prog8/compiler/examples/mandelbrot.p8
Irmen de Jong c5d251073f removed broken unused symbol clean up for now
streamlined irq routine handling and compilation
2018-09-28 21:28:16 +02:00

70 lines
1.5 KiB
Lua

%option enable_floats
~ main {
sub start() -> () {
const word width = 320 // 2
const word height = 256 // 2
const word xoffset = 40
const word yoffset = 20
word pixelx
byte pixely
float xx
float yy
float x
float y
float xsquared
float ysquared
byte iter
word plotx
byte ploty
_vm_gfx_clearscr(11)
_vm_gfx_text(5, 5, 7, "Calculating Mandelbrot Fractal...")
for pixely in yoffset to yoffset+height-1 {
yy = flt((pixely-yoffset))/height/3.6+0.4
for pixelx in xoffset to xoffset+width-1 {
xx = flt((pixelx-xoffset))/width/3+0.2
x = 0.0
y = 0.0
xsquared = 0
ysquared = 0
iter = 0
while (iter<32 and xsquared+ysquared<4) {
y = x*y*2 + yy
x = xsquared - ysquared + xx
xsquared = x*x
ysquared = y*y
iter++
}
_vm_gfx_pixel(pixelx, pixely, iter)
}
}
_vm_gfx_text(110, 160, 7, "Finished!")
}
}
; ---- 60hz irq handling routine------
~ irq {
memory byte jiffyclockHi = $a0
memory byte jiffyclockMid = $a1
memory byte jiffyclockLo = $a2
sub irq() -> () {
_vm_gfx_pixel(jiffyclockLo,190,jiffyclockHi)
_vm_gfx_pixel(jiffyclockLo,191,jiffyclockMid)
_vm_gfx_pixel(jiffyclockLo,192,jiffyclockLo)
return
}
}