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Elite on the BBC Micro

Version analysis of SHIP_MISSILE

This code appears in the following versions (click to see it in the source code):

Code variations between these versions are shown below.

Name: SHIP_MISSILE Type: Variable Category: Drawing ships Summary: Ship blueprint for a missile Deep dive: Ship blueprints
.SHIP_MISSILE EQUB 0 \ Max. canisters on demise = 0 EQUW 40 * 40 \ Targetable area = 40 * 40 EQUB LO(SHIP_MISSILE_EDGES - SHIP_MISSILE) \ Edges data offset (low) EQUB LO(SHIP_MISSILE_FACES - SHIP_MISSILE) \ Faces data offset (low)

Code variation 1 of 2Related to an advanced feature

The advanced versions of Elite have an extra edge count for the ship colour; missiles are shown in yellow.

Tap on a version to expand it, and tap it again to show to all variations.

Cassette, Flight, Electron

6502SP, Master

EQUB 81 \ Max. edge count = (81 - 1) / 4 = 20
EQUB 85 \ Max. edge count = (85 - 1) / 4 = 21
 EQUB 0                 \ Gun vertex               = 0
 EQUB 10                \ Explosion count          = 1, as (4 * n) + 6 = 10
 EQUB 102               \ Number of vertices       = 102 / 6 = 17
 EQUB 24                \ Number of edges          = 24
 EQUW 0                 \ Bounty                   = 0
 EQUB 36                \ Number of faces          = 36 / 4 = 9
 EQUB 14                \ Visibility distance      = 14
 EQUB 2                 \ Max. energy              = 2
 EQUB 44                \ Max. speed               = 44
 EQUB HI(SHIP_MISSILE_EDGES - SHIP_MISSILE)        \ Edges data offset (high)
 EQUB HI(SHIP_MISSILE_FACES - SHIP_MISSILE)        \ Faces data offset (high)
 EQUB 2                 \ Normals are scaled by    = 2^2 = 4
 EQUB %00000000         \ Laser power              = 0
                        \ Missiles                 = 0

\VERTEX    x,    y,    z, face1, face2, face3, face4, visibility
 VERTEX    0,    0,   68,     0,      1,    2,     3,         31    \ Vertex 0
 VERTEX    8,   -8,   36,     1,      2,    4,     5,         31    \ Vertex 1
 VERTEX    8,    8,   36,     2,      3,    4,     7,         31    \ Vertex 2
 VERTEX   -8,    8,   36,     0,      3,    6,     7,         31    \ Vertex 3
 VERTEX   -8,   -8,   36,     0,      1,    5,     6,         31    \ Vertex 4
 VERTEX    8,    8,  -44,     4,      7,    8,     8,         31    \ Vertex 5
 VERTEX    8,   -8,  -44,     4,      5,    8,     8,         31    \ Vertex 6
 VERTEX   -8,   -8,  -44,     5,      6,    8,     8,         31    \ Vertex 7
 VERTEX   -8,    8,  -44,     6,      7,    8,     8,         31    \ Vertex 8
 VERTEX   12,   12,  -44,     4,      7,    8,     8,          8    \ Vertex 9
 VERTEX   12,  -12,  -44,     4,      5,    8,     8,          8    \ Vertex 10
 VERTEX  -12,  -12,  -44,     5,      6,    8,     8,          8    \ Vertex 11
 VERTEX  -12,   12,  -44,     6,      7,    8,     8,          8    \ Vertex 12
 VERTEX   -8,    8,  -12,     6,      7,    7,     7,          8    \ Vertex 13
 VERTEX   -8,   -8,  -12,     5,      6,    6,     6,          8    \ Vertex 14
 VERTEX    8,    8,  -12,     4,      7,    7,     7,          8    \ Vertex 15
 VERTEX    8,   -8,  -12,     4,      5,    5,     5,          8    \ Vertex 16

.SHIP_MISSILE_EDGES

\EDGE vertex1, vertex2, face1, face2, visibility
 EDGE       0,       1,     1,     2,         31    \ Edge 0
 EDGE       0,       2,     2,     3,         31    \ Edge 1
 EDGE       0,       3,     0,     3,         31    \ Edge 2
 EDGE       0,       4,     0,     1,         31    \ Edge 3
 EDGE       1,       2,     4,     2,         31    \ Edge 4
 EDGE       1,       4,     1,     5,         31    \ Edge 5
 EDGE       3,       4,     0,     6,         31    \ Edge 6
 EDGE       2,       3,     3,     7,         31    \ Edge 7
 EDGE       2,       5,     4,     7,         31    \ Edge 8
 EDGE       1,       6,     4,     5,         31    \ Edge 9
 EDGE       4,       7,     5,     6,         31    \ Edge 10
 EDGE       3,       8,     6,     7,         31    \ Edge 11
 EDGE       7,       8,     6,     8,         31    \ Edge 12
 EDGE       5,       8,     7,     8,         31    \ Edge 13
 EDGE       5,       6,     4,     8,         31    \ Edge 14
 EDGE       6,       7,     5,     8,         31    \ Edge 15
 EDGE       6,      10,     5,     8,          8    \ Edge 16
 EDGE       5,       9,     7,     8,          8    \ Edge 17
 EDGE       8,      12,     7,     8,          8    \ Edge 18
 EDGE       7,      11,     5,     8,          8    \ Edge 19
 EDGE       9,      15,     4,     7,          8    \ Edge 20
 EDGE      10,      16,     4,     5,          8    \ Edge 21
 EDGE      12,      13,     6,     7,          8    \ Edge 22
 EDGE      11,      14,     5,     6,          8    \ Edge 23

.SHIP_MISSILE_FACES

\FACE normal_x, normal_y, normal_z, visibility
 FACE      -64,        0,       16,         31    \ Face 0
 FACE        0,      -64,       16,         31    \ Face 1
 FACE       64,        0,       16,         31    \ Face 2
 FACE        0,       64,       16,         31    \ Face 3
 FACE       32,        0,        0,         31    \ Face 4
 FACE        0,      -32,        0,         31    \ Face 5
 FACE      -32,        0,        0,         31    \ Face 6

Code variation 2 of 2Related to the disc version

The data for faces 7 and 8 of the disc version's missile blueprint is quite different compared to the other versions.

Tap on a version to expand it, and tap it again to show to all variations.

Cassette, 6502SP, Master, Electron

Flight

FACE 0, 32, 0, 31 \ Face 7 FACE 0, 0, -176, 31 \ Face 8
FACE 0, 160, 110, 31 \ Face 7 FACE 0, 64, 4, 0 \ Face 8
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