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 <[email protected]>
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 protected]>
Acked-by: Rafael Antognolli <[email protected]>

1 files changed, 15 insertions, 0 deletions

diff --git a/src/intel/tools/imgui/README b/src/intel/tools/imgui/README
new file mode 100644
index 00000000000..138b7620c65
--- /dev/null
+++ b/src/intel/tools/imgui/README
@@ -0,0 +1,15 @@
+Dear ImGui
+==========
+
+This directory contains a copy of the Dear ImGui library at the following commit :
+
+commit 6211f40f3d903dd9df961256e044029c49793aa3
+Author: omar <[email protected]>
+Date:   Fri Jul 27 12:29:33 2018 +0200
+
+Embedding the library into one's project is main way people seems to
+work with ImGui. Since this is just for a debugging tool, we're not
+exposing ourselves too much.
+
+Apart from tweaking the GLEW include path, there is no other
+modification to the files in this directory.