options: refactor how --opengl-dcomposition is declared

vo_opengl used to have it as sub-option, which made it very hard to pass
down option values to backends in a generic way (even if these options
were completely backend-specific). For --opengl-dcomposition we used a
VOFLAG to deal with this. Fortunately, sub-options are gone, and we can
just add it as global option.

Move the option to context_angle.c and add it as global option. I
thought about adding a mechanism to let backends declare options, which
would get magically picked up my m_config instead of having to add them
to the global option list manually (similar to VO vo_driver.options),
but decided against this complexity just for 1 or 2 backends. Likewise,
it could have been added as a single option to avoid the boilerplate of
an option struct, but then again there are probably going to be more
angle suboptions, and it's cleaner.

options/options.c

@@ -88,6 +88,8 @@ extern const struct m_obj_list af_obj_list;
 extern const struct m_obj_list vo_obj_list;
 extern const struct m_obj_list ao_obj_list;
 
+extern const struct m_sub_options angle_conf;
+
 const struct m_opt_choice_alternatives mp_hwdec_names[] = {
     {"no",          HWDEC_NONE},
     {"auto",        HWDEC_AUTO},
@@ -691,6 +693,10 @@ const m_option_t mp_opts[] = {
     OPT_SUBSTRUCT("", gl_video_opts, gl_video_conf, 0),
 #endif
 
+#if HAVE_EGL_ANGLE
+    OPT_SUBSTRUCT("", angle_opts, angle_conf, 0),
+#endif
+
 #if HAVE_ENCODING
     OPT_SUBSTRUCT("", encode_opts, encode_config, 0),
 #endif

options/options.h

@@ -320,6 +320,7 @@ typedef struct MPOpts {
     char *input_file;
 
     struct gl_video_opts *gl_video_opts;
+    struct angle_opts *angle_opts;
     struct dvd_opts *dvd_opts;
 } MPOpts;
 

video/out/opengl/context.c

@@ -159,6 +159,7 @@ static MPGLContext *init_backend(struct vo *vo, const struct mpgl_driver *driver
     *ctx = (MPGLContext) {
         .gl = talloc_zero(ctx, GL),
         .vo = vo,
+        .global = vo->global,
         .driver = driver,
     };
     if (probing)

video/out/opengl/context.h

@@ -32,7 +32,6 @@ enum {
     VOFLAG_GL_DEBUG     = 1 << 2,       // Hint to request debug OpenGL context
     VOFLAG_ALPHA        = 1 << 3,       // Hint to request alpha framebuffer
     VOFLAG_SW           = 1 << 4,       // Hint to accept a software GL renderer
-    VOFLAG_ANGLE_DCOMP  = 1 << 5,       // Whether DirectComposition is allowed
     VOFLAG_PROBING      = 1 << 6,       // The backend is being auto-probed.
 };
 
@@ -78,6 +77,7 @@ typedef struct MPGLContext {
     GL *gl;
     struct vo *vo;
     const struct mpgl_driver *driver;
+    struct mpv_global *global;
 
     // For hwdec_vaegl.c.
     const char *native_display_type;

video/out/opengl/context_angle.c

@@ -24,6 +24,7 @@
 #include "angle_dynamic.h"
 
 #include "common/common.h"
+#include "options/m_config.h"
 #include "video/out/w32_common.h"
 #include "context.h"
 
@@ -36,6 +37,22 @@
 // Windows 8 enum value, not present in mingw-w64 headers
 #define DXGI_ADAPTER_FLAG_SOFTWARE (2)
 
+struct angle_opts {
+    int allow_direct_composition;
+};
+
+#define OPT_BASE_STRUCT struct angle_opts
+const struct m_sub_options angle_conf = {
+    .opts = (const struct m_option[]) {
+        OPT_FLAG("opengl-dcomposition", allow_direct_composition, 0),
+        {0}
+    },
+    .defaults = &(const struct angle_opts) {
+        .allow_direct_composition = 1,
+    },
+    .size = sizeof(struct angle_opts),
+};
+
 struct priv {
     EGLDisplay egl_display;
     EGLContext egl_context;
@@ -43,6 +60,7 @@ struct priv {
     bool use_es2;
     bool sw_adapter_msg_shown;
     PFNEGLPOSTSUBBUFFERNVPROC eglPostSubBufferNV;
+    struct angle_opts *opts;
 };
 
 static void angle_uninit(MPGLContext *ctx)
@@ -217,6 +235,8 @@ static int angle_init(struct MPGLContext *ctx, int flags)
     struct priv *p = ctx->priv;
     struct vo *vo = ctx->vo;
 
+    p->opts = mp_get_config_group(ctx, ctx->global, &angle_conf);
+
     if (!angle_load()) {
         MP_VERBOSE(vo, "Failed to load LIBEGL.DLL\n");
         goto fail;
@@ -309,7 +329,7 @@ static int angle_init(struct MPGLContext *ctx, int flags)
     // behavior with some drivers (Intel? symptom - whole desktop is black for
     // some seconds after spending some minutes in fullscreen and then leaving
     // fullscreen).
-    if ((flags & VOFLAG_ANGLE_DCOMP) &&
+    if (p->opts->allow_direct_composition &&
         strstr(exts, "EGL_ANGLE_direct_composition"))
     {
         MP_TARRAY_APPEND(NULL, window_attribs, window_attribs_len,

video/out/vo_opengl.c

@@ -55,7 +55,6 @@ struct vo_opengl_opts {
     int allow_sw;
     int swap_interval;
     int dwm_flush;
-    int allow_direct_composition;
     int vsync_fences;
     char *backend;
     int es;
@@ -383,9 +382,6 @@ static int preinit(struct vo *vo)
     if (p->opts.allow_sw)
         vo_flags |= VOFLAG_SW;
 
-    if (p->opts.allow_direct_composition)
-        vo_flags |= VOFLAG_ANGLE_DCOMP;
-
     p->glctx = mpgl_init(vo, p->opts.backend, vo_flags);
     if (!p->glctx)
         goto err_out;
@@ -444,7 +440,6 @@ const struct vo_driver video_out_opengl = {
         OPT_INT("opengl-swapinterval", opts.swap_interval, 0),
         OPT_CHOICE("opengl-dwmflush", opts.dwm_flush, 0,
                 ({"no", -1}, {"auto", 0}, {"windowed", 1}, {"yes", 2})),
-        OPT_FLAG("opengl-dcomposition", opts.allow_direct_composition, 0),
         OPT_FLAG("opengl-debug", opts.use_gl_debug, 0),
         OPT_STRING_VALIDATE("opengl-backend", opts.backend, 0,
                             mpgl_validate_backend_opt),
@@ -459,7 +454,6 @@ const struct vo_driver video_out_opengl = {
     .priv_defaults = &(const struct gl_priv){
         .opts = {
             .swap_interval = 1,
-            .allow_direct_composition = 1,
         },
     },
 };