55 lines
1.4 KiB
NASM
55 lines
1.4 KiB
NASM
; -----------------------------------------------------------
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; tables.asm - perspective and speed tables, generated at
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; assembly time; t is the rabbit's distance (0 = horizon,
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; 255 = the player's line)
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; -----------------------------------------------------------
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; feet y along the lane: linear from the horizon to the player
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ytab:
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!for i, 0, 255 {
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!byte 100 + (111*i) DIV 256
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}
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; horizontal fan-out on a t^2 curve (full offset of the outer
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; lanes; the inner lanes use half of it)
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offtab:
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!for i, 0, 255 {
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!byte (107*i*i) DIV 65536
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}
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; hop wave, subtracted from the feet y (doubled for big rabbits)
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hoptab:
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!byte 0, 1, 2, 4, 4, 3, 2, 1
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; speed ramp: score (capped at 64) -> 16-bit speed bonus
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sptab_lo:
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!for i, 0, 64 {
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!byte <(i*13)
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}
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sptab_hi:
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!for i, 0, 64 {
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!byte >(i*13)
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}
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; scooter sprite x per lane (lane center - 24: the scooter is
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; double-sized, 48 wide); lane 4 crosses the 8-bit boundary,
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; pxhi is its MSB flag
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pxlo:
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!byte 54, 107, 160, 213, 10
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pxhi:
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!byte 0, 0, 0, 0, 1
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; rabbit slot -> sprite register offset (sprite = slot + 1)
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sprxreg:
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!byte 2, 4, 6, 8, 10, 12, 14
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; rabbit slot -> sprite enable/MSB/expand bit
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sprbit:
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!byte 2, 4, 8, 16, 32, 64, 128
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; road edge offset per row (0-18): exactly one column per row,
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; so the 45-degree edge glyphs join into one unbroken line on
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; both sides, from the apex down to the screen corners
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road_off:
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!byte 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18
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