segatools/carolhook/touch.c

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C
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2022-12-11 03:01:52 +00:00
#include <windows.h>
#include <assert.h>
#include <stdbool.h>
#include <stdint.h>
#include <string.h>
#include "carolhook/carol-dll.h"
#include "carolhook/touch.h"
#include "hooklib/uart.h"
#include "util/dprintf.h"
#include "util/dump.h"
static HRESULT touch_handle_irp(struct irp *irp);
static HRESULT touch_handle_irp_locked(struct irp *irp);
static HRESULT touch_frame_decode(struct touch_req *dest, struct iobuf *iobuf);
static CRITICAL_SECTION touch_lock;
static struct uart touch_uart;
static uint8_t touch_written_bytes[520];
static uint8_t touch_readable_bytes[520];
HRESULT touch_hook_init(const struct touch_config *cfg)
{
if (!cfg->enable) {
return S_OK;
}
InitializeCriticalSection(&touch_lock);
uart_init(&touch_uart, 1);
touch_uart.written.bytes = touch_written_bytes;
touch_uart.written.nbytes = sizeof(touch_written_bytes);
touch_uart.readable.bytes = touch_readable_bytes;
touch_uart.readable.nbytes = sizeof(touch_readable_bytes);
dprintf("Touchscreen: Init\n");
return iohook_push_handler(touch_handle_irp);
return S_OK;
}
static HRESULT touch_handle_irp(struct irp *irp)
{
HRESULT hr;
assert(irp != NULL);
if (!uart_match_irp(&touch_uart, irp)) {
return iohook_invoke_next(irp);
}
EnterCriticalSection(&touch_lock);
hr = touch_handle_irp_locked(irp);
LeaveCriticalSection(&touch_lock);
return hr;
}
static HRESULT touch_handle_irp_locked(struct irp *irp)
{
struct touch_req req;
HRESULT hr;
assert(carol_dll.touch_init != NULL);
if (irp->op == IRP_OP_OPEN) {
dprintf("Touchscreen: Starting backend DLL\n");
hr = carol_dll.touch_init();
if (FAILED(hr)) {
dprintf("Touchscreen: Backend DLL error: %x\n", (int) hr);
return hr;
}
}
hr = uart_handle_irp(&touch_uart, irp);
if (FAILED(hr) || irp->op != IRP_OP_WRITE) {
return hr;
}
for (;;) {
#if 1
dprintf("Touchscreen: TX Buffer:\n");
dump_iobuf(&touch_uart.written);
#endif
hr = touch_frame_decode(&req, &touch_uart.written);
if (FAILED(hr)) {
dprintf("Touchscreen: Deframe Error: %x\n", (int) hr);
return hr;
}
return hr;
}
}
/* Decodes the response into a struct that's easier to work with. */
static HRESULT touch_frame_decode(struct touch_req *dest, struct iobuf *iobuf)
{
dest->cmd = iobuf->bytes[0];
iobuf->pos--;
dest->data_length = iobuf->pos;
if (dest->data_length > 0) {
for (int i = 1; i < dest->data_length; i++) {
dest->data[i-1] = iobuf->bytes[i];
}
}
iobuf->pos -= dest->data_length;
return S_OK;
}