mirror of
https://github.com/irmen/prog8.git
synced 2024-09-16 16:55:50 +00:00
133 lines
3.9 KiB
Lua
133 lines
3.9 KiB
Lua
%import c64utils
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%import c64flt
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~ main {
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const uword width = 40
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const uword height = 25
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const float height_f = height
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; vertices
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byte[8] xcoor = [ -40, -40, -40, -40, 40, 40, 40, 40 ]
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byte[8] ycoor = [ -40, -40, 40, 40, -40, -40, 40, 40 ]
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byte[8] zcoor = [ -40, 40, -40, 40, -40, 40, -40, 40 ]
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; storage for rotated coordinates
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word[len(xcoor)] rotatedx
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word[len(ycoor)] rotatedy
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word[len(zcoor)] rotatedz
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sub start() {
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uword anglex
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uword angley
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uword anglez
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while(true) {
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rotate_vertices(msb(anglex), msb(angley), msb(anglez))
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c64scr.clear_screenchars(32)
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c64scr.print("\uf1203d cube!")
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draw_edges()
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anglex+=1000
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angley+=433
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anglez+=907
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}
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}
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sub rotate_vertices(ubyte ax, ubyte ay, ubyte az) {
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; rotate around origin (0,0,0)
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; set up the 3d rotation matrix values
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word wcosa = cos8(ax) as word
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word wsina = sin8(ax) as word
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word wcosb = cos8(ay) as word
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word wsinb = sin8(ay) as word
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word wcosc = cos8(az) as word
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word wsinc = sin8(az) as word
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word wcosa_sinb = wcosa*wsinb
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lsr(wcosa_sinb)
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lsr(wcosa_sinb)
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lsr(wcosa_sinb)
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lsr(wcosa_sinb)
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lsr(wcosa_sinb)
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lsr(wcosa_sinb)
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lsr(wcosa_sinb) ; / 128
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word wsina_sinb = wsina*wsinb
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lsr(wsina_sinb)
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lsr(wsina_sinb)
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lsr(wsina_sinb)
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lsr(wsina_sinb)
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lsr(wsina_sinb)
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lsr(wsina_sinb)
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lsr(wsina_sinb) ; / 128
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word Axx = (wcosa*wcosb as float / 128.0) as word
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word Axy = ((wcosa_sinb*wsinc - wsina*wcosc) as float / 128.0) as word
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word Axz = ((wcosa_sinb*wcosc + wsina*wsinc) as float / 128.0) as word
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word Ayx = (wsina*wcosb as float / 128.0) as word
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word Ayy = ((wsina_sinb*wsinc + wcosa*wcosc) as float / 128.0) as word
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word Ayz = ((wsina_sinb*wcosc - wcosa*wsinc) as float / 128.0) as word
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word Azx = -wsinb
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word Azy = (wcosb*wsinc as float / 128.0) as word
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word Azz = (wcosb*wcosc as float / 128.0) as word
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for ubyte i in 0 to len(xcoor)-1 {
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word xc = xcoor[i] as word
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word yc = ycoor[i] as word
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word zc = zcoor[i] as word
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word zz = Axx*xc + Axy*yc + Axz*zc
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lsr(zz)
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lsr(zz)
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lsr(zz)
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lsr(zz)
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lsr(zz)
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lsr(zz)
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lsr(zz) ; /128
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rotatedx[i] = zz
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zz=Ayx*xc + Ayy*yc + Ayz*zc
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lsr(zz)
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lsr(zz)
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lsr(zz)
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lsr(zz)
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lsr(zz)
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lsr(zz)
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lsr(zz) ; /128
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rotatedy[i] = zz
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zz = Azx*xc + Azy*yc + Azz*zc
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lsr(zz)
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lsr(zz)
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lsr(zz)
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lsr(zz)
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lsr(zz)
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lsr(zz)
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lsr(zz) ; /128
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rotatedz[i] = zz
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}
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}
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sub draw_edges() {
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; plot the points of the 3d cube
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; first the points on the back, then the points on the front (painter algorithm)
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for ubyte i in 0 to len(xcoor)-1 {
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word rz = rotatedz[i]
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if rz >= 10 {
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float persp = (rz as float + 180.0)/height_f
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byte sx = rotatedx[i] as float / persp as byte + width//2
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byte sy = rotatedy[i] as float / persp as byte + height//2
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c64scr.setchrclr(sx as ubyte, sy as ubyte, 46, i+2)
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}
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}
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for ubyte i in 0 to len(xcoor)-1 {
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word rz = rotatedz[i]
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if rz < 10 {
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float persp = (rz as float + 180.0)/height_f
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byte sx = rotatedx[i] as float / persp as byte + width//2
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byte sy = rotatedy[i] as float / persp as byte + height//2
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c64scr.setchrclr(sx as ubyte, sy as ubyte, 81, i+2)
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}
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}
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}
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}
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