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, 2 insertions, 4 deletions

diff --git a/video/out/gl_hwdec_vaglx.c b/video/out/gl_hwdec_vaglx.c
index 555e61aec3..f9dc42911d 100644
--- a/video/out/gl_hwdec_vaglx.c
+++ b/video/out/gl_hwdec_vaglx.c
@@ -58,13 +58,11 @@ static void destroy(struct gl_hwdec *hw)
     struct priv *p = hw->priv;
     destroy_texture(hw);
     va_destroy(p->ctx);
-
-    hw->info->vaapi_ctx = NULL;
 }
 
 static int create(struct gl_hwdec *hw)
 {
-    if (hw->info->vaapi_ctx)
+    if (hw->hwctx)
         return -1;
     Display *x11disp = glXGetCurrentDisplay();
     if (!x11disp)
@@ -84,7 +82,7 @@ static int create(struct gl_hwdec *hw)
         destroy(hw);
         return -1;
     }
-    hw->info->vaapi_ctx = p->ctx;
+    hw->hwctx = &p->ctx->hwctx;
     hw->converted_imgfmt = IMGFMT_RGB0;
     return 0;
 }