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⌂ ∞ ▽ Elite on the 6502

Drawing ships: SHIP_THARGON

[NES version, Bank 1]

       Name: SHIP_THARGON                                            [Show more]
       Type: Variable
   Category: Drawing ships
    Summary: Ship blueprint for a Thargon
  Deep dive: Ship blueprints

    Context: See this variable in context in the source code
 References: This variable is used as follows:
             * Unused copy of XX21 uses SHIP_THARGON
             * XX21 uses SHIP_THARGON




 The ship blueprint for the Thargon reuses the edges data from the cargo
 canister, so the edges data offset is negative.



.SHIP_THARGON

 EQUB 0 + (15 << 4)     ; Max. canisters on demise = 0
                        ; Market item when scooped = 15 + 1 = 16 (alien items)
 EQUW 40 * 40           ; Targetable area          = 40 * 40

 EQUB LO(SHIP_CANISTER_EDGES - SHIP_THARGON)       ; Edges from canister
 EQUB LO(SHIP_THARGON_FACES - SHIP_THARGON)        ; Faces data offset (low)

 EQUB 69                ; Max. edge count          = (69 - 1) / 4 = 17
 EQUB 0                 ; Gun vertex               = 0
 EQUB 18                ; Explosion count          = 3, as (4 * n) + 6 = 18
 EQUB 60                ; Number of vertices       = 60 / 6 = 10
 EQUB 15                ; Number of edges          = 15
 EQUW 50                ; Bounty                   = 50
 EQUB 28                ; Number of faces          = 28 / 4 = 7
 EQUB 20                ; Visibility distance      = 20
 EQUB 20                ; Max. energy              = 20
 EQUB 30                ; Max. speed               = 30

 EQUB HI(SHIP_CANISTER_EDGES - SHIP_THARGON)       ; Edges from canister
 EQUB HI(SHIP_THARGON_FACES - SHIP_THARGON)        ; Faces data offset (high)

 EQUB 2                 ; Normals are scaled by    = 2^2 = 4
 EQUB %00010000         ; Laser power              = 2
                        ; Missiles                 = 0

.SHIP_THARGON_VERTICES

      ;    x,    y,    z, face1, face2, face3, face4, visibility
 VERTEX   -9,    0,   40,     1,      0,    5,     5,         31    ; Vertex 0
 VERTEX   -9,  -38,   12,     1,      0,    2,     2,         31    ; Vertex 1
 VERTEX   -9,  -24,  -32,     2,      0,    3,     3,         31    ; Vertex 2
 VERTEX   -9,   24,  -32,     3,      0,    4,     4,         31    ; Vertex 3
 VERTEX   -9,   38,   12,     4,      0,    5,     5,         31    ; Vertex 4
 VERTEX    9,    0,   -8,     5,      1,    6,     6,         31    ; Vertex 5
 VERTEX    9,  -10,  -15,     2,      1,    6,     6,         31    ; Vertex 6
 VERTEX    9,   -6,  -26,     3,      2,    6,     6,         31    ; Vertex 7
 VERTEX    9,    6,  -26,     4,      3,    6,     6,         31    ; Vertex 8
 VERTEX    9,   10,  -15,     5,      4,    6,     6,         31    ; Vertex 9

.SHIP_THARGON_FACES

    ; normal_x, normal_y, normal_z, visibility
 FACE      -36,        0,        0,         31      ; Face 0
 FACE       20,       -5,        7,         31      ; Face 1
 FACE       46,      -42,      -14,         31      ; Face 2
 FACE       36,        0,     -104,         31      ; Face 3
 FACE       46,       42,      -14,         31      ; Face 4
 FACE       20,        5,        7,         31      ; Face 5
 FACE       36,        0,        0,         31      ; Face 6