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Fixed GetForegroundDrawList()/GetBackgroundDrawList() per-viewport buffers not being collected/ (#9303)

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ocornut
2026-03-18 16:48:18 +01:00
parent 709be8c495
commit 27cacb0e30
3 changed files with 19 additions and 7 deletions
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18
imgui.cpp
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@@ -5198,12 +5198,12 @@ static ImDrawList* GetViewportBgFgDrawList(ImGuiViewportP* viewport, size_t draw
}
// Our ImDrawList system requires that there is always a command
if (viewport->BgFgDrawListsLastFrame[drawlist_no] != g.FrameCount)
if (viewport->BgFgDrawListsLastTimeActive[drawlist_no] != (float)g.Time)
{
draw_list->_ResetForNewFrame();
draw_list->PushTexture(g.IO.Fonts->TexRef);
draw_list->PushClipRect(viewport->Pos, viewport->Pos + viewport->Size, false);
viewport->BgFgDrawListsLastFrame[drawlist_no] = g.FrameCount;
viewport->BgFgDrawListsLastTimeActive[drawlist_no] = (float)g.Time;
}
return draw_list;
}
@@ -6089,7 +6089,7 @@ void ImGui::Render()
for (ImGuiViewportP* viewport : g.Viewports)
{
InitViewportDrawData(viewport);
if (viewport->BgFgDrawLists[0] != NULL)
if (viewport->BgFgDrawLists[0] != NULL && viewport->BgFgDrawListsLastTimeActive[0] == (float)g.Time)
AddDrawListToDrawDataEx(&viewport->DrawDataP, viewport->DrawDataBuilder.Layers[0], GetBackgroundDrawList(viewport));
}
@@ -6121,7 +6121,7 @@ void ImGui::Render()
FlattenDrawDataIntoSingleLayer(&viewport->DrawDataBuilder);
// Add foreground ImDrawList (for each active viewport)
if (viewport->BgFgDrawLists[1] != NULL)
if (viewport->BgFgDrawLists[1] != NULL && viewport->BgFgDrawListsLastTimeActive[1] == (float)g.Time)
AddDrawListToDrawDataEx(&viewport->DrawDataP, viewport->DrawDataBuilder.Layers[0], GetForegroundDrawList(viewport));
// We call _PopUnusedDrawCmd() last thing, as RenderDimmedBackgrounds() rely on a valid command being there (especially in docking branch).
@@ -15821,6 +15821,7 @@ static void ImGui::UpdateViewportsNewFrame()
main_viewport->FramebufferScale = g.IO.DisplayFramebufferScale;
IM_ASSERT(main_viewport->FramebufferScale.x > 0.0f && main_viewport->FramebufferScale.y > 0.0f);
const float memory_compact_start_time = (g.GcCompactAll || g.IO.ConfigMemoryCompactTimer < 0.0f) ? FLT_MAX : (float)g.Time - g.IO.ConfigMemoryCompactTimer;
for (ImGuiViewportP* viewport : g.Viewports)
{
// Lock down space taken by menu bars and status bars
@@ -15829,6 +15830,14 @@ static void ImGui::UpdateViewportsNewFrame()
viewport->WorkInsetMax = viewport->BuildWorkInsetMax;
viewport->BuildWorkInsetMin = viewport->BuildWorkInsetMax = ImVec2(0.0f, 0.0f);
viewport->UpdateWorkRect();
// Garbage collect transient buffers of recently BG/FG drawlists
for (int n = 0; n < IM_COUNTOF(viewport->BgFgDrawLists); n++)
if (viewport->BgFgDrawListsLastTimeActive[n] < memory_compact_start_time && viewport->BgFgDrawLists[n] != NULL)
{
IM_DELETE(viewport->BgFgDrawLists[n]);
viewport->BgFgDrawLists[n] = NULL;
}
}
}
@@ -16867,6 +16876,7 @@ void ImGui::ShowMetricsWindow(bool* p_open)
{
ImGuiDebugAllocInfo* info = &g.DebugAllocInfo;
Text("%d current allocations", info->TotalAllocCount - info->TotalFreeCount);
Text("Releasing selected unused buffers after: %.2f secs", g.IO.ConfigMemoryCompactTimer);
if (SmallButton("GC now")) { g.GcCompactAll = true; }
Text("Recent frames with allocations:");
int buf_size = IM_COUNTOF(info->LastEntriesBuf);