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Elite on the BBC Micro

Version analysis of SHIP_ROCK_HERMIT

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_ROCK_HERMIT Type: Variable Category: Drawing ships Summary: Ship blueprint for a rock hermit (asteroid) Deep dive: Ship blueprints

Code variation 1 of 4A variation in the comments only

This variation is blank in the 6502 Second Processor version.

Master

The ship blueprint for the rock hermit reuses the edges and faces data from the asteroid, so the edges and faces data offsets are negative.
.SHIP_ROCK_HERMIT EQUB 7 \ Max. canisters on demise = 7 EQUW 80 * 80 \ Targetable area = 80 * 80

Code variation 2 of 4Specific to an individual platform

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

Master

6502SP

EQUB LO(SHIP_ASTEROID_EDGES - SHIP_ROCK_HERMIT) \ Edges from asteroid EQUB LO(SHIP_ASTEROID_FACES - SHIP_ROCK_HERMIT) \ Faces from asteroid
EQUB LO(SHIP_ROCK_HERMIT_EDGES - SHIP_ROCK_HERMIT) \ Edges data offset (low) EQUB LO(SHIP_ROCK_HERMIT_FACES - SHIP_ROCK_HERMIT) \ Faces data offset (low)
 EQUB 69                \ Max. edge count          = (69 - 1) / 4 = 17
 EQUB 0                 \ Gun vertex               = 0
 EQUB 50                \ Explosion count          = 11, as (4 * n) + 6 = 50
 EQUB 54                \ Number of vertices       = 54 / 6 = 9
 EQUB 21                \ Number of edges          = 21
 EQUW 0                 \ Bounty                   = 0
 EQUB 56                \ Number of faces          = 56 / 4 = 14
 EQUB 50                \ Visibility distance      = 50
 EQUB 180               \ Max. energy              = 180
 EQUB 30                \ Max. speed               = 30

Code variation 3 of 4Specific to an individual platform

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

Master

6502SP

EQUB HI(SHIP_ASTEROID_EDGES - SHIP_ROCK_HERMIT) \ Edges from asteroid EQUB HI(SHIP_ASTEROID_FACES - SHIP_ROCK_HERMIT) \ Faces from asteroid
EQUB HI(SHIP_ROCK_HERMIT_EDGES - SHIP_ROCK_HERMIT) \ Edges data offset (high) EQUB HI(SHIP_ROCK_HERMIT_FACES - SHIP_ROCK_HERMIT) \ Faces data offset (high)
 EQUB 1                 \ Normals are scaled by    = 2^1 = 2
 EQUB %00000010         \ Laser power              = 0
                        \ Missiles                 = 2

\VERTEX    x,    y,    z, face1, face2, face3, face4, visibility
 VERTEX    0,   80,    0,    15,     15,   15,    15,         31    \ Vertex 0
 VERTEX  -80,  -10,    0,    15,     15,   15,    15,         31    \ Vertex 1
 VERTEX    0,  -80,    0,    15,     15,   15,    15,         31    \ Vertex 2
 VERTEX   70,  -40,    0,    15,     15,   15,    15,         31    \ Vertex 3
 VERTEX   60,   50,    0,     5,      6,   12,    13,         31    \ Vertex 4
 VERTEX   50,    0,   60,    15,     15,   15,    15,         31    \ Vertex 5
 VERTEX  -40,    0,   70,     0,      1,    2,     3,         31    \ Vertex 6
 VERTEX    0,   30,  -75,    15,     15,   15,    15,         31    \ Vertex 7
 VERTEX    0,  -50,  -60,     8,      9,   10,    11,         31    \ Vertex 8

Code variation 4 of 4Specific to an individual platform

This variation is blank in the Master version.

6502SP

.SHIP_ROCK_HERMIT_EDGES \EDGE vertex1, vertex2, face1, face2, visibility EDGE 0, 1, 2, 7, 31 \ Edge 0 EDGE 0, 4, 6, 13, 31 \ Edge 1 EDGE 3, 4, 5, 12, 31 \ Edge 2 EDGE 2, 3, 4, 11, 31 \ Edge 3 EDGE 1, 2, 3, 10, 31 \ Edge 4 EDGE 1, 6, 2, 3, 31 \ Edge 5 EDGE 2, 6, 1, 3, 31 \ Edge 6 EDGE 2, 5, 1, 4, 31 \ Edge 7 EDGE 5, 6, 0, 1, 31 \ Edge 8 EDGE 0, 5, 0, 6, 31 \ Edge 9 EDGE 3, 5, 4, 5, 31 \ Edge 10 EDGE 0, 6, 0, 2, 31 \ Edge 11 EDGE 4, 5, 5, 6, 31 \ Edge 12 EDGE 1, 8, 8, 10, 31 \ Edge 13 EDGE 1, 7, 7, 8, 31 \ Edge 14 EDGE 0, 7, 7, 13, 31 \ Edge 15 EDGE 4, 7, 12, 13, 31 \ Edge 16 EDGE 3, 7, 9, 12, 31 \ Edge 17 EDGE 3, 8, 9, 11, 31 \ Edge 18 EDGE 2, 8, 10, 11, 31 \ Edge 19 EDGE 7, 8, 8, 9, 31 \ Edge 20 .SHIP_ROCK_HERMIT_FACES \FACE normal_x, normal_y, normal_z, visibility FACE 9, 66, 81, 31 \ Face 0 FACE 9, -66, 81, 31 \ Face 1 FACE -72, 64, 31, 31 \ Face 2 FACE -64, -73, 47, 31 \ Face 3 FACE 45, -79, 65, 31 \ Face 4 FACE 135, 15, 35, 31 \ Face 5 FACE 38, 76, 70, 31 \ Face 6 FACE -66, 59, -39, 31 \ Face 7 FACE -67, -15, -80, 31 \ Face 8 FACE 66, -14, -75, 31 \ Face 9 FACE -70, -80, -40, 31 \ Face 10 FACE 58, -102, -51, 31 \ Face 11 FACE 81, 9, -67, 31 \ Face 12 FACE 47, 94, -63, 31 \ Face 13
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