video: have a generic context struct for hwdec backends

Before this commit, each hw backend had their own specific struct types
for context, and some, like VDA, had none at all. Add a context struct
(mp_hwdec_ctx) that provides a somewhat generic way to pass the hwdec
context around. Some things get slightly better, some slightly more
verbose.

mp_hwdec_info is still around; it's still needed, but is reduced to its
role of handling delayed loading of the hwdec backend.

1 files changed, 4 insertions, 0 deletions

diff --git a/video/vdpau.c b/video/vdpau.c
index 650f181907..3f7488470c 100644
--- a/video/vdpau.c
+++ b/video/vdpau.c
@@ -302,6 +302,10 @@ struct mp_vdpau_ctx *mp_vdpau_create_device_x11(struct mp_log *log, Display *x11
         .log = log,
         .x11 = x11,
         .preemption_counter = 1,
+        .hwctx = {
+            .priv = ctx,
+            .vdpau_ctx = ctx,
+        },
     };
     mpthread_mutex_init_recursive(&ctx->preempt_lock);
     pthread_mutex_init(&ctx->pool_lock, NULL);