gl_common: signal to GL backend whether we are probing

This is supposed to reduce the amount of useless error messages shown
during initialization of vo_opengl. If multiple backends are compiled,
usually only one of them will work. For example, on Linux both X and
Wayland backends can be compiled, but usually either Wayland or X is
running. Then, if Wayland is not running, but X is, trying to initialize
the Wayland backend should not spam the terminal with error messages.

Signed-off-by: Andreas Sinz <andreas.sinz@aon.at>

1 files changed, 7 insertions, 4 deletions

diff --git a/video/out/gl_common.c b/video/out/gl_common.c
index 648d4462e8..48b1089147 100644
--- a/video/out/gl_common.c
+++ b/video/out/gl_common.c
@@ -893,18 +893,21 @@ int mpgl_validate_backend_opt(const struct m_option *opt, struct bstr name,
     return mpgl_find_backend(s) >= -1 ? 1 : M_OPT_INVALID;
 }
 
-static MPGLContext *init_backend(struct vo *vo, MPGLSetBackendFn set_backend)
+static MPGLContext *init_backend(struct vo *vo, MPGLSetBackendFn set_backend,
+                                 bool probing)
 {
     MPGLContext *ctx = talloc_ptrtype(NULL, ctx);
     *ctx = (MPGLContext) {
         .gl = talloc_zero(ctx, GL),
         .vo = vo,
     };
+    vo->probing = probing;
     set_backend(ctx);
     if (!ctx->vo_init(vo)) {
         talloc_free(ctx);
         ctx = NULL;
     }
+    vo->probing = false;
     return ctx;
 }
 
@@ -914,12 +917,12 @@ MPGLContext *mpgl_init(struct vo *vo, const char *backend_name)
     int index = mpgl_find_backend(backend_name);
     if (index == -1) {
         for (const struct backend *entry = backends; entry->name; entry++) {
-            ctx = init_backend(vo, entry->init);
+            ctx = init_backend(vo, entry->init, true);
             if (ctx)
-                return ctx;
+                break;
         }
     } else if (index >= 0) {
-        ctx = init_backend(vo, backends[index].init);
+        ctx = init_backend(vo, backends[index].init, false);
     }
     return ctx;
 }