prog8/compiler/examples/mandelbrot-novm.p8

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2018-10-23 23:39:52 +00:00
%import c64utils
%option enable_floats
~ main {
const uword width = 320 // 2
const uword height = 256 // 2
const uword xoffset = 40
const uword yoffset = 30
sub start() {
;vm_gfx_clearscr(11)
;vm_gfx_text(2, 1, 1, "Calculating Mandelbrot Fractal...")
for ubyte pixely in yoffset to yoffset+height-1 {
float yy = flt((pixely-yoffset))/height/3.6+0.4
for uword pixelx in xoffset to xoffset+width-1 {
float xx = flt((pixelx-xoffset))/width/3.0+0.2
float xsquared = 0.0
float ysquared = 0.0
float x = 0.0
float y = 0.0
ubyte iter = 0
while (iter<32 and xsquared+ysquared<4.0) {
y = x*y*2.0 + yy
x = xsquared - ysquared + xx
xsquared = x*x
ysquared = y*y
iter++
}
;vm_gfx_pixel(pixelx, pixely, iter)
}
}
;vm_gfx_text(11, 21, 1, "Finished!")
}
}