From ac0247a610a5a2ffbb8419a5de02c49fac9b4265 Mon Sep 17 00:00:00 2001
From: Dan Goodliffe <dan@randomdan.homeip.net>
Date: Sat, 27 May 2023 11:47:02 +0100
Subject: Add glad submodule and build a glad library

Slightly messy regarding file paths to get files generated by the glad generator into a place where
b2 will happily find them later... but it works.
---
 .gitmodules            |  3 +++
 Jamroot.jam            |  6 ++++--
 thirdparty/Jamfile.jam |  7 +++++++
 thirdparty/gl.xml      |  1 +
 thirdparty/glad        |  1 +
 thirdparty/glad.jam    | 20 ++++++++++++++++++++
 6 files changed, 36 insertions(+), 2 deletions(-)
 create mode 100644 .gitmodules
 create mode 100644 thirdparty/Jamfile.jam
 create mode 120000 thirdparty/gl.xml
 create mode 160000 thirdparty/glad
 create mode 100644 thirdparty/glad.jam

diff --git a/.gitmodules b/.gitmodules
new file mode 100644
index 0000000..0ce5431
--- /dev/null
+++ b/.gitmodules
@@ -0,0 +1,3 @@
+[submodule "thirdparty/glad"]
+	path = thirdparty/glad
+	url = https://github.com/Dav1dde/glad
diff --git a/Jamroot.jam b/Jamroot.jam
index 95b3135..0273fe2 100644
--- a/Jamroot.jam
+++ b/Jamroot.jam
@@ -58,8 +58,8 @@ always main ;
 run iliketrains : -- : [ sequence.insertion-sort [ glob-tree-ex res : *.* ] ] : : main ;
 
 lib ilt :
-	[ glob-tree *.cpp *.?s *.t?s : application bin test ]
-	[ lib generated : [ glob-tree *.ll *.c ] :
+	[ glob-tree *.cpp *.?s *.t?s : application bin test thirdparty ]
+	[ lib generated : [ glob-tree *.ll *.c : bin thirdparty ] :
 		<include>.
 		<include>lib
 		<link>static
@@ -89,6 +89,8 @@ lib ilt :
 	<toolset>gcc,<variant>debug:<cflags>-Wuseless-cast
 	<include>.
 	<include>lib
+	<library>thirdparty//glad
+	<implicit-dependency>thirdparty//glad
 	<library>sdl2
 	<library>glew
 	<library>freetype2
diff --git a/thirdparty/Jamfile.jam b/thirdparty/Jamfile.jam
new file mode 100644
index 0000000..bee3392
--- /dev/null
+++ b/thirdparty/Jamfile.jam
@@ -0,0 +1,7 @@
+import glad ;
+lib glad : gl.xml :
+	<link>static
+	<cflags>-fPIC
+	<warnings>off
+	<warnings-as-errors>off
+	;
diff --git a/thirdparty/gl.xml b/thirdparty/gl.xml
new file mode 120000
index 0000000..bfea0d8
--- /dev/null
+++ b/thirdparty/gl.xml
@@ -0,0 +1 @@
+glad/glad/files/gl.xml
\ No newline at end of file
diff --git a/thirdparty/glad b/thirdparty/glad
new file mode 160000
index 0000000..2348b07
--- /dev/null
+++ b/thirdparty/glad
@@ -0,0 +1 @@
+Subproject commit 2348b07c1ab4504d60398713781d8a57880234fa
diff --git a/thirdparty/glad.jam b/thirdparty/glad.jam
new file mode 100644
index 0000000..f89750c
--- /dev/null
+++ b/thirdparty/glad.jam
@@ -0,0 +1,20 @@
+import generators : register-standard ;
+import feature : feature ;
+import toolset : flags ;
+
+generators.register-standard glad.generate.c : XML : C(%) H(glad/%) XML ;
+feature glad.pythonpath : thirdparty/glad : path ;
+feature glad.profile : core compatibility ;
+feature glad.version : 4.6 ;
+flags glad.generate.c PYTHONPATH <glad.pythonpath> ;
+flags glad.generate.c PROFILE <glad.profile> ;
+flags glad.generate.c VERSION <glad.version> ;
+
+actions glad.generate.c
+{
+	rm -rf $(1:D)
+	PYTHONPATH=$(PYTHONPATH) python -m glad --api=$(2:B):$(PROFILE)=$(VERSION) --merge --out-path=$(1[3]:D) --reproducible --quiet c
+	mv $(1[3]:D)/src/$(1[1]:BS) $(1[1])
+	mkdir -p $(1[2]:D)
+	mv $(1[3]:D)/include/glad/$(1[2]:BS) $(1[2])
+}
-- 
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