video/d3d11: add adapter selection by name into d3d11 options

This lets the user define an adapter name that can then be passed
further into the internals.

DOCS/interface-changes.rst

@@ -20,6 +20,8 @@ Interface changes
 ::
 
  --- mpv 0.30.0 ---
+    - add `--d3d11-adapter` to enable explicit selection of a D3D11 rendering
+      adapter by name.
     - rename `--drm-osd-plane-id` to `--drm-draw-plane`, `--drm-video-plane-id` to
       `--drm-drmprime-video-plane` and `--drm-osd-size` to `--drm-draw-surface-size`
       to better reflect what the options actually control, that the values they

DOCS/man/options.rst

@@ -4675,6 +4675,16 @@ The following video options are currently all specific to ``--vo=gpu`` and
     Schedule each frame to be presented for this number of VBlank intervals.
     (default: 1) Setting to 1 will enable VSync, setting to 0 will disable it.
 
+``--d3d11-adapter=<adapter name>``
+    Select a specific D3D11 adapter to utilize for D3D11 rendering.
+    Will pick the default adapter if unset. Alternatives are listed
+    when the d3d11 back-end is initialized with verbosity level verbose
+    or higher.
+
+    Hardware decoders utilizing the D3D11 rendering abstraction's helper
+    functionality to receive a device, such as D3D11VA or DXVA2's DXGI
+    mode, will be affected by this choice.
+
 ``--d3d11va-zero-copy=<yes|no>``
     By default, when using hardware decoding with ``--gpu-api=d3d11``, the
     video image will be copied (GPU-to-GPU) from the decoder surface to a

video/out/d3d11/context.c

@@ -31,6 +31,7 @@ struct d3d11_opts {
     int warp;
     int flip;
     int sync_interval;
+    char *adapter_name;
 };
 
 #define OPT_BASE_STRUCT struct d3d11_opts
@@ -52,6 +53,7 @@ const struct m_sub_options d3d11_conf = {
                     {"9_1", D3D_FEATURE_LEVEL_9_1})),
         OPT_FLAG("d3d11-flip", flip, 0),
         OPT_INTRANGE("d3d11-sync-interval", sync_interval, 0, 0, 4),
+        OPT_STRING("d3d11-adapter", adapter_name, 0),
         {0}
     },
     .defaults = &(const struct d3d11_opts) {
@@ -59,6 +61,7 @@ const struct m_sub_options d3d11_conf = {
         .warp = -1,
         .flip = 1,
         .sync_interval = 1,
+        .adapter_name = NULL,
     },
     .size = sizeof(struct d3d11_opts)
 };