gl-renderer: Add EGL_EXT_partial_update query

Query for the extension itself and the core entrypoint.

Signed-off-by: Daniel Stone <daniels@collabora.com>

libweston/renderer-gl/gl-renderer.c

@@ -233,6 +233,8 @@ struct gl_renderer {
 	bool has_egl_image_external;
 
 	bool has_egl_buffer_age;
+	bool has_egl_partial_update;
+	PFNEGLSETDAMAGEREGIONKHRPROC set_damage_region;
 
 	bool has_configless_context;
 
@@ -3446,6 +3448,8 @@ gl_renderer_setup_egl_extensions(struct weston_compositor *ec)
 		(void *) eglGetProcAddress("eglUnbindWaylandDisplayWL");
 	gr->query_buffer =
 		(void *) eglGetProcAddress("eglQueryWaylandBufferWL");
+	gr->set_damage_region =
+		(void *) eglGetProcAddress("eglSetDamageRegionKHR");
 
 	extensions =
 		(const char *) eglQueryString(gr->egl_display, EGL_EXTENSIONS);
@@ -3468,6 +3472,9 @@ gl_renderer_setup_egl_extensions(struct weston_compositor *ec)
 	if (weston_check_egl_extension(extensions, "EGL_EXT_buffer_age"))
 		gr->has_egl_buffer_age = true;
 
+	if (weston_check_egl_extension(extensions, "EGL_KHR_partial_update"))
+		gr->has_egl_partial_update = true;
+
 	for (i = 0; i < ARRAY_LENGTH(swap_damage_ext_to_entrypoint); i++) {
 		if (weston_check_egl_extension(extensions,
 				swap_damage_ext_to_entrypoint[i].extension)) {