Add basic mouse support to X11 input.

input/x11_input.c

@@ -206,6 +206,46 @@ static int16_t x_analog_state(x11_input_t *x11, const struct retro_keybind **bin
    return res_plus + res_minus;
 }
 
+static int16_t x_mouse_state(x11_input_t *x11, unsigned id)
+{
+   switch (id)
+   {
+      case RETRO_DEVICE_ID_MOUSE_X:
+         return x11->mouse_x - x11->mouse_last_x;
+      case RETRO_DEVICE_ID_MOUSE_Y:
+         return x11->mouse_y - x11->mouse_last_y;
+      case RETRO_DEVICE_ID_MOUSE_LEFT:
+         return x11->mouse_l;
+      case RETRO_DEVICE_ID_MOUSE_RIGHT:
+         return x11->mouse_r;
+      default:
+         return 0;
+   }
+}
+
+static int16_t x_lightgun_state(x11_input_t *x11, unsigned id)
+{
+   switch (id)
+   {
+      case RETRO_DEVICE_ID_LIGHTGUN_X:
+         return x11->mouse_x - x11->mouse_last_x;
+      case RETRO_DEVICE_ID_LIGHTGUN_Y:
+         return x11->mouse_y - x11->mouse_last_y;
+      case RETRO_DEVICE_ID_LIGHTGUN_TRIGGER:
+         return x11->mouse_l;
+      case RETRO_DEVICE_ID_LIGHTGUN_CURSOR:
+         return x11->mouse_m;
+      case RETRO_DEVICE_ID_LIGHTGUN_TURBO:
+         return x11->mouse_r;
+      case RETRO_DEVICE_ID_LIGHTGUN_START:
+         return x11->mouse_m && x11->mouse_r; 
+      case RETRO_DEVICE_ID_LIGHTGUN_PAUSE:
+         return x11->mouse_m && x11->mouse_l; 
+      default:
+         return 0;
+   }
+}
+
 static int16_t x_input_state(void *data, const struct retro_keybind **binds, unsigned port, unsigned device, unsigned index, unsigned id)
 {
    x11_input_t *x11 = (x11_input_t*)data;
@@ -227,6 +267,12 @@ static int16_t x_input_state(void *data, const struct retro_keybind **binds, uns
          return ret;
       }
 
+      case RETRO_DEVICE_MOUSE:
+         return x_mouse_state(x11, id);
+
+      case RETRO_DEVICE_LIGHTGUN:
+         return x_lightgun_state(x11, id);
+
       default:
          return 0;
    }
@@ -243,6 +289,32 @@ static void x_input_free(void *data)
    free(data);
 }
 
+static void x_input_poll_mouse(x11_input_t *x11)
+{
+   if (!x11->inherit_disp)
+      return;
+
+   Window root_win, child_win;
+   int root_x, root_y, win_x, win_y;
+   unsigned mask;
+
+   x11->mouse_last_x = x11->mouse_x;
+   x11->mouse_last_y = x11->mouse_y;
+
+   XQueryPointer(x11->display,
+            x11->win,
+            &root_win, &child_win,
+            &root_x, &root_y,
+            &win_x, &win_y,
+            &mask);
+
+   x11->mouse_x = root_x;
+   x11->mouse_y = root_y;
+   x11->mouse_l = mask & Button1Mask; 
+   x11->mouse_m = mask & Button2Mask; 
+   x11->mouse_r = mask & Button3Mask; 
+}
+
 static void x_input_poll(void *data)
 {
    x11_input_t *x11 = (x11_input_t*)data;
@@ -256,6 +328,7 @@ static void x_input_poll(void *data)
    else
       memset(x11->state, 0, sizeof(x11->state));
 
+   x_input_poll_mouse(x11);
    input_sdl.poll(x11->sdl);
 }
 

input/x11_input.h

@@ -38,6 +38,9 @@ typedef struct x11_input
    Window win;
 
    char state[32];
+   bool mouse_l, mouse_r, mouse_m;
+   int mouse_x, mouse_y;
+   int mouse_last_x, mouse_last_y;
 } x11_input_t;
 
 void x_input_set_disp_win(x11_input_t *x11, Display *dpy, Window win);

libretro-test/libretro-test.c

@@ -122,6 +122,19 @@ static void update_input(void)
    if (input_state_cb(0, RETRO_DEVICE_KEYBOARD, 0, RETROK_x))
       fprintf(stderr, "x key is pressed!\n");
 
+   int16_t mouse_x = input_state_cb(0, RETRO_DEVICE_MOUSE, 0, RETRO_DEVICE_ID_MOUSE_X);
+   int16_t mouse_y = input_state_cb(0, RETRO_DEVICE_MOUSE, 0, RETRO_DEVICE_ID_MOUSE_Y);
+   bool mouse_l    = input_state_cb(0, RETRO_DEVICE_MOUSE, 0, RETRO_DEVICE_ID_MOUSE_LEFT);
+   bool mouse_r    = input_state_cb(0, RETRO_DEVICE_MOUSE, 0, RETRO_DEVICE_ID_MOUSE_RIGHT);
+   if (mouse_x)
+      fprintf(stderr, "Mouse X: %d\n", mouse_x);
+   if (mouse_y)
+      fprintf(stderr, "Mouse Y: %d\n", mouse_y);
+   if (mouse_l)
+      fprintf(stderr, "Mouse L pressed.\n");
+   if (mouse_r)
+      fprintf(stderr, "Mouse R pressed.\n");
+
    dir_x += input_state_cb(0, RETRO_DEVICE_ANALOG, RETRO_DEVICE_INDEX_ANALOG_LEFT, RETRO_DEVICE_ID_ANALOG_X) / 2000;
    dir_y += input_state_cb(0, RETRO_DEVICE_ANALOG, RETRO_DEVICE_INDEX_ANALOG_LEFT, RETRO_DEVICE_ID_ANALOG_Y) / 2000;
    //dir_x += input_state_cb(0, RETRO_DEVICE_ANALOG, RETRO_DEVICE_INDEX_ANALOG_RIGHT, RETRO_DEVICE_ID_ANALOG_X) / 2000;