nx_entity_gate.nx source

1// nx_entity_gate.nx -- start of GAMEPLAY: entities with per-frame state on the sovereign 3D world. 5 creatures 2// wander (position updated each frame, bounce at edges), placed on the terrain, rendered as boxes via the world's 3// object primitive. 4 frames -> 2x2 contact sheet -> sovereign PNG (nx_png). The WORLD is static and the ENTITIES 4// move => proves entity state evolves per frame (not just camera). exit 0 = rendered. license_tier: ORIGINAL 5import "nx_syscalls.nx" 6import "nx_voxel_world.nx" 7import "nx_png.nx" 8 9const SW: i64 = 640 10const SH: i64 = 480 11const NE: i64 = 5 12 13func mk(seed: i64, n: i64, water: i64, maxh: i64, latsp: i64, 14 psin: i64, pcos: i64, ysin: i64, ycos: i64, push: i64, focal: i64, style: i64) -> *i64 { 15 let s: *i64 = sys_mmap(12 * 8) as *i64 16 s[0] = seed; s[1] = n; s[2] = water; s[3] = maxh; s[4] = latsp 17 s[5] = psin; s[6] = pcos; s[7] = ysin; s[8] = ycos; s[9] = push; s[10] = focal; s[11] = style 18 return s 19} 20 21func main() -> i64 { 22 let fb: *i64 = sys_mmap(world_fb_bytes()) as *i64 23 let zb: *i64 = sys_mmap(world_fb_bytes()) as *i64 24 let sheet: *i64 = sys_mmap(SW * SH * 8) as *i64 25 var s: i64 = 0 26 while s < SW * SH { sheet[s] = world_sky(); s = s + 1 } 27 let R: *i64 = sys_mmap(128) as *i64 28 let sp: *i64 = mk(7, 14, 1, 6, 4, 574, 819, 574, 819, 24, 300, 0) 29 30 // entity state: position + x-velocity + colour. 31 let ex: *i64 = sys_mmap(NE * 8) as *i64 32 let ez: *i64 = sys_mmap(NE * 8) as *i64 33 let ev: *i64 = sys_mmap(NE * 8) as *i64 34 let ec: *i64 = sys_mmap(NE * 8) as *i64 35 ex[0] = 2; ez[0] = 4; ev[0] = 1; ec[0] = 226 + 70 * 256 + 70 * 65536 36 ex[1] = 10; ez[1] = 6; ev[1] = 0 - 1; ec[1] = 180 + 90 * 256 + 226 * 65536 37 ex[2] = 4; ez[2] = 9; ev[2] = 1; ec[2] = 240 + 170 * 256 + 60 * 65536 38 ex[3] = 9; ez[3] = 11; ev[3] = 0 - 1; ec[3] = 235 + 120 * 256 + 190 * 65536 39 ex[4] = 6; ez[4] = 2; ev[4] = 1; ec[4] = 90 + 210 * 256 + 220 * 65536 40 41 var f: i64 = 0 42 while f < 4 { 43 render_world(sp, fb, zb) 44 build_cam(sp, R) 45 var k: i64 = 0 46 while k < NE { 47 let cy: i64 = world_height(sp, ex[k], ez[k]) 48 world_obox(sp, fb, zb, R, ex[k], cy, ez[k], 1, 3, 1, ec[k], 0) // a standing creature (taller = visible) 49 k = k + 1 50 } 51 // composite this frame into the sheet (col=f%2, row=f/2). 52 let qx: i64 = (f % 2) * 320 53 let qy: i64 = (f / 2) * 240 54 var y: i64 = 0 55 while y < 240 { 56 var x: i64 = 0 57 while x < 320 { 58 sheet[(qy + y) * SW + (qx + x)] = fb[y * 320 + x] 59 x = x + 1 60 } 61 y = y + 1 62 } 63 // per-frame UPDATE: move + bounce off the world edges. 64 k = 0 65 while k < NE { 66 var nx: i64 = ex[k] + ev[k] 67 if nx < 1 { nx = 1; ev[k] = 0 - ev[k] } 68 if nx > 12 { nx = 12; ev[k] = 0 - ev[k] } 69 ex[k] = nx 70 k = k + 1 71 } 72 f = f + 1 73 } 74 write_png(sheet, SW, SH, "web_assets/_game_build/world_entities.png" as *u8) 75 return 0 76}