command: export current-gpu-context property

This exports `current-gpu-context` property, which is the string
description of the current active GPU context. This allows scripts to
uniquely identify the platform and backend used for --vo=gpu
and --vo=gpu-next.

2 files changed, 4 insertions, 0 deletions

diff --git a/video/out/gpu/context.c b/video/out/gpu/context.c
index 5ce18afbe2..41ec2a4107 100644
--- a/video/out/gpu/context.c
+++ b/video/out/gpu/context.c
@@ -208,6 +208,7 @@ struct ra_ctx *ra_ctx_create(struct vo *vo, struct ra_ctx_opts opts)
         MP_VERBOSE(ctx, "Initializing GPU context '%s'\n", ctx->fns->name);
         if (contexts[i]->init(ctx)) {
             vo->probing = old_probing;
+            vo->context_name = ctx->fns->name;
             return ctx;
         }
 
diff --git a/video/out/vo.h b/video/out/vo.h
index 40c5746992..e9e2f02901 100644
--- a/video/out/vo.h
+++ b/video/out/vo.h
@@ -494,6 +494,9 @@ struct vo {
     int dwidth;
     int dheight;
     float monitor_par;
+
+    // current GPU context (--vo=gpu and --vo=gpu-next only)
+    const char *context_name;
 };
 
 struct mpv_global;