idzio: Prepare for switchable backends

idzio/dllmain.c

@@ -0,0 +1,77 @@
+#include <windows.h>
+
+#include <assert.h>
+#include <stdbool.h>
+#include <stdint.h>
+
+#include "idzio/backend.h"
+#include "idzio/idzio.h"
+#include "idzio/xi.h"
+
+static const struct idz_io_backend *idz_io_backend;
+static bool idz_io_coin;
+static uint16_t idz_io_coins;
+
+HRESULT idz_io_init(void)
+{
+    assert(idz_io_backend == NULL);
+
+    return idz_xi_init(&idz_io_backend);
+}
+
+void idz_io_jvs_read_buttons(uint8_t *opbtn_out, uint8_t *gamebtn_out)
+{
+    uint8_t opbtn;
+
+    assert(idz_io_backend != NULL);
+    assert(opbtn_out != NULL);
+    assert(gamebtn_out != NULL);
+
+    opbtn = 0;
+
+    if (GetAsyncKeyState('1')) {
+        opbtn |= IDZ_IO_OPBTN_TEST;
+    }
+
+    if (GetAsyncKeyState('2')) {
+        opbtn |= IDZ_IO_OPBTN_SERVICE;
+    }
+
+    *opbtn_out = opbtn;
+
+    idz_io_backend->jvs_read_buttons(gamebtn_out);
+}
+
+void idz_io_jvs_read_shifter(uint8_t *gear)
+{
+    assert(gear != NULL);
+    assert(idz_io_backend != NULL);
+
+    idz_io_backend->jvs_read_shifter(gear);
+}
+
+void idz_io_jvs_read_analogs(struct idz_io_analog_state *state)
+{
+    assert(state != NULL);
+    assert(idz_io_backend != NULL);
+
+    idz_io_backend->jvs_read_analogs(state);
+}
+
+void idz_io_jvs_read_coin_counter(uint16_t *out)
+{
+    assert(out != NULL);
+
+    /* Coin counter is not backend-specific */
+
+    if (GetAsyncKeyState('3')) {
+        if (!idz_io_coin) {
+            idz_io_coin = true;
+            idz_io_coins++;
+        }
+    } else {
+        idz_io_coin = false;
+    }
+
+    *out = idz_io_coins;
+}