prog8/examples/c64/plasma.p8
2024-09-22 13:20:12 +02:00

131 lines
3.4 KiB
Lua

%import syslib
%import textio
%import math
; 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 SCREEN1 = $E000
const uword SCREEN2 = $E400
const uword CHARSET = $E800
const ubyte PAGE1 = ((SCREEN1 >> 6) & $F0) | ((CHARSET >> 10) & $0E)
const ubyte PAGE2 = ((SCREEN2 >> 6) & $F0) | ((CHARSET >> 10) & $0E)
sub start() {
txt.color(1)
txt.clear_screen()
txt.print("creating charset...\n\nwhile running, press key to stop.\n\n")
makechar()
ubyte block = c64.CIA2PRA
ubyte v = c64.VMCSB
c64.CIA2PRA = (block & $FC) | (lsb(SCREEN1 >> 14) ^ $03)
uword frames = 0
cbm.SETTIM(0,0,0)
do {
doplasma(SCREEN1)
c64.VMCSB = PAGE1
doplasma(SCREEN2)
c64.VMCSB = PAGE2
frames += 2
void, cx16.r0L = cbm.GETIN()
} until cx16.r0L!=0
uword jiffies = cbm.RDTIM16()
; restore screen and displays stats
c64.VMCSB = v
c64.CIA2PRA = block
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.print("\ndone!\n")
repeat {
}
}
; several variables outside of doplasma to make them retain their value
ubyte c1A
ubyte c1B
ubyte c2A
ubyte c2B
sub doplasma(uword @zp screen) {
ubyte[40] xbuf
ubyte[25] ybuf
ubyte c1a = c1A
ubyte c1b = c1B
ubyte c2a = c2A
ubyte c2b = c2B
ubyte @zp x
ubyte @zp y
for y in 0 to 24 {
ybuf[y] = math.sin8u(c1a) + math.sin8u(c1b)
c1a += 4
c1b += 9
}
c1A += 3
c1B -= 5
for x in 0 to 39 {
xbuf[x] = math.sin8u(c2a) + math.sin8u(c2b)
c2a += 3
c2b += 7
}
c2A += 2
c2B -= 3
for y in 0 to 24 {
ubyte @zp @shared yvalue = ybuf[y]
for x in 0 to 39 {
@(screen+x) = xbuf[x] + yvalue
; optimized asm for the line above is this:
; (achieving ~23 fps on the C64, about 1 or 2 fps more than with the pure prog8 code):
; %asm {{
; lda p8v_yvalue
; ldy p8v_x
; clc
; adc p8v_xbuf,y
; sta (p8v_screen),y
; }}
}
screen += 40
}
}
sub makechar() {
ubyte[8] bittab = [ $01, $02, $04, $08, $10, $20, $40, $80 ]
ubyte c
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]
}
@(CHARSET + i + c*$0008) = b
}
}
}
}