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Added GetBackgroundDrawList() helper to quickly get access to a ImDrawList that will be rendered behind every other windows. (#2391)

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This commit is contained in:
omar
2019-03-04 16:10:51 +01:00
parent beb3062dc5
commit 96b13760d4
4 changed files with 25 additions and 4 deletions
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19
imgui.cpp
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@ -874,7 +874,8 @@ CODE
A: - You can create a dummy window. Call Begin() with the NoBackground | NoDecoration | NoSavedSettings | NoInputs flags.
(The ImGuiWindowFlags_NoDecoration flag itself is a shortcut for NoTitleBar | NoResize | NoScrollbar | NoCollapse)
Then you can retrieve the ImDrawList* via GetWindowDrawList() and draw to it in any way you like.
- You can call ImGui::GetOverlayDrawList() and use this draw list to display contents over every other imgui windows.
- You can call ImGui::GetBackgroundDrawList() or ImGui::GetOverlayDrawList() and use those draw list to display contents
behind or over every other imgui windows.
- You can create your own ImDrawList instance. You'll need to initialize them ImGui::GetDrawListSharedData(), or create
your own ImDrawListSharedData, and then call your rendered code with your own ImDrawList or ImDrawData data.
@ -3067,9 +3068,14 @@ int ImGui::GetFrameCount()
return GImGui->FrameCount;
}
ImDrawList* ImGui::GetBackgroundDrawList()
{
return &GImGui->BackgroundDrawList;
}
static ImDrawList* GetOverlayDrawList(ImGuiWindow*)
{
// This seemingly unnecessary wrapper simplifies compatibility between the 'master' and 'viewport' branches.
// This seemingly unnecessary wrapper simplifies compatibility between the 'master' and 'docking' branches.
return &GImGui->OverlayDrawList;
}
@ -3422,6 +3428,11 @@ void ImGui::NewFrame()
g.DrawListSharedData.ClipRectFullscreen = ImVec4(0.0f, 0.0f, g.IO.DisplaySize.x, g.IO.DisplaySize.y);
g.DrawListSharedData.CurveTessellationTol = g.Style.CurveTessellationTol;
g.BackgroundDrawList.Clear();
g.BackgroundDrawList.PushTextureID(g.IO.Fonts->TexID);
g.BackgroundDrawList.PushClipRectFullScreen();
g.BackgroundDrawList.Flags = (g.Style.AntiAliasedLines ? ImDrawListFlags_AntiAliasedLines : 0) | (g.Style.AntiAliasedFill ? ImDrawListFlags_AntiAliasedFill : 0);
g.OverlayDrawList.Clear();
g.OverlayDrawList.PushTextureID(g.IO.Fonts->TexID);
g.OverlayDrawList.PushClipRectFullScreen();
@ -3603,6 +3614,7 @@ void ImGui::Shutdown(ImGuiContext* context)
g.OpenPopupStack.clear();
g.BeginPopupStack.clear();
g.DrawDataBuilder.ClearFreeMemory();
g.BackgroundDrawList.ClearFreeMemory();
g.OverlayDrawList.ClearFreeMemory();
g.PrivateClipboard.clear();
g.InputTextState.ClearFreeMemory();
@ -3860,6 +3872,9 @@ void ImGui::Render()
// Gather ImDrawList to render (for each active window)
g.IO.MetricsRenderVertices = g.IO.MetricsRenderIndices = g.IO.MetricsRenderWindows = 0;
g.DrawDataBuilder.Clear();
if (!g.BackgroundDrawList.VtxBuffer.empty())
AddDrawListToDrawData(&g.DrawDataBuilder.Layers[0], &g.BackgroundDrawList);
ImGuiWindow* windows_to_render_front_most[2];
windows_to_render_front_most[0] = (g.NavWindowingTarget && !(g.NavWindowingTarget->Flags & ImGuiWindowFlags_NoBringToFrontOnFocus)) ? g.NavWindowingTarget->RootWindow : NULL;
windows_to_render_front_most[1] = g.NavWindowingTarget ? g.NavWindowingList : NULL;