intel: tools: import ImGui
We want to add a new UI tool to decode aub files. This will use the Dear ImGui library to render its interface. The build of this UI toolkit is conditional to -Dwith_tools=intel-ui which superseeds -Dwith_tools=intel. The main way to use ImGui is to embed its source code at a particular revision. Most embedding projects have to do a bit of integration which is really specific to one's project. In our case the only modification is to include libepoxy. We also choose to use Gtk+3 for the window system integration. As oppose to the previous previous version of this patch using GLFW, Gtk+ is able to handle X11/Wayland session as well as property DPI scaling on retina monitors. The import was done at this commit (https://github.com/ocornut/imgui) : commit 6211f40f3d903dd9df961256e044029c49793aa3 Author: omar <firstname.lastname@example.org> Date: Fri Jul 27 12:29:33 2018 +0200 Internals: Drag and Drop: default drop preview use a narrower clipping rectangle (no effect here, but other branches uses a narrow clipping rectangle that was too small so this is a fix for it) + Comments v2: Switch from GLFW to GTK+ (Lionel) Signed-off-by: Lionel Landwerlin <email@example.com> Acked-by: Rafael Antognolli <firstname.lastname@example.org>
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