Organize the engine/ directory

This is an informed attempt at reorganizing the engine/ directory by
creating categorized subdirectories, in order to make it easier to
navigate and find things.

The directories created are as follows:
* engine/game: Contains all "minigames", things like the unown puzzle
and slot machine.
* engine/gfx: Contains all handling of graphics. From loading palettes
to playing animations.
* engine/link: Contains all multiplayer functionality.
* engine/menu: Contains all generic/misc. menus and menu code.
Other, more specialized menus are in their own subdirectories (pokedex,
pokegear, party menu, etc).
* engine/overworld: Contains all handling of the overworld. From loading
and connecting maps to wild encounters and the scripting engine.
* engine/pokegear: In the same vein as engine/pokedex, except it could
use some more splitting up.
* engine/pokemon: Contains everything related to manipulating pokemon
data. From the pokemon storage system to evolution and mail.
* engine/printer: Contains everything related to printing things as well
as the printer communication.
* engine/title: Contains intro sequences, title screens and credits.

1 files changed, 196 insertions, 0 deletions

diff --git a/engine/routines/math.asm b/engine/routines/math.asm
new file mode 100755
index 000000000..0cd6b0b47
--- /dev/null
+++ b/engine/routines/math.asm
@@ -0,0 +1,196 @@
+_Multiply:: ; 66de
+
+; hMultiplier is one byte.
+	ld a, 8
+	ld b, a
+
+	xor a
+	ld [hProduct], a
+	ld [hMathBuffer + 1], a
+	ld [hMathBuffer + 2], a
+	ld [hMathBuffer + 3], a
+	ld [hMathBuffer + 4], a
+
+
+.loop
+	ld a, [hMultiplier]
+	srl a
+	ld [hMultiplier], a
+	jr nc, .next
+
+	ld a, [hMathBuffer + 4]
+	ld c, a
+	ld a, [hMultiplicand + 2]
+	add c
+	ld [hMathBuffer + 4], a
+
+	ld a, [hMathBuffer + 3]
+	ld c, a
+	ld a, [hMultiplicand + 1]
+	adc c
+	ld [hMathBuffer + 3], a
+
+	ld a, [hMathBuffer + 2]
+	ld c, a
+	ld a, [hMultiplicand + 0]
+	adc c
+	ld [hMathBuffer + 2], a
+
+	ld a, [hMathBuffer + 1]
+	ld c, a
+	ld a, [hProduct]
+	adc c
+	ld [hMathBuffer + 1], a
+
+.next
+	dec b
+	jr z, .done
+
+
+; hMultiplicand <<= 1
+
+	ld a, [hMultiplicand + 2]
+	add a
+	ld [hMultiplicand + 2], a
+
+	ld a, [hMultiplicand + 1]
+	rla
+	ld [hMultiplicand + 1], a
+
+	ld a, [hMultiplicand + 0]
+	rla
+	ld [hMultiplicand + 0], a
+
+	ld a, [hProduct]
+	rla
+	ld [hProduct], a
+
+	jr .loop
+
+
+.done
+	ld a, [hMathBuffer + 4]
+	ld [hProduct + 3], a
+
+	ld a, [hMathBuffer + 3]
+	ld [hProduct + 2], a
+
+	ld a, [hMathBuffer + 2]
+	ld [hProduct + 1], a
+
+	ld a, [hMathBuffer + 1]
+	ld [hProduct + 0], a
+
+	ret
+; 673e
+
+
+_Divide:: ; 673e
+	xor a
+	ld [hMathBuffer + 0], a
+	ld [hMathBuffer + 1], a
+	ld [hMathBuffer + 2], a
+	ld [hMathBuffer + 3], a
+	ld [hMathBuffer + 4], a
+
+	ld a, 9
+	ld e, a
+
+.loop
+	ld a, [hMathBuffer + 0]
+	ld c, a
+	ld a, [hDividend + 1]
+	sub c
+	ld d, a
+
+	ld a, [hDivisor]
+	ld c, a
+	ld a, [hDividend + 0]
+	sbc c
+	jr c, .next
+
+	ld [hDividend + 0], a
+
+	ld a, d
+	ld [hDividend + 1], a
+
+	ld a, [hMathBuffer + 4]
+	inc a
+	ld [hMathBuffer + 4], a
+
+	jr .loop
+
+.next
+	ld a, b
+	cp 1
+	jr z, .done
+
+	ld a, [hMathBuffer + 4]
+	add a
+	ld [hMathBuffer + 4], a
+
+	ld a, [hMathBuffer + 3]
+	rla
+	ld [hMathBuffer + 3], a
+
+	ld a, [hMathBuffer + 2]
+	rla
+	ld [hMathBuffer + 2], a
+
+	ld a, [hMathBuffer + 1]
+	rla
+	ld [hMathBuffer + 1], a
+
+	dec e
+	jr nz, .next2
+
+	ld e, 8
+	ld a, [hMathBuffer + 0]
+	ld [hDivisor], a
+	xor a
+	ld [hMathBuffer + 0], a
+
+	ld a, [hDividend + 1]
+	ld [hDividend + 0], a
+
+	ld a, [hDividend + 2]
+	ld [hDividend + 1], a
+
+	ld a, [hDividend + 3]
+	ld [hDividend + 2], a
+
+.next2
+	ld a, e
+	cp 1
+	jr nz, .okay
+	dec b
+
+.okay
+	ld a, [hDivisor]
+	srl a
+	ld [hDivisor], a
+
+	ld a, [hMathBuffer + 0]
+	rr a
+	ld [hMathBuffer + 0], a
+
+	jr .loop
+
+.done
+	ld a, [hDividend + 1]
+	ld [hDivisor], a
+
+	ld a, [hMathBuffer + 4]
+	ld [hDividend + 3], a
+
+	ld a, [hMathBuffer + 3]
+	ld [hDividend + 2], a
+
+	ld a, [hMathBuffer + 2]
+	ld [hDividend + 1], a
+
+	ld a, [hMathBuffer + 1]
+	ld [hDividend + 0], a
+
+	ret
+; 67c1