vo_opengl: always autoselect ANGLE as backend if available

Remove the opengl-hq option default that caused it not to autoselect
ANGLE (unlike --vo=opengl). Details see commit d5df90a2.

Back then the intention was to use ANGLE by default, since it integrates
much nicer with the Windows compositor (instead of native OpenGL, which
tends to cause crazy glitches). On the other hand, many opengl-hq
capabilities are not available with older ANGLE builds, so it didn't
make any sense to autoselect ANGLE for it.

With the GL_EXT_texture_norm16 extension recently added to ANGLE, it has
essentially reached feature parity to desktop GL for the subset we are
using. (Even the integer texture hack for high bit depth input could be
dropped now.)

It (probably) still does not support nnedi3, due to the weird way the NN
coefficients are imported. Also, it uses half-floats instead of 16 bit
fixed-point textures for technical reasons, which implies about 5 bits
of precision loss. If anyone actually manages to distinguish the two
dithering texture formats in a double-blind test, I will fix it.

1 files changed, 2 insertions, 2 deletions

diff --git a/DOCS/man/vo.rst b/DOCS/man/vo.rst
index d8c0925744..e3096ab46f 100644
--- a/DOCS/man/vo.rst
+++ b/DOCS/man/vo.rst
@@ -946,8 +946,8 @@ Available video output drivers are:
             Win32/WGL
         angle
             Direct3D11 through the OpenGL ES translation layer ANGLE. This
-            supports almost everything the ``win`` backend does, except ICC
-            profiles, and the ``nnedi3`` prescaler.
+            supports almost everything the ``win`` backend does (if the ANGLE
+            build is new enough), except the ``nnedi3`` prescaler.
         dxinterop (experimental)
             Win32, using WGL for rendering and Direct3D 9Ex for presentation.
             Works on Nvidia and AMD. Newer Intel chips with the latest drivers