nx_anim_gate.nx source

1// nx_anim_gate.nx -- proves the per-frame render LOOP (basis of real-time): render the world at 4 yaw angles 2// (a 90deg sweep) by varying the spec's camera, composite into one 2x2 contact sheet. Same render_world, just a 3// loop over frames -> motion. Reuses nx_voxel_world (no new render code). exit 0 = rendered. license_tier: ORIGINAL 4import "nx_syscalls.nx" 5import "nx_voxel_world.nx" 6 7const SW: i64 = 640 8const SH: i64 = 480 9 10func mk(seed: i64, n: i64, water: i64, maxh: i64, latsp: i64, 11 psin: i64, pcos: i64, ysin: i64, ycos: i64, push: i64, focal: i64, style: i64) -> *i64 { 12 let s: *i64 = sys_mmap(12 * 8) as *i64 13 s[0] = seed; s[1] = n; s[2] = water; s[3] = maxh; s[4] = latsp 14 s[5] = psin; s[6] = pcos; s[7] = ysin; s[8] = ycos; s[9] = push; s[10] = focal; s[11] = style 15 return s 16} 17func put_u32le(b: *u8, o: i64, v: i64) -> i64 { 18 b[o] = (v & 0xff) as u8 19 b[o + 1] = ((v >> 8) & 0xff) as u8 20 b[o + 2] = ((v >> 16) & 0xff) as u8 21 b[o + 3] = ((v >> 24) & 0xff) as u8 22 return 0 23} 24func write_sheet(fb: *i64, path: *u8) -> i64 { 25 let pix: i64 = SW * SH * 3 26 let total: i64 = 54 + pix 27 let b: *u8 = sys_mmap(total) as *u8 28 b[0] = 66 as u8 29 b[1] = 77 as u8 30 put_u32le(b, 2, total) 31 put_u32le(b, 10, 54) 32 put_u32le(b, 14, 40) 33 put_u32le(b, 18, SW) 34 put_u32le(b, 22, SH) 35 b[26] = 1 as u8 36 b[28] = 24 as u8 37 put_u32le(b, 34, pix) 38 var o: i64 = 54 39 var ry: i64 = 0 40 while ry < SH { 41 let syrow: i64 = SH - 1 - ry 42 var x: i64 = 0 43 while x < SW { 44 let c: i64 = fb[syrow * SW + x] 45 b[o] = ((c >> 16) & 0xff) as u8 46 b[o + 1] = ((c >> 8) & 0xff) as u8 47 b[o + 2] = (c & 0xff) as u8 48 o = o + 3 49 x = x + 1 50 } 51 ry = ry + 1 52 } 53 let fd: i64 = sys_openat_wr(path, 0x1a4) 54 if fd < 0 { return 0 - 1 } 55 sys_write(fd, b, total) 56 sys_close(fd) 57 return 0 58} 59 60func main() -> i64 { 61 let fb: *i64 = sys_mmap(world_fb_bytes()) as *i64 62 let zb: *i64 = sys_mmap(world_fb_bytes()) as *i64 63 let sheet: *i64 = sys_mmap(SW * SH * 8) as *i64 64 var i: i64 = 0 65 while i < SW * SH { sheet[i] = world_sky(); i = i + 1 } 66 67 let ycos: *i64 = sys_mmap(4 * 8) as *i64 68 let ysin: *i64 = sys_mmap(4 * 8) as *i64 69 ycos[0] = 1000; ysin[0] = 0 70 ycos[1] = 866; ysin[1] = 500 71 ycos[2] = 500; ysin[2] = 866 72 ycos[3] = 0; ysin[3] = 1000 73 74 var f: i64 = 0 75 while f < 4 { 76 render_world(mk(7, 14, 1, 6, 4, 574, 819, ysin[f], ycos[f], 24, 300, 0), fb, zb) 77 // composite the 320x240 frame into quadrant (col=f%2, row=f/2) of the sheet. 78 let qx: i64 = (f % 2) * 320 79 let qy: i64 = (f / 2) * 240 80 var y: i64 = 0 81 while y < 240 { 82 var x: i64 = 0 83 while x < 320 { 84 sheet[(qy + y) * SW + (qx + x)] = fb[y * 320 + x] 85 x = x + 1 86 } 87 y = y + 1 88 } 89 f = f + 1 90 } 91 write_sheet(sheet, "web_assets/_game_build/world_anim.bmp" as *u8) 92 return 0 93}