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+;;; GNU Guix --- Functional package management for GNU
+;;; Copyright © 2022 Maxim Cournoyer <maxim.cournoyer@gmail.com>
+;;;
+;;; This file is part of GNU Guix.
+;;;
+;;; GNU Guix is free software; you can redistribute it and/or modify it
+;;; under the terms of the GNU General Public License as published by
+;;; the Free Software Foundation; either version 3 of the License, or (at
+;;; your option) any later version.
+;;;
+;;; GNU Guix is distributed in the hope that it will be useful, but
+;;; WITHOUT ANY WARRANTY; without even the implied warranty of
+;;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+;;; GNU General Public License for more details.
+;;;
+;;; You should have received a copy of the GNU General Public License
+;;; along with GNU Guix. If not, see <http://www.gnu.org/licenses/>.
+
+(define-module (gnu packages toolkits)
+ #:use-module (gnu packages gl)
+ #:use-module (gnu packages sdl)
+ #:use-module ((guix licenses) #:prefix license:)
+ #:use-module (guix packages)
+ #:use-module (guix utils)
+ #:use-module (guix build-system gnu)
+ #:use-module (guix git-download))
+
+(define-public imgui
+ (package
+ (name "imgui")
+ (version "1.86")
+ (source (origin
+ (method git-fetch)
+ (uri (git-reference
+ (url "https://github.com/ocornut/imgui")
+ (commit (string-append "v" version))))
+ (file-name (git-file-name name version))
+ (sha256
+ (base32
+ "02a7b05zrka20jhzag2jb4jl624i1m456bsv69jb9zgys2p9dv1n"))
+ (modules '((guix build utils)))
+ (snippet
+ '(begin
+ ;; Contains fonts and other unneeded files.
+ (delete-file-recursively "misc")))))
+ (outputs '("out" "doc"))
+ (build-system gnu-build-system)
+ (arguments
+ `(#:tests? #f ;no test suite
+ #:modules ((guix build gnu-build-system)
+ (guix build utils)
+ (ice-9 ftw)
+ (srfi srfi-26))
+ #:phases
+ (modify-phases %standard-phases
+ (add-after 'unpack 'adjust-includes
+ (lambda _
+ (substitute* (find-files "." "(\\.cpp|\\.mm)$")
+ (("#include <SDL")
+ "#include <SDL2/SDL"))))
+ (delete 'configure)
+ (replace 'build
+ (lambda _
+ ;; Build main library.
+ (invoke ,(cc-for-target) "-I" (getcwd)
+ "-g" "-O2" "-fPIC" "-shared"
+ "-lGL" "-lSDL2" "-lglfw"
+ "-o" "libimgui.so"
+ "imgui.cpp"
+ "imgui_draw.cpp"
+ ;; Include the supported backends.
+ "backends/imgui_impl_glfw.cpp"
+ "backends/imgui_impl_sdl.cpp"
+ "backends/imgui_impl_opengl2.cpp"
+ "backends/imgui_impl_opengl3.cpp")))
+ (replace 'install
+ (lambda* (#:key outputs #:allow-other-keys)
+ (let* ((out (assoc-ref outputs "out"))
+ (doc (assoc-ref outputs "doc"))
+ (header? (cut string-suffix? ".h" <>))
+ (imgui-headers (scandir "." header?))
+ (backend-headers (find-files
+ "backends"
+ "(glfw|opengl|sdl|vulkan).*\\.h$")))
+ (install-file "libimgui.so" (string-append out "/lib"))
+ ;; Install headers.
+ (for-each (lambda (f)
+ (install-file f (string-append out "/include/imgui")))
+ imgui-headers)
+ (for-each (lambda (f)
+ (install-file f (string-append
+ out "/include/imgui/backends")))
+ backend-headers)
+ ;; Install examples.
+ (copy-recursively
+ "examples" (string-append
+ doc "/share/imgui/examples"))))))))
+ (inputs (list glfw mesa sdl2))
+ (home-page "https://github.com/ocornut/imgui")
+ (synopsis "Graphical user interface library for C++")
+ (description "@code{dear imgui} (also know as ImGui) is a graphical user
+interface library for C++. It outputs vertex buffers that can be rendered in
+a 3D application. It is fast, renderer agnostic and self-contained.")
+ (license license:expat)))