Window: add function to get the current mouse button state

1 files changed, 27 insertions, 0 deletions

diff --git a/src/window/window.c b/src/window/window.c
index 4523471..5cc7ba1 100644
--- a/src/window/window.c
+++ b/src/window/window.c
@@ -62,6 +62,7 @@ typedef struct {
     */
     x11_events_circular_buffer events;
     bool key_pressed[__MGL_NUM_KEYS__];
+    bool mouse_button_pressed[__MGL_NUM_MOUSE_BUTTONS__];
 } x11_context;
 
 static void x11_context_deinit(x11_context *self);
@@ -100,6 +101,10 @@ static int x11_context_init(x11_context *self) {
         self->key_pressed[i] = false;
     }
 
+    for(size_t i = 0; i < __MGL_NUM_MOUSE_BUTTONS__; ++i) {
+        self->mouse_button_pressed[i] = false;
+    }
+
     return 0;
 }
 
@@ -150,10 +155,24 @@ static bool x11_context_update_key_state(x11_context *self, mgl_key key, bool ke
     }
 }
 
+/* Returns true if the state changed */
+static bool x11_context_update_mouse_button_state(x11_context *self, mgl_mouse_button button, bool button_pressed) {
+    if(self->mouse_button_pressed[button] != button_pressed) {
+        self->mouse_button_pressed[button] = button_pressed;
+        return true;
+    } else {
+        return false;
+    }
+}
+
 static bool x11_context_is_key_pressed(const x11_context *self, mgl_key key) {
     return self->key_pressed[key];
 }
 
+static bool x11_context_is_mouse_button_pressed(const x11_context *self, mgl_mouse_button button) {
+    return self->mouse_button_pressed[button];
+}
+
 /* TODO: Use gl OML present for other platforms than nvidia? nvidia doesn't support present yet */
 
 /* TODO: check for glx swap control extension string (GLX_EXT_swap_control, etc) */
@@ -487,6 +506,7 @@ static void mgl_window_on_receive_event(mgl_window *self, XEvent *xev, mgl_event
                 event->mouse_button.button = x11_button_to_mgl_button(xev->xbutton.button);
                 event->mouse_button.x = xev->xbutton.x;
                 event->mouse_button.y = xev->xbutton.y;
+                x11_context_update_mouse_button_state(self->context, event->mouse_button.button, true);
             }
             return;
         }
@@ -495,6 +515,7 @@ static void mgl_window_on_receive_event(mgl_window *self, XEvent *xev, mgl_event
             event->mouse_button.button = x11_button_to_mgl_button(xev->xbutton.button);
             event->mouse_button.x = xev->xbutton.x;
             event->mouse_button.y = xev->xbutton.y;
+            x11_context_update_mouse_button_state(self->context, event->mouse_button.button, false);
             return;
         }
         case FocusIn: {
@@ -613,6 +634,12 @@ bool mgl_window_is_key_pressed(const mgl_window *self, mgl_key key) {
     return x11_context_is_key_pressed(self->context, key);
 }
 
+bool mgl_window_is_mouse_button_pressed(const mgl_window *self, mgl_mouse_button button) {
+    if(button < 0 || button >= __MGL_NUM_MOUSE_BUTTONS__)
+        return false;
+    return x11_context_is_mouse_button_pressed(self->context, button);
+}
+
 void mgl_window_close(mgl_window *self) {
     mgl_context *context = mgl_get_context();
     XUnmapWindow(context->connection, self->window);