Added wacca stub code

mercuryhook/io4.c

@@ -0,0 +1,64 @@
+#include <windows.h>
+
+#include <assert.h>
+#include <stdlib.h>
+#include <string.h>
+
+#include "board/io4.h"
+
+#include "mercuryhook/mercury-dll.h"
+
+#include "util/dprintf.h"
+
+static HRESULT mercury_io4_poll(void *ctx, struct io4_state *state);
+
+static const struct io4_ops mercury_io4_ops = {
+    .poll = mercury_io4_poll,
+};
+
+HRESULT mercury_io4_hook_init(const struct io4_config *cfg)
+{
+    HRESULT hr;
+
+    assert(mercury_dll.init != NULL);
+
+    hr = io4_hook_init(cfg, &mercury_io4_ops, NULL);
+
+    if (FAILED(hr)) {
+        return hr;
+    }
+
+    return mercury_dll.init();
+}
+
+static HRESULT mercury_io4_poll(void *ctx, struct io4_state *state)
+{
+    uint8_t opbtn;
+    HRESULT hr;
+
+    assert(mercury_dll.poll != NULL);
+    assert(mercury_dll.get_opbtns != NULL);
+    assert(mercury_dll.get_gamebtns != NULL);
+
+    memset(state, 0, sizeof(*state));
+
+    hr = mercury_dll.poll();
+
+    if (FAILED(hr)) {
+        return hr;
+    }
+
+    opbtn = 0;
+
+    mercury_dll.get_opbtns(&opbtn);
+
+    if (opbtn & MAI2_IO_OPBTN_TEST) {
+        state->buttons[0] |= IO4_BUTTON_TEST;
+    }
+
+    if (opbtn & MAI2_IO_OPBTN_SERVICE) {
+        state->buttons[0] |= IO4_BUTTON_SERVICE;
+    }
+
+    return S_OK;
+}