mirror of
https://github.com/irmen/prog8.git
synced 2024-11-04 04:05:00 +00:00
127 lines
3.2 KiB
Lua
127 lines
3.2 KiB
Lua
%import syslib
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%import textio
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%import math
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; converted from plasma test program for cc65.
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; which is (w)2001 by groepaz/hitmen
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;
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; Cleanup and porting to C by Ullrich von Bassewitz.
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; See https://github.com/cc65/cc65/tree/master/samples/cbm/plasma.c
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;
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; Optimized and Converted to prog8 by Irmen de Jong.
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main {
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const uword SCREEN1 = $E000
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const uword SCREEN2 = $E400
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const uword CHARSET = $E800
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const ubyte PAGE1 = ((SCREEN1 >> 6) & $F0) | ((CHARSET >> 10) & $0E)
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const ubyte PAGE2 = ((SCREEN2 >> 6) & $F0) | ((CHARSET >> 10) & $0E)
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sub start() {
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txt.color(1)
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txt.clear_screen()
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txt.print("creating charset...\n\nwhile running, press key to stop.\n\n")
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makechar()
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ubyte block = c64.CIA2PRA
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ubyte v = c64.VMCSB
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c64.CIA2PRA = (block & $FC) | (lsb(SCREEN1 >> 14) ^ $03)
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uword frames = 0
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cbm.SETTIM(0,0,0)
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while cbm.GETIN()==0 {
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doplasma(SCREEN1)
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c64.VMCSB = PAGE1
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doplasma(SCREEN2)
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c64.VMCSB = PAGE2
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frames += 2
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}
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uword jiffies = cbm.RDTIM16()
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; restore screen and displays stats
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c64.VMCSB = v
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c64.CIA2PRA = block
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txt.print("time in jiffies: ")
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txt.print_uw(jiffies)
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txt.print("\nframes: ")
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txt.print_uw(frames)
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uword fps = (frames*60)/jiffies
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txt.print("\nfps: ")
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txt.print_uw(fps)
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txt.print("\ndone!\n")
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repeat {
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}
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}
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; several variables outside of doplasma to make them retain their value
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ubyte c1A
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ubyte c1B
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ubyte c2A
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ubyte c2B
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sub doplasma(uword @zp screen) {
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ubyte[40] xbuf
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ubyte[25] ybuf
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ubyte c1a = c1A
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ubyte c1b = c1B
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ubyte c2a = c2A
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ubyte c2b = c2B
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ubyte @zp x
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ubyte @zp y
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for y in 0 to 24 {
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ybuf[y] = math.sin8u(c1a) + math.sin8u(c1b)
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c1a += 4
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c1b += 9
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}
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c1A += 3
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c1B -= 5
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for x in 0 to 39 {
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xbuf[x] = math.sin8u(c2a) + math.sin8u(c2b)
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c2a += 3
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c2b += 7
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}
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c2A += 2
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c2B -= 3
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for y in 0 to 24 {
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ubyte @zp @shared yvalue = ybuf[y]
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for x in 0 to 39 {
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; @(screen+x) = xbuf[x] + yvalue
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; max optimized asm is this: (achieving ~21 fps on the C64):
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%asm {{
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lda p8_yvalue
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ldy p8_x
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clc
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adc p8_xbuf,y
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sta (p8_screen),y
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}}
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}
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screen += 40
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}
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}
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sub makechar() {
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ubyte[8] bittab = [ $01, $02, $04, $08, $10, $20, $40, $80 ]
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ubyte c
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for c in 0 to 255 {
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ubyte @zp s = math.sin8u(c) ; chance
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ubyte i
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; for all the pixels in the 8x8 character grid, determine (with a rnd chance) if they should be on or off
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for i in 0 to 7 {
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ubyte b=0
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ubyte @zp ii
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for ii in 0 to 7 {
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if math.rnd() > s
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b |= bittab[ii]
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}
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@(CHARSET + i + c*$0008) = b
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}
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}
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}
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}
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