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[Core/IO] improved 6-buttons controller emulation (fixes 'ToeJam & Earl in Panic on Funkotron')

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This commit is contained in:
EkeEke 2018-08-11 02:09:13 +02:00
parent 3ec4b627e8
commit ee4494a815
5 changed files with 27 additions and 30 deletions
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builds/genesis_plus_gx_libretro.dll
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55
core/input_hw/gamepad.c
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@ -3,7 +3,7 @@
* 2-Buttons, 3-Buttons & 6-Buttons controller support
* with support for J-Cart, 4-Way Play & Master Tap adapters
*
* Copyright (C) 2007-2016 Eke-Eke (Genesis Plus GX)
* Copyright (C) 2007-2018 Eke-Eke (Genesis Plus GX)
*
* Redistribution and use of this code or any derivative works are permitted
* provided that the following conditions are met:
@ -122,35 +122,24 @@ INLINE unsigned char gamepad_read(int port)
/* D-PAD or extra buttons status is returned on D3-D0 (active low) */
switch (step)
{
case 1: /*** First High ***/
case 3: /*** Second High ***/
case 5: /*** Third High ***/
{
/* TH = 1 : ?1CBRLDU */
data &= ~(pad & 0x3F);
break;
}
/* From gen_hw.txt (*):
case 0: /*** 3-button only ***/
case 2: /*** First Low ***/
case 4: /*** Second Low ***/
{
/* TH = 0 : ?0SA00DU */
data &= ~((pad & 0x03) | ((pad >> 2) & 0x30) | 0x0C);
break;
}
A 6-button gamepad allows the extra buttons to be read based on how
many times TH is switched from (and not 0 to 1). Observe the
following sequence:
/* A 6-button gamepad allows the extra buttons to be read based on how */
/* many times TH is switched from 1 to 0. Observe the following sequence */
/*
TH = 1 : ?1CBRLDU 3-button pad return value
TH = 0 : ?0SA00DU 3-button pad return value
TH = 1 : ?1CBRLDU 3-button pad return value
TH = 0 : ?0SA00DU 3-button pad return value
TH = 1 : ?1CBRLDU 3-button pad return value (*)
TH = 0 : ?0SA00DU 3-button pad return value (*)
TH = 1 : ?1CBRLDU 3-button pad return value
TH = 0 : ?0SA0000 D3-D0 are forced to '0'
TH = 1 : ?1CBMXYZ Extra buttons returned in D3-0
TH = 0 : ?0SA1111 D3-D0 are forced to '1'
From this point on, the standard 3-button pad values will be returned if any further TH transitions are done.
(*) additional High-to-Low transition is necessary to access extra buttons according to official MK-1653-50 specification
*/
case 6: /*** Third Low ***/
{
@ -166,18 +155,26 @@ INLINE unsigned char gamepad_read(int port)
break;
}
default: /*** D3-D0 forced to '1' ***/
case 8: /*** Fourth Low ***/
{
if (data & 0x40)
/* TH = 0 : ?0SA1111 D3-D0 forced to '1' */
data &= ~((pad >> 2) & 0x30);
break;
}
default: /*** 3-button mode ***/
{
if (step & 1)
{
/* TH = 1 : ?0CB1111 */
data &= ~(pad & 0x30);
/* TH = 1 : ?1CBRLDU */
data &= ~(pad & 0x3F);
}
else
{
/* TH = 0 : ?0SA1111 */
data &= ~((pad >> 2) & 0x30);
/* TH = 0 : ?0SA00DU */
data &= ~((pad & 0x03) | ((pad >> 2) & 0x30) | 0x0C);
}
break;
}
}
@ -196,7 +193,7 @@ INLINE void gamepad_write(int port, unsigned char data, unsigned char mask)
gamepad[port].Latency = 0;
/* 6-Buttons controller specific */
if (input.dev[port] == DEVICE_PAD6B)
if ((input.dev[port] == DEVICE_PAD6B) && (gamepad[port].Counter < 10))
{
/* TH 1->0 transition */
if (!data && gamepad[port].State)

2
core/input_hw/gamepad.h
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@ -3,7 +3,7 @@
* 2-Buttons, 3-Buttons & 6-Buttons controller support
* with support for J-Cart, 4-Way Play & Master Tap adapters
*
* Copyright (C) 2007-2016 Eke-Eke (Genesis Plus GX)
* Copyright (C) 2007-2018 Eke-Eke (Genesis Plus GX)
*
* Redistribution and use of this code or any derivative works are permitted
* provided that the following conditions are met: