mirror of https://github.com/pret/pokecrystal.git
163 lines
2.6 KiB
NASM
163 lines
2.6 KiB
NASM
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CalcLevel: ; 50e1b
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ld a, [TempMonSpecies]
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ld [CurSpecies], a
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call GetBaseData
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ld d, 1
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.next_level
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inc d
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ld a, d
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cp (MAX_LEVEL + 1) % $100
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jr z, .got_level
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call CalcExpAtLevel
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push hl
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ld hl, TempMonExp + 2
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ld a, [hProduct + 3]
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ld c, a
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ld a, [hld]
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sub c
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ld a, [hProduct + 2]
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ld c, a
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ld a, [hld]
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sbc c
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ld a, [hProduct + 1]
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ld c, a
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ld a, [hl]
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sbc c
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pop hl
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jr nc, .next_level
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.got_level
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dec d
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ret
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CalcExpAtLevel: ; 50e47
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; (a/b)*n**3 + c*n**2 + d*n - e
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ld a, [BaseGrowthRate]
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add a
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add a
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ld c, a
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ld b, 0
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ld hl, GrowthRates
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add hl, bc
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; Cube the level
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call .LevelSquared
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ld a, d
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ld [hMultiplier], a
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call Multiply
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; Multiply by a
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ld a, [hl]
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and $f0
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swap a
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ld [hMultiplier], a
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call Multiply
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; Divide by b
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ld a, [hli]
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and $f
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ld [hDivisor], a
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ld b, 4
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call Divide
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; Push the cubic term to the stack
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ld a, [hQuotient + 0]
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push af
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ld a, [hQuotient + 1]
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push af
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ld a, [hQuotient + 2]
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push af
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; Square the level and multiply by the lower 7 bits of c
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call .LevelSquared
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ld a, [hl]
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and $7f
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ld [hMultiplier], a
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call Multiply
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; Push the absolute value of the quadratic term to the stack
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ld a, [hProduct + 1]
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push af
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ld a, [hProduct + 2]
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push af
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ld a, [hProduct + 3]
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push af
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ld a, [hli]
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push af
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; Multiply the level by d
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xor a
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ld [hMultiplicand + 0], a
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ld [hMultiplicand + 1], a
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ld a, d
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ld [hMultiplicand + 2], a
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ld a, [hli]
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ld [hMultiplier], a
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call Multiply
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; Subtract e
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ld b, [hl]
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ld a, [hProduct + 3]
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sub b
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ld [hMultiplicand + 2], a
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ld b, $0
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ld a, [hProduct + 2]
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sbc b
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ld [hMultiplicand + 1], a
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ld a, [hProduct + 1]
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sbc b
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ld [hMultiplicand], a
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; If bit 7 of c is set, c is negative; otherwise, it's positive
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pop af
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and $80
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jr nz, .subtract
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; Add c*n**2 to (d*n - e)
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pop bc
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ld a, [hProduct + 3]
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add b
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ld [hMultiplicand + 2], a
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pop bc
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ld a, [hProduct + 2]
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adc b
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ld [hMultiplicand + 1], a
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pop bc
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ld a, [hProduct + 1]
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adc b
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ld [hMultiplicand], a
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jr .done_quadratic
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.subtract
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; Subtract c*n**2 from (d*n - e)
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pop bc
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ld a, [hProduct + 3]
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sub b
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ld [hMultiplicand + 2], a
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pop bc
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ld a, [hProduct + 2]
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sbc b
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ld [hMultiplicand + 1], a
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pop bc
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ld a, [hProduct + 1]
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sbc b
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ld [hMultiplicand], a
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.done_quadratic
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; Add (a/b)*n**3 to (d*n - e +/- c*n**2)
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pop bc
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ld a, [hProduct + 3]
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add b
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ld [hMultiplicand + 2], a
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pop bc
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ld a, [hProduct + 2]
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adc b
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ld [hMultiplicand + 1], a
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pop bc
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ld a, [hProduct + 1]
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adc b
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ld [hMultiplicand], a
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ret
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.LevelSquared: ; 50eed
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xor a
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ld [hMultiplicand + 0], a
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ld [hMultiplicand + 1], a
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ld a, d
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ld [hMultiplicand + 2], a
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ld [hMultiplier], a
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jp Multiply
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INCLUDE "data/growth_rates.asm"
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