From 3d971b4024680bb345c7cfc147119bd6e2362049 Mon Sep 17 00:00:00 2001
From: Dmitry Sharshakov <d3dx12.xx@gmail.com>
Date: Wed, 9 Nov 2022 08:41:38 +0300
Subject: [PATCH] meson: allow building libcamera from source as a subproject

Many distributions provide outdated libcamera versions. This change should also help making changes to libcamera itself.

System libcamera is kept a default to avoid breaking existing build processes relying to packaged libcamera.
---
 .gitignore                 | 5 +++++
 meson_options.txt          | 2 ++
 spa/meson.build            | 7 ++++++-
 subprojects/libcamera.wrap | 3 +++
 4 files changed, 16 insertions(+), 1 deletion(-)
 create mode 100644 subprojects/libcamera.wrap

diff --git a/.gitignore b/.gitignore
index 57213aa84..2ee6896bb 100644
--- a/.gitignore
+++ b/.gitignore
@@ -15,6 +15,11 @@ subprojects/lua*
 subprojects/wireplumber
 subprojects/media-session
 subprojects/packagecache
+subprojects/googletest*
+subprojects/gtest.wrap
+subprojects/libyaml.wrap
+subprojects/libyaml
+subprojects/libcamera
 
 # Created by https://www.gitignore.io/api/vim
 
diff --git a/meson_options.txt b/meson_options.txt
index 99b057c52..179d019c8 100644
--- a/meson_options.txt
+++ b/meson_options.txt
@@ -168,6 +168,8 @@ option('libcamera',
        description: 'Enable libcamera spa plugin integration',
        type: 'feature',
        value: 'auto')
+option('system-libcamera', type : 'boolean', value : 'true',
+       description : 'Use libcamera from the system instead of building from source')
 option('videoconvert',
        description: 'Enable videoconvert spa plugin integration',
        type: 'feature',
diff --git a/spa/meson.build b/spa/meson.build
index f88b5f9a3..2dbff49a8 100644
--- a/spa/meson.build
+++ b/spa/meson.build
@@ -89,7 +89,12 @@ if get_option('spa-plugins').allowed()
   vulkan_headers = cc.has_header('vulkan/vulkan.h', dependencies : vulkan_dep)
   #summary({'Vulkan': vulkan_headers}, bool_yn: true, section: 'Misc dependencies')
 
-  libcamera_dep = dependency('libcamera', required: get_option('libcamera'))
+  if get_option('system-libcamera')
+    libcamera_dep = dependency('libcamera', required: get_option('libcamera'))
+  else
+    libcamera_proj = subproject('libcamera')
+    libcamera_dep = libcamera_proj.get_variable('libcamera_public')
+  endif
   summary({'libcamera': libcamera_dep.found()}, bool_yn: true, section: 'Backend')
 
   tinycompress_dep = cc.find_library('tinycompress', has_headers: ['tinycompress/tinycompress.h' ], required: get_option('compress-offload'))
diff --git a/subprojects/libcamera.wrap b/subprojects/libcamera.wrap
new file mode 100644
index 000000000..3db743f86
--- /dev/null
+++ b/subprojects/libcamera.wrap
@@ -0,0 +1,3 @@
+[wrap-git]
+url = https://git.libcamera.org/libcamera/libcamera.git
+revision = head