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6cf88dc16c
ImGui drawing code now takes place in the main thread, a snapshot of the render data is created in CMaterialSystem::SwapBuffers(), and is being rendered in the render thread right before SpinPresent(). The reason why this was necessary, is because ConVar::GetString() isn't thread safe if its not marked FCVAR_MATERIAL_SYSTEM_THREAD or FCVAR_ACCESSIBLE_FROM_THREADS, and we used it for the console suggestions window, which iterates over every ConVar, accessible from threads or not.
58 lines
2.1 KiB
C++
58 lines
2.1 KiB
C++
// ImGui snapshot class taken from:
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// https://github.com/ocornut/imgui/issues/1860
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#include "imgui.h"
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#include "imgui_snapshot.h"
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void ImDrawDataSnapshot::Clear()
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{
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for (int n = 0; n < Cache.GetMapSize(); n++)
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if (ImDrawDataSnapshotEntry* entry = Cache.TryGetMapData(n))
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IM_DELETE(entry->OurCopy);
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Cache.Clear();
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DrawData.Clear();
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}
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void ImDrawDataSnapshot::SnapUsingSwap(ImDrawData* src, double current_time)
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{
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ImDrawData* dst = &DrawData;
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IM_ASSERT(src != dst && src->Valid);
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// Copy all fields except CmdLists[]
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ImVector<ImDrawList*> backup_draw_list;
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backup_draw_list.swap(src->CmdLists);
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IM_ASSERT(src->CmdLists.Data == NULL);
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*dst = *src;
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backup_draw_list.swap(src->CmdLists);
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// Swap and mark as used
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for (ImDrawList* src_list : src->CmdLists)
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{
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ImDrawDataSnapshotEntry* entry = GetOrAddEntry(src_list);
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if (entry->OurCopy == NULL)
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{
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entry->SrcCopy = src_list;
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entry->OurCopy = IM_NEW(ImDrawList)(src_list->_Data);
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}
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IM_ASSERT(entry->SrcCopy == src_list);
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entry->SrcCopy->CmdBuffer.swap(entry->OurCopy->CmdBuffer); // Cheap swap
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entry->SrcCopy->IdxBuffer.swap(entry->OurCopy->IdxBuffer);
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entry->SrcCopy->VtxBuffer.swap(entry->OurCopy->VtxBuffer);
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entry->SrcCopy->CmdBuffer.reserve(entry->OurCopy->CmdBuffer.Capacity); // Preserve bigger size to avoid reallocs for two consecutive frames
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entry->SrcCopy->IdxBuffer.reserve(entry->OurCopy->IdxBuffer.Capacity);
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entry->SrcCopy->VtxBuffer.reserve(entry->OurCopy->VtxBuffer.Capacity);
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entry->LastUsedTime = current_time;
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dst->CmdLists.push_back(entry->OurCopy);
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}
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// Cleanup unused data
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const double gc_threshold = current_time - MemoryCompactTimer;
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for (int n = 0; n < Cache.GetMapSize(); n++)
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if (ImDrawDataSnapshotEntry* entry = Cache.TryGetMapData(n))
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{
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if (entry->LastUsedTime > gc_threshold)
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continue;
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IM_DELETE(entry->OurCopy);
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Cache.Remove(GetDrawListID(entry->SrcCopy), entry);
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}
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};
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