static void js_callback(EV_P_ ev_io* w, int revents) { // read whatever's available for us struct js_event e; int result = read(jsfd, &e, sizeof(struct js_event)); // handle the event - either using keys to call out to scheme procedures or updating our axes if (e.type == JS_EVENT_BUTTON) { handle_and_dispatch_button(e); } else if (e.type == JS_EVENT_AXIS) { handle_axis_event(e); } }
/* update_joystick: [joystick thread] * Reads in data for a single DirectInput joystick device, updates * the internal ALLEGRO_JOYSTICK_STATE structure, and generates any Allegro * events required. */ static void update_joystick(ALLEGRO_JOYSTICK_DIRECTX *joy) { DIDEVICEOBJECTDATA buffer[DEVICE_BUFFER_SIZE]; DWORD num_items = DEVICE_BUFFER_SIZE; HRESULT hr; ALLEGRO_EVENT_SOURCE *es = al_get_joystick_event_source(); /* some devices require polling */ IDirectInputDevice8_Poll(joy->device); /* get device data into buffer */ hr = IDirectInputDevice8_GetDeviceData(joy->device, sizeof(DIDEVICEOBJECTDATA), buffer, &num_items, 0); if (hr != DI_OK && hr != DI_BUFFEROVERFLOW) { if ((hr == DIERR_NOTACQUIRED) || (hr == DIERR_INPUTLOST)) { ALLEGRO_WARN("joystick device not acquired or lost\n"); } else { ALLEGRO_ERROR("unexpected error while polling the joystick\n"); } return; } /* don't bother locking the event source if there's no work to do */ /* this happens a lot for polled devices */ if (num_items == 0) return; _al_event_source_lock(es); { unsigned int i; for (i = 0; i < num_items; i++) { const DIDEVICEOBJECTDATA *item = &buffer[i]; const int dwOfs = item->dwOfs; const DWORD dwData = item->dwData; switch (dwOfs) { case DIJOFS_X: handle_axis_event(joy, &joy->x_mapping, dwData); break; case DIJOFS_Y: handle_axis_event(joy, &joy->y_mapping, dwData); break; case DIJOFS_Z: handle_axis_event(joy, &joy->z_mapping, dwData); break; case DIJOFS_RX: handle_axis_event(joy, &joy->rx_mapping, dwData); break; case DIJOFS_RY: handle_axis_event(joy, &joy->ry_mapping, dwData); break; case DIJOFS_RZ: handle_axis_event(joy, &joy->rz_mapping, dwData); break; case DIJOFS_SLIDER(0): handle_axis_event(joy, &joy->slider_mapping[0], dwData); break; case DIJOFS_SLIDER(1): handle_axis_event(joy, &joy->slider_mapping[1], dwData); break; case DIJOFS_POV(0): handle_pov_event(joy, joy->pov_mapping_stick[0], dwData); break; case DIJOFS_POV(1): handle_pov_event(joy, joy->pov_mapping_stick[1], dwData); break; case DIJOFS_POV(2): handle_pov_event(joy, joy->pov_mapping_stick[2], dwData); break; case DIJOFS_POV(3): handle_pov_event(joy, joy->pov_mapping_stick[3], dwData); break; default: /* buttons */ if ((dwOfs >= DIJOFS_BUTTON0) && (dwOfs < DIJOFS_BUTTON(joy->parent.info.num_buttons))) { int num = (dwOfs - DIJOFS_BUTTON0) / (DIJOFS_BUTTON1 - DIJOFS_BUTTON0); handle_button_event(joy, num, (dwData & 0x80)); } break; } } } _al_event_source_unlock(es); }