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implemented SDL2 gamecontroller for dreamcast
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@GPF
GPF committed Jan 17, 2025
1 parent 7e6c8b4 commit 9003ceb
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Showing 2 changed files with 58 additions and 35 deletions.
3 changes: 3 additions & 0 deletions src/joystick/SDL_gamecontrollerdb.h
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Original file line number Diff line number Diff line change
Expand Up @@ -996,6 +996,9 @@ static const char *s_ControllerMappings[] = {
#endif
#ifdef SDL_JOYSTICK_N3DS
"000000004e696e74656e646f20334400,Nintendo 3DS,crc:3210,a:b0,b:b1,back:b2,dpdown:b7,dpleft:b5,dpright:b4,dpup:b6,leftshoulder:b9,lefttrigger:b14,leftx:a0,lefty:a1,rightshoulder:b8,righttrigger:b15,rightx:a2,righty:a3,start:b3,x:b10,y:b11,",
#endif
#ifdef SDL_JOYSTICK_DREAMCAST
"ff0013db5669727475616c2043007601,Dreamcast Controller,platform:Dreamcast,a:b2,b:b1,x:b6,y:b5,start:b3,dpup:h0.1,dpleft:h0.8,dpdown:h0.4,dpright:h0.2,dpup2:h1.1,dpleft2:h1.8,dpdown2:h1.4,dpright2:h1.2,righttrigger:a2~,lefttrigger:a3~,leftx:a0,lefty:a1,rightx:a4,righty:a5,",
#endif
"hidapi,*,a:b0,b:b1,back:b4,dpdown:b12,dpleft:b13,dpright:b14,dpup:b11,guide:b5,leftshoulder:b9,leftstick:b7,lefttrigger:a4,leftx:a0,lefty:a1,rightshoulder:b10,rightstick:b8,righttrigger:a5,rightx:a2,righty:a3,start:b6,x:b2,y:b3,",
NULL
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90 changes: 55 additions & 35 deletions src/joystick/dreamcast/SDL_sysjoystick.c
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Original file line number Diff line number Diff line change
Expand Up @@ -127,9 +127,8 @@ static void DREAMCAST_JoystickSetDevicePlayerIndex(int device_index, int player_

static SDL_JoystickGUID DREAMCAST_JoystickGetDeviceGUID(int device_index)
{
SDL_JoystickGUID guid;
SDL_zero(guid);
return guid;
const char *guid_string = "ff0013db5669727475616c2043007601"; // Your Dreamcast GUID
return SDL_JoystickGetGUIDFromString(guid_string);
}

static SDL_JoystickID DREAMCAST_JoystickGetDeviceInstanceID(int device_index)
Expand Down Expand Up @@ -204,60 +203,81 @@ static void DREAMCAST_JoystickUpdate(SDL_Joystick *joystick)
prev_state = &joystick->hwdata->prev_state;
changed = buttons ^ prev_state->buttons;

if (changed & (CONT_DPAD_UP | CONT_DPAD_DOWN | CONT_DPAD_LEFT |
CONT_DPAD_RIGHT)) {
// Process D-Pad
if (changed & (CONT_DPAD_UP | CONT_DPAD_DOWN | CONT_DPAD_LEFT | CONT_DPAD_RIGHT)) {
hat = SDL_HAT_CENTERED;

if (buttons & CONT_DPAD_UP)
hat |= SDL_HAT_UP;
if (buttons & CONT_DPAD_DOWN)
hat |= SDL_HAT_DOWN;
if (buttons & CONT_DPAD_LEFT)
hat |= SDL_HAT_LEFT;
if (buttons & CONT_DPAD_RIGHT)
hat |= SDL_HAT_RIGHT;

if (buttons & CONT_DPAD_UP) hat |= SDL_HAT_UP;
if (buttons & CONT_DPAD_DOWN) hat |= SDL_HAT_DOWN;
if (buttons & CONT_DPAD_LEFT) hat |= SDL_HAT_LEFT;
if (buttons & CONT_DPAD_RIGHT) hat |= SDL_HAT_RIGHT;
SDL_PrivateJoystickHat(joystick, 0, hat);
}

if (changed & (CONT_DPAD2_UP | CONT_DPAD2_DOWN | CONT_DPAD2_LEFT |
CONT_DPAD2_RIGHT)) {
if (changed & (CONT_DPAD2_UP | CONT_DPAD2_DOWN | CONT_DPAD2_LEFT | CONT_DPAD2_RIGHT)) {
hat = SDL_HAT_CENTERED;

if (buttons & CONT_DPAD2_UP)
hat |= SDL_HAT_UP;
if (buttons & CONT_DPAD2_DOWN)
hat |= SDL_HAT_DOWN;
if (buttons & CONT_DPAD2_LEFT)
hat |= SDL_HAT_LEFT;
if (buttons & CONT_DPAD2_RIGHT)
hat |= SDL_HAT_RIGHT;

if (buttons & CONT_DPAD2_UP) hat |= SDL_HAT_UP;
if (buttons & CONT_DPAD2_DOWN) hat |= SDL_HAT_DOWN;
if (buttons & CONT_DPAD2_LEFT) hat |= SDL_HAT_LEFT;
if (buttons & CONT_DPAD2_RIGHT) hat |= SDL_HAT_RIGHT;
SDL_PrivateJoystickHat(joystick, 1, hat);
}

// Process buttons
for (i = 0; i < MAX_BUTTONS; ++i) {
if (changed & sdl_buttons[i]) {
SDL_PrivateJoystickButton(joystick, i, (buttons & sdl_buttons[i]) ? SDL_PRESSED : SDL_RELEASED);
}
}

// Scale Joystick Axes
#define DC_JOYSTICK_MAX 128
#define SDL_JOYSTICK_MAX 32767
int scale_axis(int value) {
return (value * SDL_JOYSTICK_MAX) / DC_JOYSTICK_MAX;
}

if (state->joyx != prev_state->joyx)
SDL_PrivateJoystickAxis(joystick, 0, state->joyx);
SDL_PrivateJoystickAxis(joystick, 0, scale_axis(state->joyx));
if (state->joyy != prev_state->joyy)
SDL_PrivateJoystickAxis(joystick, 1, state->joyy);
if (state->rtrig != prev_state->rtrig)
SDL_PrivateJoystickAxis(joystick, 2, state->rtrig);
if (state->ltrig != prev_state->ltrig)
SDL_PrivateJoystickAxis(joystick, 3, state->ltrig);
SDL_PrivateJoystickAxis(joystick, 1, scale_axis(state->joyy));
if (state->joy2x != prev_state->joy2x)
SDL_PrivateJoystickAxis(joystick, 4, state->joy2x);
SDL_PrivateJoystickAxis(joystick, 4, scale_axis(state->joy2x));
if (state->joy2y != prev_state->joy2y)
SDL_PrivateJoystickAxis(joystick, 5, state->joy2y);
SDL_PrivateJoystickAxis(joystick, 5, scale_axis(state->joy2y));

// Debugging: Print raw trigger values (before normalization)
// printf("Raw rtrig: %d, ltrig: %d\n", state->rtrig, state->ltrig); // Debugging output

#define DC_TRIGGER_MIN 0
#define DC_TRIGGER_MAX 255
#define SDL_TRIGGER_MAX 32767

int normalize_trigger(int value) {
int normalized = SDL_TRIGGER_MAX;
return (value == DC_TRIGGER_MAX) ? DC_TRIGGER_MIN : normalized; // Ensure we never go negative
}

int rtrig = normalize_trigger(state->rtrig);
int ltrig = normalize_trigger(state->ltrig);

// Debugging: Print normalized trigger values
// printf("Normalized rtrig: %d, ltrig: %d\n", rtrig, ltrig); // Debugging output

// If the trigger state is different, send the updated axis value
if (rtrig != prev_state->rtrig) {
// printf("Updating right trigger: %d\n", rtrig); // Debugging output
SDL_PrivateJoystickAxis(joystick, 2, rtrig); // Right trigger mapped as axis 2
}
if (ltrig != prev_state->ltrig) {
// printf("Updating left trigger: %d\n", ltrig); // Debugging output
SDL_PrivateJoystickAxis(joystick, 3, ltrig); // Left trigger mapped as axis 3
}

// Save the current state to compare on the next frame
joystick->hwdata->prev_state = *state;
}


static void DREAMCAST_JoystickClose(SDL_Joystick *joystick)
{
if (joystick->hwdata != NULL) {
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