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Elite on the BBC Micro

Version analysis of SHIP_COBRA_MK_3_P

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_COBRA_MK_3_P Type: Variable Category: Drawing ships Summary: Ship blueprint for a Cobra Mk III (pirate) Deep dive: Ship blueprints

Code variation 1 of 5A variation in the comments only

This variation is blank in the Disc (flight) and 6502 Second Processor versions.

Master

The ship blueprint for the pirate Cobra Mk III reuses the edges and faces data from the non-pirate Cobra Mk III, so the edges and faces data offsets are negative.
.SHIP_COBRA_MK_3_P EQUB 1 \ Max. canisters on demise = 1 EQUW 95 * 95 \ Targetable area = 95 * 95

Code variation 2 of 5Specific to an individual platform

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Flight, 6502SP

Master

EQUB LO(SHIP_COBRA_MK_3_P_EDGES - SHIP_COBRA_MK_3_P) \ Edges data offset (low) EQUB LO(SHIP_COBRA_MK_3_P_FACES - SHIP_COBRA_MK_3_P) \ Faces data offset (low)
EQUB LO(SHIP_COBRA_MK_3_EDGES - SHIP_COBRA_MK_3_P) \ Edges from Cobra Mk III EQUB LO(SHIP_COBRA_MK_3_FACES - SHIP_COBRA_MK_3_P) \ Faces from Cobra Mk III

Code variation 3 of 5Related to an advanced feature

The advanced versions of Elite have an extra edge count for the ship colour; Cobra pirates are shown in cyan.

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

Flight

6502SP, Master

EQUB 153 \ Max. edge count = (153 - 1) / 4 = 38
EQUB 157 \ Max. edge count = (157 - 1) / 4 = 39
 EQUB 84                \ Gun vertex               = 84 / 4 = 21
 EQUB 42                \ Explosion count          = 9, as (4 * n) + 6 = 42
 EQUB 168               \ Number of vertices       = 168 / 6 = 28
 EQUB 38                \ Number of edges          = 38
 EQUW 175               \ Bounty                   = 175
 EQUB 52                \ Number of faces          = 52 / 4 = 13
 EQUB 50                \ Visibility distance      = 50
 EQUB 150               \ Max. energy              = 150
 EQUB 28                \ Max. speed               = 28

Code variation 4 of 5Specific to an individual platform

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Flight, 6502SP

Master

EQUB HI(SHIP_COBRA_MK_3_P_EDGES - SHIP_COBRA_MK_3_P) \ Edges data offset (high) EQUB HI(SHIP_COBRA_MK_3_P_FACES - SHIP_COBRA_MK_3_P) \ Faces data offset (high)
EQUB HI(SHIP_COBRA_MK_3_EDGES - SHIP_COBRA_MK_3_P) \ Edges from Cobra Mk III EQUB HI(SHIP_COBRA_MK_3_FACES - SHIP_COBRA_MK_3_P) \ Faces from Cobra Mk III
 EQUB 1                 \ Normals are scaled by    = 2^1 = 2
 EQUB %00010010         \ Laser power              = 2
                        \ Missiles                 = 2

\VERTEX    x,    y,    z, face1, face2, face3, face4, visibility
 VERTEX   32,    0,   76,    15,     15,   15,    15,         31    \ Vertex 0
 VERTEX  -32,    0,   76,    15,     15,   15,    15,         31    \ Vertex 1
 VERTEX    0,   26,   24,    15,     15,   15,    15,         31    \ Vertex 2
 VERTEX -120,   -3,   -8,     3,      7,   10,    10,         31    \ Vertex 3
 VERTEX  120,   -3,   -8,     4,      8,   12,    12,         31    \ Vertex 4
 VERTEX  -88,   16,  -40,    15,     15,   15,    15,         31    \ Vertex 5
 VERTEX   88,   16,  -40,    15,     15,   15,    15,         31    \ Vertex 6
 VERTEX  128,   -8,  -40,     8,      9,   12,    12,         31    \ Vertex 7
 VERTEX -128,   -8,  -40,     7,      9,   10,    10,         31    \ Vertex 8
 VERTEX    0,   26,  -40,     5,      6,    9,     9,         31    \ Vertex 9
 VERTEX  -32,  -24,  -40,     9,     10,   11,    11,         31    \ Vertex 10
 VERTEX   32,  -24,  -40,     9,     11,   12,    12,         31    \ Vertex 11
 VERTEX  -36,    8,  -40,     9,      9,    9,     9,         20    \ Vertex 12
 VERTEX   -8,   12,  -40,     9,      9,    9,     9,         20    \ Vertex 13
 VERTEX    8,   12,  -40,     9,      9,    9,     9,         20    \ Vertex 14
 VERTEX   36,    8,  -40,     9,      9,    9,     9,         20    \ Vertex 15
 VERTEX   36,  -12,  -40,     9,      9,    9,     9,         20    \ Vertex 16
 VERTEX    8,  -16,  -40,     9,      9,    9,     9,         20    \ Vertex 17
 VERTEX   -8,  -16,  -40,     9,      9,    9,     9,         20    \ Vertex 18
 VERTEX  -36,  -12,  -40,     9,      9,    9,     9,         20    \ Vertex 19
 VERTEX    0,    0,   76,     0,     11,   11,    11,          6    \ Vertex 20
 VERTEX    0,    0,   90,     0,     11,   11,    11,         31    \ Vertex 21
 VERTEX  -80,   -6,  -40,     9,      9,    9,     9,          8    \ Vertex 22
 VERTEX  -80,    6,  -40,     9,      9,    9,     9,          8    \ Vertex 23
 VERTEX  -88,    0,  -40,     9,      9,    9,     9,          6    \ Vertex 24
 VERTEX   80,    6,  -40,     9,      9,    9,     9,          8    \ Vertex 25
 VERTEX   88,    0,  -40,     9,      9,    9,     9,          6    \ Vertex 26
 VERTEX   80,   -6,  -40,     9,      9,    9,     9,          8    \ Vertex 27

Code variation 5 of 5Specific to an individual platform

This variation is blank in the Master version.

Flight, 6502SP

.SHIP_COBRA_MK_3_P_EDGES \EDGE vertex1, vertex2, face1, face2, visibility EDGE 0, 1, 0, 11, 31 \ Edge 0 EDGE 0, 4, 4, 12, 31 \ Edge 1 EDGE 1, 3, 3, 10, 31 \ Edge 2 EDGE 3, 8, 7, 10, 31 \ Edge 3 EDGE 4, 7, 8, 12, 31 \ Edge 4 EDGE 6, 7, 8, 9, 31 \ Edge 5 EDGE 6, 9, 6, 9, 31 \ Edge 6 EDGE 5, 9, 5, 9, 31 \ Edge 7 EDGE 5, 8, 7, 9, 31 \ Edge 8 EDGE 2, 5, 1, 5, 31 \ Edge 9 EDGE 2, 6, 2, 6, 31 \ Edge 10 EDGE 3, 5, 3, 7, 31 \ Edge 11 EDGE 4, 6, 4, 8, 31 \ Edge 12 EDGE 1, 2, 0, 1, 31 \ Edge 13 EDGE 0, 2, 0, 2, 31 \ Edge 14 EDGE 8, 10, 9, 10, 31 \ Edge 15 EDGE 10, 11, 9, 11, 31 \ Edge 16 EDGE 7, 11, 9, 12, 31 \ Edge 17 EDGE 1, 10, 10, 11, 31 \ Edge 18 EDGE 0, 11, 11, 12, 31 \ Edge 19 EDGE 1, 5, 1, 3, 29 \ Edge 20 EDGE 0, 6, 2, 4, 29 \ Edge 21 EDGE 20, 21, 0, 11, 6 \ Edge 22 EDGE 12, 13, 9, 9, 20 \ Edge 23 EDGE 18, 19, 9, 9, 20 \ Edge 24 EDGE 14, 15, 9, 9, 20 \ Edge 25 EDGE 16, 17, 9, 9, 20 \ Edge 26 EDGE 15, 16, 9, 9, 19 \ Edge 27 EDGE 14, 17, 9, 9, 17 \ Edge 28 EDGE 13, 18, 9, 9, 19 \ Edge 29 EDGE 12, 19, 9, 9, 19 \ Edge 30 EDGE 2, 9, 5, 6, 30 \ Edge 31 EDGE 22, 24, 9, 9, 6 \ Edge 32 EDGE 23, 24, 9, 9, 6 \ Edge 33 EDGE 22, 23, 9, 9, 8 \ Edge 34 EDGE 25, 26, 9, 9, 6 \ Edge 35 EDGE 26, 27, 9, 9, 6 \ Edge 36 EDGE 25, 27, 9, 9, 8 \ Edge 37 .SHIP_COBRA_MK_3_P_FACES \FACE normal_x, normal_y, normal_z, visibility FACE 0, 62, 31, 31 \ Face 0 FACE -18, 55, 16, 31 \ Face 1 FACE 18, 55, 16, 31 \ Face 2 FACE -16, 52, 14, 31 \ Face 3 FACE 16, 52, 14, 31 \ Face 4 FACE -14, 47, 0, 31 \ Face 5 FACE 14, 47, 0, 31 \ Face 6 FACE -61, 102, 0, 31 \ Face 7 FACE 61, 102, 0, 31 \ Face 8 FACE 0, 0, -80, 31 \ Face 9 FACE -7, -42, 9, 31 \ Face 10 FACE 0, -30, 6, 31 \ Face 11 FACE 7, -42, 9, 31 \ Face 12
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