vo_opengl: add option for caching shaders on disk

Mostly because of ANGLE (sadly).

The implementation became unpleasantly big, but at least it's relatively
self-contained.

I'm not sure to what degree shaders from different drivers are
compatible as in whether a driver would randomly misbehave if it's fed
a binary created by another driver. The useless binayFormat parameter
won't help it, as they can probably easily clash. As usual, OpenGL is
pretty shit here.

1 files changed, 10 insertions, 0 deletions

diff --git a/video/out/opengl/common.c b/video/out/opengl/common.c
index 5762f44440..271214954a 100644
--- a/video/out/opengl/common.c
+++ b/video/out/opengl/common.c
@@ -316,6 +316,16 @@ static const struct gl_functions gl_functions[] = {
             {0}
         },
     },
+    {
+        .ver_core = 410,
+        .ver_es_core = 300,
+        .extension = "GL_ARB_get_program_binary",
+        .functions = (const struct gl_function[]) {
+            DEF_FN(GetProgramBinary),
+            DEF_FN(ProgramBinary),
+            {0}
+        },
+    },
     // Swap control, always an OS specific extension
     // The OSX code loads this manually.
     {