vo_opengl: refactor EGL context information callback

Move the ugliness from x11egl.c to common.c, so that the ugliness
doesn't have to be duplicated in wayland.c.

TOOLS/old-configure

@@ -966,6 +966,7 @@ cat > $TMPC << EOF
 #define HAVE_VIDEOTOOLBOX_GL 0
 #define HAVE_VIDEOTOOLBOX_VDA_GL 0
 #define HAVE_SSE4_INTRINSICS 1
+#define HAVE_C11_TLS 1
 
 #ifdef __OpenBSD__
 #define DEFAULT_CDROM_DEVICE "/dev/rcd0c"

video/out/opengl/common.c

@@ -555,6 +555,29 @@ int mpgl_validate_backend_opt(struct mp_log *log, const struct m_option *opt,
     return mpgl_find_backend(s) >= -1 ? 1 : M_OPT_INVALID;
 }
 
+#if HAVE_C11_TLS
+static _Thread_local MPGLContext *current_context;
+
+static void * GLAPIENTRY get_native_display(const char *name)
+{
+    if (current_context && current_context->native_display_type &&
+        name && strcmp(current_context->native_display_type, name) == 0)
+        return current_context->native_display;
+    return NULL;
+}
+
+static void set_current_context(MPGLContext *context)
+{
+    current_context = context;
+    if (context && !context->gl->MPGetNativeDisplay)
+        context->gl->MPGetNativeDisplay = get_native_display;
+}
+#else
+static void set_current_context(MPGLContext *context)
+{
+}
+#endif
+
 static MPGLContext *init_backend(struct vo *vo, const struct backend *backend,
                                  bool probing, int vo_flags)
 {
@@ -602,6 +625,8 @@ static MPGLContext *init_backend(struct vo *vo, const struct backend *backend,
 
     ctx->gl->debug_context = !!(vo_flags & VOFLAG_GL_DEBUG);
 
+    set_current_context(ctx);
+
     return ctx;
 
 cleanup:
@@ -657,6 +682,7 @@ void mpgl_swap_buffers(struct MPGLContext *ctx)
 
 void mpgl_uninit(MPGLContext *ctx)
 {
+    set_current_context(NULL);
     if (ctx) {
         if (ctx->driver) {
             ctx->driver->uninit(ctx);

video/out/opengl/common.h

@@ -115,6 +115,10 @@ typedef struct MPGLContext {
     // Bit size of each component in the created framebuffer. 0 if unknown.
     int depth_r, depth_g, depth_b;
 
+    // For hwdec_vaegl.c.
+    const char *native_display_type;
+    void *native_display;
+
     // For free use by the mpgl_driver.
     void *priv;
 

video/out/opengl/x11egl.c

@@ -31,21 +31,11 @@
 #include "common.h"
 
 struct priv {
-    Display *x_display;
     EGLDisplay egl_display;
     EGLContext egl_context;
     EGLSurface egl_surface;
 };
 
-static _Thread_local struct priv *current_context;
-
-static void * GLAPIENTRY get_native_display(const char *name)
-{
-    if (current_context && strcmp(name, "x11") == 0)
-        return current_context->x_display;
-    return NULL;
-}
-
 static void mpegl_uninit(MPGLContext *ctx)
 {
     struct priv *p = ctx->priv;
@@ -55,7 +45,6 @@ static void mpegl_uninit(MPGLContext *ctx)
         eglDestroyContext(p->egl_display, p->egl_context);
     }
     p->egl_context = EGL_NO_CONTEXT;
-    current_context = NULL;
     vo_x11_uninit(ctx->vo);
 }
 
@@ -128,8 +117,6 @@ static int mpegl_init(struct MPGLContext *ctx, int flags)
     if (!vo_x11_init(vo))
         goto uninit;
 
-    p->x_display = vo->x11->display;
-
     if (!eglBindAPI(es ? EGL_OPENGL_ES_API : EGL_OPENGL_API)) {
         mp_msg(vo->log, msgl, "Could not bind API (%s).\n", es ? "GLES" : "GL");
         goto uninit;
@@ -166,10 +153,10 @@ static int mpegl_init(struct MPGLContext *ctx, int flags)
 
     void *(*gpa)(const GLubyte*) = (void *(*)(const GLubyte*))eglGetProcAddress;
     mpgl_load_functions(ctx->gl, gpa, egl_exts, vo->log);
-    ctx->gl->MPGetNativeDisplay = get_native_display;
 
-    assert(!current_context);
-    current_context = p;
+    ctx->native_display_type = "x11";
+    ctx->native_display = vo->x11->display;
+
     return true;
 
 uninit:

wscript

@@ -609,7 +609,7 @@ video_output_features = [
     } , {
         'name': '--egl-x11',
         'desc': 'OpenGL X11 EGL Backend',
-        'deps': [ 'x11', 'c11-tls' ],
+        'deps': [ 'x11' ],
         'groups': [ 'gl' ],
         'func': check_pkg_config('egl', 'gl'),
     } , {
@@ -665,6 +665,7 @@ video_output_features = [
     }, {
         'name': 'vaapi-egl',
         'desc': 'VAAPI EGL',
+        'deps': [ 'c11-tls' ], # indirectly
         'deps_any': [ 'vaapi-x-egl' ],
         'func': check_true,
     }, {