Allow mouse intersection tests to hit any ImGui window

CMakeLists.txt

@@ -797,6 +797,7 @@ list(APPEND ue4poc_SOURCES
 	"src/ue4poc-imgui/imgui_impl_dx11.cpp"
 	"src/ue4poc-imgui/imgui_impl_dx12.cpp"
 	"src/ue4poc-imgui/imgui_impl_win32.cpp"
+	"src/utility/ImGui.cpp"
 	"src/ExceptionHandler.hpp"
 	"src/Framework.hpp"
 	"src/LicenseStrings.hpp"
@@ -835,6 +836,7 @@ list(APPEND ue4poc_SOURCES
 	"src/mods/vr/vtables/IXRTrackingSystemVTables.hpp"
 	"src/ue4poc-imgui/font_robotomedium.hpp"
 	"src/ue4poc-imgui/ue4poc_imconfig.hpp"
+	"src/utility/ImGui.hpp"
 	"src/utility/Logging.hpp"
 	"src/ue4poc-imgui/imgui_impl_dx11.h"
 	"src/ue4poc-imgui/imgui_impl_dx12.h"

src/mods/vr/OverlayComponent.cpp

@@ -3,6 +3,7 @@
 
 #include "Framework.hpp"
 #include "../VR.hpp"
+#include "../utility/ImGui.hpp"
 
 #include "OverlayComponent.hpp"
 
@@ -101,9 +102,7 @@ void OverlayComponent::on_pre_imgui_frame() {
         // lerp towards the intersection point
         last_mouse_pos = glm::lerp(last_mouse_pos, glm::vec2{x, y}, delta_f * 10.0f);
 
-        if (last_mouse_pos.x >= window_pos.x && last_mouse_pos.x <= window_pos.x + window_size.x &&
-            last_mouse_pos.y >= window_pos.y && last_mouse_pos.y <= window_pos.y + window_size.y) 
-        {
+        if (imgui::is_point_intersecting_any(last_mouse_pos.x, last_mouse_pos.y)) {
             io.MousePos = ImVec2{
                 last_mouse_pos.x,
                 last_mouse_pos.y

src/utility/ImGui.cpp

@@ -0,0 +1,34 @@
+#include <imgui.h>
+#include <imgui_internal.h>
+
+#include <glm/vec2.hpp>
+
+#include "ImGui.hpp"
+
+namespace imgui {
+bool is_point_intersecting_any(float x, float y) {
+    const ImGuiIO& io = ImGui::GetIO();
+    const auto ctx = io.Ctx;
+
+    if (ctx == nullptr) {
+        return false;
+    }
+
+    for (int n = 0; n < ctx->Windows.Size; n++) {
+        const auto window = ctx->Windows[n];
+        const auto pos = glm::vec2{window->Pos.x, window->Pos.y};
+        const auto size = glm::vec2{window->Size.x, window->Size.y};
+        const auto mx = pos + size;
+
+        if (window->WasActive && window->Active) {
+            if (x >= window->Pos.x && x <= window->Pos.x + window->Size.x &&
+                y >= window->Pos.y && y <= window->Pos.y + window->Size.y)
+            {
+                return true;
+            }
+        }
+    }
+
+    return false;
+}
+}

src/utility/ImGui.hpp

@@ -0,0 +1,5 @@
+#pragma once
+
+namespace imgui {
+bool is_point_intersecting_any(float x, float y);
+}