mirror of
https://github.com/Drezil/imgui.git
synced 2024-11-14 17:07:01 +00:00
Demo: Demonstrate out-of-order rendering using ImDrawListSplitter.
This commit is contained in:
parent
cf3726bcbc
commit
2b1fc6f765
@ -48,6 +48,7 @@ Other changes:
|
||||
v_max=INT_MAX (#6675, #6679) [@jbarthelmes]
|
||||
- ImDrawList: Fixed OOB access in _CalcCircleAutoSegmentCount when passing excessively
|
||||
large radius to AddCircle(). (#6657, #5317) [@EggsyCRO, @jdpatdiscord]
|
||||
- Demo: Demonstrate out-of-order rendering using ImDrawListSplitter.
|
||||
|
||||
|
||||
-----------------------------------------------------------------------
|
||||
|
2
imgui.h
2
imgui.h
@ -2706,7 +2706,7 @@ struct ImDrawList
|
||||
// Advanced: Channels
|
||||
// - Use to split render into layers. By switching channels to can render out-of-order (e.g. submit FG primitives before BG primitives)
|
||||
// - Use to minimize draw calls (e.g. if going back-and-forth between multiple clipping rectangles, prefer to append into separate channels then merge at the end)
|
||||
// - FIXME-OBSOLETE: This API shouldn't have been in ImDrawList in the first place!
|
||||
// - This API shouldn't have been in ImDrawList in the first place!
|
||||
// Prefer using your own persistent instance of ImDrawListSplitter as you can stack them.
|
||||
// Using the ImDrawList::ChannelsXXXX you cannot stack a split over another.
|
||||
inline void ChannelsSplit(int count) { _Splitter.Split(this, count); }
|
||||
|
@ -7866,6 +7866,43 @@ static void ShowExampleAppCustomRendering(bool* p_open)
|
||||
ImGui::EndTabItem();
|
||||
}
|
||||
|
||||
// Demonstrate out-of-order rendering via channels splitting
|
||||
// We use functions in ImDrawList as each draw list contains a convenience splitter,
|
||||
// but you can also instantiate your own ImDrawListSplitter if you need to nest them.
|
||||
if (ImGui::BeginTabItem("Draw Channels"))
|
||||
{
|
||||
ImDrawList* draw_list = ImGui::GetWindowDrawList();
|
||||
{
|
||||
ImGui::Text("Blue shape is drawn first: appears in back");
|
||||
ImGui::Text("Red shape is drawn after: appears in front");
|
||||
ImVec2 p0 = ImGui::GetCursorScreenPos();
|
||||
draw_list->AddRectFilled(ImVec2(p0.x, p0.y), ImVec2(p0.x + 50, p0.y + 50), IM_COL32(0, 0, 255, 255)); // Blue
|
||||
draw_list->AddRectFilled(ImVec2(p0.x + 25, p0.y + 25), ImVec2(p0.x + 75, p0.y + 75), IM_COL32(255, 0, 0, 255)); // Red
|
||||
ImGui::Dummy(ImVec2(75, 75));
|
||||
}
|
||||
ImGui::Separator();
|
||||
{
|
||||
ImGui::Text("Blue shape is drawn first, into channel 1: appears in front");
|
||||
ImGui::Text("Red shape is drawn after, into channel 0: appears in back");
|
||||
ImVec2 p1 = ImGui::GetCursorScreenPos();
|
||||
|
||||
// Create 2 channels and draw a Blue shape THEN a Red shape.
|
||||
// You can create any number of channels. Tables API use 1 channel per column in order to better batch draw calls.
|
||||
draw_list->ChannelsSplit(2);
|
||||
draw_list->ChannelsSetCurrent(1);
|
||||
draw_list->AddRectFilled(ImVec2(p1.x, p1.y), ImVec2(p1.x + 50, p1.y + 50), IM_COL32(0, 0, 255, 255)); // Blue
|
||||
draw_list->ChannelsSetCurrent(0);
|
||||
draw_list->AddRectFilled(ImVec2(p1.x + 25, p1.y + 25), ImVec2(p1.x + 75, p1.y + 75), IM_COL32(255, 0, 0, 255)); // Red
|
||||
|
||||
// Flatten/reorder channels. Red shape is in channel 0 and it appears below the Blue shape in channel 1.
|
||||
// This works by copying draw indices only (vertices are not copied).
|
||||
draw_list->ChannelsMerge();
|
||||
ImGui::Dummy(ImVec2(75, 75));
|
||||
ImGui::Text("After reordering, contents of channel 0 appears below channel 1.");
|
||||
}
|
||||
ImGui::EndTabItem();
|
||||
}
|
||||
|
||||
ImGui::EndTabBar();
|
||||
}
|
||||
|
||||
|
Loading…
Reference in New Issue
Block a user