From 0b81a53752dcf17a0b2b8cfe4c106f03edd2fe0e Mon Sep 17 00:00:00 2001
From: David Mohammed <fossfreedom@ubuntu.com>
Date: Tue, 15 Aug 2023 19:56:55 +0100
Subject: [PATCH] meson: add back default_driver option n autotools it was
 possible to pass the --with-default-driver option to force the usage of a
 specific cogl driver at build time.

Expose this functionality in meson as well

Origin: https://gitlab.gnome.org/GNOME/mutter/merge_requests/392
Forwarded: yes
---
 cogl/cogl-config.h.meson | 3 +++
 cogl/meson.build         | 4 ++++
 meson.build              | 3 +++
 meson_options.txt        | 6 ++++++
 4 files changed, 16 insertions(+)

diff --git a/cogl/cogl-config.h.meson b/cogl/cogl-config.h.meson
index 29ca42981f..85fd0c64f3 100644
--- a/cogl/cogl-config.h.meson
+++ b/cogl/cogl-config.h.meson
@@ -10,4 +10,7 @@
 /* Enable unit tests */
 #mesondefine ENABLE_UNIT_TESTS
 
+/* Default COGL driver */
+#mesondefine COGL_DEFAULT_DRIVER
+
 #define COGL_CONFIG_H_INCLUDED 1
diff --git a/cogl/meson.build b/cogl/meson.build
index a87cd18235..6a606482f9 100644
--- a/cogl/meson.build
+++ b/cogl/meson.build
@@ -10,6 +10,10 @@ cdata.set('HAVE_COGL_GLES2', have_gles2)
 cdata.set('HAVE_TRACING', have_profiler)
 cdata.set('ENABLE_UNIT_TESTS', have_cogl_tests)
 
+if default_driver != 'auto'
+  cdata.set_quoted('COGL_DEFAULT_DRIVER', default_driver)
+endif
+
 cogl_config_h = configure_file(
   input: 'cogl-config.h.meson',
   output: 'cogl-config.h',
diff --git a/meson.build b/meson.build
index 2e568d36df..015599d84d 100644
--- a/meson.build
+++ b/meson.build
@@ -273,6 +273,8 @@ if have_wayland_eglstream
   endif
 endif
 
+default_driver = get_option('default_driver')
+
 have_sm = get_option('sm')
 if have_sm
   sm_dep = dependency('sm')
@@ -671,6 +673,7 @@ summary('X11', have_x11, section: 'Options')
 #summary('XWayland', have_xwayland, section: 'Options')
 summary('Native Backend', have_native_backend, section: 'Options')
 summary('EGL Device', have_egl_device, section: 'Options')
+summary('Default driver', default_driver, section: 'Options')
 summary('Remote desktop', have_remote_desktop, section: 'Options')
 summary('libgnome-desktop', have_gnome_desktop, section: 'Options')
 summary('Sound player', have_sound_player, section: 'Options')
diff --git a/meson_options.txt b/meson_options.txt
index f7290f1565..b18f409582 100644
--- a/meson_options.txt
+++ b/meson_options.txt
@@ -230,3 +230,9 @@ option('with_example_wm',
   value: false,
   description: 'Build example window manager'
 )
+
+option('default_driver',
+  type: 'combo',
+  choices: ['auto', 'gl', 'gl3', 'gles2', 'nop'],
+  value: 'auto'
+)