Make GLES2 optional

meson.build

@@ -43,6 +43,24 @@ subproject(
 	required: false,
 	version: wlroots_version,
 )
+wlroots = dependency('wlroots', version: wlroots_version)
+wlroots_features = {
+	'xwayland': false,
+	'libinput_backend': false,
+	'gles2_renderer': false,
+	'session': false,
+}
+foreach name, _ : wlroots_features
+	var_name = 'have_' + name.underscorify()
+	have = wlroots.get_variable(pkgconfig: var_name, internal: var_name) == 'true'
+	wlroots_features += { name: have }
+endforeach
+
+if get_option('xwayland').enabled() and not wlroots_features['xwayland']
+	error('Cannot enable Xwayland in sway: wlroots has been built without Xwayland support')
+endif
+
+null_dep = dependency('', required: false)
 
 jsonc = dependency('json-c', version: '>=0.13')
 pcre2 = dependency('libpcre2-8')
@@ -50,14 +68,13 @@ wayland_server = dependency('wayland-server', version: '>=1.21.0')
 wayland_client = dependency('wayland-client')
 wayland_cursor = dependency('wayland-cursor')
 wayland_protos = dependency('wayland-protocols', version: '>=1.24')
-wlroots = dependency('wlroots', version: wlroots_version)
 xkbcommon = dependency('xkbcommon')
 cairo = dependency('cairo')
 pango = dependency('pango')
 pangocairo = dependency('pangocairo')
 gdk_pixbuf = dependency('gdk-pixbuf-2.0', required: get_option('gdk-pixbuf'))
 pixman = dependency('pixman-1')
-glesv2 = dependency('glesv2')
+glesv2 = wlroots_features['gles2_renderer'] ? dependency('glesv2') : null_dep
 libevdev = dependency('libevdev')
 libinput = dependency('libinput', version: '>=1.21.0')
 xcb = dependency('xcb', required: get_option('xwayland'))
@@ -71,18 +88,6 @@ rt = cc.find_library('rt')
 xcb_icccm = dependency('xcb-icccm', required: get_option('xwayland'))
 threads = dependency('threads') # for pthread_setschedparam
 
-wlroots_features = {
-	'xwayland': false,
-}
-foreach name, _ : wlroots_features
-	var_name = 'have_' + name.underscorify()
-	have = wlroots.get_variable(pkgconfig: var_name, internal: var_name) == 'true'
-	wlroots_features += { name: have }
-endforeach
-
-if get_option('xwayland').enabled() and not wlroots_features['xwayland']
-	error('Cannot enable Xwayland in sway: wlroots has been built without Xwayland support')
-endif
 have_xwayland = xcb.found() and wlroots_features['xwayland']
 
 if get_option('sd-bus-provider') == 'auto'

sway/desktop/render.c

@@ -1,11 +1,10 @@
 #define _POSIX_C_SOURCE 200809L
 #include <assert.h>
-#include <GLES2/gl2.h>
 #include <stdlib.h>
 #include <strings.h>
 #include <time.h>
 #include <wayland-server-core.h>
-#include <wlr/render/gles2.h>
+#include <wlr/config.h>
 #include <wlr/render/wlr_renderer.h>
 #include <wlr/types/wlr_buffer.h>
 #include <wlr/types/wlr_damage_ring.h>
@@ -28,6 +27,10 @@
 #include "sway/tree/view.h"
 #include "sway/tree/workspace.h"
 
+#if WLR_HAS_GLES2_RENDERER
+#include <wlr/render/gles2.h>
+#endif
+
 struct render_data {
 	pixman_region32_t *damage;
 	float alpha;
@@ -74,6 +77,7 @@ static void scissor_output(struct wlr_output *wlr_output,
 
 static void set_scale_filter(struct wlr_output *wlr_output,
 		struct wlr_texture *texture, enum scale_filter_mode scale_filter) {
+#if WLR_HAS_GLES2_RENDERER
 	if (!wlr_texture_is_gles2(texture)) {
 		return;
 	}
@@ -94,6 +98,7 @@ static void set_scale_filter(struct wlr_output *wlr_output,
 	case SCALE_FILTER_SMART:
 		assert(false); // unreachable
 	}
+#endif
 }
 
 static void render_texture(struct wlr_output *wlr_output,