examples: remove dependency on GLES2 for compositor examples

Most of the examples had a GLES2 dependency, but weren't using it.
Convert multi-pointer to wlr_renderer instead of using directly
glClear.

examples/meson.build

@@ -23,11 +23,6 @@ if libavutil.found() and not cc.has_header('libavutil/hwcontext_drm.h', dependen
 	libavutil = disabler()
 endif
 
-wlr_gles2_renderer = []
-if not features['gles2-renderer']
-	wlr_gles2_renderer = disabler()
-endif
-
 compositors = {
 	'simple': {
 		'src': 'simple.c',
@@ -37,23 +32,18 @@ compositors = {
 	},
 	'touch': {
 		'src': ['touch.c', 'cat.c'],
-		'dep': [wlr_gles2_renderer],
 	},
 	'tablet': {
 		'src': 'tablet.c',
-		'dep': [wlr_gles2_renderer],
 	},
 	'rotation': {
 		'src': ['rotation.c', 'cat.c'],
-		'dep': [wlr_gles2_renderer],
 	},
 	'multi-pointer': {
 		'src': 'multi-pointer.c',
-		'dep': [wlr_gles2_renderer],
 	},
 	'output-layout': {
 		'src': ['output-layout.c', 'cat.c'],
-		'dep': [wlr_gles2_renderer],
 	},
 	'fullscreen-shell': {
 		'src': 'fullscreen-shell.c',
@@ -203,7 +193,7 @@ foreach name, info : compositors
 	executable(
 		name,
 		[info.get('src'), extra_src],
-		dependencies: [wlroots, libdrm, info.get('dep', [])],
+		dependencies: [wlroots, libdrm],
 		include_directories: [wlr_inc, proto_inc],
 		build_by_default: get_option('examples'),
 	)

examples/multi-pointer.c

@@ -1,6 +1,5 @@
 #define _POSIX_C_SOURCE 200112L
 #include <assert.h>
-#include <GLES2/gl2.h>
 #include <math.h>
 #include <stdio.h>
 #include <stdlib.h>
@@ -71,7 +70,7 @@ struct sample_keyboard {
 static void configure_cursor(struct wlr_cursor *cursor, struct wlr_input_device *device,
 		 struct sample_state *sample) {
 	struct sample_output *output;
-	wlr_log(WLR_ERROR, "Configuring cursor %p for device %p", cursor, device);
+	wlr_log(WLR_INFO, "Configuring cursor %p for device %p", cursor, device);
 
 	// reset mappings
 	wlr_cursor_map_to_output(cursor, NULL);
@@ -92,14 +91,16 @@ static void output_frame_notify(struct wl_listener *listener, void *data) {
 	struct sample_output *output = wl_container_of(listener, output, frame);
 	struct sample_state *sample = output->sample;
 	struct wlr_output *wlr_output = output->output;
+	struct wlr_renderer *renderer = wlr_backend_get_renderer(wlr_output->backend);
 
 	wlr_output_attach_render(wlr_output, NULL);
 
-	glClearColor(sample->clear_color[0], sample->clear_color[1],
-		sample->clear_color[2], sample->clear_color[3]);
-	glClear(GL_COLOR_BUFFER_BIT);
+	wlr_renderer_begin(renderer, wlr_output->width, wlr_output->height);
+
+	wlr_renderer_clear(renderer, sample->clear_color);
 
 	wlr_output_render_software_cursors(wlr_output, NULL);
+	wlr_renderer_end(renderer);
 	wlr_output_commit(wlr_output);
 }
 

examples/output-layout.c

@@ -1,6 +1,5 @@
 #define _POSIX_C_SOURCE 200112L
 #include <drm_fourcc.h>
-#include <GLES2/gl2.h>
 #include <limits.h>
 #include <math.h>
 #include <stdio.h>

examples/rotation.c

@@ -1,6 +1,5 @@
 #define _POSIX_C_SOURCE 200112L
 #include <drm_fourcc.h>
-#include <GLES2/gl2.h>
 #include <getopt.h>
 #include <math.h>
 #include <stdio.h>

examples/tablet.c

@@ -1,5 +1,4 @@
 #define _XOPEN_SOURCE 600
-#include <GLES2/gl2.h>
 #include <math.h>
 #include <stdio.h>
 #include <stdlib.h>

examples/touch.c

@@ -1,6 +1,5 @@
 #define _POSIX_C_SOURCE 200112L
 #include <drm_fourcc.h>
-#include <GLES2/gl2.h>
 #include <math.h>
 #include <stdint.h>
 #include <stdio.h>