The SHIP_VIPER (Bank 1) variable - Elite on the BBC Micro and NES

       Name: SHIP_VIPER                                              [Show more]
       Type: Variable
   Category: Drawing ships
    Summary: Ship blueprint for a Viper
  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_VIPER
             * XX21 uses SHIP_VIPER


.SHIP_VIPER

 EQUB 0                 ; Max. canisters on demise = 0
 EQUW 75 * 75           ; Targetable area          = 75 * 75

 EQUB LO(SHIP_VIPER_EDGES - SHIP_VIPER)            ; Edges data offset (low)
 EQUB LO(SHIP_VIPER_FACES - SHIP_VIPER)            ; Faces data offset (low)

 EQUB 81                ; Max. edge count          = (81 - 1) / 4 = 20
 EQUB 0                 ; Gun vertex               = 0
 EQUB 42                ; Explosion count          = 9, as (4 * n) + 6 = 42
 EQUB 90                ; Number of vertices       = 90 / 6 = 15
 EQUB 20                ; Number of edges          = 20
 EQUW 0                 ; Bounty                   = 0
 EQUB 28                ; Number of faces          = 28 / 4 = 7
 EQUB 23                ; Visibility distance      = 23
 EQUB 140               ; Max. energy              = 140
 EQUB 32                ; Max. speed               = 32

 EQUB HI(SHIP_VIPER_EDGES - SHIP_VIPER)            ; Edges data offset (high)
 EQUB HI(SHIP_VIPER_FACES - SHIP_VIPER)            ; Faces data offset (high)

 EQUB 1                 ; Normals are scaled by    = 2^1 = 2
 EQUB %00010001         ; Laser power              = 2
                        ; Missiles                 = 1

.SHIP_VIPER_VERTICES

      ;    x,    y,    z, face1, face2, face3, face4, visibility
 VERTEX    0,    0,   72,     1,      2,    3,     4,         31    ; Vertex 0
 VERTEX    0,   16,   24,     0,      1,    2,     2,         30    ; Vertex 1
 VERTEX    0,  -16,   24,     3,      4,    5,     5,         30    ; Vertex 2
 VERTEX   48,    0,  -24,     2,      4,    6,     6,         31    ; Vertex 3
 VERTEX  -48,    0,  -24,     1,      3,    6,     6,         31    ; Vertex 4
 VERTEX   24,  -16,  -24,     4,      5,    6,     6,         30    ; Vertex 5
 VERTEX  -24,  -16,  -24,     5,      3,    6,     6,         30    ; Vertex 6
 VERTEX   24,   16,  -24,     0,      2,    6,     6,         31    ; Vertex 7
 VERTEX  -24,   16,  -24,     0,      1,    6,     6,         31    ; Vertex 8
 VERTEX  -32,    0,  -24,     6,      6,    6,     6,         19    ; Vertex 9
 VERTEX   32,    0,  -24,     6,      6,    6,     6,         19    ; Vertex 10
 VERTEX    8,    8,  -24,     6,      6,    6,     6,         19    ; Vertex 11
 VERTEX   -8,    8,  -24,     6,      6,    6,     6,         19    ; Vertex 12
 VERTEX   -8,   -8,  -24,     6,      6,    6,     6,         18    ; Vertex 13
 VERTEX    8,   -8,  -24,     6,      6,    6,     6,         18    ; Vertex 14

.SHIP_VIPER_EDGES

    ; vertex1, vertex2, face1, face2, visibility
 EDGE       0,       3,     2,     4,         31    ; Edge 0
 EDGE       0,       1,     1,     2,         30    ; Edge 1
 EDGE       0,       2,     3,     4,         30    ; Edge 2
 EDGE       0,       4,     1,     3,         31    ; Edge 3
 EDGE       1,       7,     0,     2,         30    ; Edge 4
 EDGE       1,       8,     0,     1,         30    ; Edge 5
 EDGE       2,       5,     4,     5,         30    ; Edge 6
 EDGE       2,       6,     3,     5,         30    ; Edge 7
 EDGE       7,       8,     0,     6,         31    ; Edge 8
 EDGE       5,       6,     5,     6,         30    ; Edge 9
 EDGE       4,       8,     1,     6,         31    ; Edge 10
 EDGE       4,       6,     3,     6,         30    ; Edge 11
 EDGE       3,       7,     2,     6,         31    ; Edge 12
 EDGE       3,       5,     6,     4,         30    ; Edge 13
 EDGE       9,      12,     6,     6,         19    ; Edge 14
 EDGE       9,      13,     6,     6,         18    ; Edge 15
 EDGE      10,      11,     6,     6,         19    ; Edge 16
 EDGE      10,      14,     6,     6,         18    ; Edge 17
 EDGE      11,      14,     6,     6,         16    ; Edge 18
 EDGE      12,      13,     6,     6,         16    ; Edge 19

.SHIP_VIPER_FACES

    ; normal_x, normal_y, normal_z, visibility
 FACE        0,       32,        0,         31    ; Face 0
 FACE      -22,       33,       11,         31    ; Face 1
 FACE       22,       33,       11,         31    ; Face 2
 FACE      -22,      -33,       11,         31    ; Face 3
 FACE       22,      -33,       11,         31    ; Face 4
 FACE        0,      -32,        0,         31    ; Face 5
 FACE        0,        0,      -48,         31    ; Face 6

[X]

Macro EDGE (category: Drawing ships)

Macro definition for adding edges to ship blueprints

[X]

Macro FACE (category: Drawing ships)

Macro definition for adding faces to ship blueprints

[X]

Variable SHIP_VIPER (category: Drawing ships)

Ship blueprint for a Viper

[X]

Label SHIP_VIPER_EDGES is local to this routine

[X]

Label SHIP_VIPER_FACES is local to this routine

[X]

Macro VERTEX (category: Drawing ships)

Macro definition for adding vertices to ship blueprints

Drawing ships: SHIP_VIPER

[NES version, Bank 1]