vo_opengl: start work on rendering API abstraction

This starts work on moving OpenGL-specific code out of the general
renderer code, so that we can support other other GPU APIs. This is in
a very early stage and it's only a proof of concept. It's unknown
whether this will succeed or result in other backends.

For now, the GL rendering API ("ra") and its only provider (ra_gl) does
texture creation/upload/destruction only. And it's used for the main
video texture only. All other code is still hardcoded to GL.

There is some duplication with ra_format and gl_format handling. In the
end, only the ra variants will be needed (plus the gl_format table of
course). For now, this is simpler, because for some reason lots of hwdec
code still requires the GL variants, and would have to be updated to
use the ra ones.

Currently, the video.c code accesses private ra_gl fields. In the end,
it should not do that of course, and it would not include ra_gl.h.

Probably adds bugs, but you can keep them.

1 files changed, 7 insertions, 3 deletions

diff --git a/video/out/opengl/formats.h b/video/out/opengl/formats.h
index 5bb3bcb4a3..d4d38c1150 100644
--- a/video/out/opengl/formats.h
+++ b/video/out/opengl/formats.h
@@ -2,8 +2,10 @@
 #define MPGL_FORMATS_H_
 
 #include "common.h"
+#include "ra.h"
 
 struct gl_format {
+    const char *name;           // symbolic name for user interaction/debugging
     GLint internal_format;      // glTexImage argument
     GLenum format;              // glTexImage argument
     GLenum type;                // e.g. GL_UNSIGNED_SHORT
@@ -33,11 +35,13 @@ enum {
                            // the format is still GL_FLOAT (32 bit)
 
     // --- Other constants.
-    MPGL_TYPE_UNORM = 1,    // normalized integer (fixed point) formats
-    MPGL_TYPE_UINT  = 2,    // full integer formats
-    MPGL_TYPE_FLOAT = 3,    // float formats (both full and half)
+    MPGL_TYPE_UNORM = RA_CTYPE_UNORM,   // normalized integer (fixed point) formats
+    MPGL_TYPE_UINT  = RA_CTYPE_UINT,    // full integer formats
+    MPGL_TYPE_FLOAT = RA_CTYPE_FLOAT,   // float formats (both full and half)
 };
 
+extern const struct gl_format gl_formats[];
+
 int gl_format_feature_flags(GL *gl);
 const struct gl_format *gl_find_internal_format(GL *gl, GLint internal_format);
 const struct gl_format *gl_find_format(GL *gl, int type, int flags,