diff options
author | yenatch <yenatch@gmail.com> | 2013-06-17 21:26:33 -0400 |
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committer | yenatch <yenatch@gmail.com> | 2013-06-17 21:30:36 -0400 |
commit | fb931fe616504a8cf141521dec6fc6f7d236bff8 (patch) | |
tree | e6903bcd9d6fcc884b791c432c15cb4464102aaf /joypad.asm | |
parent | 41dbd3b4a6f43439f691918815f26cfad9c06231 (diff) |
move miscellaneous asm into engine/
Diffstat (limited to 'joypad.asm')
-rw-r--r-- | joypad.asm | 275 |
1 files changed, 0 insertions, 275 deletions
diff --git a/joypad.asm b/joypad.asm deleted file mode 100644 index b9702d33a..000000000 --- a/joypad.asm +++ /dev/null @@ -1,275 +0,0 @@ -JoypadInt: ; 92e -; Replaced by Joypad, called from VBlank instead of the useless -; joypad interrupt. - -; This is a placeholder in case the interrupt is somehow enabled. - reti -; 92f - -ClearJoypadPublic: ; 92f - xor a -; Pressed this frame (delta) - ld [hJoyPressed], a -; Currently pressed - ld [hJoyDown], a - ret -; 935 - -Joypad: ; 935 -; Read the joypad register and translate it to something more -; workable for use in-game. There are 8 buttons, so we can use -; one byte to contain all player input. - -; Updates: - -; hJoypadReleased: released this frame (delta) -; hJoypadPressed: pressed this frame (delta) -; hJoypadDown: currently pressed -; hJoypadSum: pressed so far - -; Any of these three bits can be used to disable input. - ld a, [$cfbe] - and %11010000 - ret nz - -; If we're saving, input is disabled. - ld a, [$c2cd] - and a - ret nz - -; We can only get four inputs at a time. -; We take d-pad first for no particular reason. - ld a, D_PAD - ld [rJOYP], a -; Read twice to give the request time to take. - ld a, [rJOYP] - ld a, [rJOYP] - -; The Joypad register output is in the lo nybble (inversed). -; We make the hi nybble of our new container d-pad input. - cpl - and $f - swap a - -; We'll keep this in b for now. - ld b, a - -; Buttons make 8 total inputs (A, B, Select, Start). -; We can fit this into one byte. - ld a, BUTTONS - ld [rJOYP], a -; Wait for input to stabilize. - ld a, [rJOYP] - ld a, [rJOYP] - ld a, [rJOYP] - ld a, [rJOYP] - ld a, [rJOYP] - ld a, [rJOYP] -; Buttons take the lo nybble. - cpl - and $f - or b - ld b, a - -; Reset the joypad register since we're done with it. - ld a, $30 - ld [rJOYP], a - -; To get the delta we xor the last frame's input with the new one. - ld a, [hJoypadDown] ; last frame - ld e, a - xor b - ld d, a -; Released this frame: - and e - ld [hJoypadReleased], a -; Pressed this frame: - ld a, d - and b - ld [hJoypadPressed], a - -; Add any new presses to the list of collective presses: - ld c, a - ld a, [hJoypadSum] - or c - ld [hJoypadSum], a - -; Currently pressed: - ld a, b - ld [hJoypadDown], a - -; Now that we have the input, we can do stuff with it. - -; For example, soft reset: - and BUTTON_A | BUTTON_B | SELECT | START - cp BUTTON_A | BUTTON_B | SELECT | START - jp z, $0150 ; reset - - ret -; 984 - - -GetJoypadPublic: ; 984 -; Update mirror joypad input from hJoypadDown (real input) - -; hJoyReleased: released this frame (delta) -; hJoyPressed: pressed this frame (delta) -; hJoyDown: currently pressed - -; bit 0 A -; 1 B -; 2 SELECT -; 3 START -; 4 RIGHT -; 5 LEFT -; 6 UP -; 7 DOWN - - push af - push hl - push de - push bc - -; The player input can be automated using an input stream. -; See more below. - ld a, [InputType] - cp a, AUTO_INPUT - jr z, .auto - -; To get deltas, take this and last frame's input. - ld a, [hJoypadDown] ; real input - ld b, a - ld a, [hJoyDown] ; last frame mirror - ld e, a - -; Released this frame: - xor b - ld d, a - and e - ld [hJoyReleased], a - -; Pressed this frame: - ld a, d - and b - ld [hJoyPressed], a - -; It looks like the collective presses got commented out here. - ld c, a - -; Currently pressed: - ld a, b - ld [hJoyDown], a ; frame input - -.quit - pop bc - pop de - pop hl - pop af - ret - -.auto -; Use a predetermined input stream (used in the catching tutorial). - -; Stream format: [input][duration] -; A value of $ff will immediately end the stream. - -; Read from the input stream. - ld a, [hROMBank] - push af - ld a, [AutoInputBank] - rst Bankswitch - - ld hl, AutoInputAddress - ld a, [hli] - ld h, [hl] - ld l, a - -; We only update when the input duration has expired. - ld a, [AutoInputLength] - and a - jr z, .updateauto - -; Until then, don't change anything. - dec a - ld [AutoInputLength], a - pop af - rst Bankswitch - jr .quit - - -.updateauto -; An input of $ff will end the stream. - ld a, [hli] - cp a, $ff - jr z, .stopauto - ld b, a - -; A duration of $ff will end the stream indefinitely. - ld a, [hli] - ld [AutoInputLength], a - cp a, $ff - jr nz, .next - -; The current input is overwritten. - dec hl - dec hl - ld b, NO_INPUT - jr .finishauto - -.next -; On to the next input... - ld a, l - ld [AutoInputAddress], a - ld a, h - ld [AutoInputAddress+1], a - jr .finishauto - -.stopauto - call StopAutoInput - ld b, NO_INPUT - -.finishauto - pop af - rst Bankswitch - ld a, b - ld [hJoyPressed], a ; pressed - ld [hJoyDown], a ; input - jr .quit -; 9ee - - -StartAutoInput: ; 9ee -; Start reading automated input stream at a:hl. - - ld [AutoInputBank], a - ld a, l - ld [AutoInputAddress], a - ld a, h - ld [AutoInputAddress+1], a -; Start reading the stream immediately. - xor a - ld [AutoInputLength], a -; Reset input mirrors. - xor a - ld [hJoyPressed], a ; pressed this frame - ld [hJoyReleased], a ; released this frame - ld [hJoyDown], a ; currently pressed - - ld a, AUTO_INPUT - ld [InputType], a - ret -; a0a - - -StopAutoInput: ; a0a -; Clear variables related to automated input. - xor a - ld [AutoInputBank], a - ld [AutoInputAddress], a - ld [AutoInputAddress+1], a - ld [AutoInputLength], a -; Back to normal input. - ld [InputType], a - ret -; a1b - |