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Added game controller support for virtual joysticks

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Fixes https://github.com/libsdl-org/SDL/issues/5662
This commit is contained in:
Sam Lantinga
2022-05-15 09:35:52 -07:00
parent 996b3dc37a
commit 7ad15c5b8f
3 changed files with 168 additions and 1 deletions
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71
src/joystick/virtual/SDL_virtualjoystick.c
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@@ -24,6 +24,7 @@
/* This is the virtual implementation of the SDL joystick API */
#include "SDL_endian.h"
#include "SDL_virtualjoystick_c.h"
#include "../SDL_sysjoystick.h"
#include "../SDL_joystick_c.h"
@@ -94,6 +95,11 @@ SDL_JoystickAttachVirtualInner(SDL_JoystickType type,
{
joystick_hwdata *hwdata = NULL;
int device_index = -1;
const Uint16 vendor_id = 0;
const Uint16 product_id = 0;
Uint16 button_mask = 0;
Uint16 axis_mask = 0;
Uint16 *guid16;
hwdata = SDL_calloc(1, sizeof(joystick_hwdata));
if (!hwdata) {
@@ -104,7 +110,69 @@ SDL_JoystickAttachVirtualInner(SDL_JoystickType type,
hwdata->naxes = naxes;
hwdata->nbuttons = nbuttons;
hwdata->nhats = nhats;
hwdata->name = "Virtual Joystick";
switch (type) {
case SDL_JOYSTICK_TYPE_GAMECONTROLLER:
hwdata->name = "Virtual Controller";
break;
case SDL_JOYSTICK_TYPE_WHEEL:
hwdata->name = "Virtual Wheel";
break;
case SDL_JOYSTICK_TYPE_ARCADE_STICK:
hwdata->name = "Virtual Arcade Stick";
break;
case SDL_JOYSTICK_TYPE_FLIGHT_STICK:
hwdata->name = "Virtual Flight Stick";
break;
case SDL_JOYSTICK_TYPE_DANCE_PAD:
hwdata->name = "Virtual Dance Pad";
break;
case SDL_JOYSTICK_TYPE_GUITAR:
hwdata->name = "Virtual Guitar";
break;
case SDL_JOYSTICK_TYPE_DRUM_KIT:
hwdata->name = "Virtual Drum Kit";
break;
case SDL_JOYSTICK_TYPE_ARCADE_PAD:
hwdata->name = "Virtual Arcade Pad";
break;
case SDL_JOYSTICK_TYPE_THROTTLE:
hwdata->name = "Virtual Throttle";
break;
default:
hwdata->name = "Virtual Joystick";
break;
}
if (type == SDL_JOYSTICK_TYPE_GAMECONTROLLER) {
int i;
if (naxes >= 2) {
axis_mask |= ((1 << SDL_CONTROLLER_AXIS_LEFTX) | (1 << SDL_CONTROLLER_AXIS_LEFTY));
}
if (naxes >= 4) {
axis_mask |= ((1 << SDL_CONTROLLER_AXIS_RIGHTX) | (1 << SDL_CONTROLLER_AXIS_RIGHTY));
}
if (naxes >= 6) {
axis_mask |= ((1 << SDL_CONTROLLER_AXIS_TRIGGERLEFT) | (1 << SDL_CONTROLLER_AXIS_TRIGGERRIGHT));
}
for (i = 0; i < nbuttons && i < sizeof(Uint16)*8; ++i) {
button_mask |= (1 << i);
}
}
/* We only need 16 bits for each of these; space them out to fill 128. */
/* Byteswap so devices get same GUID on little/big endian platforms. */
guid16 = (Uint16 *)hwdata->guid.data;
*guid16++ = SDL_SwapLE16(SDL_HARDWARE_BUS_VIRTUAL);
*guid16++ = 0;
*guid16++ = SDL_SwapLE16(vendor_id);
*guid16++ = 0;
*guid16++ = SDL_SwapLE16(product_id);
*guid16++ = 0;
*guid16++ = SDL_SwapLE16(button_mask);
*guid16++ = SDL_SwapLE16(axis_mask);
/* Note that this is a Virtual device and what subtype it is */
hwdata->guid.data[14] = 'v';
@@ -326,6 +394,7 @@ VIRTUAL_JoystickOpen(SDL_Joystick *joystick, int device_index)
return SDL_SetError("No such device");
}
if (hwdata->opened) {
/* This should never happen, it's handled by the higher joystick code */
return SDL_SetError("Joystick already opened");
}
joystick->instance_id = hwdata->instance_id;