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Added game controller support for virtual joysticks 

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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97
src/joystick/SDL_gamecontroller.c
View File

@ -464,6 +464,100 @@ static int SDLCALL SDL_GameControllerEventWatcher(void *userdata, SDL_Event * ev
return 1;
}
/*
* Helper function to guess at a mapping for virtual controllers
*/
static ControllerMapping_t *SDL_CreateMappingForVirtualController(SDL_JoystickGUID guid)
{
const int face_button_mask = ((1 << SDL_CONTROLLER_BUTTON_A) |
(1 << SDL_CONTROLLER_BUTTON_B) |
(1 << SDL_CONTROLLER_BUTTON_X) |
(1 << SDL_CONTROLLER_BUTTON_Y));
SDL_bool existing;
char mapping_string[1024];
int button_mask;
int axis_mask;
button_mask = SDL_SwapLE16(*(Uint16*)(&guid.data[sizeof(guid.data)-4]));
axis_mask = SDL_SwapLE16(*(Uint16*)(&guid.data[sizeof(guid.data)-2]));
if (!button_mask && !axis_mask) {
return NULL;
}
if (!(button_mask & face_button_mask)) {
/* We don't know what buttons or axes are supported, don't make up a mapping */
return NULL;
}
SDL_strlcpy(mapping_string, "none,*,", sizeof(mapping_string));
if (button_mask & (1 << SDL_CONTROLLER_BUTTON_A)) {
SDL_strlcat(mapping_string, "a:b0,", sizeof(mapping_string));
}
if (button_mask & (1 << SDL_CONTROLLER_BUTTON_B)) {
SDL_strlcat(mapping_string, "b:b1,", sizeof(mapping_string));
}
if (button_mask & (1 << SDL_CONTROLLER_BUTTON_X)) {
SDL_strlcat(mapping_string, "x:b2,", sizeof(mapping_string));
}
if (button_mask & (1 << SDL_CONTROLLER_BUTTON_Y)) {
SDL_strlcat(mapping_string, "y:b3,", sizeof(mapping_string));
}
if (button_mask & (1 << SDL_CONTROLLER_BUTTON_BACK)) {
SDL_strlcat(mapping_string, "back:b4,", sizeof(mapping_string));
}
if (button_mask & (1 << SDL_CONTROLLER_BUTTON_GUIDE)) {
SDL_strlcat(mapping_string, "guide:b5,", sizeof(mapping_string));
}
if (button_mask & (1 << SDL_CONTROLLER_BUTTON_START)) {
SDL_strlcat(mapping_string, "start:b6,", sizeof(mapping_string));
}
if (button_mask & (1 << SDL_CONTROLLER_BUTTON_LEFTSTICK)) {
SDL_strlcat(mapping_string, "leftstick:b7,", sizeof(mapping_string));
}
if (button_mask & (1 << SDL_CONTROLLER_BUTTON_RIGHTSTICK)) {
SDL_strlcat(mapping_string, "rightstick:b8,", sizeof(mapping_string));
}
if (button_mask & (1 << SDL_CONTROLLER_BUTTON_LEFTSHOULDER)) {
SDL_strlcat(mapping_string, "leftshoulder:b9,", sizeof(mapping_string));
}
if (button_mask & (1 << SDL_CONTROLLER_BUTTON_RIGHTSHOULDER)) {
SDL_strlcat(mapping_string, "rightshoulder:b10,", sizeof(mapping_string));
}
if (button_mask & (1 << SDL_CONTROLLER_BUTTON_DPAD_UP)) {
SDL_strlcat(mapping_string, "dpup:b11,", sizeof(mapping_string));
}
if (button_mask & (1 << SDL_CONTROLLER_BUTTON_DPAD_DOWN)) {
SDL_strlcat(mapping_string, "dpdown:b12,", sizeof(mapping_string));
}
if (button_mask & (1 << SDL_CONTROLLER_BUTTON_DPAD_LEFT)) {
SDL_strlcat(mapping_string, "dpleft:b13,", sizeof(mapping_string));
}
if (button_mask & (1 << SDL_CONTROLLER_BUTTON_DPAD_RIGHT)) {
SDL_strlcat(mapping_string, "dpright:b14,", sizeof(mapping_string));
}
if (axis_mask & (1 << SDL_CONTROLLER_AXIS_LEFTX)) {
SDL_strlcat(mapping_string, "leftx:a0,", sizeof(mapping_string));
}
if (axis_mask & (1 << SDL_CONTROLLER_AXIS_LEFTY)) {
SDL_strlcat(mapping_string, "lefty:a1,", sizeof(mapping_string));
}
if (axis_mask & (1 << SDL_CONTROLLER_AXIS_RIGHTX)) {
SDL_strlcat(mapping_string, "rightx:a2,", sizeof(mapping_string));
}
if (axis_mask & (1 << SDL_CONTROLLER_AXIS_RIGHTY)) {
SDL_strlcat(mapping_string, "righty:a3,", sizeof(mapping_string));
}
if (axis_mask & (1 << SDL_CONTROLLER_AXIS_TRIGGERLEFT)) {
SDL_strlcat(mapping_string, "lefttrigger:a4,", sizeof(mapping_string));
}
if (axis_mask & (1 << SDL_CONTROLLER_AXIS_TRIGGERRIGHT)) {
SDL_strlcat(mapping_string, "righttrigger:a5,", sizeof(mapping_string));
}
return SDL_PrivateAddMappingForGUID(guid, mapping_string,
&existing, SDL_CONTROLLER_MAPPING_PRIORITY_DEFAULT);
}
#ifdef __ANDROID__
/*
* Helper function to guess at a mapping based on the elements reported for this controller
@ -696,6 +790,9 @@ static ControllerMapping_t *SDL_PrivateGetControllerMappingForGUID(SDL_JoystickG
return s_pXInputMapping;
}
#endif
if (!mapping && SDL_IsJoystickVirtual(guid)) {
mapping = SDL_CreateMappingForVirtualController(guid);
}
#ifdef __ANDROID__
if (!mapping && !SDL_IsJoystickHIDAPI(guid)) {
mapping = SDL_CreateMappingForAndroidController(guid);

1
src/joystick/SDL_sysjoystick.h
View File

@ -119,6 +119,7 @@ struct _SDL_Joystick
};
/* Device bus definitions */
#define SDL_HARDWARE_BUS_VIRTUAL 0x00
#define SDL_HARDWARE_BUS_USB 0x03
#define SDL_HARDWARE_BUS_BLUETOOTH 0x05

71
src/joystick/virtual/SDL_virtualjoystick.c
View File

@ -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;