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`nx_nxa_garment.nx` source

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1// nx_nxa_garment.nx -- FITTED GARMENT GENERATOR (SOTA garment rung): builds a dress mesh
2// fitted to the character BY MEASUREMENT (per-row body cross-section radii sampled from
3// VERT + ease margin -- tooling, per-character, no hand constants beyond the ease profile),
4// from underbust to mid-thigh with hem flare. Appends GVRT (rest verts, mesh space), GTRI,
5// GPIN (top-ring verts pinned; viewer binds pins to the chest frame). The viewer sims it
6// with general edge-list XPBD -- the same machinery future GarmentCode ingests will use.
7// usage: nx_nxa_garment <in.nxa> <out.nxa>
8// rc: 0 ok, 2 usage, 5 bad nxa, 9 io
9// license_tier: ORIGINAL
10import "nx_syscalls.nx"
11import "nx_nxa.nx"
12import "nx_itrig.nx"
13const K_MAGIC_4611686018427387903: i64 = 4611686018427387903
14const K_MAGIC_4096: i64 = 4096
15const K_MAGIC_100000000: i64 = 100000000
16const K_MAGIC_65536: i64 = 65536
17
18const GU: i64 = 36        // columns around the body
19const GV: i64 = 18        // rows above-bust..hem (one-layer strapless dress)
20
21func gw9(s: *u8) -> i64 { var n: i64=0; while s[n]!=(0 as u8){n=n+1} sys_write(1,s,n); return 0 }
22func gn9(v: i64) -> i64 {
  let t: *u8 = sys_mmap(32) as *u8
  var m: i64 = v; var w: i64 = 0
  if m<0 { t[w]=45 as u8; w=w+1; m=0-m }
  if m==0 { t[0]=48 as u8; sys_write(1,t,1); return 0 }
  let d: *u8 = sys_mmap(32) as *u8
  var k: i64=0
  while m>0 { d[k]=(48+(m%10)) as u8; m=m/10; k=k+1 }
  var j: i64=0
  while j<k { t[w]=d[k-1-j]; w=w+1; j=j+1 }
  sys_write(1,t,w); return 0
33}
34func main(argc: i64, argv: *i64) -> i64 {
  if argc < 3 { gw9("usage: nx_nxa_garment <in.nxa> <out.nxa>\n" as *u8); return 2 }
  let lp: *i64 = sys_mmap(16) as *i64
  let b: *u8 = sys_map_file(argv[1] as *u8, lp)
  let flen: i64 = lp[0]
  let vwo: i64 = nxa_find(b, flen, nxa_tag4("VERT" as *u8))
  if vwo < 0 { gw9("bad nxa\n" as *u8); return 5 }
  let h: *i64 = b as *i64
  let nv: i64 = h[vwo]
  let vx: *i64 = ((b as i64) + vwo*8 + 8) as *i64
  // measure: z-up models; body extents
  var mn2: i64 = K_MAGIC_4611686018427387903
  var mx2: i64 = 0 - K_MAGIC_4611686018427387903
  var mnx: i64 = K_MAGIC_4611686018427387903
  var mxx: i64 = 0 - K_MAGIC_4611686018427387903
  var mny: i64 = K_MAGIC_4611686018427387903
  var mxy: i64 = 0 - K_MAGIC_4611686018427387903
  var i0: i64 = 0
  while i0 < nv {
      if vx[i0*3] < mnx { mnx = vx[i0*3] }
      if vx[i0*3] > mxx { mxx = vx[i0*3] }
      if vx[i0*3+1] < mny { mny = vx[i0*3+1] }
      if vx[i0*3+1] > mxy { mxy = vx[i0*3+1] }
      if vx[i0*3+2] < mn2 { mn2 = vx[i0*3+2] }
      if vx[i0*3+2] > mx2 { mx2 = vx[i0*3+2] }
      i0 = i0 + 1
  }
  let H: i64 = mx2 - mn2
  let cx: i64 = (mnx + mxx)/2
  let cy: i64 = (mny + mxy)/2
  // rows: y01 from 775 (above bust, armpit line -- strapless top edge) down to 370
  // (mid-thigh); per row measure the body's MAX radius from the axis within the band
  // (torso only: |x-cx| < .16H so T-pose arms never inflate the top rows) + ease
  let rowz: *i64 = sys_mmap(GV*8 + 64) as *i64
  let rowr: *i64 = sys_mmap(GV*8 + 64) as *i64
  var r0: i64 = 0
  while r0 < GV {
      let y01: i64 = 758 - r0*388/(GV-1)
      rowz[r0] = mn2 + H*y01/1000
      var best: i64 = 0
      var i1: i64 = 0
      while i1 < nv {
          let dz9: i64 = vx[i1*3+2] - rowz[r0]
          var az9: i64 = dz9
          if az9 < 0 { az9 = 0 - az9 }
          if az9 < H*12/1000 {
              let dx9: i64 = vx[i1*3] - cx
              let dy9: i64 = vx[i1*3+1] - cy
              var ax9: i64 = dx9
              if ax9 < 0 { ax9 = 0 - ax9 }
              if ax9 < H*115/1000 {
                  let rr9: i64 = dx9*dx9 + dy9*dy9
                  if rr9 > best { best = rr9 }
              }
          }
          i1 = i1 + 1
      }
      // isqrt via itrig-free Newton (small local)
      var xq: i64 = K_MAGIC_4096
      if best > K_MAGIC_100000000 { xq = K_MAGIC_65536 }
      var itn: i64 = 0
      while itn < 30 {
          if xq > 0 { let yq: i64 = (xq + best/xq)/2; if yq > 0 { xq = yq } }
          itn = itn + 1
      }
      // ease (pattern-making literature): a fitted woven skirt carries 5-10cm of hip ease
      // -- on this figure's ~105cm hip that is 5-9pct. Surplus fabric is what BUCKLES into
      // folds; a zero-ease shrink-wrap can only cone. Flare grows over the last 7 rows.
      var ease: i64 = 62
      if r0 > GV-8 { ease = 62 + (r0-(GV-8))*48 }
      rowr[r0] = xq + xq*ease/1000
      r0 = r0 + 1
  }
  gw9("rows=" as *u8); gn9(GV)
  gw9(" r_top=" as *u8); gn9(rowr[0])
  gw9(" r_hip=" as *u8); gn9(rowr[12])
  gw9(" r_hem=" as *u8); gn9(rowr[GV-1]); gw9("\n" as *u8)
  // build ring-grid mesh: GU columns x GV rows; slight ellipse (y depth 82pct of x width)
  let gnv: i64 = GU*GV
  let gvp: *i64 = sys_mmap((1 + gnv*3)*8 + 64) as *i64
  gvp[0] = gnv
  var rr0: i64 = 0
  while rr0 < GV {
      var u0: i64 = 0
      while u0 < GU {
          let ang: i64 = u0*2*IT_PI/GU
          let cs9: i64 = it_cos4096(ang)
          let sn9b: i64 = it_sin4096(ang)
          let idx: i64 = (rr0*GU + u0)*3
          gvp[1 + idx] = cx + rowr[rr0]*cs9/K_MAGIC_4096
          gvp[1 + idx + 1] = cy + rowr[rr0]*82/100*sn9b/K_MAGIC_4096
          gvp[1 + idx + 2] = rowz[rr0]
          u0 = u0 + 1
      }
      rr0 = rr0 + 1
  }
  // tris: two per quad, wrapping in u
  let gnt: i64 = GU*(GV-1)*2
  let gtp: *i64 = sys_mmap((1 + gnt*3)*8 + 64) as *i64
  gtp[0] = gnt
  var tw9: i64 = 0
  var rr1: i64 = 0
  while rr1 < GV-1 {
      var u1: i64 = 0
      while u1 < GU {
          let a9: i64 = rr1*GU + u1
          var u2: i64 = u1 + 1
          if u2 >= GU { u2 = 0 }
          let b9: i64 = rr1*GU + u2
          let c9: i64 = (rr1+1)*GU + u1
          let d9: i64 = (rr1+1)*GU + u2
          gtp[1 + tw9*3] = a9
          gtp[1 + tw9*3 + 1] = c9
          gtp[1 + tw9*3 + 2] = b9
          tw9 = tw9 + 1
          gtp[1 + tw9*3] = b9
          gtp[1 + tw9*3 + 1] = c9
          gtp[1 + tw9*3 + 2] = d9
          tw9 = tw9 + 1
          u1 = u1 + 1
      }
      rr1 = rr1 + 1
  }
  // pins: the whole top row
  let gnp: i64 = GU
  let gpp: *i64 = sys_mmap((1 + gnp)*8 + 64) as *i64
  gpp[0] = gnp
  var p0: i64 = 0
  while p0 < gnp { gpp[1 + p0] = p0; p0 = p0 + 1 }
  gw9("garment verts=" as *u8); gn9(gnv)
  gw9(" tris=" as *u8); gn9(gnt)
  gw9(" pins=" as *u8); gn9(gnp); gw9("\n" as *u8)
  // append GVRT/GTRI/GPIN
  let ons: i64 = h[2]
  let otoc: *i64 = ((b as i64) + 32) as *i64
  let ns2: i64 = ons + 3
  let hdr: *i64 = sys_mmap(64) as *i64
  let toc: *i64 = sys_mmap(ns2*32 + 64) as *i64
  var o: i64 = 32 + ns2*32
  var ti: i64 = 0
  while ti < ons {
      toc[ti*4] = otoc[ti*4]
      toc[ti*4+1] = o
      toc[ti*4+2] = otoc[ti*4+2]
      toc[ti*4+3] = otoc[ti*4+3]
      o = o + otoc[ti*4+2]*8
      ti = ti + 1
  }
  let gvl: i64 = 1 + gnv*3
  let gtl: i64 = 1 + gnt*3
  let gpl: i64 = 1 + gnp
  toc[ti*4] = nxa_tag4("GVRT" as *u8)
  toc[ti*4+1] = o
  toc[ti*4+2] = gvl
  toc[ti*4+3] = nxa_check2(1, gvp, gvl)
  o = o + gvl*8
  ti = ti + 1
  toc[ti*4] = nxa_tag4("GTRI" as *u8)
  toc[ti*4+1] = o
  toc[ti*4+2] = gtl
  toc[ti*4+3] = nxa_check2(1, gtp, gtl)
  o = o + gtl*8
  ti = ti + 1
  toc[ti*4] = nxa_tag4("GPIN" as *u8)
  toc[ti*4+1] = o
  toc[ti*4+2] = gpl
  toc[ti*4+3] = nxa_check2(1, gpp, gpl)
  hdr[0] = nxa_magic()
  hdr[1] = NXA_VER
  hdr[2] = ns2
  hdr[3] = nxa_check2(1, toc, ns2*4)
  let fd: i64 = sys_openat_wr(argv[2] as *u8, 0x1a4)
  if fd < 0 { gw9("open out failed\n" as *u8); return 9 }
  sys_write(fd, hdr as *u8, 32)
  sys_write(fd, toc as *u8, ns2*32)
  var ci: i64 = 0
  while ci < ons {
      sys_write(fd, ((b as i64) + otoc[ci*4+1]) as *u8, otoc[ci*4+2]*8)
      ci = ci + 1
  }
  sys_write(fd, gvp as *u8, gvl*8)
  sys_write(fd, gtp as *u8, gtl*8)
  sys_write(fd, gpp as *u8, gpl*8)
  sys_close(fd)
  gw9("NXA+GARMENT written sections=" as *u8); gn9(ns2); gw9("\n" as *u8)
  return 0
220}
nx_nxa_garment.nx source

`nx_nxa_garment.nx` source
