1 files changed, 21 insertions, 0 deletions
diff --git a/src/common.c b/src/common.c
index 74dcf44..249a0d3 100644
--- a/src/common.c
+++ b/src/common.c
@@ -1,6 +1,27 @@
 #include "../include/common.h"
+#include <mgl/window/window.h>
+
+static inline float max_float(float a, float b) {
+    return a >= b ? a : b;
+}
+
+static inline float min_float(float a, float b) {
+    return a <= b ? a : b;
+}
 
 bool mgui_rectangle_contains(mgl_vec2f rectangle_pos, mgl_vec2f rectangle_size, mgl_vec2f point) {
     return point.x >= rectangle_pos.x && point.x <= rectangle_pos.x + rectangle_size.x
         && point.y >= rectangle_pos.y && point.y <= rectangle_pos.y + rectangle_size.y;
 }
+
+bool mgui_rectangle_intersects_with_scissor(mgl_vec2i rectangle_pos, mgl_vec2i rectangle_size, mgl_window *window) {
+    mgl_scissor scissor;
+    mgl_window_get_scissor(window, &scissor);
+
+    const int left_x    = max_float(rectangle_pos.x, scissor.position.x);
+    const int right_x   = min_float(rectangle_pos.x + rectangle_size.x, scissor.position.x + scissor.size.x);
+    const int top_y     = max_float(rectangle_pos.y, scissor.position.y);
+    const int bottom_y  = min_float(rectangle_pos.y + rectangle_size.y, scissor.position.y + scissor.size.y);
+
+    return left_x <= right_x && top_y <= bottom_y;
+}