spicetools/games/shared/twtouch.cpp

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2024-08-28 15:10:34 +00:00
#include "twtouch.h"
#include "util/utils.h"
namespace games::shared {
#pragma pack(push, 1)
struct TwTouchEventReport {
uint32_t type;
uint8_t padding1[8];
uint32_t status;
uint16_t x;
uint16_t y;
uint8_t padding2[4];
};
static_assert(sizeof(TwTouchEventReport) == 0x18);
#pragma pack(pop)
bool TwTouchDevice::open(LPCWSTR lpFileName) {
return wcscmp(lpFileName, L"\\\\.\\TwTouchDriver") == 0;
}
int TwTouchDevice::read(LPVOID lpBuffer, DWORD nNumberOfBytesToRead) {
// ignore if buffer is too small
if (nNumberOfBytesToRead < sizeof(TwTouchEventReport)) {
return 0;
}
// get touch events once our buffer is empty
if (this->report_buffer.empty()) {
touch_get_events(this->report_buffer);
}
// check if an event is available
if (this->report_buffer.empty()) {
/*
* We limit the number of continuous reads the device can do
* since games may try to read all at once into a buffer.
* QMA has a limit of 100 events going in at once.
* To avoid this we have to return nothing at least once every 100 read calls.
*/
if (this->continuous_reads >= 99) {
// reset counter
this->continuous_reads = 0;
} else {
// get touch points
touch_get_points(this->touch_points);
// insert fake events
for (auto &touch_point : this->touch_points) {
this->report_buffer.push_back(TouchEvent {
.id = touch_point.id,
.x = touch_point.x,
.y = touch_point.y,
.type = TOUCH_MOVE,
.mouse = false,
});
}
// clear touch points
this->touch_points.clear();
}
} else {
// increase counter
this->continuous_reads++;
// pick the first event
auto &touch_event = this->report_buffer[0];
// build report
TwTouchEventReport report {};
/*
* Known report types
*
* ID Size Desc
* 0x01 20
* 0x02 16
* 0x03 20 QMA checks uint32_t at offset 12 and uint16_t at offset 16
* 0x04 16
* 0x05 24 Touch Event
* 0x06 24
* 0x08 24
* 0x09 24 SCV has an alternate Touch Event path here
* 0x0B 32
* 0x0C 16
* 0x0D 36
* 0x0E 16
*/
report.type = 0x05;
// set report data
switch (touch_event.type) {
case TOUCH_DOWN:
case TOUCH_MOVE:
// if the status is 1 it means it's pressed
report.status = 1;
report.x = CLAMP(this->offset_x + touch_event.x * this->scale_x, 0, 65535);
report.y = CLAMP(this->offset_y + touch_event.y * this->scale_y, 0, 65535);
// flip coordinates
if (this->flip_x) {
report.x = 0xFFFF - report.x;
}
if (this->flip_y) {
report.y = 0xFFFF - report.y;
}
break;
case TOUCH_UP:
// status 3 (and 12?) is a touch up event
report.status = 3;
report.x = 0;
report.y = 0;
break;
}
// erase touch event
this->report_buffer.erase(this->report_buffer.begin());
// copy report to buffer
memcpy(lpBuffer, &report, sizeof(report));
return sizeof(report);
}
// no touch event available for read
return 0;
}
int TwTouchDevice::write(LPCVOID, DWORD) {
return 0;
}
int TwTouchDevice::device_io(DWORD, LPVOID, DWORD, LPVOID, DWORD) {
return 0;
}
bool TwTouchDevice::close() {
return true;
}
}