idzio: Prepare for switchable backends

2019-05-04 18:47:34 -04:00
parent 2864d22df2
commit 04189be8f0
5 changed files with 141 additions and 46 deletions
--- a/idzio/xi.c
+++ b/idzio/xi.c
@ -0,0 +1,146 @@
+#include <windows.h>
+#include <xinput.h>
+
+#include <assert.h>
+#include <stdbool.h>
+#include <stdint.h>
+
+#include "idzio/backend.h"
+#include "idzio/idzio.h"
+#include "idzio/xi.h"
+
+#include "util/dprintf.h"
+
+static void idz_xi_jvs_read_buttons(uint8_t *gamebtn_out);
+static void idz_xi_jvs_read_shifter(uint8_t *gear);
+static void idz_xi_jvs_read_analogs(struct idz_io_analog_state *out);
+
+static const struct idz_io_backend idz_xi_backend = {
+    .jvs_read_buttons   = idz_xi_jvs_read_buttons,
+    .jvs_read_shifter   = idz_xi_jvs_read_shifter,
+    .jvs_read_analogs   = idz_xi_jvs_read_analogs,
+};
+
+static bool idz_xi_shifting;
+static uint8_t idz_xi_gear;
+
+HRESULT idz_xi_init(const struct idz_io_backend **backend)
+{
+    assert(backend != NULL);
+
+    dprintf("IDZ XI: Using XInput controller\n");
+    *backend = &idz_xi_backend;
+
+    return S_OK;
+}
+
+static void idz_xi_jvs_read_buttons(uint8_t *gamebtn_out)
+{
+    uint8_t gamebtn;
+    XINPUT_STATE xi;
+    WORD xb;
+
+    assert(gamebtn_out != NULL);
+
+    gamebtn = 0;
+
+    memset(&xi, 0, sizeof(xi));
+    XInputGetState(0, &xi);
+    xb = xi.Gamepad.wButtons;
+
+    if (xb & XINPUT_GAMEPAD_DPAD_UP) {
+        gamebtn |= IDZ_IO_GAMEBTN_UP;
+    }
+
+    if (xb & XINPUT_GAMEPAD_DPAD_DOWN) {
+        gamebtn |= IDZ_IO_GAMEBTN_DOWN;
+    }
+
+    if (xb & XINPUT_GAMEPAD_DPAD_LEFT) {
+        gamebtn |= IDZ_IO_GAMEBTN_LEFT;
+    }
+
+    if (xb & XINPUT_GAMEPAD_DPAD_RIGHT) {
+        gamebtn |= IDZ_IO_GAMEBTN_RIGHT;
+    }
+
+    if (xb & XINPUT_GAMEPAD_START) {
+        gamebtn |= IDZ_IO_GAMEBTN_START;
+    }
+
+    if (xb & XINPUT_GAMEPAD_BACK) {
+        gamebtn |= IDZ_IO_GAMEBTN_VIEW_CHANGE;
+    }
+
+    *gamebtn_out = gamebtn;
+}
+
+static void idz_xi_jvs_read_shifter(uint8_t *gear)
+{
+    bool shift_inc;
+    bool shift_dec;
+    XINPUT_STATE xi;
+    WORD xb;
+
+    assert(gear != NULL);
+
+    memset(&xi, 0, sizeof(xi));
+    XInputGetState(0, &xi);
+    xb = xi.Gamepad.wButtons;
+
+    if (xb & XINPUT_GAMEPAD_START) {
+        idz_xi_gear = 0; /* Reset to Neutral when start is pressed */
+    }
+
+    shift_inc = xb & (XINPUT_GAMEPAD_X | XINPUT_GAMEPAD_RIGHT_SHOULDER);
+    shift_dec = xb & (XINPUT_GAMEPAD_Y | XINPUT_GAMEPAD_LEFT_SHOULDER);
+
+    if (!idz_xi_shifting) {
+        if (shift_inc && idz_xi_gear < 6) {
+            idz_xi_gear++;
+        }
+
+        if (shift_dec && idz_xi_gear > 0) {
+            idz_xi_gear--;
+        }
+    }
+
+    idz_xi_shifting = shift_inc || shift_dec;
+    *gear = idz_xi_gear;
+}
+
+static void idz_xi_jvs_read_analogs(struct idz_io_analog_state *out)
+{
+    XINPUT_STATE xi;
+    int left;
+    int right;
+
+    assert(out != NULL);
+
+    memset(&xi, 0, sizeof(xi));
+    XInputGetState(0, &xi);
+
+    left = xi.Gamepad.sThumbLX;
+
+    if (left < -XINPUT_GAMEPAD_LEFT_THUMB_DEADZONE) {
+        left += XINPUT_GAMEPAD_LEFT_THUMB_DEADZONE;
+    } else if (left > XINPUT_GAMEPAD_LEFT_THUMB_DEADZONE) {
+        left -= XINPUT_GAMEPAD_LEFT_THUMB_DEADZONE;
+    } else {
+        left = 0;
+    }
+
+    right = xi.Gamepad.sThumbRX;
+
+    if (right < -XINPUT_GAMEPAD_RIGHT_THUMB_DEADZONE) {
+        right += XINPUT_GAMEPAD_RIGHT_THUMB_DEADZONE;
+    } else if (right > XINPUT_GAMEPAD_RIGHT_THUMB_DEADZONE) {
+        right -= XINPUT_GAMEPAD_RIGHT_THUMB_DEADZONE;
+    } else {
+        right = 0;
+    }
+
+    out->wheel = (left + right) / 2;
+    out->accel = xi.Gamepad.bRightTrigger << 8;
+    out->brake = xi.Gamepad.bLeftTrigger << 8;
+}