vo_opengl: refactor into vo_gpu

This is done in several steps:

1. refactor MPGLContext -> struct ra_ctx
2. move GL-specific stuff in vo_opengl into opengl/context.c
3. generalize context creation to support other APIs, and add --gpu-api
4. rename all of the --opengl- options that are no longer opengl-specific
5. move all of the stuff from opengl/* that isn't GL-specific into gpu/
   (note: opengl/gl_utils.h became opengl/utils.h)
6. rename vo_opengl to vo_gpu
7. to handle window screenshots, the short-term approach was to just add
   it to ra_swchain_fns. Long term (and for vulkan) this has to be moved to
   ra itself (and vo_gpu altered to compensate), but this was a stop-gap
   measure to prevent this commit from getting too big
8. move ra->fns->flush to ra_gl_ctx instead
9. some other minor changes that I've probably already forgotten

Note: This is one half of a major refactor, the other half of which is
provided by rossy's following commit. This commit enables support for
all linux platforms, while his version enables support for all non-linux
platforms.

Note 2: vo_opengl_cb.c also re-uses ra_gl_ctx so it benefits from the
--opengl- options like --opengl-early-flush, --opengl-finish etc. Should
be a strict superset of the old functionality.

Disclaimer: Since I have no way of compiling mpv on all platforms, some
of these ports were done blindly. Specifically, the blind ports included
context_mali_fbdev.c and context_rpi.c. Since they're both based on
egl_helpers, the port should have gone smoothly without any major
changes required. But if somebody complains about a compile error on
those platforms (assuming anybody actually uses them), you know where to
complain.

1 files changed, 25 insertions, 0 deletions

diff --git a/video/out/gpu/osd.h b/video/out/gpu/osd.h
new file mode 100644
index 0000000000..6c2b886de3
--- /dev/null
+++ b/video/out/gpu/osd.h
@@ -0,0 +1,25 @@
+#ifndef MPLAYER_GL_OSD_H
+#define MPLAYER_GL_OSD_H
+
+#include <stdbool.h>
+#include <inttypes.h>
+
+#include "utils.h"
+#include "shader_cache.h"
+#include "sub/osd.h"
+
+struct mpgl_osd *mpgl_osd_init(struct ra *ra, struct mp_log *log,
+                               struct osd_state *osd);
+void mpgl_osd_destroy(struct mpgl_osd *ctx);
+
+void mpgl_osd_generate(struct mpgl_osd *ctx, struct mp_osd_res res, double pts,
+                       int stereo_mode, int draw_flags);
+void mpgl_osd_resize(struct mpgl_osd *ctx, struct mp_osd_res res, int stereo_mode);
+bool mpgl_osd_draw_prepare(struct mpgl_osd *ctx, int index,
+                           struct gl_shader_cache *sc);
+void mpgl_osd_draw_finish(struct mpgl_osd *ctx, int index,
+                          struct gl_shader_cache *sc, struct fbodst target);
+bool mpgl_osd_check_change(struct mpgl_osd *ctx, struct mp_osd_res *res,
+                           double pts);
+
+#endif