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Add a core option for opposite directions #85

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Merged
LibretroAdmin merged 1 commit into from
Jun 14, 2026
Merged

Add a core option for opposite directions #85

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29 changes: 29 additions & 0 deletions libretro.cpp
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Original file line number Diff line number Diff line change
Expand Up @@ -80,11 +80,23 @@ static const uint32 AnaglyphPreset_Colors[][2] =
};

#define STICK_DEADZONE 0x4000
#define LEFT_DPAD_LEFT 0x0080
#define LEFT_DPAD_RIGHT 0x0040
#define LEFT_DPAD_UP 0x0200
#define LEFT_DPAD_DOWN 0x0100
#define RIGHT_DPAD_LEFT 0x1000
#define RIGHT_DPAD_RIGHT 0x0020
#define RIGHT_DPAD_UP 0x0010
#define RIGHT_DPAD_DOWN 0x2000

// D-Pads opposite directions
#define LEFT_DPAD_LEFT_RIGHT (LEFT_DPAD_LEFT | LEFT_DPAD_RIGHT)
#define LEFT_DPAD_UP_DOWN (LEFT_DPAD_UP | LEFT_DPAD_DOWN)
#define RIGHT_DPAD_LEFT_RIGHT (RIGHT_DPAD_LEFT | RIGHT_DPAD_RIGHT)
#define RIGHT_DPAD_UP_DOWN (RIGHT_DPAD_UP | RIGHT_DPAD_DOWN)

static bool opposite_directions = false;

static uint32 VB3DMode;

static Blip_Buffer sbuf[2];
Expand Down Expand Up @@ -2213,6 +2225,11 @@ static void check_variables(void)
setting_vb_right_analog_to_digital = false;
}

var.key = "vb_opposite_directions";

if (environ_cb(RETRO_ENVIRONMENT_GET_VARIABLE, &var) && var.value)
opposite_directions = !strcmp(var.value, "enabled");

var.key = "vb_cpu_emulation";

if (environ_cb(RETRO_ENVIRONMENT_GET_VARIABLE, &var) && var.value)
Expand Down Expand Up @@ -2409,6 +2426,18 @@ static void update_input(void)
input_buf[j] |= (analog_y < 0) ^ !setting_vb_right_invert_y ? RIGHT_DPAD_DOWN : RIGHT_DPAD_UP;
}

if (!opposite_directions)
{
if ((input_buf[j] & LEFT_DPAD_LEFT_RIGHT) == LEFT_DPAD_LEFT_RIGHT)
input_buf[j] &= ~LEFT_DPAD_LEFT_RIGHT;
if ((input_buf[j] & LEFT_DPAD_UP_DOWN) == LEFT_DPAD_UP_DOWN)
input_buf[j] &= ~LEFT_DPAD_UP_DOWN;
if ((input_buf[j] & RIGHT_DPAD_LEFT_RIGHT) == RIGHT_DPAD_LEFT_RIGHT)
input_buf[j] &= ~RIGHT_DPAD_LEFT_RIGHT;
if ((input_buf[j] & RIGHT_DPAD_UP_DOWN) == RIGHT_DPAD_UP_DOWN)
input_buf[j] &= ~RIGHT_DPAD_UP_DOWN;
}

#ifdef MSB_FIRST
union {
uint8_t b[2];
Expand Down
11 changes: 11 additions & 0 deletions libretro_core_options.h
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Original file line number Diff line number Diff line change
Expand Up @@ -183,6 +183,17 @@ struct retro_core_option_definition option_defs_us[] = {
},
"disabled",
},
{
"vb_opposite_directions",
"Allow Opposite Directions",
"Allow pressing up and down or left and right directions at the same time. This may cause glitches.",
{
{ "disabled", NULL },
{ "enabled", NULL },
{ NULL, NULL },
},
"disabled",
},
{
"vb_cpu_emulation",
"CPU emulation (Restart)",
Expand Down