From 0d5746ee7ca337dcc82553ca6dd794b04bb6563d Mon Sep 17 00:00:00 2001
From: Maxim Cournoyer <maxim.cournoyer@gmail.com>
Date: Sat, 1 Apr 2023 10:47:12 -0400
Subject: [PATCH] gnu: imgui: Use unsigned int vertex indexes.

* gnu/packages/toolkits.scm (imgui)
[arguments]: Add the "-DImDrawIdx=unsigned int" compiler option to the build
phase.
---
 gnu/packages/toolkits.scm | 7 ++++++-
 1 file changed, 6 insertions(+), 1 deletion(-)

diff --git a/gnu/packages/toolkits.scm b/gnu/packages/toolkits.scm
index 3030e3aa49..82b9490e62 100644
--- a/gnu/packages/toolkits.scm
+++ b/gnu/packages/toolkits.scm
@@ -66,7 +66,12 @@ (define-public imgui
           (replace 'build
             (lambda* (#:key inputs #:allow-other-keys)
               ;; Build main library.
-              (apply invoke #$(cc-for-target) "-I" (getcwd)
+              (apply invoke #$(cc-for-target)
+                     ;; This option is necessary at least for OpenBoardView,
+                     ;; otherwise it would fail with the "Too many vertices in
+                     ;; ImDrawList using 16-bit indices".
+                     "-DImDrawIdx=unsigned int"
+                     "-I" (getcwd)
                      "-I" (search-input-directory inputs "include/freetype2")
                      "-g" "-O2" "-fPIC" "-shared"
                      "-lGL" "-lSDL2" "-lglfw"