|
|
uword frames = 0
|
|
cbm.SETTIM(0,0,0)
|
|
|
|
while cbm.GETIN()==0 {
|
|
doplasma()
|
|
frames ++
|
|
}
|
|
|
|
uword jiffies = cbm.RDTIM16()
|
|
|
|
; restore screen and displays stats
|
|
|
|
cx16.screen_set_charset(2, 0)
|
|
txt.color(7)
|
|
txt.clear_screen()
|
|
txt.print("time in jiffies: ")
|
|
txt.print_uw(jiffies)
|
|
txt.print("\nframes: ")
|
|
txt.print_uw(frames)
|
|
uword fps = (frames*60)/jiffies
|
|
txt.print("\nfps: ")
|
|
txt.print_uw(fps)
|
|
txt.nl()
|
|
}
|
|
|
|
; several variables outside of doplasma to make them retain their value
|
|
ubyte c1A
|
|
ubyte c1B
|
|
ubyte c2A
|
|
ubyte c2B
|
|
|
|
sub doplasma() {
|
|
ubyte[txt.DEFAULT_WIDTH] xbuf
|
|
ubyte[txt.DEFAULT_HEIGHT] ybuf
|
|
ubyte c1a = c1A
|
|
ubyte c1b = c1B
|
|
ubyte c2a = c2A
|
|
ubyte c2b = c2B
|
|
ubyte @zp x
|
|
ubyte @zp y
|
|
|
|
for y in 0 to txt.DEFAULT_HEIGHT-1 {
|
|
ybuf[y] = math.sin8u(c1a) + math.sin8u(c1b)
|
|
c1a += 4
|
|
c1b += 9
|
|
}
|
|
c1A += 3
|
|
c1B -= 5
|
|
for x in 0 to txt.DEFAULT_WIDTH-1 {
|
|
xbuf[x] = math.sin8u(c2a) + math.sin8u(c2b)
|
|
c2a += 3
|
|
c2b += 7
|
|
}
|
|
c2A += 2
|
|
c2B -= 3
|
|
|
|
; sys.waitvsync() ; if you put this in it will run at 30 fps synced which looks really nice and smooth
|
|
|
|
; use vera auto increment writes to avoid slow txt.setchr(x, y, xbuf[x] + ybuf[y])
|
|
for y in 0 to txt.DEFAULT_HEIGHT-1 {
|
|
cx16.vaddr_autoincr(1, VERA_TXTSCREEN + y*$0100, 0, 2)
|
|
ubyte @zp yvalue = ybuf[y]
|
|
for x in 0 to txt.DEFAULT_WIDTH-1 {
|
|
cx16.VERA_DATA0 = xbuf[x] + yvalue
|
|
}
|
|
}
|
|
}
|
|
|
|
sub makechar() {
|
|
ubyte[8] bittab = [ $01, $02, $04, $08, $10, $20, $40, $80 ]
|
|
ubyte c
|
|
cx16.vaddr_autoincr(1, VERA_CHARSET, 0, 1)
|
|
for c in 0 to 255 {
|
|
ubyte @zp s = math.sin8u(c) ; chance
|
|
ubyte i
|
|
; for all the pixels in the 8x8 character grid, determine (with a rnd chance) if they should be on or off
|
|
for i in 0 to 7 {
|
|
ubyte b=0
|
|
ubyte @zp ii
|
|
for ii in 0 to 7 {
|
|
if math.rnd() > s
|
|
b |= bittab[ii]
|
|
}
|
|
cx16.VERA_DATA0 = b
|
|
}
|
|
}
|
|
}
|
|
}
|