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Columns: Lower overhead on column switches and switching to background channel (some stress tests in debug builds went 3->2 ms). (#125)

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This change benefits Columns but was primarily made with Tables in mind.
This commit is contained in:
ocornut
2020-06-08 22:38:19 +02:00
parent 84862ec78e
commit 9b3ce494fd
4 changed files with 34 additions and 5 deletions
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29
imgui_widgets.cpp
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@ -7549,6 +7549,11 @@ void ImGui::PushColumnsBackground()
ImGuiColumns* columns = window->DC.CurrentColumns;
if (columns->Count == 1)
return;
// Set cmd header ahead to avoid SetCurrentChannel+PushClipRect doing an unnecessary AddDrawCmd/Pop
//if (window->DrawList->Flags & ImDrawListFlags_Debug) IMGUI_DEBUG_LOG("PushColumnsBackground()\n");
window->DrawList->_CmdHeader.ClipRect = columns->HostClipRect.ToVec4();
columns->Splitter.SetCurrentChannel(window->DrawList, 0);
int cmd_size = window->DrawList->CmdBuffer.Size;
PushClipRect(columns->HostClipRect.Min, columns->HostClipRect.Max, false);
@ -7562,6 +7567,12 @@ void ImGui::PopColumnsBackground()
ImGuiColumns* columns = window->DC.CurrentColumns;
if (columns->Count == 1)
return;
// Set cmd header ahead to avoid SetCurrentChannel+PushClipRect doing an unnecessary AddDrawCmd/Pop
//if (window->DrawList->Flags & ImDrawListFlags_Debug) IMGUI_DEBUG_LOG("PopColumnsBackground()\n");
ImVec4 pop_clip_rect = window->DrawList->_ClipRectStack.Data[window->DrawList->_ClipRectStack.Size - 2];
window->DrawList->_CmdHeader.ClipRect = pop_clip_rect;
columns->Splitter.SetCurrentChannel(window->DrawList, columns->Current + 1);
PopClipRect();
}
@ -7684,11 +7695,22 @@ void ImGui::NextColumn()
return;
}
PopItemWidth();
PopClipRect();
// Next column
if (++columns->Current == columns->Count)
columns->Current = 0;
// As a small optimization, to avoid doing PopClipRect() + SetCurrentChannel() + PushClipRect()
// (which would needlessly attempt to update commands in the wrong channel, then pop or overwrite them),
// We use a shortcut: we override ClipRect in window and drawlist's CmdHeader + SetCurrentChannel().
ImGuiColumnData* column = &columns->Columns[columns->Current];
window->ClipRect = column->ClipRect;
window->DrawList->_CmdHeader.ClipRect = column->ClipRect.ToVec4();
//PopClipRect();
const float column_padding = g.Style.ItemSpacing.x;
columns->LineMaxY = ImMax(columns->LineMaxY, window->DC.CursorPos.y);
if (++columns->Current < columns->Count)
if (columns->Current > 0)
{
// Columns 1+ ignore IndentX (by canceling it out)
// FIXME-COLUMNS: Unnecessary, could be locked?
@ -7701,7 +7723,6 @@ void ImGui::NextColumn()
// Column 0 honor IndentX
window->DC.ColumnsOffset.x = ImMax(column_padding - window->WindowPadding.x, 0.0f);
columns->Splitter.SetCurrentChannel(window->DrawList, 1);
columns->Current = 0;
columns->LineMinY = columns->LineMaxY;
}
window->DC.CursorPos.x = IM_FLOOR(window->Pos.x + window->DC.Indent.x + window->DC.ColumnsOffset.x);
@ -7709,7 +7730,7 @@ void ImGui::NextColumn()
window->DC.CurrLineSize = ImVec2(0.0f, 0.0f);
window->DC.CurrLineTextBaseOffset = 0.0f;
PushColumnClipRect(columns->Current); // FIXME-COLUMNS: Could it be an overwrite?
//PushColumnClipRect(columns->Current);
// FIXME-COLUMNS: Share code with BeginColumns() - move code on columns setup.
float offset_0 = GetColumnOffset(columns->Current);