vtest: support --render-server

It sets VIRGL_RENDERER_RENDER_SERVER.

Part-of: <https://gitlab.freedesktop.org/virgl/virglrenderer/-/merge_requests/724>

vtest/vtest_server.c

@@ -91,6 +91,7 @@ struct vtest_server
    bool use_gles;
 
    bool venus;
+   bool render_server;
 
    int ctx_flags;
 
@@ -163,6 +164,7 @@ while (__AFL_LOOP(1000)) {
 #define OPT_USE_GLES 'e'
 #define OPT_RENDERNODE 'r'
 #define OPT_VENUS 'v'
+#define OPT_RENDER_SERVER 'n'
 
 static void vtest_server_parse_args(int argc, char **argv)
 {
@@ -177,6 +179,7 @@ static void vtest_server_parse_args(int argc, char **argv)
       {"use-gles",            no_argument, NULL, OPT_USE_GLES},
       {"rendernode",          required_argument, NULL, OPT_RENDERNODE},
       {"venus",               no_argument, NULL, OPT_VENUS},
+      {"render-server",       no_argument, NULL, OPT_RENDER_SERVER},
       {0, 0, 0, 0}
    };
 
@@ -216,6 +219,11 @@ static void vtest_server_parse_args(int argc, char **argv)
       case OPT_VENUS:
          server.venus = true;
          break;
+#endif
+#ifdef ENABLE_RENDER_SERVER
+      case OPT_RENDER_SERVER:
+         server.render_server = true;
+         break;
 #endif
       default:
          printf("Usage: %s [--no-fork] [--no-loop-or-fork] [--multi-clients] "
@@ -223,6 +231,9 @@ static void vtest_server_parse_args(int argc, char **argv)
                 "[--rendernode <dev>]"
 #ifdef ENABLE_VENUS
                 " [--venus]"
+#endif
+#ifdef ENABLE_RENDER_SERVER
+                " [--render-server]"
 #endif
                 " [file]\n", argv[0]);
          exit(EXIT_FAILURE);
@@ -255,6 +266,9 @@ static void vtest_server_parse_args(int argc, char **argv)
    if (server.venus) {
       server.ctx_flags |= VIRGL_RENDERER_VENUS;
    }
+   if (server.render_server) {
+      server.ctx_flags |= VIRGL_RENDERER_RENDER_SERVER;
+   }
 }
 
 static void vtest_server_getenv(void)