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Tables: sharing splitter and sort buffers between tables, reducing memory footprints. (#3740)

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+ GC pass on that data.
This commit is contained in:
ocornut 2021-05-07 18:29:50 +02:00
parent 32c453ae53
commit 4ce6bd8cff
4 changed files with 42 additions and 21 deletions
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1
docs/CHANGELOG.txt
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@ -50,6 +50,7 @@ Other Changes:
- Nav: Fixed Tabbing initial activation from skipping the first item if it is tabbable through. (#787)
- Tables: Expose TableSetColumnEnabled() in public api. (#3935)
- Tables: Better preserve widths when columns count changes. (#4046)
- Tables: Sharing more memory buffers between tables, reducing general memory footprints. (#3740)
- TabBar: Fixed mouse reordering with very fast movements (e.g. crossing multiple tabs in a single
frame and then immediately standling still (would only affect automation/bots). [@rokups]
- Drags, Sliders, Inputs: Specifying a NULL format to Float functions default them to "%.3f" to be

3
imgui.cpp
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@ -4060,6 +4060,9 @@ void ImGui::NewFrame()
for (int i = 0; i < g.TablesLastTimeActive.Size; i++)
if (g.TablesLastTimeActive[i] >= 0.0f && g.TablesLastTimeActive[i] < memory_compact_start_time)
TableGcCompactTransientBuffers(g.Tables.GetByIndex(i));
for (int i = 0; i < g.TablesTempDataStack.Size; i++)
if (g.TablesTempDataStack[i].LastTimeActive >= 0.0f && g.TablesTempDataStack[i].LastTimeActive < memory_compact_start_time)
TableGcCompactTransientBuffers(&g.TablesTempDataStack[i]);
if (g.GcCompactAll)
GcCompactTransientMiscBuffers();
g.GcCompactAll = false;

17
imgui_internal.h
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@ -2154,9 +2154,7 @@ struct ImGuiTable
ImGuiWindow* OuterWindow; // Parent window for the table
ImGuiWindow* InnerWindow; // Window holding the table data (== OuterWindow or a child window)
ImGuiTextBuffer ColumnsNames; // Contiguous buffer holding columns names
ImDrawListSplitter DrawSplitter; // We carry our own ImDrawList splitter to allow recursion (should move to ImGuiTableTempDataB)
ImGuiTableColumnSortSpecs SortSpecsSingle;
ImVector<ImGuiTableColumnSortSpecs> SortSpecsMulti; // FIXME-OPT: Using a small-vector pattern would be good.
ImDrawListSplitter* DrawSplitter; // Shortcut to TempData->DrawSplitter while in table. Isolate draw commands per columns to avoid switching clip rect constantly
ImGuiTableSortSpecs SortSpecs; // Public facing sorts specs, this is what we return in TableGetSortSpecs()
ImGuiTableColumnIdx SortSpecsCount;
ImGuiTableColumnIdx ColumnsEnabledCount; // Number of enabled columns (<= ColumnsCount)
@ -2203,13 +2201,19 @@ struct ImGuiTable
IMGUI_API ~ImGuiTable() { IM_FREE(RawData); }
};
// Transient data that are only needed between BeginTable() and EndTable(), those buffers are shared.
// Accessing those requires chasing an extra pointer so for very frequently used data we leave them in the main table structure.
// FIXME-TABLE: more transient data could be stored here: DrawSplitter (!), SortSpecs? incoming RowData?
// Transient data that are only needed between BeginTable() and EndTable(), those buffers are shared (1 per level of stacked table).
// - Accessing those requires chasing an extra pointer so for very frequently used data we leave them in the main table structure.
// - We also leave out of this structure data that tend to be particularly useful for debugging/metrics.
// FIXME-TABLE: more transient data could be stored here: DrawSplitter, incoming RowData?
struct ImGuiTableTempData
{
int TableIndex; // Index in g.Tables.Buf[] pool
float LastTimeActive; // Last timestamp this structure was used
ImVec2 UserOuterSize; // outer_size.x passed to BeginTable()
ImDrawListSplitter DrawSplitter;
ImGuiTableColumnSortSpecs SortSpecsSingle;
ImVector<ImGuiTableColumnSortSpecs> SortSpecsMulti; // FIXME-OPT: Using a small-vector pattern would be good.
ImRect HostBackupWorkRect; // Backup of InnerWindow->WorkRect at the end of BeginTable()
ImRect HostBackupParentWorkRect; // Backup of InnerWindow->ParentWorkRect at the end of BeginTable()
@ -2485,6 +2489,7 @@ namespace ImGui
IMGUI_API void TableSetColumnWidthAutoAll(ImGuiTable* table);
IMGUI_API void TableRemove(ImGuiTable* table);
IMGUI_API void TableGcCompactTransientBuffers(ImGuiTable* table);
IMGUI_API void TableGcCompactTransientBuffers(ImGuiTableTempData* table);
IMGUI_API void TableGcCompactSettings();
// Tables: Settings

42
imgui_tables.cpp
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@ -350,6 +350,8 @@ bool ImGui::BeginTableEx(const char* name, ImGuiID id, int columns_count, ImG
g.TablesTempDataStack.resize(g.CurrentTableStackIdx + 1, ImGuiTableTempData());
ImGuiTableTempData* temp_data = table->TempData = &g.TablesTempDataStack[g.CurrentTableStackIdx];
temp_data->TableIndex = table_idx;
table->DrawSplitter = &table->TempData->DrawSplitter;
table->DrawSplitter->Clear();
// Fix flags
table->IsDefaultSizingPolicy = (flags & ImGuiTableFlags_SizingMask_) == 0;
@ -475,6 +477,7 @@ bool ImGui::BeginTableEx(const char* name, ImGuiID id, int columns_count, ImG
if (table_idx >= g.TablesLastTimeActive.Size)
g.TablesLastTimeActive.resize(table_idx + 1, -1.0f);
g.TablesLastTimeActive[table_idx] = (float)g.Time;
temp_data->LastTimeActive = (float)g.Time;
table->MemoryCompacted = false;
// Setup memory buffer (clear data if columns count changed)
@ -1123,7 +1126,7 @@ void ImGui::TableUpdateLayout(ImGuiTable* table)
// Initial state
ImGuiWindow* inner_window = table->InnerWindow;
if (table->Flags & ImGuiTableFlags_NoClip)
table->DrawSplitter.SetCurrentChannel(inner_window->DrawList, TABLE_DRAW_CHANNEL_NOCLIP);
table->DrawSplitter->SetCurrentChannel(inner_window->DrawList, TABLE_DRAW_CHANNEL_NOCLIP);
else
inner_window->DrawList->PushClipRect(inner_window->ClipRect.Min, inner_window->ClipRect.Max, false);
}
@ -1273,7 +1276,7 @@ void ImGui::EndTable()
#endif
// Flatten channels and merge draw calls
ImDrawListSplitter* splitter = &table->DrawSplitter;
ImDrawListSplitter* splitter = table->DrawSplitter;
splitter->SetCurrentChannel(inner_window->DrawList, 0);
if ((table->Flags & ImGuiTableFlags_NoClip) == 0)
TableMergeDrawChannels(table);
@ -1387,7 +1390,10 @@ void ImGui::EndTable()
temp_data = g.CurrentTableStackIdx >= 0 ? &g.TablesTempDataStack[g.CurrentTableStackIdx] : NULL;
g.CurrentTable = temp_data ? g.Tables.GetByIndex(temp_data->TableIndex) : NULL;
if (g.CurrentTable)
{
g.CurrentTable->TempData = temp_data;
g.CurrentTable->DrawSplitter = &temp_data->DrawSplitter;
}
outer_window->DC.CurrentTableIdx = g.CurrentTable ? g.Tables.GetIndex(g.CurrentTable) : -1;
}
@ -1760,7 +1766,7 @@ void ImGui::TableEndRow(ImGuiTable* table)
// always followed by a change of clipping rectangle we perform the smallest overwrite possible here.
if ((table->Flags & ImGuiTableFlags_NoClip) == 0)
window->DrawList->_CmdHeader.ClipRect = table->Bg0ClipRectForDrawCmd.ToVec4();
table->DrawSplitter.SetCurrentChannel(window->DrawList, TABLE_DRAW_CHANNEL_BG0);
table->DrawSplitter->SetCurrentChannel(window->DrawList, TABLE_DRAW_CHANNEL_BG0);
}
// Draw row background
@ -1832,7 +1838,7 @@ void ImGui::TableEndRow(ImGuiTable* table)
// Update cliprect ahead of TableBeginCell() so clipper can access to new ClipRect->Min.y
SetWindowClipRectBeforeSetChannel(window, table->Columns[0].ClipRect);
table->DrawSplitter.SetCurrentChannel(window->DrawList, table->Columns[0].DrawChannelCurrent);
table->DrawSplitter->SetCurrentChannel(window->DrawList, table->Columns[0].DrawChannelCurrent);
}
if (!(table->RowFlags & ImGuiTableRowFlags_Headers))
@ -1947,14 +1953,14 @@ void ImGui::TableBeginCell(ImGuiTable* table, int column_n)
if (table->Flags & ImGuiTableFlags_NoClip)
{
// FIXME: if we end up drawing all borders/bg in EndTable, could remove this and just assert that channel hasn't changed.
table->DrawSplitter.SetCurrentChannel(window->DrawList, TABLE_DRAW_CHANNEL_NOCLIP);
table->DrawSplitter->SetCurrentChannel(window->DrawList, TABLE_DRAW_CHANNEL_NOCLIP);
//IM_ASSERT(table->DrawSplitter._Current == TABLE_DRAW_CHANNEL_NOCLIP);
}
else
{
// FIXME-TABLE: Could avoid this if draw channel is dummy channel?
SetWindowClipRectBeforeSetChannel(window, column->ClipRect);
table->DrawSplitter.SetCurrentChannel(window->DrawList, column->DrawChannelCurrent);
table->DrawSplitter->SetCurrentChannel(window->DrawList, column->DrawChannelCurrent);
}
// Logging
@ -2202,7 +2208,7 @@ void ImGui::TablePushBackgroundChannel()
// Optimization: avoid SetCurrentChannel() + PushClipRect()
table->HostBackupInnerClipRect = window->ClipRect;
SetWindowClipRectBeforeSetChannel(window, table->Bg2ClipRectForDrawCmd);
table->DrawSplitter.SetCurrentChannel(window->DrawList, table->Bg2DrawChannelCurrent);
table->DrawSplitter->SetCurrentChannel(window->DrawList, table->Bg2DrawChannelCurrent);
}
void ImGui::TablePopBackgroundChannel()
@ -2214,7 +2220,7 @@ void ImGui::TablePopBackgroundChannel()
// Optimization: avoid PopClipRect() + SetCurrentChannel()
SetWindowClipRectBeforeSetChannel(window, table->HostBackupInnerClipRect);
table->DrawSplitter.SetCurrentChannel(window->DrawList, column->DrawChannelCurrent);
table->DrawSplitter->SetCurrentChannel(window->DrawList, column->DrawChannelCurrent);
}
// Allocate draw channels. Called by TableUpdateLayout()
@ -2240,7 +2246,7 @@ void ImGui::TableSetupDrawChannels(ImGuiTable* table)
const int channels_for_bg = 1 + 1 * freeze_row_multiplier;
const int channels_for_dummy = (table->ColumnsEnabledCount < table->ColumnsCount || table->VisibleMaskByIndex != table->EnabledMaskByIndex) ? +1 : 0;
const int channels_total = channels_for_bg + (channels_for_row * freeze_row_multiplier) + channels_for_dummy;
table->DrawSplitter.Split(table->InnerWindow->DrawList, channels_total);
table->DrawSplitter->Split(table->InnerWindow->DrawList, channels_total);
table->DummyDrawChannel = (ImGuiTableDrawChannelIdx)((channels_for_dummy > 0) ? channels_total - 1 : -1);
table->Bg2DrawChannelCurrent = TABLE_DRAW_CHANNEL_BG2_FROZEN;
table->Bg2DrawChannelUnfrozen = (ImGuiTableDrawChannelIdx)((table->FreezeRowsCount > 0) ? 2 + channels_for_row : TABLE_DRAW_CHANNEL_BG2_FROZEN);
@ -2304,7 +2310,7 @@ void ImGui::TableSetupDrawChannels(ImGuiTable* table)
void ImGui::TableMergeDrawChannels(ImGuiTable* table)
{
ImGuiContext& g = *GImGui;
ImDrawListSplitter* splitter = &table->DrawSplitter;
ImDrawListSplitter* splitter = table->DrawSplitter;
const bool has_freeze_v = (table->FreezeRowsCount > 0);
const bool has_freeze_h = (table->FreezeColumnsCount > 0);
IM_ASSERT(splitter->_Current == 0);
@ -2475,7 +2481,7 @@ void ImGui::TableDrawBorders(ImGuiTable* table)
return;
ImDrawList* inner_drawlist = inner_window->DrawList;
table->DrawSplitter.SetCurrentChannel(inner_drawlist, TABLE_DRAW_CHANNEL_BG0);
table->DrawSplitter->SetCurrentChannel(inner_drawlist, TABLE_DRAW_CHANNEL_BG0);
inner_drawlist->PushClipRect(table->Bg0ClipRectForDrawCmd.Min, table->Bg0ClipRectForDrawCmd.Max, false);
// Draw inner border and resizing feedback
@ -2735,8 +2741,9 @@ void ImGui::TableSortSpecsBuild(ImGuiTable* table)
TableSortSpecsSanitize(table);
// Write output
table->SortSpecsMulti.resize(table->SortSpecsCount <= 1 ? 0 : table->SortSpecsCount);
ImGuiTableColumnSortSpecs* sort_specs = (table->SortSpecsCount == 0) ? NULL : (table->SortSpecsCount == 1) ? &table->SortSpecsSingle : table->SortSpecsMulti.Data;
ImGuiTableTempData* temp_data = table->TempData;
temp_data->SortSpecsMulti.resize(table->SortSpecsCount <= 1 ? 0 : table->SortSpecsCount);
ImGuiTableColumnSortSpecs* sort_specs = (table->SortSpecsCount == 0) ? NULL : (table->SortSpecsCount == 1) ? &temp_data->SortSpecsSingle : temp_data->SortSpecsMulti.Data;
if (sort_specs != NULL)
for (int column_n = 0; column_n < table->ColumnsCount; column_n++)
{
@ -3434,8 +3441,6 @@ void ImGui::TableGcCompactTransientBuffers(ImGuiTable* table)
//IMGUI_DEBUG_LOG("TableGcCompactTransientBuffers() id=0x%08X\n", table->ID);
ImGuiContext& g = *GImGui;
IM_ASSERT(table->MemoryCompacted == false);
table->DrawSplitter.ClearFreeMemory();
table->SortSpecsMulti.clear();
table->SortSpecs.Specs = NULL;
table->IsSortSpecsDirty = true;
table->ColumnsNames.clear();
@ -3445,6 +3450,13 @@ void ImGui::TableGcCompactTransientBuffers(ImGuiTable* table)
g.TablesLastTimeActive[g.Tables.GetIndex(table)] = -1.0f;
}
void ImGui::TableGcCompactTransientBuffers(ImGuiTableTempData* temp_data)
{
temp_data->DrawSplitter.ClearFreeMemory();
temp_data->SortSpecsMulti.clear();
temp_data->LastTimeActive = -1.0f;
}
// Compact and remove unused settings data (currently only used by TestEngine)
void ImGui::TableGcCompactSettings()
{