vo_opengl: angle: dynamically load ANGLE

ANGLE is _really_ annoying to build. (Requires special toolchain and a
recent MSVC version.) This results in various issues with people
having trouble to build mpv against ANGLE (apparently linking it
against a prebuilt binary doesn't count, or using binaries from
potentially untrusted sources is not wanted).

Dynamically loading ANGLE is going to be a huge convenience. This commit
implements this, with special focus on keeping it source compatible to
a normal build with ANGLE linked at build-time.

1 files changed, 7 insertions, 0 deletions

diff --git a/video/out/opengl/context_angle.c b/video/out/opengl/context_angle.c
index fb2fb4b888..ef498f27eb 100644
--- a/video/out/opengl/context_angle.c
+++ b/video/out/opengl/context_angle.c
@@ -19,6 +19,8 @@
 #include <EGL/egl.h>
 #include <EGL/eglext.h>
 
+#include "angle_dynamic.h"
+
 #include "common/common.h"
 #include "video/out/w32_common.h"
 #include "context.h"
@@ -109,6 +111,11 @@ static int angle_init(struct MPGLContext *ctx, int flags)
     struct priv *p = ctx->priv;
     struct vo *vo = ctx->vo;
 
+    if (!angle_load()) {
+        MP_VERBOSE(vo, "Failed to load LIBEGL.DLL\n");
+        goto fail;
+    }
+
     if (!vo_w32_init(vo))
         goto fail;