nx_raycast_voxel_test.nx source

1// nx_raycast_voxel_test.nx -- smoke for nx_raycast_voxel. 2 3import "nx_syscalls.nx" 4import "nx_palette.nx" 5import "nx_tissue.nx" 6import "nx_raycast_voxel.nx" 7 8func main() -> i64 { 9 if NX_RF_N_FACES != 7 { return 1 } 10 if nx_rf_is_valid(NX_RF_X_POS) != 1 { return 2 } 11 if nx_rf_is_valid(7) != 0 { return 3 } 12 13 // 8x8x8 world with stone block at (3,3,3) 14 let world: *NxTissue = nx_tissue_new(8, 8, 8, NX_BPP_3) 15 nx_tissue_set(world, 3, 3, 3, 1) 16 17 // Ray from (0.5, 3.5, 3.5) heading +X at unit speed 18 let ray: *NxRay = nx_ray_new( 19 8192, 57344, 57344, // 0.5, 3.5, 3.5 in Q14 20 NX_RV_Q14, 0, 0, // +X unit 21 16) 22 let hit: *NxRayHit = (sys_mmap(56)) as *NxRayHit 23 let v: nx_int = nx_raycast_voxel(ray, world, hit) 24 if v != NX_RV_HIT { return 4 } 25 if hit.hit_x != 3 { return 5 } 26 if hit.hit_y != 3 { return 6 } 27 if hit.hit_z != 3 { return 7 } 28 if hit.palette_idx != 1 { return 8 } 29 if hit.face != NX_RF_X_NEG { return 9 } // ray entered from -X side 30 31 // Ray pointing AWAY from any block (in empty world direction) 32 let world2: *NxTissue = nx_tissue_new(8, 8, 8, NX_BPP_3) 33 // no blocks placed 34 let ray2: *NxRay = nx_ray_new(8192, 8192, 8192, 35 NX_RV_Q14, 0, 0, 16) 36 let hit2: *NxRayHit = (sys_mmap(56)) as *NxRayHit 37 let v2: nx_int = nx_raycast_voxel(ray2, world2, hit2) 38 // Either MAX_STEPS or OUT_OF_BOX (depends on where ray exits) 39 if v2 == NX_RV_HIT { return 10 } 40 41 // Ray hitting Y face 42 let world3: *NxTissue = nx_tissue_new(8, 8, 8, NX_BPP_3) 43 nx_tissue_set(world3, 1, 4, 1, 2) 44 let ray3: *NxRay = nx_ray_new( 45 24576, 8192, 24576, // 1.5, 0.5, 1.5 46 0, NX_RV_Q14, 0, // +Y direction 47 16) 48 let hit3: *NxRayHit = (sys_mmap(56)) as *NxRayHit 49 let v3: nx_int = nx_raycast_voxel(ray3, world3, hit3) 50 if v3 != NX_RV_HIT { return 11 } 51 if hit3.hit_y != 4 { return 12 } 52 if hit3.face != NX_RF_Y_NEG { return 13 } 53 if hit3.palette_idx != 2 { return 14 } 54 55 // Max steps exhaustion 56 let world4: *NxTissue = nx_tissue_new(8, 8, 8, NX_BPP_3) 57 let ray4: *NxRay = nx_ray_new(8192, 8192, 8192, 58 NX_RV_Q14, 0, 0, 2) 59 let hit4: *NxRayHit = (sys_mmap(56)) as *NxRayHit 60 let v4: nx_int = nx_raycast_voxel(ray4, world4, hit4) 61 if v4 == NX_RV_HIT { return 15 } 62 63 // Face-normal helper: hit.face was X_NEG (ray going +X entered -X face) 64 // so outward normal is -X = -Q14 65 let nx_q14: *i64 = (sys_mmap(8)) as *i64 66 let ny_q14: *i64 = (sys_mmap(8)) as *i64 67 let nz_q14: *i64 = (sys_mmap(8)) as *i64 68 nx_ray_hit_face_normal_q14(hit, nx_q14, ny_q14, nz_q14) 69 if nx_q14[0] != 0 - NX_RV_Q14 { return 16 } 70 if ny_q14[0] != 0 { return 17 } 71 if nz_q14[0] != 0 { return 18 } 72 73 return 0 74}