commit 6636cb9f2f9dd607a93b8e46a4cb2255703851e3
author omar <omarcornut@gmail.com> Mon May 11 17:29:50 2020 +0200
committer omar <omarcornut@gmail.com> Mon May 11 17:29:50 2020 +0200
tree e96d002a0fae8413346f7daeac141319ffab4a18
parent 1e7672acf46a81e36b3cf35734c015326dd97d58

Viewports: Don't set ImGuiViewportFlags_NoRendererClear when ImGuiWindowFlags_NoBackground is set. (#3213)

imgui.cpp

diff --git a/imgui.cpp b/imgui.cpp
index e1f51a7..db1fb89 100644
--- a/imgui.cpp
+++ b/imgui.cpp
@@ -6236,7 +6236,8 @@
                 UpdateViewportPlatformMonitor(window->Viewport);
 
             // Update common viewport flags
-            ImGuiViewportFlags viewport_flags = (window->Viewport->Flags) & ~(ImGuiViewportFlags_TopMost | ImGuiViewportFlags_NoTaskBarIcon | ImGuiViewportFlags_NoDecoration);
+            const ImGuiViewportFlags viewport_flags_to_clear = ImGuiViewportFlags_TopMost | ImGuiViewportFlags_NoTaskBarIcon | ImGuiViewportFlags_NoDecoration | ImGuiViewportFlags_NoRendererClear;
+            ImGuiViewportFlags viewport_flags = window->Viewport->Flags & ~viewport_flags_to_clear;
             const bool is_short_lived_floating_window = (flags & (ImGuiWindowFlags_ChildMenu | ImGuiWindowFlags_Tooltip | ImGuiWindowFlags_Popup)) != 0;
             if (flags & ImGuiWindowFlags_Tooltip)
                 viewport_flags |= ImGuiViewportFlags_TopMost;
@@ -6266,7 +6267,9 @@
                 viewport_flags &= ~window->WindowClass.ViewportFlagsOverrideClear;
 
             // We also tell the back-end that clearing the platform window won't be necessary, as our window is filling the viewport and we have disabled BgAlpha
-            viewport_flags |= ImGuiViewportFlags_NoRendererClear;
+            if (!(flags & ImGuiWindowFlags_NoBackground))
+                viewport_flags &= ~ImGuiViewportFlags_NoRendererClear;
+
             window->Viewport->Flags = viewport_flags;
         }